2013-01-22 22:21:19 +08:00
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//===-- 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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2013-03-19 23:33:18 +08:00
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#include "llvm/ADT/STLExtras.h"
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2013-08-27 02:12:03 +08:00
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#include "llvm/Config/config.h"
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2014-02-26 21:10:01 +08:00
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#include "llvm/Object/ELFObjectFile.h"
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2013-01-22 22:21:19 +08:00
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#include "llvm/Object/MachO.h"
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#include "llvm/Support/Casting.h"
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2013-08-15 01:09:30 +08:00
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#include "llvm/Support/Compression.h"
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#include "llvm/Support/DataExtractor.h"
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2013-06-04 15:57:38 +08:00
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#include "llvm/Support/FileSystem.h"
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2013-08-15 01:09:30 +08:00
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#include "llvm/Support/MemoryBuffer.h"
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2013-01-22 22:21:19 +08:00
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#include "llvm/Support/Path.h"
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#include <sstream>
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2013-08-27 02:12:03 +08:00
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#include <stdlib.h>
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2013-01-22 22:21:19 +08:00
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namespace llvm {
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namespace symbolize {
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2013-02-14 21:06:18 +08:00
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static bool error(error_code ec) {
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2013-02-15 16:54:47 +08:00
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if (!ec)
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return false;
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2013-02-14 21:06:18 +08:00
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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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2013-02-15 16:54:47 +08:00
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static uint32_t
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getDILineInfoSpecifierFlags(const LLVMSymbolizer::Options &Opts) {
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2013-01-22 22:21:19 +08:00
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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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2013-02-14 21:06:18 +08:00
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ModuleInfo::ModuleInfo(ObjectFile *Obj, DIContext *DICtx)
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2013-02-15 16:54:47 +08:00
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: Module(Obj), DebugInfoContext(DICtx) {
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2014-02-11 04:24:04 +08:00
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for (symbol_iterator si = Module->symbol_begin(), se = Module->symbol_end();
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2014-01-30 10:49:50 +08:00
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si != se; ++si) {
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2014-02-26 21:10:01 +08:00
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addSymbol(si);
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2013-02-14 21:06:18 +08:00
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}
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2014-02-26 21:10:01 +08:00
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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 symbol_iterator &Sym) {
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SymbolRef::Type SymbolType;
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if (error(Sym->getType(SymbolType)))
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return;
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if (SymbolType != SymbolRef::ST_Function &&
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SymbolType != SymbolRef::ST_Data)
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return;
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uint64_t SymbolAddress;
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if (error(Sym->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(Sym->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(Sym->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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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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2013-02-14 21:06:18 +08:00
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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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2013-02-15 16:54:47 +08:00
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const SymbolMapTy &M = Type == SymbolRef::ST_Function ? Functions : Objects;
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2013-06-04 15:57:38 +08:00
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if (M.empty())
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2013-02-14 21:06:18 +08:00
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return false;
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2013-06-04 15:57:38 +08:00
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SymbolDesc SD = { Address, Address };
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SymbolMapTy::const_iterator it = M.upper_bound(SD);
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2013-06-07 23:25:27 +08:00
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if (it == M.begin())
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return false;
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2013-06-04 15:57:38 +08:00
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--it;
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2013-06-07 23:25:27 +08:00
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if (it->first.Size != 0 && it->first.Addr + it->first.Size <= Address)
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2013-02-14 21:06:18 +08:00
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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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2013-06-07 23:25:27 +08:00
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Size = it->first.Size;
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2013-02-14 21:06:18 +08:00
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return true;
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}
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2013-02-15 16:54:47 +08:00
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DILineInfo ModuleInfo::symbolizeCode(
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uint64_t ModuleOffset, const LLVMSymbolizer::Options &Opts) const {
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2013-01-22 22:21:19 +08:00
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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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2013-02-15 16:54:47 +08:00
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if (getNameFromSymbolTable(SymbolRef::ST_Function, ModuleOffset,
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FunctionName, Start, Size)) {
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2013-01-22 22:21:19 +08:00
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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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2013-02-15 16:54:47 +08:00
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DIInliningInfo ModuleInfo::symbolizeInlinedCode(
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uint64_t ModuleOffset, const LLVMSymbolizer::Options &Opts) const {
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2013-01-22 22:21:19 +08:00
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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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2013-02-15 16:54:47 +08:00
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for (uint32_t i = 0, n = InlinedContext.getNumberOfFrames(); i < n; i++) {
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2013-01-22 22:21:19 +08:00
