include/demangle.h

   1 /* Defs for interface to demanglers.
   2    Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002,
   3    2003, 2004, 2005, 2007 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License
   7    as published by the Free Software Foundation; either version 2, or
   8    (at your option) any later version.
   9
  10    In addition to the permissions in the GNU Library General Public
  11    License, the Free Software Foundation gives you unlimited
  12    permission to link the compiled version of this file into
  13    combinations with other programs, and to distribute those
  14    combinations without any restriction coming from the use of this
  15    file.  (The Library Public License restrictions do apply in other
  16    respects; for example, they cover modification of the file, and
  17    distribution when not linked into a combined executable.)
  18
  19    This program is distributed in the hope that it will be useful, but
  20    WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  22    Library General Public License for more details.
  23
  24    You should have received a copy of the GNU Library General Public
  25    License along with this program; if not, write to the Free Software
  26    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  27    02110-1301, USA.  */
  28
  29
  30 #if !defined (DEMANGLE_H)
  31 #define DEMANGLE_H
  32
  33 #include "libiberty.h"
  34
  35 #ifdef __cplusplus
  36 extern "C" {
  37 #endif /* __cplusplus */
  38
  39 /* Options passed to cplus_demangle (in 2nd parameter). */
  40
  41 #define DMGL_NO_OPTS     0              /* For readability... */
  42 #define DMGL_PARAMS      (1 << 0)       /* Include function args */
  43 #define DMGL_ANSI        (1 << 1)       /* Include const, volatile, etc */
  44 #define DMGL_JAVA        (1 << 2)       /* Demangle as Java rather than C++. */
  45 #define DMGL_VERBOSE     (1 << 3)       /* Include implementation details.  */
  46 #define DMGL_TYPES       (1 << 4)       /* Also try to demangle type encodings.  */
  47 #define DMGL_RET_POSTFIX (1 << 5)       /* Print function return types (when
  48                                            present) after function signature */
  49
  50 #define DMGL_AUTO        (1 << 8)
  51 #define DMGL_GNU         (1 << 9)
  52 #define DMGL_LUCID       (1 << 10)
  53 #define DMGL_ARM         (1 << 11)
  54 #define DMGL_HP          (1 << 12)       /* For the HP aCC compiler;
  55                                             same as ARM except for
  56                                             template arguments, etc. */
  57 #define DMGL_EDG         (1 << 13)
  58 #define DMGL_GNU_V3      (1 << 14)
  59 #define DMGL_GNAT        (1 << 15)
  60
  61 /* If none of these are set, use 'current_demangling_style' as the default. */
  62 #define DMGL_STYLE_MASK (DMGL_AUTO|DMGL_GNU|DMGL_LUCID|DMGL_ARM|DMGL_HP|DMGL_EDG|DMGL_GNU_V3|DMGL_JAVA|DMGL_GNAT)
  63
  64 /* Enumeration of possible demangling styles.
  65
  66    Lucid and ARM styles are still kept logically distinct, even though
  67    they now both behave identically.  The resulting style is actual the
  68    union of both.  I.E. either style recognizes both "__pt__" and "__rf__"
  69    for operator "->", even though the first is lucid style and the second
  70    is ARM style. (FIXME?) */
  71
  72 extern enum demangling_styles
  73 {
  74   no_demangling = -1,
  75   unknown_demangling = 0,
  76   auto_demangling = DMGL_AUTO,
  77   gnu_demangling = DMGL_GNU,
  78   lucid_demangling = DMGL_LUCID,
  79   arm_demangling = DMGL_ARM,
  80   hp_demangling = DMGL_HP,
  81   edg_demangling = DMGL_EDG,
  82   gnu_v3_demangling = DMGL_GNU_V3,
  83   java_demangling = DMGL_JAVA,
  84   gnat_demangling = DMGL_GNAT
  85 } current_demangling_style;
  86
  87 /* Define string names for the various demangling styles. */
  88
  89 #define NO_DEMANGLING_STYLE_STRING            "none"
  90 #define AUTO_DEMANGLING_STYLE_STRING          "auto"
  91 #define GNU_DEMANGLING_STYLE_STRING           "gnu"
  92 #define LUCID_DEMANGLING_STYLE_STRING         "lucid"
  93 #define ARM_DEMANGLING_STYLE_STRING           "arm"
  94 #define HP_DEMANGLING_STYLE_STRING            "hp"
