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import less(1)
[unleashed/tickless.git] / usr / src / lib / libdtrace / common / dt_cg.c
blobfa88636644c2a1c7f3becf2330479c919ba70f6b
1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23 /*
24 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
25 * Use is subject to license terms.
26 */
27
28 /*
29 * Copyright (c) 2012 by Delphix. All rights reserved.
30 */
31
32 #include <sys/types.h>
33 #include <sys/sysmacros.h>
34 #include <sys/isa_defs.h>
35
36 #include <strings.h>
37 #include <stdlib.h>
38 #include <setjmp.h>
39 #include <assert.h>
40 #include <errno.h>
41
42 #include <dt_impl.h>
43 #include <dt_grammar.h>
44 #include <dt_module.h>
45 #include <dt_parser.h>
46 #include <dt_provider.h>
47
48 static void dt_cg_node(dt_node_t *, dt_irlist_t *, dt_regset_t *);
49
50 static dt_irnode_t *
51 dt_cg_node_alloc(uint_t label, dif_instr_t instr)
52 {
53 dt_irnode_t *dip = malloc(sizeof (dt_irnode_t));
54
55 if (dip == NULL)
56 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
57
58 dip->di_label = label;
59 dip->di_instr = instr;
60 dip->di_extern = NULL;
61 dip->di_next = NULL;
62
63 return (dip);
64 }
65
66 /*
67 * Code generator wrapper function for ctf_member_info. If we are given a
68 * reference to a forward declaration tag, search the entire type space for
69 * the actual definition and then call ctf_member_info on the result.
70 */
71 static ctf_file_t *
72 dt_cg_membinfo(ctf_file_t *fp, ctf_id_t type, const char *s, ctf_membinfo_t *mp)
73 {
74 dt_resolve_forward_decl(&fp, &type);
75
76 if (ctf_member_info(fp, type, s, mp) == CTF_ERR)
77 return (NULL); /* ctf_errno is set for us */
78
79 return (fp);
80 }
81
82 static void
83 dt_cg_xsetx(dt_irlist_t *dlp, dt_ident_t *idp, uint_t lbl, int reg, uint64_t x)
84 {
85 int flag = idp != NULL ? DT_INT_PRIVATE : DT_INT_SHARED;
86 int intoff = dt_inttab_insert(yypcb->pcb_inttab, x, flag);
87 dif_instr_t instr = DIF_INSTR_SETX((uint_t)intoff, reg);
88
89 if (intoff == -1)
90 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
91
92 if (intoff > DIF_INTOFF_MAX)
93 longjmp(yypcb->pcb_jmpbuf, EDT_INT2BIG);
94
95 dt_irlist_append(dlp, dt_cg_node_alloc(lbl, instr));
96
97 if (idp != NULL)
98 dlp->dl_last->di_extern = idp;
99 }
100
101 static void
102 dt_cg_setx(dt_irlist_t *dlp, int reg, uint64_t x)
103 {
104 dt_cg_xsetx(dlp, NULL, DT_LBL_NONE, reg, x);
105 }
106
107 /*
108 * When loading bit-fields, we want to convert a byte count in the range
109 * 1-8 to the closest power of 2 (e.g. 3->4, 5->8, etc). The clp2() function
110 * is a clever implementation from "Hacker's Delight" by Henry Warren, Jr.
111 */
112 static size_t
113 clp2(size_t x)
114 {
115 x--;
116
117 x |= (x >> 1);
118 x |= (x >> 2);
119 x |= (x >> 4);
120 x |= (x >> 8);
121 x |= (x >> 16);
122
123 return (x + 1);
124 }
125
126 /*
127 * Lookup the correct load opcode to use for the specified node and CTF type.
128 * We determine the size and convert it to a 3-bit index. Our lookup table
129 * is constructed to use a 5-bit index, consisting of the 3-bit size 0-7, a
130 * bit for the sign, and a bit for userland address. For example, a 4-byte
131 * signed load from userland would be at the following table index:
132 * user=1 sign=1 size=4 => binary index 11011 = decimal index 27
133 */
134 static uint_t
135 dt_cg_load(dt_node_t *dnp, ctf_file_t *ctfp, ctf_id_t type)
136 {
137 static const uint_t ops[] = {
138 DIF_OP_LDUB, DIF_OP_LDUH, 0, DIF_OP_LDUW,
139 0, 0, 0, DIF_OP_LDX,
140 DIF_OP_LDSB, DIF_OP_LDSH, 0, DIF_OP_LDSW,
141 0, 0, 0, DIF_OP_LDX,
142 DIF_OP_ULDUB, DIF_OP_ULDUH, 0, DIF_OP_ULDUW,
143 0, 0, 0, DIF_OP_ULDX,
144 DIF_OP_ULDSB, DIF_OP_ULDSH, 0, DIF_OP_ULDSW,
145 0, 0, 0, DIF_OP_ULDX,
146 };
147
148 ctf_encoding_t e;
149 ssize_t size;
150
151 /*
152 * If we're loading a bit-field, the size of our load is found by
153 * rounding cte_bits up to a byte boundary and then finding the
154 * nearest power of two to this value (see clp2(), above).
155 */
156 if ((dnp->dn_flags & DT_NF_BITFIELD) &&
157 ctf_type_encoding(ctfp, type, &e) != CTF_ERR)
158 size = clp2(P2ROUNDUP(e.cte_bits, NBBY) / NBBY);
159 else
160 size = ctf_type_size(ctfp, type);
161
162 if (size < 1 || size > 8 || (size & (size - 1)) != 0) {
163 xyerror(D_UNKNOWN, "internal error -- cg cannot load "
164 "size %ld when passed by value\n", (long)size);
165 }
166
167 size--; /* convert size to 3-bit index */
168
169 if (dnp->dn_flags & DT_NF_SIGNED)
170 size |= 0x08;
171 if (dnp->dn_flags & DT_NF_USERLAND)
172 size |= 0x10;
173
174 return (ops[size]);
175 }
176
177 static void
178 dt_cg_ptrsize(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp,
179 uint_t op, int dreg)
180 {
181 ctf_file_t *ctfp = dnp->dn_ctfp;
182 ctf_arinfo_t r;
183 dif_instr_t instr;
184 ctf_id_t type;
185 uint_t kind;
186 ssize_t size;
187 int sreg;
188
189 type = ctf_type_resolve(ctfp, dnp->dn_type);
190 kind = ctf_type_kind(ctfp, type);
191 assert(kind == CTF_K_POINTER || kind == CTF_K_ARRAY);
192
193 if (kind == CTF_K_ARRAY) {
194 if (ctf_array_info(ctfp, type, &r) != 0) {
195 yypcb->pcb_hdl->dt_ctferr = ctf_errno(ctfp);
196 longjmp(yypcb->pcb_jmpbuf, EDT_CTF);
197 }
198 type = r.ctr_contents;
199 } else
200 type = ctf_type_reference(ctfp, type);
201
202 if ((size = ctf_type_size(ctfp, type)) == 1)
203 return; /* multiply or divide by one can be omitted */
204
205 sreg = dt_regset_alloc(drp);
206 dt_cg_setx(dlp, sreg, size);
207 instr = DIF_INSTR_FMT(op, dreg, sreg, dreg);
208 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
209 dt_regset_free(drp, sreg);
210 }
211
212 /*
213 * If the result of a "." or "->" operation is a bit-field, we use this routine
214 * to generate an epilogue to the load instruction that extracts the value. In
215 * the diagrams below the "ld??" is the load instruction that is generated to
216 * load the containing word that is generating prior to calling this function.
217 *
218 * Epilogue for unsigned fields: Epilogue for signed fields:
219 *
220 * ldu? [r1], r1 lds? [r1], r1
221 * setx USHIFT, r2 setx 64 - SSHIFT, r2
222 * srl r1, r2, r1 sll r1, r2, r1
223 * setx (1 << bits) - 1, r2 setx 64 - bits, r2
224 * and r1, r2, r1 sra r1, r2, r1
225 *
226 * The *SHIFT constants above changes value depending on the endian-ness of our
227 * target architecture. Refer to the comments below for more details.
228 */
229 static void
230 dt_cg_field_get(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp,
231 ctf_file_t *fp, const ctf_membinfo_t *mp)
232 {
233 ctf_encoding_t e;
234 dif_instr_t instr;
235 uint64_t shift;
236 int r1, r2;
237
238 if (ctf_type_encoding(fp, mp->ctm_type, &e) != 0 || e.cte_bits > 64) {
239 xyerror(D_UNKNOWN, "cg: bad field: off %lu type <%ld> "
240 "bits %u\n", mp->ctm_offset, mp->ctm_type, e.cte_bits);
241 }
242
243 assert(dnp->dn_op == DT_TOK_PTR || dnp->dn_op == DT_TOK_DOT);
244 r1 = dnp->dn_left->dn_reg;
245 r2 = dt_regset_alloc(drp);
246
247 /*
248 * On little-endian architectures, ctm_offset counts from the right so
249 * ctm_offset % NBBY itself is the amount we want to shift right to
250 * move the value bits to the little end of the register to mask them.
251 * On big-endian architectures, ctm_offset counts from the left so we
252 * must subtract (ctm_offset % NBBY + cte_bits) from the size in bits
253 * we used for the load. The size of our load in turn is found by
254 * rounding cte_bits up to a byte boundary and then finding the
255 * nearest power of two to this value (see clp2(), above). These
256 * properties are used to compute shift as USHIFT or SSHIFT, below.
257 */
258 if (dnp->dn_flags & DT_NF_SIGNED) {
259 #ifdef _BIG_ENDIAN
260 shift = clp2(P2ROUNDUP(e.cte_bits, NBBY) / NBBY) * NBBY -
261 mp->ctm_offset % NBBY;
262 #else
263 shift = mp->ctm_offset % NBBY + e.cte_bits;
264 #endif
265 dt_cg_setx(dlp, r2, 64 - shift);
266 instr = DIF_INSTR_FMT(DIF_OP_SLL, r1, r2, r1);
267 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
268
269 dt_cg_setx(dlp, r2, 64 - e.cte_bits);
270 instr = DIF_INSTR_FMT(DIF_OP_SRA, r1, r2, r1);
271 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
272 } else {
273 #ifdef _BIG_ENDIAN
274 shift = clp2(P2ROUNDUP(e.cte_bits, NBBY) / NBBY) * NBBY -
275 (mp->ctm_offset % NBBY + e.cte_bits);
276 #else
277 shift = mp->ctm_offset % NBBY;
278 #endif
279 dt_cg_setx(dlp, r2, shift);
280 instr = DIF_INSTR_FMT(DIF_OP_SRL, r1, r2, r1);
281 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
282
283 dt_cg_setx(dlp, r2, (1ULL << e.cte_bits) - 1);
284 instr = DIF_INSTR_FMT(DIF_OP_AND, r1, r2, r1);
285 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
286 }
287
288 dt_regset_free(drp, r2);
289 }
290
291 /*
292 * If the destination of a store operation is a bit-field, we use this routine
293 * to generate a prologue to the store instruction that loads the surrounding
294 * bits, clears the destination field, and ORs in the new value of the field.
295 * In the diagram below the "st?" is the store instruction that is generated to
296 * store the containing word that is generating after calling this function.
