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//===-- LLVMSymbolize.cpp -------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Implementation for LLVM symbolization library.
//
//===----------------------------------------------------------------------===//
#include "LLVMSymbolize.h"
#include "llvm/Object/MachO.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Path.h"
#include <sstream>
namespace llvm {
namespace symbolize {
static bool error(error_code ec) {
if (!ec)
return false;
errs() << "LLVMSymbolizer: error reading file: " << ec.message() << ".\n";
return true;
}
static uint32_t
getDILineInfoSpecifierFlags(const LLVMSymbolizer::Options &Opts) {
uint32_t Flags = llvm::DILineInfoSpecifier::FileLineInfo |
llvm::DILineInfoSpecifier::AbsoluteFilePath;
if (Opts.PrintFunctions)
Flags |= llvm::DILineInfoSpecifier::FunctionName;
return Flags;
}
static void patchFunctionNameInDILineInfo(const std::string &NewFunctionName,
DILineInfo &LineInfo) {
std::string FileName = LineInfo.getFileName();
LineInfo = DILineInfo(StringRef(FileName), StringRef(NewFunctionName),
LineInfo.getLine(), LineInfo.getColumn());
}
ModuleInfo::ModuleInfo(ObjectFile *Obj, DIContext *DICtx)
: Module(Obj), DebugInfoContext(DICtx) {
error_code ec;
for (symbol_iterator si = Module->begin_symbols(), se = Module->end_symbols();
si != se; si.increment(ec)) {
if (error(ec))
return;
SymbolRef::Type SymbolType;
if (error(si->getType(SymbolType)))
continue;
if (SymbolType != SymbolRef::ST_Function &&
SymbolType != SymbolRef::ST_Data)
continue;
uint64_t SymbolAddress;
if (error(si->getAddress(SymbolAddress)) ||
SymbolAddress == UnknownAddressOrSize)
continue;
uint64_t SymbolSize;
if (error(si->getSize(SymbolSize)) || SymbolSize == UnknownAddressOrSize)
continue;
StringRef SymbolName;
if (error(si->getName(SymbolName)))
continue;
// FIXME: If a function has alias, there are two entries in symbol table
// with same address size. Make sure we choose the correct one.
SymbolMapTy &M = SymbolType == SymbolRef::ST_Function ? Functions : Objects;
SymbolDesc SD = { SymbolAddress, SymbolAddress + SymbolSize };
M.insert(std::make_pair(SD, SymbolName));
}
}
bool ModuleInfo::getNameFromSymbolTable(SymbolRef::Type Type, uint64_t Address,
std::string &Name, uint64_t &Addr,
uint64_t &Size) const {
const SymbolMapTy &M = Type == SymbolRef::ST_Function ? Functions : Objects;
SymbolDesc SD = { Address, Address + 1 };
SymbolMapTy::const_iterator it = M.find(SD);
if (it == M.end())
return false;
if (Address < it->first.Addr || Address >= it->first.AddrEnd)
return false;
Name = it->second.str();
Addr = it->first.Addr;
Size = it->first.AddrEnd - it->first.Addr;
return true;
}
DILineInfo ModuleInfo::symbolizeCode(
uint64_t ModuleOffset, const LLVMSymbolizer::Options &Opts) const {
DILineInfo LineInfo;
if (DebugInfoContext) {
LineInfo = DebugInfoContext->getLineInfoForAddress(
ModuleOffset, getDILineInfoSpecifierFlags(Opts));
}
// Override function name from symbol table if necessary.
if (Opts.PrintFunctions && Opts.UseSymbolTable) {
std::string FunctionName;
uint64_t Start, Size;
if (getNameFromSymbolTable(SymbolRef::ST_Function, ModuleOffset,
FunctionName, Start, Size)) {
patchFunctionNameInDILineInfo(FunctionName, LineInfo);
}
}
return LineInfo;
}
DIInliningInfo ModuleInfo::symbolizeInlinedCode(
uint64_t ModuleOffset, const LLVMSymbolizer::Options &Opts) const {
DIInliningInfo InlinedContext;
if (DebugInfoContext) {
InlinedContext = DebugInfoContext->getInliningInfoForAddress(
ModuleOffset, getDILineInfoSpecifierFlags(Opts));
}
// Make sure there is at least one frame in context.
if (InlinedContext.getNumberOfFrames() == 0) {
InlinedContext.addFrame(DILineInfo());
}
// Override the function name in lower frame with name from symbol table.