  95 #define EDG_DEMANGLING_STYLE_STRING           "edg"
  96 #define GNU_V3_DEMANGLING_STYLE_STRING        "gnu-v3"
  97 #define JAVA_DEMANGLING_STYLE_STRING          "java"
  98 #define GNAT_DEMANGLING_STYLE_STRING          "gnat"
  99
 100 /* Some macros to test what demangling style is active. */
 101
 102 #define CURRENT_DEMANGLING_STYLE current_demangling_style
 103 #define AUTO_DEMANGLING (((int) CURRENT_DEMANGLING_STYLE) & DMGL_AUTO)
 104 #define GNU_DEMANGLING (((int) CURRENT_DEMANGLING_STYLE) & DMGL_GNU)
 105 #define LUCID_DEMANGLING (((int) CURRENT_DEMANGLING_STYLE) & DMGL_LUCID)
 106 #define ARM_DEMANGLING (((int) CURRENT_DEMANGLING_STYLE) & DMGL_ARM)
 107 #define HP_DEMANGLING (((int) CURRENT_DEMANGLING_STYLE) & DMGL_HP)
 108 #define EDG_DEMANGLING (((int) CURRENT_DEMANGLING_STYLE) & DMGL_EDG)
 109 #define GNU_V3_DEMANGLING (((int) CURRENT_DEMANGLING_STYLE) & DMGL_GNU_V3)
 110 #define JAVA_DEMANGLING (((int) CURRENT_DEMANGLING_STYLE) & DMGL_JAVA)
 111 #define GNAT_DEMANGLING (((int) CURRENT_DEMANGLING_STYLE) & DMGL_GNAT)
 112
 113 /* Provide information about the available demangle styles. This code is
 114    pulled from gdb into libiberty because it is useful to binutils also.  */
 115
 116 extern const struct demangler_engine
 117 {
 118   const char *const demangling_style_name;
 119   const enum demangling_styles demangling_style;
 120   const char *const demangling_style_doc;
 121 } libiberty_demanglers[];
 122
 123 extern char *
 124 cplus_demangle (const char *mangled, int options);
 125
 126 extern int
 127 cplus_demangle_opname (const char *opname, char *result, int options);
 128
 129 extern const char *
 130 cplus_mangle_opname (const char *opname, int options);
 131
 132 /* Note: This sets global state.  FIXME if you care about multi-threading. */
 133
 134 extern void
 135 set_cplus_marker_for_demangling (int ch);
 136
 137 extern enum demangling_styles
 138 cplus_demangle_set_style (enum demangling_styles style);
 139
 140 extern enum demangling_styles
 141 cplus_demangle_name_to_style (const char *name);
 142
 143 /* Callback typedef for allocation-less demangler interfaces. */
 144 typedef void (*demangle_callbackref) (const char *, size_t, void *);
 145
 146 /* V3 ABI demangling entry points, defined in cp-demangle.c.  Callback
 147    variants return non-zero on success, zero on error.  char* variants
 148    return a string allocated by malloc on success, NULL on error.  */
 149 extern int
 150 cplus_demangle_v3_callback (const char *mangled, int options,
 151                             demangle_callbackref callback, void *opaque);
 152
 153 extern char*
 154 cplus_demangle_v3 (const char *mangled, int options);
 155
 156 extern int
 157 java_demangle_v3_callback (const char *mangled,
 158                            demangle_callbackref callback, void *opaque);
 159
 160 extern char*
 161 java_demangle_v3 (const char *mangled);
 162
 163 enum gnu_v3_ctor_kinds {
 164   gnu_v3_complete_object_ctor = 1,
 165   gnu_v3_base_object_ctor,
 166   gnu_v3_complete_object_allocating_ctor
 167 };
 168
 169 /* Return non-zero iff NAME is the mangled form of a constructor name
 170    in the G++ V3 ABI demangling style.  Specifically, return an `enum
 171    gnu_v3_ctor_kinds' value indicating what kind of constructor
 172    it is.  */
 173 extern enum gnu_v3_ctor_kinds
 174         is_gnu_v3_mangled_ctor (const char *name);
 175
 176
 177 enum gnu_v3_dtor_kinds {
 178   gnu_v3_deleting_dtor = 1,
 179   gnu_v3_complete_object_dtor,
 180   gnu_v3_base_object_dtor
 181 };
 182
 183 /* Return non-zero iff NAME is the mangled form of a destructor name
 184    in the G++ V3 ABI demangling style.  Specifically, return an `enum
 185    gnu_v3_dtor_kinds' value, indicating what kind of destructor
 186    it is.  */
 187 extern enum gnu_v3_dtor_kinds
 188         is_gnu_v3_mangled_dtor (const char *name);
 189
 190 /* The V3 demangler works in two passes.  The first pass builds a tree
 191    representation of the mangled name, and the second pass turns the
 192    tree representation into a demangled string.  Here we define an
 193    interface to permit a caller to build their own tree
