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llvm-for-llvmta/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp

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//===- DWARFDebugFrame.h - Parsing of .debug_frame ------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/DWARF/DWARFDebugFrame.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <cinttypes>
#include <cstdint>
#include <string>
#include <vector>
using namespace llvm;
using namespace dwarf;
static void printRegister(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH,
unsigned RegNum) {
if (MRI) {
if (Optional<unsigned> LLVMRegNum = MRI->getLLVMRegNum(RegNum, IsEH)) {
if (const char *RegName = MRI->getName(*LLVMRegNum)) {
OS << RegName;
return;
}
}
}
OS << "reg" << RegNum;
}
// See DWARF standard v3, section 7.23
const uint8_t DWARF_CFI_PRIMARY_OPCODE_MASK = 0xc0;
const uint8_t DWARF_CFI_PRIMARY_OPERAND_MASK = 0x3f;
Error CFIProgram::parse(DWARFDataExtractor Data, uint64_t *Offset,
uint64_t EndOffset) {
DataExtractor::Cursor C(*Offset);
while (C && C.tell() < EndOffset) {
uint8_t Opcode = Data.getRelocatedValue(C, 1);
if (!C)
break;
// Some instructions have a primary opcode encoded in the top bits.
if (uint8_t Primary = Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK) {
// If it's a primary opcode, the first operand is encoded in the bottom
// bits of the opcode itself.
uint64_t Op1 = Opcode & DWARF_CFI_PRIMARY_OPERAND_MASK;
switch (Primary) {
case DW_CFA_advance_loc:
case DW_CFA_restore:
addInstruction(Primary, Op1);
break;
case DW_CFA_offset:
addInstruction(Primary, Op1, Data.getULEB128(C));
break;
default:
llvm_unreachable("invalid primary CFI opcode");
}
continue;
}
// Extended opcode - its value is Opcode itself.
switch (Opcode) {
default:
return createStringError(errc::illegal_byte_sequence,
"invalid extended CFI opcode 0x%" PRIx8, Opcode);
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.getRelocatedAddress(C));
break;
case DW_CFA_advance_loc1:
// Operands: 1-byte delta
addInstruction(Opcode, Data.getRelocatedValue(C, 1));
break;
case DW_CFA_advance_loc2:
// Operands: 2-byte delta
addInstruction(Opcode, Data.getRelocatedValue(C, 2));
break;
case DW_CFA_advance_loc4:
// Operands: 4-byte delta
addInstruction(Opcode, Data.getRelocatedValue(C, 4));
break;
case DW_CFA_restore_extended:
case DW_CFA_undefined:
case DW_CFA_same_value:
case DW_CFA_def_cfa_register:
case DW_CFA_def_cfa_offset:
case DW_CFA_GNU_args_size:
// Operands: ULEB128
addInstruction(Opcode, Data.getULEB128(C));
break;
case DW_CFA_def_cfa_offset_sf:
// Operands: SLEB128
addInstruction(Opcode, Data.getSLEB128(C));
break;
case DW_CFA_offset_extended:
case DW_CFA_register:
case DW_CFA_def_cfa:
case DW_CFA_val_offset: {
// Operands: ULEB128, ULEB128
// Note: We can not embed getULEB128 directly into function
// argument list. getULEB128 changes Offset and order of evaluation
// for arguments is unspecified.
uint64_t op1 = Data.getULEB128(C);
uint64_t op2 = Data.getULEB128(C);
addInstruction(Opcode, op1, op2);
break;
}
case DW_CFA_offset_extended_sf:
case DW_CFA_def_cfa_sf:
case DW_CFA_val_offset_sf: {
// Operands: ULEB128, SLEB128
// Note: see comment for the previous case
uint64_t op1 = Data.getULEB128(C);
uint64_t op2 = (uint64_t)Data.getSLEB128(C);
addInstruction(Opcode, op1, op2);
break;
}
case DW_CFA_def_cfa_expression: {
uint64_t ExprLength = Data.getULEB128(C);
addInstruction(Opcode, 0);
StringRef Expression = Data.getBytes(C, ExprLength);
DataExtractor Extractor(Expression, Data.isLittleEndian(),
Data.getAddressSize());
// Note. We do not pass the DWARF format to DWARFExpression, because
// DW_OP_call_ref, the only operation which depends on the format, is
// prohibited in call frame instructions, see sec. 6.4.2 in DWARFv5.
