[llvm] r256008 - Improve DWARFDebugFrame::parse to also handle __eh_frame.
Pete Cooper via llvm-commits
llvm-commits at lists.llvm.org
Fri Dec 18 10:51:08 PST 2015
Author: pete
Date: Fri Dec 18 12:51:08 2015
New Revision: 256008
URL: http://llvm.org/viewvc/llvm-project?rev=256008&view=rev
Log:
Improve DWARFDebugFrame::parse to also handle __eh_frame.
LLVM MC has single methods which can handle the output of EH frame and DWARF CIE's and FDE's.
This code improves DWARFDebugFrame::parse to do the same for parsing.
This also allows llvm-objdump to support the --dwarf=frames option which objdump supports. This
option dumps the .eh_frame section using the new code in DWARFDebugFrame::parse.
http://reviews.llvm.org/D15535
Reviewed by Rafael Espindola.
Modified:
llvm/trunk/include/llvm/DebugInfo/DIContext.h
llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFContext.h
llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFDebugFrame.h
llvm/trunk/include/llvm/DebugInfo/PDB/PDBContext.h
llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp
llvm/trunk/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp
llvm/trunk/lib/DebugInfo/PDB/PDBContext.cpp
llvm/trunk/test/tools/llvm-objdump/eh_frame-arm64.test
llvm/trunk/tools/llvm-objdump/MachODump.cpp
llvm/trunk/tools/llvm-objdump/llvm-objdump.cpp
llvm/trunk/tools/llvm-objdump/llvm-objdump.h
Modified: llvm/trunk/include/llvm/DebugInfo/DIContext.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/DebugInfo/DIContext.h?rev=256008&r1=256007&r2=256008&view=diff
==============================================================================
--- llvm/trunk/include/llvm/DebugInfo/DIContext.h (original)
+++ llvm/trunk/include/llvm/DebugInfo/DIContext.h Fri Dec 18 12:51:08 2015
@@ -140,7 +140,8 @@ public:
DIContext(DIContextKind K) : Kind(K) {}
virtual ~DIContext() {}
- virtual void dump(raw_ostream &OS, DIDumpType DumpType = DIDT_All) = 0;
+ virtual void dump(raw_ostream &OS, DIDumpType DumpType = DIDT_All,
+ bool DumpEH = false) = 0;
virtual DILineInfo getLineInfoForAddress(uint64_t Address,
DILineInfoSpecifier Specifier = DILineInfoSpecifier()) = 0;
Modified: llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFContext.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFContext.h?rev=256008&r1=256007&r2=256008&view=diff
==============================================================================
--- llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFContext.h (original)
+++ llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFContext.h Fri Dec 18 12:51:08 2015
@@ -48,6 +48,7 @@ class DWARFContext : public DIContext {
std::unique_ptr<DWARFDebugAranges> Aranges;
std::unique_ptr<DWARFDebugLine> Line;
std::unique_ptr<DWARFDebugFrame> DebugFrame;
+ std::unique_ptr<DWARFDebugFrame> EHFrame;
std::unique_ptr<DWARFDebugMacro> Macro;
DWARFUnitSection<DWARFCompileUnit> DWOCUs;
@@ -81,7 +82,8 @@ public:
return DICtx->getKind() == CK_DWARF;
}
- void dump(raw_ostream &OS, DIDumpType DumpType = DIDT_All) override;
+ void dump(raw_ostream &OS, DIDumpType DumpType = DIDT_All,
+ bool DumpEH = false) override;
typedef DWARFUnitSection<DWARFCompileUnit>::iterator_range cu_iterator_range;
typedef DWARFUnitSection<DWARFTypeUnit>::iterator_range tu_iterator_range;
@@ -168,6 +170,9 @@ public:
/// Get a pointer to the parsed frame information object.
const DWARFDebugFrame *getDebugFrame();
+ /// Get a pointer to the parsed eh frame information object.
+ const DWARFDebugFrame *getEHFrame();
+
/// Get a pointer to the parsed DebugMacro object.
const DWARFDebugMacro *getDebugMacro();
@@ -191,6 +196,7 @@ public:
virtual const DWARFSection &getLocSection() = 0;
virtual StringRef getARangeSection() = 0;
virtual StringRef getDebugFrameSection() = 0;
+ virtual StringRef getEHFrameSection() = 0;
virtual const DWARFSection &getLineSection() = 0;
virtual StringRef getStringSection() = 0;
virtual StringRef getRangeSection() = 0;
@@ -242,6 +248,7 @@ class DWARFContextInMemory : public DWAR
DWARFSection LocSection;
StringRef ARangeSection;
StringRef DebugFrameSection;
+ StringRef EHFrameSection;
DWARFSection LineSection;
StringRef StringSection;
StringRef RangeSection;
@@ -281,6 +288,7 @@ public:
const DWARFSection &getLocSection() override { return LocSection; }
StringRef getARangeSection() override { return ARangeSection; }
StringRef getDebugFrameSection() override { return DebugFrameSection; }
+ StringRef getEHFrameSection() override { return EHFrameSection; }
const DWARFSection &getLineSection() override { return LineSection; }
StringRef getStringSection() override { return StringSection; }
StringRef getRangeSection() override { return RangeSection; }
Modified: llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFDebugFrame.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFDebugFrame.h?rev=256008&r1=256007&r2=256008&view=diff
==============================================================================
--- llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFDebugFrame.h (original)
+++ llvm/trunk/include/llvm/DebugInfo/DWARF/DWARFDebugFrame.h Fri Dec 18 12:51:08 2015
@@ -19,11 +19,13 @@ namespace llvm {
class FrameEntry;
-/// \brief A parsed .debug_frame section
+/// \brief A parsed .debug_frame or .eh_frame section
///
class DWARFDebugFrame {
+ // True if this is parsing an eh_frame section.
