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Use zlib to uncompress debug sections in DWARF parser.

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This makes llvm-dwarfdump and llvm-symbolizer understand
debug info sections compressed by ld.gold linker.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180088 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov
2013-04-23 10:17:34 +00:00
parent ab4d569f28
commit 005159e924
9 changed files with 87 additions and 1 deletions
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38
lib/DebugInfo/DWARFContext.cpp
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@ -10,6 +10,8 @@
#include "DWARFContext.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Compression.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Path.h"
@ -483,6 +485,22 @@ DIInliningInfo DWARFContext::getInliningInfoForAddress(uint64_t Address,
return InliningInfo;
}
static bool consumeCompressedDebugSectionHeader(StringRef &data,
uint64_t &OriginalSize) {
// Consume "ZLIB" prefix.
if (!data.startswith("ZLIB"))
return false;
data = data.substr(4);
// Consume uncompressed section size (big-endian 8 bytes).
DataExtractor extractor(data, false, 8);
uint32_t Offset = 0;
OriginalSize = extractor.getU64(&Offset);
if (Offset == 0)
return false;
data = data.substr(Offset);
return true;
}
DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj) :
IsLittleEndian(Obj->isLittleEndian()),
AddressSize(Obj->getBytesInAddress()) {
@ -497,6 +515,22 @@ DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj) :
name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
// Check if debug info section is compressed with zlib.
if (name.startswith("zdebug_")) {
uint64_t OriginalSize;
if (!zlib::isAvailable() ||
!consumeCompressedDebugSectionHeader(data, OriginalSize))
continue;
OwningPtr<MemoryBuffer> UncompressedSection;
if (zlib::uncompress(data, UncompressedSection, OriginalSize) !=
zlib::StatusOK)
continue;
// Make data point to uncompressed section contents and save its contents.
name = name.substr(1);
data = UncompressedSection->getBuffer();
UncompressedSections.push_back(UncompressedSection.take());
}
StringRef *Section = StringSwitch<StringRef*>(name)
.Case("debug_info", &InfoSection)
.Case("debug_abbrev", &AbbrevSection)
@ -584,4 +618,8 @@ DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj) :
}
}
DWARFContextInMemory::~DWARFContextInMemory() {
DeleteContainerPointers(UncompressedSections);
}
void DWARFContextInMemory::anchor() { }