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llvm-symbolizer: add support for .gnu_debuglink section

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188386 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov 2013-08-14 17:09:30 +00:00
parent dd34dc99fd
commit 6889483ca4
3 changed files with 87 additions and 0 deletions
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BIN
test/DebugInfo/Inputs/dwarfdump-test.elf-x86-64.debuglink Executable file
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Binary file not shown.

4
test/DebugInfo/llvm-symbolizer.test
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@ -1,4 +1,5 @@
RUN: echo "%p/Inputs/dwarfdump-test.elf-x86-64 0x400559" > %t.input
RUN: echo "%p/Inputs/dwarfdump-test.elf-x86-64.debuglink 0x400559" >> %t.input
RUN: echo "%p/Inputs/dwarfdump-test.elf-x86-64 0x400436" >> %t.input
RUN: echo "%p/Inputs/dwarfdump-test4.elf-x86-64 0x62c" >> %t.input
RUN: echo "%p/Inputs/dwarfdump-inl-test.elf-x86-64 0x710" >> %t.input
@ -13,6 +14,9 @@ RUN: --default-arch=i386 < %t.input | FileCheck %s
CHECK: main
CHECK-NEXT: /tmp/dbginfo{{[/\\]}}dwarfdump-test.cc:16
CHECK: main
CHECK-NEXT: /tmp/dbginfo{{[/\\]}}dwarfdump-test.cc:16
CHECK: _start
CHECK: _Z1cv

83
tools/llvm-symbolizer/LLVMSymbolize.cpp
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@ -15,7 +15,10 @@
#include "llvm/ADT/STLExtras.h"
#include "llvm/Object/MachO.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Compression.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include <sstream>
@ -215,6 +218,74 @@ static std::string getDarwinDWARFResourceForPath(const std::string &Path) {
return ResourceName.str();
}
static bool checkFileCRC(StringRef Path, uint32_t CRCHash) {
OwningPtr<MemoryBuffer> MB;
if (MemoryBuffer::getFileOrSTDIN(Path, MB))
return false;
return !zlib::isAvailable() || CRCHash == zlib::crc32(MB->getBuffer());
}
static bool findDebugBinary(const std::string &OrigPath,
const std::string &DebuglinkName, uint32_t CRCHash,
std::string &Result) {
SmallString<16> OrigDir(OrigPath);
llvm::sys::path::remove_filename(OrigDir);
SmallString<16> DebugPath = OrigDir;
// Try /path/to/original_binary/debuglink_name
llvm::sys::path::append(DebugPath, DebuglinkName);
if (checkFileCRC(DebugPath, CRCHash)) {
Result = DebugPath.str();
return true;
}
// Try /path/to/original_binary/.debug/debuglink_name
DebugPath = OrigPath;
llvm::sys::path::append(DebugPath, ".debug", DebuglinkName);
if (checkFileCRC(DebugPath, CRCHash)) {
Result = DebugPath.str();
return true;
}
// Try /usr/lib/debug/path/to/original_binary/debuglink_name
DebugPath = "/usr/lib/debug";
llvm::sys::path::append(DebugPath, llvm::sys::path::relative_path(OrigDir),
DebuglinkName);
if (checkFileCRC(DebugPath, CRCHash)) {
Result = DebugPath.str();
return true;
}
return false;
}
static bool getGNUDebuglinkContents(const Binary *Bin, std::string &DebugName,
uint32_t &CRCHash) {
const ObjectFile *Obj = dyn_cast<ObjectFile>(Bin);
if (!Obj)
return false;
error_code EC;
for (section_iterator I = Obj->begin_sections(), E = Obj->end_sections();
I != E; I.increment(EC)) {
StringRef Name;
I->getName(Name);
Name = Name.substr(Name.find_first_not_of("._"));
if (Name == "gnu_debuglink") {
StringRef Data;
I->getContents(Data);
DataExtractor DE(Data, Obj->isLittleEndian(), 0);
uint32_t Offset = 0;
if (const char *DebugNameStr = DE.getCStr(&Offset)) {
// 4-byte align the offset.
Offset = (Offset + 3) & ~0x3;
if (DE.isValidOffsetForDataOfSize(Offset, 4)) {
DebugName = DebugNameStr;
CRCHash = DE.getU32(&Offset);
return true;
}
}
break;
}
}
return false;
}
LLVMSymbolizer::BinaryPair
LLVMSymbolizer::getOrCreateBinary(const std::string &Path) {
BinaryMapTy::iterator I = BinaryForPath.find(Path);
@ -241,6 +312,18 @@ LLVMSymbolizer::getOrCreateBinary(const std::string &Path) {
ParsedBinariesAndObjects.push_back(DbgBin);
}
}
// Try to locate the debug binary using .gnu_debuglink section.
if (DbgBin == 0) {
std::string DebuglinkName;
uint32_t CRCHash;
std::string DebugBinaryPath;
if (getGNUDebuglinkContents(Bin, DebuglinkName, CRCHash) &&
findDebugBinary(Path, DebuglinkName, CRCHash, DebugBinaryPath) &&
!error(createBinary(DebugBinaryPath, ParsedDbgBinary))) {
DbgBin = ParsedDbgBinary.take();
ParsedBinariesAndObjects.push_back(DbgBin);
}
}
}
if (DbgBin == 0)
DbgBin = Bin;