+ bool IsEH;
public:
- DWARFDebugFrame();
+ DWARFDebugFrame(bool IsEH);
~DWARFDebugFrame();
/// \brief Dump the section data into the given stream.
Modified: llvm/trunk/include/llvm/DebugInfo/PDB/PDBContext.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/DebugInfo/PDB/PDBContext.h?rev=256008&r1=256007&r2=256008&view=diff
==============================================================================
--- llvm/trunk/include/llvm/DebugInfo/PDB/PDBContext.h (original)
+++ llvm/trunk/include/llvm/DebugInfo/PDB/PDBContext.h Fri Dec 18 12:51:08 2015
@@ -38,7 +38,8 @@ public:
return DICtx->getKind() == CK_PDB;
}
- void dump(raw_ostream &OS, DIDumpType DumpType = DIDT_All) override;
+ void dump(raw_ostream &OS, DIDumpType DumpType = DIDT_All,
+ bool DumpEH = false) override;
DILineInfo getLineInfoForAddress(
uint64_t Address,
Modified: llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp?rev=256008&r1=256007&r2=256008&view=diff
==============================================================================
--- llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp (original)
+++ llvm/trunk/lib/DebugInfo/DWARF/DWARFContext.cpp Fri Dec 18 12:51:08 2015
@@ -72,7 +72,7 @@ static void dumpAccelSection(raw_ostream
Accel.dump(OS);
}
-void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType) {
+void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType, bool DumpEH) {
if (DumpType == DIDT_All || DumpType == DIDT_Abbrev) {
OS << ".debug_abbrev contents:\n";
getDebugAbbrev()->dump(OS);
@@ -125,6 +125,10 @@ void DWARFContext::dump(raw_ostream &OS,
if (DumpType == DIDT_All || DumpType == DIDT_Frames) {
OS << "\n.debug_frame contents:\n";
getDebugFrame()->dump(OS);
+ if (DumpEH) {
+ OS << "\n.eh_frame contents:\n";
+ getEHFrame()->dump(OS);
+ }
}
if (DumpType == DIDT_All || DumpType == DIDT_Macro) {
@@ -355,7 +359,18 @@ const DWARFDebugFrame *DWARFContext::get
// http://lists.dwarfstd.org/htdig.cgi/dwarf-discuss-dwarfstd.org/2011-December/001173.html
DataExtractor debugFrameData(getDebugFrameSection(), isLittleEndian(),
getAddressSize());
- DebugFrame.reset(new DWARFDebugFrame());
+ DebugFrame.reset(new DWARFDebugFrame(false /* IsEH */));
+ DebugFrame->parse(debugFrameData);
+ return DebugFrame.get();
+}
+
+const DWARFDebugFrame *DWARFContext::getEHFrame() {
+ if (EHFrame)
+ return EHFrame.get();
+
+ DataExtractor debugFrameData(getEHFrameSection(), isLittleEndian(),
+ getAddressSize());
+ DebugFrame.reset(new DWARFDebugFrame(true /* IsEH */));
DebugFrame->parse(debugFrameData);
return DebugFrame.get();
}
@@ -641,6 +656,7 @@ DWARFContextInMemory::DWARFContextInMemo
.Case("debug_line", &LineSection.Data)
.Case("debug_aranges", &ARangeSection)
.Case("debug_frame", &DebugFrameSection)
+ .Case("eh_frame", &EHFrameSection)
.Case("debug_str", &StringSection)
.Case("debug_ranges", &RangeSection)
.Case("debug_macinfo", &MacinfoSection)
Modified: llvm/trunk/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp?rev=256008&r1=256007&r2=256008&view=diff
==============================================================================
--- llvm/trunk/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp (original)
+++ llvm/trunk/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp Fri Dec 18 12:51:08 2015
@@ -10,6 +10,7 @@
#include "llvm/DebugInfo/DWARF/DWARFDebugFrame.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/DataTypes.h"
@@ -191,19 +192,31 @@ public:
CIE(uint64_t Offset, uint64_t Length, uint8_t Version,
SmallString<8> Augmentation, uint8_t AddressSize,