297 *
298 * ld [dst->dn_reg], r1
299 * setx ~(((1 << cte_bits) - 1) << (ctm_offset % NBBY)), r2
300 * and r1, r2, r1
301 *
302 * setx (1 << cte_bits) - 1, r2
303 * and src->dn_reg, r2, r2
304 * setx ctm_offset % NBBY, r3
305 * sll r2, r3, r2
306 *
307 * or r1, r2, r1
308 * st? r1, [dst->dn_reg]
309 *
310 * This routine allocates a new register to hold the value to be stored and
311 * returns it. The caller is responsible for freeing this register later.
312 */
313 static int
314 dt_cg_field_set(dt_node_t *src, dt_irlist_t *dlp,
315 dt_regset_t *drp, dt_node_t *dst)
316 {
317 uint64_t cmask, fmask, shift;
318 dif_instr_t instr;
319 int r1, r2, r3;
320
321 ctf_membinfo_t m;
322 ctf_encoding_t e;
323 ctf_file_t *fp, *ofp;
324 ctf_id_t type;
325
326 assert(dst->dn_op == DT_TOK_PTR || dst->dn_op == DT_TOK_DOT);
327 assert(dst->dn_right->dn_kind == DT_NODE_IDENT);
328
329 fp = dst->dn_left->dn_ctfp;
330 type = ctf_type_resolve(fp, dst->dn_left->dn_type);
331
332 if (dst->dn_op == DT_TOK_PTR) {
333 type = ctf_type_reference(fp, type);
334 type = ctf_type_resolve(fp, type);
335 }
336
337 if ((fp = dt_cg_membinfo(ofp = fp, type,
338 dst->dn_right->dn_string, &m)) == NULL) {
339 yypcb->pcb_hdl->dt_ctferr = ctf_errno(ofp);
340 longjmp(yypcb->pcb_jmpbuf, EDT_CTF);
341 }
342
343 if (ctf_type_encoding(fp, m.ctm_type, &e) != 0 || e.cte_bits > 64) {
344 xyerror(D_UNKNOWN, "cg: bad field: off %lu type <%ld> "
345 "bits %u\n", m.ctm_offset, m.ctm_type, e.cte_bits);
346 }
347
348 r1 = dt_regset_alloc(drp);
349 r2 = dt_regset_alloc(drp);
350 r3 = dt_regset_alloc(drp);
351
352 /*
353 * Compute shifts and masks. We need to compute "shift" as the amount
354 * we need to shift left to position our field in the containing word.
355 * Refer to the comments in dt_cg_field_get(), above, for more info.
356 * We then compute fmask as the mask that truncates the value in the
357 * input register to width cte_bits, and cmask as the mask used to
358 * pass through the containing bits and zero the field bits.
359 */
360 #ifdef _BIG_ENDIAN
361 shift = clp2(P2ROUNDUP(e.cte_bits, NBBY) / NBBY) * NBBY -
362 (m.ctm_offset % NBBY + e.cte_bits);
363 #else
364 shift = m.ctm_offset % NBBY;
365 #endif
366 fmask = (1ULL << e.cte_bits) - 1;
367 cmask = ~(fmask << shift);
368
369 instr = DIF_INSTR_LOAD(
370 dt_cg_load(dst, fp, m.ctm_type), dst->dn_reg, r1);
371 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
372
373 dt_cg_setx(dlp, r2, cmask);
374 instr = DIF_INSTR_FMT(DIF_OP_AND, r1, r2, r1);
375 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
376
377 dt_cg_setx(dlp, r2, fmask);
378 instr = DIF_INSTR_FMT(DIF_OP_AND, src->dn_reg, r2, r2);
379 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
380
381 dt_cg_setx(dlp, r3, shift);
382 instr = DIF_INSTR_FMT(DIF_OP_SLL, r2, r3, r2);
383 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
384
385 instr = DIF_INSTR_FMT(DIF_OP_OR, r1, r2, r1);
386 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
387
388 dt_regset_free(drp, r3);
389 dt_regset_free(drp, r2);
390
391 return (r1);
392 }
393
394 static void
395 dt_cg_store(dt_node_t *src, dt_irlist_t *dlp, dt_regset_t *drp, dt_node_t *dst)
396 {
397 ctf_encoding_t e;
398 dif_instr_t instr;
399 size_t size;
400 int reg;
401
402 /*
403 * If we're loading a bit-field, the size of our store is found by
404 * rounding dst's cte_bits up to a byte boundary and then finding the
405 * nearest power of two to this value (see clp2(), above).
406 */
407 if ((dst->dn_flags & DT_NF_BITFIELD) &&
408 ctf_type_encoding(dst->dn_ctfp, dst->dn_type, &e) != CTF_ERR)
409 size = clp2(P2ROUNDUP(e.cte_bits, NBBY) / NBBY);
410 else
411 size = dt_node_type_size(src);
412
413 if (src->dn_flags & DT_NF_REF) {
414 reg = dt_regset_alloc(drp);
415 dt_cg_setx(dlp, reg, size);
416 instr = DIF_INSTR_COPYS(src->dn_reg, reg, dst->dn_reg);
417 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
418 dt_regset_free(drp, reg);
419 } else {
420 if (dst->dn_flags & DT_NF_BITFIELD)
421 reg = dt_cg_field_set(src, dlp, drp, dst);
422 else
423 reg = src->dn_reg;
424
425 switch (size) {
426 case 1:
427 instr = DIF_INSTR_STORE(DIF_OP_STB, reg, dst->dn_reg);
428 break;
429 case 2:
430 instr = DIF_INSTR_STORE(DIF_OP_STH, reg, dst->dn_reg);
431 break;
432 case 4:
433 instr = DIF_INSTR_STORE(DIF_OP_STW, reg, dst->dn_reg);
434 break;
435 case 8:
436 instr = DIF_INSTR_STORE(DIF_OP_STX, reg, dst->dn_reg);
437 break;
438 default:
439 xyerror(D_UNKNOWN, "internal error -- cg cannot store "
440 "size %lu when passed by value\n", (ulong_t)size);
441 }
442 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
443
444 if (dst->dn_flags & DT_NF_BITFIELD)
445 dt_regset_free(drp, reg);
446 }
447 }
448
449 /*
450 * Generate code for a typecast or for argument promotion from the type of the
451 * actual to the type of the formal. We need to generate code for casts when
452 * a scalar type is being narrowed or changing signed-ness. We first shift the
453 * desired bits high (losing excess bits if narrowing) and then shift them down
454 * using logical shift (unsigned result) or arithmetic shift (signed result).
455 */
456 static void
457 dt_cg_typecast(const dt_node_t *src, const dt_node_t *dst,
458 dt_irlist_t *dlp, dt_regset_t *drp)
459 {
460 size_t srcsize = dt_node_type_size(src);
461 size_t dstsize = dt_node_type_size(dst);
462
463 dif_instr_t instr;
464 int rg;
465
466 if (!dt_node_is_scalar(dst))
467 return; /* not a scalar */
468 if (dstsize == srcsize &&
469 ((src->dn_flags ^ dst->dn_flags) & DT_NF_SIGNED) == 0)
470 return; /* not narrowing or changing signed-ness */
471 if (dstsize > srcsize && (src->dn_flags & DT_NF_SIGNED) == 0)
472 return; /* nothing to do in this case */
473
474 rg = dt_regset_alloc(drp);
475
476 if (dstsize > srcsize) {
477 int n = sizeof (uint64_t) * NBBY - srcsize * NBBY;
478 int s = (dstsize - srcsize) * NBBY;
479
480 dt_cg_setx(dlp, rg, n);
481
482 instr = DIF_INSTR_FMT(DIF_OP_SLL, src->dn_reg, rg, dst->dn_reg);
483 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
484
485 if ((dst->dn_flags & DT_NF_SIGNED) || n == s) {
486 instr = DIF_INSTR_FMT(DIF_OP_SRA,
487 dst->dn_reg, rg, dst->dn_reg);
488 dt_irlist_append(dlp,
489 dt_cg_node_alloc(DT_LBL_NONE, instr));
490 } else {
491 dt_cg_setx(dlp, rg, s);
492 instr = DIF_INSTR_FMT(DIF_OP_SRA,
493 dst->dn_reg, rg, dst->dn_reg);
494 dt_irlist_append(dlp,
495 dt_cg_node_alloc(DT_LBL_NONE, instr));
496 dt_cg_setx(dlp, rg, n - s);
497 instr = DIF_INSTR_FMT(DIF_OP_SRL,
498 dst->dn_reg, rg, dst->dn_reg);
499 dt_irlist_append(dlp,
500 dt_cg_node_alloc(DT_LBL_NONE, instr));
501 }
502 } else if (dstsize != sizeof (uint64_t)) {
503 int n = sizeof (uint64_t) * NBBY - dstsize * NBBY;
504
505 dt_cg_setx(dlp, rg, n);
506
507 instr = DIF_INSTR_FMT(DIF_OP_SLL, src->dn_reg, rg, dst->dn_reg);
508 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
509
510 instr = DIF_INSTR_FMT((dst->dn_flags & DT_NF_SIGNED) ?
511 DIF_OP_SRA : DIF_OP_SRL, dst->dn_reg, rg, dst->dn_reg);
512 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
513 }
514
515 dt_regset_free(drp, rg);
516 }
517
518 /*
519 * Generate code to push the specified argument list on to the tuple stack.
520 * We use this routine for handling subroutine calls and associative arrays.
521 * We must first generate code for all subexpressions before loading the stack
522 * because any subexpression could itself require the use of the tuple stack.
523 * This holds a number of registers equal to the number of arguments, but this
524 * is not a huge problem because the number of arguments can't exceed the
525 * number of tuple register stack elements anyway. At most one extra register
526 * is required (either by dt_cg_typecast() or for dtdt_size, below). This
527 * implies that a DIF implementation should offer a number of general purpose
528 * registers at least one greater than the number of tuple registers.
