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+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// This file has been modified by Huawei.
+// Copyright (C) 2018-2019, Huawei.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Satoru Takabayashi
+//
+// For reference check out:
+// http://www.codesourcery.com/public/cxx-abi/abi.html#mangling
+//
+// Note that we only have partial C++0x support yet.
+
+#include <stdio.h> // for NULL
+#include "demangle.h"
+
+_START_GOOGLE_NAMESPACE_
+
+typedef struct {
+ const char *abbrev;
+ const char *real_name;
+} AbbrevPair;
+
+// List of operators from Itanium C++ ABI.
+static const AbbrevPair kOperatorList[] = {
+ { "nw", "new" },
+ { "na", "new[]" },
+ { "dl", "delete" },
+ { "da", "delete[]" },
+ { "ps", "+" },
+ { "ng", "-" },
+ { "ad", "&" },
+ { "de", "*" },
+ { "co", "~" },
+ { "pl", "+" },
+ { "mi", "-" },
+ { "ml", "*" },
+ { "dv", "/" },
+ { "rm", "%" },
+ { "an", "&" },
+ { "or", "|" },
+ { "eo", "^" },
+ { "aS", "=" },
+ { "pL", "+=" },
+ { "mI", "-=" },
+ { "mL", "*=" },
+ { "dV", "/=" },
+ { "rM", "%=" },
+ { "aN", "&=" },
+ { "oR", "|=" },
+ { "eO", "^=" },
+ { "ls", "<<" },
+ { "rs", ">>" },
+ { "lS", "<<=" },
+ { "rS", ">>=" },
+ { "eq", "==" },
+ { "ne", "!=" },
+ { "lt", "<" },
+ { "gt", ">" },
+ { "le", "<=" },
+ { "ge", ">=" },
+ { "nt", "!" },
+ { "aa", "&&" },
+ { "oo", "||" },
+ { "pp", "++" },
+ { "mm", "--" },
+ { "cm", "," },
+ { "pm", "->*" },
+ { "pt", "->" },
+ { "cl", "()" },
+ { "ix", "[]" },
+ { "qu", "?" },
+ { "st", "sizeof" },
+ { "sz", "sizeof" },
+ { NULL, NULL },
+};
+/**/
+// List of builtin types from Itanium C++ ABI.
+static const AbbrevPair kBuiltinTypeList[] = {
+ { "v", "void" },
+ { "w", "wchar_t" },
+ { "b", "bool" },
+ { "c", "char" },
+ { "a", "signed char" },
+ { "h", "unsigned char" },
+ { "s", "short" },
+ { "t", "unsigned short" },
+ { "i", "int" },
+ { "j", "unsigned int" },
+ { "l", "long" },
+ { "m", "unsigned long" },
+ { "x", "long long" },
+ { "y", "unsigned long long" },
+ { "n", "__int128" },
+ { "o", "unsigned __int128" },
+ { "f", "float" },
+ { "d", "double" },
+ { "e", "long double" },
+ { "g", "__float128" },
+ { "z", "ellipsis" },
+ { NULL, NULL }
+};
+
+// List of substitutions Itanium C++ ABI.
+static const AbbrevPair kSubstitutionList[] = {
+ { "St", "" },
+ { "Sa", "allocator" },
+ { "Sb", "basic_string" },
+ // std::basic_string<char, std::char_traits<char>,std::allocator<char> >
+ { "Ss", "string"},
+ // std::basic_istream<char, std::char_traits<char> >
+ { "Si", "istream" },
+ // std::basic_ostream<char, std::char_traits<char> >
+ { "So", "ostream" },
+ // std::basic_iostream<char, std::char_traits<char> >
+ { "Sd", "iostream" },
+ { NULL, NULL }
+};
+/**/
+
+// State needed for demangling.
+typedef struct {
+ const char *mangled_cur; // Cursor of mangled name.
+ char *out_cur; // Cursor of output string.
+ const char *out_begin; // Beginning of output string.
+ const char *out_end; // End of output string.
+ const char *prev_name; // For constructors/destructors.
+ int prev_name_length; // For constructors/destructors.
+ short nest_level; // For nested names.
+ bool append; // Append flag.
+ /**/
+ bool overflowed; //// True if output gets overflowed.
+ /**/
+} State;
+
+// We don't use strlen() in libc since it's not guaranteed to be async
+// signal safe.
+static size_t StrLen(const char *str) {
+ size_t len = 0;
+ while (*str != '\0') {
+ ++str;
+ ++len;
+ }
+ return len;
+}
+
+// Returns true if "str" has at least "n" characters remaining.
+static bool AtLeastNumCharsRemaining(const char *str, int n) {
+ for (int i = 0; i < n; ++i) {
+ if (str[i] == '\0') {
+ return false;
+ }
+ }
+ return true;
+}
+
+// Returns true if "str" has "prefix" as a prefix.
