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of lines which weren't being explicitly looked at and were printing incorrect results. These values clearly must lie within 32 bits, so the casts are definitely safe. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174717 91177308-0d34-0410-b5e6-96231b3b80d8
223 lines
6.9 KiB
C++
223 lines
6.9 KiB
C++
//===-- DWARFDebugFrame.h - Parsing of .debug_frame -------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "DWARFDebugFrame.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/Format.h"
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using namespace llvm;
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using namespace dwarf;
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/// \brief Abstract frame entry defining the common interface concrete
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/// entries implement.
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class llvm::FrameEntry {
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public:
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enum FrameKind {FK_CIE, FK_FDE};
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FrameEntry(FrameKind K, DataExtractor D, uint64_t Offset, uint64_t Length)
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: Kind(K), Data(D), Offset(Offset), Length(Length) {}
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virtual ~FrameEntry() {
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}
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FrameKind getKind() const { return Kind; }
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virtual void dumpHeader(raw_ostream &OS) const = 0;
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protected:
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const FrameKind Kind;
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/// \brief The data stream holding the section from which the entry was
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/// parsed.
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DataExtractor Data;
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/// \brief Offset of this entry in the section.
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uint64_t Offset;
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/// \brief Entry length as specified in DWARF.
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uint64_t Length;
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};
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/// \brief DWARF Common Information Entry (CIE)
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class CIE : public FrameEntry {
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public:
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// CIEs (and FDEs) are simply container classes, so the only sensible way to
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// create them is by providing the full parsed contents in the constructor.
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CIE(DataExtractor D, uint64_t Offset, uint64_t Length, uint8_t Version,
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SmallString<8> Augmentation, uint64_t CodeAlignmentFactor,
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int64_t DataAlignmentFactor, uint64_t ReturnAddressRegister)
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: FrameEntry(FK_CIE, D, Offset, Length), Version(Version),
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Augmentation(Augmentation), CodeAlignmentFactor(CodeAlignmentFactor),
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DataAlignmentFactor(DataAlignmentFactor),
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ReturnAddressRegister(ReturnAddressRegister) {}
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~CIE() {
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}
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void dumpHeader(raw_ostream &OS) const {
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OS << format("%08x %08x %08x CIE",
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(uint32_t)Offset, (uint32_t)Length, DW_CIE_ID)
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<< "\n";
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OS << format(" Version: %d\n", Version);
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OS << " Augmentation: \"" << Augmentation << "\"\n";
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OS << format(" Code alignment factor: %u\n", (uint32_t)CodeAlignmentFactor);
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OS << format(" Data alignment factor: %d\n", (int32_t)DataAlignmentFactor);
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OS << format(" Return address column: %d\n", (int32_t)ReturnAddressRegister);
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OS << "\n";
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}
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static bool classof(const FrameEntry *FE) {
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return FE->getKind() == FK_CIE;
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}
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private:
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/// The following fields are defined in section 6.4.1 of the DWARF standard v3
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uint8_t Version;
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SmallString<8> Augmentation;
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uint64_t CodeAlignmentFactor;
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int64_t DataAlignmentFactor;
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uint64_t ReturnAddressRegister;
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};
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/// \brief DWARF Frame Description Entry (FDE)
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class FDE : public FrameEntry {
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public:
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// Each FDE has a CIE it's "linked to". Our FDE contains is constructed with
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// an offset to the CIE (provided by parsing the FDE header). The CIE itself
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// is obtained lazily once it's actually required.
