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500 lines
17 KiB
500 lines
17 KiB
//===-- LLVMSymbolize.cpp -------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Implementation for LLVM symbolization library.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DebugInfo/Symbolize/Symbolize.h"
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#include "SymbolizableObjectFile.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Config/config.h"
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#include "llvm/DebugInfo/DWARF/DWARFContext.h"
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#include "llvm/DebugInfo/PDB/PDB.h"
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#include "llvm/DebugInfo/PDB/PDBContext.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Object/ELFObjectFile.h"
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#include "llvm/Object/MachO.h"
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#include "llvm/Object/MachOUniversal.h"
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#include "llvm/Support/COFF.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/Compression.h"
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#include "llvm/Support/DataExtractor.h"
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#include "llvm/Support/Errc.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Path.h"
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#include <algorithm>
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#include <cassert>
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#include <cstdlib>
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#include <cstring>
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#if defined(_MSC_VER)
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#include <Windows.h>
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#include <DbgHelp.h>
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#pragma comment(lib, "dbghelp.lib")
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// Windows.h conflicts with our COFF header definitions.
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#ifdef IMAGE_FILE_MACHINE_I386
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#undef IMAGE_FILE_MACHINE_I386
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#endif
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#endif
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namespace llvm {
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namespace symbolize {
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Expected<DILineInfo> LLVMSymbolizer::symbolizeCode(const std::string &ModuleName,
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uint64_t ModuleOffset) {
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SymbolizableModule *Info;
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if (auto InfoOrErr = getOrCreateModuleInfo(ModuleName))
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Info = InfoOrErr.get();
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else
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return InfoOrErr.takeError();
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// A null module means an error has already been reported. Return an empty
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// result.
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if (!Info)
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return DILineInfo();
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// If the user is giving us relative addresses, add the preferred base of the
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// object to the offset before we do the query. It's what DIContext expects.
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if (Opts.RelativeAddresses)
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ModuleOffset += Info->getModulePreferredBase();
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DILineInfo LineInfo = Info->symbolizeCode(ModuleOffset, Opts.PrintFunctions,
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Opts.UseSymbolTable);
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if (Opts.Demangle)
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LineInfo.FunctionName = DemangleName(LineInfo.FunctionName, Info);
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return LineInfo;
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}
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Expected<DIInliningInfo>
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LLVMSymbolizer::symbolizeInlinedCode(const std::string &ModuleName,
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uint64_t ModuleOffset) {
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SymbolizableModule *Info;
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if (auto InfoOrErr = getOrCreateModuleInfo(ModuleName))
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Info = InfoOrErr.get();
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else
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return InfoOrErr.takeError();
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// A null module means an error has already been reported. Return an empty
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// result.
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if (!Info)
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return DIInliningInfo();
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// If the user is giving us relative addresses, add the preferred base of the
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// object to the offset before we do the query. It's what DIContext expects.
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if (Opts.RelativeAddresses)
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ModuleOffset += Info->getModulePreferredBase();
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DIInliningInfo InlinedContext = Info->symbolizeInlinedCode(
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ModuleOffset, Opts.PrintFunctions, Opts.UseSymbolTable);
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if (Opts.Demangle) {
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for (int i = 0, n = InlinedContext.getNumberOfFrames(); i < n; i++) {
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auto *Frame = InlinedContext.getMutableFrame(i);
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Frame->FunctionName = DemangleName(Frame->FunctionName, Info);
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}
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}
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return InlinedContext;
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}
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Expected<DIGlobal> LLVMSymbolizer::symbolizeData(const std::string &ModuleName,
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uint64_t ModuleOffset) {
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SymbolizableModule *Info;
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if (auto InfoOrErr = getOrCreateModuleInfo(ModuleName))
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Info = InfoOrErr.get();
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else
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return InfoOrErr.takeError();
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// A null module means an error has already been reported. Return an empty
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// result.
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if (!Info)
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return DIGlobal();
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// If the user is giving us relative addresses, add the preferred base of
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// the object to the offset before we do the query. It's what DIContext
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// expects.