+static bool StrPrefix(const char *str, const char *prefix) {
+ size_t i = 0;
+ while (str[i] != '\0' && prefix[i] != '\0' &&
+ str[i] == prefix[i]) {
+ ++i;
+ }
+ return prefix[i] == '\0'; // Consumed everything in "prefix".
+}
+
+static void InitState(State *state, const char *mangled,
+ char *out, int out_size) {
+ state->mangled_cur = mangled;
+ state->out_cur = out;
+ state->out_begin = out;
+ state->out_end = out + out_size;
+ state->prev_name = NULL;
+ state->prev_name_length = -1;
+ state->nest_level = -1;
+ state->append = true;
+ state->overflowed = false;
+}
+
+// Returns true and advances "mangled_cur" if we find "one_char_token"
+// at "mangled_cur" position. It is assumed that "one_char_token" does
+// not contain '\0'.
+static bool ParseOneCharToken(State *state, const char one_char_token) {
+ if (state->mangled_cur[0] == one_char_token) {
+ ++state->mangled_cur;
+ return true;
+ }
+ return false;
+}
+
+// Returns true and advances "mangled_cur" if we find "two_char_token"
+// at "mangled_cur" position. It is assumed that "two_char_token" does
+// not contain '\0'.
+static bool ParseTwoCharToken(State *state, const char *two_char_token) {
+ if (state->mangled_cur[0] == two_char_token[0] &&
+ state->mangled_cur[1] == two_char_token[1]) {
+ state->mangled_cur += 2;
+ return true;
+ }
+ return false;
+}
+
+// Returns true and advances "mangled_cur" if we find any character in
+// "char_class" at "mangled_cur" position.
+static bool ParseCharClass(State *state, const char *char_class) {
+ if (state->mangled_cur[0] == '\0') {
+ return false;
+ }
+ const char *p = char_class;
+ for (; *p != '\0'; ++p) {
+ if (state->mangled_cur[0] == *p) {
+ ++state->mangled_cur;
+ return true;
+ }
+ }
+ return false;
+}
+
+// This function is used for handling an optional non-terminal.
+static bool Optional(bool) {
+ return true;
+}
+
+// This function is used for handling <non-terminal>+ syntax.
+typedef bool (*ParseFunc)(State *);
+static bool OneOrMore(ParseFunc parse_func, State *state) {
+ if (parse_func(state)) {
+ while (parse_func(state)) {
+ }
+ return true;
+ }
+ return false;
+}
+
+// This function is used for handling <non-terminal>* syntax. The function
+// always returns true and must be followed by a termination token or a
+// terminating sequence not handled by parse_func (e.g.
+// ParseOneCharToken(state, 'E')).
+static bool ZeroOrMore(ParseFunc parse_func, State *state) {
+ while (parse_func(state)) {
+ }
+ return true;
+}
+
+// Append "str" at "out_cur". If there is an overflow, "overflowed"
+// is set to true for later use. The output string is ensured to
+// always terminate with '\0' as long as there is no overflow.
+static void Append(State *state, const char * const str, const int length) {
+ int i;
+ for (i = 0; i < length; ++i) {
+ if (state->out_cur + 1 < state->out_end) { // +1 for '\0'
+ *state->out_cur = str[i];
+ ++state->out_cur;
+ } else {
+ state->overflowed = true;
+ break;
+ }
+ }
+ if (!state->overflowed) {
+ *state->out_cur = '\0'; // Terminate it with '\0'
+ }
+}
+
+// We don't use equivalents in libc to avoid locale issues.
+static bool IsLower(char c) {
+ return c >= 'a' && c <= 'z';
+}
+
+static bool IsAlpha(char c) {
+ return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
+}
+
+static bool IsDigit(char c) {
+ return c >= '0' && c <= '9';
+}
+
+// Returns true if "str" is a function clone suffix. These suffixes are used
+// by GCC 4.5.x and later versions to indicate functions which have been
+// cloned during optimization. We treat any sequence (.<alpha>+.<digit>+)+ as
+// a function clone suffix.
+static bool IsFunctionCloneSuffix(const char *str) {
+ size_t i = 0;
+ while (str[i] != '\0') {
+ // Consume a single .<alpha>+.<digit>+ sequence.
+ if (str[i] != '.' || !IsAlpha(str[i + 1])) {
+ return false;
+ }
+ i += 2;
+ while (IsAlpha(str[i])) {
+ ++i;
+ }
+ if (str[i] != '.' || !IsDigit(str[i + 1])) {
+ return false;
+ }
+ i += 2;
+ while (IsDigit(str[i])) {
+ ++i;
+ }
+ }
+ return true; // Consumed everything in "str".
+}
+
+// Append "str" with some tweaks, iff "append" state is true.
+// Returns true so that it can be placed in "if" conditions.
+static void MaybeAppendWithLength(State *state, const char * const str,
+ const int length) {
+ if (state->append && length > 0) {
+ // Append a space if the output buffer ends with '<' and "str"
+ // starts with '<' to avoid <<<.
