mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-23 16:30:00 +00:00
222fcc59cb
Summary: Teach llvm-symbolizer about PowerPC64 ELF function descriptors. Symbols in the .opd section point to function descriptors, the first word of which is a pointer to the real function. For the purposes of symbolizing we pretend that the symbol points directly to the function. This is enough to get decent function names in stack traces for unoptimized binaries, which fixes the sanitizer print-stack-trace test on PowerPC64 Linux. Reviewers: kcc, willschm, samsonov Reviewed By: samsonov Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D6110 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221514 91177308-0d34-0410-b5e6-96231b3b80d8
516 lines
18 KiB
C++
516 lines
18 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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std::unique_ptr<DataExtractor> OpdExtractor;
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uint64_t OpdAddress = 0;
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// Find the .opd (function descriptor) section if any, for big-endian
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// PowerPC64 ELF.
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if (Module->getArch() == Triple::ppc64) {
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for (section_iterator Section : Module->sections()) {
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StringRef Name;
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if (!error(Section->getName(Name)) && Name == ".opd") {
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StringRef Data;
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if (!error(Section->getContents(Data))) {
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OpdExtractor.reset(new DataExtractor(Data, Module->isLittleEndian(),
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Module->getBytesInAddress()));
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OpdAddress = Section->getAddress();
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}
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break;
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}
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}
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}
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for (const SymbolRef &Symbol : Module->symbols()) {
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addSymbol(Symbol, OpdExtractor.get(), OpdAddress);
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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, OpdExtractor.get(), OpdAddress);
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}
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}
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}
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void ModuleInfo::addSymbol(const SymbolRef &Symbol, DataExtractor *OpdExtractor,
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uint64_t OpdAddress) {
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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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if (OpdExtractor) {
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// For big-endian PowerPC64 ELF, symbols in the .opd section refer to
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// function descriptors. The first word of the descriptor is a pointer to
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// the function's code.
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// For the purposes of symbolization, pretend the symbol's address is that
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// of the function's code, not the descriptor.
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uint64_t OpdOffset = SymbolAddress - OpdAddress;
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uint32_t OpdOffset32 = OpdOffset;
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if (OpdOffset == OpdOffset32 &&
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OpdExtractor->isValidOffsetForAddress(OpdOffset32))
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SymbolAddress = OpdExtractor->getAddress(&OpdOffset32);
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}
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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) {
|
|
BinaryName = ModuleName.substr(0, ColonPos);
|
|
ArchName = ArchStr;
|
|
}
|
|
}
|
|
ObjectPair Objects = getOrCreateObjects(BinaryName, ArchName);
|
|
|
|
if (!Objects.first) {
|
|
// Failed to find valid object file.
|
|
Modules.insert(make_pair(ModuleName, (ModuleInfo *)nullptr));
|
|
return nullptr;
|
|
}
|
|
DIContext *Context = DIContext::getDWARFContext(*Objects.second);
|
|
assert(Context);
|
|
ModuleInfo *Info = new ModuleInfo(Objects.first, 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 != FunctionNameKind::None) {
|
|
std::string FunctionName = LineInfo.FunctionName;
|
|
if (FunctionName == kDILineInfoBadString)
|
|
FunctionName = kBadString;
|
|
else if (Opts.Demangle)
|
|
FunctionName = DemangleName(FunctionName);
|
|
Result << FunctionName << "\n";
|
|
}
|
|
std::string Filename = LineInfo.FileName;
|
|
if (Filename == kDILineInfoBadString)
|
|
Filename = kBadString;
|
|
Result << Filename << ":" << LineInfo.Line << ":" << LineInfo.Column << "\n";
|
|
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
|
|
|
|
std::string LLVMSymbolizer::DemangleName(const std::string &Name) {
|
|
#if !defined(_MSC_VER)
|
|
// 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;
|
|
int status = 0;
|
|
char *DemangledName = __cxa_demangle(Name.c_str(), nullptr, nullptr, &status);
|
|
if (status != 0)
|
|
return Name;
|
|
std::string Result = DemangledName;
|
|
free(DemangledName);
|
|
return Result;
|
|
#else
|
|
return Name;
|
|
#endif
|
|
}
|
|
|
|
} // namespace symbolize
|
|
} // namespace llvm
|