forked from OSchip/llvm-project
440 lines
15 KiB
C++
440 lines
15 KiB
C++
//===-- Mangled.cpp -------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Core/Mangled.h"
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#include "lldb/Core/RichManglingContext.h"
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#include "lldb/Utility/ConstString.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/Logging.h"
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#include "lldb/Utility/RegularExpression.h"
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#include "lldb/Utility/Stream.h"
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#include "lldb/Utility/Timer.h"
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#include "lldb/lldb-enumerations.h"
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#include "Plugins/Language/CPlusPlus/CPlusPlusLanguage.h"
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#include "Plugins/Language/ObjC/ObjCLanguage.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Demangle/Demangle.h"
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#include "llvm/Support/Compiler.h"
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#include <mutex>
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#include <string>
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#include <utility>
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#include <stdlib.h>
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#include <string.h>
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using namespace lldb_private;
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static inline bool cstring_is_mangled(llvm::StringRef s) {
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return Mangled::GetManglingScheme(s) != Mangled::eManglingSchemeNone;
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}
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static ConstString
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get_demangled_name_without_arguments(ConstString mangled,
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ConstString demangled) {
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// This pair is <mangled name, demangled name without function arguments>
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static std::pair<ConstString, ConstString>
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g_most_recent_mangled_to_name_sans_args;
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// Need to have the mangled & demangled names we're currently examining as
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// statics so we can return a const ref to them at the end of the func if we
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// don't have anything better.
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static ConstString g_last_mangled;
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static ConstString g_last_demangled;
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if (mangled && g_most_recent_mangled_to_name_sans_args.first == mangled) {
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return g_most_recent_mangled_to_name_sans_args.second;
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}
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g_last_demangled = demangled;
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g_last_mangled = mangled;
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const char *mangled_name_cstr = mangled.GetCString();
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if (demangled && mangled_name_cstr && mangled_name_cstr[0]) {
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if (mangled_name_cstr[0] == '_' && mangled_name_cstr[1] == 'Z' &&
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(mangled_name_cstr[2] != 'T' && // avoid virtual table, VTT structure,
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// typeinfo structure, and typeinfo
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// mangled_name
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mangled_name_cstr[2] != 'G' && // avoid guard variables
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mangled_name_cstr[2] != 'Z')) // named local entities (if we eventually
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// handle eSymbolTypeData, we will want
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// this back)
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{
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CPlusPlusLanguage::MethodName cxx_method(demangled);
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if (!cxx_method.GetBasename().empty()) {
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std::string shortname;
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if (!cxx_method.GetContext().empty())
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shortname = cxx_method.GetContext().str() + "::";
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shortname += cxx_method.GetBasename().str();
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ConstString result(shortname.c_str());
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g_most_recent_mangled_to_name_sans_args.first = mangled;
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g_most_recent_mangled_to_name_sans_args.second = result;
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return g_most_recent_mangled_to_name_sans_args.second;
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}
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}
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}
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if (demangled)
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return g_last_demangled;
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return g_last_mangled;
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}
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#pragma mark Mangled
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Mangled::ManglingScheme Mangled::GetManglingScheme(llvm::StringRef const name) {
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if (name.empty())
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return Mangled::eManglingSchemeNone;
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if (name.startswith("?"))
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return Mangled::eManglingSchemeMSVC;
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if (name.startswith("_Z"))
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return Mangled::eManglingSchemeItanium;
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// ___Z is a clang extension of block invocations
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if (name.startswith("___Z"))
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return Mangled::eManglingSchemeItanium;
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return Mangled::eManglingSchemeNone;
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}
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Mangled::Mangled(ConstString s) : m_mangled(), m_demangled() {
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if (s)
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SetValue(s);
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}
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Mangled::Mangled(llvm::StringRef name) {
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if (!name.empty())
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SetValue(ConstString(name));
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}
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// Convert to pointer operator. This allows code to check any Mangled objects
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// to see if they contain anything valid using code such as:
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//
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// Mangled mangled(...);
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// if (mangled)
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// { ...
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Mangled::operator void *() const {
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return (m_mangled) ? const_cast<Mangled *>(this) : nullptr;
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}
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// Logical NOT operator. This allows code to check any Mangled objects to see
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// if they are invalid using code such as:
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//
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// Mangled mangled(...);
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// if (!file_spec)
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// { ...
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bool Mangled::operator!() const { return !m_mangled; }
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// Clear the mangled and demangled values.
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void Mangled::Clear() {
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m_mangled.Clear();
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m_demangled.Clear();
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}
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// Compare the string values.
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int Mangled::Compare(const Mangled &a, const Mangled &b) {
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return ConstString::Compare(a.GetName(ePreferMangled),
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b.GetName(ePreferMangled));
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}
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// Set the string value in this objects. If "mangled" is true, then the mangled
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// named is set with the new value in "s", else the demangled name is set.