+ if (str[0] == '<' && state->out_begin < state->out_cur &&
+ state->out_cur[-1] == '<') {
+ Append(state, " ", 1);
+ }
+ // Remember the last identifier name for ctors/dtors.
+ if (IsAlpha(str[0]) || str[0] == '_') {
+ state->prev_name = state->out_cur;
+ state->prev_name_length = length;
+ }
+ Append(state, str, length);
+ }
+}
+
+// A convenient wrapper arount MaybeAppendWithLength().
+static bool MaybeAppend(State *state, const char * const str) {
+ if (state->append) {
+ int length = StrLen(str);
+ MaybeAppendWithLength(state, str, length);
+ }
+ return true;
+}
+
+// This function is used for handling nested names.
+static bool EnterNestedName(State *state) {
+ state->nest_level = 0;
+ return true;
+}
+
+// This function is used for handling nested names.
+static bool LeaveNestedName(State *state, short prev_value) {
+ state->nest_level = prev_value;
+ return true;
+}
+
+// Disable the append mode not to print function parameters, etc.
+static bool DisableAppend(State *state) {
+ state->append = false;
+ return true;
+}
+
+// Restore the append mode to the previous state.
+static bool RestoreAppend(State *state, bool prev_value) {
+ state->append = prev_value;
+ return true;
+}
+
+// Increase the nest level for nested names.
+static void MaybeIncreaseNestLevel(State *state) {
+ if (state->nest_level > -1) {
+ ++state->nest_level;
+ }
+}
+
+// Appends :: for nested names if necessary.
+static void MaybeAppendSeparator(State *state) {
+ if (state->nest_level >= 1) {
+ MaybeAppend(state, "::");
+ }
+}
+
+/**/
+// Cancel the last separator if necessary.
+static void MaybeCancelLastSeparator(State *state) {
+ if (state->nest_level >= 1 && state->append &&
+ state->out_begin <= state->out_cur - 2) {
+ state->out_cur -= 2;
+ *state->out_cur = '\0';
+ }
+}
+/**/
+
+// Returns true if the identifier of the given length pointed to by
+// "mangled_cur" is anonymous namespace.
+static bool IdentifierIsAnonymousNamespace(State *state, int length) {
+ static const char anon_prefix[] = "_GLOBAL__N_";
+ return (length > (int)sizeof(anon_prefix) - 1 && // Should be longer.
+ StrPrefix(state->mangled_cur, anon_prefix));
+}
+
+// Forward declarations of our parsing functions.
+static bool ParseMangledName(State *state);
+static bool ParseEncoding(State *state);
+static bool ParseName(State *state);
+static bool ParseUnscopedName(State *state);
+static bool ParseUnscopedTemplateName(State *state);
+static bool ParseNestedName(State *state);
+static bool ParsePrefix(State *state);
+static bool ParseUnqualifiedName(State *state);
+static bool ParseSourceName(State *state);
+static bool ParseLocalSourceName(State *state);
+static bool ParseNumber(State *state, int *number_out);
+static bool ParseFloatNumber(State *state);
+static bool ParseSeqId(State *state);
+static bool ParseIdentifier(State *state, int length);
+static bool ParseOperatorName(State *state);
+static bool ParseSpecialName(State *state);
+static bool ParseCallOffset(State *state);
+static bool ParseNVOffset(State *state);
+static bool ParseVOffset(State *state);
+static bool ParseCtorDtorName(State *state);
+static bool ParseType(State *state);
+static bool ParseCVQualifiers(State *state);
+static bool ParseBuiltinType(State *state);
+static bool ParseFunctionType(State *state);
+static bool ParseBareFunctionType(State *state);
+static bool ParseClassEnumType(State *state);
+static bool ParseArrayType(State *state);
+static bool ParsePointerToMemberType(State *state);
+static bool ParseTemplateParam(State *state);
+static bool ParseTemplateTemplateParam(State *state);
+static bool ParseTemplateArgs(State *state);
+static bool ParseTemplateArg(State *state);
+static bool ParseExpression(State *state);
+static bool ParseExprPrimary(State *state);
+static bool ParseLocalName(State *state);
+static bool ParseDiscriminator(State *state);
+static bool ParseSubstitution(State *state);
+
+// Implementation note: the following code is a straightforward
+// translation of the Itanium C++ ABI defined in BNF with a couple of
+// exceptions.
+//
+// - Support GNU extensions not defined in the Itanium C++ ABI
+// - <prefix> and <template-prefix> are combined to avoid infinite loop
+// - Reorder patterns to shorten the code
+// - Reorder patterns to give greedier functions precedence
+// We'll mark "Less greedy than" for these cases in the code
+//
+// Each parsing function changes the state and returns true on
+// success. Otherwise, don't change the state and returns false. To
+// ensure that the state isn't changed in the latter case, we save the
+// original state before we call more than one parsing functions
+// consecutively with &&, and restore the state if unsuccessful. See
+// ParseEncoding() as an example of this convention. We follow the
+// convention throughout the code.