529 */
530 static void
531 dt_cg_arglist(dt_ident_t *idp, dt_node_t *args,
532 dt_irlist_t *dlp, dt_regset_t *drp)
533 {
534 const dt_idsig_t *isp = idp->di_data;
535 dt_node_t *dnp;
536 int i = 0;
537
538 for (dnp = args; dnp != NULL; dnp = dnp->dn_list)
539 dt_cg_node(dnp, dlp, drp);
540
541 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, DIF_INSTR_FLUSHTS));
542
543 for (dnp = args; dnp != NULL; dnp = dnp->dn_list, i++) {
544 dtrace_diftype_t t;
545 dif_instr_t instr;
546 uint_t op;
547 int reg;
548
549 dt_node_diftype(yypcb->pcb_hdl, dnp, &t);
550
551 isp->dis_args[i].dn_reg = dnp->dn_reg; /* re-use register */
552 dt_cg_typecast(dnp, &isp->dis_args[i], dlp, drp);
553 isp->dis_args[i].dn_reg = -1;
554
555 if (t.dtdt_flags & DIF_TF_BYREF) {
556 op = DIF_OP_PUSHTR;
557 if (t.dtdt_size != 0) {
558 reg = dt_regset_alloc(drp);
559 dt_cg_setx(dlp, reg, t.dtdt_size);
560 } else {
561 reg = DIF_REG_R0;
562 }
563 } else {
564 op = DIF_OP_PUSHTV;
565 reg = DIF_REG_R0;
566 }
567
568 instr = DIF_INSTR_PUSHTS(op, t.dtdt_kind, reg, dnp->dn_reg);
569 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
570 dt_regset_free(drp, dnp->dn_reg);
571
572 if (reg != DIF_REG_R0)
573 dt_regset_free(drp, reg);
574 }
575
576 if (i > yypcb->pcb_hdl->dt_conf.dtc_diftupregs)
577 longjmp(yypcb->pcb_jmpbuf, EDT_NOTUPREG);
578 }
579
580 static void
581 dt_cg_arithmetic_op(dt_node_t *dnp, dt_irlist_t *dlp,
582 dt_regset_t *drp, uint_t op)
583 {
584 int is_ptr_op = (dnp->dn_op == DT_TOK_ADD || dnp->dn_op == DT_TOK_SUB ||
585 dnp->dn_op == DT_TOK_ADD_EQ || dnp->dn_op == DT_TOK_SUB_EQ);
586
587 int lp_is_ptr = dt_node_is_pointer(dnp->dn_left);
588 int rp_is_ptr = dt_node_is_pointer(dnp->dn_right);
589
590 dif_instr_t instr;
591
592 if (lp_is_ptr && rp_is_ptr) {
593 assert(dnp->dn_op == DT_TOK_SUB);
594 is_ptr_op = 0;
595 }
596
597 dt_cg_node(dnp->dn_left, dlp, drp);
598 if (is_ptr_op && rp_is_ptr)
599 dt_cg_ptrsize(dnp, dlp, drp, DIF_OP_MUL, dnp->dn_left->dn_reg);
600
601 dt_cg_node(dnp->dn_right, dlp, drp);
602 if (is_ptr_op && lp_is_ptr)
603 dt_cg_ptrsize(dnp, dlp, drp, DIF_OP_MUL, dnp->dn_right->dn_reg);
604
605 instr = DIF_INSTR_FMT(op, dnp->dn_left->dn_reg,
606 dnp->dn_right->dn_reg, dnp->dn_left->dn_reg);
607
608 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
609 dt_regset_free(drp, dnp->dn_right->dn_reg);
610 dnp->dn_reg = dnp->dn_left->dn_reg;
611
612 if (lp_is_ptr && rp_is_ptr)
613 dt_cg_ptrsize(dnp->dn_right,
614 dlp, drp, DIF_OP_UDIV, dnp->dn_reg);
615 }
616
617 static uint_t
618 dt_cg_stvar(const dt_ident_t *idp)
619 {
620 static const uint_t aops[] = { DIF_OP_STGAA, DIF_OP_STTAA, DIF_OP_NOP };
621 static const uint_t sops[] = { DIF_OP_STGS, DIF_OP_STTS, DIF_OP_STLS };
622
623 uint_t i = (((idp->di_flags & DT_IDFLG_LOCAL) != 0) << 1) |
624 ((idp->di_flags & DT_IDFLG_TLS) != 0);
625
626 return (idp->di_kind == DT_IDENT_ARRAY ? aops[i] : sops[i]);
627 }
628
629 static void
630 dt_cg_prearith_op(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp, uint_t op)
631 {
632 ctf_file_t *ctfp = dnp->dn_ctfp;
633 dif_instr_t instr;
634 ctf_id_t type;
635 ssize_t size = 1;
636 int reg;
637
638 if (dt_node_is_pointer(dnp)) {
639 type = ctf_type_resolve(ctfp, dnp->dn_type);
640 assert(ctf_type_kind(ctfp, type) == CTF_K_POINTER);
641 size = ctf_type_size(ctfp, ctf_type_reference(ctfp, type));
642 }
643
644 dt_cg_node(dnp->dn_child, dlp, drp);
645 dnp->dn_reg = dnp->dn_child->dn_reg;
646
647 reg = dt_regset_alloc(drp);
648 dt_cg_setx(dlp, reg, size);
649
650 instr = DIF_INSTR_FMT(op, dnp->dn_reg, reg, dnp->dn_reg);
651 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
652 dt_regset_free(drp, reg);
653
654 /*
655 * If we are modifying a variable, generate an stv instruction from
656 * the variable specified by the identifier. If we are storing to a
657 * memory address, generate code again for the left-hand side using
658 * DT_NF_REF to get the address, and then generate a store to it.
659 * In both paths, we store the value in dnp->dn_reg (the new value).
660 */
661 if (dnp->dn_child->dn_kind == DT_NODE_VAR) {
662 dt_ident_t *idp = dt_ident_resolve(dnp->dn_child->dn_ident);
663
664 idp->di_flags |= DT_IDFLG_DIFW;
665 instr = DIF_INSTR_STV(dt_cg_stvar(idp),
666 idp->di_id, dnp->dn_reg);
667 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
668 } else {
669 uint_t rbit = dnp->dn_child->dn_flags & DT_NF_REF;
670
671 assert(dnp->dn_child->dn_flags & DT_NF_WRITABLE);
672 assert(dnp->dn_child->dn_flags & DT_NF_LVALUE);
673
674 dnp->dn_child->dn_flags |= DT_NF_REF; /* force pass-by-ref */
675 dt_cg_node(dnp->dn_child, dlp, drp);
676
677 dt_cg_store(dnp, dlp, drp, dnp->dn_child);
678 dt_regset_free(drp, dnp->dn_child->dn_reg);
679
680 dnp->dn_left->dn_flags &= ~DT_NF_REF;
681 dnp->dn_left->dn_flags |= rbit;
682 }
683 }
684
685 static void
686 dt_cg_postarith_op(dt_node_t *dnp, dt_irlist_t *dlp,
687 dt_regset_t *drp, uint_t op)
688 {
689 ctf_file_t *ctfp = dnp->dn_ctfp;
690 dif_instr_t instr;
691 ctf_id_t type;
692 ssize_t size = 1;
693 int nreg;
694
695 if (dt_node_is_pointer(dnp)) {
696 type = ctf_type_resolve(ctfp, dnp->dn_type);
697 assert(ctf_type_kind(ctfp, type) == CTF_K_POINTER);
698 size = ctf_type_size(ctfp, ctf_type_reference(ctfp, type));
699 }
700
701 dt_cg_node(dnp->dn_child, dlp, drp);
702 dnp->dn_reg = dnp->dn_child->dn_reg;
703
704 nreg = dt_regset_alloc(drp);
705 dt_cg_setx(dlp, nreg, size);
706 instr = DIF_INSTR_FMT(op, dnp->dn_reg, nreg, nreg);
707 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
708
709 /*
710 * If we are modifying a variable, generate an stv instruction from
711 * the variable specified by the identifier. If we are storing to a
712 * memory address, generate code again for the left-hand side using
713 * DT_NF_REF to get the address, and then generate a store to it.
714 * In both paths, we store the value from 'nreg' (the new value).
715 */
716 if (dnp->dn_child->dn_kind == DT_NODE_VAR) {
717 dt_ident_t *idp = dt_ident_resolve(dnp->dn_child->dn_ident);
718
719 idp->di_flags |= DT_IDFLG_DIFW;
720 instr = DIF_INSTR_STV(dt_cg_stvar(idp), idp->di_id, nreg);
721 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
722 } else {
723 uint_t rbit = dnp->dn_child->dn_flags & DT_NF_REF;
724 int oreg = dnp->dn_reg;
725
726 assert(dnp->dn_child->dn_flags & DT_NF_WRITABLE);
727 assert(dnp->dn_child->dn_flags & DT_NF_LVALUE);
728
729 dnp->dn_child->dn_flags |= DT_NF_REF; /* force pass-by-ref */
730 dt_cg_node(dnp->dn_child, dlp, drp);
731
732 dnp->dn_reg = nreg;
733 dt_cg_store(dnp, dlp, drp, dnp->dn_child);
734 dnp->dn_reg = oreg;
735
736 dt_regset_free(drp, dnp->dn_child->dn_reg);
737 dnp->dn_left->dn_flags &= ~DT_NF_REF;
738 dnp->dn_left->dn_flags |= rbit;
739 }
740
741 dt_regset_free(drp, nreg);
742 }
743
744 /*
745 * Determine if we should perform signed or unsigned comparison for an OP2.
746 * If both operands are of arithmetic type, perform the usual arithmetic
747 * conversions to determine the common real type for comparison [ISOC 6.5.8.3].
748 */
749 static int
750 dt_cg_compare_signed(dt_node_t *dnp)
751 {
752 dt_node_t dn;
753
754 if (dt_node_is_string(dnp->dn_left) ||
755 dt_node_is_string(dnp->dn_right))
756 return (1); /* strings always compare signed */
757 else if (!dt_node_is_arith(dnp->dn_left) ||
758 !dt_node_is_arith(dnp->dn_right))
759 return (0); /* non-arithmetic types always compare unsigned */
760
761 bzero(&dn, sizeof (dn));
762 dt_node_promote(dnp->dn_left, dnp->dn_right, &dn);
763 return (dn.dn_flags & DT_NF_SIGNED);
764 }
765
766 static void
767 dt_cg_compare_op(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp, uint_t op)
768 {
769 uint_t lbl_true = dt_irlist_label(dlp);
770 uint_t lbl_post = dt_irlist_label(dlp);
771
772 dif_instr_t instr;
773 uint_t opc;
774
775 dt_cg_node(dnp->dn_left, dlp, drp);
776 dt_cg_node(dnp->dn_right, dlp, drp);
777
778 if (dt_node_is_string(dnp->dn_left) || dt_node_is_string(dnp->dn_right))
779 opc = DIF_OP_SCMP;
780 else
781 opc = DIF_OP_CMP;
782
783 instr = DIF_INSTR_CMP(opc, dnp->dn_left->dn_reg, dnp->dn_right->dn_reg);
784 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
785 dt_regset_free(drp, dnp->dn_right->dn_reg);
786 dnp->dn_reg = dnp->dn_left->dn_reg;
787
788 instr = DIF_INSTR_BRANCH(op, lbl_true);
789 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
790
791 instr = DIF_INSTR_MOV(DIF_REG_R0, dnp->dn_reg);
792 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
793
794 instr = DIF_INSTR_BRANCH(DIF_OP_BA, lbl_post);
795 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
796
797 dt_cg_xsetx(dlp, NULL, lbl_true, dnp->dn_reg, 1);
798 dt_irlist_append(dlp, dt_cg_node_alloc(lbl_post, DIF_INSTR_NOP));
799 }
800
801 /*
802 * Code generation for the ternary op requires some trickery with the assembler
803 * in order to conserve registers. We generate code for dn_expr and dn_left
804 * and free their registers so they do not have be consumed across codegen for
805 * dn_right. We insert a dummy MOV at the end of dn_left into the destination
806 * register, which is not yet known because we haven't done dn_right yet, and
807 * save the pointer to this instruction node. We then generate code for
808 * dn_right and use its register as our output. Finally, we reach back and
809 * patch the instruction for dn_left to move its output into this register.
