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8228a8dd91
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189250 91177308-0d34-0410-b5e6-96231b3b80d8
441 lines
15 KiB
C++
441 lines
15 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/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/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(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 uint32_t
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getDILineInfoSpecifierFlags(const LLVMSymbolizer::Options &Opts) {
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uint32_t Flags = llvm::DILineInfoSpecifier::FileLineInfo |
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llvm::DILineInfoSpecifier::AbsoluteFilePath;
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if (Opts.PrintFunctions)
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Flags |= llvm::DILineInfoSpecifier::FunctionName;
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return Flags;
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}
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static void patchFunctionNameInDILineInfo(const std::string &NewFunctionName,
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DILineInfo &LineInfo) {
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std::string FileName = LineInfo.getFileName();
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LineInfo = DILineInfo(StringRef(FileName), StringRef(NewFunctionName),
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LineInfo.getLine(), LineInfo.getColumn());
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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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error_code ec;
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for (symbol_iterator si = Module->begin_symbols(), se = Module->end_symbols();
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si != se; si.increment(ec)) {
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if (error(ec))
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return;
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SymbolRef::Type SymbolType;
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if (error(si->getType(SymbolType)))
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continue;
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if (SymbolType != SymbolRef::ST_Function &&
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SymbolType != SymbolRef::ST_Data)
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continue;
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uint64_t SymbolAddress;
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if (error(si->getAddress(SymbolAddress)) ||
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SymbolAddress == UnknownAddressOrSize)
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continue;
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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>(Obj))
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SymbolSize = 0;
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else if (error(si->getSize(SymbolSize)) ||
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SymbolSize == UnknownAddressOrSize)
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continue;
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StringRef SymbolName;
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if (error(si->getName(SymbolName)))
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continue;
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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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SymbolMapTy &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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}
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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 SymbolMapTy &M = Type == SymbolRef::ST_Function ? Functions : Objects;
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if (M.empty())
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return false;
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SymbolDesc SD = { Address, Address };
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SymbolMapTy::const_iterator it = M.upper_bound(SD);
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if (it == M.begin())
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return false;
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--it;
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if (it->first.Size != 0 && it->first.Addr + it->first.Size <= Address)
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return false;
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Name = it->second.str();
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Addr = it->first.Addr;
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Size = it->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, getDILineInfoSpecifierFlags(Opts));
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}
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// Override function name from symbol table if necessary.
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if (Opts.PrintFunctions && 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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patchFunctionNameInDILineInfo(FunctionName, LineInfo);
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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, getDILineInfoSpecifierFlags(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 && 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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patchFunctionNameInDILineInfo(FunctionName, LineInfo);
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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 == 0)
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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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DeleteContainerPointers(ParsedBinariesAndObjects);
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BinaryForPath.clear();
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ObjectFileForArch.clear();
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}
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static std::string getDarwinDWARFResourceForPath(const std::string &Path) {
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StringRef Basename = sys::path::filename(Path);
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const std::string &DSymDirectory = Path + ".dSYM";
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SmallString<16> ResourceName = StringRef(DSymDirectory);
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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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OwningPtr<MemoryBuffer> MB;
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if (MemoryBuffer::getFileOrSTDIN(Path, MB))
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return false;
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return !zlib::isAvailable() || CRCHash == zlib::crc32(MB->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(), NULL)) {
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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 Binary *Bin, std::string &DebugName,
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uint32_t &CRCHash) {
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const ObjectFile *Obj = dyn_cast<ObjectFile>(Bin);
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if (!Obj)
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return false;
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error_code EC;
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for (section_iterator I = Obj->begin_sections(), E = Obj->end_sections();
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I != E; I.increment(EC)) {
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StringRef Name;
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I->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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I->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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LLVMSymbolizer::BinaryPair
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LLVMSymbolizer::getOrCreateBinary(const std::string &Path) {
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BinaryMapTy::iterator I = BinaryForPath.find(Path);
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if (I != BinaryForPath.end())
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return I->second;
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Binary *Bin = 0;
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Binary *DbgBin = 0;
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OwningPtr<Binary> ParsedBinary;
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OwningPtr<Binary> ParsedDbgBinary;
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if (!error(createBinary(Path, ParsedBinary))) {
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// Check if it's a universal binary.
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Bin = ParsedBinary.take();
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ParsedBinariesAndObjects.push_back(Bin);
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if (Bin->isMachO() || Bin->isMachOUniversalBinary()) {
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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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const std::string &ResourcePath =
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getDarwinDWARFResourceForPath(Path);
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bool ResourceFileExists = false;
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if (!sys::fs::exists(ResourcePath, ResourceFileExists) &&
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ResourceFileExists &&
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!error(createBinary(ResourcePath, ParsedDbgBinary))) {
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DbgBin = ParsedDbgBinary.take();
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ParsedBinariesAndObjects.push_back(DbgBin);
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}
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}
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// Try to locate the debug binary using .gnu_debuglink section.
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if (DbgBin == 0) {
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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(Bin, DebuglinkName, CRCHash) &&
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findDebugBinary(Path, DebuglinkName, CRCHash, DebugBinaryPath) &&
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!error(createBinary(DebugBinaryPath, ParsedDbgBinary))) {
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DbgBin = ParsedDbgBinary.take();
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ParsedBinariesAndObjects.push_back(DbgBin);
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}
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}
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}
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if (DbgBin == 0)
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DbgBin = Bin;
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BinaryPair Res = std::make_pair(Bin, DbgBin);
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BinaryForPath[Path] = Res;
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return Res;
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}
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ObjectFile *
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LLVMSymbolizer::getObjectFileFromBinary(Binary *Bin, const std::string &ArchName) {
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if (Bin == 0)
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return 0;
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ObjectFile *Res = 0;
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if (MachOUniversalBinary *UB = dyn_cast<MachOUniversalBinary>(Bin)) {
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ObjectFileForArchMapTy::iterator 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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OwningPtr<ObjectFile> ParsedObj;
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if (!UB->getObjectForArch(Triple(ArchName).getArch(), ParsedObj)) {
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Res = ParsedObj.take();
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ParsedBinariesAndObjects.push_back(Res);
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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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ModuleMapTy::iterator 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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BinaryPair Binaries = getOrCreateBinary(BinaryName);
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ObjectFile *Obj = getObjectFileFromBinary(Binaries.first, ArchName);
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ObjectFile *DbgObj = getObjectFileFromBinary(Binaries.second, ArchName);
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if (Obj == 0) {
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// Failed to find valid object file.
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Modules.insert(make_pair(ModuleName, (ModuleInfo *)0));
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return 0;
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}
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DIContext *Context = DIContext::getDWARFContext(DbgObj);
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assert(Context);
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ModuleInfo *Info = new ModuleInfo(Obj, 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) {
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std::string FunctionName = LineInfo.getFunctionName();
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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.getFileName();
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if (Filename == kDILineInfoBadString)
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Filename = kBadString;
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Result << Filename << ":" << LineInfo.getLine() << ":" << LineInfo.getColumn()
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<< "\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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int status = 0;
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char *DemangledName = __cxa_demangle(Name.c_str(), 0, 0, &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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