uint8_t SegmentDescriptorSize, uint64_t CodeAlignmentFactor,
- int64_t DataAlignmentFactor, uint64_t ReturnAddressRegister)
+ int64_t DataAlignmentFactor, uint64_t ReturnAddressRegister,
+ SmallString<8> AugmentationData, Optional<uint32_t> FDEPointerEncoding,
+ Optional<uint32_t> LSDAPointerEncoding)
: FrameEntry(FK_CIE, Offset, Length), Version(Version),
Augmentation(std::move(Augmentation)),
AddressSize(AddressSize),
SegmentDescriptorSize(SegmentDescriptorSize),
CodeAlignmentFactor(CodeAlignmentFactor),
DataAlignmentFactor(DataAlignmentFactor),
- ReturnAddressRegister(ReturnAddressRegister) {}
+ ReturnAddressRegister(ReturnAddressRegister),
+ AugmentationData(AugmentationData),
+ FDEPointerEncoding(FDEPointerEncoding),
+ LSDAPointerEncoding(LSDAPointerEncoding) { }
~CIE() override {}
+ StringRef getAugmentationString() const { return Augmentation; }
uint64_t getCodeAlignmentFactor() const { return CodeAlignmentFactor; }
int64_t getDataAlignmentFactor() const { return DataAlignmentFactor; }
+ Optional<uint32_t> getFDEPointerEncoding() const {
+ return FDEPointerEncoding;
+ }
+ Optional<uint32_t> getLSDAPointerEncoding() const {
+ return LSDAPointerEncoding;
+ }
void dumpHeader(raw_ostream &OS) const override {
OS << format("%08x %08x %08x CIE",
@@ -223,6 +236,8 @@ public:
(int32_t)DataAlignmentFactor);
OS << format(" Return address column: %d\n",
(int32_t)ReturnAddressRegister);
+ if (!AugmentationData.empty())
+ OS << " Augmentation data: " << AugmentationData << "\n";
OS << "\n";
}
@@ -239,6 +254,11 @@ private:
uint64_t CodeAlignmentFactor;
int64_t DataAlignmentFactor;
uint64_t ReturnAddressRegister;
+
+ // The following are used when the CIE represents an EH frame entry.
+ SmallString<8> AugmentationData;
+ Optional<uint32_t> FDEPointerEncoding;
+ Optional<uint32_t> LSDAPointerEncoding;
};
@@ -423,7 +443,7 @@ void FrameEntry::dumpInstructions(raw_os
}
}
-DWARFDebugFrame::DWARFDebugFrame() {
+DWARFDebugFrame::DWARFDebugFrame(bool IsEH) : IsEH(IsEH) {
}
DWARFDebugFrame::~DWARFDebugFrame() {
@@ -439,6 +459,39 @@ static void LLVM_ATTRIBUTE_UNUSED dumpDa
errs() << "\n";
}
+static unsigned getSizeForEncoding(const DataExtractor &Data,
+ unsigned symbolEncoding) {
+ unsigned format = symbolEncoding & 0x0f;
+ switch (format) {
+ default: llvm_unreachable("Unknown Encoding");
+ case dwarf::DW_EH_PE_absptr:
+ case dwarf::DW_EH_PE_signed:
+ return Data.getAddressSize();
+ case dwarf::DW_EH_PE_udata2:
+ case dwarf::DW_EH_PE_sdata2:
+ return 2;
+ case dwarf::DW_EH_PE_udata4:
+ case dwarf::DW_EH_PE_sdata4:
+ return 4;
+ case dwarf::DW_EH_PE_udata8:
+ case dwarf::DW_EH_PE_sdata8:
+ return 8;
+ }
+}
+
+static uint64_t readPointer(const DataExtractor &Data, uint32_t &Offset,
+ unsigned Encoding) {
+ switch (getSizeForEncoding(Data, Encoding)) {
+ case 2:
+ return Data.getU16(&Offset);
+ case 4:
+ return Data.getU32(&Offset);
+ case 8:
+ return Data.getU64(&Offset);
+ default:
+ llvm_unreachable("Illegal data size");
+ }
+}
void DWARFDebugFrame::parse(DataExtractor Data) {
uint32_t Offset = 0;
@@ -447,6 +500,14 @@ void DWARFDebugFrame::parse(DataExtracto
while (Data.isValidOffset(Offset)) {
uint32_t StartOffset = Offset;
+ auto ReportError = [StartOffset](const char *ErrorMsg) {
+ std::string Str;
+ raw_string_ostream OS(Str);
+ OS << format(ErrorMsg, StartOffset);
+ OS.flush();
+ report_fatal_error(Str);
+ };
+
bool IsDWARF64 = false;
uint64_t Length = Data.getU32(&Offset);
uint64_t Id;
@@ -465,47 +526,136 @@ void DWARFDebugFrame::parse(DataExtracto
// read).
