#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"
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()) {
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)
}
}
+DWARFContextInMemory::~DWARFContextInMemory() {
+ DeleteContainerPointers(UncompressedSections);
+}
+
void DWARFContextInMemory::anchor() { }
StringRef RangeDWOSection;
StringRef AddrSection;
+ SmallVector<MemoryBuffer*, 4> UncompressedSections;
+
public:
DWARFContextInMemory(object::ObjectFile *);
+ ~DWARFContextInMemory();
virtual bool isLittleEndian() const { return IsLittleEndian; }
virtual uint8_t getAddressSize() const { return AddressSize; }
virtual const RelocAddrMap &infoRelocMap() const { return InfoRelocMap; }
--- /dev/null
+REQUIRES: zlib
+
+RUN: llvm-dwarfdump %p/Inputs/dwarfdump-test-zlib.elf-x86-64 \
+RUN: | FileCheck %s -check-prefix FULLDUMP
+RUN: llvm-dwarfdump %p/Inputs/dwarfdump-test-zlib.elf-x86-64 \
+RUN: --address=0x400559 --functions | FileCheck %s -check-prefix MAIN
+
+FULLDUMP: .debug_abbrev contents
+FULLDUMP: .debug_info contents
+
+MAIN: main
+MAIN-NEXT: /tmp/dbginfo{{[/\\]}}dwarfdump-test-zlib.cc:16