+//
+// Originally we tried to do demangling without following the full ABI
+// syntax but it turned out we needed to follow the full syntax to
+// parse complicated cases like nested template arguments. Note that
+// implementing a full-fledged demangler isn't trivial (libiberty's
+// cp-demangle.c has +4300 lines).
+//
+// Note that (foo) in <(foo) ...> is a modifier to be ignored.
+//
+// Reference:
+// - Itanium C++ ABI
+// <http://www.codesourcery.com/cxx-abi/abi.html#mangling>
+
+// <mangled-name> ::= _Z <encoding>
+static bool ParseMangledName(State *state) {
+ return ParseTwoCharToken(state, "_Z") && ParseEncoding(state);
+}
+
+// <encoding> ::= <(function) name> <bare-function-type>
+// ::= <(data) name>
+// ::= <special-name>
+static bool ParseEncoding(State *state) {
+ State copy = *state;
+ if (ParseName(state) && ParseBareFunctionType(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseName(state) || ParseSpecialName(state)) {
+ return true;
+ }
+ return false;
+}
+
+// <name> ::= <nested-name>
+// ::= <unscoped-template-name> <template-args>
+// ::= <unscoped-name>
+// ::= <local-name>
+static bool ParseName(State *state) {
+ if (ParseNestedName(state) || ParseLocalName(state)) {
+ return true;
+ }
+
+ State copy = *state;
+ if (ParseUnscopedTemplateName(state) &&
+ ParseTemplateArgs(state)) {
+ return true;
+ }
+ *state = copy;
+
+ // Less greedy than <unscoped-template-name> <template-args>.
+ if (ParseUnscopedName(state)) {
+ return true;
+ }
+ return false;
+}
+
+// <unscoped-name> ::= <unqualified-name>
+// ::= St <unqualified-name>
+static bool ParseUnscopedName(State *state) {
+ if (ParseUnqualifiedName(state)) {
+ return true;
+ }
+
+ State copy = *state;
+ if (ParseTwoCharToken(state, "St") &&
+ MaybeAppend(state, "std::") &&
+ ParseUnqualifiedName(state)) {
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <unscoped-template-name> ::= <unscoped-name>
+// ::= <substitution>
+static bool ParseUnscopedTemplateName(State *state) {
+ return ParseUnscopedName(state) || ParseSubstitution(state);
+}
+
+// <nested-name> ::= N [<CV-qualifiers>] <prefix> <unqualified-name> E
+// ::= N [<CV-qualifiers>] <template-prefix> <template-args> E
+static bool ParseNestedName(State *state) {
+ State copy = *state;
+ if (ParseOneCharToken(state, 'N') &&
+ EnterNestedName(state) &&
+ Optional(ParseCVQualifiers(state)) &&
+ ParsePrefix(state) &&
+ LeaveNestedName(state, copy.nest_level) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// This part is tricky. If we literally translate them to code, we'll
+// end up infinite loop. Hence we merge them to avoid the case.
+//
+// <prefix> ::= <prefix> <unqualified-name>
+// ::= <template-prefix> <template-args>
+// ::= <template-param>
+// ::= <substitution>
+// ::= # empty
+// <template-prefix> ::= <prefix> <(template) unqualified-name>
+// ::= <template-param>
+// ::= <substitution>
+static bool ParsePrefix(State *state) {
+ bool has_something = false;
+ while (true) {
+ MaybeAppendSeparator(state);
+ if (ParseTemplateParam(state) ||
+ ParseSubstitution(state) ||
+ ParseUnscopedName(state)) {
+ has_something = true;
+ MaybeIncreaseNestLevel(state);
+ continue;
+ }
+ MaybeCancelLastSeparator(state);
+ if (has_something && ParseTemplateArgs(state)) {
+ return ParsePrefix(state);
+ } else {
+ break;
+ }
+ }
+ return true;
+}
+
+// <unqualified-name> ::= <operator-name>
+// ::= <ctor-dtor-name>
+// ::= <source-name>
+// ::= <local-source-name>
+static bool ParseUnqualifiedName(State *state) {
+ return (ParseOperatorName(state) ||
+ ParseCtorDtorName(state) ||
+ ParseSourceName(state) ||
+ ParseLocalSourceName(state));
+}
+
+// <source-name> ::= <positive length number> <identifier>
+static bool ParseSourceName(State *state) {
+ State copy = *state;
+ int length = -1;
+ if (ParseNumber(state, &length) && ParseIdentifier(state, length)) {
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <local-source-name> ::= L <source-name> [<discriminator>]
+//
+// References:
+// http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31775
+// http://gcc.gnu.org/viewcvs?view=rev&revision=124467
+static bool ParseLocalSourceName(State *state) {
+ State copy = *state; //
+ if (ParseOneCharToken(state, 'L') && ParseSourceName(state) &&
+ Optional(ParseDiscriminator(state))) {
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <number> ::= [n] <non-negative decimal integer>
+// If "number_out" is non-null, then *number_out is set to the value of the
+// parsed number on success.
