llvm-symbolizer: add support for .gnu_debuglink section
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188386 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-symbolizer/LLVMSymbolize.cpp b/tools/llvm-symbolizer/LLVMSymbolize.cpp
index 0346fb2..c8edde7 100644
--- a/tools/llvm-symbolizer/LLVMSymbolize.cpp
+++ b/tools/llvm-symbolizer/LLVMSymbolize.cpp
@@ -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 @@
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 @@
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;