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   /* C++0x: An rvalue reference.  The one subtree is the type which is
 300      being referenced.  */
 301   DEMANGLE_COMPONENT_RVALUE_REFERENCE,
 302   /* A complex type.  The one subtree is the base type.  */
 303   DEMANGLE_COMPONENT_COMPLEX,
 304   /* An imaginary type.  The one subtree is the base type.  */
 305   DEMANGLE_COMPONENT_IMAGINARY,
 306   /* A builtin type.  This holds the builtin type information.  */
 307   DEMANGLE_COMPONENT_BUILTIN_TYPE,
 308   /* A vendor's builtin type.  This holds the name of the type.  */
 309   DEMANGLE_COMPONENT_VENDOR_TYPE,
 310   /* A function type.  The left subtree is the return type.  The right
 311      subtree is a list of ARGLIST nodes.  Either or both may be
 312      NULL.  */
 313   DEMANGLE_COMPONENT_FUNCTION_TYPE,
 314   /* An array type.  The left subtree is the dimension, which may be
 315      NULL, or a string (represented as DEMANGLE_COMPONENT_NAME), or an
 316      expression.  The right subtree is the element type.  */
 317   DEMANGLE_COMPONENT_ARRAY_TYPE,
 318   /* A pointer to member type.  The left subtree is the class type,
 319      and the right subtree is the member type.  CV-qualifiers appear
 320      on the latter.  */
 321   DEMANGLE_COMPONENT_PTRMEM_TYPE,
 322   /* An argument list.  The left subtree is the current argument, and
 323      the right subtree is either NULL or another ARGLIST node.  */
 324   DEMANGLE_COMPONENT_ARGLIST,
 325   /* A template argument list.  The left subtree is the current
 326      template argument, and the right subtree is either NULL or
 327      another TEMPLATE_ARGLIST node.  */
 328   DEMANGLE_COMPONENT_TEMPLATE_ARGLIST,
 329   /* An operator.  This holds information about a standard
 330      operator.  */
 331   DEMANGLE_COMPONENT_OPERATOR,
 332   /* An extended operator.  This holds the number of arguments, and
 333      the name of the extended operator.  */
 334   DEMANGLE_COMPONENT_EXTENDED_OPERATOR,
 335   /* A typecast, represented as a unary operator.  The one subtree is
 336      the type to which the argument should be cast.  */
 337   DEMANGLE_COMPONENT_CAST,
 338   /* A unary expression.  The left subtree is the operator, and the
 339      right subtree is the single argument.  */
 340   DEMANGLE_COMPONENT_UNARY,
 341   /* A binary expression.  The left subtree is the operator, and the
 342      right subtree is a BINARY_ARGS.  */
 343   DEMANGLE_COMPONENT_BINARY,
 344   /* Arguments to a binary expression.  The left subtree is the first
 345      argument, and the right subtree is the second argument.  */
 346   DEMANGLE_COMPONENT_BINARY_ARGS,
 347   /* A trinary expression.  The left subtree is the operator, and the
 348      right subtree is a TRINARY_ARG1.  */
 349   DEMANGLE_COMPONENT_TRINARY,
 350   /* Arguments to a trinary expression.  The left subtree is the first
 351      argument, and the right subtree is a TRINARY_ARG2.  */
 352   DEMANGLE_COMPONENT_TRINARY_ARG1,
 353   /* More arguments to a trinary expression.  The left subtree is the
 354      second argument, and the right subtree is the third argument.  */
 355   DEMANGLE_COMPONENT_TRINARY_ARG2,
 356   /* A literal.  The left subtree is the type, and the right subtree
 357      is the value, represented as a DEMANGLE_COMPONENT_NAME.  */
 358   DEMANGLE_COMPONENT_LITERAL,
 359   /* A negative literal.  Like LITERAL, but the value is negated.