810 */
811 static void
812 dt_cg_ternary_op(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp)
813 {
814 uint_t lbl_false = dt_irlist_label(dlp);
815 uint_t lbl_post = dt_irlist_label(dlp);
816
817 dif_instr_t instr;
818 dt_irnode_t *dip;
819
820 dt_cg_node(dnp->dn_expr, dlp, drp);
821 instr = DIF_INSTR_TST(dnp->dn_expr->dn_reg);
822 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
823 dt_regset_free(drp, dnp->dn_expr->dn_reg);
824
825 instr = DIF_INSTR_BRANCH(DIF_OP_BE, lbl_false);
826 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
827
828 dt_cg_node(dnp->dn_left, dlp, drp);
829 instr = DIF_INSTR_MOV(dnp->dn_left->dn_reg, DIF_REG_R0);
830 dip = dt_cg_node_alloc(DT_LBL_NONE, instr); /* save dip for below */
831 dt_irlist_append(dlp, dip);
832 dt_regset_free(drp, dnp->dn_left->dn_reg);
833
834 instr = DIF_INSTR_BRANCH(DIF_OP_BA, lbl_post);
835 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
836
837 dt_irlist_append(dlp, dt_cg_node_alloc(lbl_false, DIF_INSTR_NOP));
838 dt_cg_node(dnp->dn_right, dlp, drp);
839 dnp->dn_reg = dnp->dn_right->dn_reg;
840
841 /*
842 * Now that dn_reg is assigned, reach back and patch the correct MOV
843 * instruction into the tail of dn_left. We know dn_reg was unused
844 * at that point because otherwise dn_right couldn't have allocated it.
845 */
846 dip->di_instr = DIF_INSTR_MOV(dnp->dn_left->dn_reg, dnp->dn_reg);
847 dt_irlist_append(dlp, dt_cg_node_alloc(lbl_post, DIF_INSTR_NOP));
848 }
849
850 static void
851 dt_cg_logical_and(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp)
852 {
853 uint_t lbl_false = dt_irlist_label(dlp);
854 uint_t lbl_post = dt_irlist_label(dlp);
855
856 dif_instr_t instr;
857
858 dt_cg_node(dnp->dn_left, dlp, drp);
859 instr = DIF_INSTR_TST(dnp->dn_left->dn_reg);
860 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
861 dt_regset_free(drp, dnp->dn_left->dn_reg);
862
863 instr = DIF_INSTR_BRANCH(DIF_OP_BE, lbl_false);
864 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
865
866 dt_cg_node(dnp->dn_right, dlp, drp);
867 instr = DIF_INSTR_TST(dnp->dn_right->dn_reg);
868 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
869 dnp->dn_reg = dnp->dn_right->dn_reg;
870
871 instr = DIF_INSTR_BRANCH(DIF_OP_BE, lbl_false);
872 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
873
874 dt_cg_setx(dlp, dnp->dn_reg, 1);
875
876 instr = DIF_INSTR_BRANCH(DIF_OP_BA, lbl_post);
877 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
878
879 instr = DIF_INSTR_MOV(DIF_REG_R0, dnp->dn_reg);
880 dt_irlist_append(dlp, dt_cg_node_alloc(lbl_false, instr));
881
882 dt_irlist_append(dlp, dt_cg_node_alloc(lbl_post, DIF_INSTR_NOP));
883 }
884
885 static void
886 dt_cg_logical_xor(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp)
887 {
888 uint_t lbl_next = dt_irlist_label(dlp);
889 uint_t lbl_tail = dt_irlist_label(dlp);
890
891 dif_instr_t instr;
892
893 dt_cg_node(dnp->dn_left, dlp, drp);
894 instr = DIF_INSTR_TST(dnp->dn_left->dn_reg);
895 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
896
897 instr = DIF_INSTR_BRANCH(DIF_OP_BE, lbl_next);
898 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
899 dt_cg_setx(dlp, dnp->dn_left->dn_reg, 1);
900
901 dt_irlist_append(dlp, dt_cg_node_alloc(lbl_next, DIF_INSTR_NOP));
902 dt_cg_node(dnp->dn_right, dlp, drp);
903
904 instr = DIF_INSTR_TST(dnp->dn_right->dn_reg);
905 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
906
907 instr = DIF_INSTR_BRANCH(DIF_OP_BE, lbl_tail);
908 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
909 dt_cg_setx(dlp, dnp->dn_right->dn_reg, 1);
910
911 instr = DIF_INSTR_FMT(DIF_OP_XOR, dnp->dn_left->dn_reg,
912 dnp->dn_right->dn_reg, dnp->dn_left->dn_reg);
913
914 dt_irlist_append(dlp, dt_cg_node_alloc(lbl_tail, instr));
915
916 dt_regset_free(drp, dnp->dn_right->dn_reg);
917 dnp->dn_reg = dnp->dn_left->dn_reg;
918 }
919
920 static void
921 dt_cg_logical_or(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp)
922 {
923 uint_t lbl_true = dt_irlist_label(dlp);
924 uint_t lbl_false = dt_irlist_label(dlp);
925 uint_t lbl_post = dt_irlist_label(dlp);
926
927 dif_instr_t instr;
928
929 dt_cg_node(dnp->dn_left, dlp, drp);
930 instr = DIF_INSTR_TST(dnp->dn_left->dn_reg);
931 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
932 dt_regset_free(drp, dnp->dn_left->dn_reg);
933
934 instr = DIF_INSTR_BRANCH(DIF_OP_BNE, lbl_true);
935 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
936
937 dt_cg_node(dnp->dn_right, dlp, drp);
938 instr = DIF_INSTR_TST(dnp->dn_right->dn_reg);
939 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
940 dnp->dn_reg = dnp->dn_right->dn_reg;
941
942 instr = DIF_INSTR_BRANCH(DIF_OP_BE, lbl_false);
943 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
944
945 dt_cg_xsetx(dlp, NULL, lbl_true, dnp->dn_reg, 1);
946
947 instr = DIF_INSTR_BRANCH(DIF_OP_BA, lbl_post);
948 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
949
950 instr = DIF_INSTR_MOV(DIF_REG_R0, dnp->dn_reg);
951 dt_irlist_append(dlp, dt_cg_node_alloc(lbl_false, instr));
952
953 dt_irlist_append(dlp, dt_cg_node_alloc(lbl_post, DIF_INSTR_NOP));
954 }
955
956 static void
957 dt_cg_logical_neg(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp)
958 {
959 uint_t lbl_zero = dt_irlist_label(dlp);
960 uint_t lbl_post = dt_irlist_label(dlp);
961
962 dif_instr_t instr;
963
964 dt_cg_node(dnp->dn_child, dlp, drp);
965 dnp->dn_reg = dnp->dn_child->dn_reg;
966
967 instr = DIF_INSTR_TST(dnp->dn_reg);
968 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
969
970 instr = DIF_INSTR_BRANCH(DIF_OP_BE, lbl_zero);
971 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
972
973 instr = DIF_INSTR_MOV(DIF_REG_R0, dnp->dn_reg);
974 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
975
976 instr = DIF_INSTR_BRANCH(DIF_OP_BA, lbl_post);
977 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
978
979 dt_cg_xsetx(dlp, NULL, lbl_zero, dnp->dn_reg, 1);
980 dt_irlist_append(dlp, dt_cg_node_alloc(lbl_post, DIF_INSTR_NOP));
981 }
982
983 static void
984 dt_cg_asgn_op(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp)
985 {
986 dif_instr_t instr;
987 dt_ident_t *idp;
988
989 /*
990 * If we are performing a structure assignment of a translated type,
991 * we must instantiate all members and create a snapshot of the object
992 * in scratch space. We allocs a chunk of memory, generate code for
993 * each member, and then set dnp->dn_reg to the scratch object address.
994 */
995 if ((idp = dt_node_resolve(dnp->dn_right, DT_IDENT_XLSOU)) != NULL) {
996 ctf_membinfo_t ctm;
997 dt_xlator_t *dxp = idp->di_data;
998 dt_node_t *mnp, dn, mn;
999 int r1, r2;
1000
1001 /*
1002 * Create two fake dt_node_t's representing operator "." and a
1003 * right-hand identifier child node. These will be repeatedly
1004 * modified according to each instantiated member so that we
1005 * can pass them to dt_cg_store() and effect a member store.
1006 */
1007 bzero(&dn, sizeof (dt_node_t));
1008 dn.dn_kind = DT_NODE_OP2;
1009 dn.dn_op = DT_TOK_DOT;
1010 dn.dn_left = dnp;
1011 dn.dn_right = &mn;
1012
1013 bzero(&mn, sizeof (dt_node_t));
1014 mn.dn_kind = DT_NODE_IDENT;
1015 mn.dn_op = DT_TOK_IDENT;
1016
1017 /*
1018 * Allocate a register for our scratch data pointer. First we
1019 * set it to the size of our data structure, and then replace
1020 * it with the result of an allocs of the specified size.
1021 */
1022 r1 = dt_regset_alloc(drp);
1023 dt_cg_setx(dlp, r1,
1024 ctf_type_size(dxp->dx_dst_ctfp, dxp->dx_dst_base));
1025
1026 instr = DIF_INSTR_ALLOCS(r1, r1);
1027 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1028
1029 /*
1030 * When dt_cg_asgn_op() is called, we have already generated
1031 * code for dnp->dn_right, which is the translator input. We
1032 * now associate this register with the translator's input
1033 * identifier so it can be referenced during our member loop.
1034 */
1035 dxp->dx_ident->di_flags |= DT_IDFLG_CGREG;
1036 dxp->dx_ident->di_id = dnp->dn_right->dn_reg;
1037
1038 for (mnp = dxp->dx_members; mnp != NULL; mnp = mnp->dn_list) {
1039 /*
1040 * Generate code for the translator member expression,
1041 * and then cast the result to the member type.
1042 */
1043 dt_cg_node(mnp->dn_membexpr, dlp, drp);
1044 mnp->dn_reg = mnp->dn_membexpr->dn_reg;
1045 dt_cg_typecast(mnp->dn_membexpr, mnp, dlp, drp);
1046
1047 /*
1048 * Ask CTF for the offset of the member so we can store
1049 * to the appropriate offset. This call has already
1050 * been done once by the parser, so it should succeed.
1051 */
1052 if (ctf_member_info(dxp->dx_dst_ctfp, dxp->dx_dst_base,
1053 mnp->dn_membname, &ctm) == CTF_ERR) {
1054 yypcb->pcb_hdl->dt_ctferr =
1055 ctf_errno(dxp->dx_dst_ctfp);
1056 longjmp(yypcb->pcb_jmpbuf, EDT_CTF);
1057 }
1058
1059 /*
1060 * If the destination member is at offset 0, store the
1061 * result directly to r1 (the scratch buffer address).
1062 * Otherwise allocate another temporary for the offset
1063 * and add r1 to it before storing the result.
1064 */
1065 if (ctm.ctm_offset != 0) {
1066 r2 = dt_regset_alloc(drp);
1067
1068 /*
1069 * Add the member offset rounded down to the
1070 * nearest byte. If the offset was not aligned
1071 * on a byte boundary, this member is a bit-
1072 * field and dt_cg_store() will handle masking.
