import less(1)

[unleashed/tickless.git] / usr / src / lib / libdtrace / common / dt_parser.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2015, Joyent Inc. All rights reserved.
 * Copyright (c) 2012, 2016 by Delphix. All rights reserved.
 */

/*
 * DTrace D Language Parser
 *
 * The D Parser is a lex/yacc parser consisting of the lexer dt_lex.l, the
 * parsing grammar dt_grammar.y, and this file, dt_parser.c, which handles
 * the construction of the parse tree nodes and their syntactic validation.
 * The parse tree is constructed of dt_node_t structures (see <dt_parser.h>)
 * that are built in two passes: (1) the "create" pass, where the parse tree
 * nodes are allocated by calls from the grammar to dt_node_*() subroutines,
 * and (2) the "cook" pass, where nodes are coalesced, assigned D types, and
 * validated according to the syntactic rules of the language.
 *
 * All node allocations are performed using dt_node_alloc().  All node frees
 * during the parsing phase are performed by dt_node_free(), which frees node-
 * internal state but does not actually free the nodes.  All final node frees
 * are done as part of the end of dt_compile() or as part of destroying
 * persistent identifiers or translators which have embedded nodes.
 *
 * The dt_node_* routines that implement pass (1) may allocate new nodes.  The
 * dt_cook_* routines that implement pass (2) may *not* allocate new nodes.
 * They may free existing nodes using dt_node_free(), but they may not actually
 * deallocate any dt_node_t's.  Currently dt_cook_op2() is an exception to this
 * rule: see the comments therein for how this issue is resolved.
 *
 * The dt_cook_* routines are responsible for (at minimum) setting the final
 * node type (dn_ctfp/dn_type) and attributes (dn_attr).  If dn_ctfp/dn_type
 * are set manually (i.e. not by one of the type assignment functions), then
 * the DT_NF_COOKED flag must be set manually on the node.
 *
 * The cooking pass can be applied to the same parse tree more than once (used
 * in the case of a comma-separated list of probe descriptions).  As such, the
 * cook routines must not perform any parse tree transformations which would
 * be invalid if the tree were subsequently cooked using a different context.
 *
 * The dn_ctfp and dn_type fields form the type of the node.  This tuple can
 * take on the following set of values, which form our type invariants:
 *
 * 1. dn_ctfp = NULL, dn_type = CTF_ERR
 *
 *    In this state, the node has unknown type and is not yet cooked.  The
 *    DT_NF_COOKED flag is not yet set on the node.
 *
 * 2. dn_ctfp = DT_DYN_CTFP(dtp), dn_type = DT_DYN_TYPE(dtp)
 *
 *    In this state, the node is a dynamic D type.  This means that generic
 *    operations are not valid on this node and only code that knows how to
 *    examine the inner details of the node can operate on it.  A <DYN> node
 *    must have dn_ident set to point to an identifier describing the object
 *    and its type.  The DT_NF_REF flag is set for all nodes of type <DYN>.
 *    At present, the D compiler uses the <DYN> type for:
 *
 *    - associative arrays that do not yet have a value type defined
 *    - translated data (i.e. the result of the xlate operator)
 *    - aggregations
 *
 * 3. dn_ctfp = DT_STR_CTFP(dtp), dn_type = DT_STR_TYPE(dtp)
 *
 *    In this state, the node is of type D string.  The string type is really
 *    a char[0] typedef, but requires special handling throughout the compiler.
 *
 * 4. dn_ctfp != NULL, dn_type = any other type ID
 *
 *    In this state, the node is of some known D/CTF type.  The normal libctf
 *    APIs can be used to learn more about the type name or structure.  When
 *    the type is assigned, the DT_NF_SIGNED, DT_NF_REF, and DT_NF_BITFIELD
 *    flags cache the corresponding attributes of the underlying CTF type.
 */

#include <sys/param.h>
#include <sys/sysmacros.h>
#include <limits.h>
#include <setjmp.h>
#include <strings.h>
#include <assert.h>
#include <alloca.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>

#include <dt_impl.h>
#include <dt_grammar.h>
#include <dt_module.h>
#include <dt_provider.h>
#include <dt_string.h>
#include <dt_as.h>

dt_pcb_t *yypcb;        /* current control block for parser */
dt_node_t *yypragma;    /* lex token list for control lines */
char yyintprefix;       /* int token macro prefix (+/-) */
char yyintsuffix[4];    /* int token suffix string [uU][lL] */
int yyintdecimal;       /* int token format flag (1=decimal, 0=octal/hex) */

static const char *
opstr(int op)
{
        switch (op) {
        case DT_TOK_COMMA:      return (",");
        case DT_TOK_ELLIPSIS:   return ("...");
        case DT_TOK_ASGN:       return ("=");
        case DT_TOK_ADD_EQ:     return ("+=");
        case DT_TOK_SUB_EQ:     return ("-=");
        case DT_TOK_MUL_EQ:     return ("*=");
        case DT_TOK_DIV_EQ:     return ("/=");
        case DT_TOK_MOD_EQ:     return ("%=");
        case DT_TOK_AND_EQ:     return ("&=");
        case DT_TOK_XOR_EQ:     return ("^=");
        case DT_TOK_OR_EQ:      return ("|=");
        case DT_TOK_LSH_EQ:     return ("<<=");
        case DT_TOK_RSH_EQ:     return (">>=");
        case DT_TOK_QUESTION:   return ("?");
        case DT_TOK_COLON:      return (":");
        case DT_TOK_LOR:        return ("||");
        case DT_TOK_LXOR:       return ("^^");
        case DT_TOK_LAND:       return ("&&");
        case DT_TOK_BOR:        return ("|");
        case DT_TOK_XOR:        return ("^");
        case DT_TOK_BAND:       return ("&");
        case DT_TOK_EQU:        return ("==");
        case DT_TOK_NEQ:        return ("!=");
        case DT_TOK_LT:         return ("<");
        case DT_TOK_LE:         return ("<=");
        case DT_TOK_GT:         return (">");
        case DT_TOK_GE:         return (">=");
        case DT_TOK_LSH:        return ("<<");
        case DT_TOK_RSH:        return (">>");
        case DT_TOK_ADD:        return ("+");
        case DT_TOK_SUB:        return ("-");
        case DT_TOK_MUL:        return ("*");
        case DT_TOK_DIV:        return ("/");
        case DT_TOK_MOD:        return ("%");
        case DT_TOK_LNEG:       return ("!");
        case DT_TOK_BNEG:       return ("~");
        case DT_TOK_ADDADD:     return ("++");
        case DT_TOK_PREINC:     return ("++");
        case DT_TOK_POSTINC:    return ("++");
        case DT_TOK_SUBSUB:     return ("--");
        case DT_TOK_PREDEC:     return ("--");
        case DT_TOK_POSTDEC:    return ("--");
        case DT_TOK_IPOS:       return ("+");
        case DT_TOK_INEG:       return ("-");
        case DT_TOK_DEREF:      return ("*");
        case DT_TOK_ADDROF:     return ("&");
        case DT_TOK_OFFSETOF:   return ("offsetof");
        case DT_TOK_SIZEOF:     return ("sizeof");
        case DT_TOK_STRINGOF:   return ("stringof");
        case DT_TOK_XLATE:      return ("xlate");
        case DT_TOK_LPAR:       return ("(");
        case DT_TOK_RPAR:       return (")");
        case DT_TOK_LBRAC:      return ("[");
        case DT_TOK_RBRAC:      return ("]");
        case DT_TOK_PTR:        return ("->");
        case DT_TOK_DOT:        return (".");
        case DT_TOK_STRING:     return ("<string>");
        case DT_TOK_IDENT:      return ("<ident>");
        case DT_TOK_TNAME:      return ("<type>");
        case DT_TOK_INT:        return ("<int>");
        default:                return ("<?>");
        }
}

int
dt_type_lookup(const char *s, dtrace_typeinfo_t *tip)
{
        static const char delimiters[] = " \t\n\r\v\f*`";
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        const char *p, *q, *r, *end, *obj;

        for (p = s, end = s + strlen(s); *p != '\0'; p = q) {
                while (isspace(*p))
                        p++;    /* skip leading whitespace prior to token */

                if (p == end || (q = strpbrk(p + 1, delimiters)) == NULL)
                        break;  /* empty string or single token remaining */

                if (*q == '`') {
                        char *object = alloca((size_t)(q - p) + 1);
                        char *type = alloca((size_t)(end - s) + 1);

                        /*
                         * Copy from the start of the token (p) to the location
                         * backquote (q) to extract the nul-terminated object.
                         */
                        bcopy(p, object, (size_t)(q - p));
                        object[(size_t)(q - p)] = '\0';

                        /*
                         * Copy the original string up to the start of this
                         * token (p) into type, and then concatenate everything
                         * after q.  This is the type name without the object.
                         */
                        bcopy(s, type, (size_t)(p - s));
                        bcopy(q + 1, type + (size_t)(p - s), strlen(q + 1) + 1);

                        /*
                         * There may be at most three delimeters. The second
                         * delimeter is usually used to distinguish the type
                         * within a given module, however, there could be a link
                         * map id on the scene in which case that delimeter
                         * would be the third. We determine presence of the lmid
                         * if it rouglhly meets the from LM[0-9]
                         */
                        if ((r = strchr(q + 1, '`')) != NULL &&
                            ((r = strchr(r + 1, '`')) != NULL)) {
                                if (strchr(r + 1, '`') != NULL)
                                        return (dt_set_errno(dtp,
                                            EDT_BADSCOPE));
                                if (q[1] != 'L' || q[2] != 'M')
                                        return (dt_set_errno(dtp,
                                            EDT_BADSCOPE));
                        }

                        return (dtrace_lookup_by_type(dtp, object, type, tip));
                }
        }

        if (yypcb->pcb_idepth != 0)
                obj = DTRACE_OBJ_CDEFS;
        else
                obj = DTRACE_OBJ_EVERY;

        return (dtrace_lookup_by_type(dtp, obj, s, tip));
}

/*
 * When we parse type expressions or parse an expression with unary "&", we
 * need to find a type that is a pointer to a previously known type.
 * Unfortunately CTF is limited to a per-container view, so ctf_type_pointer()
 * alone does not suffice for our needs.  We provide a more intelligent wrapper
 * for the compiler that attempts to compute a pointer to either the given type
 * or its base (that is, we try both "foo_t *" and "struct foo *"), and also
 * to potentially construct the required type on-the-fly.
 */
int
dt_type_pointer(dtrace_typeinfo_t *tip)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        ctf_file_t *ctfp = tip->dtt_ctfp;
        ctf_id_t type = tip->dtt_type;
        ctf_id_t base = ctf_type_resolve(ctfp, type);
        uint_t bflags = tip->dtt_flags;

        dt_module_t *dmp;
        ctf_id_t ptr;

        if ((ptr = ctf_type_pointer(ctfp, type)) != CTF_ERR ||
            (ptr = ctf_type_pointer(ctfp, base)) != CTF_ERR) {
                tip->dtt_type = ptr;
                return (0);
        }

        if (yypcb->pcb_idepth != 0)
                dmp = dtp->dt_cdefs;
        else
                dmp = dtp->dt_ddefs;

        if (ctfp != dmp->dm_ctfp && ctfp != ctf_parent_file(dmp->dm_ctfp) &&
            (type = ctf_add_type(dmp->dm_ctfp, ctfp, type)) == CTF_ERR) {
                dtp->dt_ctferr = ctf_errno(dmp->dm_ctfp);
                return (dt_set_errno(dtp, EDT_CTF));
        }

        ptr = ctf_add_pointer(dmp->dm_ctfp, CTF_ADD_ROOT, NULL, type);

        if (ptr == CTF_ERR || ctf_update(dmp->dm_ctfp) == CTF_ERR) {
                dtp->dt_ctferr = ctf_errno(dmp->dm_ctfp);
                return (dt_set_errno(dtp, EDT_CTF));
        }

        tip->dtt_object = dmp->dm_name;
        tip->dtt_ctfp = dmp->dm_ctfp;
        tip->dtt_type = ptr;
        tip->dtt_flags = bflags;

        return (0);
}

const char *
dt_type_name(ctf_file_t *ctfp, ctf_id_t type, char *buf, size_t len)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;

        if (ctfp == DT_FPTR_CTFP(dtp) && type == DT_FPTR_TYPE(dtp))
                (void) snprintf(buf, len, "function pointer");
        else if (ctfp == DT_FUNC_CTFP(dtp) && type == DT_FUNC_TYPE(dtp))
                (void) snprintf(buf, len, "function");
        else if (ctfp == DT_DYN_CTFP(dtp) && type == DT_DYN_TYPE(dtp))
                (void) snprintf(buf, len, "dynamic variable");
        else if (ctfp == NULL)
                (void) snprintf(buf, len, "<none>");
        else if (ctf_type_name(ctfp, type, buf, len) == NULL)
                (void) snprintf(buf, len, "unknown");

        return (buf);
}

/*
 * Perform the "usual arithmetic conversions" to determine which of the two
 * input operand types should be promoted and used as a result type.  The
 * rules for this are described in ISOC[6.3.1.8] and K&R[A6.5].
 */
static void
dt_type_promote(dt_node_t *lp, dt_node_t *rp, ctf_file_t **ofp, ctf_id_t *otype)
{
        ctf_file_t *lfp = lp->dn_ctfp;
        ctf_id_t ltype = lp->dn_type;

        ctf_file_t *rfp = rp->dn_ctfp;
        ctf_id_t rtype = rp->dn_type;

        ctf_id_t lbase = ctf_type_resolve(lfp, ltype);
        uint_t lkind = ctf_type_kind(lfp, lbase);

        ctf_id_t rbase = ctf_type_resolve(rfp, rtype);
        uint_t rkind = ctf_type_kind(rfp, rbase);

        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        ctf_encoding_t le, re;
        uint_t lrank, rrank;

        assert(lkind == CTF_K_INTEGER || lkind == CTF_K_ENUM);
        assert(rkind == CTF_K_INTEGER || rkind == CTF_K_ENUM);

        if (lkind == CTF_K_ENUM) {
                lfp = DT_INT_CTFP(dtp);
                ltype = lbase = DT_INT_TYPE(dtp);
        }

        if (rkind == CTF_K_ENUM) {
                rfp = DT_INT_CTFP(dtp);
                rtype = rbase = DT_INT_TYPE(dtp);
        }

        if (ctf_type_encoding(lfp, lbase, &le) == CTF_ERR) {
                yypcb->pcb_hdl->dt_ctferr = ctf_errno(lfp);
                longjmp(yypcb->pcb_jmpbuf, EDT_CTF);
        }

        if (ctf_type_encoding(rfp, rbase, &re) == CTF_ERR) {
                yypcb->pcb_hdl->dt_ctferr = ctf_errno(rfp);
                longjmp(yypcb->pcb_jmpbuf, EDT_CTF);
        }

        /*
         * Compute an integer rank based on the size and unsigned status.
         * If rank is identical, pick the "larger" of the equivalent types
         * which we define as having a larger base ctf_id_t.  If rank is
         * different, pick the type with the greater rank.
         */
        lrank = le.cte_bits + ((le.cte_format & CTF_INT_SIGNED) == 0);
        rrank = re.cte_bits + ((re.cte_format & CTF_INT_SIGNED) == 0);

        if (lrank == rrank) {
                if (lbase - rbase < 0)
                        goto return_rtype;
                else
                        goto return_ltype;
        } else if (lrank > rrank) {
                goto return_ltype;
        } else
                goto return_rtype;

return_ltype:
        *ofp = lfp;
        *otype = ltype;
        return;

return_rtype:
        *ofp = rfp;
        *otype = rtype;
}

void
dt_node_promote(dt_node_t *lp, dt_node_t *rp, dt_node_t *dnp)
{
        dt_type_promote(lp, rp, &dnp->dn_ctfp, &dnp->dn_type);
        dt_node_type_assign(dnp, dnp->dn_ctfp, dnp->dn_type, B_FALSE);
        dt_node_attr_assign(dnp, dt_attr_min(lp->dn_attr, rp->dn_attr));
}

const char *
dt_node_name(const dt_node_t *dnp, char *buf, size_t len)
{
        char n1[DT_TYPE_NAMELEN];
        char n2[DT_TYPE_NAMELEN];

        const char *prefix = "", *suffix = "";
        const dtrace_syminfo_t *dts;
        char *s;

        switch (dnp->dn_kind) {
        case DT_NODE_INT:
                (void) snprintf(buf, len, "integer constant 0x%llx",
                    (u_longlong_t)dnp->dn_value);
                break;
        case DT_NODE_STRING:
                s = strchr2esc(dnp->dn_string, strlen(dnp->dn_string));
                (void) snprintf(buf, len, "string constant \"%s\"",
                    s != NULL ? s : dnp->dn_string);
                free(s);
                break;
        case DT_NODE_IDENT:
                (void) snprintf(buf, len, "identifier %s", dnp->dn_string);
                break;
        case DT_NODE_VAR:
        case DT_NODE_FUNC:
        case DT_NODE_AGG:
        case DT_NODE_INLINE:
                switch (dnp->dn_ident->di_kind) {
                case DT_IDENT_FUNC:
                case DT_IDENT_AGGFUNC:
                case DT_IDENT_ACTFUNC:
                        suffix = "( )";
                        break;
                case DT_IDENT_AGG:
                        prefix = "@";
                        break;
                }
                (void) snprintf(buf, len, "%s %s%s%s",
                    dt_idkind_name(dnp->dn_ident->di_kind),
                    prefix, dnp->dn_ident->di_name, suffix);
                break;
        case DT_NODE_SYM:
                dts = dnp->dn_ident->di_data;
                (void) snprintf(buf, len, "symbol %s`%s",
                    dts->dts_object, dts->dts_name);
                break;
        case DT_NODE_TYPE:
                (void) snprintf(buf, len, "type %s",
                    dt_node_type_name(dnp, n1, sizeof (n1)));
                break;
        case DT_NODE_OP1:
        case DT_NODE_OP2:
        case DT_NODE_OP3:
                (void) snprintf(buf, len, "operator %s", opstr(dnp->dn_op));
                break;
        case DT_NODE_DEXPR:
        case DT_NODE_DFUNC:
                if (dnp->dn_expr)
                        return (dt_node_name(dnp->dn_expr, buf, len));
                (void) snprintf(buf, len, "%s", "statement");
                break;
        case DT_NODE_PDESC:
                if (dnp->dn_desc->dtpd_id == 0) {
                        (void) snprintf(buf, len,
                            "probe description %s:%s:%s:%s",
                            dnp->dn_desc->dtpd_provider, dnp->dn_desc->dtpd_mod,
                            dnp->dn_desc->dtpd_func, dnp->dn_desc->dtpd_name);
                } else {
                        (void) snprintf(buf, len, "probe description %u",
                            dnp->dn_desc->dtpd_id);
                }
                break;
        case DT_NODE_CLAUSE:
                (void) snprintf(buf, len, "%s", "clause");
                break;
        case DT_NODE_MEMBER:
                (void) snprintf(buf, len, "member %s", dnp->dn_membname);
                break;
        case DT_NODE_XLATOR:
                (void) snprintf(buf, len, "translator <%s> (%s)",
                    dt_type_name(dnp->dn_xlator->dx_dst_ctfp,
                    dnp->dn_xlator->dx_dst_type, n1, sizeof (n1)),
                    dt_type_name(dnp->dn_xlator->dx_src_ctfp,
                    dnp->dn_xlator->dx_src_type, n2, sizeof (n2)));
                break;
        case DT_NODE_PROG:
                (void) snprintf(buf, len, "%s", "program");
                break;
        default:
                (void) snprintf(buf, len, "node <%u>", dnp->dn_kind);
                break;
        }

        return (buf);
}

/*
 * dt_node_xalloc() can be used to create new parse nodes from any libdtrace
 * caller.  The caller is responsible for assigning dn_link appropriately.
 */
dt_node_t *
dt_node_xalloc(dtrace_hdl_t *dtp, int kind)
{
        dt_node_t *dnp = dt_alloc(dtp, sizeof (dt_node_t));

        if (dnp == NULL)
                return (NULL);

        dnp->dn_ctfp = NULL;
        dnp->dn_type = CTF_ERR;
        dnp->dn_kind = (uchar_t)kind;
        dnp->dn_flags = 0;
        dnp->dn_op = 0;
        dnp->dn_line = -1;
        dnp->dn_reg = -1;
        dnp->dn_attr = _dtrace_defattr;
        dnp->dn_list = NULL;
        dnp->dn_link = NULL;
        bzero(&dnp->dn_u, sizeof (dnp->dn_u));

        return (dnp);
}

/*
 * dt_node_alloc() is used to create new parse nodes from the parser.  It
 * assigns the node location based on the current lexer line number and places
 * the new node on the default allocation list.  If allocation fails, we
 * automatically longjmp the caller back to the enclosing compilation call.
 */
static dt_node_t *
dt_node_alloc(int kind)
{
        dt_node_t *dnp = dt_node_xalloc(yypcb->pcb_hdl, kind);

        if (dnp == NULL)
                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

        dnp->dn_line = yylineno;
        dnp->dn_link = yypcb->pcb_list;
        yypcb->pcb_list = dnp;

        return (dnp);
}

void
dt_node_free(dt_node_t *dnp)
{
        uchar_t kind = dnp->dn_kind;

        dnp->dn_kind = DT_NODE_FREE;

        switch (kind) {
        case DT_NODE_STRING:
        case DT_NODE_IDENT:
        case DT_NODE_TYPE:
                free(dnp->dn_string);
                dnp->dn_string = NULL;
                break;

        case DT_NODE_VAR:
        case DT_NODE_FUNC:
        case DT_NODE_PROBE:
                if (dnp->dn_ident != NULL) {
                        if (dnp->dn_ident->di_flags & DT_IDFLG_ORPHAN)
                                dt_ident_destroy(dnp->dn_ident);
                        dnp->dn_ident = NULL;
                }
                dt_node_list_free(&dnp->dn_args);
                break;

        case DT_NODE_OP1:
                if (dnp->dn_child != NULL) {
                        dt_node_free(dnp->dn_child);
                        dnp->dn_child = NULL;
                }
                break;

        case DT_NODE_OP3:
                if (dnp->dn_expr != NULL) {
                        dt_node_free(dnp->dn_expr);
                        dnp->dn_expr = NULL;
                }
                /*FALLTHRU*/
        case DT_NODE_OP2:
                if (dnp->dn_left != NULL) {
                        dt_node_free(dnp->dn_left);
                        dnp->dn_left = NULL;
                }
                if (dnp->dn_right != NULL) {
                        dt_node_free(dnp->dn_right);
                        dnp->dn_right = NULL;
                }
                break;

        case DT_NODE_DEXPR:
        case DT_NODE_DFUNC:
                if (dnp->dn_expr != NULL) {
                        dt_node_free(dnp->dn_expr);
                        dnp->dn_expr = NULL;
                }
                break;

        case DT_NODE_AGG:
                if (dnp->dn_aggfun != NULL) {
                        dt_node_free(dnp->dn_aggfun);
                        dnp->dn_aggfun = NULL;
                }
                dt_node_list_free(&dnp->dn_aggtup);
                break;

        case DT_NODE_PDESC:
                free(dnp->dn_spec);
                dnp->dn_spec = NULL;
                free(dnp->dn_desc);
                dnp->dn_desc = NULL;
                break;

        case DT_NODE_CLAUSE:
                if (dnp->dn_pred != NULL)
                        dt_node_free(dnp->dn_pred);
                if (dnp->dn_locals != NULL)
                        dt_idhash_destroy(dnp->dn_locals);
                dt_node_list_free(&dnp->dn_pdescs);
                dt_node_list_free(&dnp->dn_acts);
                break;

        case DT_NODE_MEMBER:
                free(dnp->dn_membname);
                dnp->dn_membname = NULL;
                if (dnp->dn_membexpr != NULL) {
                        dt_node_free(dnp->dn_membexpr);
                        dnp->dn_membexpr = NULL;
                }
                break;

        case DT_NODE_PROVIDER:
                dt_node_list_free(&dnp->dn_probes);
                free(dnp->dn_provname);
                dnp->dn_provname = NULL;
                break;

        case DT_NODE_PROG:
                dt_node_list_free(&dnp->dn_list);
                break;
        }
}

void
dt_node_attr_assign(dt_node_t *dnp, dtrace_attribute_t attr)
{
        if ((yypcb->pcb_cflags & DTRACE_C_EATTR) &&
            (dt_attr_cmp(attr, yypcb->pcb_amin) < 0)) {
                char a[DTRACE_ATTR2STR_MAX];
                char s[BUFSIZ];

                dnerror(dnp, D_ATTR_MIN, "attributes for %s (%s) are less than "
                    "predefined minimum\n", dt_node_name(dnp, s, sizeof (s)),
                    dtrace_attr2str(attr, a, sizeof (a)));
        }

        dnp->dn_attr = attr;
}

void
dt_node_type_assign(dt_node_t *dnp, ctf_file_t *fp, ctf_id_t type,
    boolean_t user)
{
        ctf_id_t base = ctf_type_resolve(fp, type);
        uint_t kind = ctf_type_kind(fp, base);
        ctf_encoding_t e;

        dnp->dn_flags &=
            ~(DT_NF_SIGNED | DT_NF_REF | DT_NF_BITFIELD | DT_NF_USERLAND);

        if (kind == CTF_K_INTEGER && ctf_type_encoding(fp, base, &e) == 0) {
                size_t size = e.cte_bits / NBBY;

                if (size > 8 || (e.cte_bits % NBBY) != 0 || (size & (size - 1)))
                        dnp->dn_flags |= DT_NF_BITFIELD;

                if (e.cte_format & CTF_INT_SIGNED)
                        dnp->dn_flags |= DT_NF_SIGNED;
        }

        if (kind == CTF_K_FLOAT && ctf_type_encoding(fp, base, &e) == 0) {
                if (e.cte_bits / NBBY > sizeof (uint64_t))
                        dnp->dn_flags |= DT_NF_REF;
        }

        if (kind == CTF_K_STRUCT || kind == CTF_K_UNION ||
            kind == CTF_K_FORWARD ||
            kind == CTF_K_ARRAY || kind == CTF_K_FUNCTION)
                dnp->dn_flags |= DT_NF_REF;
        else if (yypcb != NULL && fp == DT_DYN_CTFP(yypcb->pcb_hdl) &&
            type == DT_DYN_TYPE(yypcb->pcb_hdl))
                dnp->dn_flags |= DT_NF_REF;

        if (user)
                dnp->dn_flags |= DT_NF_USERLAND;

        dnp->dn_flags |= DT_NF_COOKED;
        dnp->dn_ctfp = fp;
        dnp->dn_type = type;
}

void
dt_node_type_propagate(const dt_node_t *src, dt_node_t *dst)
{
        assert(src->dn_flags & DT_NF_COOKED);
        dst->dn_flags = src->dn_flags & ~DT_NF_LVALUE;
        dst->dn_ctfp = src->dn_ctfp;
        dst->dn_type = src->dn_type;
}

const char *
dt_node_type_name(const dt_node_t *dnp, char *buf, size_t len)
{
        if (dt_node_is_dynamic(dnp) && dnp->dn_ident != NULL) {
                (void) snprintf(buf, len, "%s",
                    dt_idkind_name(dt_ident_resolve(dnp->dn_ident)->di_kind));
                return (buf);
        }

        if (dnp->dn_flags & DT_NF_USERLAND) {
                size_t n = snprintf(buf, len, "userland ");
                len = len > n ? len - n : 0;
                (void) dt_type_name(dnp->dn_ctfp, dnp->dn_type, buf + n, len);
                return (buf);
        }

        return (dt_type_name(dnp->dn_ctfp, dnp->dn_type, buf, len));
}

size_t
dt_node_type_size(const dt_node_t *dnp)
{
        ctf_id_t base;
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;

        if (dnp->dn_kind == DT_NODE_STRING)
                return (strlen(dnp->dn_string) + 1);

        if (dt_node_is_dynamic(dnp) && dnp->dn_ident != NULL)
                return (dt_ident_size(dnp->dn_ident));

        base = ctf_type_resolve(dnp->dn_ctfp, dnp->dn_type);

        if (ctf_type_kind(dnp->dn_ctfp, base) == CTF_K_FORWARD)
                return (0);