 360      This is a minor hack: the NAME used for LITERAL points directly
 361      to the mangled string, but since negative numbers are mangled
 362      using 'n' instead of '-', we want a way to indicate a negative
 363      number which involves neither modifying the mangled string nor
 364      allocating a new copy of the literal in memory.  */
 365   DEMANGLE_COMPONENT_LITERAL_NEG
 366 };
 367
 368 /* Types which are only used internally.  */
 369
 370 struct demangle_operator_info;
 371 struct demangle_builtin_type_info;
 372
 373 /* A node in the tree representation is an instance of a struct
 374    demangle_component.  Note that the field names of the struct are
 375    not well protected against macros defined by the file including
 376    this one.  We can fix this if it ever becomes a problem.  */
 377
 378 struct demangle_component
 379 {
 380   /* The type of this component.  */
 381   enum demangle_component_type type;
 382
 383   union
 384   {
 385     /* For DEMANGLE_COMPONENT_NAME.  */
 386     struct
 387     {
 388       /* A pointer to the name (which need not NULL terminated) and
 389          its length.  */
 390       const char *s;
 391       int len;
 392     } s_name;
 393
 394     /* For DEMANGLE_COMPONENT_OPERATOR.  */
 395     struct
 396     {
 397       /* Operator.  */
 398       const struct demangle_operator_info *op;
 399     } s_operator;
 400
 401     /* For DEMANGLE_COMPONENT_EXTENDED_OPERATOR.  */
 402     struct
 403     {
 404       /* Number of arguments.  */
 405       int args;
 406       /* Name.  */
 407       struct demangle_component *name;
 408     } s_extended_operator;
 409
 410     /* For DEMANGLE_COMPONENT_CTOR.  */
 411     struct
 412     {
 413       /* Kind of constructor.  */
 414       enum gnu_v3_ctor_kinds kind;
 415       /* Name.  */
 416       struct demangle_component *name;
 417     } s_ctor;
 418
 419     /* For DEMANGLE_COMPONENT_DTOR.  */
 420     struct
 421     {
 422       /* Kind of destructor.  */
 423       enum gnu_v3_dtor_kinds kind;
 424       /* Name.  */
 425       struct demangle_component *name;
 426     } s_dtor;
 427
 428     /* For DEMANGLE_COMPONENT_BUILTIN_TYPE.  */
 429     struct
 430     {
 431       /* Builtin type.  */
 432       const struct demangle_builtin_type_info *type;
 433     } s_builtin;
 434
 435     /* For DEMANGLE_COMPONENT_SUB_STD.  */
 436     struct
 437     {
 438       /* Standard substitution string.  */
 439       const char* string;
 440       /* Length of string.  */
 441       int len;
 442     } s_string;
 443
 444     /* For DEMANGLE_COMPONENT_TEMPLATE_PARAM.  */
 445     struct
 446     {
 447       /* Template parameter index.  */
 448       long number;
 449     } s_number;
 450
 451     /* For other types.  */
 452     struct
 453     {
 454       /* Left (or only) subtree.  */
 455       struct demangle_component *left;
 456       /* Right subtree.  */
 457       struct demangle_component *right;
 458     } s_binary;
 459
 460   } u;
 461 };
 462
 463 /* People building mangled trees are expected to allocate instances of
 464    struct demangle_component themselves.  They can then call one of
 465    the following functions to fill them in.  */
 466
 467 /* Fill in most component types with a left subtree and a right
 468    subtree.  Returns non-zero on success, zero on failure, such as an
 469    unrecognized or inappropriate component type.  */
 470
 471 extern int
 472 cplus_demangle_fill_component (struct demangle_component *fill,
 473                                enum demangle_component_type,
 474                                struct demangle_component *left,
 475                                struct demangle_component *right);
 476
 477 /* Fill in a DEMANGLE_COMPONENT_NAME.  Returns non-zero on success,
 478    zero for bad arguments.  */
 479
 480 extern int
 481 cplus_demangle_fill_name (struct demangle_component *fill,
 482                           const char *, int);
 483
 484 /* Fill in a DEMANGLE_COMPONENT_BUILTIN_TYPE, using the name of the
 485    builtin type (e.g., "int", etc.).  Returns non-zero on success,
 486    zero if the type is not recognized.  */
 487
 488 extern int
 489 cplus_demangle_fill_builtin_type (struct demangle_component *fill,
 490                                   const char *type_name);
 491
 492 /* Fill in a DEMANGLE_COMPONENT_OPERATOR, using the name of the
