#include "DWARFDebugFrame.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/DataTypes.h"
-#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Dwarf.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include <string>
class llvm::FrameEntry {
public:
enum FrameKind {FK_CIE, FK_FDE};
- FrameEntry(FrameKind K, DataExtractor D, uint64_t Offset, uint64_t Length)
- : Kind(K), Data(D), Offset(Offset), Length(Length) {}
+ FrameEntry(FrameKind K, uint64_t Offset, uint64_t Length)
+ : Kind(K), Offset(Offset), Length(Length) {}
virtual ~FrameEntry() {
}
FrameKind getKind() const { return Kind; }
virtual uint64_t getOffset() const { return Offset; }
- /// \brief Parse and store a sequence of CFI instructions from our data
- /// stream, starting at Offset and ending at EndOffset. If everything
- /// goes well, Offset should be equal to EndOffset when this method
+ /// \brief Parse and store a sequence of CFI instructions from Data,
+ /// starting at *Offset and ending at EndOffset. If everything
+ /// goes well, *Offset should be equal to EndOffset when this method
/// returns. Otherwise, an error occurred.
- /// TODO: Improve error reporting...
- virtual void parseInstructions(uint32_t &Offset, uint32_t EndOffset);
+ virtual void parseInstructions(DataExtractor Data, uint32_t *Offset,
+ uint32_t EndOffset);
/// \brief Dump the entry header to the given output stream.
virtual void dumpHeader(raw_ostream &OS) const = 0;
protected:
const FrameKind Kind;
- /// \brief The data stream holding the section from which the entry was
- /// parsed.
- DataExtractor Data;
-
/// \brief Offset of this entry in the section.
uint64_t Offset;
const uint8_t DWARF_CFI_PRIMARY_OPCODE_MASK = 0xc0;
const uint8_t DWARF_CFI_PRIMARY_OPERAND_MASK = 0x3f;
-
-void FrameEntry::parseInstructions(uint32_t &Offset, uint32_t EndOffset) {
- while (Offset < EndOffset) {
- uint8_t Opcode = Data.getU8(&Offset);
+void FrameEntry::parseInstructions(DataExtractor Data, uint32_t *Offset,
+ uint32_t EndOffset) {
+ while (*Offset < EndOffset) {
+ uint8_t Opcode = Data.getU8(Offset);
// Some instructions have a primary opcode encoded in the top bits.
uint8_t Primary = Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK;
addInstruction(Primary, Op1);
break;
case DW_CFA_offset:
- addInstruction(Primary, Op1, Data.getULEB128(&Offset));
+ addInstruction(Primary, Op1, Data.getULEB128(Offset));
break;
}
} else {
case DW_CFA_nop:
case DW_CFA_remember_state:
case DW_CFA_restore_state:
+ case DW_CFA_GNU_window_save:
// No operands
addInstruction(Opcode);
break;
case DW_CFA_set_loc:
// Operands: Address
- addInstruction(Opcode, Data.getAddress(&Offset));
+ addInstruction(Opcode, Data.getAddress(Offset));
break;
case DW_CFA_advance_loc1:
// Operands: 1-byte delta
- addInstruction(Opcode, Data.getU8(&Offset));
+ addInstruction(Opcode, Data.getU8(Offset));
break;
case DW_CFA_advance_loc2:
// Operands: 2-byte delta
- addInstruction(Opcode, Data.getU16(&Offset));
+ addInstruction(Opcode, Data.getU16(Offset));
break;
case DW_CFA_advance_loc4:
// Operands: 4-byte delta
- addInstruction(Opcode, Data.getU32(&Offset));
+ addInstruction(Opcode, Data.getU32(Offset));
break;
case DW_CFA_restore_extended:
case DW_CFA_undefined:
case DW_CFA_def_cfa_register:
case DW_CFA_def_cfa_offset:
// Operands: ULEB128
- addInstruction(Opcode, Data.getULEB128(&Offset));
+ addInstruction(Opcode, Data.getULEB128(Offset));
break;
case DW_CFA_def_cfa_offset_sf:
// Operands: SLEB128
- addInstruction(Opcode, Data.getSLEB128(&Offset));
+ addInstruction(Opcode, Data.getSLEB128(Offset));
break;
case DW_CFA_offset_extended:
case DW_CFA_register:
case DW_CFA_def_cfa:
case DW_CFA_val_offset:
// Operands: ULEB128, ULEB128
- addInstruction(Opcode, Data.getULEB128(&Offset),
- Data.getULEB128(&Offset));
+ addInstruction(Opcode, Data.getULEB128(Offset),
+ Data.getULEB128(Offset));
break;
case DW_CFA_offset_extended_sf:
case DW_CFA_def_cfa_sf:
case DW_CFA_val_offset_sf:
// Operands: ULEB128, SLEB128
- addInstruction(Opcode, Data.getULEB128(&Offset),
- Data.getSLEB128(&Offset));
+ addInstruction(Opcode, Data.getULEB128(Offset),
+ Data.getSLEB128(Offset));
break;
case DW_CFA_def_cfa_expression:
case DW_CFA_expression:
void FrameEntry::dumpInstructions(raw_ostream &OS) const {
// TODO: at the moment only instruction names are dumped. Expand this to
// dump operands as well.
- for (std::vector<Instruction>::const_iterator I = Instructions.begin(),
- E = Instructions.end();
- I != E; ++I) {
- uint8_t Opcode = I->Opcode;
+ for (const auto &Instr : Instructions) {
+ uint8_t Opcode = Instr.Opcode;
if (Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK)
Opcode &= DWARF_CFI_PRIMARY_OPCODE_MASK;
OS << " " << CallFrameString(Opcode) << ":\n";
public:
// CIEs (and FDEs) are simply container classes, so the only sensible way to
// create them is by providing the full parsed contents in the constructor.
