mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174332 91177308-0d34-0410-b5e6-96231b3b80d8
273 lines
9.3 KiB
C++
273 lines
9.3 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/Object/MachO.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/Path.h"
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#include <sstream>
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namespace llvm {
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namespace symbolize {
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static uint32_t getDILineInfoSpecifierFlags(
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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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DILineInfo ModuleInfo::symbolizeCode(uint64_t ModuleOffset,
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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,
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ModuleOffset, 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(uint64_t ModuleOffset,
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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();
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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,
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ModuleOffset, 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,
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ModuleOffset, Name, Start, Size);
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}
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static bool error(error_code ec) {
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if (!ec) 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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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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assert(Module);
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error_code ec;
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for (symbol_iterator si = Module->begin_symbols(),
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se = Module->end_symbols();
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si != se; si.increment(ec)) {
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if (error(ec)) return false;
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uint64_t SymbolAddress;
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uint64_t SymbolSize;
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SymbolRef::Type SymbolType;
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if (error(si->getAddress(SymbolAddress)) ||
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SymbolAddress == UnknownAddressOrSize) continue;
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if (error(si->getSize(SymbolSize)) ||
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SymbolSize == UnknownAddressOrSize) continue;
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if (error(si->getType(SymbolType))) continue;
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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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if (SymbolAddress <= Address && Address < SymbolAddress + SymbolSize &&
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SymbolType == Type) {
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StringRef SymbolName;
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if (error(si->getName(SymbolName))) continue;
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Name = SymbolName.str();
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Addr = SymbolAddress;
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Size = SymbolSize;
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return true;
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}
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}
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return false;
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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 = Info->symbolizeInlinedCode(
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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))
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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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// Returns true if the object endianness is known.
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static bool getObjectEndianness(const ObjectFile *Obj,
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bool &IsLittleEndian) {
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// FIXME: Implement this when libLLVMObject allows to do it easily.
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IsLittleEndian = true;
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return true;
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}
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static ObjectFile *getObjectFile(const std::string &Path) {
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OwningPtr<MemoryBuffer> Buff;
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MemoryBuffer::getFile(Path, Buff);
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return ObjectFile::createObjectFile(Buff.take());
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}
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static std::string getDarwinDWARFResourceForModule(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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ModuleInfo *LLVMSymbolizer::getOrCreateModuleInfo(
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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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ObjectFile *Obj = getObjectFile(ModuleName);
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ObjectFile *DbgObj = Obj;
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if (Obj == 0) {
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// Module name doesn't point to a 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 = 0;
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bool IsLittleEndian;
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if (getObjectEndianness(Obj, IsLittleEndian)) {
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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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if (isa<MachOObjectFile>(Obj)) {
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const std::string &ResourceName = getDarwinDWARFResourceForModule(
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ModuleName);
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ObjectFile *ResourceObj = getObjectFile(ResourceName);
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if (ResourceObj != 0)
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DbgObj = ResourceObj;
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}
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Context = DIContext::getDWARFContext(DbgObj);
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assert(Context);
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}
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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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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()
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<< ":" << LineInfo.getColumn() << "\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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void LLVMSymbolizer::DemangleName(std::string &Name) const {
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#if !defined(_MSC_VER)
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if (!Opts.Demangle)
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return;
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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;
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Name = DemangledName;
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free(DemangledName);
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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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