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void Mangled::SetValue(ConstString s, bool mangled) {
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if (s) {
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if (mangled) {
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m_demangled.Clear();
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m_mangled = s;
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} else {
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m_demangled = s;
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m_mangled.Clear();
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}
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} else {
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m_demangled.Clear();
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m_mangled.Clear();
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}
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}
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void Mangled::SetValue(ConstString name) {
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if (name) {
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if (cstring_is_mangled(name.GetStringRef())) {
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m_demangled.Clear();
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m_mangled = name;
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} else {
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m_demangled = name;
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m_mangled.Clear();
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}
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} else {
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m_demangled.Clear();
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m_mangled.Clear();
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}
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}
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// Local helpers for different demangling implementations.
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static char *GetMSVCDemangledStr(const char *M) {
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char *demangled_cstr = llvm::microsoftDemangle(
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M, nullptr, nullptr, nullptr, nullptr,
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llvm::MSDemangleFlags(llvm::MSDF_NoAccessSpecifier |
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llvm::MSDF_NoCallingConvention |
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llvm::MSDF_NoMemberType));
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if (Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_DEMANGLE)) {
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if (demangled_cstr && demangled_cstr[0])
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LLDB_LOGF(log, "demangled msvc: %s -> \"%s\"", M, demangled_cstr);
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else
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LLDB_LOGF(log, "demangled msvc: %s -> error", M);
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}
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return demangled_cstr;
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}
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static char *GetItaniumDemangledStr(const char *M) {
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char *demangled_cstr = nullptr;
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llvm::ItaniumPartialDemangler ipd;
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bool err = ipd.partialDemangle(M);
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if (!err) {
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// Default buffer and size (will realloc in case it's too small).
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size_t demangled_size = 80;
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demangled_cstr = static_cast<char *>(std::malloc(demangled_size));
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demangled_cstr = ipd.finishDemangle(demangled_cstr, &demangled_size);
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assert(demangled_cstr &&
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"finishDemangle must always succeed if partialDemangle did");
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assert(demangled_cstr[demangled_size - 1] == '\0' &&
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"Expected demangled_size to return length including trailing null");
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}
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if (Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_DEMANGLE)) {
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if (demangled_cstr)
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LLDB_LOGF(log, "demangled itanium: %s -> \"%s\"", M, demangled_cstr);
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else
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LLDB_LOGF(log, "demangled itanium: %s -> error: failed to demangle", M);
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}
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return demangled_cstr;
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}
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// Explicit demangling for scheduled requests during batch processing. This
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// makes use of ItaniumPartialDemangler's rich demangle info
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bool Mangled::DemangleWithRichManglingInfo(
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RichManglingContext &context, SkipMangledNameFn *skip_mangled_name) {
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// We need to generate and cache the demangled name.
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static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
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Timer scoped_timer(func_cat,
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"Mangled::DemangleWithRichNameIndexInfo (m_mangled = %s)",
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m_mangled.GetCString());
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// Others are not meant to arrive here. ObjC names or C's main() for example
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// have their names stored in m_demangled, while m_mangled is empty.
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assert(m_mangled);
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// Check whether or not we are interested in this name at all.
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ManglingScheme scheme = GetManglingScheme(m_mangled.GetStringRef());
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if (skip_mangled_name && skip_mangled_name(m_mangled.GetStringRef(), scheme))
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return false;
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switch (scheme) {
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case eManglingSchemeNone:
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// The current mangled_name_filter would allow llvm_unreachable here.
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return false;
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case eManglingSchemeItanium:
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// We want the rich mangling info here, so we don't care whether or not
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// there is a demangled string in the pool already.
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if (context.FromItaniumName(m_mangled)) {
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// If we got an info, we have a name. Copy to string pool and connect the
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// counterparts to accelerate later access in GetDemangledName().
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context.ParseFullName();
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m_demangled.SetStringWithMangledCounterpart(context.GetBufferRef(),
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m_mangled);
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return true;
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} else {
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m_demangled.SetCString("");
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return false;
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}
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case eManglingSchemeMSVC: {
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// We have no rich mangling for MSVC-mangled names yet, so first try to
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// demangle it if necessary.
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if (!m_demangled && !m_mangled.GetMangledCounterpart(m_demangled)) {
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if (char *d = GetMSVCDemangledStr(m_mangled.GetCString())) {
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// If we got an info, we have a name. Copy to string pool and connect
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// the counterparts to accelerate later access in GetDemangledName().
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m_demangled.SetStringWithMangledCounterpart(llvm::StringRef(d),
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m_mangled);
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::free(d);
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} else {
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m_demangled.SetCString("");
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}
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}
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if (m_demangled.IsEmpty()) {
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// Cannot demangle it, so don't try parsing.
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return false;
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} else {
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// Demangled successfully, we can try and parse it with
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// CPlusPlusLanguage::MethodName.
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return context.FromCxxMethodName(m_demangled);
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}
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}
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}
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llvm_unreachable("Fully covered switch above!");
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}
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// Generate the demangled name on demand using this accessor. Code in this
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// class will need to use this accessor if it wishes to decode the demangled
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// name. The result is cached and will be kept until a new string value is
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// supplied to this object, or until the end of the object's lifetime.
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ConstString Mangled::GetDemangledName() const {
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// Check to make sure we have a valid mangled name and that we haven't
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// already decoded our mangled name.