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FDE(DataExtractor D, uint64_t Offset, uint64_t Length,
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int64_t LinkedCIEOffset, uint64_t InitialLocation, uint64_t AddressRange)
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: FrameEntry(FK_FDE, D, Offset, Length), LinkedCIEOffset(LinkedCIEOffset),
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InitialLocation(InitialLocation), AddressRange(AddressRange),
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LinkedCIE(NULL) {}
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~FDE() {
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}
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void dumpHeader(raw_ostream &OS) const {
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OS << format("%08x %08x %08x FDE ",
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(uint32_t)Offset, (uint32_t)Length, (int32_t)LinkedCIEOffset);
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OS << format("cie=%08x pc=%08x...%08x\n",
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(int32_t)LinkedCIEOffset,
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(uint32_t)InitialLocation,
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(uint32_t)InitialLocation + (uint32_t)AddressRange);
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OS << "\n";
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if (LinkedCIE) {
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OS << format("%p\n", LinkedCIE);
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}
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}
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static bool classof(const FrameEntry *FE) {
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return FE->getKind() == FK_FDE;
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}
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private:
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/// The following fields are defined in section 6.4.1 of the DWARF standard v3
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uint64_t LinkedCIEOffset;
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uint64_t InitialLocation;
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uint64_t AddressRange;
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CIE *LinkedCIE;
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};
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DWARFDebugFrame::DWARFDebugFrame() {
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}
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DWARFDebugFrame::~DWARFDebugFrame() {
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for (EntryVector::iterator I = Entries.begin(), E = Entries.end();
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I != E; ++I) {
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delete *I;
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}
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}
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static void LLVM_ATTRIBUTE_UNUSED dumpDataAux(DataExtractor Data,
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uint32_t Offset, int Length) {
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errs() << "DUMP: ";
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for (int i = 0; i < Length; ++i) {
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uint8_t c = Data.getU8(&Offset);
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errs().write_hex(c); errs() << " ";
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}
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errs() << "\n";
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}
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void DWARFDebugFrame::parse(DataExtractor Data) {
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uint32_t Offset = 0;
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while (Data.isValidOffset(Offset)) {
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uint32_t StartOffset = Offset;
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bool IsDWARF64 = false;
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uint64_t Length = Data.getU32(&Offset);
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uint64_t Id;
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if (Length == UINT32_MAX) {
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// DWARF-64 is distinguished by the first 32 bits of the initial length
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// field being 0xffffffff. Then, the next 64 bits are the actual entry
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// length.
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IsDWARF64 = true;
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Length = Data.getU64(&Offset);
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}
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// At this point, Offset points to the next field after Length.
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// Length is the structure size excluding itself. Compute an offset one
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// past the end of the structure (needed to know how many instructions to
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// read).
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// TODO: For honest DWARF64 support, DataExtractor will have to treat
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// offset_ptr as uint64_t*
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uint32_t EndStructureOffset = Offset + static_cast<uint32_t>(Length);
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// The Id field's size depends on the DWARF format
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Id = Data.getUnsigned(&Offset, IsDWARF64 ? 8 : 4);
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bool IsCIE = ((IsDWARF64 && Id == DW64_CIE_ID) || Id == DW_CIE_ID);
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if (IsCIE) {
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// Note: this is specifically DWARFv3 CIE header structure. It was
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// changed in DWARFv4.
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uint8_t Version = Data.getU8(&Offset);
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const char *Augmentation = Data.getCStr(&Offset);
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uint64_t CodeAlignmentFactor = Data.getULEB128(&Offset);
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int64_t DataAlignmentFactor = Data.getSLEB128(&Offset);
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uint64_t ReturnAddressRegister = Data.getULEB128(&Offset);
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CIE *NewCIE = new CIE(Data, StartOffset, Length, Version,
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StringRef(Augmentation), CodeAlignmentFactor,
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DataAlignmentFactor, ReturnAddressRegister);
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Entries.push_back(NewCIE);
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} else {
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// FDE
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uint64_t CIEPointer = Id;
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uint64_t InitialLocation = Data.getAddress(&Offset);
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uint64_t AddressRange = Data.getAddress(&Offset);
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FDE *NewFDE = new FDE(Data, StartOffset, Length, CIEPointer,
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InitialLocation, AddressRange);
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Entries.push_back(NewFDE);
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}
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Offset = EndStructureOffset;
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}
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}
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void DWARFDebugFrame::dump(raw_ostream &OS) const {
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OS << "\n";
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for (EntryVector::const_iterator I = Entries.begin(), E = Entries.end();
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I != E; ++I) {
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(*I)->dumpHeader(OS);
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}
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}
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