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if (Opts.RelativeAddresses)
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ModuleOffset += Info->getModulePreferredBase();
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DIGlobal Global = Info->symbolizeData(ModuleOffset);
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if (Opts.Demangle)
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Global.Name = DemangleName(Global.Name, Info);
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return Global;
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}
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void LLVMSymbolizer::flush() {
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ObjectForUBPathAndArch.clear();
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BinaryForPath.clear();
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ObjectPairForPathArch.clear();
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Modules.clear();
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}
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namespace {
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// For Path="/path/to/foo" and Basename="foo" assume that debug info is in
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// /path/to/foo.dSYM/Contents/Resources/DWARF/foo.
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// For Path="/path/to/bar.dSYM" and Basename="foo" assume that debug info is in
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// /path/to/bar.dSYM/Contents/Resources/DWARF/foo.
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std::string getDarwinDWARFResourceForPath(
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const std::string &Path, const std::string &Basename) {
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SmallString<16> ResourceName = StringRef(Path);
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if (sys::path::extension(Path) != ".dSYM") {
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ResourceName += ".dSYM";
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}
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sys::path::append(ResourceName, "Contents", "Resources", "DWARF");
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sys::path::append(ResourceName, Basename);
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return ResourceName.str();
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}
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bool checkFileCRC(StringRef Path, uint32_t CRCHash) {
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ErrorOr<std::unique_ptr<MemoryBuffer>> MB =
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MemoryBuffer::getFileOrSTDIN(Path);
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if (!MB)
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return false;
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return !zlib::isAvailable() || CRCHash == zlib::crc32(MB.get()->getBuffer());
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}
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bool findDebugBinary(const std::string &OrigPath,
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const std::string &DebuglinkName, uint32_t CRCHash,
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std::string &Result) {
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std::string OrigRealPath = OrigPath;
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#if defined(HAVE_REALPATH)
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if (char *RP = realpath(OrigPath.c_str(), nullptr)) {
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OrigRealPath = RP;
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free(RP);
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}
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#endif
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SmallString<16> OrigDir(OrigRealPath);
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llvm::sys::path::remove_filename(OrigDir);
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SmallString<16> DebugPath = OrigDir;
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// Try /path/to/original_binary/debuglink_name
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llvm::sys::path::append(DebugPath, DebuglinkName);
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if (checkFileCRC(DebugPath, CRCHash)) {
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Result = DebugPath.str();
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return true;
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}
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// Try /path/to/original_binary/.debug/debuglink_name
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DebugPath = OrigRealPath;
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llvm::sys::path::append(DebugPath, ".debug", DebuglinkName);
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if (checkFileCRC(DebugPath, CRCHash)) {
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Result = DebugPath.str();
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return true;
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}
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// Try /usr/lib/debug/path/to/original_binary/debuglink_name
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DebugPath = "/usr/lib/debug";
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llvm::sys::path::append(DebugPath, llvm::sys::path::relative_path(OrigDir),
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DebuglinkName);
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if (checkFileCRC(DebugPath, CRCHash)) {
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Result = DebugPath.str();
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return true;
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}
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return false;
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}
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bool getGNUDebuglinkContents(const ObjectFile *Obj, std::string &DebugName,
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uint32_t &CRCHash) {
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if (!Obj)
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return false;
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for (const SectionRef &Section : Obj->sections()) {
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StringRef Name;
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Section.getName(Name);
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Name = Name.substr(Name.find_first_not_of("._"));
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if (Name == "gnu_debuglink") {
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StringRef Data;
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Section.getContents(Data);
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DataExtractor DE(Data, Obj->isLittleEndian(), 0);
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uint32_t Offset = 0;
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if (const char *DebugNameStr = DE.getCStr(&Offset)) {
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// 4-byte align the offset.