        /*
         * Here we have a 32-bit user pointer that is being used with a 64-bit
         * kernel. When we're using it and its tagged as a userland reference --
         * then we need to keep it as a 32-bit pointer. However, if we are
         * referring to it as a kernel address, eg. being used after a copyin()
         * then we need to make sure that we actually return the kernel's size
         * of a pointer, 8 bytes.
         */
        if (ctf_type_kind(dnp->dn_ctfp, base) == CTF_K_POINTER &&
            ctf_getmodel(dnp->dn_ctfp) == CTF_MODEL_ILP32 &&
            !(dnp->dn_flags & DT_NF_USERLAND) &&
            dtp->dt_conf.dtc_ctfmodel == CTF_MODEL_LP64)
                        return (8);

        return (ctf_type_size(dnp->dn_ctfp, dnp->dn_type));
}

/*
 * Determine if the specified parse tree node references an identifier of the
 * specified kind, and if so return a pointer to it; otherwise return NULL.
 * This function resolves the identifier itself, following through any inlines.
 */
dt_ident_t *
dt_node_resolve(const dt_node_t *dnp, uint_t idkind)
{
        dt_ident_t *idp;

        switch (dnp->dn_kind) {
        case DT_NODE_VAR:
        case DT_NODE_SYM:
        case DT_NODE_FUNC:
        case DT_NODE_AGG:
        case DT_NODE_INLINE:
        case DT_NODE_PROBE:
                idp = dt_ident_resolve(dnp->dn_ident);
                return (idp->di_kind == idkind ? idp : NULL);
        }

        if (dt_node_is_dynamic(dnp)) {
                idp = dt_ident_resolve(dnp->dn_ident);
                return (idp->di_kind == idkind ? idp : NULL);
        }

        return (NULL);
}

size_t
dt_node_sizeof(const dt_node_t *dnp)
{
        dtrace_syminfo_t *sip;
        GElf_Sym sym;
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;

        /*
         * The size of the node as used for the sizeof() operator depends on
         * the kind of the node.  If the node is a SYM, the size is obtained
         * from the symbol table; if it is not a SYM, the size is determined
         * from the node's type.  This is slightly different from C's sizeof()
         * operator in that (for example) when applied to a function, sizeof()
         * will evaluate to the length of the function rather than the size of
         * the function type.
         */
        if (dnp->dn_kind != DT_NODE_SYM)
                return (dt_node_type_size(dnp));

        sip = dnp->dn_ident->di_data;

        if (dtrace_lookup_by_name(dtp, sip->dts_object,
            sip->dts_name, &sym, NULL) == -1)
                return (0);

        return (sym.st_size);
}

int
dt_node_is_integer(const dt_node_t *dnp)
{
        ctf_file_t *fp = dnp->dn_ctfp;
        ctf_encoding_t e;
        ctf_id_t type;
        uint_t kind;

        assert(dnp->dn_flags & DT_NF_COOKED);

        type = ctf_type_resolve(fp, dnp->dn_type);
        kind = ctf_type_kind(fp, type);

        if (kind == CTF_K_INTEGER &&
            ctf_type_encoding(fp, type, &e) == 0 && IS_VOID(e))
                return (0); /* void integer */

        return (kind == CTF_K_INTEGER || kind == CTF_K_ENUM);
}

int
dt_node_is_float(const dt_node_t *dnp)
{
        ctf_file_t *fp = dnp->dn_ctfp;
        ctf_encoding_t e;
        ctf_id_t type;
        uint_t kind;

        assert(dnp->dn_flags & DT_NF_COOKED);

        type = ctf_type_resolve(fp, dnp->dn_type);
        kind = ctf_type_kind(fp, type);

        return (kind == CTF_K_FLOAT &&
            ctf_type_encoding(dnp->dn_ctfp, type, &e) == 0 && (
            e.cte_format == CTF_FP_SINGLE || e.cte_format == CTF_FP_DOUBLE ||
            e.cte_format == CTF_FP_LDOUBLE));
}

int
dt_node_is_scalar(const dt_node_t *dnp)
{
        ctf_file_t *fp = dnp->dn_ctfp;
        ctf_encoding_t e;
        ctf_id_t type;
        uint_t kind;

        assert(dnp->dn_flags & DT_NF_COOKED);

        type = ctf_type_resolve(fp, dnp->dn_type);
        kind = ctf_type_kind(fp, type);

        if (kind == CTF_K_INTEGER &&
            ctf_type_encoding(fp, type, &e) == 0 && IS_VOID(e))
                return (0); /* void cannot be used as a scalar */

        return (kind == CTF_K_INTEGER || kind == CTF_K_ENUM ||
            kind == CTF_K_POINTER);
}

int
dt_node_is_arith(const dt_node_t *dnp)
{
        ctf_file_t *fp = dnp->dn_ctfp;
        ctf_encoding_t e;
        ctf_id_t type;
        uint_t kind;

        assert(dnp->dn_flags & DT_NF_COOKED);

        type = ctf_type_resolve(fp, dnp->dn_type);
        kind = ctf_type_kind(fp, type);

        if (kind == CTF_K_INTEGER)
                return (ctf_type_encoding(fp, type, &e) == 0 && !IS_VOID(e));
        else
                return (kind == CTF_K_ENUM);
}

int
dt_node_is_vfptr(const dt_node_t *dnp)
{
        ctf_file_t *fp = dnp->dn_ctfp;
        ctf_encoding_t e;
        ctf_id_t type;
        uint_t kind;

        assert(dnp->dn_flags & DT_NF_COOKED);

        type = ctf_type_resolve(fp, dnp->dn_type);
        if (ctf_type_kind(fp, type) != CTF_K_POINTER)
                return (0); /* type is not a pointer */

        type = ctf_type_resolve(fp, ctf_type_reference(fp, type));
        kind = ctf_type_kind(fp, type);

        return (kind == CTF_K_FUNCTION || (kind == CTF_K_INTEGER &&
            ctf_type_encoding(fp, type, &e) == 0 && IS_VOID(e)));
}

int
dt_node_is_dynamic(const dt_node_t *dnp)
{
        if (dnp->dn_kind == DT_NODE_VAR &&
            (dnp->dn_ident->di_flags & DT_IDFLG_INLINE)) {
                const dt_idnode_t *inp = dnp->dn_ident->di_iarg;
                return (inp->din_root ? dt_node_is_dynamic(inp->din_root) : 0);
        }

        return (dnp->dn_ctfp == DT_DYN_CTFP(yypcb->pcb_hdl) &&
            dnp->dn_type == DT_DYN_TYPE(yypcb->pcb_hdl));
}

int
dt_node_is_string(const dt_node_t *dnp)
{
        return (dnp->dn_ctfp == DT_STR_CTFP(yypcb->pcb_hdl) &&
            dnp->dn_type == DT_STR_TYPE(yypcb->pcb_hdl));
}

int
dt_node_is_stack(const dt_node_t *dnp)
{
        return (dnp->dn_ctfp == DT_STACK_CTFP(yypcb->pcb_hdl) &&
            dnp->dn_type == DT_STACK_TYPE(yypcb->pcb_hdl));
}

int
dt_node_is_symaddr(const dt_node_t *dnp)
{
        return (dnp->dn_ctfp == DT_SYMADDR_CTFP(yypcb->pcb_hdl) &&
            dnp->dn_type == DT_SYMADDR_TYPE(yypcb->pcb_hdl));
}

int
dt_node_is_usymaddr(const dt_node_t *dnp)
{
        return (dnp->dn_ctfp == DT_USYMADDR_CTFP(yypcb->pcb_hdl) &&
            dnp->dn_type == DT_USYMADDR_TYPE(yypcb->pcb_hdl));
}

int
dt_node_is_strcompat(const dt_node_t *dnp)
{
        ctf_file_t *fp = dnp->dn_ctfp;
        ctf_encoding_t e;
        ctf_arinfo_t r;
        ctf_id_t base;
        uint_t kind;

        assert(dnp->dn_flags & DT_NF_COOKED);

        base = ctf_type_resolve(fp, dnp->dn_type);
        kind = ctf_type_kind(fp, base);

        if (kind == CTF_K_POINTER &&
            (base = ctf_type_reference(fp, base)) != CTF_ERR &&
            (base = ctf_type_resolve(fp, base)) != CTF_ERR &&
            ctf_type_encoding(fp, base, &e) == 0 && IS_CHAR(e))
                return (1); /* promote char pointer to string */

        if (kind == CTF_K_ARRAY && ctf_array_info(fp, base, &r) == 0 &&
            (base = ctf_type_resolve(fp, r.ctr_contents)) != CTF_ERR &&
            ctf_type_encoding(fp, base, &e) == 0 && IS_CHAR(e))
                return (1); /* promote char array to string */

        return (0);
}

int
dt_node_is_pointer(const dt_node_t *dnp)
{
        ctf_file_t *fp = dnp->dn_ctfp;
        uint_t kind;

        assert(dnp->dn_flags & DT_NF_COOKED);

        if (dt_node_is_string(dnp))
                return (0); /* string are pass-by-ref but act like structs */

        kind = ctf_type_kind(fp, ctf_type_resolve(fp, dnp->dn_type));
        return (kind == CTF_K_POINTER || kind == CTF_K_ARRAY);
}

int
dt_node_is_void(const dt_node_t *dnp)
{
        ctf_file_t *fp = dnp->dn_ctfp;
        ctf_encoding_t e;
        ctf_id_t type;

        if (dt_node_is_dynamic(dnp))
                return (0); /* <DYN> is an alias for void but not the same */

        if (dt_node_is_stack(dnp))
                return (0);

        if (dt_node_is_symaddr(dnp) || dt_node_is_usymaddr(dnp))
                return (0);

        type = ctf_type_resolve(fp, dnp->dn_type);

        return (ctf_type_kind(fp, type) == CTF_K_INTEGER &&
            ctf_type_encoding(fp, type, &e) == 0 && IS_VOID(e));
}

int
dt_node_is_ptrcompat(const dt_node_t *lp, const dt_node_t *rp,
    ctf_file_t **fpp, ctf_id_t *tp)
{
        ctf_file_t *lfp = lp->dn_ctfp;
        ctf_file_t *rfp = rp->dn_ctfp;

        ctf_id_t lbase = CTF_ERR, rbase = CTF_ERR;
        ctf_id_t lref = CTF_ERR, rref = CTF_ERR;

        int lp_is_void, rp_is_void, lp_is_int, rp_is_int, compat;
        uint_t lkind, rkind;
        ctf_encoding_t e;
        ctf_arinfo_t r;

        assert(lp->dn_flags & DT_NF_COOKED);
        assert(rp->dn_flags & DT_NF_COOKED);

        if (dt_node_is_dynamic(lp) || dt_node_is_dynamic(rp))
                return (0); /* fail if either node is a dynamic variable */

        lp_is_int = dt_node_is_integer(lp);
        rp_is_int = dt_node_is_integer(rp);

        if (lp_is_int && rp_is_int)
                return (0); /* fail if both nodes are integers */

        if (lp_is_int && (lp->dn_kind != DT_NODE_INT || lp->dn_value != 0))
                return (0); /* fail if lp is an integer that isn't 0 constant */

        if (rp_is_int && (rp->dn_kind != DT_NODE_INT || rp->dn_value != 0))
                return (0); /* fail if rp is an integer that isn't 0 constant */

        if ((lp_is_int == 0 && rp_is_int == 0) && (
            (lp->dn_flags & DT_NF_USERLAND) ^ (rp->dn_flags & DT_NF_USERLAND)))
                return (0); /* fail if only one pointer is a userland address */

        /*
         * Resolve the left-hand and right-hand types to their base type, and
         * then resolve the referenced type as well (assuming the base type
         * is CTF_K_POINTER or CTF_K_ARRAY).  Otherwise [lr]ref = CTF_ERR.
         */
        if (!lp_is_int) {
                lbase = ctf_type_resolve(lfp, lp->dn_type);
                lkind = ctf_type_kind(lfp, lbase);

                if (lkind == CTF_K_POINTER) {
                        lref = ctf_type_resolve(lfp,
                            ctf_type_reference(lfp, lbase));
                } else if (lkind == CTF_K_ARRAY &&
                    ctf_array_info(lfp, lbase, &r) == 0) {
                        lref = ctf_type_resolve(lfp, r.ctr_contents);
                }
        }

        if (!rp_is_int) {
                rbase = ctf_type_resolve(rfp, rp->dn_type);
                rkind = ctf_type_kind(rfp, rbase);

                if (rkind == CTF_K_POINTER) {
                        rref = ctf_type_resolve(rfp,
                            ctf_type_reference(rfp, rbase));
                } else if (rkind == CTF_K_ARRAY &&
                    ctf_array_info(rfp, rbase, &r) == 0) {
                        rref = ctf_type_resolve(rfp, r.ctr_contents);
                }
        }

        /*
         * We know that one or the other type may still be a zero-valued
         * integer constant.  To simplify the code below, set the integer
         * type variables equal to the non-integer types and proceed.
         */
        if (lp_is_int) {
                lbase = rbase;
                lkind = rkind;
                lref = rref;
                lfp = rfp;
        } else if (rp_is_int) {
                rbase = lbase;
                rkind = lkind;
                rref = lref;
                rfp = lfp;
        }

        lp_is_void = ctf_type_encoding(lfp, lref, &e) == 0 && IS_VOID(e);
        rp_is_void = ctf_type_encoding(rfp, rref, &e) == 0 && IS_VOID(e);

        /*
         * The types are compatible if both are pointers to the same type, or
         * if either pointer is a void pointer.  If they are compatible, set
         * tp to point to the more specific pointer type and return it.
         */
        compat = (lkind == CTF_K_POINTER || lkind == CTF_K_ARRAY) &&
            (rkind == CTF_K_POINTER || rkind == CTF_K_ARRAY) &&
            (lp_is_void || rp_is_void || ctf_type_compat(lfp, lref, rfp, rref));

        if (compat) {
                if (fpp != NULL)
                        *fpp = rp_is_void ? lfp : rfp;
                if (tp != NULL)
                        *tp = rp_is_void ? lbase : rbase;
        }

        return (compat);
}

/*
 * The rules for checking argument types against parameter types are described
 * in the ANSI-C spec (see K&R[A7.3.2] and K&R[A7.17]).  We use the same rule
 * set to determine whether associative array arguments match the prototype.
 */
int
dt_node_is_argcompat(const dt_node_t *lp, const dt_node_t *rp)
{
        ctf_file_t *lfp = lp->dn_ctfp;
        ctf_file_t *rfp = rp->dn_ctfp;

        assert(lp->dn_flags & DT_NF_COOKED);
        assert(rp->dn_flags & DT_NF_COOKED);

        if (dt_node_is_integer(lp) && dt_node_is_integer(rp))
                return (1); /* integer types are compatible */

        if (dt_node_is_strcompat(lp) && dt_node_is_strcompat(rp))
                return (1); /* string types are compatible */

        if (dt_node_is_stack(lp) && dt_node_is_stack(rp))
                return (1); /* stack types are compatible */

        if (dt_node_is_symaddr(lp) && dt_node_is_symaddr(rp))
                return (1); /* symaddr types are compatible */

        if (dt_node_is_usymaddr(lp) && dt_node_is_usymaddr(rp))
                return (1); /* usymaddr types are compatible */

        switch (ctf_type_kind(lfp, ctf_type_resolve(lfp, lp->dn_type))) {
        case CTF_K_FUNCTION:
        case CTF_K_STRUCT:
        case CTF_K_UNION:
                return (ctf_type_compat(lfp, lp->dn_type, rfp, rp->dn_type));
        default:
                return (dt_node_is_ptrcompat(lp, rp, NULL, NULL));
        }
}

/*
 * We provide dt_node_is_posconst() as a convenience routine for callers who
 * wish to verify that an argument is a positive non-zero integer constant.
 */
int
dt_node_is_posconst(const dt_node_t *dnp)
{
        return (dnp->dn_kind == DT_NODE_INT && dnp->dn_value != 0 && (
            (dnp->dn_flags & DT_NF_SIGNED) == 0 || (int64_t)dnp->dn_value > 0));
}

int
dt_node_is_actfunc(const dt_node_t *dnp)
{
        return (dnp->dn_kind == DT_NODE_FUNC &&
            dnp->dn_ident->di_kind == DT_IDENT_ACTFUNC);
}

/*
 * The original rules for integer constant typing are described in K&R[A2.5.1].
 * However, since we support long long, we instead use the rules from ISO C99
 * clause 6.4.4.1 since that is where long longs are formally described.  The
 * rules require us to know whether the constant was specified in decimal or
 * in octal or hex, which we do by looking at our lexer's 'yyintdecimal' flag.
 * The type of an integer constant is the first of the corresponding list in
 * which its value can be represented:
 *
 * unsuffixed decimal:   int, long, long long
 * unsuffixed oct/hex:   int, unsigned int, long, unsigned long,
 *                       long long, unsigned long long
 * suffix [uU]:          unsigned int, unsigned long, unsigned long long
 * suffix [lL] decimal:  long, long long
 * suffix [lL] oct/hex:  long, unsigned long, long long, unsigned long long
 * suffix [uU][Ll]:      unsigned long, unsigned long long
 * suffix ll/LL decimal: long long
 * suffix ll/LL oct/hex: long long, unsigned long long
 * suffix [uU][ll/LL]:   unsigned long long
 *
 * Given that our lexer has already validated the suffixes by regexp matching,
 * there is an obvious way to concisely encode these rules: construct an array
 * of the types in the order int, unsigned int, long, unsigned long, long long,
 * unsigned long long.  Compute an integer array starting index based on the
 * suffix (e.g. none = 0, u = 1, ull = 5), and compute an increment based on
 * the specifier (dec/oct/hex) and suffix (u).  Then iterate from the starting
 * index to the end, advancing using the increment, and searching until we
 * find a limit that matches or we run out of choices (overflow).  To make it
 * even faster, we precompute the table of type information in dtrace_open().
 */
dt_node_t *
dt_node_int(uintmax_t value)
{
        dt_node_t *dnp = dt_node_alloc(DT_NODE_INT);
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;

        int n = (yyintdecimal | (yyintsuffix[0] == 'u')) + 1;
        int i = 0;

        const char *p;
        char c;

        dnp->dn_op = DT_TOK_INT;
        dnp->dn_value = value;

        for (p = yyintsuffix; (c = *p) != '\0'; p++) {
                if (c == 'U' || c == 'u')
                        i += 1;
                else if (c == 'L' || c == 'l')
                        i += 2;
        }

        for (; i < sizeof (dtp->dt_ints) / sizeof (dtp->dt_ints[0]); i += n) {
                if (value <= dtp->dt_ints[i].did_limit) {
                        dt_node_type_assign(dnp,
                            dtp->dt_ints[i].did_ctfp,
                            dtp->dt_ints[i].did_type, B_FALSE);

                        /*
                         * If a prefix character is present in macro text, add
                         * in the corresponding operator node (see dt_lex.l).
                         */
                        switch (yyintprefix) {
                        case '+':
                                return (dt_node_op1(DT_TOK_IPOS, dnp));
                        case '-':
                                return (dt_node_op1(DT_TOK_INEG, dnp));
                        default:
                                return (dnp);
                        }
                }
        }

        xyerror(D_INT_OFLOW, "integer constant 0x%llx cannot be represented "
            "in any built-in integral type\n", (u_longlong_t)value);
        /*NOTREACHED*/
        return (NULL);          /* keep gcc happy */
}

dt_node_t *
dt_node_string(char *string)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        dt_node_t *dnp;

        if (string == NULL)
                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

        dnp = dt_node_alloc(DT_NODE_STRING);
        dnp->dn_op = DT_TOK_STRING;
        dnp->dn_string = string;
        dt_node_type_assign(dnp, DT_STR_CTFP(dtp), DT_STR_TYPE(dtp), B_FALSE);

        return (dnp);
}

dt_node_t *
dt_node_ident(char *name)
{
        dt_ident_t *idp;
        dt_node_t *dnp;

        if (name == NULL)
                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

        /*
         * If the identifier is an inlined integer constant, then create an INT
         * node that is a clone of the inline parse tree node and return that
         * immediately, allowing this inline to be used in parsing contexts
         * that require constant expressions (e.g. scalar array sizes).
         */
        if ((idp = dt_idstack_lookup(&yypcb->pcb_globals, name)) != NULL &&
            (idp->di_flags & DT_IDFLG_INLINE)) {
                dt_idnode_t *inp = idp->di_iarg;

                if (inp->din_root != NULL &&
                    inp->din_root->dn_kind == DT_NODE_INT) {
                        free(name);

                        dnp = dt_node_alloc(DT_NODE_INT);
                        dnp->dn_op = DT_TOK_INT;
                        dnp->dn_value = inp->din_root->dn_value;
                        dt_node_type_propagate(inp->din_root, dnp);

                        return (dnp);
                }
        }

        dnp = dt_node_alloc(DT_NODE_IDENT);
        dnp->dn_op = name[0] == '@' ? DT_TOK_AGG : DT_TOK_IDENT;
        dnp->dn_string = name;

        return (dnp);
}

/*
 * Create an empty node of type corresponding to the given declaration.
 * Explicit references to user types (C or D) are assigned the default
 * stability; references to other types are _dtrace_typattr (Private).
 */
dt_node_t *
dt_node_type(dt_decl_t *ddp)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        dtrace_typeinfo_t dtt;
        dt_node_t *dnp;
        char *name = NULL;
        int err;