// TODO: For honest DWARF64 support, DataExtractor will have to treat
// offset_ptr as uint64_t*
+ uint32_t StartStructureOffset = Offset;
uint32_t EndStructureOffset = Offset + static_cast<uint32_t>(Length);
// The Id field's size depends on the DWARF format
- Id = Data.getUnsigned(&Offset, IsDWARF64 ? 8 : 4);
- bool IsCIE = ((IsDWARF64 && Id == DW64_CIE_ID) || Id == DW_CIE_ID);
+ Id = Data.getUnsigned(&Offset, (IsDWARF64 && !IsEH) ? 8 : 4);
+ bool IsCIE = ((IsDWARF64 && Id == DW64_CIE_ID) ||
+ Id == DW_CIE_ID ||
+ (IsEH && !Id));
if (IsCIE) {
uint8_t Version = Data.getU8(&Offset);
const char *Augmentation = Data.getCStr(&Offset);
- uint8_t AddressSize = Version < 4 ? Data.getAddressSize() : Data.getU8(&Offset);
+ StringRef AugmentationString(Augmentation ? Augmentation : "");
+ uint8_t AddressSize = Version < 4 ? Data.getAddressSize() :
+ Data.getU8(&Offset);
Data.setAddressSize(AddressSize);
uint8_t SegmentDescriptorSize = Version < 4 ? 0 : Data.getU8(&Offset);
uint64_t CodeAlignmentFactor = Data.getULEB128(&Offset);
int64_t DataAlignmentFactor = Data.getSLEB128(&Offset);
uint64_t ReturnAddressRegister = Data.getULEB128(&Offset);
+ // Parse the augmentation data for EH CIEs
+ StringRef AugmentationData;
+ Optional<uint32_t> FDEPointerEncoding;
+ Optional<uint32_t> LSDAPointerEncoding;
+ if (IsEH) {
+ Optional<uint32_t> PersonalityEncoding;
+ Optional<uint64_t> Personality;
+
+ uint64_t AugmentationLength = 0;
+ uint32_t StartAugmentationOffset = 0;
+ uint32_t EndAugmentationOffset = 0;
+
+ // Walk the augmentation string to get all the augmentation data.
+ for (unsigned i = 0, e = AugmentationString.size(); i != e; ++i) {
+ switch (AugmentationString[i]) {
+ default:
+ ReportError("Unknown augmentation character in entry at %lx");
+ case 'L':
+ if (LSDAPointerEncoding)
+ ReportError("Duplicate LSDA encoding in entry at %lx");
+ LSDAPointerEncoding = Data.getU8(&Offset);
+ break;
+ case 'P': {
+ if (Personality)
+ ReportError("Duplicate personality in entry at %lx");
+ PersonalityEncoding = Data.getU8(&Offset);
+ Personality = readPointer(Data, Offset, *PersonalityEncoding);
+ break;
+ }
+ case 'R':
+ if (FDEPointerEncoding)
+ ReportError("Duplicate FDE encoding in entry at %lx");
+ FDEPointerEncoding = Data.getU8(&Offset);
+ break;
+ case 'z':
+ if (i)
+ ReportError("'z' must be the first character at %lx");
+ // Parse the augmentation length first. We only parse it if
+ // the string contains a 'z'.
+ AugmentationLength = Data.getULEB128(&Offset);
+ StartAugmentationOffset = Offset;
+ EndAugmentationOffset =
+ Offset + static_cast<uint32_t>(AugmentationLength);
+ }
+ }
+
+ if (Offset != EndAugmentationOffset)
+ ReportError("Parsing augmentation data at %lx failed");
+
+ AugmentationData = Data.getData().slice(StartAugmentationOffset,
+ EndAugmentationOffset);
+ }
+
auto Cie = make_unique<CIE>(StartOffset, Length, Version,
StringRef(Augmentation), AddressSize,
SegmentDescriptorSize, CodeAlignmentFactor,
- DataAlignmentFactor, ReturnAddressRegister);
+ DataAlignmentFactor, ReturnAddressRegister,
+ AugmentationData, FDEPointerEncoding,
+ LSDAPointerEncoding);
CIEs[StartOffset] = Cie.get();
Entries.emplace_back(std::move(Cie));
} else {
// FDE
uint64_t CIEPointer = Id;
- uint64_t InitialLocation = Data.getAddress(&Offset);
- uint64_t AddressRange = Data.getAddress(&Offset);
+ uint64_t InitialLocation = 0;
+ uint64_t AddressRange = 0;
+ CIE *Cie = CIEs[IsEH ? (StartStructureOffset - CIEPointer) : CIEPointer];
+
+ if (IsEH) {
+ // The address size is encoded in the CIE we reference.
+ if (!Cie)
+ ReportError("Parsing FDE data at %lx failed due to missing CIE");
+
+ Optional<uint32_t> FDEPointerEncoding = Cie->getFDEPointerEncoding();
+ if (!FDEPointerEncoding)
+ ReportError("Parsing at %lx failed due to missing pointer encoding");
+
+ InitialLocation = readPointer(Data, Offset, *FDEPointerEncoding);
+ AddressRange = readPointer(Data, Offset, *FDEPointerEncoding);
+ StringRef AugmentationString = Cie->getAugmentationString();
+ if (!AugmentationString.empty()) {
+ // Parse the augmentation length and data for this FDE.
