mirror of
https://github.com/RPCSX/llvm.git
synced 2024-11-24 20:29:53 +00:00
7b8ba81502
The getBinary and getBuffer method now return ordinary pointers of appropriate const-ness. Ownership is transferred by calling takeBinary(), which returns a pair of the Binary and a MemoryBuffer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221003 91177308-0d34-0410-b5e6-96231b3b80d8
485 lines
17 KiB
C++
485 lines
17 KiB
C++
//===-- 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 "LLVMSymbolize.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/Object/ELFObjectFile.h"
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#include "llvm/Object/MachO.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 <sstream>
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#include <stdlib.h>
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namespace llvm {
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namespace symbolize {
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static bool error(std::error_code ec) {
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if (!ec)
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return false;
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errs() << "LLVMSymbolizer: error reading file: " << ec.message() << ".\n";
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return true;
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}
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static DILineInfoSpecifier
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getDILineInfoSpecifier(const LLVMSymbolizer::Options &Opts) {
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return DILineInfoSpecifier(
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DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath,
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Opts.PrintFunctions);
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}
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ModuleInfo::ModuleInfo(ObjectFile *Obj, DIContext *DICtx)
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: Module(Obj), DebugInfoContext(DICtx) {
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for (const SymbolRef &Symbol : Module->symbols()) {
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addSymbol(Symbol);
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}
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bool NoSymbolTable = (Module->symbol_begin() == Module->symbol_end());
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if (NoSymbolTable && Module->isELF()) {
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// Fallback to dynamic symbol table, if regular symbol table is stripped.
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std::pair<symbol_iterator, symbol_iterator> IDyn =
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getELFDynamicSymbolIterators(Module);
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for (symbol_iterator si = IDyn.first, se = IDyn.second; si != se; ++si) {
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addSymbol(*si);
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}
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}
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}
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void ModuleInfo::addSymbol(const SymbolRef &Symbol) {
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SymbolRef::Type SymbolType;
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if (error(Symbol.getType(SymbolType)))
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return;
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if (SymbolType != SymbolRef::ST_Function && SymbolType != SymbolRef::ST_Data)
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return;
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uint64_t SymbolAddress;
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if (error(Symbol.getAddress(SymbolAddress)) ||
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SymbolAddress == UnknownAddressOrSize)
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return;
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uint64_t SymbolSize;
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// Getting symbol size is linear for Mach-O files, so assume that symbol
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// occupies the memory range up to the following symbol.
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if (isa<MachOObjectFile>(Module))
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SymbolSize = 0;
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else if (error(Symbol.getSize(SymbolSize)) ||
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SymbolSize == UnknownAddressOrSize)
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return;
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StringRef SymbolName;
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if (error(Symbol.getName(SymbolName)))
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return;
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// Mach-O symbol table names have leading underscore, skip it.
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if (Module->isMachO() && SymbolName.size() > 0 && SymbolName[0] == '_')
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SymbolName = SymbolName.drop_front();
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// FIXME: If a function has alias, there are two entries in symbol table
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// with same address size. Make sure we choose the correct one.
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auto &M = SymbolType == SymbolRef::ST_Function ? Functions : Objects;
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SymbolDesc SD = { SymbolAddress, SymbolSize };
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M.insert(std::make_pair(SD, SymbolName));
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}
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bool ModuleInfo::getNameFromSymbolTable(SymbolRef::Type Type, uint64_t Address,
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std::string &Name, uint64_t &Addr,
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uint64_t &Size) const {
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const auto &SymbolMap = Type == SymbolRef::ST_Function ? Functions : Objects;
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if (SymbolMap.empty())
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return false;
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SymbolDesc SD = { Address, Address };
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auto SymbolIterator = SymbolMap.upper_bound(SD);
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if (SymbolIterator == SymbolMap.begin())
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return false;
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--SymbolIterator;
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if (SymbolIterator->first.Size != 0 &&
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SymbolIterator->first.Addr + SymbolIterator->first.Size <= Address)
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return false;
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Name = SymbolIterator->second.str();
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Addr = SymbolIterator->first.Addr;
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Size = SymbolIterator->first.Size;
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return true;
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}
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DILineInfo ModuleInfo::symbolizeCode(
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uint64_t ModuleOffset, const LLVMSymbolizer::Options &Opts) const {
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DILineInfo LineInfo;
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if (DebugInfoContext) {
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LineInfo = DebugInfoContext->getLineInfoForAddress(
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ModuleOffset, getDILineInfoSpecifier(Opts));
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}
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// Override function name from symbol table if necessary.