        /*
         * If 'ddp' is NULL, we get a decl by popping the decl stack.  This
         * form of dt_node_type() is used by parameter rules in dt_grammar.y.
         */
        if (ddp == NULL)
                ddp = dt_decl_pop_param(&name);

        err = dt_decl_type(ddp, &dtt);
        dt_decl_free(ddp);

        if (err != 0) {
                free(name);
                longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);
        }

        dnp = dt_node_alloc(DT_NODE_TYPE);
        dnp->dn_op = DT_TOK_IDENT;
        dnp->dn_string = name;

        dt_node_type_assign(dnp, dtt.dtt_ctfp, dtt.dtt_type,
            dtt.dtt_flags & DTT_FL_USER ? B_TRUE : B_FALSE);

        if (dtt.dtt_ctfp == dtp->dt_cdefs->dm_ctfp ||
            dtt.dtt_ctfp == dtp->dt_ddefs->dm_ctfp)
                dt_node_attr_assign(dnp, _dtrace_defattr);
        else
                dt_node_attr_assign(dnp, _dtrace_typattr);

        return (dnp);
}

/*
 * Create a type node corresponding to a varargs (...) parameter by just
 * assigning it type CTF_ERR.  The decl processing code will handle this.
 */
dt_node_t *
dt_node_vatype(void)
{
        dt_node_t *dnp = dt_node_alloc(DT_NODE_TYPE);

        dnp->dn_op = DT_TOK_IDENT;
        dnp->dn_ctfp = yypcb->pcb_hdl->dt_cdefs->dm_ctfp;
        dnp->dn_type = CTF_ERR;
        dnp->dn_attr = _dtrace_defattr;

        return (dnp);
}

/*
 * Instantiate a decl using the contents of the current declaration stack.  As
 * we do not currently permit decls to be initialized, this function currently
 * returns NULL and no parse node is created.  When this function is called,
 * the topmost scope's ds_ident pointer will be set to NULL (indicating no
 * init_declarator rule was matched) or will point to the identifier to use.
 */
dt_node_t *
dt_node_decl(void)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        dt_scope_t *dsp = &yypcb->pcb_dstack;
        dt_dclass_t class = dsp->ds_class;
        dt_decl_t *ddp = dt_decl_top();

        dt_module_t *dmp;
        dtrace_typeinfo_t dtt;
        ctf_id_t type;

        char n1[DT_TYPE_NAMELEN];
        char n2[DT_TYPE_NAMELEN];

        if (dt_decl_type(ddp, &dtt) != 0)
                longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);

        /*
         * If we have no declaration identifier, then this is either a spurious
         * declaration of an intrinsic type (e.g. "extern int;") or declaration
         * or redeclaration of a struct, union, or enum type or tag.
         */
        if (dsp->ds_ident == NULL) {
                if (ddp->dd_kind != CTF_K_STRUCT &&
                    ddp->dd_kind != CTF_K_UNION && ddp->dd_kind != CTF_K_ENUM)
                        xyerror(D_DECL_USELESS, "useless declaration\n");

                dt_dprintf("type %s added as id %ld\n", dt_type_name(
                    ddp->dd_ctfp, ddp->dd_type, n1, sizeof (n1)), ddp->dd_type);

                return (NULL);
        }

        if (strchr(dsp->ds_ident, '`') != NULL) {
                xyerror(D_DECL_SCOPE, "D scoping operator may not be used in "
                    "a declaration name (%s)\n", dsp->ds_ident);
        }

        /*
         * If we are nested inside of a C include file, add the declaration to
         * the C definition module; otherwise use the D definition module.
         */
        if (yypcb->pcb_idepth != 0)
                dmp = dtp->dt_cdefs;
        else
                dmp = dtp->dt_ddefs;

        /*
         * If we see a global or static declaration of a function prototype,
         * treat this as equivalent to a D extern declaration.
         */
        if (ctf_type_kind(dtt.dtt_ctfp, dtt.dtt_type) == CTF_K_FUNCTION &&
            (class == DT_DC_DEFAULT || class == DT_DC_STATIC))
                class = DT_DC_EXTERN;

        switch (class) {
        case DT_DC_AUTO:
        case DT_DC_REGISTER:
        case DT_DC_STATIC:
                xyerror(D_DECL_BADCLASS, "specified storage class not "
                    "appropriate in D\n");
                /*NOTREACHED*/

        case DT_DC_EXTERN: {
                dtrace_typeinfo_t ott;
                dtrace_syminfo_t dts;
                GElf_Sym sym;

                int exists = dtrace_lookup_by_name(dtp,
                    dmp->dm_name, dsp->ds_ident, &sym, &dts) == 0;

                if (exists && (dtrace_symbol_type(dtp, &sym, &dts, &ott) != 0 ||
                    ctf_type_cmp(dtt.dtt_ctfp, dtt.dtt_type,
                    ott.dtt_ctfp, ott.dtt_type) != 0)) {
                        xyerror(D_DECL_IDRED, "identifier redeclared: %s`%s\n"
                            "\t current: %s\n\tprevious: %s\n",
                            dmp->dm_name, dsp->ds_ident,
                            dt_type_name(dtt.dtt_ctfp, dtt.dtt_type,
                            n1, sizeof (n1)),
                            dt_type_name(ott.dtt_ctfp, ott.dtt_type,
                            n2, sizeof (n2)));
                } else if (!exists && dt_module_extern(dtp, dmp,
                    dsp->ds_ident, &dtt) == NULL) {
                        xyerror(D_UNKNOWN,
                            "failed to extern %s: %s\n", dsp->ds_ident,
                            dtrace_errmsg(dtp, dtrace_errno(dtp)));
                } else {
                        dt_dprintf("extern %s`%s type=<%s>\n",
                            dmp->dm_name, dsp->ds_ident,
                            dt_type_name(dtt.dtt_ctfp, dtt.dtt_type,
                            n1, sizeof (n1)));
                }
                break;
        }

        case DT_DC_TYPEDEF:
                if (dt_idstack_lookup(&yypcb->pcb_globals, dsp->ds_ident)) {
                        xyerror(D_DECL_IDRED, "global variable identifier "
                            "redeclared: %s\n", dsp->ds_ident);
                }

                if (ctf_lookup_by_name(dmp->dm_ctfp,
                    dsp->ds_ident) != CTF_ERR) {
                        xyerror(D_DECL_IDRED,
                            "typedef redeclared: %s\n", dsp->ds_ident);
                }

                /*
                 * If the source type for the typedef is not defined in the
                 * target container or its parent, copy the type to the target
                 * container and reset dtt_ctfp and dtt_type to the copy.
                 */
                if (dtt.dtt_ctfp != dmp->dm_ctfp &&
                    dtt.dtt_ctfp != ctf_parent_file(dmp->dm_ctfp)) {

                        dtt.dtt_type = ctf_add_type(dmp->dm_ctfp,
                            dtt.dtt_ctfp, dtt.dtt_type);
                        dtt.dtt_ctfp = dmp->dm_ctfp;

                        if (dtt.dtt_type == CTF_ERR ||
                            ctf_update(dtt.dtt_ctfp) == CTF_ERR) {
                                xyerror(D_UNKNOWN, "failed to copy typedef %s "
                                    "source type: %s\n", dsp->ds_ident,
                                    ctf_errmsg(ctf_errno(dtt.dtt_ctfp)));
                        }
                }

                type = ctf_add_typedef(dmp->dm_ctfp,
                    CTF_ADD_ROOT, dsp->ds_ident, dtt.dtt_type);

                if (type == CTF_ERR || ctf_update(dmp->dm_ctfp) == CTF_ERR) {
                        xyerror(D_UNKNOWN, "failed to typedef %s: %s\n",
                            dsp->ds_ident, ctf_errmsg(ctf_errno(dmp->dm_ctfp)));
                }

                dt_dprintf("typedef %s added as id %ld\n", dsp->ds_ident, type);
                break;

        default: {
                ctf_encoding_t cte;
                dt_idhash_t *dhp;
                dt_ident_t *idp;
                dt_node_t idn;
                int assc, idkind;
                uint_t id, kind;
                ushort_t idflags;

                switch (class) {
                case DT_DC_THIS:
                        dhp = yypcb->pcb_locals;
                        idflags = DT_IDFLG_LOCAL;
                        idp = dt_idhash_lookup(dhp, dsp->ds_ident);
                        break;
                case DT_DC_SELF:
                        dhp = dtp->dt_tls;
                        idflags = DT_IDFLG_TLS;
                        idp = dt_idhash_lookup(dhp, dsp->ds_ident);
                        break;
                default:
                        dhp = dtp->dt_globals;
                        idflags = 0;
                        idp = dt_idstack_lookup(
                            &yypcb->pcb_globals, dsp->ds_ident);
                        break;
                }

                if (ddp->dd_kind == CTF_K_ARRAY && ddp->dd_node == NULL) {
                        xyerror(D_DECL_ARRNULL,
                            "array declaration requires array dimension or "
                            "tuple signature: %s\n", dsp->ds_ident);
                }

                if (idp != NULL && idp->di_gen == 0) {
                        xyerror(D_DECL_IDRED, "built-in identifier "
                            "redeclared: %s\n", idp->di_name);
                }

                if (dtrace_lookup_by_type(dtp, DTRACE_OBJ_CDEFS,
                    dsp->ds_ident, NULL) == 0 ||
                    dtrace_lookup_by_type(dtp, DTRACE_OBJ_DDEFS,
                    dsp->ds_ident, NULL) == 0) {
                        xyerror(D_DECL_IDRED, "typedef identifier "
                            "redeclared: %s\n", dsp->ds_ident);
                }

                /*
                 * Cache some attributes of the decl to make the rest of this
                 * code simpler: if the decl is an array which is subscripted
                 * by a type rather than an integer, then it's an associative
                 * array (assc).  We then expect to match either DT_IDENT_ARRAY
                 * for associative arrays or DT_IDENT_SCALAR for anything else.
                 */
                assc = ddp->dd_kind == CTF_K_ARRAY &&
                    ddp->dd_node->dn_kind == DT_NODE_TYPE;

                idkind = assc ? DT_IDENT_ARRAY : DT_IDENT_SCALAR;

                /*
                 * Create a fake dt_node_t on the stack so we can determine the
                 * type of any matching identifier by assigning to this node.
                 * If the pre-existing ident has its di_type set, propagate
                 * the type by hand so as not to trigger a prototype check for
                 * arrays (yet); otherwise we use dt_ident_cook() on the ident
                 * to ensure it is fully initialized before looking at it.
                 */
                bzero(&idn, sizeof (dt_node_t));

                if (idp != NULL && idp->di_type != CTF_ERR)
                        dt_node_type_assign(&idn, idp->di_ctfp, idp->di_type,
                            B_FALSE);
                else if (idp != NULL)
                        (void) dt_ident_cook(&idn, idp, NULL);

                if (assc) {
                        if (class == DT_DC_THIS) {
                                xyerror(D_DECL_LOCASSC, "associative arrays "
                                    "may not be declared as local variables:"
                                    " %s\n", dsp->ds_ident);
                        }

                        if (dt_decl_type(ddp->dd_next, &dtt) != 0)
                                longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);
                }

                if (idp != NULL && (idp->di_kind != idkind ||
                    ctf_type_cmp(dtt.dtt_ctfp, dtt.dtt_type,
                    idn.dn_ctfp, idn.dn_type) != 0)) {
                        xyerror(D_DECL_IDRED, "identifier redeclared: %s\n"
                            "\t current: %s %s\n\tprevious: %s %s\n",
                            dsp->ds_ident, dt_idkind_name(idkind),
                            dt_type_name(dtt.dtt_ctfp,
                            dtt.dtt_type, n1, sizeof (n1)),
                            dt_idkind_name(idp->di_kind),
                            dt_node_type_name(&idn, n2, sizeof (n2)));

                } else if (idp != NULL && assc) {
                        const dt_idsig_t *isp = idp->di_data;
                        dt_node_t *dnp = ddp->dd_node;
                        int argc = 0;

                        for (; dnp != NULL; dnp = dnp->dn_list, argc++) {
                                const dt_node_t *pnp = &isp->dis_args[argc];

                                if (argc >= isp->dis_argc)
                                        continue; /* tuple length mismatch */

                                if (ctf_type_cmp(dnp->dn_ctfp, dnp->dn_type,
                                    pnp->dn_ctfp, pnp->dn_type) == 0)
                                        continue;

                                xyerror(D_DECL_IDRED,
                                    "identifier redeclared: %s\n"
                                    "\t current: %s, key #%d of type %s\n"
                                    "\tprevious: %s, key #%d of type %s\n",
                                    dsp->ds_ident,
                                    dt_idkind_name(idkind), argc + 1,
                                    dt_node_type_name(dnp, n1, sizeof (n1)),
                                    dt_idkind_name(idp->di_kind), argc + 1,
                                    dt_node_type_name(pnp, n2, sizeof (n2)));
                        }

                        if (isp->dis_argc != argc) {
                                xyerror(D_DECL_IDRED,
                                    "identifier redeclared: %s\n"
                                    "\t current: %s of %s, tuple length %d\n"
                                    "\tprevious: %s of %s, tuple length %d\n",
                                    dsp->ds_ident, dt_idkind_name(idkind),
                                    dt_type_name(dtt.dtt_ctfp, dtt.dtt_type,
                                    n1, sizeof (n1)), argc,
                                    dt_idkind_name(idp->di_kind),
                                    dt_node_type_name(&idn, n2, sizeof (n2)),
                                    isp->dis_argc);
                        }

                } else if (idp == NULL) {
                        type = ctf_type_resolve(dtt.dtt_ctfp, dtt.dtt_type);
                        kind = ctf_type_kind(dtt.dtt_ctfp, type);

                        switch (kind) {
                        case CTF_K_INTEGER:
                                if (ctf_type_encoding(dtt.dtt_ctfp, type,
                                    &cte) == 0 && IS_VOID(cte)) {
                                        xyerror(D_DECL_VOIDOBJ, "cannot have "
                                            "void object: %s\n", dsp->ds_ident);
                                }
                                break;
                        case CTF_K_STRUCT:
                        case CTF_K_UNION:
                                if (ctf_type_size(dtt.dtt_ctfp, type) != 0)
                                        break; /* proceed to declaring */
                                /*FALLTHRU*/
                        case CTF_K_FORWARD:
                                xyerror(D_DECL_INCOMPLETE,
                                    "incomplete struct/union/enum %s: %s\n",
                                    dt_type_name(dtt.dtt_ctfp, dtt.dtt_type,
                                    n1, sizeof (n1)), dsp->ds_ident);
                                /*NOTREACHED*/
                        }

                        if (dt_idhash_nextid(dhp, &id) == -1) {
                                xyerror(D_ID_OFLOW, "cannot create %s: limit "
                                    "on number of %s variables exceeded\n",
                                    dsp->ds_ident, dt_idhash_name(dhp));
                        }

                        dt_dprintf("declare %s %s variable %s, id=%u\n",
                            dt_idhash_name(dhp), dt_idkind_name(idkind),
                            dsp->ds_ident, id);

                        idp = dt_idhash_insert(dhp, dsp->ds_ident, idkind,
                            idflags | DT_IDFLG_WRITE | DT_IDFLG_DECL, id,
                            _dtrace_defattr, 0, assc ? &dt_idops_assc :
                            &dt_idops_thaw, NULL, dtp->dt_gen);

                        if (idp == NULL)
                                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

                        dt_ident_type_assign(idp, dtt.dtt_ctfp, dtt.dtt_type);

                        /*
                         * If we are declaring an associative array, use our
                         * fake parse node to cook the new assoc identifier.
                         * This will force the ident code to instantiate the
                         * array type signature corresponding to the list of
                         * types pointed to by ddp->dd_node.  We also reset
                         * the identifier's attributes based upon the result.
                         */
                        if (assc) {
                                idp->di_attr =
                                    dt_ident_cook(&idn, idp, &ddp->dd_node);
                        }
                }
        }

        } /* end of switch */

        free(dsp->ds_ident);
        dsp->ds_ident = NULL;

        return (NULL);
}

dt_node_t *
dt_node_func(dt_node_t *dnp, dt_node_t *args)
{
        dt_ident_t *idp;

        if (dnp->dn_kind != DT_NODE_IDENT) {
                xyerror(D_FUNC_IDENT,
                    "function designator is not of function type\n");
        }

        idp = dt_idstack_lookup(&yypcb->pcb_globals, dnp->dn_string);

        if (idp == NULL) {
                xyerror(D_FUNC_UNDEF,
                    "undefined function name: %s\n", dnp->dn_string);
        }

        if (idp->di_kind != DT_IDENT_FUNC &&
            idp->di_kind != DT_IDENT_AGGFUNC &&
            idp->di_kind != DT_IDENT_ACTFUNC) {
                xyerror(D_FUNC_IDKIND, "%s '%s' may not be referenced as a "
                    "function\n", dt_idkind_name(idp->di_kind), idp->di_name);
        }

        free(dnp->dn_string);
        dnp->dn_string = NULL;

        dnp->dn_kind = DT_NODE_FUNC;
        dnp->dn_flags &= ~DT_NF_COOKED;
        dnp->dn_ident = idp;
        dnp->dn_args = args;
        dnp->dn_list = NULL;

        return (dnp);
}

/*
 * The offsetof() function is special because it takes a type name as an
 * argument.  It does not actually construct its own node; after looking up the
 * structure or union offset, we just return an integer node with the offset.
 */
dt_node_t *
dt_node_offsetof(dt_decl_t *ddp, char *s)
{
        dtrace_typeinfo_t dtt;
        dt_node_t dn;
        char *name;
        int err;

        ctf_membinfo_t ctm;
        ctf_id_t type;
        ctf_file_t *ctfp;
        uint_t kind;

        name = strdupa(s);
        free(s);

        err = dt_decl_type(ddp, &dtt);
        dt_decl_free(ddp);

        if (err != 0)
                longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);

        type = ctf_type_resolve(dtt.dtt_ctfp, dtt.dtt_type);
        kind = ctf_type_kind(dtt.dtt_ctfp, type);

        if (kind != CTF_K_STRUCT && kind != CTF_K_UNION) {
                xyerror(D_OFFSETOF_TYPE,
                    "offsetof operand must be a struct or union type\n");
        }

        if (ctf_member_info(dtt.dtt_ctfp, type, name, &ctm) == CTF_ERR) {
                xyerror(D_UNKNOWN, "failed to determine offset of %s: %s\n",
                    name, ctf_errmsg(ctf_errno(dtt.dtt_ctfp)));
        }

        bzero(&dn, sizeof (dn));
        /*
         * Resolution of CTF_K_FORWARD is unnecessary here, since it can't be
         * both forward _and_ a bitfield, but is done for completeness.
         */
        type = ctm.ctm_type;
        ctfp = dtt.dtt_ctfp;

        dt_resolve_forward_decl(&ctfp, &type);
        dt_node_type_assign(&dn, ctfp, type, B_FALSE);

        if (dn.dn_flags & DT_NF_BITFIELD) {
                xyerror(D_OFFSETOF_BITFIELD,
                    "cannot take offset of a bit-field: %s\n", name);
        }

        return (dt_node_int(ctm.ctm_offset / NBBY));
}

dt_node_t *
dt_node_op1(int op, dt_node_t *cp)
{
        dt_node_t *dnp;

        if (cp->dn_kind == DT_NODE_INT) {
                switch (op) {
                case DT_TOK_INEG:
                        /*
                         * If we're negating an unsigned integer, zero out any
                         * extra top bits to truncate the value to the size of
                         * the effective type determined by dt_node_int().
                         */
                        cp->dn_value = -cp->dn_value;
                        if (!(cp->dn_flags & DT_NF_SIGNED)) {
                                cp->dn_value &= ~0ULL >>
                                    (64 - dt_node_type_size(cp) * NBBY);
                        }
                        /*FALLTHRU*/
                case DT_TOK_IPOS:
                        return (cp);
                case DT_TOK_BNEG:
                        cp->dn_value = ~cp->dn_value;
                        return (cp);
                case DT_TOK_LNEG:
                        cp->dn_value = !cp->dn_value;
                        return (cp);
                }
        }

        /*
         * If sizeof is applied to a type_name or string constant, we can
         * transform 'cp' into an integer constant in the node construction
         * pass so that it can then be used for arithmetic in this pass.
         */
        if (op == DT_TOK_SIZEOF &&
            (cp->dn_kind == DT_NODE_STRING || cp->dn_kind == DT_NODE_TYPE)) {
                dtrace_hdl_t *dtp = yypcb->pcb_hdl;
                size_t size = dt_node_type_size(cp);

                if (size == 0) {
                        xyerror(D_SIZEOF_TYPE, "cannot apply sizeof to an "
                            "operand of unknown size\n");
                }

                dt_node_type_assign(cp, dtp->dt_ddefs->dm_ctfp,
                    ctf_lookup_by_name(dtp->dt_ddefs->dm_ctfp, "size_t"),
                    B_FALSE);

                cp->dn_kind = DT_NODE_INT;
                cp->dn_op = DT_TOK_INT;
                cp->dn_value = size;

                return (cp);
        }

        dnp = dt_node_alloc(DT_NODE_OP1);
        assert(op <= USHRT_MAX);
        dnp->dn_op = (ushort_t)op;
        dnp->dn_child = cp;

        return (dnp);
}

/*
 * If an integer constant is being cast to another integer type, we can
 * perform the cast as part of integer constant folding in this pass. We must
 * take action when the integer is being cast to a smaller type or if it is
 * changing signed-ness. If so, we first shift rp's bits bits high (losing
 * excess bits if narrowing) and then shift them down with either a logical
 * shift (unsigned) or arithmetic shift (signed).
 */
static void
dt_cast(dt_node_t *lp, dt_node_t *rp)
{
        size_t srcsize = dt_node_type_size(rp);
        size_t dstsize = dt_node_type_size(lp);

        if (dstsize < srcsize) {
                int n = (sizeof (uint64_t) - dstsize) * NBBY;
                rp->dn_value <<= n;
                rp->dn_value >>= n;
        } else if (dstsize > srcsize) {
                int n = (sizeof (uint64_t) - srcsize) * NBBY;
                int s = (dstsize - srcsize) * NBBY;

                rp->dn_value <<= n;
                if (rp->dn_flags & DT_NF_SIGNED) {
                        rp->dn_value = (intmax_t)rp->dn_value >> s;
                        rp->dn_value >>= n - s;
                } else {
                        rp->dn_value >>= n;
                }
        }
}

dt_node_t *
dt_node_op2(int op, dt_node_t *lp, dt_node_t *rp)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        dt_node_t *dnp;

        /*
         * First we check for operations that are illegal -- namely those that
         * might result in integer division by zero, and abort if one is found.
         */
        if (rp->dn_kind == DT_NODE_INT && rp->dn_value == 0 &&
            (op == DT_TOK_MOD || op == DT_TOK_DIV ||
            op == DT_TOK_MOD_EQ || op == DT_TOK_DIV_EQ))
                xyerror(D_DIV_ZERO, "expression contains division by zero\n");