+ uint64_t AugmentationLength = Data.getULEB128(&Offset);
+
+ uint32_t EndAugmentationOffset =
+ Offset + static_cast<uint32_t>(AugmentationLength);
+
+ // Decode the LSDA if the CIE augmentation string said we should.
+ uint64_t LSDA = 0;
+ if (Optional<uint32_t> Encoding = Cie->getLSDAPointerEncoding())
+ LSDA = readPointer(Data, Offset, *Encoding);
+
+ if (Offset != EndAugmentationOffset)
+ ReportError("Parsing augmentation data at %lx failed");
+ }
+ } else {
+ InitialLocation = Data.getAddress(&Offset);
+ AddressRange = Data.getAddress(&Offset);
+ }
Entries.emplace_back(new FDE(StartOffset, Length, CIEPointer,
InitialLocation, AddressRange,
- CIEs[CIEPointer]));
+ Cie));
}
Entries.back()->parseInstructions(Data, &Offset, EndStructureOffset);
- if (Offset != EndStructureOffset) {
- std::string Str;
- raw_string_ostream OS(Str);
- OS << format("Parsing entry instructions at %lx failed", StartOffset);
- report_fatal_error(Str);
- }
+ if (Offset != EndStructureOffset)
+ ReportError("Parsing entry instructions at %lx failed");
}
}
Modified: llvm/trunk/lib/DebugInfo/PDB/PDBContext.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/DebugInfo/PDB/PDBContext.cpp?rev=256008&r1=256007&r2=256008&view=diff
==============================================================================
--- llvm/trunk/lib/DebugInfo/PDB/PDBContext.cpp (original)
+++ llvm/trunk/lib/DebugInfo/PDB/PDBContext.cpp Fri Dec 18 12:51:08 2015
@@ -28,7 +28,8 @@ PDBContext::PDBContext(const COFFObjectF
Session->setLoadAddress(ImageBase.get());
}
-void PDBContext::dump(raw_ostream &OS, DIDumpType DumpType) {}
+void PDBContext::dump(raw_ostream &OS, DIDumpType DumpType,
+ bool DumpEH) {}
DILineInfo PDBContext::getLineInfoForAddress(uint64_t Address,
DILineInfoSpecifier Specifier) {
Modified: llvm/trunk/test/tools/llvm-objdump/eh_frame-arm64.test
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/tools/llvm-objdump/eh_frame-arm64.test?rev=256008&r1=256007&r2=256008&view=diff
==============================================================================
--- llvm/trunk/test/tools/llvm-objdump/eh_frame-arm64.test (original)
+++ llvm/trunk/test/tools/llvm-objdump/eh_frame-arm64.test Fri Dec 18 12:51:08 2015
@@ -1,23 +1,23 @@
-# RUN: llvm-objdump -unwind-info %p/Inputs/eh_frame.macho-arm64 2>/dev/null | FileCheck %s
+# RUN: llvm-objdump -dwarf=frames %p/Inputs/eh_frame.macho-arm64 2>/dev/null | FileCheck %s
-# CHECK: Contents of __eh_frame section:
-# CHECK: CIE:
-# CHECK: Length: 16
-# CHECK: CIE ID: 0
-# CHECK: Version: 1
-# CHECK: Augmentation String: zR
-# CHECK: Code Alignment Factor: 1
-# CHECK: Data Alignment Factor: -8
-# CHECK: Return Address Register: 30
-# CHECK: Augmentation Data Length: 1
-# CHECK: FDE Address Pointer Encoding: 16
-# CHECK: Instructions:
-# CHECK: 0c 1f 00
-# CHECK: FDE:
-# CHECK: Length: 32
-# CHECK: CIE Offset: 0
-# CHECK: PC Begin: ffffffffffffffe4
-# CHECK: PC Range: 0000000000000020
-# CHECK: Augmentation Data Length: 0
-# CHECK: Instructions:
-# CHECK: 48 0e 10 9e 01 9d 02 00 00 00 00
+# CHECK: .eh_frame contents:
+
+# CHECK: 00000000 00000010 ffffffff CIE
+# CHECK: Version: 1
+# CHECK: Augmentation: "zR"
+# CHECK: Code alignment factor: 1
+# CHECK: Data alignment factor: -8
+# CHECK: Return address column: 30
+# CHECK: Augmentation data:
+
+# CHECK: DW_CFA_def_cfa: reg31 +0
+
+# CHECK: 00000014 00000020 00000018 FDE cie=00000018 pc=ffffffe4...00000004
+# CHECK: DW_CFA_advance_loc: 8
+# CHECK: DW_CFA_def_cfa_offset: +16
+# CHECK: DW_CFA_offset: reg30 -8
+# CHECK: DW_CFA_offset: reg29 -16
+# CHECK: DW_CFA_nop:
+# CHECK: DW_CFA_nop:
+# CHECK: DW_CFA_nop:
+# CHECK: DW_CFA_nop:
Modified: llvm/trunk/tools/llvm-objdump/MachODump.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/tools/llvm-objdump/MachODump.cpp?rev=256008&r1=256007&r2=256008&view=diff
==============================================================================
--- llvm/trunk/tools/llvm-objdump/MachODump.cpp (original)
+++ llvm/trunk/tools/llvm-objdump/MachODump.cpp Fri Dec 18 12:51:08 2015
@@ -1210,6 +1210,12 @@ static void ProcessMachO(StringRef Filen
printLazyBindTable(MachOOF);
if (WeakBind)
printWeakBindTable(MachOOF);
+
+ if (DwarfDumpType != DIDT_Null) {
+ std::unique_ptr<DIContext> DICtx(new DWARFContextInMemory(*MachOOF));
+ // Dump the complete DWARF structure.