1073 */
1074 dt_cg_setx(dlp, r2, ctm.ctm_offset / NBBY);
1075 instr = DIF_INSTR_FMT(DIF_OP_ADD, r1, r2, r2);
1076 dt_irlist_append(dlp,
1077 dt_cg_node_alloc(DT_LBL_NONE, instr));
1078
1079 dt_node_type_propagate(mnp, &dn);
1080 dn.dn_right->dn_string = mnp->dn_membname;
1081 dn.dn_reg = r2;
1082
1083 dt_cg_store(mnp, dlp, drp, &dn);
1084 dt_regset_free(drp, r2);
1085
1086 } else {
1087 dt_node_type_propagate(mnp, &dn);
1088 dn.dn_right->dn_string = mnp->dn_membname;
1089 dn.dn_reg = r1;
1090
1091 dt_cg_store(mnp, dlp, drp, &dn);
1092 }
1093
1094 dt_regset_free(drp, mnp->dn_reg);
1095 }
1096
1097 dxp->dx_ident->di_flags &= ~DT_IDFLG_CGREG;
1098 dxp->dx_ident->di_id = 0;
1099
1100 if (dnp->dn_right->dn_reg != -1)
1101 dt_regset_free(drp, dnp->dn_right->dn_reg);
1102
1103 assert(dnp->dn_reg == dnp->dn_right->dn_reg);
1104 dnp->dn_reg = r1;
1105 }
1106
1107 /*
1108 * If we are storing to a variable, generate an stv instruction from
1109 * the variable specified by the identifier. If we are storing to a
1110 * memory address, generate code again for the left-hand side using
1111 * DT_NF_REF to get the address, and then generate a store to it.
1112 * In both paths, we assume dnp->dn_reg already has the new value.
1113 */
1114 if (dnp->dn_left->dn_kind == DT_NODE_VAR) {
1115 idp = dt_ident_resolve(dnp->dn_left->dn_ident);
1116
1117 if (idp->di_kind == DT_IDENT_ARRAY)
1118 dt_cg_arglist(idp, dnp->dn_left->dn_args, dlp, drp);
1119
1120 idp->di_flags |= DT_IDFLG_DIFW;
1121 instr = DIF_INSTR_STV(dt_cg_stvar(idp),
1122 idp->di_id, dnp->dn_reg);
1123 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1124 } else {
1125 uint_t rbit = dnp->dn_left->dn_flags & DT_NF_REF;
1126
1127 assert(dnp->dn_left->dn_flags & DT_NF_WRITABLE);
1128 assert(dnp->dn_left->dn_flags & DT_NF_LVALUE);
1129
1130 dnp->dn_left->dn_flags |= DT_NF_REF; /* force pass-by-ref */
1131
1132 dt_cg_node(dnp->dn_left, dlp, drp);
1133 dt_cg_store(dnp, dlp, drp, dnp->dn_left);
1134 dt_regset_free(drp, dnp->dn_left->dn_reg);
1135
1136 dnp->dn_left->dn_flags &= ~DT_NF_REF;
1137 dnp->dn_left->dn_flags |= rbit;
1138 }
1139 }
1140
1141 static void
1142 dt_cg_assoc_op(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp)
1143 {
1144 dif_instr_t instr;
1145 uint_t op;
1146
1147 assert(dnp->dn_kind == DT_NODE_VAR);
1148 assert(!(dnp->dn_ident->di_flags & DT_IDFLG_LOCAL));
1149 assert(dnp->dn_args != NULL);
1150
1151 dt_cg_arglist(dnp->dn_ident, dnp->dn_args, dlp, drp);
1152
1153 dnp->dn_reg = dt_regset_alloc(drp);
1154
1155 if (dnp->dn_ident->di_flags & DT_IDFLG_TLS)
1156 op = DIF_OP_LDTAA;
1157 else
1158 op = DIF_OP_LDGAA;
1159
1160 dnp->dn_ident->di_flags |= DT_IDFLG_DIFR;
1161 instr = DIF_INSTR_LDV(op, dnp->dn_ident->di_id, dnp->dn_reg);
1162 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1163
1164 /*
1165 * If the associative array is a pass-by-reference type, then we are
1166 * loading its value as a pointer to either load or store through it.
1167 * The array element in question may not have been faulted in yet, in
1168 * which case DIF_OP_LD*AA will return zero. We append an epilogue
1169 * of instructions similar to the following:
1170 *
1171 * ld?aa id, %r1 ! base ld?aa instruction above
1172 * tst %r1 ! start of epilogue
1173 * +--- bne label
1174 * | setx size, %r1
1175 * | allocs %r1, %r1
1176 * | st?aa id, %r1
1177 * | ld?aa id, %r1
1178 * v
1179 * label: < rest of code >
1180 *
1181 * The idea is that we allocs a zero-filled chunk of scratch space and
1182 * do a DIF_OP_ST*AA to fault in and initialize the array element, and
1183 * then reload it to get the faulted-in address of the new variable
1184 * storage. This isn't cheap, but pass-by-ref associative array values
1185 * are (thus far) uncommon and the allocs cost only occurs once. If
1186 * this path becomes important to DTrace users, we can improve things
1187 * by adding a new DIF opcode to fault in associative array elements.
1188 */
1189 if (dnp->dn_flags & DT_NF_REF) {
1190 uint_t stvop = op == DIF_OP_LDTAA ? DIF_OP_STTAA : DIF_OP_STGAA;
1191 uint_t label = dt_irlist_label(dlp);
1192
1193 instr = DIF_INSTR_TST(dnp->dn_reg);
1194 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1195
1196 instr = DIF_INSTR_BRANCH(DIF_OP_BNE, label);
1197 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1198
1199 dt_cg_setx(dlp, dnp->dn_reg, dt_node_type_size(dnp));
1200 instr = DIF_INSTR_ALLOCS(dnp->dn_reg, dnp->dn_reg);
1201 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1202
1203 dnp->dn_ident->di_flags |= DT_IDFLG_DIFW;
1204 instr = DIF_INSTR_STV(stvop, dnp->dn_ident->di_id, dnp->dn_reg);
1205 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1206
1207 instr = DIF_INSTR_LDV(op, dnp->dn_ident->di_id, dnp->dn_reg);
1208 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1209
1210 dt_irlist_append(dlp, dt_cg_node_alloc(label, DIF_INSTR_NOP));
1211 }
1212 }
1213
1214 static void
1215 dt_cg_array_op(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp)
1216 {
1217 dt_probe_t *prp = yypcb->pcb_probe;
1218 uintmax_t saved = dnp->dn_args->dn_value;
1219 dt_ident_t *idp = dnp->dn_ident;
1220
1221 dif_instr_t instr;
1222 uint_t op;
1223 size_t size;
1224 int reg, n;
1225
1226 assert(dnp->dn_kind == DT_NODE_VAR);
1227 assert(!(idp->di_flags & DT_IDFLG_LOCAL));
1228
1229 assert(dnp->dn_args->dn_kind == DT_NODE_INT);
1230 assert(dnp->dn_args->dn_list == NULL);
1231
1232 /*
1233 * If this is a reference in the args[] array, temporarily modify the
1234 * array index according to the static argument mapping (if any),
1235 * unless the argument reference is provided by a dynamic translator.
1236 * If we're using a dynamic translator for args[], then just set dn_reg
1237 * to an invalid reg and return: DIF_OP_XLARG will fetch the arg later.
1238 */
1239 if (idp->di_id == DIF_VAR_ARGS) {
1240 if ((idp->di_kind == DT_IDENT_XLPTR ||
1241 idp->di_kind == DT_IDENT_XLSOU) &&
1242 dt_xlator_dynamic(idp->di_data)) {
1243 dnp->dn_reg = -1;
1244 return;
1245 }
1246 dnp->dn_args->dn_value = prp->pr_mapping[saved];
1247 }
1248
1249 dt_cg_node(dnp->dn_args, dlp, drp);
1250 dnp->dn_args->dn_value = saved;
1251
1252 dnp->dn_reg = dnp->dn_args->dn_reg;
1253
1254 if (idp->di_flags & DT_IDFLG_TLS)
1255 op = DIF_OP_LDTA;
1256 else
1257 op = DIF_OP_LDGA;
1258
1259 idp->di_flags |= DT_IDFLG_DIFR;
1260
1261 instr = DIF_INSTR_LDA(op, idp->di_id,
1262 dnp->dn_args->dn_reg, dnp->dn_reg);
1263
1264 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1265
1266 /*
1267 * If this is a reference to the args[] array, we need to take the
1268 * additional step of explicitly eliminating any bits larger than the
1269 * type size: the DIF interpreter in the kernel will always give us
1270 * the raw (64-bit) argument value, and any bits larger than the type
1271 * size may be junk. As a practical matter, this arises only on 64-bit
1272 * architectures and only when the argument index is larger than the
1273 * number of arguments passed directly to DTrace: if a 8-, 16- or
1274 * 32-bit argument must be retrieved from the stack, it is possible
1275 * (and it some cases, likely) that the upper bits will be garbage.
1276 */
1277 if (idp->di_id != DIF_VAR_ARGS || !dt_node_is_scalar(dnp))
1278 return;
1279
1280 if ((size = dt_node_type_size(dnp)) == sizeof (uint64_t))
1281 return;
1282
1283 reg = dt_regset_alloc(drp);
1284 assert(size < sizeof (uint64_t));
1285 n = sizeof (uint64_t) * NBBY - size * NBBY;
1286
1287 dt_cg_setx(dlp, reg, n);
1288
1289 instr = DIF_INSTR_FMT(DIF_OP_SLL, dnp->dn_reg, reg, dnp->dn_reg);
1290 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1291
1292 instr = DIF_INSTR_FMT((dnp->dn_flags & DT_NF_SIGNED) ?
1293 DIF_OP_SRA : DIF_OP_SRL, dnp->dn_reg, reg, dnp->dn_reg);
1294
1295 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1296 dt_regset_free(drp, reg);
1297 }
1298
1299 /*
1300 * Generate code for an inlined variable reference. Inlines can be used to
1301 * define either scalar or associative array substitutions. For scalars, we
1302 * simply generate code for the parse tree saved in the identifier's din_root,
1303 * and then cast the resulting expression to the inline's declaration type.
1304 * For arrays, we take the input parameter subtrees from dnp->dn_args and
1305 * temporarily store them in the din_root of each din_argv[i] identifier,
1306 * which are themselves inlines and were set up for us by the parser. The
1307 * result is that any reference to the inlined parameter inside the top-level
1308 * din_root will turn into a recursive call to dt_cg_inline() for a scalar
1309 * inline whose din_root will refer to the subtree pointed to by the argument.