        /*
         * If both children are immediate values, we can just perform inline
         * calculation and return a new immediate node with the result.
         */
        if (lp->dn_kind == DT_NODE_INT && rp->dn_kind == DT_NODE_INT) {
                uintmax_t l = lp->dn_value;
                uintmax_t r = rp->dn_value;

                dnp = dt_node_int(0); /* allocate new integer node for result */

                switch (op) {
                case DT_TOK_LOR:
                        dnp->dn_value = l || r;
                        dt_node_type_assign(dnp,
                            DT_INT_CTFP(dtp), DT_INT_TYPE(dtp), B_FALSE);
                        break;
                case DT_TOK_LXOR:
                        dnp->dn_value = (l != 0) ^ (r != 0);
                        dt_node_type_assign(dnp,
                            DT_INT_CTFP(dtp), DT_INT_TYPE(dtp), B_FALSE);
                        break;
                case DT_TOK_LAND:
                        dnp->dn_value = l && r;
                        dt_node_type_assign(dnp,
                            DT_INT_CTFP(dtp), DT_INT_TYPE(dtp), B_FALSE);
                        break;
                case DT_TOK_BOR:
                        dnp->dn_value = l | r;
                        dt_node_promote(lp, rp, dnp);
                        break;
                case DT_TOK_XOR:
                        dnp->dn_value = l ^ r;
                        dt_node_promote(lp, rp, dnp);
                        break;
                case DT_TOK_BAND:
                        dnp->dn_value = l & r;
                        dt_node_promote(lp, rp, dnp);
                        break;
                case DT_TOK_EQU:
                        dnp->dn_value = l == r;
                        dt_node_type_assign(dnp,
                            DT_INT_CTFP(dtp), DT_INT_TYPE(dtp), B_FALSE);
                        break;
                case DT_TOK_NEQ:
                        dnp->dn_value = l != r;
                        dt_node_type_assign(dnp,
                            DT_INT_CTFP(dtp), DT_INT_TYPE(dtp), B_FALSE);
                        break;
                case DT_TOK_LT:
                        dt_node_promote(lp, rp, dnp);
                        if (dnp->dn_flags & DT_NF_SIGNED)
                                dnp->dn_value = (intmax_t)l < (intmax_t)r;
                        else
                                dnp->dn_value = l < r;
                        dt_node_type_assign(dnp,
                            DT_INT_CTFP(dtp), DT_INT_TYPE(dtp), B_FALSE);
                        break;
                case DT_TOK_LE:
                        dt_node_promote(lp, rp, dnp);
                        if (dnp->dn_flags & DT_NF_SIGNED)
                                dnp->dn_value = (intmax_t)l <= (intmax_t)r;
                        else
                                dnp->dn_value = l <= r;
                        dt_node_type_assign(dnp,
                            DT_INT_CTFP(dtp), DT_INT_TYPE(dtp), B_FALSE);
                        break;
                case DT_TOK_GT:
                        dt_node_promote(lp, rp, dnp);
                        if (dnp->dn_flags & DT_NF_SIGNED)
                                dnp->dn_value = (intmax_t)l > (intmax_t)r;
                        else
                                dnp->dn_value = l > r;
                        dt_node_type_assign(dnp,
                            DT_INT_CTFP(dtp), DT_INT_TYPE(dtp), B_FALSE);
                        break;
                case DT_TOK_GE:
                        dt_node_promote(lp, rp, dnp);
                        if (dnp->dn_flags & DT_NF_SIGNED)
                                dnp->dn_value = (intmax_t)l >= (intmax_t)r;
                        else
                                dnp->dn_value = l >= r;
                        dt_node_type_assign(dnp,
                            DT_INT_CTFP(dtp), DT_INT_TYPE(dtp), B_FALSE);
                        break;
                case DT_TOK_LSH:
                        dnp->dn_value = l << r;
                        dt_node_type_propagate(lp, dnp);
                        dt_node_attr_assign(rp,
                            dt_attr_min(lp->dn_attr, rp->dn_attr));
                        break;
                case DT_TOK_RSH:
                        dnp->dn_value = l >> r;
                        dt_node_type_propagate(lp, dnp);
                        dt_node_attr_assign(rp,
                            dt_attr_min(lp->dn_attr, rp->dn_attr));
                        break;
                case DT_TOK_ADD:
                        dnp->dn_value = l + r;
                        dt_node_promote(lp, rp, dnp);
                        break;
                case DT_TOK_SUB:
                        dnp->dn_value = l - r;
                        dt_node_promote(lp, rp, dnp);
                        break;
                case DT_TOK_MUL:
                        dnp->dn_value = l * r;
                        dt_node_promote(lp, rp, dnp);
                        break;
                case DT_TOK_DIV:
                        dt_node_promote(lp, rp, dnp);
                        if (dnp->dn_flags & DT_NF_SIGNED)
                                dnp->dn_value = (intmax_t)l / (intmax_t)r;
                        else
                                dnp->dn_value = l / r;
                        break;
                case DT_TOK_MOD:
                        dt_node_promote(lp, rp, dnp);
                        if (dnp->dn_flags & DT_NF_SIGNED)
                                dnp->dn_value = (intmax_t)l % (intmax_t)r;
                        else
                                dnp->dn_value = l % r;
                        break;
                default:
                        dt_node_free(dnp);
                        dnp = NULL;
                }

                if (dnp != NULL) {
                        dt_node_free(lp);
                        dt_node_free(rp);
                        return (dnp);
                }
        }

        if (op == DT_TOK_LPAR && rp->dn_kind == DT_NODE_INT &&
            dt_node_is_integer(lp)) {
                dt_cast(lp, rp);
                dt_node_type_propagate(lp, rp);
                dt_node_attr_assign(rp, dt_attr_min(lp->dn_attr, rp->dn_attr));
                dt_node_free(lp);

                return (rp);
        }

        /*
         * If no immediate optimizations are available, create an new OP2 node
         * and glue the left and right children into place and return.
         */
        dnp = dt_node_alloc(DT_NODE_OP2);
        assert(op <= USHRT_MAX);
        dnp->dn_op = (ushort_t)op;
        dnp->dn_left = lp;
        dnp->dn_right = rp;

        return (dnp);
}

dt_node_t *
dt_node_op3(dt_node_t *expr, dt_node_t *lp, dt_node_t *rp)
{
        dt_node_t *dnp;

        if (expr->dn_kind == DT_NODE_INT)
                return (expr->dn_value != 0 ? lp : rp);

        dnp = dt_node_alloc(DT_NODE_OP3);
        dnp->dn_op = DT_TOK_QUESTION;
        dnp->dn_expr = expr;
        dnp->dn_left = lp;
        dnp->dn_right = rp;

        return (dnp);
}

dt_node_t *
dt_node_statement(dt_node_t *expr)
{
        dt_node_t *dnp;

        if (expr->dn_kind == DT_NODE_AGG)
                return (expr);

        if (expr->dn_kind == DT_NODE_FUNC &&
            expr->dn_ident->di_kind == DT_IDENT_ACTFUNC)
                dnp = dt_node_alloc(DT_NODE_DFUNC);
        else
                dnp = dt_node_alloc(DT_NODE_DEXPR);

        dnp->dn_expr = expr;
        return (dnp);
}

dt_node_t *
dt_node_if(dt_node_t *pred, dt_node_t *acts, dt_node_t *else_acts)
{
        dt_node_t *dnp = dt_node_alloc(DT_NODE_IF);
        dnp->dn_conditional = pred;
        dnp->dn_body = acts;
        dnp->dn_alternate_body = else_acts;

        return (dnp);
}

dt_node_t *
dt_node_pdesc_by_name(char *spec)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        dt_node_t *dnp;

        if (spec == NULL)
                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

        dnp = dt_node_alloc(DT_NODE_PDESC);
        dnp->dn_spec = spec;
        dnp->dn_desc = malloc(sizeof (dtrace_probedesc_t));

        if (dnp->dn_desc == NULL)
                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

        if (dtrace_xstr2desc(dtp, yypcb->pcb_pspec, dnp->dn_spec,
            yypcb->pcb_sargc, yypcb->pcb_sargv, dnp->dn_desc) != 0) {
                xyerror(D_PDESC_INVAL, "invalid probe description \"%s\": %s\n",
                    dnp->dn_spec, dtrace_errmsg(dtp, dtrace_errno(dtp)));
        }

        free(dnp->dn_spec);
        dnp->dn_spec = NULL;

        return (dnp);
}

dt_node_t *
dt_node_pdesc_by_id(uintmax_t id)
{
        static const char *const names[] = {
                "providers", "modules", "functions"
        };

        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        dt_node_t *dnp = dt_node_alloc(DT_NODE_PDESC);

        if ((dnp->dn_desc = malloc(sizeof (dtrace_probedesc_t))) == NULL)
                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

        if (id > UINT_MAX) {
                xyerror(D_PDESC_INVAL, "identifier %llu exceeds maximum "
                    "probe id\n", (u_longlong_t)id);
        }

        if (yypcb->pcb_pspec != DTRACE_PROBESPEC_NAME) {
                xyerror(D_PDESC_INVAL, "probe identifier %llu not permitted "
                    "when specifying %s\n", (u_longlong_t)id,
                    names[yypcb->pcb_pspec]);
        }

        if (dtrace_id2desc(dtp, (dtrace_id_t)id, dnp->dn_desc) != 0) {
                xyerror(D_PDESC_INVAL, "invalid probe identifier %llu: %s\n",
                    (u_longlong_t)id, dtrace_errmsg(dtp, dtrace_errno(dtp)));
        }

        return (dnp);
}

dt_node_t *
dt_node_clause(dt_node_t *pdescs, dt_node_t *pred, dt_node_t *acts)
{
        dt_node_t *dnp = dt_node_alloc(DT_NODE_CLAUSE);

        dnp->dn_pdescs = pdescs;
        dnp->dn_pred = pred;
        dnp->dn_acts = acts;

        return (dnp);
}

dt_node_t *
dt_node_inline(dt_node_t *expr)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        dt_scope_t *dsp = &yypcb->pcb_dstack;
        dt_decl_t *ddp = dt_decl_top();

        char n[DT_TYPE_NAMELEN];
        dtrace_typeinfo_t dtt;

        dt_ident_t *idp, *rdp;
        dt_idnode_t *inp;
        dt_node_t *dnp;

        if (dt_decl_type(ddp, &dtt) != 0)
                longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);

        if (dsp->ds_class != DT_DC_DEFAULT) {
                xyerror(D_DECL_BADCLASS, "specified storage class not "
                    "appropriate for inline declaration\n");
        }

        if (dsp->ds_ident == NULL)
                xyerror(D_DECL_USELESS, "inline declaration requires a name\n");

        if ((idp = dt_idstack_lookup(
            &yypcb->pcb_globals, dsp->ds_ident)) != NULL) {
                xyerror(D_DECL_IDRED, "identifier redefined: %s\n\t current: "
                    "inline definition\n\tprevious: %s %s\n",
                    idp->di_name, dt_idkind_name(idp->di_kind),
                    (idp->di_flags & DT_IDFLG_INLINE) ? "inline" : "");
        }

        /*
         * If we are declaring an inlined array, verify that we have a tuple
         * signature, and then recompute 'dtt' as the array's value type.
         */
        if (ddp->dd_kind == CTF_K_ARRAY) {
                if (ddp->dd_node == NULL) {
                        xyerror(D_DECL_ARRNULL, "inline declaration requires "
                            "array tuple signature: %s\n", dsp->ds_ident);
                }

                if (ddp->dd_node->dn_kind != DT_NODE_TYPE) {
                        xyerror(D_DECL_ARRNULL, "inline declaration cannot be "
                            "of scalar array type: %s\n", dsp->ds_ident);
                }

                if (dt_decl_type(ddp->dd_next, &dtt) != 0)
                        longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);
        }

        /*
         * If the inline identifier is not defined, then create it with the
         * orphan flag set.  We do not insert the identifier into dt_globals
         * until we have successfully cooked the right-hand expression, below.
         */
        dnp = dt_node_alloc(DT_NODE_INLINE);
        dt_node_type_assign(dnp, dtt.dtt_ctfp, dtt.dtt_type, B_FALSE);
        dt_node_attr_assign(dnp, _dtrace_defattr);

        if (dt_node_is_void(dnp)) {
                xyerror(D_DECL_VOIDOBJ,
                    "cannot declare void inline: %s\n", dsp->ds_ident);
        }

        if (ctf_type_kind(dnp->dn_ctfp, ctf_type_resolve(
            dnp->dn_ctfp, dnp->dn_type)) == CTF_K_FORWARD) {
                xyerror(D_DECL_INCOMPLETE,
                    "incomplete struct/union/enum %s: %s\n",
                    dt_node_type_name(dnp, n, sizeof (n)), dsp->ds_ident);
        }

        if ((inp = malloc(sizeof (dt_idnode_t))) == NULL)
                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

        bzero(inp, sizeof (dt_idnode_t));

        idp = dnp->dn_ident = dt_ident_create(dsp->ds_ident,
            ddp->dd_kind == CTF_K_ARRAY ? DT_IDENT_ARRAY : DT_IDENT_SCALAR,
            DT_IDFLG_INLINE | DT_IDFLG_REF | DT_IDFLG_DECL | DT_IDFLG_ORPHAN, 0,
            _dtrace_defattr, 0, &dt_idops_inline, inp, dtp->dt_gen);

        if (idp == NULL) {
                free(inp);
                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
        }

        /*
         * If we're inlining an associative array, create a private identifier
         * hash containing the named parameters and store it in inp->din_hash.
         * We then push this hash on to the top of the pcb_globals stack.
         */
        if (ddp->dd_kind == CTF_K_ARRAY) {
                dt_idnode_t *pinp;
                dt_ident_t *pidp;
                dt_node_t *pnp;
                uint_t i = 0;

                for (pnp = ddp->dd_node; pnp != NULL; pnp = pnp->dn_list)
                        i++; /* count up parameters for din_argv[] */

                inp->din_hash = dt_idhash_create("inline args", NULL, 0, 0);
                inp->din_argv = calloc(i, sizeof (dt_ident_t *));

                if (inp->din_hash == NULL || inp->din_argv == NULL)
                        longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

                /*
                 * Create an identifier for each parameter as a scalar inline,
                 * and store it in din_hash and in position in din_argv[].  The
                 * parameter identifiers also use dt_idops_inline, but we leave
                 * the dt_idnode_t argument 'pinp' zeroed.  This will be filled
                 * in by the code generation pass with references to the args.
                 */
                for (i = 0, pnp = ddp->dd_node;
                    pnp != NULL; pnp = pnp->dn_list, i++) {

                        if (pnp->dn_string == NULL)
                                continue; /* ignore anonymous parameters */

                        if ((pinp = malloc(sizeof (dt_idnode_t))) == NULL)
                                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

                        pidp = dt_idhash_insert(inp->din_hash, pnp->dn_string,
                            DT_IDENT_SCALAR, DT_IDFLG_DECL | DT_IDFLG_INLINE, 0,
                            _dtrace_defattr, 0, &dt_idops_inline,
                            pinp, dtp->dt_gen);

                        if (pidp == NULL) {
                                free(pinp);
                                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
                        }

                        inp->din_argv[i] = pidp;
                        bzero(pinp, sizeof (dt_idnode_t));
                        dt_ident_type_assign(pidp, pnp->dn_ctfp, pnp->dn_type);
                }

                dt_idstack_push(&yypcb->pcb_globals, inp->din_hash);
        }

        /*
         * Unlike most constructors, we need to explicitly cook the right-hand
         * side of the inline definition immediately to prevent recursion.  If
         * the right-hand side uses the inline itself, the cook will fail.
         */
        expr = dt_node_cook(expr, DT_IDFLG_REF);

        if (ddp->dd_kind == CTF_K_ARRAY)
                dt_idstack_pop(&yypcb->pcb_globals, inp->din_hash);

        /*
         * Set the type, attributes, and flags for the inline.  If the right-
         * hand expression has an identifier, propagate its flags.  Then cook
         * the identifier to fully initialize it: if we're declaring an inline
         * associative array this will construct a type signature from 'ddp'.
         */
        if (dt_node_is_dynamic(expr))
                rdp = dt_ident_resolve(expr->dn_ident);
        else if (expr->dn_kind == DT_NODE_VAR || expr->dn_kind == DT_NODE_SYM)
                rdp = expr->dn_ident;
        else
                rdp = NULL;

        if (rdp != NULL) {
                idp->di_flags |= (rdp->di_flags &
                    (DT_IDFLG_WRITE | DT_IDFLG_USER | DT_IDFLG_PRIM));
        }

        idp->di_attr = dt_attr_min(_dtrace_defattr, expr->dn_attr);
        dt_ident_type_assign(idp, dtt.dtt_ctfp, dtt.dtt_type);
        (void) dt_ident_cook(dnp, idp, &ddp->dd_node);

        /*
         * Store the parse tree nodes for 'expr' inside of idp->di_data ('inp')
         * so that they will be preserved with this identifier.  Then pop the
         * inline declaration from the declaration stack and restore the lexer.
         */
        inp->din_list = yypcb->pcb_list;
        inp->din_root = expr;

        dt_decl_free(dt_decl_pop());
        yybegin(YYS_CLAUSE);

        /*
         * Finally, insert the inline identifier into dt_globals to make it
         * visible, and then cook 'dnp' to check its type against 'expr'.
         */
        dt_idhash_xinsert(dtp->dt_globals, idp);
        return (dt_node_cook(dnp, DT_IDFLG_REF));
}

dt_node_t *
dt_node_member(dt_decl_t *ddp, char *name, dt_node_t *expr)
{
        dtrace_typeinfo_t dtt;
        dt_node_t *dnp;
        int err;

        if (ddp != NULL) {
                err = dt_decl_type(ddp, &dtt);
                dt_decl_free(ddp);

                if (err != 0)
                        longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);
        }

        dnp = dt_node_alloc(DT_NODE_MEMBER);
        dnp->dn_membname = name;
        dnp->dn_membexpr = expr;

        if (ddp != NULL)
                dt_node_type_assign(dnp, dtt.dtt_ctfp, dtt.dtt_type,
                    dtt.dtt_flags & DTT_FL_USER ? B_TRUE : B_FALSE);

        return (dnp);
}

dt_node_t *
dt_node_xlator(dt_decl_t *ddp, dt_decl_t *sdp, char *name, dt_node_t *members)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        dtrace_typeinfo_t src, dst;
        dt_node_t sn, dn;
        dt_xlator_t *dxp;
        dt_node_t *dnp;
        int edst, esrc;
        uint_t kind;

        char n1[DT_TYPE_NAMELEN];
        char n2[DT_TYPE_NAMELEN];

        edst = dt_decl_type(ddp, &dst);
        dt_decl_free(ddp);

        esrc = dt_decl_type(sdp, &src);
        dt_decl_free(sdp);

        if (edst != 0 || esrc != 0) {
                free(name);
                longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);
        }

        bzero(&sn, sizeof (sn));
        dt_node_type_assign(&sn, src.dtt_ctfp, src.dtt_type, B_FALSE);

        bzero(&dn, sizeof (dn));
        dt_node_type_assign(&dn, dst.dtt_ctfp, dst.dtt_type, B_FALSE);

        if (dt_xlator_lookup(dtp, &sn, &dn, DT_XLATE_EXACT) != NULL) {
                xyerror(D_XLATE_REDECL,
                    "translator from %s to %s has already been declared\n",
                    dt_node_type_name(&sn, n1, sizeof (n1)),
                    dt_node_type_name(&dn, n2, sizeof (n2)));
        }

        kind = ctf_type_kind(dst.dtt_ctfp,
            ctf_type_resolve(dst.dtt_ctfp, dst.dtt_type));

        if (kind == CTF_K_FORWARD) {
                xyerror(D_XLATE_SOU, "incomplete struct/union/enum %s\n",
                    dt_type_name(dst.dtt_ctfp, dst.dtt_type, n1, sizeof (n1)));
        }

        if (kind != CTF_K_STRUCT && kind != CTF_K_UNION) {
                xyerror(D_XLATE_SOU,
                    "translator output type must be a struct or union\n");
        }

        dxp = dt_xlator_create(dtp, &src, &dst, name, members, yypcb->pcb_list);
        yybegin(YYS_CLAUSE);
        free(name);

        if (dxp == NULL)
                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

        dnp = dt_node_alloc(DT_NODE_XLATOR);
        dnp->dn_xlator = dxp;
        dnp->dn_members = members;

        return (dt_node_cook(dnp, DT_IDFLG_REF));
}

dt_node_t *
dt_node_probe(char *s, int protoc, dt_node_t *nargs, dt_node_t *xargs)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        int nargc, xargc;
        dt_node_t *dnp;

        size_t len = strlen(s) + 3; /* +3 for :: and \0 */
        char *name = alloca(len);

        (void) snprintf(name, len, "::%s", s);
        (void) strhyphenate(name);
        free(s);

        if (strchr(name, '`') != NULL) {
                xyerror(D_PROV_BADNAME, "probe name may not "
                    "contain scoping operator: %s\n", name);
        }

        if (strlen(name) - 2 >= DTRACE_NAMELEN) {
                xyerror(D_PROV_BADNAME, "probe name may not exceed %d "
                    "characters: %s\n", DTRACE_NAMELEN - 1, name);
        }

        dnp = dt_node_alloc(DT_NODE_PROBE);

        dnp->dn_ident = dt_ident_create(name, DT_IDENT_PROBE,
            DT_IDFLG_ORPHAN, DTRACE_IDNONE, _dtrace_defattr, 0,
            &dt_idops_probe, NULL, dtp->dt_gen);

        nargc = dt_decl_prototype(nargs, nargs,
            "probe input", DT_DP_VOID | DT_DP_ANON);

        xargc = dt_decl_prototype(xargs, nargs,
            "probe output", DT_DP_VOID);

        if (nargc > UINT8_MAX) {
                xyerror(D_PROV_PRARGLEN, "probe %s input prototype exceeds %u "
                    "parameters: %d params used\n", name, UINT8_MAX, nargc);
        }

        if (xargc > UINT8_MAX) {
                xyerror(D_PROV_PRARGLEN, "probe %s output prototype exceeds %u "
                    "parameters: %d params used\n", name, UINT8_MAX, xargc);
        }

        if (dnp->dn_ident == NULL || dt_probe_create(dtp,
            dnp->dn_ident, protoc, nargs, nargc, xargs, xargc) == NULL)
                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

        return (dnp);
}

dt_node_t *
dt_node_provider(char *name, dt_node_t *probes)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        dt_node_t *dnp = dt_node_alloc(DT_NODE_PROVIDER);
        dt_node_t *lnp;
        size_t len;

        dnp->dn_provname = name;
        dnp->dn_probes = probes;

        if (strchr(name, '`') != NULL) {
                dnerror(dnp, D_PROV_BADNAME, "provider name may not "
                    "contain scoping operator: %s\n", name);
        }

        if ((len = strlen(name)) >= DTRACE_PROVNAMELEN) {
                dnerror(dnp, D_PROV_BADNAME, "provider name may not exceed %d "
                    "characters: %s\n", DTRACE_PROVNAMELEN - 1, name);
        }

        if (isdigit(name[len - 1])) {
                dnerror(dnp, D_PROV_BADNAME, "provider name may not "
                    "end with a digit: %s\n", name);
        }

        /*
         * Check to see if the provider is already defined or visible through
         * dtrace(7D).  If so, set dn_provred to treat it as a re-declaration.
         * If not, create a new provider and set its interface-only flag.  This
         * flag may be cleared later by calls made to dt_probe_declare().
         */
        if ((dnp->dn_provider = dt_provider_lookup(dtp, name)) != NULL)
                dnp->dn_provred = B_TRUE;
        else if ((dnp->dn_provider = dt_provider_create(dtp, name)) == NULL)
                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
        else
                dnp->dn_provider->pv_flags |= DT_PROVIDER_INTF;

        /*
         * Store all parse nodes created since we consumed the DT_KEY_PROVIDER
         * token with the provider and then restore our lexing state to CLAUSE.
         * Note that if dnp->dn_provred is true, we may end up storing dups of
         * a provider's interface and implementation: we eat this space because
         * the implementation will likely need to redeclare probe members, and
         * therefore may result in those member nodes becoming persistent.
         */
        for (lnp = yypcb->pcb_list; lnp->dn_link != NULL; lnp = lnp->dn_link)
                continue; /* skip to end of allocation list */

        lnp->dn_link = dnp->dn_provider->pv_nodes;
        dnp->dn_provider->pv_nodes = yypcb->pcb_list;

        yybegin(YYS_CLAUSE);
        return (dnp);
}

dt_node_t *
dt_node_program(dt_node_t *lnp)
{
        dt_node_t *dnp = dt_node_alloc(DT_NODE_PROG);
        dnp->dn_list = lnp;
        return (dnp);
}

/*
 * This function provides the underlying implementation of cooking an
 * identifier given its node, a hash of dynamic identifiers, an identifier
 * kind, and a boolean flag indicating whether we are allowed to instantiate
 * a new identifier if the string is not found.  This function is either
 * called from dt_cook_ident(), below, or directly by the various cooking
 * routines that are allowed to instantiate identifiers (e.g. op2 TOK_ASGN).
 */
static void
dt_xcook_ident(dt_node_t *dnp, dt_idhash_t *dhp, uint_t idkind, int create)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        const char *sname = dt_idhash_name(dhp);
        int uref = 0;

        dtrace_attribute_t attr = _dtrace_defattr;
        dt_ident_t *idp;
        dtrace_syminfo_t dts;
        GElf_Sym sym;

        const char *scope, *mark;
        uchar_t dnkind;
        char *name;

        /*
         * Look for scoping marks in the identifier.  If one is found, set our
         * scope to either DTRACE_OBJ_KMODS or UMODS or to the first part of
         * the string that specifies the scope using an explicit module name.
         * If two marks in a row are found, set 'uref' (user symbol reference).
         * Otherwise we set scope to DTRACE_OBJ_EXEC, indicating that normal
         * scope is desired and we should search the specified idhash.
         */
        if ((name = strrchr(dnp->dn_string, '`')) != NULL) {
                if (name > dnp->dn_string && name[-1] == '`') {
                        uref++;
                        name[-1] = '\0';
                }

                if (name == dnp->dn_string + uref)
                        scope = uref ? DTRACE_OBJ_UMODS : DTRACE_OBJ_KMODS;
                else
                        scope = dnp->dn_string;

                *name++ = '\0'; /* leave name pointing after scoping mark */
                dnkind = DT_NODE_VAR;

        } else if (idkind == DT_IDENT_AGG) {
                scope = DTRACE_OBJ_EXEC;
                name = dnp->dn_string + 1;
                dnkind = DT_NODE_AGG;
        } else {
                scope = DTRACE_OBJ_EXEC;
                name = dnp->dn_string;
                dnkind = DT_NODE_VAR;
        }

