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-rw-r--r--utils/llvm-symbolizer/llvm-symbolizer.cc237
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diff --git a/utils/llvm-symbolizer/llvm-symbolizer.cc b/utils/llvm-symbolizer/llvm-symbolizer.cc
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-//===-- llvm-symbolizer.cpp - Simple addr2line-like symbolizer ------------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This utility works much like "addr2line". It is able of transforming
-// tuples (module name, module offset) to code locations (function name,
-// file, line number, column number). It is targeted for compiler-rt tools
-// (especially AddressSanitizer and ThreadSanitizer) that can use it
-// to symbolize stack traces in their error reports.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/ADT/OwningPtr.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/DebugInfo/DIContext.h"
-#include "llvm/Object/ObjectFile.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/ManagedStatic.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/PrettyStackTrace.h"
-#include "llvm/Support/Signals.h"
-#include "llvm/Support/raw_ostream.h"
-
-#include <cstdio>
-#include <cstring>
-#include <iostream> // NOLINT
-#include <map>
-#include <string>
-
-using namespace llvm;
-using namespace object;
-using std::string;
-
-static cl::opt<bool>
-UseSymbolTable("use-symbol-table", cl::init(true),
- cl::desc("Prefer names in symbol table to names "
- "in debug info"));
-
-static cl::opt<bool>
-PrintFunctions("functions", cl::init(true),
- cl::desc("Print function names as well as line "
- "information for a given address"));
-
-static StringRef ToolInvocationPath;
-
-static bool error(error_code ec) {
- if (!ec) return false;
- errs() << ToolInvocationPath << ": error reading file: "
- << ec.message() << ".\n";
- return true;
-}
-
-namespace {
-class ModuleInfo {
- OwningPtr<ObjectFile> Module;
- OwningPtr<DIContext> DebugInfoContext;
- public:
- ModuleInfo(ObjectFile *obj, DIContext *di_ctx)
- : Module(obj), DebugInfoContext(di_ctx) {}
- DILineInfo symbolizeCode(uint64_t module_offset) const {
- DILineInfo dli;
- if (DebugInfoContext) {
- uint32_t flags = llvm::DILineInfoSpecifier::FileLineInfo |
- llvm::DILineInfoSpecifier::AbsoluteFilePath;
- if (PrintFunctions)
- flags |= llvm::DILineInfoSpecifier::FunctionName;
- dli = DebugInfoContext->getLineInfoForAddress(
- module_offset, flags);
- }
- // Override function name from symbol table if necessary.
- if (PrintFunctions && UseSymbolTable) {
- string filename = dli.getFileName();
- string function = dli.getFunctionName();
- if (getFunctionNameFromSymbolTable(module_offset, function)) {
- dli = DILineInfo(StringRef(filename), StringRef(function),
- dli.getLine(), dli.getColumn());
- }
- }
- return dli;
- }
- private:
- bool getFunctionNameFromSymbolTable(size_t address,
- string &function_name) const {
- assert(Module);
- error_code ec;
- for (symbol_iterator si = Module->begin_symbols(),
- se = Module->end_symbols();
- si != se; si.increment(ec)) {
- if (error(ec)) return false;
- uint64_t Address;
- uint64_t Size;
- if (error(si->getAddress(Address))) continue;
- if (error(si->getSize(Size))) 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.
- if (Address <= address && address < Address + Size) {
- StringRef Name;
- if (error(si->getName(Name))) continue;
- function_name = Name.str();
- return true;
- }
- }
- return false;
- }
-};
-
-typedef std::map<string, ModuleInfo*> ModuleMapTy;
-typedef ModuleMapTy::iterator ModuleMapIter;
-typedef ModuleMapTy::const_iterator ModuleMapConstIter;
-} // namespace
-
-static ModuleMapTy modules;
-
-static bool isFullNameOfDwarfSection(const StringRef &full_name,
- const StringRef &short_name) {
- static const char kDwarfPrefix[] = "__DWARF,";
- StringRef name = full_name;
- // Skip "__DWARF," prefix.
- if (name.startswith(kDwarfPrefix))
- name = name.substr(strlen(kDwarfPrefix));
- // Skip . and _ prefixes.