 194    representation, which they can pass to the demangler to get a
 195    demangled string.  This can be used to canonicalize user input into
 196    something which the demangler might output.  It could also be used
 197    by other demanglers in the future.  */
 198
 199 /* These are the component types which may be found in the tree.  Many
 200    component types have one or two subtrees, referred to as left and
 201    right (a component type with only one subtree puts it in the left
 202    subtree).  */
 203
 204 enum demangle_component_type
 205 {
 206   /* A name, with a length and a pointer to a string.  */
 207   DEMANGLE_COMPONENT_NAME,
 208   /* A qualified name.  The left subtree is a class or namespace or
 209      some such thing, and the right subtree is a name qualified by
 210      that class.  */
 211   DEMANGLE_COMPONENT_QUAL_NAME,
 212   /* A local name.  The left subtree describes a function, and the
 213      right subtree is a name which is local to that function.  */
 214   DEMANGLE_COMPONENT_LOCAL_NAME,
 215   /* A typed name.  The left subtree is a name, and the right subtree
 216      describes that name as a function.  */
 217   DEMANGLE_COMPONENT_TYPED_NAME,
 218   /* A template.  The left subtree is a template name, and the right
 219      subtree is a template argument list.  */
 220   DEMANGLE_COMPONENT_TEMPLATE,
 221   /* A template parameter.  This holds a number, which is the template
 222      parameter index.  */
 223   DEMANGLE_COMPONENT_TEMPLATE_PARAM,
 224   /* A constructor.  This holds a name and the kind of
 225      constructor.  */
 226   DEMANGLE_COMPONENT_CTOR,
 227   /* A destructor.  This holds a name and the kind of destructor.  */
 228   DEMANGLE_COMPONENT_DTOR,
 229   /* A vtable.  This has one subtree, the type for which this is a
 230      vtable.  */
 231   DEMANGLE_COMPONENT_VTABLE,
 232   /* A VTT structure.  This has one subtree, the type for which this
 233      is a VTT.  */
 234   DEMANGLE_COMPONENT_VTT,
 235   /* A construction vtable.  The left subtree is the type for which
 236      this is a vtable, and the right subtree is the derived type for
 237      which this vtable is built.  */
 238   DEMANGLE_COMPONENT_CONSTRUCTION_VTABLE,
 239   /* A typeinfo structure.  This has one subtree, the type for which
 240      this is the tpeinfo structure.  */
 241   DEMANGLE_COMPONENT_TYPEINFO,
 242   /* A typeinfo name.  This has one subtree, the type for which this
 243      is the typeinfo name.  */
 244   DEMANGLE_COMPONENT_TYPEINFO_NAME,
 245   /* A typeinfo function.  This has one subtree, the type for which
 246      this is the tpyeinfo function.  */
 247   DEMANGLE_COMPONENT_TYPEINFO_FN,
 248   /* A thunk.  This has one subtree, the name for which this is a
 249      thunk.  */
 250   DEMANGLE_COMPONENT_THUNK,
 251   /* A virtual thunk.  This has one subtree, the name for which this
 252      is a virtual thunk.  */
 253   DEMANGLE_COMPONENT_VIRTUAL_THUNK,
 254   /* A covariant thunk.  This has one subtree, the name for which this
 255      is a covariant thunk.  */
 256   DEMANGLE_COMPONENT_COVARIANT_THUNK,
 257   /* A Java class.  This has one subtree, the type.  */
 258   DEMANGLE_COMPONENT_JAVA_CLASS,
 259   /* A guard variable.  This has one subtree, the name for which this
 260      is a guard variable.  */
 261   DEMANGLE_COMPONENT_GUARD,
 262   /* A reference temporary.  This has one subtree, the name for which
 263      this is a temporary.  */
 264   DEMANGLE_COMPONENT_REFTEMP,
 265   /* A hidden alias.  This has one subtree, the encoding for which it
 266      is providing alternative linkage.  */
 267   DEMANGLE_COMPONENT_HIDDEN_ALIAS,
 268   /* A standard substitution.  This holds the name of the
 269      substitution.  */
 270   DEMANGLE_COMPONENT_SUB_STD,
 271   /* The restrict qualifier.  The one subtree is the type which is
 272      being qualified.  */
 273   DEMANGLE_COMPONENT_RESTRICT,
 274   /* The volatile qualifier.  The one subtree is the type which is
 275      being qualified.  */
 276   DEMANGLE_COMPONENT_VOLATILE,
 277   /* The const qualifier.  The one subtree is the type which is being
 278      qualified.  */
 279   DEMANGLE_COMPONENT_CONST,