        /*
         * If create is set to false, and we fail our idhash lookup, preset
         * the errno code to EDT_NOVAR for our final error message below.
         * If we end up calling dtrace_lookup_by_name(), it will reset the
         * errno appropriately and that error will be reported instead.
         */
        (void) dt_set_errno(dtp, EDT_NOVAR);
        mark = uref ? "``" : "`";

        if (scope == DTRACE_OBJ_EXEC && (
            (dhp != dtp->dt_globals &&
            (idp = dt_idhash_lookup(dhp, name)) != NULL) ||
            (dhp == dtp->dt_globals &&
            (idp = dt_idstack_lookup(&yypcb->pcb_globals, name)) != NULL))) {
                /*
                 * Check that we are referencing the ident in the manner that
                 * matches its type if this is a global lookup.  In the TLS or
                 * local case, we don't know how the ident will be used until
                 * the time operator -> is seen; more parsing is needed.
                 */
                if (idp->di_kind != idkind && dhp == dtp->dt_globals) {
                        xyerror(D_IDENT_BADREF, "%s '%s' may not be referenced "
                            "as %s\n", dt_idkind_name(idp->di_kind),
                            idp->di_name, dt_idkind_name(idkind));
                }

                /*
                 * Arrays and aggregations are not cooked individually. They
                 * have dynamic types and must be referenced using operator [].
                 * This is handled explicitly by the code for DT_TOK_LBRAC.
                 */
                if (idp->di_kind != DT_IDENT_ARRAY &&
                    idp->di_kind != DT_IDENT_AGG)
                        attr = dt_ident_cook(dnp, idp, NULL);
                else {
                        dt_node_type_assign(dnp,
                            DT_DYN_CTFP(dtp), DT_DYN_TYPE(dtp), B_FALSE);
                        attr = idp->di_attr;
                }

                free(dnp->dn_string);
                dnp->dn_string = NULL;
                dnp->dn_kind = dnkind;
                dnp->dn_ident = idp;
                dnp->dn_flags |= DT_NF_LVALUE;

                if (idp->di_flags & DT_IDFLG_WRITE)
                        dnp->dn_flags |= DT_NF_WRITABLE;

                dt_node_attr_assign(dnp, attr);

        } else if (dhp == dtp->dt_globals && scope != DTRACE_OBJ_EXEC &&
            dtrace_lookup_by_name(dtp, scope, name, &sym, &dts) == 0) {

                dt_module_t *mp = dt_module_lookup_by_name(dtp, dts.dts_object);
                int umod = (mp->dm_flags & DT_DM_KERNEL) == 0;
                static const char *const kunames[] = { "kernel", "user" };

                dtrace_typeinfo_t dtt;
                dtrace_syminfo_t *sip;

                if (uref ^ umod) {
                        xyerror(D_SYM_BADREF, "%s module '%s' symbol '%s' may "
                            "not be referenced as a %s symbol\n", kunames[umod],
                            dts.dts_object, dts.dts_name, kunames[uref]);
                }

                if (dtrace_symbol_type(dtp, &sym, &dts, &dtt) != 0) {
                        /*
                         * For now, we special-case EDT_DATAMODEL to clarify
                         * that mixed data models are not currently supported.
                         */
                        if (dtp->dt_errno == EDT_DATAMODEL) {
                                xyerror(D_SYM_MODEL, "cannot use %s symbol "
                                    "%s%s%s in a %s D program\n",
                                    dt_module_modelname(mp),
                                    dts.dts_object, mark, dts.dts_name,
                                    dt_module_modelname(dtp->dt_ddefs));
                        }

                        xyerror(D_SYM_NOTYPES,
                            "no symbolic type information is available for "
                            "%s%s%s: %s\n", dts.dts_object, mark, dts.dts_name,
                            dtrace_errmsg(dtp, dtrace_errno(dtp)));
                }

                idp = dt_ident_create(name, DT_IDENT_SYMBOL, 0, 0,
                    _dtrace_symattr, 0, &dt_idops_thaw, NULL, dtp->dt_gen);

                if (idp == NULL)
                        longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

                if (mp->dm_flags & DT_DM_PRIMARY)
                        idp->di_flags |= DT_IDFLG_PRIM;

                idp->di_next = dtp->dt_externs;
                dtp->dt_externs = idp;

                if ((sip = malloc(sizeof (dtrace_syminfo_t))) == NULL)
                        longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

                bcopy(&dts, sip, sizeof (dtrace_syminfo_t));
                idp->di_data = sip;
                idp->di_ctfp = dtt.dtt_ctfp;
                idp->di_type = dtt.dtt_type;

                free(dnp->dn_string);
                dnp->dn_string = NULL;
                dnp->dn_kind = DT_NODE_SYM;
                dnp->dn_ident = idp;
                dnp->dn_flags |= DT_NF_LVALUE;

                dt_node_type_assign(dnp, dtt.dtt_ctfp, dtt.dtt_type,
                    dtt.dtt_flags & DTT_FL_USER ? B_TRUE : B_FALSE);
                dt_node_attr_assign(dnp, _dtrace_symattr);

                if (uref) {
                        idp->di_flags |= DT_IDFLG_USER;
                        dnp->dn_flags |= DT_NF_USERLAND;
                }

        } else if (scope == DTRACE_OBJ_EXEC && create == B_TRUE) {
                uint_t flags = DT_IDFLG_WRITE;
                uint_t id;

                if (dt_idhash_nextid(dhp, &id) == -1) {
                        xyerror(D_ID_OFLOW, "cannot create %s: limit on number "
                            "of %s variables exceeded\n", name, sname);
                }

                if (dhp == yypcb->pcb_locals)
                        flags |= DT_IDFLG_LOCAL;
                else if (dhp == dtp->dt_tls)
                        flags |= DT_IDFLG_TLS;

                dt_dprintf("create %s %s variable %s, id=%u\n",
                    sname, dt_idkind_name(idkind), name, id);

                if (idkind == DT_IDENT_ARRAY || idkind == DT_IDENT_AGG) {
                        idp = dt_idhash_insert(dhp, name,
                            idkind, flags, id, _dtrace_defattr, 0,
                            &dt_idops_assc, NULL, dtp->dt_gen);
                } else {
                        idp = dt_idhash_insert(dhp, name,
                            idkind, flags, id, _dtrace_defattr, 0,
                            &dt_idops_thaw, NULL, dtp->dt_gen);
                }

                if (idp == NULL)
                        longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);

                /*
                 * Arrays and aggregations are not cooked individually. They
                 * have dynamic types and must be referenced using operator [].
                 * This is handled explicitly by the code for DT_TOK_LBRAC.
                 */
                if (idp->di_kind != DT_IDENT_ARRAY &&
                    idp->di_kind != DT_IDENT_AGG)
                        attr = dt_ident_cook(dnp, idp, NULL);
                else {
                        dt_node_type_assign(dnp,
                            DT_DYN_CTFP(dtp), DT_DYN_TYPE(dtp), B_FALSE);
                        attr = idp->di_attr;
                }

                free(dnp->dn_string);
                dnp->dn_string = NULL;
                dnp->dn_kind = dnkind;
                dnp->dn_ident = idp;
                dnp->dn_flags |= DT_NF_LVALUE | DT_NF_WRITABLE;

                dt_node_attr_assign(dnp, attr);

        } else if (scope != DTRACE_OBJ_EXEC) {
                xyerror(D_IDENT_UNDEF, "failed to resolve %s%s%s: %s\n",
                    dnp->dn_string, mark, name,
                    dtrace_errmsg(dtp, dtrace_errno(dtp)));
        } else {
                xyerror(D_IDENT_UNDEF, "failed to resolve %s: %s\n",
                    dnp->dn_string, dtrace_errmsg(dtp, dtrace_errno(dtp)));
        }
}

static dt_node_t *
dt_cook_ident(dt_node_t *dnp, uint_t idflags)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;

        if (dnp->dn_op == DT_TOK_AGG)
                dt_xcook_ident(dnp, dtp->dt_aggs, DT_IDENT_AGG, B_FALSE);
        else
                dt_xcook_ident(dnp, dtp->dt_globals, DT_IDENT_SCALAR, B_FALSE);

        return (dt_node_cook(dnp, idflags));
}

/*
 * Since operators [ and -> can instantiate new variables before we know
 * whether the reference is for a read or a write, we need to check read
 * references to determine if the identifier is currently dt_ident_unref().
 * If so, we report that this first access was to an undefined variable.
 */
static dt_node_t *
dt_cook_var(dt_node_t *dnp, uint_t idflags)
{
        dt_ident_t *idp = dnp->dn_ident;

        if ((idflags & DT_IDFLG_REF) && dt_ident_unref(idp)) {
                dnerror(dnp, D_VAR_UNDEF,
                    "%s%s has not yet been declared or assigned\n",
                    (idp->di_flags & DT_IDFLG_LOCAL) ? "this->" :
                    (idp->di_flags & DT_IDFLG_TLS) ? "self->" : "",
                    idp->di_name);
        }

        dt_node_attr_assign(dnp, dt_ident_cook(dnp, idp, &dnp->dn_args));
        return (dnp);
}

/*ARGSUSED*/
static dt_node_t *
dt_cook_func(dt_node_t *dnp, uint_t idflags)
{
        dt_node_attr_assign(dnp,
            dt_ident_cook(dnp, dnp->dn_ident, &dnp->dn_args));

        return (dnp);
}

static dt_node_t *
dt_cook_op1(dt_node_t *dnp, uint_t idflags)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        dt_node_t *cp = dnp->dn_child;

        char n[DT_TYPE_NAMELEN];
        dtrace_typeinfo_t dtt;
        dt_ident_t *idp;

        ctf_encoding_t e;
        ctf_arinfo_t r;
        ctf_id_t type, base;
        uint_t kind;

        if (dnp->dn_op == DT_TOK_PREINC || dnp->dn_op == DT_TOK_POSTINC ||
            dnp->dn_op == DT_TOK_PREDEC || dnp->dn_op == DT_TOK_POSTDEC)
                idflags = DT_IDFLG_REF | DT_IDFLG_MOD;
        else
                idflags = DT_IDFLG_REF;

        /*
         * We allow the unary ++ and -- operators to instantiate new scalar
         * variables if applied to an identifier; otherwise just cook as usual.
         */
        if (cp->dn_kind == DT_NODE_IDENT && (idflags & DT_IDFLG_MOD))
                dt_xcook_ident(cp, dtp->dt_globals, DT_IDENT_SCALAR, B_TRUE);

        cp = dnp->dn_child = dt_node_cook(cp, 0); /* don't set idflags yet */

        if (cp->dn_kind == DT_NODE_VAR && dt_ident_unref(cp->dn_ident)) {
                if (dt_type_lookup("int64_t", &dtt) != 0)
                        xyerror(D_TYPE_ERR, "failed to lookup int64_t\n");

                dt_ident_type_assign(cp->dn_ident, dtt.dtt_ctfp, dtt.dtt_type);
                dt_node_type_assign(cp, dtt.dtt_ctfp, dtt.dtt_type,
                    dtt.dtt_flags & DTT_FL_USER ? B_TRUE : B_FALSE);
        }

        if (cp->dn_kind == DT_NODE_VAR)
                cp->dn_ident->di_flags |= idflags;

        switch (dnp->dn_op) {
        case DT_TOK_DEREF:
                /*
                 * If the deref operator is applied to a translated pointer,
                 * we set our output type to the output of the translation.
                 */
                if ((idp = dt_node_resolve(cp, DT_IDENT_XLPTR)) != NULL) {
                        dt_xlator_t *dxp = idp->di_data;

                        dnp->dn_ident = &dxp->dx_souid;
                        dt_node_type_assign(dnp,
                            dnp->dn_ident->di_ctfp, dnp->dn_ident->di_type,
                            cp->dn_flags & DT_NF_USERLAND);
                        break;
                }

                type = ctf_type_resolve(cp->dn_ctfp, cp->dn_type);
                kind = ctf_type_kind(cp->dn_ctfp, type);

                if (kind == CTF_K_ARRAY) {
                        if (ctf_array_info(cp->dn_ctfp, type, &r) != 0) {
                                dtp->dt_ctferr = ctf_errno(cp->dn_ctfp);
                                longjmp(yypcb->pcb_jmpbuf, EDT_CTF);
                        } else
                                type = r.ctr_contents;
                } else if (kind == CTF_K_POINTER) {
                        type = ctf_type_reference(cp->dn_ctfp, type);
                } else {
                        xyerror(D_DEREF_NONPTR,
                            "cannot dereference non-pointer type\n");
                }

                dt_node_type_assign(dnp, cp->dn_ctfp, type,
                    cp->dn_flags & DT_NF_USERLAND);
                base = ctf_type_resolve(cp->dn_ctfp, type);
                kind = ctf_type_kind(cp->dn_ctfp, base);

                if (kind == CTF_K_INTEGER && ctf_type_encoding(cp->dn_ctfp,
                    base, &e) == 0 && IS_VOID(e)) {
                        xyerror(D_DEREF_VOID,
                            "cannot dereference pointer to void\n");
                }

                if (kind == CTF_K_FUNCTION) {
                        xyerror(D_DEREF_FUNC,
                            "cannot dereference pointer to function\n");
                }

                if (kind != CTF_K_ARRAY || dt_node_is_string(dnp))
                        dnp->dn_flags |= DT_NF_LVALUE; /* see K&R[A7.4.3] */

                /*
                 * If we propagated the l-value bit and the child operand was
                 * a writable D variable or a binary operation of the form
                 * a + b where a is writable, then propagate the writable bit.
                 * This is necessary to permit assignments to scalar arrays,
                 * which are converted to expressions of the form *(a + i).
                 */
                if ((cp->dn_flags & DT_NF_WRITABLE) ||
                    (cp->dn_kind == DT_NODE_OP2 && cp->dn_op == DT_TOK_ADD &&
                    (cp->dn_left->dn_flags & DT_NF_WRITABLE)))
                        dnp->dn_flags |= DT_NF_WRITABLE;

                if ((cp->dn_flags & DT_NF_USERLAND) &&
                    (kind == CTF_K_POINTER || (dnp->dn_flags & DT_NF_REF)))
                        dnp->dn_flags |= DT_NF_USERLAND;
                break;

        case DT_TOK_IPOS:
        case DT_TOK_INEG:
                if (!dt_node_is_arith(cp)) {
                        xyerror(D_OP_ARITH, "operator %s requires an operand "
                            "of arithmetic type\n", opstr(dnp->dn_op));
                }
                dt_node_type_propagate(cp, dnp); /* see K&R[A7.4.4-6] */
                break;

        case DT_TOK_BNEG:
                if (!dt_node_is_integer(cp)) {
                        xyerror(D_OP_INT, "operator %s requires an operand of "
                            "integral type\n", opstr(dnp->dn_op));
                }
                dt_node_type_propagate(cp, dnp); /* see K&R[A7.4.4-6] */
                break;

        case DT_TOK_LNEG:
                if (!dt_node_is_scalar(cp)) {
                        xyerror(D_OP_SCALAR, "operator %s requires an operand "
                            "of scalar type\n", opstr(dnp->dn_op));
                }
                dt_node_type_assign(dnp, DT_INT_CTFP(dtp), DT_INT_TYPE(dtp),
                    B_FALSE);
                break;

        case DT_TOK_ADDROF:
                if (cp->dn_kind == DT_NODE_VAR || cp->dn_kind == DT_NODE_AGG) {
                        xyerror(D_ADDROF_VAR,
                            "cannot take address of dynamic variable\n");
                }

                if (dt_node_is_dynamic(cp)) {
                        xyerror(D_ADDROF_VAR,
                            "cannot take address of dynamic object\n");
                }

                if (!(cp->dn_flags & DT_NF_LVALUE)) {
                        xyerror(D_ADDROF_LVAL, /* see K&R[A7.4.2] */
                            "unacceptable operand for unary & operator\n");
                }

                if (cp->dn_flags & DT_NF_BITFIELD) {
                        xyerror(D_ADDROF_BITFIELD,
                            "cannot take address of bit-field\n");
                }

                dtt.dtt_object = NULL;
                dtt.dtt_ctfp = cp->dn_ctfp;
                dtt.dtt_type = cp->dn_type;

                if (dt_type_pointer(&dtt) == -1) {
                        xyerror(D_TYPE_ERR, "cannot find type for \"&\": %s*\n",
                            dt_node_type_name(cp, n, sizeof (n)));
                }

                dt_node_type_assign(dnp, dtt.dtt_ctfp, dtt.dtt_type,
                    cp->dn_flags & DT_NF_USERLAND);
                break;

        case DT_TOK_SIZEOF:
                if (cp->dn_flags & DT_NF_BITFIELD) {
                        xyerror(D_SIZEOF_BITFIELD,
                            "cannot apply sizeof to a bit-field\n");
                }

                if (dt_node_sizeof(cp) == 0) {
                        xyerror(D_SIZEOF_TYPE, "cannot apply sizeof to an "
                            "operand of unknown size\n");
                }

                dt_node_type_assign(dnp, dtp->dt_ddefs->dm_ctfp,
                    ctf_lookup_by_name(dtp->dt_ddefs->dm_ctfp, "size_t"),
                    B_FALSE);
                break;

        case DT_TOK_STRINGOF:
                if (!dt_node_is_scalar(cp) && !dt_node_is_pointer(cp) &&
                    !dt_node_is_strcompat(cp)) {
                        xyerror(D_STRINGOF_TYPE,
                            "cannot apply stringof to a value of type %s\n",
                            dt_node_type_name(cp, n, sizeof (n)));
                }
                dt_node_type_assign(dnp, DT_STR_CTFP(dtp), DT_STR_TYPE(dtp),
                    cp->dn_flags & DT_NF_USERLAND);
                break;

        case DT_TOK_PREINC:
        case DT_TOK_POSTINC:
        case DT_TOK_PREDEC:
        case DT_TOK_POSTDEC:
                if (dt_node_is_scalar(cp) == 0) {
                        xyerror(D_OP_SCALAR, "operator %s requires operand of "
                            "scalar type\n", opstr(dnp->dn_op));
                }

                if (dt_node_is_vfptr(cp)) {
                        xyerror(D_OP_VFPTR, "operator %s requires an operand "
                            "of known size\n", opstr(dnp->dn_op));
                }

                if (!(cp->dn_flags & DT_NF_LVALUE)) {
                        xyerror(D_OP_LVAL, "operator %s requires modifiable "
                            "lvalue as an operand\n", opstr(dnp->dn_op));
                }

                if (!(cp->dn_flags & DT_NF_WRITABLE)) {
                        xyerror(D_OP_WRITE, "operator %s can only be applied "
                            "to a writable variable\n", opstr(dnp->dn_op));
                }

                dt_node_type_propagate(cp, dnp); /* see K&R[A7.4.1] */
                break;

        default:
                xyerror(D_UNKNOWN, "invalid unary op %s\n", opstr(dnp->dn_op));
        }

        dt_node_attr_assign(dnp, cp->dn_attr);
        return (dnp);
}

static void
dt_assign_common(dt_node_t *dnp)
{
        dt_node_t *lp = dnp->dn_left;
        dt_node_t *rp = dnp->dn_right;
        int op = dnp->dn_op;

        if (rp->dn_kind == DT_NODE_INT)
                dt_cast(lp, rp);

        if (!(lp->dn_flags & DT_NF_LVALUE)) {
                xyerror(D_OP_LVAL, "operator %s requires modifiable "
                    "lvalue as an operand\n", opstr(op));
                /* see K&R[A7.17] */
        }

        if (!(lp->dn_flags & DT_NF_WRITABLE)) {
                xyerror(D_OP_WRITE, "operator %s can only be applied "
                    "to a writable variable\n", opstr(op));
        }

        dt_node_type_propagate(lp, dnp); /* see K&R[A7.17] */
        dt_node_attr_assign(dnp, dt_attr_min(lp->dn_attr, rp->dn_attr));
}

static dt_node_t *
dt_cook_op2(dt_node_t *dnp, uint_t idflags)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        dt_node_t *lp = dnp->dn_left;
        dt_node_t *rp = dnp->dn_right;
        int op = dnp->dn_op;

        ctf_membinfo_t m;
        ctf_file_t *ctfp;
        ctf_id_t type;
        int kind, val, uref;
        dt_ident_t *idp;

        char n1[DT_TYPE_NAMELEN];
        char n2[DT_TYPE_NAMELEN];

        /*
         * The expression E1[E2] is identical by definition to *((E1)+(E2)) so
         * we convert "[" to "+" and glue on "*" at the end (see K&R[A7.3.1])
         * unless the left-hand side is an untyped D scalar, associative array,
         * or aggregation.  In these cases, we proceed to case DT_TOK_LBRAC and
         * handle associative array and aggregation references there.
         */
        if (op == DT_TOK_LBRAC) {
                if (lp->dn_kind == DT_NODE_IDENT) {
                        dt_idhash_t *dhp;
                        uint_t idkind;

                        if (lp->dn_op == DT_TOK_AGG) {
                                dhp = dtp->dt_aggs;
                                idp = dt_idhash_lookup(dhp, lp->dn_string + 1);
                                idkind = DT_IDENT_AGG;
                        } else {
                                dhp = dtp->dt_globals;
                                idp = dt_idstack_lookup(
                                    &yypcb->pcb_globals, lp->dn_string);
                                idkind = DT_IDENT_ARRAY;
                        }

                        if (idp == NULL || dt_ident_unref(idp))
                                dt_xcook_ident(lp, dhp, idkind, B_TRUE);
                        else
                                dt_xcook_ident(lp, dhp, idp->di_kind, B_FALSE);
                } else {
                        lp = dnp->dn_left = dt_node_cook(lp, 0);
                }

                /*
                 * Switch op to '+' for *(E1 + E2) array mode in these cases:
                 * (a) lp is a DT_IDENT_ARRAY variable that has already been
                 *      referenced using [] notation (dn_args != NULL).
                 * (b) lp is a non-ARRAY variable that has already been given
                 *      a type by assignment or declaration (!dt_ident_unref())
                 * (c) lp is neither a variable nor an aggregation
                 */
                if (lp->dn_kind == DT_NODE_VAR) {
                        if (lp->dn_ident->di_kind == DT_IDENT_ARRAY) {
                                if (lp->dn_args != NULL)
                                        op = DT_TOK_ADD;
                        } else if (!dt_ident_unref(lp->dn_ident)) {
                                op = DT_TOK_ADD;
                        }
                } else if (lp->dn_kind != DT_NODE_AGG) {
                        op = DT_TOK_ADD;
                }
        }

        switch (op) {
        case DT_TOK_BAND:
        case DT_TOK_XOR:
        case DT_TOK_BOR:
                lp = dnp->dn_left = dt_node_cook(lp, DT_IDFLG_REF);
                rp = dnp->dn_right = dt_node_cook(rp, DT_IDFLG_REF);

                if (!dt_node_is_integer(lp) || !dt_node_is_integer(rp)) {
                        xyerror(D_OP_INT, "operator %s requires operands of "
                            "integral type\n", opstr(op));
                }

                dt_node_promote(lp, rp, dnp); /* see K&R[A7.11-13] */
                break;

        case DT_TOK_LSH:
        case DT_TOK_RSH:
                lp = dnp->dn_left = dt_node_cook(lp, DT_IDFLG_REF);
                rp = dnp->dn_right = dt_node_cook(rp, DT_IDFLG_REF);

                if (!dt_node_is_integer(lp) || !dt_node_is_integer(rp)) {
                        xyerror(D_OP_INT, "operator %s requires operands of "
                            "integral type\n", opstr(op));
                }

                dt_node_type_propagate(lp, dnp); /* see K&R[A7.8] */
                dt_node_attr_assign(dnp, dt_attr_min(lp->dn_attr, rp->dn_attr));
                break;

        case DT_TOK_MOD:
                lp = dnp->dn_left = dt_node_cook(lp, DT_IDFLG_REF);
                rp = dnp->dn_right = dt_node_cook(rp, DT_IDFLG_REF);

                if (!dt_node_is_integer(lp) || !dt_node_is_integer(rp)) {
                        xyerror(D_OP_INT, "operator %s requires operands of "
                            "integral type\n", opstr(op));
                }

                dt_node_promote(lp, rp, dnp); /* see K&R[A7.6] */
                break;

        case DT_TOK_MUL:
        case DT_TOK_DIV:
                lp = dnp->dn_left = dt_node_cook(lp, DT_IDFLG_REF);
                rp = dnp->dn_right = dt_node_cook(rp, DT_IDFLG_REF);

                if (!dt_node_is_arith(lp) || !dt_node_is_arith(rp)) {
                        xyerror(D_OP_ARITH, "operator %s requires operands of "
                            "arithmetic type\n", opstr(op));
                }

                dt_node_promote(lp, rp, dnp); /* see K&R[A7.6] */
                break;

        case DT_TOK_LAND:
        case DT_TOK_LXOR:
        case DT_TOK_LOR:
                lp = dnp->dn_left = dt_node_cook(lp, DT_IDFLG_REF);
                rp = dnp->dn_right = dt_node_cook(rp, DT_IDFLG_REF);

                if (!dt_node_is_scalar(lp) || !dt_node_is_scalar(rp)) {
                        xyerror(D_OP_SCALAR, "operator %s requires operands "
                            "of scalar type\n", opstr(op));
                }

                dt_node_type_assign(dnp, DT_INT_CTFP(dtp), DT_INT_TYPE(dtp),
                    B_FALSE);
                dt_node_attr_assign(dnp, dt_attr_min(lp->dn_attr, rp->dn_attr));
                break;

        case DT_TOK_LT:
        case DT_TOK_LE:
        case DT_TOK_GT:
        case DT_TOK_GE:
        case DT_TOK_EQU:
        case DT_TOK_NEQ:
                /*
                 * The D comparison operators provide the ability to transform
                 * a right-hand identifier into a corresponding enum tag value
                 * if the left-hand side is an enum type.  To do this, we cook
                 * the left-hand side, and then see if the right-hand side is
                 * an unscoped identifier defined in the enum.  If so, we
                 * convert into an integer constant node with the tag's value.
                 */
                lp = dnp->dn_left = dt_node_cook(lp, DT_IDFLG_REF);

                kind = ctf_type_kind(lp->dn_ctfp,
                    ctf_type_resolve(lp->dn_ctfp, lp->dn_type));

                if (kind == CTF_K_ENUM && rp->dn_kind == DT_NODE_IDENT &&
                    strchr(rp->dn_string, '`') == NULL && ctf_enum_value(
                    lp->dn_ctfp, lp->dn_type, rp->dn_string, &val) == 0) {