+static bool ParseNumber(State *state, int *number_out) {
+ int sign = 1;
+ if (ParseOneCharToken(state, 'n')) {
+ sign = -1;
+ }
+ const char *p = state->mangled_cur;
+ int number = 0;
+ for (;*p != '\0'; ++p) {
+ if (IsDigit(*p)) {
+ number = number * 10 + (*p - '0');
+ } else {
+ break;
+ }
+ }
+ if (p != state->mangled_cur) { // Conversion succeeded.
+ state->mangled_cur = p;
+ if (number_out != NULL) {
+ *number_out = number * sign;
+ }
+ return true;
+ }
+ return false;
+}
+
+// Floating-point literals are encoded using a fixed-length lowercase
+// hexadecimal string.
+static bool ParseFloatNumber(State *state) {
+ const char *p = state->mangled_cur;
+ for (;*p != '\0'; ++p) {
+ if (!IsDigit(*p) && !(*p >= 'a' && *p <= 'f')) {
+ break;
+ }
+ }
+ if (p != state->mangled_cur) { // Conversion succeeded.
+ state->mangled_cur = p;
+ return true;
+ }
+ return false;
+}
+
+// The <seq-id> is a sequence number in base 36,
+// using digits and upper case letters
+static bool ParseSeqId(State *state) {
+ const char *p = state->mangled_cur;
+ for (;*p != '\0'; ++p) {
+ if (!IsDigit(*p) && !(*p >= 'A' && *p <= 'Z')) {
+ break;
+ }
+ }
+ if (p != state->mangled_cur) { // Conversion succeeded.
+ state->mangled_cur = p;
+ return true;
+ }
+ return false;
+}
+
+// <identifier> ::= <unqualified source code identifier> (of given length)
+static bool ParseIdentifier(State *state, int length) {
+ if (length == -1 ||
+ !AtLeastNumCharsRemaining(state->mangled_cur, length)) {
+ return false;
+ }
+ if (IdentifierIsAnonymousNamespace(state, length)) {
+ MaybeAppend(state, "(anonymous namespace)");
+ } else {
+ MaybeAppendWithLength(state, state->mangled_cur, length);
+ }
+ state->mangled_cur += length;
+ return true;
+}
+
+// <operator-name> ::= nw, and other two letters cases
+// ::= cv <type> # (cast)
+// ::= v <digit> <source-name> # vendor extended operator
+static bool ParseOperatorName(State *state) {
+ if (!AtLeastNumCharsRemaining(state->mangled_cur, 2)) {
+ return false;
+ }
+ // First check with "cv" (cast) case.
+ State copy = *state;
+ if (ParseTwoCharToken(state, "cv") &&
+ MaybeAppend(state, "operator ") &&
+ EnterNestedName(state) &&
+ ParseType(state) &&
+ LeaveNestedName(state, copy.nest_level)) {
+ return true;
+ }
+ *state = copy;
+
+ // Then vendor extended operators.
+ if (ParseOneCharToken(state, 'v') && ParseCharClass(state, "0123456789") &&
+ ParseSourceName(state)) {
+ return true;
+ }
+ *state = copy;
+
+ // Other operator names should start with a lower alphabet followed
+ // by a lower/upper alphabet.
+ if (!(IsLower(state->mangled_cur[0]) &&
+ IsAlpha(state->mangled_cur[1]))) {
+ return false;
+ }
+ // We may want to perform a binary search if we really need speed.
+ const AbbrevPair *p;
+ for (p = kOperatorList; p->abbrev != NULL; ++p) {
+ if (state->mangled_cur[0] == p->abbrev[0] &&
+ state->mangled_cur[1] == p->abbrev[1]) {
+ MaybeAppend(state, "operator");
+ if (IsLower(*p->real_name)) { // new, delete, etc.
+ MaybeAppend(state, " ");
+ }
+ MaybeAppend(state, p->real_name);
+ state->mangled_cur += 2;
+ return true;
+ }
+ }
+ return false;
+}
+
+// <special-name> ::= TV <type>
+// ::= TT <type>
+// ::= TI <type>
+// ::= TS <type>
+// ::= Tc <call-offset> <call-offset> <(base) encoding>
+// ::= GV <(object) name>
+// ::= T <call-offset> <(base) encoding>
+// G++ extensions:
+// ::= TC <type> <(offset) number> _ <(base) type>
+// ::= TF <type>
+// ::= TJ <type>
+// ::= GR <name>
+// ::= GA <encoding>
+// ::= Th <call-offset> <(base) encoding>
+// ::= Tv <call-offset> <(base) encoding>
+//
+// Note: we don't care much about them since they don't appear in
+// stack traces. The are special data.