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Offset = (Offset + 3) & ~0x3;
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if (DE.isValidOffsetForDataOfSize(Offset, 4)) {
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DebugName = DebugNameStr;
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CRCHash = DE.getU32(&Offset);
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return true;
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}
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}
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break;
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}
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}
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return false;
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}
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bool darwinDsymMatchesBinary(const MachOObjectFile *DbgObj,
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const MachOObjectFile *Obj) {
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ArrayRef<uint8_t> dbg_uuid = DbgObj->getUuid();
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ArrayRef<uint8_t> bin_uuid = Obj->getUuid();
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if (dbg_uuid.empty() || bin_uuid.empty())
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return false;
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return !memcmp(dbg_uuid.data(), bin_uuid.data(), dbg_uuid.size());
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}
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} // end anonymous namespace
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ObjectFile *LLVMSymbolizer::lookUpDsymFile(const std::string &ExePath,
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const MachOObjectFile *MachExeObj, const std::string &ArchName) {
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// On Darwin we may find DWARF in separate object file in
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// resource directory.
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std::vector<std::string> DsymPaths;
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StringRef Filename = sys::path::filename(ExePath);
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DsymPaths.push_back(getDarwinDWARFResourceForPath(ExePath, Filename));
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for (const auto &Path : Opts.DsymHints) {
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DsymPaths.push_back(getDarwinDWARFResourceForPath(Path, Filename));
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}
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for (const auto &Path : DsymPaths) {
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auto DbgObjOrErr = getOrCreateObject(Path, ArchName);
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if (!DbgObjOrErr) {
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// Ignore errors, the file might not exist.
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consumeError(DbgObjOrErr.takeError());
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continue;
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}
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ObjectFile *DbgObj = DbgObjOrErr.get();
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if (!DbgObj)
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continue;
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const MachOObjectFile *MachDbgObj = dyn_cast<const MachOObjectFile>(DbgObj);
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if (!MachDbgObj)
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continue;
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if (darwinDsymMatchesBinary(MachDbgObj, MachExeObj))
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return DbgObj;
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}
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return nullptr;
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}
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ObjectFile *LLVMSymbolizer::lookUpDebuglinkObject(const std::string &Path,
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const ObjectFile *Obj,
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const std::string &ArchName) {
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std::string DebuglinkName;
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uint32_t CRCHash;
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std::string DebugBinaryPath;
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if (!getGNUDebuglinkContents(Obj, DebuglinkName, CRCHash))
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return nullptr;
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if (!findDebugBinary(Path, DebuglinkName, CRCHash, DebugBinaryPath))
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return nullptr;
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auto DbgObjOrErr = getOrCreateObject(DebugBinaryPath, ArchName);
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if (!DbgObjOrErr) {
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// Ignore errors, the file might not exist.
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consumeError(DbgObjOrErr.takeError());
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return nullptr;
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}
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return DbgObjOrErr.get();
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}
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Expected<LLVMSymbolizer::ObjectPair>
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LLVMSymbolizer::getOrCreateObjectPair(const std::string &Path,
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const std::string &ArchName) {
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const auto &I = ObjectPairForPathArch.find(std::make_pair(Path, ArchName));
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if (I != ObjectPairForPathArch.end()) {
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return I->second;
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}
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auto ObjOrErr = getOrCreateObject(Path, ArchName);
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if (!ObjOrErr) {
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ObjectPairForPathArch.insert(std::make_pair(std::make_pair(Path, ArchName),
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ObjectPair(nullptr, nullptr)));
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return ObjOrErr.takeError();
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}
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ObjectFile *Obj = ObjOrErr.get();
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assert(Obj != nullptr);