                        if ((idp = dt_idstack_lookup(&yypcb->pcb_globals,
                            rp->dn_string)) != NULL) {
                                xyerror(D_IDENT_AMBIG,
                                    "ambiguous use of operator %s: %s is "
                                    "both a %s enum tag and a global %s\n",
                                    opstr(op), rp->dn_string,
                                    dt_node_type_name(lp, n1, sizeof (n1)),
                                    dt_idkind_name(idp->di_kind));
                        }

                        free(rp->dn_string);
                        rp->dn_string = NULL;
                        rp->dn_kind = DT_NODE_INT;
                        rp->dn_flags |= DT_NF_COOKED;
                        rp->dn_op = DT_TOK_INT;
                        rp->dn_value = (intmax_t)val;

                        dt_node_type_assign(rp, lp->dn_ctfp, lp->dn_type,
                            B_FALSE);
                        dt_node_attr_assign(rp, _dtrace_symattr);
                }

                rp = dnp->dn_right = dt_node_cook(rp, DT_IDFLG_REF);

                /*
                 * The rules for type checking for the relational operators are
                 * described in the ANSI-C spec (see K&R[A7.9-10]).  We perform
                 * the various tests in order from least to most expensive.  We
                 * also allow derived strings to be compared as a first-class
                 * type (resulting in a strcmp(3C)-style comparison), and we
                 * slightly relax the A7.9 rules to permit void pointer
                 * comparisons as in A7.10.  Our users won't be confused by
                 * this since they understand pointers are just numbers, and
                 * relaxing this constraint simplifies the implementation.
                 */
                if (ctf_type_compat(lp->dn_ctfp, lp->dn_type,
                    rp->dn_ctfp, rp->dn_type))
                        /*EMPTY*/;
                else if (dt_node_is_integer(lp) && dt_node_is_integer(rp))
                        /*EMPTY*/;
                else if (dt_node_is_strcompat(lp) && dt_node_is_strcompat(rp) &&
                    (dt_node_is_string(lp) || dt_node_is_string(rp)))
                        /*EMPTY*/;
                else if (dt_node_is_ptrcompat(lp, rp, NULL, NULL) == 0) {
                        xyerror(D_OP_INCOMPAT, "operands have "
                            "incompatible types: \"%s\" %s \"%s\"\n",
                            dt_node_type_name(lp, n1, sizeof (n1)), opstr(op),
                            dt_node_type_name(rp, n2, sizeof (n2)));
                }

                dt_node_type_assign(dnp, DT_INT_CTFP(dtp), DT_INT_TYPE(dtp),
                    B_FALSE);
                dt_node_attr_assign(dnp, dt_attr_min(lp->dn_attr, rp->dn_attr));
                break;

        case DT_TOK_ADD:
        case DT_TOK_SUB: {
                /*
                 * The rules for type checking for the additive operators are
                 * described in the ANSI-C spec (see K&R[A7.7]).  Pointers and
                 * integers may be manipulated according to specific rules.  In
                 * these cases D permits strings to be treated as pointers.
                 */
                int lp_is_ptr, lp_is_int, rp_is_ptr, rp_is_int;

                lp = dnp->dn_left = dt_node_cook(lp, DT_IDFLG_REF);
                rp = dnp->dn_right = dt_node_cook(rp, DT_IDFLG_REF);

                lp_is_ptr = dt_node_is_string(lp) ||
                    (dt_node_is_pointer(lp) && !dt_node_is_vfptr(lp));
                lp_is_int = dt_node_is_integer(lp);

                rp_is_ptr = dt_node_is_string(rp) ||
                    (dt_node_is_pointer(rp) && !dt_node_is_vfptr(rp));
                rp_is_int = dt_node_is_integer(rp);

                if (lp_is_int && rp_is_int) {
                        dt_type_promote(lp, rp, &ctfp, &type);
                        uref = 0;
                } else if (lp_is_ptr && rp_is_int) {
                        ctfp = lp->dn_ctfp;
                        type = lp->dn_type;
                        uref = lp->dn_flags & DT_NF_USERLAND;
                } else if (lp_is_int && rp_is_ptr && op == DT_TOK_ADD) {
                        ctfp = rp->dn_ctfp;
                        type = rp->dn_type;
                        uref = rp->dn_flags & DT_NF_USERLAND;
                } else if (lp_is_ptr && rp_is_ptr && op == DT_TOK_SUB &&
                    dt_node_is_ptrcompat(lp, rp, NULL, NULL)) {
                        ctfp = dtp->dt_ddefs->dm_ctfp;
                        type = ctf_lookup_by_name(ctfp, "ptrdiff_t");
                        uref = 0;
                } else {
                        xyerror(D_OP_INCOMPAT, "operands have incompatible "
                            "types: \"%s\" %s \"%s\"\n",
                            dt_node_type_name(lp, n1, sizeof (n1)), opstr(op),
                            dt_node_type_name(rp, n2, sizeof (n2)));
                }

                dt_node_type_assign(dnp, ctfp, type, B_FALSE);
                dt_node_attr_assign(dnp, dt_attr_min(lp->dn_attr, rp->dn_attr));

                if (uref)
                        dnp->dn_flags |= DT_NF_USERLAND;
                break;
        }

        case DT_TOK_OR_EQ:
        case DT_TOK_XOR_EQ:
        case DT_TOK_AND_EQ:
        case DT_TOK_LSH_EQ:
        case DT_TOK_RSH_EQ:
        case DT_TOK_MOD_EQ:
                if (lp->dn_kind == DT_NODE_IDENT) {
                        dt_xcook_ident(lp, dtp->dt_globals,
                            DT_IDENT_SCALAR, B_TRUE);
                }

                lp = dnp->dn_left =
                    dt_node_cook(lp, DT_IDFLG_REF | DT_IDFLG_MOD);

                rp = dnp->dn_right =
                    dt_node_cook(rp, DT_IDFLG_REF | DT_IDFLG_MOD);

                if (!dt_node_is_integer(lp) || !dt_node_is_integer(rp)) {
                        xyerror(D_OP_INT, "operator %s requires operands of "
                            "integral type\n", opstr(op));
                }
                goto asgn_common;

        case DT_TOK_MUL_EQ:
        case DT_TOK_DIV_EQ:
                if (lp->dn_kind == DT_NODE_IDENT) {
                        dt_xcook_ident(lp, dtp->dt_globals,
                            DT_IDENT_SCALAR, B_TRUE);
                }

                lp = dnp->dn_left =
                    dt_node_cook(lp, DT_IDFLG_REF | DT_IDFLG_MOD);

                rp = dnp->dn_right =
                    dt_node_cook(rp, DT_IDFLG_REF | DT_IDFLG_MOD);

                if (!dt_node_is_arith(lp) || !dt_node_is_arith(rp)) {
                        xyerror(D_OP_ARITH, "operator %s requires operands of "
                            "arithmetic type\n", opstr(op));
                }
                goto asgn_common;

        case DT_TOK_ASGN:
                /*
                 * If the left-hand side is an identifier, attempt to resolve
                 * it as either an aggregation or scalar variable.  We pass
                 * B_TRUE to dt_xcook_ident to indicate that a new variable can
                 * be created if no matching variable exists in the namespace.
                 */
                if (lp->dn_kind == DT_NODE_IDENT) {
                        if (lp->dn_op == DT_TOK_AGG) {
                                dt_xcook_ident(lp, dtp->dt_aggs,
                                    DT_IDENT_AGG, B_TRUE);
                        } else {
                                dt_xcook_ident(lp, dtp->dt_globals,
                                    DT_IDENT_SCALAR, B_TRUE);
                        }
                }

                lp = dnp->dn_left = dt_node_cook(lp, 0); /* don't set mod yet */
                rp = dnp->dn_right = dt_node_cook(rp, DT_IDFLG_REF);

                /*
                 * If the left-hand side is an aggregation, verify that we are
                 * assigning it the result of an aggregating function.  Once
                 * we've done so, hide the func node in the aggregation and
                 * return the aggregation itself up to the parse tree parent.
                 * This transformation is legal since the assigned function
                 * cannot change identity across disjoint cooking passes and
                 * the argument list subtree is retained for later cooking.
                 */
                if (lp->dn_kind == DT_NODE_AGG) {
                        const char *aname = lp->dn_ident->di_name;
                        dt_ident_t *oid = lp->dn_ident->di_iarg;

                        if (rp->dn_kind != DT_NODE_FUNC ||
                            rp->dn_ident->di_kind != DT_IDENT_AGGFUNC) {
                                xyerror(D_AGG_FUNC,
                                    "@%s must be assigned the result of "
                                    "an aggregating function\n", aname);
                        }

                        if (oid != NULL && oid != rp->dn_ident) {
                                xyerror(D_AGG_REDEF,
                                    "aggregation redefined: @%s\n\t "
                                    "current: @%s = %s( )\n\tprevious: @%s = "
                                    "%s( ) : line %d\n", aname, aname,
                                    rp->dn_ident->di_name, aname, oid->di_name,
                                    lp->dn_ident->di_lineno);
                        } else if (oid == NULL)
                                lp->dn_ident->di_iarg = rp->dn_ident;

                        /*
                         * Do not allow multiple aggregation assignments in a
                         * single statement, e.g. (@a = count()) = count();
                         * We produce a message as if the result of aggregating
                         * function does not propagate DT_NF_LVALUE.
                         */
                        if (lp->dn_aggfun != NULL) {
                                xyerror(D_OP_LVAL, "operator = requires "
                                    "modifiable lvalue as an operand\n");
                        }

                        lp->dn_aggfun = rp;
                        lp = dt_node_cook(lp, DT_IDFLG_MOD);

                        dnp->dn_left = dnp->dn_right = NULL;
                        dt_node_free(dnp);

                        return (lp);
                }

                /*
                 * If the right-hand side is a dynamic variable that is the
                 * output of a translator, our result is the translated type.
                 */
                if ((idp = dt_node_resolve(rp, DT_IDENT_XLSOU)) != NULL) {
                        ctfp = idp->di_ctfp;
                        type = idp->di_type;
                        uref = idp->di_flags & DT_IDFLG_USER;
                } else {
                        ctfp = rp->dn_ctfp;
                        type = rp->dn_type;
                        uref = rp->dn_flags & DT_NF_USERLAND;
                }

                /*
                 * If the left-hand side of an assignment statement is a virgin
                 * variable created by this compilation pass, reset the type of
                 * this variable to the type of the right-hand side.
                 */
                if (lp->dn_kind == DT_NODE_VAR &&
                    dt_ident_unref(lp->dn_ident)) {
                        dt_node_type_assign(lp, ctfp, type, B_FALSE);
                        dt_ident_type_assign(lp->dn_ident, ctfp, type);

                        if (uref) {
                                lp->dn_flags |= DT_NF_USERLAND;
                                lp->dn_ident->di_flags |= DT_IDFLG_USER;
                        }
                }

                if (lp->dn_kind == DT_NODE_VAR)
                        lp->dn_ident->di_flags |= DT_IDFLG_MOD;

                /*
                 * The rules for type checking for the assignment operators are
                 * described in the ANSI-C spec (see K&R[A7.17]).  We share
                 * most of this code with the argument list checking code.
                 */
                if (!dt_node_is_string(lp)) {
                        kind = ctf_type_kind(lp->dn_ctfp,
                            ctf_type_resolve(lp->dn_ctfp, lp->dn_type));

                        if (kind == CTF_K_ARRAY || kind == CTF_K_FUNCTION) {
                                xyerror(D_OP_ARRFUN, "operator %s may not be "
                                    "applied to operand of type \"%s\"\n",
                                    opstr(op),
                                    dt_node_type_name(lp, n1, sizeof (n1)));
                        }
                }

                if (idp != NULL && idp->di_kind == DT_IDENT_XLSOU &&
                    ctf_type_compat(lp->dn_ctfp, lp->dn_type, ctfp, type))
                        goto asgn_common;

                if (dt_node_is_argcompat(lp, rp))
                        goto asgn_common;

                xyerror(D_OP_INCOMPAT,
                    "operands have incompatible types: \"%s\" %s \"%s\"\n",
                    dt_node_type_name(lp, n1, sizeof (n1)), opstr(op),
                    dt_node_type_name(rp, n2, sizeof (n2)));
                /*NOTREACHED*/

        case DT_TOK_ADD_EQ:
        case DT_TOK_SUB_EQ:
                if (lp->dn_kind == DT_NODE_IDENT) {
                        dt_xcook_ident(lp, dtp->dt_globals,
                            DT_IDENT_SCALAR, B_TRUE);
                }

                lp = dnp->dn_left =
                    dt_node_cook(lp, DT_IDFLG_REF | DT_IDFLG_MOD);

                rp = dnp->dn_right =
                    dt_node_cook(rp, DT_IDFLG_REF | DT_IDFLG_MOD);

                if (dt_node_is_string(lp) || dt_node_is_string(rp)) {
                        xyerror(D_OP_INCOMPAT, "operands have "
                            "incompatible types: \"%s\" %s \"%s\"\n",
                            dt_node_type_name(lp, n1, sizeof (n1)), opstr(op),
                            dt_node_type_name(rp, n2, sizeof (n2)));
                }

                /*
                 * The rules for type checking for the assignment operators are
                 * described in the ANSI-C spec (see K&R[A7.17]).  To these
                 * rules we add that only writable D nodes can be modified.
                 */
                if (dt_node_is_integer(lp) == 0 ||
                    dt_node_is_integer(rp) == 0) {
                        if (!dt_node_is_pointer(lp) || dt_node_is_vfptr(lp)) {
                                xyerror(D_OP_VFPTR,
                                    "operator %s requires left-hand scalar "
                                    "operand of known size\n", opstr(op));
                        } else if (dt_node_is_integer(rp) == 0 &&
                            dt_node_is_ptrcompat(lp, rp, NULL, NULL) == 0) {
                                xyerror(D_OP_INCOMPAT, "operands have "
                                    "incompatible types: \"%s\" %s \"%s\"\n",
                                    dt_node_type_name(lp, n1, sizeof (n1)),
                                    opstr(op),
                                    dt_node_type_name(rp, n2, sizeof (n2)));
                        }
                }
asgn_common:
                dt_assign_common(dnp);
                break;

        case DT_TOK_PTR:
                /*
                 * If the left-hand side of operator -> is one of the scoping
                 * keywords, permit a local or thread variable to be created or
                 * referenced.
                 */
                if (lp->dn_kind == DT_NODE_IDENT) {
                        dt_idhash_t *dhp = NULL;

                        if (strcmp(lp->dn_string, "self") == 0) {
                                dhp = dtp->dt_tls;
                        } else if (strcmp(lp->dn_string, "this") == 0) {
                                dhp = yypcb->pcb_locals;
                        }
                        if (dhp != NULL) {
                                if (rp->dn_kind != DT_NODE_VAR) {
                                        dt_xcook_ident(rp, dhp,
                                            DT_IDENT_SCALAR, B_TRUE);
                                }

                                if (idflags != 0)
                                        rp = dt_node_cook(rp, idflags);

                                /* avoid freeing rp */
                                dnp->dn_right = dnp->dn_left;
                                dt_node_free(dnp);
                                return (rp);
                        }
                }
                /*FALLTHRU*/
        case DT_TOK_DOT:
                lp = dnp->dn_left = dt_node_cook(lp, DT_IDFLG_REF);

                if (rp->dn_kind != DT_NODE_IDENT) {
                        xyerror(D_OP_IDENT, "operator %s must be followed by "
                            "an identifier\n", opstr(op));
                }

                if ((idp = dt_node_resolve(lp, DT_IDENT_XLSOU)) != NULL ||
                    (idp = dt_node_resolve(lp, DT_IDENT_XLPTR)) != NULL) {
                        /*
                         * If the left-hand side is a translated struct or ptr,
                         * the type of the left is the translation output type.
                         */
                        dt_xlator_t *dxp = idp->di_data;

                        if (dt_xlator_member(dxp, rp->dn_string) == NULL) {
                                xyerror(D_XLATE_NOCONV,
                                    "translator does not define conversion "
                                    "for member: %s\n", rp->dn_string);
                        }

                        ctfp = idp->di_ctfp;
                        type = ctf_type_resolve(ctfp, idp->di_type);
                        uref = idp->di_flags & DT_IDFLG_USER;
                } else {
                        ctfp = lp->dn_ctfp;
                        type = ctf_type_resolve(ctfp, lp->dn_type);
                        uref = lp->dn_flags & DT_NF_USERLAND;
                }

                kind = ctf_type_kind(ctfp, type);

                if (op == DT_TOK_PTR) {
                        if (kind != CTF_K_POINTER) {
                                xyerror(D_OP_PTR, "operator %s must be "
                                    "applied to a pointer\n", opstr(op));
                        }
                        type = ctf_type_reference(ctfp, type);
                        type = ctf_type_resolve(ctfp, type);
                        kind = ctf_type_kind(ctfp, type);
                }

                /*
                 * If we follow a reference to a forward declaration tag,
                 * search the entire type space for the actual definition.
                 */
                dt_resolve_forward_decl(&ctfp, &type);
                kind = ctf_type_kind(ctfp, type);

                if (kind == CTF_K_FORWARD) {
                        xyerror(D_OP_INCOMPLETE,
                            "operator %s cannot be applied to a "
                            "forward declaration: no %s definition "
                            "is available\n", opstr(op),
                            ctf_type_name(ctfp, type, n1, sizeof (n1)));
                } else if (kind != CTF_K_STRUCT && kind != CTF_K_UNION) {
                        if (op == DT_TOK_PTR) {
                                xyerror(D_OP_SOU, "operator -> cannot be "
                                    "applied to pointer to type \"%s\"; must "
                                    "be applied to a struct or union pointer\n",
                                    ctf_type_name(ctfp, type, n1, sizeof (n1)));
                        } else {
                                xyerror(D_OP_SOU, "operator %s cannot be "
                                    "applied to type \"%s\"; must be applied "
                                    "to a struct or union\n", opstr(op),
                                    ctf_type_name(ctfp, type, n1, sizeof (n1)));
                        }
                }

                if (ctf_member_info(ctfp, type, rp->dn_string, &m) == CTF_ERR) {
                        xyerror(D_TYPE_MEMBER,
                            "%s is not a member of %s\n", rp->dn_string,
                            ctf_type_name(ctfp, type, n1, sizeof (n1)));
                }

                type = m.ctm_type;

                dt_resolve_forward_decl(&ctfp, &type);
                dt_node_type_assign(dnp, ctfp, type, B_FALSE);
                dt_node_attr_assign(dnp, lp->dn_attr);

                type = ctf_type_resolve(ctfp, type);
                kind = ctf_type_kind(ctfp, type);

                if (op == DT_TOK_PTR && (kind != CTF_K_ARRAY ||
                    dt_node_is_string(dnp)))
                        dnp->dn_flags |= DT_NF_LVALUE; /* see K&R[A7.3.3] */

                if (op == DT_TOK_DOT && (lp->dn_flags & DT_NF_LVALUE) &&
                    (kind != CTF_K_ARRAY || dt_node_is_string(dnp)))
                        dnp->dn_flags |= DT_NF_LVALUE; /* see K&R[A7.3.3] */

                if (lp->dn_flags & DT_NF_WRITABLE)
                        dnp->dn_flags |= DT_NF_WRITABLE;

                if (uref && (kind == CTF_K_POINTER ||
                    (dnp->dn_flags & DT_NF_REF)))
                        dnp->dn_flags |= DT_NF_USERLAND;
                break;

        case DT_TOK_LBRAC: {
                /*
                 * If op is DT_TOK_LBRAC, we know from the special-case code at
                 * the top that lp is either a D variable or an aggregation.
                 */
                dt_node_t *lnp;

                /*
                 * If the left-hand side is an aggregation, just set dn_aggtup
                 * to the right-hand side and return the cooked aggregation.
                 * This transformation is legal since we are just collapsing
                 * nodes to simplify later processing, and the entire aggtup
                 * parse subtree is retained for subsequent cooking passes.
                 */
                if (lp->dn_kind == DT_NODE_AGG) {
                        if (lp->dn_aggtup != NULL) {
                                xyerror(D_AGG_MDIM, "improper attempt to "
                                    "reference @%s as a multi-dimensional "
                                    "array\n", lp->dn_ident->di_name);
                        }

                        lp->dn_aggtup = rp;
                        lp = dt_node_cook(lp, 0);

                        dnp->dn_left = dnp->dn_right = NULL;
                        dt_node_free(dnp);

                        return (lp);
                }

                assert(lp->dn_kind == DT_NODE_VAR);
                idp = lp->dn_ident;

                /*
                 * If the left-hand side is a non-global scalar that hasn't yet
                 * been referenced or modified, it was just created by self->
                 * or this-> and we can convert it from scalar to assoc array.
                 */
                if (idp->di_kind == DT_IDENT_SCALAR && dt_ident_unref(idp) &&
                    (idp->di_flags & (DT_IDFLG_LOCAL | DT_IDFLG_TLS)) != 0) {

                        if (idp->di_flags & DT_IDFLG_LOCAL) {
                                xyerror(D_ARR_LOCAL,
                                    "local variables may not be used as "
                                    "associative arrays: %s\n", idp->di_name);
                        }

                        dt_dprintf("morph variable %s (id %u) from scalar to "
                            "array\n", idp->di_name, idp->di_id);

                        dt_ident_morph(idp, DT_IDENT_ARRAY,
                            &dt_idops_assc, NULL);
                }

                if (idp->di_kind != DT_IDENT_ARRAY) {
                        xyerror(D_IDENT_BADREF, "%s '%s' may not be referenced "
                            "as %s\n", dt_idkind_name(idp->di_kind),
                            idp->di_name, dt_idkind_name(DT_IDENT_ARRAY));
                }

                /*
                 * Now that we've confirmed our left-hand side is a DT_NODE_VAR
                 * of idkind DT_IDENT_ARRAY, we need to splice the [ node from
                 * the parse tree and leave a cooked DT_NODE_VAR in its place
                 * where dn_args for the VAR node is the right-hand 'rp' tree,
                 * as shown in the parse tree diagram below:
                 *
                 *        /                         /
                 * [ OP2 "[" ]=dnp              [ VAR ]=dnp
                 *       /      \         =>       |
                 *      /        \                 +- dn_args -> [ ??? ]=rp
                 * [ VAR ]=lp  [ ??? ]=rp
                 *
                 * Since the final dt_node_cook(dnp) can fail using longjmp we
                 * must perform the transformations as a group first by over-
                 * writing 'dnp' to become the VAR node, so that the parse tree
                 * is guaranteed to be in a consistent state if the cook fails.
                 */
                assert(lp->dn_kind == DT_NODE_VAR);
                assert(lp->dn_args == NULL);

                lnp = dnp->dn_link;
                bcopy(lp, dnp, sizeof (dt_node_t));
                dnp->dn_link = lnp;

                dnp->dn_args = rp;
                dnp->dn_list = NULL;

                dt_node_free(lp);
                return (dt_node_cook(dnp, idflags));
        }

        case DT_TOK_XLATE: {
                dt_xlator_t *dxp;

                assert(lp->dn_kind == DT_NODE_TYPE);
                rp = dnp->dn_right = dt_node_cook(rp, DT_IDFLG_REF);
                dxp = dt_xlator_lookup(dtp, rp, lp, DT_XLATE_FUZZY);

                if (dxp == NULL) {
                        xyerror(D_XLATE_NONE,
                            "cannot translate from \"%s\" to \"%s\"\n",
                            dt_node_type_name(rp, n1, sizeof (n1)),
                            dt_node_type_name(lp, n2, sizeof (n2)));
                }

                dnp->dn_ident = dt_xlator_ident(dxp, lp->dn_ctfp, lp->dn_type);
                dt_node_type_assign(dnp, DT_DYN_CTFP(dtp), DT_DYN_TYPE(dtp),
                    B_FALSE);
                dt_node_attr_assign(dnp,
                    dt_attr_min(rp->dn_attr, dnp->dn_ident->di_attr));
                break;
        }

        case DT_TOK_LPAR: {
                ctf_id_t ltype, rtype;
                uint_t lkind, rkind;

                assert(lp->dn_kind == DT_NODE_TYPE);
                rp = dnp->dn_right = dt_node_cook(rp, DT_IDFLG_REF);

                ltype = ctf_type_resolve(lp->dn_ctfp, lp->dn_type);
                lkind = ctf_type_kind(lp->dn_ctfp, ltype);

                rtype = ctf_type_resolve(rp->dn_ctfp, rp->dn_type);
                rkind = ctf_type_kind(rp->dn_ctfp, rtype);