1310 */
1311 static void
1312 dt_cg_inline(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp)
1313 {
1314 dt_ident_t *idp = dnp->dn_ident;
1315 dt_idnode_t *inp = idp->di_iarg;
1316
1317 dt_idnode_t *pinp;
1318 dt_node_t *pnp;
1319 int i;
1320
1321 assert(idp->di_flags & DT_IDFLG_INLINE);
1322 assert(idp->di_ops == &dt_idops_inline);
1323
1324 if (idp->di_kind == DT_IDENT_ARRAY) {
1325 for (i = 0, pnp = dnp->dn_args;
1326 pnp != NULL; pnp = pnp->dn_list, i++) {
1327 if (inp->din_argv[i] != NULL) {
1328 pinp = inp->din_argv[i]->di_iarg;
1329 pinp->din_root = pnp;
1330 }
1331 }
1332 }
1333
1334 dt_cg_node(inp->din_root, dlp, drp);
1335 dnp->dn_reg = inp->din_root->dn_reg;
1336 dt_cg_typecast(inp->din_root, dnp, dlp, drp);
1337
1338 if (idp->di_kind == DT_IDENT_ARRAY) {
1339 for (i = 0; i < inp->din_argc; i++) {
1340 pinp = inp->din_argv[i]->di_iarg;
1341 pinp->din_root = NULL;
1342 }
1343 }
1344 }
1345
1346 typedef struct dt_xlmemb {
1347 dt_ident_t *dtxl_idp; /* translated ident */
1348 dt_irlist_t *dtxl_dlp; /* instruction list */
1349 dt_regset_t *dtxl_drp; /* register set */
1350 int dtxl_sreg; /* location of the translation input */
1351 int dtxl_dreg; /* location of our allocated buffer */
1352 } dt_xlmemb_t;
1353
1354 /*ARGSUSED*/
1355 static int
1356 dt_cg_xlate_member(const char *name, ctf_id_t type, ulong_t off, void *arg)
1357 {
1358 dt_xlmemb_t *dx = arg;
1359 dt_ident_t *idp = dx->dtxl_idp;
1360 dt_irlist_t *dlp = dx->dtxl_dlp;
1361 dt_regset_t *drp = dx->dtxl_drp;
1362
1363 dt_node_t *mnp;
1364 dt_xlator_t *dxp;
1365
1366 int reg, treg;
1367 uint32_t instr;
1368 size_t size;
1369
1370 /* Generate code for the translation. */
1371 dxp = idp->di_data;
1372 mnp = dt_xlator_member(dxp, name);
1373
1374 /* If there's no translator for the given member, skip it. */
1375 if (mnp == NULL)
1376 return (0);
1377
1378 dxp->dx_ident->di_flags |= DT_IDFLG_CGREG;
1379 dxp->dx_ident->di_id = dx->dtxl_sreg;
1380
1381 dt_cg_node(mnp->dn_membexpr, dlp, drp);
1382
1383 dxp->dx_ident->di_flags &= ~DT_IDFLG_CGREG;
1384 dxp->dx_ident->di_id = 0;
1385
1386 treg = mnp->dn_membexpr->dn_reg;
1387
1388 /* Compute the offset into our buffer and store the result there. */
1389 reg = dt_regset_alloc(drp);
1390
1391 dt_cg_setx(dlp, reg, off / NBBY);
1392 instr = DIF_INSTR_FMT(DIF_OP_ADD, dx->dtxl_dreg, reg, reg);
1393 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1394
1395 size = ctf_type_size(mnp->dn_membexpr->dn_ctfp,
1396 mnp->dn_membexpr->dn_type);
1397 if (dt_node_is_scalar(mnp->dn_membexpr)) {
1398 /*
1399 * Copying scalars is simple.
1400 */
1401 switch (size) {
1402 case 1:
1403 instr = DIF_INSTR_STORE(DIF_OP_STB, treg, reg);
1404 break;
1405 case 2:
1406 instr = DIF_INSTR_STORE(DIF_OP_STH, treg, reg);
1407 break;
1408 case 4:
1409 instr = DIF_INSTR_STORE(DIF_OP_STW, treg, reg);
1410 break;
1411 case 8:
1412 instr = DIF_INSTR_STORE(DIF_OP_STX, treg, reg);
1413 break;
1414 default:
1415 xyerror(D_UNKNOWN, "internal error -- unexpected "
1416 "size: %lu\n", (ulong_t)size);
1417 }
1418
1419 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1420
1421 } else if (dt_node_is_string(mnp->dn_membexpr)) {
1422 int szreg;
1423
1424 /*
1425 * Use the copys instruction for strings.
1426 */
1427 szreg = dt_regset_alloc(drp);
1428 dt_cg_setx(dlp, szreg, size);
1429 instr = DIF_INSTR_COPYS(treg, szreg, reg);
1430 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1431 dt_regset_free(drp, szreg);
1432 } else {
1433 int szreg;
1434
1435 /*
1436 * If it's anything else then we'll just bcopy it.
1437 */
1438 szreg = dt_regset_alloc(drp);
1439 dt_cg_setx(dlp, szreg, size);
1440 dt_irlist_append(dlp,
1441 dt_cg_node_alloc(DT_LBL_NONE, DIF_INSTR_FLUSHTS));
1442 instr = DIF_INSTR_PUSHTS(DIF_OP_PUSHTV, DIF_TYPE_CTF,
1443 DIF_REG_R0, treg);
1444 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1445 instr = DIF_INSTR_PUSHTS(DIF_OP_PUSHTV, DIF_TYPE_CTF,
1446 DIF_REG_R0, reg);
1447 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1448 instr = DIF_INSTR_PUSHTS(DIF_OP_PUSHTV, DIF_TYPE_CTF,
1449 DIF_REG_R0, szreg);
1450 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1451 instr = DIF_INSTR_CALL(DIF_SUBR_BCOPY, szreg);
1452 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1453 dt_regset_free(drp, szreg);
1454 }
1455
1456 dt_regset_free(drp, reg);
1457 dt_regset_free(drp, treg);
1458
1459 return (0);
1460 }
1461
1462 /*
1463 * If we're expanding a translated type, we create an appropriately sized
1464 * buffer with alloca() and then translate each member into it.
1465 */
1466 static int
1467 dt_cg_xlate_expand(dt_node_t *dnp, dt_ident_t *idp, dt_irlist_t *dlp,
1468 dt_regset_t *drp)
1469 {
1470 dt_xlmemb_t dlm;
1471 uint32_t instr;
1472 int dreg;
1473 size_t size;
1474
1475 dreg = dt_regset_alloc(drp);
1476 size = ctf_type_size(dnp->dn_ident->di_ctfp, dnp->dn_ident->di_type);
1477
1478 /* Call alloca() to create the buffer. */
1479 dt_cg_setx(dlp, dreg, size);
1480
1481 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, DIF_INSTR_FLUSHTS));
1482
1483 instr = DIF_INSTR_PUSHTS(DIF_OP_PUSHTV, DIF_TYPE_CTF, DIF_REG_R0, dreg);
1484 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1485
1486 instr = DIF_INSTR_CALL(DIF_SUBR_ALLOCA, dreg);
1487 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1488
1489 /* Generate the translation for each member. */
1490 dlm.dtxl_idp = idp;
1491 dlm.dtxl_dlp = dlp;
1492 dlm.dtxl_drp = drp;
1493 dlm.dtxl_sreg = dnp->dn_reg;
1494 dlm.dtxl_dreg = dreg;
1495 (void) ctf_member_iter(dnp->dn_ident->di_ctfp,
1496 dnp->dn_ident->di_type, dt_cg_xlate_member,
1497 &dlm);
1498
1499 return (dreg);
1500 }
1501
1502 static void
1503 dt_cg_node(dt_node_t *dnp, dt_irlist_t *dlp, dt_regset_t *drp)
1504 {
1505 ctf_file_t *ctfp = dnp->dn_ctfp;
1506 ctf_file_t *octfp;
1507 ctf_membinfo_t m;
1508 ctf_id_t type;
1509
1510 dif_instr_t instr;
1511 dt_ident_t *idp;
1512 ssize_t stroff;
1513 uint_t op;
1514
1515 switch (dnp->dn_op) {
1516 case DT_TOK_COMMA:
1517 dt_cg_node(dnp->dn_left, dlp, drp);
1518 dt_regset_free(drp, dnp->dn_left->dn_reg);
1519 dt_cg_node(dnp->dn_right, dlp, drp);
1520 dnp->dn_reg = dnp->dn_right->dn_reg;
1521 break;
1522
1523 case DT_TOK_ASGN:
1524 dt_cg_node(dnp->dn_right, dlp, drp);
1525 dnp->dn_reg = dnp->dn_right->dn_reg;
1526 dt_cg_asgn_op(dnp, dlp, drp);
1527 break;
1528
1529 case DT_TOK_ADD_EQ:
1530 dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_ADD);
1531 dt_cg_asgn_op(dnp, dlp, drp);
1532 break;
1533
1534 case DT_TOK_SUB_EQ:
1535 dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_SUB);
1536 dt_cg_asgn_op(dnp, dlp, drp);
1537 break;
1538
1539 case DT_TOK_MUL_EQ:
1540 dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_MUL);
1541 dt_cg_asgn_op(dnp, dlp, drp);
1542 break;
1543
1544 case DT_TOK_DIV_EQ:
1545 dt_cg_arithmetic_op(dnp, dlp, drp,
1546 (dnp->dn_flags & DT_NF_SIGNED) ? DIF_OP_SDIV : DIF_OP_UDIV);
1547 dt_cg_asgn_op(dnp, dlp, drp);
1548 break;
1549
1550 case DT_TOK_MOD_EQ:
1551 dt_cg_arithmetic_op(dnp, dlp, drp,
1552 (dnp->dn_flags & DT_NF_SIGNED) ? DIF_OP_SREM : DIF_OP_UREM);
1553 dt_cg_asgn_op(dnp, dlp, drp);
1554 break;
1555
1556 case DT_TOK_AND_EQ:
1557 dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_AND);
1558 dt_cg_asgn_op(dnp, dlp, drp);
1559 break;
1560
1561 case DT_TOK_XOR_EQ:
1562 dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_XOR);
1563 dt_cg_asgn_op(dnp, dlp, drp);
1564 break;
1565
1566 case DT_TOK_OR_EQ:
1567 dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_OR);
1568 dt_cg_asgn_op(dnp, dlp, drp);
1569 break;
1570
1571 case DT_TOK_LSH_EQ:
1572 dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_SLL);
1573 dt_cg_asgn_op(dnp, dlp, drp);
1574 break;
1575
1576 case DT_TOK_RSH_EQ:
1577 dt_cg_arithmetic_op(dnp, dlp, drp,
1578 (dnp->dn_flags & DT_NF_SIGNED) ? DIF_OP_SRA : DIF_OP_SRL);
1579 dt_cg_asgn_op(dnp, dlp, drp);
1580 break;
1581
1582 case DT_TOK_QUESTION:
1583 dt_cg_ternary_op(dnp, dlp, drp);
1584 break;
1585
1586 case DT_TOK_LOR:
1587 dt_cg_logical_or(dnp, dlp, drp);
1588 break;
1589
1590 case DT_TOK_LXOR:
1591 dt_cg_logical_xor(dnp, dlp, drp);