+static bool ParseSpecialName(State *state) {
+ State copy = *state; //
+ if (ParseOneCharToken(state, 'T') &&
+ ParseCharClass(state, "VTIS") &&
+ ParseType(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseTwoCharToken(state, "Tc") && ParseCallOffset(state) &&
+ ParseCallOffset(state) && ParseEncoding(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseTwoCharToken(state, "GV") &&
+ ParseName(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseOneCharToken(state, 'T') && ParseCallOffset(state) &&
+ ParseEncoding(state)) {
+ return true;
+ }
+ *state = copy;
+
+ // G++ extensions
+ if (ParseTwoCharToken(state, "TC") && ParseType(state) &&
+ ParseNumber(state, NULL) && ParseOneCharToken(state, '_') &&
+ DisableAppend(state) &&
+ ParseType(state)) {
+ RestoreAppend(state, copy.append);
+ return true;
+ }
+ *state = copy;
+
+ if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "FJ") &&
+ ParseType(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseTwoCharToken(state, "GR") && ParseName(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseTwoCharToken(state, "GA") && ParseEncoding(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseOneCharToken(state, 'T') && ParseCharClass(state, "hv") &&
+ ParseCallOffset(state) && ParseEncoding(state)) {
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <call-offset> ::= h <nv-offset> _
+// ::= v <v-offset> _
+static bool ParseCallOffset(State *state) {
+ State copy = *state;
+ if (ParseOneCharToken(state, 'h') &&
+ ParseNVOffset(state) && ParseOneCharToken(state, '_')) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseOneCharToken(state, 'v') &&
+ ParseVOffset(state) && ParseOneCharToken(state, '_')) {
+ return true;
+ }
+ *state = copy;
+
+ return false;
+}
+
+// <nv-offset> ::= <(offset) number>
+static bool ParseNVOffset(State *state) {
+ return ParseNumber(state, NULL);
+}
+
+// <v-offset> ::= <(offset) number> _ <(virtual offset) number>
+static bool ParseVOffset(State *state) {
+ State copy = *state; //
+ if (ParseNumber(state, NULL) && ParseOneCharToken(state, '_') &&
+ ParseNumber(state, NULL)) {
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <ctor-dtor-name> ::= C1 | C2 | C3
+// ::= D0 | D1 | D2
+static bool ParseCtorDtorName(State *state) {
+ State copy = *state;
+ if (ParseOneCharToken(state, 'C') &&
+ ParseCharClass(state, "123")) {
+ const char * const prev_name = state->prev_name;
+ const int prev_name_length = state->prev_name_length;
+ MaybeAppendWithLength(state, prev_name, prev_name_length);
+ return true;
+ }
+ *state = copy;
+
+ if (ParseOneCharToken(state, 'D') &&
+ ParseCharClass(state, "012")) {
+ const char * const prev_name = state->prev_name;
+ const int prev_name_length = state->prev_name_length;
+ MaybeAppend(state, "~");
+ MaybeAppendWithLength(state, prev_name, prev_name_length);
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <type> ::= <CV-qualifiers> <type>
+// ::= P <type> # pointer-to
+// ::= R <type> # reference-to
+// ::= O <type> # rvalue reference-to (C++0x)
+// ::= C <type> # complex pair (C 2000)
+// ::= G <type> # imaginary (C 2000)
+// ::= U <source-name> <type> # vendor extended type qualifier
+// ::= <builtin-type>
+// ::= <function-type>
+// ::= <class-enum-type>
+// ::= <array-type>
+// ::= <pointer-to-member-type>
+// ::= <template-template-param> <template-args>
+// ::= <template-param>
+// ::= <substitution>
+// ::= Dp <type> # pack expansion of (C++0x)
+// ::= Dt <expression> E # decltype of an id-expression or class
+// # member access (C++0x)
+// ::= DT <expression> E # decltype of an expression (C++0x)
+//
+static bool ParseType(State *state) {
+ // We should check CV-qualifers, and PRGC things first.
+ State copy = *state;
+ if (ParseCVQualifiers(state) && ParseType(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseCharClass(state, "OPRCG") && ParseType(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseTwoCharToken(state, "Dp") && ParseType(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseOneCharToken(state, 'D') && ParseCharClass(state, "tT") &&
+ ParseExpression(state) && ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseOneCharToken(state, 'U') && ParseSourceName(state) &&
+ ParseType(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseBuiltinType(state) ||
+ ParseFunctionType(state) ||
+ ParseClassEnumType(state) ||
+ ParseArrayType(state) ||
+ ParsePointerToMemberType(state) ||
+ ParseSubstitution(state)) {
+ return true;
+ }
+
+ if (ParseTemplateTemplateParam(state) &&
+ ParseTemplateArgs(state)) {
+ return true;
+ }
+ *state = copy;
+
+ // Less greedy than <template-template-param> <template-args>.