 280   /* The restrict qualifier modifying a member function.  The one
 281      subtree is the type which is being qualified.  */
 282   DEMANGLE_COMPONENT_RESTRICT_THIS,
 283   /* The volatile qualifier modifying a member function.  The one
 284      subtree is the type which is being qualified.  */
 285   DEMANGLE_COMPONENT_VOLATILE_THIS,
 286   /* The const qualifier modifying a member function.  The one subtree
 287      is the type which is being qualified.  */
 288   DEMANGLE_COMPONENT_CONST_THIS,
 289   /* A vendor qualifier.  The left subtree is the type which is being
 290      qualified, and the right subtree is the name of the
 291      qualifier.  */
 292   DEMANGLE_COMPONENT_VENDOR_TYPE_QUAL,
 293   /* A pointer.  The one subtree is the type which is being pointed
 294      to.  */
 295   DEMANGLE_COMPONENT_POINTER,
 296   /* A reference.  The one subtree is the type which is being
 297      referenced.  */
 298   DEMANGLE_COMPONENT_REFERENCE,
 299   /* A complex type.  The one subtree is the base type.  */
 300   DEMANGLE_COMPONENT_COMPLEX,
 301   /* An imaginary type.  The one subtree is the base type.  */
 302   DEMANGLE_COMPONENT_IMAGINARY,
 303   /* A builtin type.  This holds the builtin type information.  */
 304   DEMANGLE_COMPONENT_BUILTIN_TYPE,
 305   /* A vendor's builtin type.  This holds the name of the type.  */
 306   DEMANGLE_COMPONENT_VENDOR_TYPE,
 307   /* A function type.  The left subtree is the return type.  The right
 308      subtree is a list of ARGLIST nodes.  Either or both may be
 309      NULL.  */
 310   DEMANGLE_COMPONENT_FUNCTION_TYPE,
 311   /* An array type.  The left subtree is the dimension, which may be
 312      NULL, or a string (represented as DEMANGLE_COMPONENT_NAME), or an
 313      expression.  The right subtree is the element type.  */
 314   DEMANGLE_COMPONENT_ARRAY_TYPE,
 315   /* A pointer to member type.  The left subtree is the class type,
 316      and the right subtree is the member type.  CV-qualifiers appear
 317      on the latter.  */
 318   DEMANGLE_COMPONENT_PTRMEM_TYPE,
 319   /* An argument list.  The left subtree is the current argument, and
 320      the right subtree is either NULL or another ARGLIST node.  */
 321   DEMANGLE_COMPONENT_ARGLIST,
 322   /* A template argument list.  The left subtree is the current
 323      template argument, and the right subtree is either NULL or
 324      another TEMPLATE_ARGLIST node.  */
 325   DEMANGLE_COMPONENT_TEMPLATE_ARGLIST,
 326   /* An operator.  This holds information about a standard
 327      operator.  */
 328   DEMANGLE_COMPONENT_OPERATOR,
 329   /* An extended operator.  This holds the number of arguments, and
 330      the name of the extended operator.  */
 331   DEMANGLE_COMPONENT_EXTENDED_OPERATOR,
 332   /* A typecast, represented as a unary operator.  The one subtree is
 333      the type to which the argument should be cast.  */
 334   DEMANGLE_COMPONENT_CAST,
 335   /* A unary expression.  The left subtree is the operator, and the
 336      right subtree is the single argument.  */
 337   DEMANGLE_COMPONENT_UNARY,
 338   /* A binary expression.  The left subtree is the operator, and the
 339      right subtree is a BINARY_ARGS.  */
 340   DEMANGLE_COMPONENT_BINARY,
 341   /* Arguments to a binary expression.  The left subtree is the first
 342      argument, and the right subtree is the second argument.  */
 343   DEMANGLE_COMPONENT_BINARY_ARGS,
 344   /* A trinary expression.  The left subtree is the operator, and the
 345      right subtree is a TRINARY_ARG1.  */
 346   DEMANGLE_COMPONENT_TRINARY,
 347   /* Arguments to a trinary expression.  The left subtree is the first
 348      argument, and the right subtree is a TRINARY_ARG2.  */
 349   DEMANGLE_COMPONENT_TRINARY_ARG1,
 350   /* More arguments to a trinary expression.  The left subtree is the
 351      second argument, and the right subtree is the third argument.  */
 352   DEMANGLE_COMPONENT_TRINARY_ARG2,
 353   /* A literal.  The left subtree is the type, and the right subtree
 354      is the value, represented as a DEMANGLE_COMPONENT_NAME.  */
 355   DEMANGLE_COMPONENT_LITERAL,
 356   /* A negative literal.  Like LITERAL, but the value is negated.