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if (m_mangled && m_demangled.IsNull()) {
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// We need to generate and cache the demangled name.
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static Timer::Category func_cat(LLVM_PRETTY_FUNCTION);
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Timer scoped_timer(func_cat, "Mangled::GetDemangledName (m_mangled = %s)",
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m_mangled.GetCString());
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// Don't bother running anything that isn't mangled
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const char *mangled_name = m_mangled.GetCString();
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ManglingScheme mangling_scheme = GetManglingScheme(m_mangled.GetStringRef());
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if (mangling_scheme != eManglingSchemeNone &&
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!m_mangled.GetMangledCounterpart(m_demangled)) {
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// We didn't already mangle this name, demangle it and if all goes well
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// add it to our map.
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char *demangled_name = nullptr;
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switch (mangling_scheme) {
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case eManglingSchemeMSVC:
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demangled_name = GetMSVCDemangledStr(mangled_name);
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break;
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case eManglingSchemeItanium: {
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demangled_name = GetItaniumDemangledStr(mangled_name);
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break;
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}
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case eManglingSchemeNone:
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llvm_unreachable("eManglingSchemeNone was handled already");
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}
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if (demangled_name) {
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m_demangled.SetStringWithMangledCounterpart(
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llvm::StringRef(demangled_name), m_mangled);
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free(demangled_name);
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}
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}
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if (m_demangled.IsNull()) {
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// Set the demangled string to the empty string to indicate we tried to
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// parse it once and failed.
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m_demangled.SetCString("");
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}
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}
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return m_demangled;
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}
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ConstString
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Mangled::GetDisplayDemangledName() const {
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return GetDemangledName();
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}
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bool Mangled::NameMatches(const RegularExpression ®ex) const {
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if (m_mangled && regex.Execute(m_mangled.GetStringRef()))
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return true;
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ConstString demangled = GetDemangledName();
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return demangled && regex.Execute(demangled.GetStringRef());
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}
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// Get the demangled name if there is one, else return the mangled name.
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ConstString Mangled::GetName(Mangled::NamePreference preference) const {
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if (preference == ePreferMangled && m_mangled)
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return m_mangled;
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ConstString demangled = GetDemangledName();
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if (preference == ePreferDemangledWithoutArguments) {
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return get_demangled_name_without_arguments(m_mangled, demangled);
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}
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if (preference == ePreferDemangled) {
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// Call the accessor to make sure we get a demangled name in case it hasn't
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// been demangled yet...
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if (demangled)
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return demangled;
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return m_mangled;
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}
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return demangled;
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}
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// Dump a Mangled object to stream "s". We don't force our demangled name to be
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// computed currently (we don't use the accessor).
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void Mangled::Dump(Stream *s) const {
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if (m_mangled) {
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*s << ", mangled = " << m_mangled;
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}
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if (m_demangled) {
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const char *demangled = m_demangled.AsCString();
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s->Printf(", demangled = %s", demangled[0] ? demangled : "<error>");
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}
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}
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// Dumps a debug version of this string with extra object and state information
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// to stream "s".
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void Mangled::DumpDebug(Stream *s) const {
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s->Printf("%*p: Mangled mangled = ", static_cast<int>(sizeof(void *) * 2),
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static_cast<const void *>(this));
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m_mangled.DumpDebug(s);
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s->Printf(", demangled = ");
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m_demangled.DumpDebug(s);
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}
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// Return the size in byte that this object takes in memory. The size includes
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// the size of the objects it owns, and not the strings that it references
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// because they are shared strings.
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size_t Mangled::MemorySize() const {
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return m_mangled.MemorySize() + m_demangled.MemorySize();
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}
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// We "guess" the language because we can't determine a symbol's language from
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// it's name. For example, a Pascal symbol can be mangled using the C++
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// Itanium scheme, and defined in a compilation unit within the same module as
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// other C++ units. In addition, different targets could have different ways
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// of mangling names from a given language, likewise the compilation units
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// within those targets.
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lldb::LanguageType Mangled::GuessLanguage() const {
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ConstString mangled = GetMangledName();
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if (mangled) {
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const char *mangled_name = mangled.GetCString();
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if (CPlusPlusLanguage::IsCPPMangledName(mangled_name))
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return lldb::eLanguageTypeC_plus_plus;
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} else {
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// ObjC names aren't really mangled, so they won't necessarily be in the
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// mangled name slot.
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ConstString demangled_name = GetDemangledName();
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if (demangled_name
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&& ObjCLanguage::IsPossibleObjCMethodName(demangled_name.GetCString()))
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return lldb::eLanguageTypeObjC;
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}
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return lldb::eLanguageTypeUnknown;
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}
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// Dump OBJ to the supplied stream S.
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Stream &operator<<(Stream &s, const Mangled &obj) {
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if (obj.GetMangledName())
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s << "mangled = '" << obj.GetMangledName() << "'";
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ConstString demangled = obj.GetDemangledName();
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if (demangled)
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s << ", demangled = '" << demangled << '\'';
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else
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s << ", demangled = <error>";
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return s;
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}
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