                /*
                 * The rules for casting are loosely explained in K&R[A7.5]
                 * and K&R[A6].  Basically, we can cast to the same type or
                 * same base type, between any kind of scalar values, from
                 * arrays to pointers, and we can cast anything to void.
                 * To these rules D adds casts from scalars to strings.
                 */
                if (ctf_type_compat(lp->dn_ctfp, lp->dn_type,
                    rp->dn_ctfp, rp->dn_type))
                        /*EMPTY*/;
                else if (dt_node_is_scalar(lp) &&
                    (dt_node_is_scalar(rp) || rkind == CTF_K_FUNCTION))
                        /*EMPTY*/;
                else if (dt_node_is_void(lp))
                        /*EMPTY*/;
                else if (lkind == CTF_K_POINTER && dt_node_is_pointer(rp))
                        /*EMPTY*/;
                else if (dt_node_is_string(lp) && (dt_node_is_scalar(rp) ||
                    dt_node_is_pointer(rp) || dt_node_is_strcompat(rp)))
                        /*EMPTY*/;
                else {
                        xyerror(D_CAST_INVAL,
                            "invalid cast expression: \"%s\" to \"%s\"\n",
                            dt_node_type_name(rp, n1, sizeof (n1)),
                            dt_node_type_name(lp, n2, sizeof (n2)));
                }

                dt_node_type_propagate(lp, dnp); /* see K&R[A7.5] */
                dt_node_attr_assign(dnp, dt_attr_min(lp->dn_attr, rp->dn_attr));

                /*
                 * If it's a pointer then should be able to (attempt to)
                 * assign to it.
                 */
                if (lkind == CTF_K_POINTER)
                        dnp->dn_flags |= DT_NF_WRITABLE;

                break;
        }

        case DT_TOK_COMMA:
                lp = dnp->dn_left = dt_node_cook(lp, DT_IDFLG_REF);
                rp = dnp->dn_right = dt_node_cook(rp, DT_IDFLG_REF);

                if (dt_node_is_dynamic(lp) || dt_node_is_dynamic(rp)) {
                        xyerror(D_OP_DYN, "operator %s operands "
                            "cannot be of dynamic type\n", opstr(op));
                }

                if (dt_node_is_actfunc(lp) || dt_node_is_actfunc(rp)) {
                        xyerror(D_OP_ACT, "operator %s operands "
                            "cannot be actions\n", opstr(op));
                }

                dt_node_type_propagate(rp, dnp); /* see K&R[A7.18] */
                dt_node_attr_assign(dnp, dt_attr_min(lp->dn_attr, rp->dn_attr));
                break;

        default:
                xyerror(D_UNKNOWN, "invalid binary op %s\n", opstr(op));
        }

        /*
         * Complete the conversion of E1[E2] to *((E1)+(E2)) that we started
         * at the top of our switch() above (see K&R[A7.3.1]).  Since E2 is
         * parsed as an argument_expression_list by dt_grammar.y, we can
         * end up with a comma-separated list inside of a non-associative
         * array reference.  We check for this and report an appropriate error.
         */
        if (dnp->dn_op == DT_TOK_LBRAC && op == DT_TOK_ADD) {
                dt_node_t *pnp;

                if (rp->dn_list != NULL) {
                        xyerror(D_ARR_BADREF,
                            "cannot access %s as an associative array\n",
                            dt_node_name(lp, n1, sizeof (n1)));
                }

                dnp->dn_op = DT_TOK_ADD;
                pnp = dt_node_op1(DT_TOK_DEREF, dnp);

                /*
                 * Cook callbacks are not typically permitted to allocate nodes.
                 * When we do, we must insert them in the middle of an existing
                 * allocation list rather than having them appended to the pcb
                 * list because the sub-expression may be part of a definition.
                 */
                assert(yypcb->pcb_list == pnp);
                yypcb->pcb_list = pnp->dn_link;

                pnp->dn_link = dnp->dn_link;
                dnp->dn_link = pnp;

                return (dt_node_cook(pnp, DT_IDFLG_REF));
        }

        return (dnp);
}

/*ARGSUSED*/
static dt_node_t *
dt_cook_op3(dt_node_t *dnp, uint_t idflags)
{
        dt_node_t *lp, *rp;
        ctf_file_t *ctfp;
        ctf_id_t type;

        dnp->dn_expr = dt_node_cook(dnp->dn_expr, DT_IDFLG_REF);
        lp = dnp->dn_left = dt_node_cook(dnp->dn_left, DT_IDFLG_REF);
        rp = dnp->dn_right = dt_node_cook(dnp->dn_right, DT_IDFLG_REF);

        if (!dt_node_is_scalar(dnp->dn_expr)) {
                xyerror(D_OP_SCALAR,
                    "operator ?: expression must be of scalar type\n");
        }

        if (dt_node_is_dynamic(lp) || dt_node_is_dynamic(rp)) {
                xyerror(D_OP_DYN,
                    "operator ?: operands cannot be of dynamic type\n");
        }

        /*
         * The rules for type checking for the ternary operator are complex and
         * are described in the ANSI-C spec (see K&R[A7.16]).  We implement
         * the various tests in order from least to most expensive.
         */
        if (ctf_type_compat(lp->dn_ctfp, lp->dn_type,
            rp->dn_ctfp, rp->dn_type)) {
                ctfp = lp->dn_ctfp;
                type = lp->dn_type;
        } else if (dt_node_is_integer(lp) && dt_node_is_integer(rp)) {
                dt_type_promote(lp, rp, &ctfp, &type);
        } else if (dt_node_is_strcompat(lp) && dt_node_is_strcompat(rp) &&
            (dt_node_is_string(lp) || dt_node_is_string(rp))) {
                ctfp = DT_STR_CTFP(yypcb->pcb_hdl);
                type = DT_STR_TYPE(yypcb->pcb_hdl);
        } else if (dt_node_is_ptrcompat(lp, rp, &ctfp, &type) == 0) {
                xyerror(D_OP_INCOMPAT,
                    "operator ?: operands must have compatible types\n");
        }

        if (dt_node_is_actfunc(lp) || dt_node_is_actfunc(rp)) {
                xyerror(D_OP_ACT, "action cannot be "
                    "used in a conditional context\n");
        }

        dt_node_type_assign(dnp, ctfp, type, B_FALSE);
        dt_node_attr_assign(dnp, dt_attr_min(dnp->dn_expr->dn_attr,
            dt_attr_min(lp->dn_attr, rp->dn_attr)));

        return (dnp);
}

static dt_node_t *
dt_cook_statement(dt_node_t *dnp, uint_t idflags)
{
        dnp->dn_expr = dt_node_cook(dnp->dn_expr, idflags);
        dt_node_attr_assign(dnp, dnp->dn_expr->dn_attr);

        return (dnp);
}

/*
 * If dn_aggfun is set, this node is a collapsed aggregation assignment (see
 * the special case code for DT_TOK_ASGN in dt_cook_op2() above), in which
 * case we cook both the tuple and the function call.  If dn_aggfun is NULL,
 * this node is just a reference to the aggregation's type and attributes.
 */
/*ARGSUSED*/
static dt_node_t *
dt_cook_aggregation(dt_node_t *dnp, uint_t idflags)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;

        if (dnp->dn_aggfun != NULL) {
                dnp->dn_aggfun = dt_node_cook(dnp->dn_aggfun, DT_IDFLG_REF);
                dt_node_attr_assign(dnp, dt_ident_cook(dnp,
                    dnp->dn_ident, &dnp->dn_aggtup));
        } else {
                dt_node_type_assign(dnp, DT_DYN_CTFP(dtp), DT_DYN_TYPE(dtp),
                    B_FALSE);
                dt_node_attr_assign(dnp, dnp->dn_ident->di_attr);
        }

        return (dnp);
}

/*
 * Since D permits new variable identifiers to be instantiated in any program
 * expression, we may need to cook a clause's predicate either before or after
 * the action list depending on the program code in question.  Consider:
 *
 * probe-description-list       probe-description-list
 * /x++/                        /x == 0/
 * {                            {
 *     trace(x);                    trace(x++);
 * }                            }
 *
 * In the left-hand example, the predicate uses operator ++ to instantiate 'x'
 * as a variable of type int64_t.  The predicate must be cooked first because
 * otherwise the statement trace(x) refers to an unknown identifier.  In the
 * right-hand example, the action list uses ++ to instantiate 'x'; the action
 * list must be cooked first because otherwise the predicate x == 0 refers to
 * an unknown identifier.  In order to simplify programming, we support both.
 *
 * When cooking a clause, we cook the action statements before the predicate by
 * default, since it seems more common to create or modify identifiers in the
 * action list.  If cooking fails due to an unknown identifier, we attempt to
 * cook the predicate (i.e. do it first) and then go back and cook the actions.
 * If this, too, fails (or if we get an error other than D_IDENT_UNDEF) we give
 * up and report failure back to the user.  There are five possible paths:
 *
 * cook actions = OK, cook predicate = OK -> OK
 * cook actions = OK, cook predicate = ERR -> ERR
 * cook actions = ERR, cook predicate = ERR -> ERR
 * cook actions = ERR, cook predicate = OK, cook actions = OK -> OK
 * cook actions = ERR, cook predicate = OK, cook actions = ERR -> ERR
 *
 * The programmer can still defeat our scheme by creating circular definition
 * dependencies between predicates and actions, as in this example clause:
 *
 * probe-description-list
 * /x++ && y == 0/
 * {
 *      trace(x + y++);
 * }
 *
 * but it doesn't seem worth the complexity to handle such rare cases.  The
 * user can simply use the D variable declaration syntax to work around them.
 */
static dt_node_t *
dt_cook_clause(dt_node_t *dnp, uint_t idflags)
{
        volatile int err, tries;
        jmp_buf ojb;

        /*
         * Before assigning dn_ctxattr, temporarily assign the probe attribute
         * to 'dnp' itself to force an attribute check and minimum violation.
         */
        dt_node_attr_assign(dnp, yypcb->pcb_pinfo.dtp_attr);
        dnp->dn_ctxattr = yypcb->pcb_pinfo.dtp_attr;

        bcopy(yypcb->pcb_jmpbuf, ojb, sizeof (jmp_buf));
        tries = 0;

        if (dnp->dn_pred != NULL && (err = setjmp(yypcb->pcb_jmpbuf)) != 0) {
                bcopy(ojb, yypcb->pcb_jmpbuf, sizeof (jmp_buf));
                if (tries++ != 0 || err != EDT_COMPILER || (
                    yypcb->pcb_hdl->dt_errtag != dt_errtag(D_IDENT_UNDEF) &&
                    yypcb->pcb_hdl->dt_errtag != dt_errtag(D_VAR_UNDEF)))
                        longjmp(yypcb->pcb_jmpbuf, err);
        }

        if (tries == 0) {
                yylabel("action list");

                dt_node_attr_assign(dnp,
                    dt_node_list_cook(&dnp->dn_acts, idflags));

                bcopy(ojb, yypcb->pcb_jmpbuf, sizeof (jmp_buf));
                yylabel(NULL);
        }

        if (dnp->dn_pred != NULL) {
                yylabel("predicate");

                dnp->dn_pred = dt_node_cook(dnp->dn_pred, idflags);
                dt_node_attr_assign(dnp,
                    dt_attr_min(dnp->dn_attr, dnp->dn_pred->dn_attr));

                if (!dt_node_is_scalar(dnp->dn_pred)) {
                        xyerror(D_PRED_SCALAR,
                            "predicate result must be of scalar type\n");
                }

                yylabel(NULL);
        }

        if (tries != 0) {
                yylabel("action list");

                dt_node_attr_assign(dnp,
                    dt_node_list_cook(&dnp->dn_acts, idflags));

                yylabel(NULL);
        }

        return (dnp);
}

/*ARGSUSED*/
static dt_node_t *
dt_cook_inline(dt_node_t *dnp, uint_t idflags)
{
        dt_idnode_t *inp = dnp->dn_ident->di_iarg;
        dt_ident_t *rdp;

        char n1[DT_TYPE_NAMELEN];
        char n2[DT_TYPE_NAMELEN];

        assert(dnp->dn_ident->di_flags & DT_IDFLG_INLINE);
        assert(inp->din_root->dn_flags & DT_NF_COOKED);

        /*
         * If we are inlining a translation, verify that the inline declaration
         * type exactly matches the type that is returned by the translation.
         * Otherwise just use dt_node_is_argcompat() to check the types.
         */
        if ((rdp = dt_node_resolve(inp->din_root, DT_IDENT_XLSOU)) != NULL ||
            (rdp = dt_node_resolve(inp->din_root, DT_IDENT_XLPTR)) != NULL) {

                ctf_file_t *lctfp = dnp->dn_ctfp;
                ctf_id_t ltype = ctf_type_resolve(lctfp, dnp->dn_type);

                dt_xlator_t *dxp = rdp->di_data;
                ctf_file_t *rctfp = dxp->dx_dst_ctfp;
                ctf_id_t rtype = dxp->dx_dst_base;

                if (ctf_type_kind(lctfp, ltype) == CTF_K_POINTER) {
                        ltype = ctf_type_reference(lctfp, ltype);
                        ltype = ctf_type_resolve(lctfp, ltype);
                }

                if (ctf_type_compat(lctfp, ltype, rctfp, rtype) == 0) {
                        dnerror(dnp, D_OP_INCOMPAT,
                            "inline %s definition uses incompatible types: "
                            "\"%s\" = \"%s\"\n", dnp->dn_ident->di_name,
                            dt_type_name(lctfp, ltype, n1, sizeof (n1)),
                            dt_type_name(rctfp, rtype, n2, sizeof (n2)));
                }

        } else if (dt_node_is_argcompat(dnp, inp->din_root) == 0) {
                dnerror(dnp, D_OP_INCOMPAT,
                    "inline %s definition uses incompatible types: "
                    "\"%s\" = \"%s\"\n", dnp->dn_ident->di_name,
                    dt_node_type_name(dnp, n1, sizeof (n1)),
                    dt_node_type_name(inp->din_root, n2, sizeof (n2)));
        }

        return (dnp);
}

static dt_node_t *
dt_cook_member(dt_node_t *dnp, uint_t idflags)
{
        dnp->dn_membexpr = dt_node_cook(dnp->dn_membexpr, idflags);
        dt_node_attr_assign(dnp, dnp->dn_membexpr->dn_attr);
        return (dnp);
}

/*ARGSUSED*/
static dt_node_t *
dt_cook_xlator(dt_node_t *dnp, uint_t idflags)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        dt_xlator_t *dxp = dnp->dn_xlator;
        dt_node_t *mnp;

        char n1[DT_TYPE_NAMELEN];
        char n2[DT_TYPE_NAMELEN];

        dtrace_attribute_t attr = _dtrace_maxattr;
        ctf_membinfo_t ctm;
        ctf_id_t type;
        ctf_file_t *ctfp;

        /*
         * Before cooking each translator member, we push a reference to the
         * hash containing translator-local identifiers on to pcb_globals to
         * temporarily interpose these identifiers in front of other globals.
         */
        dt_idstack_push(&yypcb->pcb_globals, dxp->dx_locals);

        for (mnp = dnp->dn_members; mnp != NULL; mnp = mnp->dn_list) {
                if (ctf_member_info(dxp->dx_dst_ctfp, dxp->dx_dst_type,
                    mnp->dn_membname, &ctm) == CTF_ERR) {
                        xyerror(D_XLATE_MEMB,
                            "translator member %s is not a member of %s\n",
                            mnp->dn_membname, ctf_type_name(dxp->dx_dst_ctfp,
                            dxp->dx_dst_type, n1, sizeof (n1)));
                }

                (void) dt_node_cook(mnp, DT_IDFLG_REF);
                ctfp = dxp->dx_dst_ctfp;
                type = ctm.ctm_type;

                /*
                 *
                 * This probably doesn't need to be resolved, because it's of
                 * the translator, but is done for completeness right now.
                 */
                dt_resolve_forward_decl(&ctfp, &type);
                dt_node_type_assign(mnp, ctfp, type,
                    B_FALSE);
                attr = dt_attr_min(attr, mnp->dn_attr);

                if (dt_node_is_argcompat(mnp, mnp->dn_membexpr) == 0) {
                        xyerror(D_XLATE_INCOMPAT,
                            "translator member %s definition uses "
                            "incompatible types: \"%s\" = \"%s\"\n",
                            mnp->dn_membname,
                            dt_node_type_name(mnp, n1, sizeof (n1)),
                            dt_node_type_name(mnp->dn_membexpr,
                            n2, sizeof (n2)));
                }
        }

        dt_idstack_pop(&yypcb->pcb_globals, dxp->dx_locals);

        dxp->dx_souid.di_attr = attr;
        dxp->dx_ptrid.di_attr = attr;

        dt_node_type_assign(dnp, DT_DYN_CTFP(dtp), DT_DYN_TYPE(dtp), B_FALSE);
        dt_node_attr_assign(dnp, _dtrace_defattr);

        return (dnp);
}

static void
dt_node_provider_cmp_argv(dt_provider_t *pvp, dt_node_t *pnp, const char *kind,
    uint_t old_argc, dt_node_t *old_argv, uint_t new_argc, dt_node_t *new_argv)
{
        dt_probe_t *prp = pnp->dn_ident->di_data;
        uint_t i;

        char n1[DT_TYPE_NAMELEN];
        char n2[DT_TYPE_NAMELEN];

        if (old_argc != new_argc) {
                dnerror(pnp, D_PROV_INCOMPAT,
                    "probe %s:%s %s prototype mismatch:\n"
                    "\t current: %u arg%s\n\tprevious: %u arg%s\n",
                    pvp->pv_desc.dtvd_name, prp->pr_ident->di_name, kind,
                    new_argc, new_argc != 1 ? "s" : "",
                    old_argc, old_argc != 1 ? "s" : "");
        }

        for (i = 0; i < old_argc; i++,
            old_argv = old_argv->dn_list, new_argv = new_argv->dn_list) {
                if (ctf_type_cmp(old_argv->dn_ctfp, old_argv->dn_type,
                    new_argv->dn_ctfp, new_argv->dn_type) == 0)
                        continue;

                dnerror(pnp, D_PROV_INCOMPAT,
                    "probe %s:%s %s prototype argument #%u mismatch:\n"
                    "\t current: %s\n\tprevious: %s\n",
                    pvp->pv_desc.dtvd_name, prp->pr_ident->di_name, kind, i + 1,
                    dt_node_type_name(new_argv, n1, sizeof (n1)),
                    dt_node_type_name(old_argv, n2, sizeof (n2)));
        }
}

/*
 * Compare a new probe declaration with an existing probe definition (either
 * from a previous declaration or cached from the kernel).  If the existing
 * definition and declaration both have an input and output parameter list,
 * compare both lists.  Otherwise compare only the output parameter lists.
 */
static void
dt_node_provider_cmp(dt_provider_t *pvp, dt_node_t *pnp,
    dt_probe_t *old, dt_probe_t *new)
{
        dt_node_provider_cmp_argv(pvp, pnp, "output",
            old->pr_xargc, old->pr_xargs, new->pr_xargc, new->pr_xargs);

        if (old->pr_nargs != old->pr_xargs && new->pr_nargs != new->pr_xargs) {
                dt_node_provider_cmp_argv(pvp, pnp, "input",
                    old->pr_nargc, old->pr_nargs, new->pr_nargc, new->pr_nargs);
        }

        if (old->pr_nargs == old->pr_xargs && new->pr_nargs != new->pr_xargs) {
                if (pvp->pv_flags & DT_PROVIDER_IMPL) {
                        dnerror(pnp, D_PROV_INCOMPAT,
                            "provider interface mismatch: %s\n"
                            "\t current: probe %s:%s has an output prototype\n"
                            "\tprevious: probe %s:%s has no output prototype\n",
                            pvp->pv_desc.dtvd_name, pvp->pv_desc.dtvd_name,
                            new->pr_ident->di_name, pvp->pv_desc.dtvd_name,
                            old->pr_ident->di_name);
                }

                if (old->pr_ident->di_gen == yypcb->pcb_hdl->dt_gen)
                        old->pr_ident->di_flags |= DT_IDFLG_ORPHAN;

                dt_idhash_delete(pvp->pv_probes, old->pr_ident);
                dt_probe_declare(pvp, new);
        }
}

static void
dt_cook_probe(dt_node_t *dnp, dt_provider_t *pvp)
{
        dtrace_hdl_t *dtp = yypcb->pcb_hdl;
        dt_probe_t *prp = dnp->dn_ident->di_data;

        dt_xlator_t *dxp;
        uint_t i;

        char n1[DT_TYPE_NAMELEN];
        char n2[DT_TYPE_NAMELEN];

        if (prp->pr_nargs == prp->pr_xargs)
                return;

        for (i = 0; i < prp->pr_xargc; i++) {
                dt_node_t *xnp = prp->pr_xargv[i];
                dt_node_t *nnp = prp->pr_nargv[prp->pr_mapping[i]];

                if ((dxp = dt_xlator_lookup(dtp,
                    nnp, xnp, DT_XLATE_FUZZY)) != NULL) {
                        if (dt_provider_xref(dtp, pvp, dxp->dx_id) != 0)
                                longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
                        continue;
                }

                if (dt_node_is_argcompat(nnp, xnp))
                        continue; /* no translator defined and none required */

                dnerror(dnp, D_PROV_PRXLATOR, "translator for %s:%s output "
                    "argument #%u from %s to %s is not defined\n",
                    pvp->pv_desc.dtvd_name, dnp->dn_ident->di_name, i + 1,
                    dt_node_type_name(nnp, n1, sizeof (n1)),
                    dt_node_type_name(xnp, n2, sizeof (n2)));
        }
}

/*ARGSUSED*/
static dt_node_t *
dt_cook_provider(dt_node_t *dnp, uint_t idflags)
{
        dt_provider_t *pvp = dnp->dn_provider;
        dt_node_t *pnp;

        /*
         * If we're declaring a provider for the first time and it is unknown
         * to dtrace(7D), insert the probe definitions into the provider's hash.
         * If we're redeclaring a known provider, verify the interface matches.
         */
        for (pnp = dnp->dn_probes; pnp != NULL; pnp = pnp->dn_list) {
                const char *probename = pnp->dn_ident->di_name;
                dt_probe_t *prp = dt_probe_lookup(pvp, probename);

                assert(pnp->dn_kind == DT_NODE_PROBE);

                if (prp != NULL && dnp->dn_provred) {
                        dt_node_provider_cmp(pvp, pnp,
                            prp, pnp->dn_ident->di_data);
                } else if (prp == NULL && dnp->dn_provred) {
                        dnerror(pnp, D_PROV_INCOMPAT,
                            "provider interface mismatch: %s\n"
                            "\t current: probe %s:%s defined\n"
                            "\tprevious: probe %s:%s not defined\n",
                            dnp->dn_provname, dnp->dn_provname,
                            probename, dnp->dn_provname, probename);
                } else if (prp != NULL) {
                        dnerror(pnp, D_PROV_PRDUP, "probe redeclared: %s:%s\n",
                            dnp->dn_provname, probename);
                } else
                        dt_probe_declare(pvp, pnp->dn_ident->di_data);

                dt_cook_probe(pnp, pvp);
        }

        return (dnp);
}

/*ARGSUSED*/
static dt_node_t *
dt_cook_none(dt_node_t *dnp, uint_t idflags)
{
        return (dnp);
}

static dt_node_t *(*dt_cook_funcs[])(dt_node_t *, uint_t) = {
        dt_cook_none,           /* DT_NODE_FREE */
        dt_cook_none,           /* DT_NODE_INT */
        dt_cook_none,           /* DT_NODE_STRING */
        dt_cook_ident,          /* DT_NODE_IDENT */
        dt_cook_var,            /* DT_NODE_VAR */
        dt_cook_none,           /* DT_NODE_SYM */
        dt_cook_none,           /* DT_NODE_TYPE */
        dt_cook_func,           /* DT_NODE_FUNC */
        dt_cook_op1,            /* DT_NODE_OP1 */
        dt_cook_op2,            /* DT_NODE_OP2 */
        dt_cook_op3,            /* DT_NODE_OP3 */
        dt_cook_statement,      /* DT_NODE_DEXPR */
        dt_cook_statement,      /* DT_NODE_DFUNC */
        dt_cook_aggregation,    /* DT_NODE_AGG */
        dt_cook_none,           /* DT_NODE_PDESC */
        dt_cook_clause,         /* DT_NODE_CLAUSE */
        dt_cook_inline,         /* DT_NODE_INLINE */
        dt_cook_member,         /* DT_NODE_MEMBER */
        dt_cook_xlator,         /* DT_NODE_XLATOR */
        dt_cook_none,           /* DT_NODE_PROBE */
        dt_cook_provider,       /* DT_NODE_PROVIDER */
        dt_cook_none,           /* DT_NODE_PROG */
        dt_cook_none,           /* DT_NODE_IF */
};