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ObjectFile *DbgObj = nullptr;
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if (auto MachObj = dyn_cast<const MachOObjectFile>(Obj))
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DbgObj = lookUpDsymFile(Path, MachObj, ArchName);
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if (!DbgObj)
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DbgObj = lookUpDebuglinkObject(Path, Obj, ArchName);
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if (!DbgObj)
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DbgObj = Obj;
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ObjectPair Res = std::make_pair(Obj, DbgObj);
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ObjectPairForPathArch.insert(
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std::make_pair(std::make_pair(Path, ArchName), Res));
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return Res;
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}
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Expected<ObjectFile *>
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LLVMSymbolizer::getOrCreateObject(const std::string &Path,
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const std::string &ArchName) {
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const auto &I = BinaryForPath.find(Path);
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Binary *Bin = nullptr;
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if (I == BinaryForPath.end()) {
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Expected<OwningBinary<Binary>> BinOrErr = createBinary(Path);
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if (!BinOrErr) {
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BinaryForPath.insert(std::make_pair(Path, OwningBinary<Binary>()));
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return BinOrErr.takeError();
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}
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Bin = BinOrErr->getBinary();
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BinaryForPath.insert(std::make_pair(Path, std::move(BinOrErr.get())));
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} else {
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Bin = I->second.getBinary();
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}
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if (!Bin)
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return static_cast<ObjectFile *>(nullptr);
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if (MachOUniversalBinary *UB = dyn_cast_or_null<MachOUniversalBinary>(Bin)) {
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const auto &I = ObjectForUBPathAndArch.find(std::make_pair(Path, ArchName));
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if (I != ObjectForUBPathAndArch.end()) {
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return I->second.get();
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}
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Expected<std::unique_ptr<ObjectFile>> ObjOrErr =
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UB->getObjectForArch(ArchName);
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if (!ObjOrErr) {
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ObjectForUBPathAndArch.insert(std::make_pair(
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std::make_pair(Path, ArchName), std::unique_ptr<ObjectFile>()));
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return ObjOrErr.takeError();
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}
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ObjectFile *Res = ObjOrErr->get();
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ObjectForUBPathAndArch.insert(std::make_pair(std::make_pair(Path, ArchName),
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std::move(ObjOrErr.get())));
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return Res;
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}
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if (Bin->isObject()) {
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return cast<ObjectFile>(Bin);
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}
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return errorCodeToError(object_error::arch_not_found);
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}
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Expected<SymbolizableModule *>
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LLVMSymbolizer::getOrCreateModuleInfo(const std::string &ModuleName) {
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const auto &I = Modules.find(ModuleName);
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if (I != Modules.end()) {
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return I->second.get();
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}
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std::string BinaryName = ModuleName;
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std::string ArchName = Opts.DefaultArch;
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size_t ColonPos = ModuleName.find_last_of(':');
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// Verify that substring after colon form a valid arch name.
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if (ColonPos != std::string::npos) {
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std::string ArchStr = ModuleName.substr(ColonPos + 1);
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if (Triple(ArchStr).getArch() != Triple::UnknownArch) {
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BinaryName = ModuleName.substr(0, ColonPos);
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ArchName = ArchStr;
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}
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}
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auto ObjectsOrErr = getOrCreateObjectPair(BinaryName, ArchName);
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if (!ObjectsOrErr) {
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// Failed to find valid object file.
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Modules.insert(
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std::make_pair(ModuleName, std::unique_ptr<SymbolizableModule>()));
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return ObjectsOrErr.takeError();
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}
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ObjectPair Objects = ObjectsOrErr.get();
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std::unique_ptr<DIContext> Context;
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// If this is a COFF object containing PDB info, use a PDBContext to
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// symbolize. Otherwise, use DWARF.