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if (Opts.PrintFunctions != FunctionNameKind::None && Opts.UseSymbolTable) {
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std::string FunctionName;
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uint64_t Start, Size;
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if (getNameFromSymbolTable(SymbolRef::ST_Function, ModuleOffset,
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FunctionName, Start, Size)) {
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LineInfo.FunctionName = FunctionName;
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}
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}
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return LineInfo;
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}
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DIInliningInfo ModuleInfo::symbolizeInlinedCode(
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uint64_t ModuleOffset, const LLVMSymbolizer::Options &Opts) const {
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DIInliningInfo InlinedContext;
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if (DebugInfoContext) {
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InlinedContext = DebugInfoContext->getInliningInfoForAddress(
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ModuleOffset, getDILineInfoSpecifier(Opts));
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}
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// Make sure there is at least one frame in context.
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if (InlinedContext.getNumberOfFrames() == 0) {
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InlinedContext.addFrame(DILineInfo());
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}
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// Override the function name in lower frame with name from symbol table.
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if (Opts.PrintFunctions != FunctionNameKind::None && Opts.UseSymbolTable) {
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DIInliningInfo PatchedInlinedContext;
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for (uint32_t i = 0, n = InlinedContext.getNumberOfFrames(); i < n; i++) {
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DILineInfo LineInfo = InlinedContext.getFrame(i);
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if (i == n - 1) {
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std::string FunctionName;
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uint64_t Start, Size;
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if (getNameFromSymbolTable(SymbolRef::ST_Function, ModuleOffset,
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FunctionName, Start, Size)) {
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LineInfo.FunctionName = FunctionName;
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}
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}
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PatchedInlinedContext.addFrame(LineInfo);
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}
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InlinedContext = PatchedInlinedContext;
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}
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return InlinedContext;
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}
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bool ModuleInfo::symbolizeData(uint64_t ModuleOffset, std::string &Name,
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uint64_t &Start, uint64_t &Size) const {
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return getNameFromSymbolTable(SymbolRef::ST_Data, ModuleOffset, Name, Start,
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Size);
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}
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const char LLVMSymbolizer::kBadString[] = "??";
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std::string LLVMSymbolizer::symbolizeCode(const std::string &ModuleName,
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uint64_t ModuleOffset) {
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ModuleInfo *Info = getOrCreateModuleInfo(ModuleName);
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if (!Info)
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return printDILineInfo(DILineInfo());
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if (Opts.PrintInlining) {
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DIInliningInfo InlinedContext =
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Info->symbolizeInlinedCode(ModuleOffset, Opts);
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uint32_t FramesNum = InlinedContext.getNumberOfFrames();
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assert(FramesNum > 0);
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std::string Result;
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for (uint32_t i = 0; i < FramesNum; i++) {
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DILineInfo LineInfo = InlinedContext.getFrame(i);
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Result += printDILineInfo(LineInfo);
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}
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return Result;
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}
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DILineInfo LineInfo = Info->symbolizeCode(ModuleOffset, Opts);
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return printDILineInfo(LineInfo);
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}
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std::string LLVMSymbolizer::symbolizeData(const std::string &ModuleName,
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uint64_t ModuleOffset) {
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std::string Name = kBadString;
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uint64_t Start = 0;
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uint64_t Size = 0;
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if (Opts.UseSymbolTable) {
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if (ModuleInfo *Info = getOrCreateModuleInfo(ModuleName)) {
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if (Info->symbolizeData(ModuleOffset, Name, Start, Size) && Opts.Demangle)
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Name = DemangleName(Name);
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}
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}
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std::stringstream ss;
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ss << Name << "\n" << Start << " " << Size << "\n";
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return ss.str();
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}
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void LLVMSymbolizer::flush() {
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DeleteContainerSeconds(Modules);
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ObjectPairForPathArch.clear();
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ObjectFileForArch.clear();
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}
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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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static
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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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static 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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static 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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static 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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static
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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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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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ErrorOr<OwningBinary<Binary>> BinaryOrErr = createBinary(path);
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std::error_code EC = BinaryOrErr.getError();
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if (EC != errc::no_such_file_or_directory && !error(EC)) {
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OwningBinary<Binary> B = std::move(BinaryOrErr.get());
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ObjectFile *DbgObj =
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getObjectFileFromBinary(B.getBinary(), ArchName);
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const MachOObjectFile *MachDbgObj =
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dyn_cast<const MachOObjectFile>(DbgObj);
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if (!MachDbgObj) continue;
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if (darwinDsymMatchesBinary(MachDbgObj, MachExeObj)) {
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addOwningBinary(std::move(B));
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return DbgObj;
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}
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}
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}
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return nullptr;
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}
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LLVMSymbolizer::ObjectPair
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LLVMSymbolizer::getOrCreateObjects(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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ObjectFile *Obj = nullptr;
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ObjectFile *DbgObj = nullptr;
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ErrorOr<OwningBinary<Binary>> BinaryOrErr = createBinary(Path);
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if (!error(BinaryOrErr.getError())) {
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OwningBinary<Binary> &B = BinaryOrErr.get();
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Obj = getObjectFileFromBinary(B.getBinary(), ArchName);
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if (!Obj) {
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ObjectPair Res = std::make_pair(nullptr, nullptr);
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ObjectPairForPathArch[std::make_pair(Path, ArchName)] = Res;
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return Res;
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}
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addOwningBinary(std::move(B));
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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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// Try to locate the debug binary using .gnu_debuglink section.