+ DICtx->dump(outs(), DwarfDumpType, true /* DumpEH */);
+ }
}
// printUnknownCPUType() helps print_fat_headers for unknown CPU's.
@@ -6748,262 +6754,6 @@ static void printMachOUnwindInfoSection(
}
}
-static unsigned getSizeForEncoding(bool is64Bit,
- unsigned symbolEncoding) {
- unsigned format = symbolEncoding & 0x0f;
- switch (format) {
- default: llvm_unreachable("Unknown Encoding");
- case dwarf::DW_EH_PE_absptr:
- case dwarf::DW_EH_PE_signed:
- return is64Bit ? 8 : 4;
- case dwarf::DW_EH_PE_udata2:
- case dwarf::DW_EH_PE_sdata2:
- return 2;
- case dwarf::DW_EH_PE_udata4:
- case dwarf::DW_EH_PE_sdata4:
- return 4;
- case dwarf::DW_EH_PE_udata8:
- case dwarf::DW_EH_PE_sdata8:
- return 8;
- }
-}
-
-static uint64_t readPointer(const char *&Pos, bool is64Bit, unsigned Encoding) {
- switch (getSizeForEncoding(is64Bit, Encoding)) {
- case 2:
- return readNext<uint16_t>(Pos);
- break;
- case 4:
- return readNext<uint32_t>(Pos);
- break;
- case 8:
- return readNext<uint64_t>(Pos);
- break;
- default:
- llvm_unreachable("Illegal data size");
- }
-}
-
-static void printMachOEHFrameSection(const MachOObjectFile *Obj,
- std::map<uint64_t, SymbolRef> &Symbols,
- const SectionRef &EHFrame) {
- if (!Obj->isLittleEndian()) {
- outs() << "warning: cannot handle big endian __eh_frame section\n";
- return;
- }
-
- bool is64Bit = Obj->is64Bit();
-
- outs() << "Contents of __eh_frame section:\n";
-
- StringRef Contents;
- EHFrame.getContents(Contents);
-
- /// A few fields of the CIE are used when decoding the FDE's. This struct
- /// will cache those fields we need so that we don't have to decode it
- /// repeatedly for each FDE that references it.
- struct DecodedCIE {
- Optional<uint32_t> FDEPointerEncoding;
- Optional<uint32_t> LSDAPointerEncoding;
- bool hasAugmentationLength;
- };
-
- // Map from the start offset of the CIE to the cached data for that CIE.
- DenseMap<uint64_t, DecodedCIE> CachedCIEs;
-
- for (const char *Pos = Contents.data(), *End = Contents.end(); Pos != End; ) {
-
- const char *EntryStartPos = Pos;
-
- uint64_t Length = readNext<uint32_t>(Pos);
- if (Length == 0xffffffff)
- Length = readNext<uint64_t>(Pos);
-
- // Save the Pos so that we can check the length we encoded against what we
- // end up decoding.
- const char *PosAfterLength = Pos;
- const char *EntryEndPos = PosAfterLength + Length;
-
- assert(EntryEndPos <= End &&
- "__eh_frame entry length exceeds section size");
-
- uint32_t ID = readNext<uint32_t>(Pos);
- if (ID == 0) {
- // This is a CIE.
-
- uint32_t Version = readNext<uint8_t>(Pos);
-
- // Parse a null terminated augmentation string
- SmallString<8> AugmentationString;
- for (uint8_t Char = readNext<uint8_t>(Pos); Char;
- Char = readNext<uint8_t>(Pos))
- AugmentationString.push_back(Char);
-
- // Optionally parse the EH data if the augmentation string says it's there.
- Optional<uint64_t> EHData;
- if (StringRef(AugmentationString).count("eh"))
- EHData = is64Bit ? readNext<uint64_t>(Pos) : readNext<uint32_t>(Pos);
-
- unsigned ULEBByteCount;
- uint64_t CodeAlignmentFactor = decodeULEB128((const uint8_t *)Pos,
- &ULEBByteCount);
- Pos += ULEBByteCount;
-
- int64_t DataAlignmentFactor = decodeSLEB128((const uint8_t *)Pos,
- &ULEBByteCount);
- Pos += ULEBByteCount;
-
- uint32_t ReturnAddressRegister = readNext<uint8_t>(Pos);
-
- Optional<uint64_t> AugmentationLength;
- Optional<uint32_t> LSDAPointerEncoding;
- Optional<uint32_t> PersonalityEncoding;
- Optional<uint64_t> Personality;
- Optional<uint32_t> FDEPointerEncoding;
- if (!AugmentationString.empty() && AugmentationString.front() == 'z') {
- AugmentationLength = decodeULEB128((const uint8_t *)Pos,
- &ULEBByteCount);
- Pos += ULEBByteCount;
-
- // Walk the augmentation string to get all the augmentation data.