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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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2013-02-15 16:54:47 +08:00
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if (getNameFromSymbolTable(SymbolRef::ST_Function, ModuleOffset,
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FunctionName, Start, Size)) {
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2013-01-22 22:21:19 +08:00
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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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2013-02-15 16:54:47 +08:00
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return getNameFromSymbolTable(SymbolRef::ST_Data, ModuleOffset, Name, Start,
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Size);
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2013-01-22 22:21:19 +08:00
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}
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2013-02-04 23:55:26 +08:00
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const char LLVMSymbolizer::kBadString[] = "??";
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2013-01-22 22:21:19 +08:00
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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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2013-02-15 16:54:47 +08:00
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DIInliningInfo InlinedContext =
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Info->symbolizeInlinedCode(ModuleOffset, Opts);
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2013-01-22 22:21:19 +08:00
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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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2013-06-28 20:06:25 +08:00
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if (Info->symbolizeData(ModuleOffset, Name, Start, Size) && Opts.Demangle)
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2014-01-17 01:25:12 +08:00
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Name = DemangleName(Name);
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2013-01-22 22:21:19 +08:00
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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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2013-03-19 18:24:42 +08:00
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void LLVMSymbolizer::flush() {
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2013-03-19 23:33:18 +08:00
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DeleteContainerSeconds(Modules);
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2013-06-28 16:15:40 +08:00
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DeleteContainerPointers(ParsedBinariesAndObjects);
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2013-06-28 23:08:29 +08:00
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BinaryForPath.clear();
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ObjectFileForArch.clear();
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2013-03-19 18:24:42 +08:00
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}
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2013-06-28 16:15:40 +08:00
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static std::string getDarwinDWARFResourceForPath(const std::string &Path) {
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2013-01-22 22:21:19 +08:00
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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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2013-08-15 01:09:30 +08:00
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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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2013-08-27 02:12:03 +08:00
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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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2013-08-15 01:09:30 +08:00
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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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2013-08-27 02:12:03 +08:00
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DebugPath = OrigRealPath;
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2013-08-15 01:09:30 +08:00
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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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2014-02-11 04:24:04 +08:00
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for (section_iterator I = Obj->section_begin(), E = Obj->section_end();
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2014-01-30 10:49:50 +08:00
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I != E; ++I) {
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2013-08-15 01:09:30 +08:00
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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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2013-06-28 16:15:40 +08:00
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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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2014-01-16 03:37:43 +08:00
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|
ErrorOr<Binary *> BinaryOrErr = createBinary(Path);
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|
if (!error(BinaryOrErr.getError())) {
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OwningPtr<Binary> ParsedBinary(BinaryOrErr.get());
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2013-06-28 16:15:40 +08:00
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// Check if it's a universal binary.
|
2014-03-05 18:19:29 +08:00
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Bin = ParsedBinary.release();
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2013-06-28 16:15:40 +08:00
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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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2014-01-16 03:37:43 +08:00
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BinaryOrErr = createBinary(ResourcePath);
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|
error_code EC = BinaryOrErr.getError();
|
2014-01-15 12:49:50 +08:00
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if (EC != errc::no_such_file_or_directory && !error(EC)) {
|
2014-01-16 03:37:43 +08:00
|
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|
DbgBin = BinaryOrErr.get();
|
2013-06-28 16:15:40 +08:00
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|
ParsedBinariesAndObjects.push_back(DbgBin);
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}
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}
|
2013-08-15 01:09:30 +08:00
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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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|
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if (getGNUDebuglinkContents(Bin, DebuglinkName, CRCHash) &&
|
2014-01-16 03:37:43 +08:00
|
|
|
findDebugBinary(Path, DebuglinkName, CRCHash, DebugBinaryPath)) {
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|
BinaryOrErr = createBinary(DebugBinaryPath);
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|
|
if (!error(BinaryOrErr.getError())) {
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|
DbgBin = BinaryOrErr.get();
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|
ParsedBinariesAndObjects.push_back(DbgBin);
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|
}
|
2013-08-15 01:09:30 +08:00
|
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|
}
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|
}
|
2013-06-28 16:15:40 +08:00
|
|
|
}
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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(
|
|
|
|
std::make_pair(UB, ArchName));
|
|
|
|
if (I != ObjectFileForArch.end())
|
|
|
|
return I->second;
|
|
|
|
OwningPtr<ObjectFile> ParsedObj;
|
|
|
|
if (!UB->getObjectForArch(Triple(ArchName).getArch(), ParsedObj)) {
|
2014-03-05 18:19:29 +08:00
|
|
|
Res = ParsedObj.release();
|
2013-06-28 16:15:40 +08:00
|
|
|
ParsedBinariesAndObjects.push_back(Res);
|
|
|
|
}
|
|
|
|
ObjectFileForArch[std::make_pair(UB, ArchName)] = Res;
|
|
|
|
} else if (Bin->isObject()) {
|
|
|
|
Res = cast<ObjectFile>(Bin);
|
|
|
|
}
|
|
|
|
return Res;
|
|
|
|
}
|
|
|
|
|
2013-02-15 16:54:47 +08:00
|
|
|
ModuleInfo *
|
|
|
|
LLVMSymbolizer::getOrCreateModuleInfo(const std::string &ModuleName) {
|
2013-01-22 22:21:19 +08:00
|
|
|
ModuleMapTy::iterator I = Modules.find(ModuleName);
|
|
|
|
if (I != Modules.end())
|
|
|
|
return I->second;
|
2013-06-28 16:15:40 +08:00
|
|
|
std::string BinaryName = ModuleName;
|
|
|
|
std::string ArchName = Opts.DefaultArch;
|
2013-07-17 14:45:36 +08:00
|
|
|
size_t ColonPos = ModuleName.find_last_of(':');
|
|
|
|
// Verify that substring after colon form a valid arch name.