 357      This is a minor hack: the NAME used for LITERAL points directly
 358      to the mangled string, but since negative numbers are mangled
 359      using 'n' instead of '-', we want a way to indicate a negative
 360      number which involves neither modifying the mangled string nor
 361      allocating a new copy of the literal in memory.  */
 362   DEMANGLE_COMPONENT_LITERAL_NEG
 363 };
 364
 365 /* Types which are only used internally.  */
 366
 367 struct demangle_operator_info;
 368 struct demangle_builtin_type_info;
 369
 370 /* A node in the tree representation is an instance of a struct
 371    demangle_component.  Note that the field names of the struct are
 372    not well protected against macros defined by the file including
 373    this one.  We can fix this if it ever becomes a problem.  */
 374
 375 struct demangle_component
 376 {
 377   /* The type of this component.  */
 378   enum demangle_component_type type;
 379
 380   union
 381   {
 382     /* For DEMANGLE_COMPONENT_NAME.  */
 383     struct
 384     {
 385       /* A pointer to the name (which need not NULL terminated) and
 386          its length.  */
 387       const char *s;
 388       int len;
 389     } s_name;
 390
 391     /* For DEMANGLE_COMPONENT_OPERATOR.  */
 392     struct
 393     {
 394       /* Operator.  */
 395       const struct demangle_operator_info *op;
 396     } s_operator;
 397
 398     /* For DEMANGLE_COMPONENT_EXTENDED_OPERATOR.  */
 399     struct
 400     {
 401       /* Number of arguments.  */
 402       int args;
 403       /* Name.  */
 404       struct demangle_component *name;
 405     } s_extended_operator;
 406
 407     /* For DEMANGLE_COMPONENT_CTOR.  */
 408     struct
 409     {
 410       /* Kind of constructor.  */
 411       enum gnu_v3_ctor_kinds kind;
 412       /* Name.  */
 413       struct demangle_component *name;
 414     } s_ctor;
 415
 416     /* For DEMANGLE_COMPONENT_DTOR.  */
 417     struct
 418     {
 419       /* Kind of destructor.  */
 420       enum gnu_v3_dtor_kinds kind;
 421       /* Name.  */
 422       struct demangle_component *name;
 423     } s_dtor;
 424
 425     /* For DEMANGLE_COMPONENT_BUILTIN_TYPE.  */
 426     struct
 427     {
 428       /* Builtin type.  */
 429       const struct demangle_builtin_type_info *type;
 430     } s_builtin;
 431
 432     /* For DEMANGLE_COMPONENT_SUB_STD.  */
 433     struct
 434     {
 435       /* Standard substitution string.  */
 436       const char* string;
 437       /* Length of string.  */
 438       int len;
 439     } s_string;
 440
 441     /* For DEMANGLE_COMPONENT_TEMPLATE_PARAM.  */
 442     struct
 443     {
 444       /* Template parameter index.  */
 445       long number;
 446     } s_number;
 447
 448     /* For other types.  */
 449     struct
 450     {
 451       /* Left (or only) subtree.  */
 452       struct demangle_component *left;
 453       /* Right subtree.  */
 454       struct demangle_component *right;
 455     } s_binary;
 456
 457   } u;
 458 };
 459
 460 /* People building mangled trees are expected to allocate instances of
 461    struct demangle_component themselves.  They can then call one of
 462    the following functions to fill them in.  */
 463
 464 /* Fill in most component types with a left subtree and a right
 465    subtree.  Returns non-zero on success, zero on failure, such as an
 466    unrecognized or inappropriate component type.  */
 467
 468 extern int
 469 cplus_demangle_fill_component (struct demangle_component *fill,
 470                                enum demangle_component_type,
 471                                struct demangle_component *left,
 472                                struct demangle_component *right);
 473
 474 /* Fill in a DEMANGLE_COMPONENT_NAME.  Returns non-zero on success,
 475    zero for bad arguments.  */
 476
 477 extern int
 478 cplus_demangle_fill_name (struct demangle_component *fill,
 479                           const char *, int);
 480
 481 /* Fill in a DEMANGLE_COMPONENT_BUILTIN_TYPE, using the name of the
 482    builtin type (e.g., "int", etc.).  Returns non-zero on success,
 483    zero if the type is not recognized.  */
 484
 485 extern int
 486 cplus_demangle_fill_builtin_type (struct demangle_component *fill,
 487                                   const char *type_name);
 488
 489 /* Fill in a DEMANGLE_COMPONENT_OPERATOR, using the name of the