+ if (ParseTemplateParam(state)) {
+ return true;
+ }
+
+ return false;
+}
+
+// <CV-qualifiers> ::= [r] [V] [K]
+// We don't allow empty <CV-qualifiers> to avoid infinite loop in
+// ParseType().
+static bool ParseCVQualifiers(State *state) {
+ int num_cv_qualifiers = 0;
+ num_cv_qualifiers += ParseOneCharToken(state, 'r');
+ num_cv_qualifiers += ParseOneCharToken(state, 'V');
+ num_cv_qualifiers += ParseOneCharToken(state, 'K');
+ return num_cv_qualifiers > 0;
+}
+
+// <builtin-type> ::= v, etc.
+// ::= u <source-name>
+static bool ParseBuiltinType(State *state) {
+ const AbbrevPair *p;
+ for (p = kBuiltinTypeList; p->abbrev != NULL; ++p) {
+ if (state->mangled_cur[0] == p->abbrev[0]) {
+ MaybeAppend(state, p->real_name);
+ ++state->mangled_cur;
+ return true;
+ }
+ }
+
+ State copy = *state;
+ if (ParseOneCharToken(state, 'u') && ParseSourceName(state)) {
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <function-type> ::= F [Y] <bare-function-type> E
+static bool ParseFunctionType(State *state) {
+ State copy = *state;
+ if (ParseOneCharToken(state, 'F') &&
+ Optional(ParseOneCharToken(state, 'Y')) &&
+ ParseBareFunctionType(state) && ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <bare-function-type> ::= <(signature) type>+
+static bool ParseBareFunctionType(State *state) {
+ State copy = *state; //
+ DisableAppend(state);
+ if (OneOrMore(ParseType, state)) {
+ RestoreAppend(state, copy.append);
+ MaybeAppend(state, "()");
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <class-enum-type> ::= <name>
+static bool ParseClassEnumType(State *state) {
+ return ParseName(state);
+}
+
+// <array-type> ::= A <(positive dimension) number> _ <(element) type>
+// ::= A [<(dimension) expression>] _ <(element) type>
+static bool ParseArrayType(State *state) {
+ State copy = *state;
+ if (ParseOneCharToken(state, 'A') && ParseNumber(state, NULL) &&
+ ParseOneCharToken(state, '_') && ParseType(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseOneCharToken(state, 'A') && Optional(ParseExpression(state)) &&
+ ParseOneCharToken(state, '_') && ParseType(state)) {
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <pointer-to-member-type> ::= M <(class) type> <(member) type>
+static bool ParsePointerToMemberType(State *state) {
+ State copy = *state; //
+ if (ParseOneCharToken(state, 'M') && ParseType(state) &&
+ ParseType(state)) {
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <template-param> ::= T_
+// ::= T <parameter-2 non-negative number> _
+static bool ParseTemplateParam(State *state) {
+ if (ParseTwoCharToken(state, "T_")) {
+ MaybeAppend(state, "?"); // We don't support template substitutions.
+ return true;
+ }
+
+ State copy = *state;
+ if (ParseOneCharToken(state, 'T') && ParseNumber(state, NULL) &&
+ ParseOneCharToken(state, '_')) {
+ MaybeAppend(state, "?"); // We don't support template substitutions.
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+
+// <template-template-param> ::= <template-param>
+// ::= <substitution>
+static bool ParseTemplateTemplateParam(State *state) {
+ return (ParseTemplateParam(state) ||
+ ParseSubstitution(state));
+}
+
+// <template-args> ::= I <template-arg>+ E
+static bool ParseTemplateArgs(State *state) {
+ State copy = *state; //
+ DisableAppend(state);
+ if (ParseOneCharToken(state, 'I') &&
+ OneOrMore(ParseTemplateArg, state) &&
+ ParseOneCharToken(state, 'E')) {
+ RestoreAppend(state, copy.append);
+ MaybeAppend(state, "<>");
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <template-arg> ::= <type>
+// ::= <expr-primary>
+// ::= I <template-arg>* E # argument pack
+// ::= X <expression> E
+static bool ParseTemplateArg(State *state) {
+ State copy = *state;
+ if (ParseOneCharToken(state, 'I') &&
+ ZeroOrMore(ParseTemplateArg, state) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseType(state) ||
+ ParseExprPrimary(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseOneCharToken(state, 'X') && ParseExpression(state) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <expression> ::= <template-param>
+// ::= <expr-primary>
+// ::= <unary operator-name> <expression>
+// ::= <binary operator-name> <expression> <expression>
+// ::= <trinary operator-name> <expression> <expression>
+// <expression>
+// ::= st <type>
+// ::= sr <type> <unqualified-name> <template-args>
+// ::= sr <type> <unqualified-name>
+static bool ParseExpression(State *state) {
+ if (ParseTemplateParam(state) || ParseExprPrimary(state)) {
+ return true;
+ }
+
+ State copy = *state;
+ if (ParseOperatorName(state) &&
+ ParseExpression(state) &&
+ ParseExpression(state) &&
+ ParseExpression(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseOperatorName(state) &&
+ ParseExpression(state) &&
+ ParseExpression(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseOperatorName(state) &&
+ ParseExpression(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseTwoCharToken(state, "st") && ParseType(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseTwoCharToken(state, "sr") && ParseType(state) &&
+ ParseUnqualifiedName(state) &&
+ ParseTemplateArgs(state)) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseTwoCharToken(state, "sr") && ParseType(state) &&
+ ParseUnqualifiedName(state)) {
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <expr-primary> ::= L <type> <(value) number> E
+// ::= L <type> <(value) float> E
+// ::= L <mangled-name> E
+// // A bug in g++'s C++ ABI version 2 (-fabi-version=2).