- CIE(DataExtractor D, uint64_t Offset, uint64_t Length, uint8_t Version,
+ CIE(uint64_t Offset, uint64_t Length, uint8_t Version,
SmallString<8> Augmentation, uint64_t CodeAlignmentFactor,
int64_t DataAlignmentFactor, uint64_t ReturnAddressRegister)
- : FrameEntry(FK_CIE, D, Offset, Length), Version(Version),
- Augmentation(Augmentation), CodeAlignmentFactor(CodeAlignmentFactor),
- DataAlignmentFactor(DataAlignmentFactor),
- ReturnAddressRegister(ReturnAddressRegister) {}
+ : FrameEntry(FK_CIE, Offset, Length), Version(Version),
+ Augmentation(Augmentation), CodeAlignmentFactor(CodeAlignmentFactor),
+ DataAlignmentFactor(DataAlignmentFactor),
+ ReturnAddressRegister(ReturnAddressRegister) {}
~CIE() {
}
- void dumpHeader(raw_ostream &OS) const {
+ void dumpHeader(raw_ostream &OS) const override {
OS << format("%08x %08x %08x CIE",
(uint32_t)Offset, (uint32_t)Length, DW_CIE_ID)
<< "\n";
static bool classof(const FrameEntry *FE) {
return FE->getKind() == FK_CIE;
- }
+ }
private:
/// The following fields are defined in section 6.4.1 of the DWARF standard v3
// Each FDE has a CIE it's "linked to". Our FDE contains is constructed with
// an offset to the CIE (provided by parsing the FDE header). The CIE itself
// is obtained lazily once it's actually required.
- FDE(DataExtractor D, uint64_t Offset, uint64_t Length,
- int64_t LinkedCIEOffset, uint64_t InitialLocation, uint64_t AddressRange)
- : FrameEntry(FK_FDE, D, Offset, Length), LinkedCIEOffset(LinkedCIEOffset),
- InitialLocation(InitialLocation), AddressRange(AddressRange),
- LinkedCIE(NULL) {}
+ FDE(uint64_t Offset, uint64_t Length, int64_t LinkedCIEOffset,
+ uint64_t InitialLocation, uint64_t AddressRange)
+ : FrameEntry(FK_FDE, Offset, Length), LinkedCIEOffset(LinkedCIEOffset),
+ InitialLocation(InitialLocation), AddressRange(AddressRange),
+ LinkedCIE(nullptr) {}
~FDE() {
}
- void dumpHeader(raw_ostream &OS) const {
+ void dumpHeader(raw_ostream &OS) const override {
OS << format("%08x %08x %08x FDE ",
(uint32_t)Offset, (uint32_t)Length, (int32_t)LinkedCIEOffset);
OS << format("cie=%08x pc=%08x...%08x\n",
static bool classof(const FrameEntry *FE) {
return FE->getKind() == FK_FDE;
- }
-private:
+ }
+private:
/// The following fields are defined in section 6.4.1 of the DWARF standard v3
uint64_t LinkedCIEOffset;
uint64_t InitialLocation;
DWARFDebugFrame::DWARFDebugFrame() {
}
-
DWARFDebugFrame::~DWARFDebugFrame() {
- for (EntryVector::iterator I = Entries.begin(), E = Entries.end();
- I != E; ++I) {
- delete *I;
- }
}
-
static void LLVM_ATTRIBUTE_UNUSED dumpDataAux(DataExtractor Data,
uint32_t Offset, int Length) {
errs() << "DUMP: ";
if (IsCIE) {
// Note: this is specifically DWARFv3 CIE header structure. It was
- // changed in DWARFv4.
+ // changed in DWARFv4. We currently don't support reading DWARFv4
+ // here because LLVM itself does not emit it (and LLDB doesn't
+ // support it either).
uint8_t Version = Data.getU8(&Offset);
const char *Augmentation = Data.getCStr(&Offset);
uint64_t CodeAlignmentFactor = Data.getULEB128(&Offset);
int64_t DataAlignmentFactor = Data.getSLEB128(&Offset);
uint64_t ReturnAddressRegister = Data.getULEB128(&Offset);
- CIE *NewCIE = new CIE(Data, StartOffset, Length, Version,
- StringRef(Augmentation), CodeAlignmentFactor,
- DataAlignmentFactor, ReturnAddressRegister);
- Entries.push_back(NewCIE);
+ Entries.emplace_back(new CIE(StartOffset, Length, Version,
+ StringRef(Augmentation), CodeAlignmentFactor,
+ DataAlignmentFactor, ReturnAddressRegister));
} else {
// FDE
uint64_t CIEPointer = Id;
uint64_t InitialLocation = Data.getAddress(&Offset);
uint64_t AddressRange = Data.getAddress(&Offset);
- FDE *NewFDE = new FDE(Data, StartOffset, Length, CIEPointer,
- InitialLocation, AddressRange);
- Entries.push_back(NewFDE);
+ Entries.emplace_back(new FDE(StartOffset, Length, CIEPointer,
+ InitialLocation, AddressRange));
}
- Entries.back()->parseInstructions(Offset, EndStructureOffset);
+ 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",
- Entries.back()->getOffset());
+ OS << format("Parsing entry instructions at %lx failed", StartOffset);
report_fatal_error(Str);
}
}
void DWARFDebugFrame::dump(raw_ostream &OS) const {
OS << "\n";
- for (EntryVector::const_iterator I = Entries.begin(), E = Entries.end();
- I != E; ++I) {
- FrameEntry *Entry = *I;
+ for (const auto &Entry : Entries) {
Entry->dumpHeader(OS);
Entry->dumpInstructions(OS);
OS << "\n";
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