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if (auto CoffObject = dyn_cast<COFFObjectFile>(Objects.first)) {
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const debug_pdb_info *PDBInfo;
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StringRef PDBFileName;
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auto EC = CoffObject->getDebugPDBInfo(PDBInfo, PDBFileName);
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if (!EC && PDBInfo != nullptr) {
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using namespace pdb;
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std::unique_ptr<IPDBSession> Session;
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if (auto Err = loadDataForEXE(PDB_ReaderType::DIA,
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Objects.first->getFileName(), Session)) {
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Modules.insert(
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std::make_pair(ModuleName, std::unique_ptr<SymbolizableModule>()));
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return std::move(Err);
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}
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Context.reset(new PDBContext(*CoffObject, std::move(Session)));
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}
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}
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if (!Context)
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Context.reset(new DWARFContextInMemory(*Objects.second));
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assert(Context);
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auto InfoOrErr =
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SymbolizableObjectFile::create(Objects.first, std::move(Context));
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std::unique_ptr<SymbolizableModule> SymMod;
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if (InfoOrErr)
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SymMod = std::move(InfoOrErr.get());
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auto InsertResult =
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Modules.insert(std::make_pair(ModuleName, std::move(SymMod)));
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assert(InsertResult.second);
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if (auto EC = InfoOrErr.getError())
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return errorCodeToError(EC);
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return InsertResult.first->second.get();
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}
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namespace {
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// Undo these various manglings for Win32 extern "C" functions:
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// cdecl - _foo
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// stdcall - _foo@12
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// fastcall - @foo@12
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// vectorcall - foo@@12
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// These are all different linkage names for 'foo'.
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StringRef demanglePE32ExternCFunc(StringRef SymbolName) {
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// Remove any '_' or '@' prefix.
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char Front = SymbolName.empty() ? '\0' : SymbolName[0];
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if (Front == '_' || Front == '@')
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SymbolName = SymbolName.drop_front();
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// Remove any '@[0-9]+' suffix.
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if (Front != '?') {
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size_t AtPos = SymbolName.rfind('@');
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if (AtPos != StringRef::npos &&
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std::all_of(SymbolName.begin() + AtPos + 1, SymbolName.end(),
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[](char C) { return C >= '0' && C <= '9'; })) {
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SymbolName = SymbolName.substr(0, AtPos);
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}
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}
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// Remove any ending '@' for vectorcall.
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if (SymbolName.endswith("@"))
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SymbolName = SymbolName.drop_back();
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return SymbolName;
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}
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} // end anonymous namespace
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#if !defined(_MSC_VER)
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// Assume that __cxa_demangle is provided by libcxxabi (except for Windows).
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extern "C" char *__cxa_demangle(const char *mangled_name, char *output_buffer,
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size_t *length, int *status);
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#endif
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std::string LLVMSymbolizer::DemangleName(const std::string &Name,
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const SymbolizableModule *ModInfo) {
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#if !defined(_MSC_VER)
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// We can spoil names of symbols with C linkage, so use an heuristic
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// approach to check if the name should be demangled.
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if (Name.substr(0, 2) == "_Z") {
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int status = 0;
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char *DemangledName = __cxa_demangle(Name.c_str(), nullptr, nullptr, &status);
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if (status != 0)
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return Name;
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std::string Result = DemangledName;
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free(DemangledName);
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return Result;
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}
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#else
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if (!Name.empty() && Name.front() == '?') {
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// Only do MSVC C++ demangling on symbols starting with '?'.
|
|
char DemangledName[1024] = {0};
|
|
DWORD result = ::UnDecorateSymbolName(
|
|
Name.c_str(), DemangledName, 1023,
|
|
UNDNAME_NO_ACCESS_SPECIFIERS | // Strip public, private, protected
|
|
UNDNAME_NO_ALLOCATION_LANGUAGE | // Strip __thiscall, __stdcall, etc
|
|
UNDNAME_NO_THROW_SIGNATURES | // Strip throw() specifications
|
|
UNDNAME_NO_MEMBER_TYPE | // Strip virtual, static, etc specifiers
|
|
UNDNAME_NO_MS_KEYWORDS | // Strip all MS extension keywords
|
|
UNDNAME_NO_FUNCTION_RETURNS); // Strip function return types
|
|
return (result == 0) ? Name : std::string(DemangledName);
|
|
}
|
|
#endif
|
|
if (ModInfo && ModInfo->isWin32Module())
|
|
return std::string(demanglePE32ExternCFunc(Name));
|
|
return Name;
|
|
}
|
|
|
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} // namespace symbolize
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} // namespace llvm
|