if (Opts.PrintFunctions && Opts.UseSymbolTable) {
DIInliningInfo PatchedInlinedContext;
for (uint32_t i = 0, n = InlinedContext.getNumberOfFrames(); i < n; i++) {
DILineInfo LineInfo = InlinedContext.getFrame(i);
if (i == n - 1) {
std::string FunctionName;
uint64_t Start, Size;
if (getNameFromSymbolTable(SymbolRef::ST_Function, ModuleOffset,
FunctionName, Start, Size)) {
patchFunctionNameInDILineInfo(FunctionName, LineInfo);
}
}
PatchedInlinedContext.addFrame(LineInfo);
}
InlinedContext = PatchedInlinedContext;
}
return InlinedContext;
}
bool ModuleInfo::symbolizeData(uint64_t ModuleOffset, std::string &Name,
uint64_t &Start, uint64_t &Size) const {
return getNameFromSymbolTable(SymbolRef::ST_Data, ModuleOffset, Name, Start,
Size);
}
const char LLVMSymbolizer::kBadString[] = "??";
std::string LLVMSymbolizer::symbolizeCode(const std::string &ModuleName,
uint64_t ModuleOffset) {
ModuleInfo *Info = getOrCreateModuleInfo(ModuleName);
if (Info == 0)
return printDILineInfo(DILineInfo());
if (Opts.PrintInlining) {
DIInliningInfo InlinedContext =
Info->symbolizeInlinedCode(ModuleOffset, Opts);
uint32_t FramesNum = InlinedContext.getNumberOfFrames();
assert(FramesNum > 0);
std::string Result;
for (uint32_t i = 0; i < FramesNum; i++) {
DILineInfo LineInfo = InlinedContext.getFrame(i);
Result += printDILineInfo(LineInfo);
}
return Result;
}
DILineInfo LineInfo = Info->symbolizeCode(ModuleOffset, Opts);
return printDILineInfo(LineInfo);
}
std::string LLVMSymbolizer::symbolizeData(const std::string &ModuleName,
uint64_t ModuleOffset) {
std::string Name = kBadString;
uint64_t Start = 0;
uint64_t Size = 0;
if (Opts.UseSymbolTable) {
if (ModuleInfo *Info = getOrCreateModuleInfo(ModuleName)) {
if (Info->symbolizeData(ModuleOffset, Name, Start, Size))
DemangleName(Name);
}
}
std::stringstream ss;
ss << Name << "\n" << Start << " " << Size << "\n";
return ss.str();
}
// Returns true if the object endianness is known.
static bool getObjectEndianness(const ObjectFile *Obj, bool &IsLittleEndian) {
// FIXME: Implement this when libLLVMObject allows to do it easily.
IsLittleEndian = true;
return true;
}
static ObjectFile *getObjectFile(const std::string &Path) {
OwningPtr<MemoryBuffer> Buff;
if (error_code ec = MemoryBuffer::getFile(Path, Buff))
error(ec);
return ObjectFile::createObjectFile(Buff.take());
}
static std::string getDarwinDWARFResourceForModule(const std::string &Path) {
StringRef Basename = sys::path::filename(Path);
const std::string &DSymDirectory = Path + ".dSYM";
SmallString<16> ResourceName = StringRef(DSymDirectory);
sys::path::append(ResourceName, "Contents", "Resources", "DWARF");
sys::path::append(ResourceName, Basename);
return ResourceName.str();
}
ModuleInfo *
LLVMSymbolizer::getOrCreateModuleInfo(const std::string &ModuleName) {
ModuleMapTy::iterator I = Modules.find(ModuleName);
if (I != Modules.end())
return I->second;
ObjectFile *Obj = getObjectFile(ModuleName);
if (Obj == 0) {
// Module name doesn't point to a valid object file.
Modules.insert(make_pair(ModuleName, (ModuleInfo *)0));
return 0;
}
DIContext *Context = 0;
bool IsLittleEndian;
if (getObjectEndianness(Obj, IsLittleEndian)) {
// On Darwin we may find DWARF in separate object file in
// resource directory.
ObjectFile *DbgObj = Obj;
if (isa<MachOObjectFile>(Obj)) {
const std::string &ResourceName =
getDarwinDWARFResourceForModule(ModuleName);
ObjectFile *ResourceObj = getObjectFile(ResourceName);
if (ResourceObj != 0)
DbgObj = ResourceObj;
}
Context = DIContext::getDWARFContext(DbgObj);
assert(Context);
}
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;
DemangleName(FunctionName);
Result << FunctionName << "\n";
}
std::string Filename = LineInfo.getFileName();
if (Filename == kDILineInfoBadString)
Filename = kBadString;
Result << Filename << ":" << LineInfo.getLine() << ":" << LineInfo.getColumn()
<< "\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
void LLVMSymbolizer::DemangleName(std::string &Name) const {
#if !defined(_MSC_VER)
if (!Opts.Demangle)
return;
int status = 0;
char *DemangledName = __cxa_demangle(Name.c_str(), 0, 0, &status);
if (status != 0)
return;
Name = DemangledName;
free(DemangledName);
#endif
}
} // namespace symbolize
} // namespace llvm