- name = name.substr(name.find_first_not_of("._"));
- return (name == short_name);
-}
-
-// Returns true if the object endianness is known.
-static bool getObjectEndianness(const ObjectFile *obj,
- bool &is_little_endian) {
- // FIXME: Implement this when libLLVMObject allows to do it easily.
- is_little_endian = true;
- return true;
-}
-
-static ModuleInfo *getOrCreateModuleInfo(const string &module_name) {
- ModuleMapIter I = modules.find(module_name);
- if (I != modules.end())
- return I->second;
-
- OwningPtr<MemoryBuffer> Buff;
- MemoryBuffer::getFile(module_name, Buff);
- ObjectFile *obj = ObjectFile::createObjectFile(Buff.take());
- assert(obj);
-
- DIContext *di_context = 0;
- bool IsLittleEndian;
- if (getObjectEndianness(obj, IsLittleEndian)) {
- StringRef DebugInfoSection;
- StringRef DebugAbbrevSection;
- StringRef DebugLineSection;
- StringRef DebugArangesSection;
- StringRef DebugStringSection;
- error_code ec;
- for (section_iterator i = obj->begin_sections(),
- e = obj->end_sections();
- i != e; i.increment(ec)) {
- if (error(ec)) break;
- StringRef name;
- if (error(i->getName(name))) continue;
- StringRef data;
- if (error(i->getContents(data))) continue;
- if (isFullNameOfDwarfSection(name, "debug_info"))
- DebugInfoSection = data;
- else if (isFullNameOfDwarfSection(name, "debug_abbrev"))
- DebugAbbrevSection = data;
- else if (isFullNameOfDwarfSection(name, "debug_line"))
- DebugLineSection = data;
- // Don't use debug_aranges for now, as address ranges contained
- // there may not cover all instructions in the module
- // else if (isFullNameOfDwarfSection(name, "debug_aranges"))
- // DebugArangesSection = data;
- else if (isFullNameOfDwarfSection(name, "debug_str"))
- DebugStringSection = data;
- }
-
- di_context = DIContext::getDWARFContext(
- IsLittleEndian, DebugInfoSection, DebugAbbrevSection,
- DebugArangesSection, DebugLineSection, DebugStringSection);
- assert(di_context);
- }
-
- ModuleInfo *module_info = new ModuleInfo(obj, di_context);
- modules.insert(make_pair(module_name, module_info));
- return module_info;
-}
-
-static void symbolize(const string &module_name,
- const string &module_offset_str) {
- // FIXME: check that module_name points to valid file.
- ModuleInfo *module_info = getOrCreateModuleInfo(module_name);
- DILineInfo line_info;
- uint64_t module_offset;
- if (!StringRef(module_offset_str).getAsInteger(0, module_offset)) {
- line_info = module_info->symbolizeCode(module_offset);
- }
- // By default, DILineInfo contains "<invalid>" for function/filename it
- // cannot fetch. We replace it to "??" to make our output closer to addr2line.
- static const string kDILineInfoBadString = "<invalid>";
- static const string kSymbolizerBadString = "??";
-
- if (PrintFunctions) {
- string function_name = line_info.getFunctionName();
- if (function_name == kDILineInfoBadString)
- function_name = kSymbolizerBadString;
- outs() << function_name << "\n";
- }
- string filename = line_info.getFileName();
- if (filename == kDILineInfoBadString)
- filename = kSymbolizerBadString;
- outs() << filename <<
- ":" << line_info.getLine() <<
- ":" << line_info.getColumn() <<
- "\n\n"; // Print extra empty line to mark the end of output.
- outs().flush();
-}
-
-int main(int argc, char **argv) {
- // Print stack trace if we signal out.
- sys::PrintStackTraceOnErrorSignal();
- PrettyStackTraceProgram X(argc, argv);
- llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
-
- cl::ParseCommandLineOptions(argc, argv, "llvm symbolizer for compiler-rt\n");
- ToolInvocationPath = argv[0];
-
- string module_name;
- string module_offset_str;
- while (std::cin >> module_name >> module_offset_str) {
- symbolize(module_name, module_offset_str);
- }
- return 0;
-}
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