Instructions.back().Expression =
DWARFExpression(Extractor, Data.getAddressSize());
break;
}
case DW_CFA_expression:
case DW_CFA_val_expression: {
uint64_t RegNum = Data.getULEB128(C);
addInstruction(Opcode, RegNum, 0);
uint64_t BlockLength = Data.getULEB128(C);
StringRef Expression = Data.getBytes(C, BlockLength);
DataExtractor Extractor(Expression, Data.isLittleEndian(),
Data.getAddressSize());
// Note. We do not pass the DWARF format to DWARFExpression, because
// DW_OP_call_ref, the only operation which depends on the format, is
// prohibited in call frame instructions, see sec. 6.4.2 in DWARFv5.
Instructions.back().Expression =
DWARFExpression(Extractor, Data.getAddressSize());
break;
}
}
}
*Offset = C.tell();
return C.takeError();
}
namespace {
} // end anonymous namespace
ArrayRef<CFIProgram::OperandType[2]> CFIProgram::getOperandTypes() {
static OperandType OpTypes[DW_CFA_restore+1][2];
static bool Initialized = false;
if (Initialized) {
return ArrayRef<OperandType[2]>(&OpTypes[0], DW_CFA_restore+1);
}
Initialized = true;
#define DECLARE_OP2(OP, OPTYPE0, OPTYPE1) \
do { \
OpTypes[OP][0] = OPTYPE0; \
OpTypes[OP][1] = OPTYPE1; \
} while (false)
#define DECLARE_OP1(OP, OPTYPE0) DECLARE_OP2(OP, OPTYPE0, OT_None)
#define DECLARE_OP0(OP) DECLARE_OP1(OP, OT_None)
DECLARE_OP1(DW_CFA_set_loc, OT_Address);
DECLARE_OP1(DW_CFA_advance_loc, OT_FactoredCodeOffset);
DECLARE_OP1(DW_CFA_advance_loc1, OT_FactoredCodeOffset);
DECLARE_OP1(DW_CFA_advance_loc2, OT_FactoredCodeOffset);
DECLARE_OP1(DW_CFA_advance_loc4, OT_FactoredCodeOffset);
DECLARE_OP1(DW_CFA_MIPS_advance_loc8, OT_FactoredCodeOffset);
DECLARE_OP2(DW_CFA_def_cfa, OT_Register, OT_Offset);
DECLARE_OP2(DW_CFA_def_cfa_sf, OT_Register, OT_SignedFactDataOffset);
DECLARE_OP1(DW_CFA_def_cfa_register, OT_Register);
DECLARE_OP1(DW_CFA_def_cfa_offset, OT_Offset);
DECLARE_OP1(DW_CFA_def_cfa_offset_sf, OT_SignedFactDataOffset);
DECLARE_OP1(DW_CFA_def_cfa_expression, OT_Expression);
DECLARE_OP1(DW_CFA_undefined, OT_Register);
DECLARE_OP1(DW_CFA_same_value, OT_Register);
DECLARE_OP2(DW_CFA_offset, OT_Register, OT_UnsignedFactDataOffset);
DECLARE_OP2(DW_CFA_offset_extended, OT_Register, OT_UnsignedFactDataOffset);
DECLARE_OP2(DW_CFA_offset_extended_sf, OT_Register, OT_SignedFactDataOffset);
DECLARE_OP2(DW_CFA_val_offset, OT_Register, OT_UnsignedFactDataOffset);
DECLARE_OP2(DW_CFA_val_offset_sf, OT_Register, OT_SignedFactDataOffset);
DECLARE_OP2(DW_CFA_register, OT_Register, OT_Register);
DECLARE_OP2(DW_CFA_expression, OT_Register, OT_Expression);
DECLARE_OP2(DW_CFA_val_expression, OT_Register, OT_Expression);
DECLARE_OP1(DW_CFA_restore, OT_Register);
DECLARE_OP1(DW_CFA_restore_extended, OT_Register);
DECLARE_OP0(DW_CFA_remember_state);
DECLARE_OP0(DW_CFA_restore_state);
DECLARE_OP0(DW_CFA_GNU_window_save);
DECLARE_OP1(DW_CFA_GNU_args_size, OT_Offset);
DECLARE_OP0(DW_CFA_nop);
#undef DECLARE_OP0
#undef DECLARE_OP1
#undef DECLARE_OP2
return ArrayRef<OperandType[2]>(&OpTypes[0], DW_CFA_restore+1);
}
/// Print \p Opcode's operand number \p OperandIdx which has value \p Operand.
void CFIProgram::printOperand(raw_ostream &OS, DIDumpOptions DumpOpts,
const MCRegisterInfo *MRI, bool IsEH,
const Instruction &Instr, unsigned OperandIdx,
uint64_t Operand) const {
assert(OperandIdx < 2);
uint8_t Opcode = Instr.Opcode;
OperandType Type = getOperandTypes()[Opcode][OperandIdx];
switch (Type) {
case OT_Unset: {
OS << " Unsupported " << (OperandIdx ? "second" : "first") << " operand to";
auto OpcodeName = CallFrameString(Opcode, Arch);
if (!OpcodeName.empty())
OS << " " << OpcodeName;
else
OS << format(" Opcode %x", Opcode);
break;
}
case OT_None:
break;
case OT_Address:
OS << format(" %" PRIx64, Operand);
break;
case OT_Offset:
// The offsets are all encoded in a unsigned form, but in practice
// consumers use them signed. It's most certainly legacy due to
// the lack of signed variants in the first Dwarf standards.