- for (unsigned i = 1, e = AugmentationString.size(); i != e; ++i) {
- char Char = AugmentationString[i];
- switch (Char) {
- case 'e':
- assert((i + 1) != e && AugmentationString[i + 1] == 'h' &&
- "Expected 'eh' in augmentation string");
- break;
- case 'L':
- assert(!LSDAPointerEncoding && "Duplicate LSDA encoding");
- LSDAPointerEncoding = readNext<uint8_t>(Pos);
- break;
- case 'P': {
- assert(!Personality && "Duplicate personality");
- PersonalityEncoding = readNext<uint8_t>(Pos);
- Personality = readPointer(Pos, is64Bit, *PersonalityEncoding);
- break;
- }
- case 'R':
- assert(!FDEPointerEncoding && "Duplicate FDE encoding");
- FDEPointerEncoding = readNext<uint8_t>(Pos);
- break;
- case 'z':
- llvm_unreachable("'z' must be first in the augmentation string");
- }
- }
- }
-
- outs() << "CIE:\n";
- outs() << " Length: " << Length << "\n";
- outs() << " CIE ID: " << ID << "\n";
- outs() << " Version: " << Version << "\n";
- outs() << " Augmentation String: " << AugmentationString << "\n";
- if (EHData)
- outs() << " EHData: " << *EHData << "\n";
- outs() << " Code Alignment Factor: " << CodeAlignmentFactor << "\n";
- outs() << " Data Alignment Factor: " << DataAlignmentFactor << "\n";
- outs() << " Return Address Register: " << ReturnAddressRegister << "\n";
- if (AugmentationLength) {
- outs() << " Augmentation Data Length: " << *AugmentationLength << "\n";
- if (LSDAPointerEncoding) {
- outs() << " FDE LSDA Pointer Encoding: "
- << *LSDAPointerEncoding << "\n";
- }
- if (Personality) {
- outs() << " Personality Encoding: " << *PersonalityEncoding << "\n";
- outs() << " Personality: " << *Personality << "\n";
- }
- if (FDEPointerEncoding) {
- outs() << " FDE Address Pointer Encoding: "
- << *FDEPointerEncoding << "\n";
- }
- }
- // FIXME: Handle instructions.
- // For now just emit some bytes
- outs() << " Instructions:\n ";
- dumpBytes(makeArrayRef((const uint8_t*)Pos, (const uint8_t*)EntryEndPos),
- outs());
- outs() << "\n";
- Pos = EntryEndPos;
-
- // Cache this entry.
- uint64_t Offset = EntryStartPos - Contents.data();
- CachedCIEs[Offset] = { FDEPointerEncoding, LSDAPointerEncoding,
- AugmentationLength.hasValue() };
- continue;
- }
-
- // This is an FDE.
- // The CIE pointer for an FDE is the same location as the ID which we
- // already read.
- uint32_t CIEPointer = ID;
-
- const char *CIEStart = PosAfterLength - CIEPointer;
- assert(CIEStart >= Contents.data() &&
- "FDE points to CIE before the __eh_frame start");
-
- uint64_t CIEOffset = CIEStart - Contents.data();
- auto CIEIt = CachedCIEs.find(CIEOffset);
- if (CIEIt == CachedCIEs.end())
- llvm_unreachable("Couldn't find CIE at offset in to __eh_frame section");
-
- const DecodedCIE &CIE = CIEIt->getSecond();
- assert(CIE.FDEPointerEncoding &&
- "FDE references CIE which did not set pointer encoding");
-
- uint64_t PCPointerSize = getSizeForEncoding(is64Bit,
- *CIE.FDEPointerEncoding);
-
- uint64_t PCBegin = readPointer(Pos, is64Bit, *CIE.FDEPointerEncoding);
- uint64_t PCRange = readPointer(Pos, is64Bit, *CIE.FDEPointerEncoding);
-
- Optional<uint64_t> AugmentationLength;
- uint32_t LSDAPointerSize;
- Optional<uint64_t> LSDAPointer;
- if (CIE.hasAugmentationLength) {
- unsigned ULEBByteCount;
- AugmentationLength = decodeULEB128((const uint8_t *)Pos,
- &ULEBByteCount);
- Pos += ULEBByteCount;
-
- // Decode the LSDA if the CIE augmentation string said we should.