 490    operator and the number of arguments which it takes (the latter is
 491    used to disambiguate operators which can be both binary and unary,
 492    such as '-').  Returns non-zero on success, zero if the operator is
 493    not recognized.  */
 494
 495 extern int
 496 cplus_demangle_fill_operator (struct demangle_component *fill,
 497                               const char *opname, int args);
 498
 499 /* Fill in a DEMANGLE_COMPONENT_EXTENDED_OPERATOR, providing the
 500    number of arguments and the name.  Returns non-zero on success,
 501    zero for bad arguments.  */
 502
 503 extern int
 504 cplus_demangle_fill_extended_operator (struct demangle_component *fill,
 505                                        int numargs,
 506                                        struct demangle_component *nm);
 507
 508 /* Fill in a DEMANGLE_COMPONENT_CTOR.  Returns non-zero on success,
 509    zero for bad arguments.  */
 510
 511 extern int
 512 cplus_demangle_fill_ctor (struct demangle_component *fill,
 513                           enum gnu_v3_ctor_kinds kind,
 514                           struct demangle_component *name);
 515
 516 /* Fill in a DEMANGLE_COMPONENT_DTOR.  Returns non-zero on success,
 517    zero for bad arguments.  */
 518
 519 extern int
 520 cplus_demangle_fill_dtor (struct demangle_component *fill,
 521                           enum gnu_v3_dtor_kinds kind,
 522                           struct demangle_component *name);
 523
 524 /* This function translates a mangled name into a struct
 525    demangle_component tree.  The first argument is the mangled name.
 526    The second argument is DMGL_* options.  This returns a pointer to a
 527    tree on success, or NULL on failure.  On success, the third
 528    argument is set to a block of memory allocated by malloc.  This
 529    block should be passed to free when the tree is no longer
 530    needed.  */
 531
 532 extern struct demangle_component *
 533 cplus_demangle_v3_components (const char *mangled, int options, void **mem);
 534
 535 /* This function takes a struct demangle_component tree and returns
 536    the corresponding demangled string.  The first argument is DMGL_*
 537    options.  The second is the tree to demangle.  The third is a guess
 538    at the length of the demangled string, used to initially allocate
 539    the return buffer.  The fourth is a pointer to a size_t.  On
 540    success, this function returns a buffer allocated by malloc(), and
 541    sets the size_t pointed to by the fourth argument to the size of
 542    the allocated buffer (not the length of the returned string).  On
 543    failure, this function returns NULL, and sets the size_t pointed to
 544    by the fourth argument to 0 for an invalid tree, or to 1 for a
 545    memory allocation error.  */
 546
 547 extern char *
 548 cplus_demangle_print (int options,
 549                       const struct demangle_component *tree,
 550                       int estimated_length,
 551                       size_t *p_allocated_size);
 552
 553 /* This function takes a struct demangle_component tree and passes back
 554    a demangled string in one or more calls to a callback function.
 555    The first argument is DMGL_* options.  The second is the tree to
 556    demangle.  The third is a pointer to a callback function; on each call
 557    this receives an element of the demangled string, its length, and an
 558    opaque value.  The fourth is the opaque value passed to the callback.
 559    The callback is called once or more to return the full demangled
 560    string.  The demangled element string is always nul-terminated, though
 561    its length is also provided for convenience.  In contrast to
 562    cplus_demangle_print(), this function does not allocate heap memory
 563    to grow output strings (except perhaps where alloca() is implemented
 564    by malloc()), and so is normally safe for use where the heap has been
 565    corrupted.  On success, this function returns 1; on failure, 0.  */
 566
 567 extern int
 568 cplus_demangle_print_callback (int options,
 569                                const struct demangle_component *tree,
 570                                demangle_callbackref callback, void *opaque);
 571
 572 #ifdef __cplusplus
 573 }
 574 #endif /* __cplusplus */
 575
 576 #endif  /* DEMANGLE_H */