1592 break;
1593
1594 case DT_TOK_LAND:
1595 dt_cg_logical_and(dnp, dlp, drp);
1596 break;
1597
1598 case DT_TOK_BOR:
1599 dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_OR);
1600 break;
1601
1602 case DT_TOK_XOR:
1603 dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_XOR);
1604 break;
1605
1606 case DT_TOK_BAND:
1607 dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_AND);
1608 break;
1609
1610 case DT_TOK_EQU:
1611 dt_cg_compare_op(dnp, dlp, drp, DIF_OP_BE);
1612 break;
1613
1614 case DT_TOK_NEQ:
1615 dt_cg_compare_op(dnp, dlp, drp, DIF_OP_BNE);
1616 break;
1617
1618 case DT_TOK_LT:
1619 dt_cg_compare_op(dnp, dlp, drp,
1620 dt_cg_compare_signed(dnp) ? DIF_OP_BL : DIF_OP_BLU);
1621 break;
1622
1623 case DT_TOK_LE:
1624 dt_cg_compare_op(dnp, dlp, drp,
1625 dt_cg_compare_signed(dnp) ? DIF_OP_BLE : DIF_OP_BLEU);
1626 break;
1627
1628 case DT_TOK_GT:
1629 dt_cg_compare_op(dnp, dlp, drp,
1630 dt_cg_compare_signed(dnp) ? DIF_OP_BG : DIF_OP_BGU);
1631 break;
1632
1633 case DT_TOK_GE:
1634 dt_cg_compare_op(dnp, dlp, drp,
1635 dt_cg_compare_signed(dnp) ? DIF_OP_BGE : DIF_OP_BGEU);
1636 break;
1637
1638 case DT_TOK_LSH:
1639 dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_SLL);
1640 break;
1641
1642 case DT_TOK_RSH:
1643 dt_cg_arithmetic_op(dnp, dlp, drp,
1644 (dnp->dn_flags & DT_NF_SIGNED) ? DIF_OP_SRA : DIF_OP_SRL);
1645 break;
1646
1647 case DT_TOK_ADD:
1648 dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_ADD);
1649 break;
1650
1651 case DT_TOK_SUB:
1652 dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_SUB);
1653 break;
1654
1655 case DT_TOK_MUL:
1656 dt_cg_arithmetic_op(dnp, dlp, drp, DIF_OP_MUL);
1657 break;
1658
1659 case DT_TOK_DIV:
1660 dt_cg_arithmetic_op(dnp, dlp, drp,
1661 (dnp->dn_flags & DT_NF_SIGNED) ? DIF_OP_SDIV : DIF_OP_UDIV);
1662 break;
1663
1664 case DT_TOK_MOD:
1665 dt_cg_arithmetic_op(dnp, dlp, drp,
1666 (dnp->dn_flags & DT_NF_SIGNED) ? DIF_OP_SREM : DIF_OP_UREM);
1667 break;
1668
1669 case DT_TOK_LNEG:
1670 dt_cg_logical_neg(dnp, dlp, drp);
1671 break;
1672
1673 case DT_TOK_BNEG:
1674 dt_cg_node(dnp->dn_child, dlp, drp);
1675 dnp->dn_reg = dnp->dn_child->dn_reg;
1676 instr = DIF_INSTR_NOT(dnp->dn_reg, dnp->dn_reg);
1677 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1678 break;
1679
1680 case DT_TOK_PREINC:
1681 dt_cg_prearith_op(dnp, dlp, drp, DIF_OP_ADD);
1682 break;
1683
1684 case DT_TOK_POSTINC:
1685 dt_cg_postarith_op(dnp, dlp, drp, DIF_OP_ADD);
1686 break;
1687
1688 case DT_TOK_PREDEC:
1689 dt_cg_prearith_op(dnp, dlp, drp, DIF_OP_SUB);
1690 break;
1691
1692 case DT_TOK_POSTDEC:
1693 dt_cg_postarith_op(dnp, dlp, drp, DIF_OP_SUB);
1694 break;
1695
1696 case DT_TOK_IPOS:
1697 dt_cg_node(dnp->dn_child, dlp, drp);
1698 dnp->dn_reg = dnp->dn_child->dn_reg;
1699 break;
1700
1701 case DT_TOK_INEG:
1702 dt_cg_node(dnp->dn_child, dlp, drp);
1703 dnp->dn_reg = dnp->dn_child->dn_reg;
1704
1705 instr = DIF_INSTR_FMT(DIF_OP_SUB, DIF_REG_R0,
1706 dnp->dn_reg, dnp->dn_reg);
1707
1708 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1709 break;
1710
1711 case DT_TOK_DEREF:
1712 dt_cg_node(dnp->dn_child, dlp, drp);
1713 dnp->dn_reg = dnp->dn_child->dn_reg;
1714
1715 if (dt_node_is_dynamic(dnp->dn_child)) {
1716 int reg;
1717 idp = dt_node_resolve(dnp->dn_child, DT_IDENT_XLPTR);
1718 assert(idp != NULL);
1719 reg = dt_cg_xlate_expand(dnp, idp, dlp, drp);
1720
1721 dt_regset_free(drp, dnp->dn_child->dn_reg);
1722 dnp->dn_reg = reg;
1723
1724 } else if (!(dnp->dn_flags & DT_NF_REF)) {
1725 uint_t ubit = dnp->dn_flags & DT_NF_USERLAND;
1726
1727 /*
1728 * Save and restore DT_NF_USERLAND across dt_cg_load():
1729 * we need the sign bit from dnp and the user bit from
1730 * dnp->dn_child in order to get the proper opcode.
1731 */
1732 dnp->dn_flags |=
1733 (dnp->dn_child->dn_flags & DT_NF_USERLAND);
1734
1735 instr = DIF_INSTR_LOAD(dt_cg_load(dnp, ctfp,
1736 dnp->dn_type), dnp->dn_reg, dnp->dn_reg);
1737
1738 dnp->dn_flags &= ~DT_NF_USERLAND;
1739 dnp->dn_flags |= ubit;
1740
1741 dt_irlist_append(dlp,
1742 dt_cg_node_alloc(DT_LBL_NONE, instr));
1743 }
1744 break;
1745
1746 case DT_TOK_ADDROF: {
1747 uint_t rbit = dnp->dn_child->dn_flags & DT_NF_REF;
1748
1749 dnp->dn_child->dn_flags |= DT_NF_REF; /* force pass-by-ref */
1750 dt_cg_node(dnp->dn_child, dlp, drp);
1751 dnp->dn_reg = dnp->dn_child->dn_reg;
1752
1753 dnp->dn_child->dn_flags &= ~DT_NF_REF;
1754 dnp->dn_child->dn_flags |= rbit;
1755 break;
1756 }
1757
1758 case DT_TOK_SIZEOF: {
1759 size_t size = dt_node_sizeof(dnp->dn_child);
1760 dnp->dn_reg = dt_regset_alloc(drp);
1761 assert(size != 0);
1762 dt_cg_setx(dlp, dnp->dn_reg, size);
1763 break;
1764 }
1765
1766 case DT_TOK_STRINGOF:
1767 dt_cg_node(dnp->dn_child, dlp, drp);
1768 dnp->dn_reg = dnp->dn_child->dn_reg;
1769 break;
1770
1771 case DT_TOK_XLATE:
1772 /*
1773 * An xlate operator appears in either an XLATOR, indicating a
1774 * reference to a dynamic translator, or an OP2, indicating
1775 * use of the xlate operator in the user's program. For the
1776 * dynamic case, generate an xlate opcode with a reference to
1777 * the corresponding member, pre-computed for us in dn_members.
1778 */
1779 if (dnp->dn_kind == DT_NODE_XLATOR) {
1780 dt_xlator_t *dxp = dnp->dn_xlator;
1781
1782 assert(dxp->dx_ident->di_flags & DT_IDFLG_CGREG);
1783 assert(dxp->dx_ident->di_id != 0);
1784
1785 dnp->dn_reg = dt_regset_alloc(drp);
1786
1787 if (dxp->dx_arg == -1) {
1788 instr = DIF_INSTR_MOV(
1789 dxp->dx_ident->di_id, dnp->dn_reg);
1790 dt_irlist_append(dlp,
1791 dt_cg_node_alloc(DT_LBL_NONE, instr));
1792 op = DIF_OP_XLATE;
1793 } else
1794 op = DIF_OP_XLARG;
1795
1796 instr = DIF_INSTR_XLATE(op, 0, dnp->dn_reg);
1797 dt_irlist_append(dlp,
1798 dt_cg_node_alloc(DT_LBL_NONE, instr));
1799
1800 dlp->dl_last->di_extern = dnp->dn_xmember;
1801 break;
1802 }
1803
1804 assert(dnp->dn_kind == DT_NODE_OP2);
1805 dt_cg_node(dnp->dn_right, dlp, drp);
1806 dnp->dn_reg = dnp->dn_right->dn_reg;
1807 break;
1808
1809 case DT_TOK_LPAR:
1810 dt_cg_node(dnp->dn_right, dlp, drp);
1811 dnp->dn_reg = dnp->dn_right->dn_reg;
1812 dt_cg_typecast(dnp->dn_right, dnp, dlp, drp);
1813 break;
1814
1815 case DT_TOK_PTR:
1816 case DT_TOK_DOT:
1817 assert(dnp->dn_right->dn_kind == DT_NODE_IDENT);
1818 dt_cg_node(dnp->dn_left, dlp, drp);
1819
1820 /*
1821 * If the left-hand side of PTR or DOT is a dynamic variable,
1822 * we expect it to be the output of a D translator. In this
1823 * case, we look up the parse tree corresponding to the member
1824 * that is being accessed and run the code generator over it.
1825 * We then cast the result as if by the assignment operator.
1826 */
1827 if ((idp = dt_node_resolve(
1828 dnp->dn_left, DT_IDENT_XLSOU)) != NULL ||
1829 (idp = dt_node_resolve(
1830 dnp->dn_left, DT_IDENT_XLPTR)) != NULL) {
1831
1832 dt_xlator_t *dxp;
1833 dt_node_t *mnp;
1834
1835 dxp = idp->di_data;
1836 mnp = dt_xlator_member(dxp, dnp->dn_right->dn_string);
1837 assert(mnp != NULL);
1838
1839 dxp->dx_ident->di_flags |= DT_IDFLG_CGREG;
1840 dxp->dx_ident->di_id = dnp->dn_left->dn_reg;
1841
1842 dt_cg_node(mnp->dn_membexpr, dlp, drp);
1843 dnp->dn_reg = mnp->dn_membexpr->dn_reg;
1844 dt_cg_typecast(mnp->dn_membexpr, dnp, dlp, drp);
1845
1846 dxp->dx_ident->di_flags &= ~DT_IDFLG_CGREG;
1847 dxp->dx_ident->di_id = 0;
1848
1849 if (dnp->dn_left->dn_reg != -1)
1850 dt_regset_free(drp, dnp->dn_left->dn_reg);
1851 break;
1852 }
1853
1854 ctfp = dnp->dn_left->dn_ctfp;
1855 type = ctf_type_resolve(ctfp, dnp->dn_left->dn_type);
1856
1857 if (dnp->dn_op == DT_TOK_PTR) {
1858 type = ctf_type_reference(ctfp, type);
1859 type = ctf_type_resolve(ctfp, type);
1860 }
1861
1862 if ((ctfp = dt_cg_membinfo(octfp = ctfp, type,
1863 dnp->dn_right->dn_string, &m)) == NULL) {
1864 yypcb->pcb_hdl->dt_ctferr = ctf_errno(octfp);
1865 longjmp(yypcb->pcb_jmpbuf, EDT_CTF);
1866 }
1867
1868 if (m.ctm_offset != 0) {
1869 int reg;
1870
1871 reg = dt_regset_alloc(drp);
1872
1873 /*
1874 * If the offset is not aligned on a byte boundary, it
1875 * is a bit-field member and we will extract the value
1876 * bits below after we generate the appropriate load.