/*
 * Recursively cook the parse tree starting at the specified node.  The idflags
 * parameter is used to indicate the type of reference (r/w) and is applied to
 * the resulting identifier if it is a D variable or D aggregation.
 */
dt_node_t *
dt_node_cook(dt_node_t *dnp, uint_t idflags)
{
        int oldlineno = yylineno;

        yylineno = dnp->dn_line;

        assert(dnp->dn_kind <
            sizeof (dt_cook_funcs) / sizeof (dt_cook_funcs[0]));
        dnp = dt_cook_funcs[dnp->dn_kind](dnp, idflags);
        dnp->dn_flags |= DT_NF_COOKED;

        if (dnp->dn_kind == DT_NODE_VAR || dnp->dn_kind == DT_NODE_AGG)
                dnp->dn_ident->di_flags |= idflags;

        yylineno = oldlineno;
        return (dnp);
}

dtrace_attribute_t
dt_node_list_cook(dt_node_t **pnp, uint_t idflags)
{
        dtrace_attribute_t attr = _dtrace_defattr;
        dt_node_t *dnp, *nnp;

        for (dnp = (pnp != NULL ? *pnp : NULL); dnp != NULL; dnp = nnp) {
                nnp = dnp->dn_list;
                dnp = *pnp = dt_node_cook(dnp, idflags);
                attr = dt_attr_min(attr, dnp->dn_attr);
                dnp->dn_list = nnp;
                pnp = &dnp->dn_list;
        }

        return (attr);
}

void
dt_node_list_free(dt_node_t **pnp)
{
        dt_node_t *dnp, *nnp;

        for (dnp = (pnp != NULL ? *pnp : NULL); dnp != NULL; dnp = nnp) {
                nnp = dnp->dn_list;
                dt_node_free(dnp);
        }

        if (pnp != NULL)
                *pnp = NULL;
}

void
dt_node_link_free(dt_node_t **pnp)
{
        dt_node_t *dnp, *nnp;

        for (dnp = (pnp != NULL ? *pnp : NULL); dnp != NULL; dnp = nnp) {
                nnp = dnp->dn_link;
                dt_node_free(dnp);
        }

        for (dnp = (pnp != NULL ? *pnp : NULL); dnp != NULL; dnp = nnp) {
                nnp = dnp->dn_link;
                free(dnp);
        }

        if (pnp != NULL)
                *pnp = NULL;
}

dt_node_t *
dt_node_link(dt_node_t *lp, dt_node_t *rp)
{
        dt_node_t *dnp;

        if (lp == NULL)
                return (rp);
        else if (rp == NULL)
                return (lp);

        for (dnp = lp; dnp->dn_list != NULL; dnp = dnp->dn_list)
                continue;

        dnp->dn_list = rp;
        return (lp);
}

/*
 * Compute the DOF dtrace_diftype_t representation of a node's type.  This is
 * called from a variety of places in the library so it cannot assume yypcb
 * is valid: any references to handle-specific data must be made through 'dtp'.
 */
void
dt_node_diftype(dtrace_hdl_t *dtp, const dt_node_t *dnp, dtrace_diftype_t *tp)
{
        if (dnp->dn_ctfp == DT_STR_CTFP(dtp) &&
            dnp->dn_type == DT_STR_TYPE(dtp)) {
                tp->dtdt_kind = DIF_TYPE_STRING;
                tp->dtdt_ckind = CTF_K_UNKNOWN;
        } else {
                tp->dtdt_kind = DIF_TYPE_CTF;
                tp->dtdt_ckind = ctf_type_kind(dnp->dn_ctfp,
                    ctf_type_resolve(dnp->dn_ctfp, dnp->dn_type));
        }

        tp->dtdt_flags = (dnp->dn_flags & DT_NF_REF) ?
            (dnp->dn_flags & DT_NF_USERLAND) ? DIF_TF_BYUREF :
            DIF_TF_BYREF : 0;
        tp->dtdt_pad = 0;
        tp->dtdt_size = ctf_type_size(dnp->dn_ctfp, dnp->dn_type);
}

/*
 * Output the parse tree as D.  The "-xtree=8" argument will call this
 * function to print out the program after any syntactic sugar
 * transformations have been applied (e.g. to implement "if").  The
 * resulting output can be used to understand the transformations
 * applied by these features, or to run such a script on a system that
 * does not support these features
 *
 * Note that the output does not express precisely the same program as
 * the input.  In particular:
 *  - Only the clauses are output.  #pragma options, variable
 *    declarations, etc. are excluded.
 *  - Command argument substitution has already been done, so the output
 *    will not contain e.g. $$1, but rather the substituted string.
 */
void
dt_printd(dt_node_t *dnp, FILE *fp, int depth)
{
        dt_node_t *arg;

        switch (dnp->dn_kind) {
        case DT_NODE_INT:
                (void) fprintf(fp, "0x%llx", (u_longlong_t)dnp->dn_value);
                if (!(dnp->dn_flags & DT_NF_SIGNED))
                        (void) fprintf(fp, "u");
                break;

        case DT_NODE_STRING: {
                char *escd = strchr2esc(dnp->dn_string, strlen(dnp->dn_string));
                (void) fprintf(fp, "\"%s\"", escd);
                free(escd);
                break;
        }

        case DT_NODE_IDENT:
                (void) fprintf(fp, "%s", dnp->dn_string);
                break;

        case DT_NODE_VAR:
                (void) fprintf(fp, "%s%s",
                    (dnp->dn_ident->di_flags & DT_IDFLG_LOCAL) ? "this->" :
                    (dnp->dn_ident->di_flags & DT_IDFLG_TLS) ? "self->" : "",
                    dnp->dn_ident->di_name);

                if (dnp->dn_args != NULL) {
                        (void) fprintf(fp, "[");

                        for (arg = dnp->dn_args; arg != NULL;
                            arg = arg->dn_list) {
                                dt_printd(arg, fp, 0);
                                if (arg->dn_list != NULL)
                                        (void) fprintf(fp, ", ");
                        }

                        (void) fprintf(fp, "]");
                }
                break;

        case DT_NODE_SYM: {
                const dtrace_syminfo_t *dts = dnp->dn_ident->di_data;
                (void) fprintf(fp, "%s`%s", dts->dts_object, dts->dts_name);
                break;
        }
        case DT_NODE_FUNC:
                (void) fprintf(fp, "%s(", dnp->dn_ident->di_name);

                for (arg = dnp->dn_args; arg != NULL; arg = arg->dn_list) {
                        dt_printd(arg, fp, 0);
                        if (arg->dn_list != NULL)
                                (void) fprintf(fp, ", ");
                }
                (void) fprintf(fp, ")");
                break;

        case DT_NODE_OP1:
                (void) fprintf(fp, "%s(", opstr(dnp->dn_op));
                dt_printd(dnp->dn_child, fp, 0);
                (void) fprintf(fp, ")");
                break;

        case DT_NODE_OP2:
                (void) fprintf(fp, "(");
                dt_printd(dnp->dn_left, fp, 0);
                if (dnp->dn_op == DT_TOK_LPAR) {
                        (void) fprintf(fp, ")");
                        dt_printd(dnp->dn_right, fp, 0);
                        break;
                }
                if (dnp->dn_op == DT_TOK_PTR || dnp->dn_op == DT_TOK_DOT ||
                    dnp->dn_op == DT_TOK_LBRAC)
                        (void) fprintf(fp, "%s", opstr(dnp->dn_op));
                else
                        (void) fprintf(fp, " %s ", opstr(dnp->dn_op));
                dt_printd(dnp->dn_right, fp, 0);
                if (dnp->dn_op == DT_TOK_LBRAC) {
                        dt_node_t *ln = dnp->dn_right;
                        while (ln->dn_list != NULL) {
                                (void) fprintf(fp, ", ");
                                dt_printd(ln->dn_list, fp, depth);
                                ln = ln->dn_list;
                        }
                        (void) fprintf(fp, "]");
                }
                (void) fprintf(fp, ")");
                break;

        case DT_NODE_OP3:
                (void) fprintf(fp, "(");
                dt_printd(dnp->dn_expr, fp, 0);
                (void) fprintf(fp, " ? ");
                dt_printd(dnp->dn_left, fp, 0);
                (void) fprintf(fp, " : ");
                dt_printd(dnp->dn_right, fp, 0);
                (void) fprintf(fp, ")");
                break;

        case DT_NODE_DEXPR:
        case DT_NODE_DFUNC:
                (void) fprintf(fp, "%*s", depth * 8, "");
                dt_printd(dnp->dn_expr, fp, depth + 1);
                (void) fprintf(fp, ";\n");
                break;

        case DT_NODE_PDESC:
                (void) fprintf(fp, "%s:%s:%s:%s",
                    dnp->dn_desc->dtpd_provider, dnp->dn_desc->dtpd_mod,
                    dnp->dn_desc->dtpd_func, dnp->dn_desc->dtpd_name);
                break;

        case DT_NODE_CLAUSE:
                for (arg = dnp->dn_pdescs; arg != NULL; arg = arg->dn_list) {
                        dt_printd(arg, fp, 0);
                        if (arg->dn_list != NULL)
                                (void) fprintf(fp, ",");
                        (void) fprintf(fp, "\n");
                }

                if (dnp->dn_pred != NULL) {
                        (void) fprintf(fp, "/");
                        dt_printd(dnp->dn_pred, fp, 0);
                        (void) fprintf(fp, "/\n");
                }
                        (void) fprintf(fp, "{\n");

                for (arg = dnp->dn_acts; arg != NULL; arg = arg->dn_list)
                        dt_printd(arg, fp, depth + 1);
                (void) fprintf(fp, "}\n");
                (void) fprintf(fp, "\n");
                break;

        case DT_NODE_IF:
                (void) fprintf(fp, "%*sif (", depth * 8, "");
                dt_printd(dnp->dn_conditional, fp, 0);
                (void) fprintf(fp, ") {\n");

                for (arg = dnp->dn_body; arg != NULL; arg = arg->dn_list)
                        dt_printd(arg, fp, depth + 1);
                if (dnp->dn_alternate_body == NULL) {
                        (void) fprintf(fp, "%*s}\n", depth * 8, "");
                } else {
                        (void) fprintf(fp, "%*s} else {\n", depth * 8, "");
                        for (arg = dnp->dn_alternate_body; arg != NULL;
                            arg = arg->dn_list)
                                dt_printd(arg, fp, depth + 1);
                        (void) fprintf(fp, "%*s}\n", depth * 8, "");
                }

                break;

        default:
                (void) fprintf(fp, "/* bad node %p, kind %d */\n",
                    (void *)dnp, dnp->dn_kind);
        }
}

void
dt_node_printr(dt_node_t *dnp, FILE *fp, int depth)
{
        char n[DT_TYPE_NAMELEN], buf[BUFSIZ], a[8];
        const dtrace_syminfo_t *dts;
        const dt_idnode_t *inp;
        dt_node_t *arg;

        (void) fprintf(fp, "%*s", depth * 2, "");
        (void) dt_attr_str(dnp->dn_attr, a, sizeof (a));

        if (dnp->dn_ctfp != NULL && dnp->dn_type != CTF_ERR &&
            ctf_type_name(dnp->dn_ctfp, dnp->dn_type, n, sizeof (n)) != NULL) {
                (void) snprintf(buf, BUFSIZ, "type=<%s> attr=%s flags=", n, a);
        } else {
                (void) snprintf(buf, BUFSIZ, "type=<%ld> attr=%s flags=",
                    dnp->dn_type, a);
        }

        if (dnp->dn_flags != 0) {
                n[0] = '\0';
                if (dnp->dn_flags & DT_NF_SIGNED)
                        (void) strcat(n, ",SIGN");
                if (dnp->dn_flags & DT_NF_COOKED)
                        (void) strcat(n, ",COOK");
                if (dnp->dn_flags & DT_NF_REF)
                        (void) strcat(n, ",REF");
                if (dnp->dn_flags & DT_NF_LVALUE)
                        (void) strcat(n, ",LVAL");
                if (dnp->dn_flags & DT_NF_WRITABLE)
                        (void) strcat(n, ",WRITE");
                if (dnp->dn_flags & DT_NF_BITFIELD)
                        (void) strcat(n, ",BITF");
                if (dnp->dn_flags & DT_NF_USERLAND)
                        (void) strcat(n, ",USER");
                (void) strcat(buf, n + 1);
        } else
                (void) strcat(buf, "0");

        switch (dnp->dn_kind) {
        case DT_NODE_FREE:
                (void) fprintf(fp, "FREE <node %p>\n", (void *)dnp);
                break;

        case DT_NODE_INT:
                (void) fprintf(fp, "INT 0x%llx (%s)\n",
                    (u_longlong_t)dnp->dn_value, buf);
                break;

        case DT_NODE_STRING:
                (void) fprintf(fp, "STRING \"%s\" (%s)\n", dnp->dn_string, buf);
                break;

        case DT_NODE_IDENT:
                (void) fprintf(fp, "IDENT %s (%s)\n", dnp->dn_string, buf);
                break;

        case DT_NODE_VAR:
                (void) fprintf(fp, "VARIABLE %s%s (%s)\n",
                    (dnp->dn_ident->di_flags & DT_IDFLG_LOCAL) ? "this->" :
                    (dnp->dn_ident->di_flags & DT_IDFLG_TLS) ? "self->" : "",
                    dnp->dn_ident->di_name, buf);

                if (dnp->dn_args != NULL)
                        (void) fprintf(fp, "%*s[\n", depth * 2, "");

                for (arg = dnp->dn_args; arg != NULL; arg = arg->dn_list) {
                        dt_node_printr(arg, fp, depth + 1);
                        if (arg->dn_list != NULL)
                                (void) fprintf(fp, "%*s,\n", depth * 2, "");
                }

                if (dnp->dn_args != NULL)
                        (void) fprintf(fp, "%*s]\n", depth * 2, "");
                break;

        case DT_NODE_SYM:
                dts = dnp->dn_ident->di_data;
                (void) fprintf(fp, "SYMBOL %s`%s (%s)\n",
                    dts->dts_object, dts->dts_name, buf);
                break;

        case DT_NODE_TYPE:
                if (dnp->dn_string != NULL) {
                        (void) fprintf(fp, "TYPE (%s) %s\n",
                            buf, dnp->dn_string);
                } else
                        (void) fprintf(fp, "TYPE (%s)\n", buf);
                break;

        case DT_NODE_FUNC:
                (void) fprintf(fp, "FUNC %s (%s)\n",
                    dnp->dn_ident->di_name, buf);

                for (arg = dnp->dn_args; arg != NULL; arg = arg->dn_list) {
                        dt_node_printr(arg, fp, depth + 1);
                        if (arg->dn_list != NULL)
                                (void) fprintf(fp, "%*s,\n", depth * 2, "");
                }
                break;

        case DT_NODE_OP1:
                (void) fprintf(fp, "OP1 %s (%s)\n", opstr(dnp->dn_op), buf);
                dt_node_printr(dnp->dn_child, fp, depth + 1);
                break;

        case DT_NODE_OP2:
                (void) fprintf(fp, "OP2 %s (%s)\n", opstr(dnp->dn_op), buf);
                dt_node_printr(dnp->dn_left, fp, depth + 1);
                dt_node_printr(dnp->dn_right, fp, depth + 1);
                if (dnp->dn_op == DT_TOK_LBRAC) {
                        dt_node_t *ln = dnp->dn_right;
                        while (ln->dn_list != NULL) {
                                dt_node_printr(ln->dn_list, fp, depth + 1);
                                ln = ln->dn_list;
                        }
                }
                break;

        case DT_NODE_OP3:
                (void) fprintf(fp, "OP3 (%s)\n", buf);
                dt_node_printr(dnp->dn_expr, fp, depth + 1);
                (void) fprintf(fp, "%*s?\n", depth * 2, "");
                dt_node_printr(dnp->dn_left, fp, depth + 1);
                (void) fprintf(fp, "%*s:\n", depth * 2, "");
                dt_node_printr(dnp->dn_right, fp, depth + 1);
                break;

        case DT_NODE_DEXPR:
        case DT_NODE_DFUNC:
                (void) fprintf(fp, "D EXPRESSION attr=%s\n", a);
                dt_node_printr(dnp->dn_expr, fp, depth + 1);
                break;

        case DT_NODE_AGG:
                (void) fprintf(fp, "AGGREGATE @%s attr=%s [\n",
                    dnp->dn_ident->di_name, a);

                for (arg = dnp->dn_aggtup; arg != NULL; arg = arg->dn_list) {
                        dt_node_printr(arg, fp, depth + 1);
                        if (arg->dn_list != NULL)
                                (void) fprintf(fp, "%*s,\n", depth * 2, "");
                }

                if (dnp->dn_aggfun) {
                        (void) fprintf(fp, "%*s] = ", depth * 2, "");
                        dt_node_printr(dnp->dn_aggfun, fp, depth + 1);
                } else
                        (void) fprintf(fp, "%*s]\n", depth * 2, "");

                if (dnp->dn_aggfun)
                        (void) fprintf(fp, "%*s)\n", depth * 2, "");
                break;

        case DT_NODE_PDESC:
                (void) fprintf(fp, "PDESC %s:%s:%s:%s [%u]\n",
                    dnp->dn_desc->dtpd_provider, dnp->dn_desc->dtpd_mod,
                    dnp->dn_desc->dtpd_func, dnp->dn_desc->dtpd_name,
                    dnp->dn_desc->dtpd_id);
                break;

        case DT_NODE_CLAUSE:
                (void) fprintf(fp, "CLAUSE attr=%s\n", a);

                for (arg = dnp->dn_pdescs; arg != NULL; arg = arg->dn_list)
                        dt_node_printr(arg, fp, depth + 1);

                (void) fprintf(fp, "%*sCTXATTR %s\n", depth * 2, "",
                    dt_attr_str(dnp->dn_ctxattr, a, sizeof (a)));

                if (dnp->dn_pred != NULL) {
                        (void) fprintf(fp, "%*sPREDICATE /\n", depth * 2, "");
                        dt_node_printr(dnp->dn_pred, fp, depth + 1);
                        (void) fprintf(fp, "%*s/\n", depth * 2, "");
                }

                for (arg = dnp->dn_acts; arg != NULL; arg = arg->dn_list)
                        dt_node_printr(arg, fp, depth + 1);
                (void) fprintf(fp, "\n");
                break;

        case DT_NODE_INLINE:
                inp = dnp->dn_ident->di_iarg;

                (void) fprintf(fp, "INLINE %s (%s)\n",
                    dnp->dn_ident->di_name, buf);
                dt_node_printr(inp->din_root, fp, depth + 1);
                break;

        case DT_NODE_MEMBER:
                (void) fprintf(fp, "MEMBER %s (%s)\n", dnp->dn_membname, buf);
                if (dnp->dn_membexpr)
                        dt_node_printr(dnp->dn_membexpr, fp, depth + 1);
                break;

        case DT_NODE_XLATOR:
                (void) fprintf(fp, "XLATOR (%s)", buf);

                if (ctf_type_name(dnp->dn_xlator->dx_src_ctfp,
                    dnp->dn_xlator->dx_src_type, n, sizeof (n)) != NULL)
                        (void) fprintf(fp, " from <%s>", n);

                if (ctf_type_name(dnp->dn_xlator->dx_dst_ctfp,
                    dnp->dn_xlator->dx_dst_type, n, sizeof (n)) != NULL)
                        (void) fprintf(fp, " to <%s>", n);

                (void) fprintf(fp, "\n");

                for (arg = dnp->dn_members; arg != NULL; arg = arg->dn_list)
                        dt_node_printr(arg, fp, depth + 1);
                break;

        case DT_NODE_PROBE:
                (void) fprintf(fp, "PROBE %s\n", dnp->dn_ident->di_name);
                break;

        case DT_NODE_PROVIDER:
                (void) fprintf(fp, "PROVIDER %s (%s)\n",
                    dnp->dn_provname, dnp->dn_provred ? "redecl" : "decl");
                for (arg = dnp->dn_probes; arg != NULL; arg = arg->dn_list)
                        dt_node_printr(arg, fp, depth + 1);
                break;

        case DT_NODE_PROG:
                (void) fprintf(fp, "PROGRAM attr=%s\n", a);
                for (arg = dnp->dn_list; arg != NULL; arg = arg->dn_list)
                        dt_node_printr(arg, fp, depth + 1);
                break;

        case DT_NODE_IF:
                (void) fprintf(fp, "IF attr=%s CONDITION:\n", a);

                dt_node_printr(dnp->dn_conditional, fp, depth + 1);

                (void) fprintf(fp, "%*sIF BODY: \n", depth * 2, "");
                for (arg = dnp->dn_body; arg != NULL; arg = arg->dn_list)
                        dt_node_printr(arg, fp, depth + 1);

                if (dnp->dn_alternate_body != NULL) {
                        (void) fprintf(fp, "%*sIF ELSE: \n", depth * 2, "");
                        for (arg = dnp->dn_alternate_body; arg != NULL;
                            arg = arg->dn_list)
                                dt_node_printr(arg, fp, depth + 1);
                }

                break;

        default:
                (void) fprintf(fp, "<bad node %p, kind %d>\n",
                    (void *)dnp, dnp->dn_kind);
        }
}

int
dt_node_root(dt_node_t *dnp)
{
        yypcb->pcb_root = dnp;
        return (0);
}

/*PRINTFLIKE3*/
void
dnerror(const dt_node_t *dnp, dt_errtag_t tag, const char *format, ...)
{
        int oldlineno = yylineno;
        va_list ap;

        yylineno = dnp->dn_line;

        va_start(ap, format);
        xyvwarn(tag, format, ap);
        va_end(ap);

        yylineno = oldlineno;
        longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);
}

/*PRINTFLIKE3*/
void
dnwarn(const dt_node_t *dnp, dt_errtag_t tag, const char *format, ...)
{
        int oldlineno = yylineno;
        va_list ap;

        yylineno = dnp->dn_line;

        va_start(ap, format);
        xyvwarn(tag, format, ap);
        va_end(ap);

        yylineno = oldlineno;
}

/*PRINTFLIKE2*/
void
xyerror(dt_errtag_t tag, const char *format, ...)
{
        va_list ap;

        va_start(ap, format);
        xyvwarn(tag, format, ap);
        va_end(ap);

        longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);
}

/*PRINTFLIKE2*/
void
xywarn(dt_errtag_t tag, const char *format, ...)
{
        va_list ap;

        va_start(ap, format);
        xyvwarn(tag, format, ap);
        va_end(ap);
}

void
xyvwarn(dt_errtag_t tag, const char *format, va_list ap)
{
        if (yypcb == NULL)
                return; /* compiler is not currently active: act as a no-op */

        dt_set_errmsg(yypcb->pcb_hdl, dt_errtag(tag), yypcb->pcb_region,
            yypcb->pcb_filetag, yypcb->pcb_fileptr ? yylineno : 0, format, ap);
}

/*PRINTFLIKE1*/
void
yyerror(const char *format, ...)
{
        va_list ap;

        va_start(ap, format);
        yyvwarn(format, ap);
        va_end(ap);

        longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);
}

/*PRINTFLIKE1*/
void
yywarn(const char *format, ...)
{
        va_list ap;

        va_start(ap, format);
        yyvwarn(format, ap);
        va_end(ap);
}

void
yyvwarn(const char *format, va_list ap)
{
        if (yypcb == NULL)
                return; /* compiler is not currently active: act as a no-op */

        dt_set_errmsg(yypcb->pcb_hdl, dt_errtag(D_SYNTAX), yypcb->pcb_region,
            yypcb->pcb_filetag, yypcb->pcb_fileptr ? yylineno : 0, format, ap);

        if (strchr(format, '\n') == NULL) {
                dtrace_hdl_t *dtp = yypcb->pcb_hdl;
                size_t len = strlen(dtp->dt_errmsg);
                char *p, *s = dtp->dt_errmsg + len;
                size_t n = sizeof (dtp->dt_errmsg) - len;

                if (yytext[0] == '\0')
                        (void) snprintf(s, n, " near end of input");
                else if (yytext[0] == '\n')
                        (void) snprintf(s, n, " near end of line");
                else {
                        if ((p = strchr(yytext, '\n')) != NULL)
                                *p = '\0'; /* crop at newline */
                        (void) snprintf(s, n, " near \"%s\"", yytext);
                }
        }
}

void
yylabel(const char *label)
{
        dt_dprintf("set label to <%s>\n", label ? label : "NULL");
        yypcb->pcb_region = label;
}

int
yywrap(void)
{
        return (1); /* indicate that lex should return a zero token for EOF */
}