 493    operator and the number of arguments which it takes (the latter is
 494    used to disambiguate operators which can be both binary and unary,
 495    such as '-').  Returns non-zero on success, zero if the operator is
 496    not recognized.  */
 497
 498 extern int
 499 cplus_demangle_fill_operator (struct demangle_component *fill,
 500                               const char *opname, int args);
 501
 502 /* Fill in a DEMANGLE_COMPONENT_EXTENDED_OPERATOR, providing the
 503    number of arguments and the name.  Returns non-zero on success,
 504    zero for bad arguments.  */
 505
 506 extern int
 507 cplus_demangle_fill_extended_operator (struct demangle_component *fill,
 508                                        int numargs,
 509                                        struct demangle_component *nm);
 510
 511 /* Fill in a DEMANGLE_COMPONENT_CTOR.  Returns non-zero on success,
 512    zero for bad arguments.  */
 513
 514 extern int
 515 cplus_demangle_fill_ctor (struct demangle_component *fill,
 516                           enum gnu_v3_ctor_kinds kind,
 517                           struct demangle_component *name);
 518
 519 /* Fill in a DEMANGLE_COMPONENT_DTOR.  Returns non-zero on success,
 520    zero for bad arguments.  */
 521
 522 extern int
 523 cplus_demangle_fill_dtor (struct demangle_component *fill,
 524                           enum gnu_v3_dtor_kinds kind,
 525                           struct demangle_component *name);
 526
 527 /* This function translates a mangled name into a struct
 528    demangle_component tree.  The first argument is the mangled name.
 529    The second argument is DMGL_* options.  This returns a pointer to a
 530    tree on success, or NULL on failure.  On success, the third
 531    argument is set to a block of memory allocated by malloc.  This
 532    block should be passed to free when the tree is no longer
 533    needed.  */
 534
 535 extern struct demangle_component *
 536 cplus_demangle_v3_components (const char *mangled, int options, void **mem);
 537
 538 /* This function takes a struct demangle_component tree and returns
 539    the corresponding demangled string.  The first argument is DMGL_*
 540    options.  The second is the tree to demangle.  The third is a guess
 541    at the length of the demangled string, used to initially allocate
 542    the return buffer.  The fourth is a pointer to a size_t.  On
 543    success, this function returns a buffer allocated by malloc(), and
 544    sets the size_t pointed to by the fourth argument to the size of
 545    the allocated buffer (not the length of the returned string).  On
 546    failure, this function returns NULL, and sets the size_t pointed to
 547    by the fourth argument to 0 for an invalid tree, or to 1 for a
 548    memory allocation error.  */
 549
 550 extern char *
 551 cplus_demangle_print (int options,
 552                       const struct demangle_component *tree,
 553                       int estimated_length,
 554                       size_t *p_allocated_size);
 555
 556 /* This function takes a struct demangle_component tree and passes back
 557    a demangled string in one or more calls to a callback function.
 558    The first argument is DMGL_* options.  The second is the tree to
 559    demangle.  The third is a pointer to a callback function; on each call
 560    this receives an element of the demangled string, its length, and an
 561    opaque value.  The fourth is the opaque value passed to the callback.
 562    The callback is called once or more to return the full demangled
 563    string.  The demangled element string is always nul-terminated, though
 564    its length is also provided for convenience.  In contrast to
 565    cplus_demangle_print(), this function does not allocate heap memory
 566    to grow output strings (except perhaps where alloca() is implemented
 567    by malloc()), and so is normally safe for use where the heap has been
 568    corrupted.  On success, this function returns 1; on failure, 0.  */
 569
 570 extern int
 571 cplus_demangle_print_callback (int options,
 572                                const struct demangle_component *tree,
 573                                demangle_callbackref callback, void *opaque);
 574
 575 #ifdef __cplusplus
 576 }
 577 #endif /* __cplusplus */
 578
 579 #endif  /* DEMANGLE_H */