|
2013-06-28 16:15:40 +08:00
|
|
|
if (ColonPos != std::string::npos) {
|
2013-07-17 14:45:36 +08:00
|
|
|
std::string ArchStr = ModuleName.substr(ColonPos + 1);
|
2013-07-17 14:53:51 +08:00
|
|
|
if (Triple(ArchStr).getArch() != Triple::UnknownArch) {
|
2013-07-17 14:45:36 +08:00
|
|
|
BinaryName = ModuleName.substr(0, ColonPos);
|
|
|
|
ArchName = ArchStr;
|
|
|
|
}
|
2013-06-28 16:15:40 +08:00
|
|
|
}
|
|
|
|
BinaryPair Binaries = getOrCreateBinary(BinaryName);
|
|
|
|
ObjectFile *Obj = getObjectFileFromBinary(Binaries.first, ArchName);
|
|
|
|
ObjectFile *DbgObj = getObjectFileFromBinary(Binaries.second, ArchName);
|
2013-01-22 22:21:19 +08:00
|
|
|
|
|
|
|
if (Obj == 0) {
|
2013-06-28 16:15:40 +08:00
|
|
|
// Failed to find valid object file.
|
2013-02-15 16:54:47 +08:00
|
|
|
Modules.insert(make_pair(ModuleName, (ModuleInfo *)0));
|
2013-01-22 22:21:19 +08:00
|
|
|
return 0;
|
|
|
|
}
|
2013-06-28 16:15:40 +08:00
|
|
|
DIContext *Context = DIContext::getDWARFContext(DbgObj);
|
|
|
|
assert(Context);
|
2013-01-22 22:21:19 +08:00
|
|
|
ModuleInfo *Info = new ModuleInfo(Obj, Context);
|
|
|
|
Modules.insert(make_pair(ModuleName, Info));
|
|
|
|
return Info;
|
|
|
|
}
|
|
|
|
|
|
|
|
std::string LLVMSymbolizer::printDILineInfo(DILineInfo LineInfo) const {
|
|
|
|
// By default, DILineInfo contains "<invalid>" for function/filename it
|
|
|
|
// cannot fetch. We replace it to "??" to make our output closer to addr2line.
|
|
|
|
static const std::string kDILineInfoBadString = "<invalid>";
|
|
|
|
std::stringstream Result;
|
|
|
|
if (Opts.PrintFunctions) {
|
|
|
|
std::string FunctionName = LineInfo.getFunctionName();
|
|
|
|
if (FunctionName == kDILineInfoBadString)
|
|
|
|
FunctionName = kBadString;
|
2013-06-28 20:06:25 +08:00
|
|
|
else if (Opts.Demangle)
|
|
|
|
FunctionName = DemangleName(FunctionName);
|
2013-01-22 22:21:19 +08:00
|
|
|
Result << FunctionName << "\n";
|
|
|
|
}
|
|
|
|
std::string Filename = LineInfo.getFileName();
|
|
|
|
if (Filename == kDILineInfoBadString)
|
|
|
|
Filename = kBadString;
|
2013-02-15 16:54:47 +08:00
|
|
|
Result << Filename << ":" << LineInfo.getLine() << ":" << LineInfo.getColumn()
|
|
|
|
<< "\n";
|
2013-01-22 22:21:19 +08:00
|
|
|
return Result.str();
|
|
|
|
}
|
|
|
|
|
|
|
|
#if !defined(_MSC_VER)
|
|
|
|
// Assume that __cxa_demangle is provided by libcxxabi (except for Windows).
|
|
|
|
extern "C" char *__cxa_demangle(const char *mangled_name, char *output_buffer,
|
|
|
|
size_t *length, int *status);
|
|
|
|
#endif
|
|
|
|
|
2013-06-28 20:06:25 +08:00
|
|
|
std::string LLVMSymbolizer::DemangleName(const std::string &Name) {
|
2013-01-22 22:21:19 +08:00
|
|
|
#if !defined(_MSC_VER)
|
2014-01-17 01:25:12 +08:00
|
|
|
// We can spoil names of symbols with C linkage, so use an heuristic
|
|
|
|
// approach to check if the name should be demangled.
|
|
|
|
if (Name.substr(0, 2) != "_Z")
|
|
|
|
return Name;
|
2013-01-22 22:21:19 +08:00
|
|
|
int status = 0;
|
|
|
|
char *DemangledName = __cxa_demangle(Name.c_str(), 0, 0, &status);
|
|
|
|
if (status != 0)
|
2013-06-28 20:06:25 +08:00
|
|
|
return Name;
|
|
|
|
std::string Result = DemangledName;
|
2013-01-22 22:21:19 +08:00
|
|
|
free(DemangledName);
|
2013-06-28 20:06:25 +08:00
|
|
|
return Result;
|
|
|
|
#else
|
|
|
|
return Name;
|
2013-01-22 22:21:19 +08:00
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2013-02-15 16:54:47 +08:00
|
|
|
} // namespace symbolize
|
|
|
|
} // namespace llvm
|