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if (!DbgObj) {
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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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findDebugBinary(Path, DebuglinkName, CRCHash, DebugBinaryPath)) {
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BinaryOrErr = createBinary(DebugBinaryPath);
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if (!error(BinaryOrErr.getError())) {
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OwningBinary<Binary> B = std::move(BinaryOrErr.get());
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DbgObj = getObjectFileFromBinary(B.getBinary(), ArchName);
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addOwningBinary(std::move(B));
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}
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}
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}
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}
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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[std::make_pair(Path, ArchName)] = Res;
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return Res;
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}
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ObjectFile *
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LLVMSymbolizer::getObjectFileFromBinary(Binary *Bin,
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const std::string &ArchName) {
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if (!Bin)
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return nullptr;
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ObjectFile *Res = nullptr;
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if (MachOUniversalBinary *UB = dyn_cast<MachOUniversalBinary>(Bin)) {
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const auto &I = ObjectFileForArch.find(
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std::make_pair(UB, ArchName));
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if (I != ObjectFileForArch.end())
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return I->second;
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ErrorOr<std::unique_ptr<ObjectFile>> ParsedObj =
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UB->getObjectForArch(Triple(ArchName).getArch());
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if (ParsedObj) {
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Res = ParsedObj.get().get();
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ParsedBinariesAndObjects.push_back(std::move(ParsedObj.get()));
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}
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ObjectFileForArch[std::make_pair(UB, ArchName)] = Res;
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} else if (Bin->isObject()) {
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Res = cast<ObjectFile>(Bin);
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}
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return Res;
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}
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ModuleInfo *
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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;
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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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ObjectPair Objects = getOrCreateObjects(BinaryName, ArchName);
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if (!Objects.first) {
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// Failed to find valid object file.
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Modules.insert(make_pair(ModuleName, (ModuleInfo *)nullptr));
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return nullptr;
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}
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DIContext *Context = DIContext::getDWARFContext(*Objects.second);
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assert(Context);
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ModuleInfo *Info = new ModuleInfo(Objects.first, Context);
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Modules.insert(make_pair(ModuleName, Info));
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return Info;
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}
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std::string LLVMSymbolizer::printDILineInfo(DILineInfo LineInfo) const {
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// By default, DILineInfo contains "<invalid>" for function/filename it
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// cannot fetch. We replace it to "??" to make our output closer to addr2line.
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static const std::string kDILineInfoBadString = "<invalid>";
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std::stringstream Result;
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if (Opts.PrintFunctions != FunctionNameKind::None) {
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std::string FunctionName = LineInfo.FunctionName;
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if (FunctionName == kDILineInfoBadString)
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FunctionName = kBadString;
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else if (Opts.Demangle)
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FunctionName = DemangleName(FunctionName);
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Result << FunctionName << "\n";
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}
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std::string Filename = LineInfo.FileName;
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if (Filename == kDILineInfoBadString)
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Filename = kBadString;
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Result << Filename << ":" << LineInfo.Line << ":" << LineInfo.Column << "\n";
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return Result.str();
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}
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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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#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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return Name;
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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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#else
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return Name;
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#endif
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}
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} // namespace symbolize
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} // namespace llvm
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