- if (CIE.LSDAPointerEncoding) {
- LSDAPointerSize = getSizeForEncoding(is64Bit, *CIE.LSDAPointerEncoding);
- LSDAPointer = readPointer(Pos, is64Bit, *CIE.LSDAPointerEncoding);
- }
- }
-
- outs() << "FDE:\n";
- outs() << " Length: " << Length << "\n";
- outs() << " CIE Offset: " << CIEOffset << "\n";
-
- if (PCPointerSize == 8) {
- outs() << format(" PC Begin: %016" PRIx64, PCBegin) << "\n";
- outs() << format(" PC Range: %016" PRIx64, PCRange) << "\n";
- } else {
- outs() << format(" PC Begin: %08" PRIx64, PCBegin) << "\n";
- outs() << format(" PC Range: %08" PRIx64, PCRange) << "\n";
- }
- if (AugmentationLength) {
- outs() << " Augmentation Data Length: " << *AugmentationLength << "\n";
- if (LSDAPointer) {
- if (LSDAPointerSize == 8)
- outs() << format(" LSDA Pointer: %016\n" PRIx64, *LSDAPointer);
- else
- outs() << format(" LSDA Pointer: %08\n" PRIx64, *LSDAPointer);
- }
- }
-
- // FIXME: Handle instructions.
- // For now just emit some bytes
- outs() << " Instructions:\n ";
- dumpBytes(makeArrayRef((const uint8_t*)Pos, (const uint8_t*)EntryEndPos),
- outs());
- outs() << "\n";
- Pos = EntryEndPos;
- }
-}
-
void llvm::printMachOUnwindInfo(const MachOObjectFile *Obj) {
std::map<uint64_t, SymbolRef> Symbols;
for (const SymbolRef &SymRef : Obj->symbols()) {
@@ -7024,8 +6774,6 @@ void llvm::printMachOUnwindInfo(const Ma
printMachOCompactUnwindSection(Obj, Symbols, Section);
else if (SectName == "__unwind_info")
printMachOUnwindInfoSection(Obj, Symbols, Section);
- else if (SectName == "__eh_frame")
- printMachOEHFrameSection(Obj, Symbols, Section);
}
}
Modified: llvm/trunk/tools/llvm-objdump/llvm-objdump.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/tools/llvm-objdump/llvm-objdump.cpp?rev=256008&r1=256007&r2=256008&view=diff
==============================================================================
--- llvm/trunk/tools/llvm-objdump/llvm-objdump.cpp (original)
+++ llvm/trunk/tools/llvm-objdump/llvm-objdump.cpp Fri Dec 18 12:51:08 2015
@@ -22,6 +22,7 @@
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Triple.h"
#include "llvm/CodeGen/FaultMaps.h"
+#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDisassembler.h"
@@ -176,6 +177,11 @@ cl::opt<bool>
cl::opt<bool> PrintFaultMaps("fault-map-section",
cl::desc("Display contents of faultmap section"));
+cl::opt<DIDumpType> llvm::DwarfDumpType(
+ "dwarf", cl::init(DIDT_Null), cl::desc("Dump of dwarf debug sections:"),
+ cl::values(clEnumValN(DIDT_Frames, "frames", ".debug_frame"),
+ clEnumValEnd));
+
static StringRef ToolName;
namespace {
@@ -1572,6 +1578,11 @@ static void DumpObject(const ObjectFile
printRawClangAST(o);
if (PrintFaultMaps)
printFaultMaps(o);
+ if (DwarfDumpType != DIDT_Null) {
+ std::unique_ptr<DIContext> DICtx(new DWARFContextInMemory(*o));
+ // Dump the complete DWARF structure.
+ DICtx->dump(outs(), DwarfDumpType, true /* DumpEH */);
+ }
}
/// @brief Dump each object file in \a a;
@@ -1664,7 +1675,8 @@ int main(int argc, char **argv) {
&& !(DylibId && MachOOpt)
&& !(ObjcMetaData && MachOOpt)
&& !(FilterSections.size() != 0 && MachOOpt)
- && !PrintFaultMaps) {
+ && !PrintFaultMaps
+ && DwarfDumpType == DIDT_Null) {
cl::PrintHelpMessage();
return 2;
}
Modified: llvm/trunk/tools/llvm-objdump/llvm-objdump.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/tools/llvm-objdump/llvm-objdump.h?rev=256008&r1=256007&r2=256008&view=diff
==============================================================================
--- llvm/trunk/tools/llvm-objdump/llvm-objdump.h (original)
+++ llvm/trunk/tools/llvm-objdump/llvm-objdump.h Fri Dec 18 12:51:08 2015
@@ -10,6 +10,7 @@
#define LLVM_TOOLS_LLVM_OBJDUMP_LLVM_OBJDUMP_H
#include "llvm/ADT/StringRef.h"
+#include "llvm/DebugInfo/DIContext.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/DataTypes.h"
@@ -53,6 +54,7 @@ extern cl::opt<bool> SectionContents;
extern cl::opt<bool> SymbolTable;
extern cl::opt<bool> UnwindInfo;
extern cl::opt<bool> PrintImmHex;
+extern cl::opt<DIDumpType> DwarfDumpType;
// Various helper functions.
void error(std::error_code ec);
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