1877 */
1878 dt_cg_setx(dlp, reg, m.ctm_offset / NBBY);
1879
1880 instr = DIF_INSTR_FMT(DIF_OP_ADD,
1881 dnp->dn_left->dn_reg, reg, dnp->dn_left->dn_reg);
1882
1883 dt_irlist_append(dlp,
1884 dt_cg_node_alloc(DT_LBL_NONE, instr));
1885 dt_regset_free(drp, reg);
1886 }
1887
1888 if (!(dnp->dn_flags & DT_NF_REF)) {
1889 uint_t ubit = dnp->dn_flags & DT_NF_USERLAND;
1890
1891 /*
1892 * Save and restore DT_NF_USERLAND across dt_cg_load():
1893 * we need the sign bit from dnp and the user bit from
1894 * dnp->dn_left in order to get the proper opcode.
1895 */
1896 dnp->dn_flags |=
1897 (dnp->dn_left->dn_flags & DT_NF_USERLAND);
1898
1899 instr = DIF_INSTR_LOAD(dt_cg_load(dnp,
1900 ctfp, m.ctm_type), dnp->dn_left->dn_reg,
1901 dnp->dn_left->dn_reg);
1902
1903 dnp->dn_flags &= ~DT_NF_USERLAND;
1904 dnp->dn_flags |= ubit;
1905
1906 dt_irlist_append(dlp,
1907 dt_cg_node_alloc(DT_LBL_NONE, instr));
1908
1909 if (dnp->dn_flags & DT_NF_BITFIELD)
1910 dt_cg_field_get(dnp, dlp, drp, ctfp, &m);
1911 }
1912
1913 dnp->dn_reg = dnp->dn_left->dn_reg;
1914 break;
1915
1916 case DT_TOK_STRING:
1917 dnp->dn_reg = dt_regset_alloc(drp);
1918
1919 assert(dnp->dn_kind == DT_NODE_STRING);
1920 stroff = dt_strtab_insert(yypcb->pcb_strtab, dnp->dn_string);
1921
1922 if (stroff == -1L)
1923 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
1924 if (stroff > DIF_STROFF_MAX)
1925 longjmp(yypcb->pcb_jmpbuf, EDT_STR2BIG);
1926
1927 instr = DIF_INSTR_SETS((ulong_t)stroff, dnp->dn_reg);
1928 dt_irlist_append(dlp, dt_cg_node_alloc(DT_LBL_NONE, instr));
1929 break;
1930
1931 case DT_TOK_IDENT:
1932 /*
1933 * If the specified identifier is a variable on which we have
1934 * set the code generator register flag, then this variable
1935 * has already had code generated for it and saved in di_id.
1936 * Allocate a new register and copy the existing value to it.
1937 */
1938 if (dnp->dn_kind == DT_NODE_VAR &&
1939 (dnp->dn_ident->di_flags & DT_IDFLG_CGREG)) {
1940 dnp->dn_reg = dt_regset_alloc(drp);
1941 instr = DIF_INSTR_MOV(dnp->dn_ident->di_id,
1942 dnp->dn_reg);
1943 dt_irlist_append(dlp,
1944 dt_cg_node_alloc(DT_LBL_NONE, instr));
1945 break;
1946 }
1947
1948 /*
1949 * Identifiers can represent function calls, variable refs, or
1950 * symbols. First we check for inlined variables, and handle
1951 * them by generating code for the inline parse tree.
1952 */
1953 if (dnp->dn_kind == DT_NODE_VAR &&
1954 (dnp->dn_ident->di_flags & DT_IDFLG_INLINE)) {
1955 dt_cg_inline(dnp, dlp, drp);
1956 break;
1957 }
1958
1959 switch (dnp->dn_kind) {
1960 case DT_NODE_FUNC:
1961 if ((idp = dnp->dn_ident)->di_kind != DT_IDENT_FUNC) {
1962 dnerror(dnp, D_CG_EXPR, "%s %s( ) may not be "
1963 "called from a D expression (D program "
1964 "context required)\n",
1965 dt_idkind_name(idp->di_kind), idp->di_name);
1966 }
1967
1968 dt_cg_arglist(dnp->dn_ident, dnp->dn_args, dlp, drp);
1969
1970 dnp->dn_reg = dt_regset_alloc(drp);
1971 instr = DIF_INSTR_CALL(dnp->dn_ident->di_id,
1972 dnp->dn_reg);
1973
1974 dt_irlist_append(dlp,
1975 dt_cg_node_alloc(DT_LBL_NONE, instr));
1976
1977 break;
1978
1979 case DT_NODE_VAR:
1980 if (dnp->dn_ident->di_kind == DT_IDENT_XLSOU ||
1981 dnp->dn_ident->di_kind == DT_IDENT_XLPTR) {
1982 /*
1983 * This can only happen if we have translated
1984 * args[]. See dt_idcook_args() for details.
1985 */
1986 assert(dnp->dn_ident->di_id == DIF_VAR_ARGS);
1987 dt_cg_array_op(dnp, dlp, drp);
1988 break;
1989 }
1990
1991 if (dnp->dn_ident->di_kind == DT_IDENT_ARRAY) {
1992 if (dnp->dn_ident->di_id > DIF_VAR_ARRAY_MAX)
1993 dt_cg_assoc_op(dnp, dlp, drp);
1994 else
1995 dt_cg_array_op(dnp, dlp, drp);
1996 break;
1997 }
1998
1999 dnp->dn_reg = dt_regset_alloc(drp);
2000
2001 if (dnp->dn_ident->di_flags & DT_IDFLG_LOCAL)
2002 op = DIF_OP_LDLS;
2003 else if (dnp->dn_ident->di_flags & DT_IDFLG_TLS)
2004 op = DIF_OP_LDTS;
2005 else
2006 op = DIF_OP_LDGS;
2007
2008 dnp->dn_ident->di_flags |= DT_IDFLG_DIFR;
2009
2010 instr = DIF_INSTR_LDV(op,
2011 dnp->dn_ident->di_id, dnp->dn_reg);
2012
2013 dt_irlist_append(dlp,
2014 dt_cg_node_alloc(DT_LBL_NONE, instr));
2015 break;
2016
2017 case DT_NODE_SYM: {
2018 dtrace_hdl_t *dtp = yypcb->pcb_hdl;
2019 dtrace_syminfo_t *sip = dnp->dn_ident->di_data;
2020 GElf_Sym sym;
2021
2022 if (dtrace_lookup_by_name(dtp,
2023 sip->dts_object, sip->dts_name, &sym, NULL) == -1) {
2024 xyerror(D_UNKNOWN, "cg failed for symbol %s`%s:"
2025 " %s\n", sip->dts_object, sip->dts_name,
2026 dtrace_errmsg(dtp, dtrace_errno(dtp)));
2027 }
2028
2029 dnp->dn_reg = dt_regset_alloc(drp);
2030 dt_cg_xsetx(dlp, dnp->dn_ident,
2031 DT_LBL_NONE, dnp->dn_reg, sym.st_value);
2032
2033 if (!(dnp->dn_flags & DT_NF_REF)) {
2034 instr = DIF_INSTR_LOAD(dt_cg_load(dnp, ctfp,
2035 dnp->dn_type), dnp->dn_reg, dnp->dn_reg);
2036 dt_irlist_append(dlp,
2037 dt_cg_node_alloc(DT_LBL_NONE, instr));
2038 }
2039 break;
2040 }
2041
2042 default:
2043 xyerror(D_UNKNOWN, "internal error -- node type %u is "
2044 "not valid for an identifier\n", dnp->dn_kind);
2045 }
2046 break;
2047
2048 case DT_TOK_INT:
2049 dnp->dn_reg = dt_regset_alloc(drp);
2050 dt_cg_setx(dlp, dnp->dn_reg, dnp->dn_value);
2051 break;
2052
2053 default:
2054 xyerror(D_UNKNOWN, "internal error -- token type %u is not a "
2055 "valid D compilation token\n", dnp->dn_op);
2056 }
2057 }
2058
2059 void
2060 dt_cg(dt_pcb_t *pcb, dt_node_t *dnp)
2061 {
2062 dif_instr_t instr;
2063 dt_xlator_t *dxp;
2064 dt_ident_t *idp;
2065
2066 if (pcb->pcb_regs == NULL && (pcb->pcb_regs =
2067 dt_regset_create(pcb->pcb_hdl->dt_conf.dtc_difintregs)) == NULL)
2068 longjmp(pcb->pcb_jmpbuf, EDT_NOMEM);
2069
2070 dt_regset_reset(pcb->pcb_regs);
2071 (void) dt_regset_alloc(pcb->pcb_regs); /* allocate %r0 */
2072
2073 if (pcb->pcb_inttab != NULL)
2074 dt_inttab_destroy(pcb->pcb_inttab);
2075
2076 if ((pcb->pcb_inttab = dt_inttab_create(yypcb->pcb_hdl)) == NULL)
2077 longjmp(pcb->pcb_jmpbuf, EDT_NOMEM);
2078
2079 if (pcb->pcb_strtab != NULL)
2080 dt_strtab_destroy(pcb->pcb_strtab);
2081
2082 if ((pcb->pcb_strtab = dt_strtab_create(BUFSIZ)) == NULL)
2083 longjmp(pcb->pcb_jmpbuf, EDT_NOMEM);
2084
2085 dt_irlist_destroy(&pcb->pcb_ir);
2086 dt_irlist_create(&pcb->pcb_ir);
2087
2088 assert(pcb->pcb_dret == NULL);
2089 pcb->pcb_dret = dnp;
2090
2091 if (dt_node_resolve(dnp, DT_IDENT_XLPTR) != NULL) {
2092 dnerror(dnp, D_CG_DYN, "expression cannot evaluate to result "
2093 "of a translated pointer\n");
2094 }
2095
2096 /*
2097 * If we're generating code for a translator body, assign the input
2098 * parameter to the first available register (i.e. caller passes %r1).
2099 */
2100 if (dnp->dn_kind == DT_NODE_MEMBER) {
2101 dxp = dnp->dn_membxlator;
2102 dnp = dnp->dn_membexpr;
2103
2104 dxp->dx_ident->di_flags |= DT_IDFLG_CGREG;
2105 dxp->dx_ident->di_id = dt_regset_alloc(pcb->pcb_regs);
2106 }
2107
2108 dt_cg_node(dnp, &pcb->pcb_ir, pcb->pcb_regs);
2109
2110 if ((idp = dt_node_resolve(dnp, DT_IDENT_XLSOU)) != NULL) {
2111 int reg = dt_cg_xlate_expand(dnp, idp,
2112 &pcb->pcb_ir, pcb->pcb_regs);
2113 dt_regset_free(pcb->pcb_regs, dnp->dn_reg);
2114 dnp->dn_reg = reg;
2115 }
2116
2117 instr = DIF_INSTR_RET(dnp->dn_reg);
2118 dt_regset_free(pcb->pcb_regs, dnp->dn_reg);
2119 dt_irlist_append(&pcb->pcb_ir, dt_cg_node_alloc(DT_LBL_NONE, instr));
2120
2121 if (dnp->dn_kind == DT_NODE_MEMBER) {
2122 dt_regset_free(pcb->pcb_regs, dxp->dx_ident->di_id);
2123 dxp->dx_ident->di_id = 0;
2124 dxp->dx_ident->di_flags &= ~DT_IDFLG_CGREG;
2125 }
2126
2127 dt_regset_free(pcb->pcb_regs, 0);
2128 dt_regset_assert_free(pcb->pcb_regs);
2129 }
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