+// ::= LZ <encoding> E
+static bool ParseExprPrimary(State *state) {
+ State copy = *state; //
+ if (ParseOneCharToken(state, 'L') && ParseType(state) &&
+ ParseNumber(state, NULL) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseOneCharToken(state, 'L') && ParseType(state) &&
+ ParseFloatNumber(state) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseOneCharToken(state, 'L') && ParseMangledName(state) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseTwoCharToken(state, "LZ") && ParseEncoding(state) &&
+ ParseOneCharToken(state, 'E')) {
+ return true;
+ }
+ *state = copy;
+
+ return false;
+}
+
+// <local-name> := Z <(function) encoding> E <(entity) name>
+// [<discriminator>]
+// := Z <(function) encoding> E s [<discriminator>]
+static bool ParseLocalName(State *state) {
+ State copy = *state;
+ if (ParseOneCharToken(state, 'Z') && ParseEncoding(state) &&
+ ParseOneCharToken(state, 'E') && MaybeAppend(state, "::") &&
+ ParseName(state) && Optional(ParseDiscriminator(state))) {
+ return true;
+ }
+ *state = copy;
+
+ if (ParseOneCharToken(state, 'Z') && ParseEncoding(state) &&
+ ParseTwoCharToken(state, "Es") && Optional(ParseDiscriminator(state))) {
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <discriminator> := _ <(non-negative) number>
+static bool ParseDiscriminator(State *state) {
+ State copy = *state;
+ if (ParseOneCharToken(state, '_') && ParseNumber(state, NULL)) {
+ return true;
+ }
+ *state = copy;
+ return false;
+}
+
+// <substitution> ::= S_
+// ::= S <seq-id> _
+// ::= St, etc.
+static bool ParseSubstitution(State *state) {
+ if (ParseTwoCharToken(state, "S_")) {
+ MaybeAppend(state, "?"); // We don't support substitutions.
+ return true;
+ }
+
+ State copy = *state;
+ if (ParseOneCharToken(state, 'S') && ParseSeqId(state) &&
+ ParseOneCharToken(state, '_')) {
+ MaybeAppend(state, "?"); // We don't support substitutions.
+ return true;
+ }
+ *state = copy;
+
+ // Expand abbreviations like "St" => "std".
+ if (ParseOneCharToken(state, 'S')) {
+ const AbbrevPair *p;
+ for (p = kSubstitutionList; p->abbrev != NULL; ++p) {
+ if (state->mangled_cur[0] == p->abbrev[1]) {
+ MaybeAppend(state, "std");
+ if (p->real_name[0] != '\0') {
+ MaybeAppend(state, "::");
+ MaybeAppend(state, p->real_name);
+ }
+ ++state->mangled_cur;
+ return true;
+ }
+ }
+ }
+ *state = copy;
+ return false;
+}
+
+// Parse <mangled-name>, optionally followed by either a function-clone suffix
+// or version suffix. Returns true only if all of "mangled_cur" was consumed.
+static bool ParseTopLevelMangledName(State *state) {
+ if (ParseMangledName(state)) {
+ if (state->mangled_cur[0] != '\0') {
+ // Drop trailing function clone suffix, if any.
+ if (IsFunctionCloneSuffix(state->mangled_cur)) {
+ return true;
+ }
+ // Append trailing version suffix if any.
+ // ex. _Z3foo@@GLIBCXX_3.4
+ if (state->mangled_cur[0] == '@') {
+ MaybeAppend(state, state->mangled_cur);
+ return true;
+ }
+ return false; // Unconsumed suffix.
+ }
+ return true;
+ }
+ return false;
+}
+
+// The demangler entry point.
+bool Demangle(const char *mangled, char *out, int out_size) {
+ State state;
+ InitState(&state, mangled, out, out_size);
+ return ParseTopLevelMangledName(&state) && !state.overflowed;
+}
+
+_END_GOOGLE_NAMESPACE_