OS << format(" %+" PRId64, int64_t(Operand));
break;
case OT_FactoredCodeOffset: // Always Unsigned
if (CodeAlignmentFactor)
OS << format(" %" PRId64, Operand * CodeAlignmentFactor);
else
OS << format(" %" PRId64 "*code_alignment_factor" , Operand);
break;
case OT_SignedFactDataOffset:
if (DataAlignmentFactor)
OS << format(" %" PRId64, int64_t(Operand) * DataAlignmentFactor);
else
OS << format(" %" PRId64 "*data_alignment_factor" , int64_t(Operand));
break;
case OT_UnsignedFactDataOffset:
if (DataAlignmentFactor)
OS << format(" %" PRId64, Operand * DataAlignmentFactor);
else
OS << format(" %" PRId64 "*data_alignment_factor" , Operand);
break;
case OT_Register:
OS << ' ';
printRegister(OS, MRI, IsEH, Operand);
break;
case OT_Expression:
assert(Instr.Expression && "missing DWARFExpression object");
OS << " ";
Instr.Expression->print(OS, DumpOpts, MRI, nullptr, IsEH);
break;
}
}
void CFIProgram::dump(raw_ostream &OS, DIDumpOptions DumpOpts,
const MCRegisterInfo *MRI, bool IsEH,
unsigned IndentLevel) const {
for (const auto &Instr : Instructions) {
uint8_t Opcode = Instr.Opcode;
if (Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK)
Opcode &= DWARF_CFI_PRIMARY_OPCODE_MASK;
OS.indent(2 * IndentLevel);
OS << CallFrameString(Opcode, Arch) << ":";
for (unsigned i = 0; i < Instr.Ops.size(); ++i)
printOperand(OS, DumpOpts, MRI, IsEH, Instr, i, Instr.Ops[i]);
OS << '\n';
}
}
// Returns the CIE identifier to be used by the requested format.
// CIE ids for .debug_frame sections are defined in Section 7.24 of DWARFv5.
// For CIE ID in .eh_frame sections see
// https://refspecs.linuxfoundation.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/ehframechpt.html
constexpr uint64_t getCIEId(bool IsDWARF64, bool IsEH) {
if (IsEH)
return 0;
if (IsDWARF64)
return DW64_CIE_ID;
return DW_CIE_ID;
}
void CIE::dump(raw_ostream &OS, DIDumpOptions DumpOpts,
const MCRegisterInfo *MRI, bool IsEH) const {
// A CIE with a zero length is a terminator entry in the .eh_frame section.
if (IsEH && Length == 0) {
OS << format("%08" PRIx64, Offset) << " ZERO terminator\n";
return;
}
OS << format("%08" PRIx64, Offset)
<< format(" %0*" PRIx64, IsDWARF64 ? 16 : 8, Length)
<< format(" %0*" PRIx64, IsDWARF64 && !IsEH ? 16 : 8,
getCIEId(IsDWARF64, IsEH))
<< " CIE\n"
<< " Format: " << FormatString(IsDWARF64) << "\n"
<< format(" Version: %d\n", Version)
<< " Augmentation: \"" << Augmentation << "\"\n";
if (Version >= 4) {
OS << format(" Address size: %u\n", (uint32_t)AddressSize);
OS << format(" Segment desc size: %u\n",
(uint32_t)SegmentDescriptorSize);
}
OS << format(" Code alignment factor: %u\n", (uint32_t)CodeAlignmentFactor);
OS << format(" Data alignment factor: %d\n", (int32_t)DataAlignmentFactor);
OS << format(" Return address column: %d\n", (int32_t)ReturnAddressRegister);
if (Personality)
OS << format(" Personality Address: %016" PRIx64 "\n", *Personality);
if (!AugmentationData.empty()) {
OS << " Augmentation data: ";
for (uint8_t Byte : AugmentationData)
OS << ' ' << hexdigit(Byte >> 4) << hexdigit(Byte & 0xf);
OS << "\n";
}
OS << "\n";
CFIs.dump(OS, DumpOpts, MRI, IsEH);
OS << "\n";
}
void FDE::dump(raw_ostream &OS, DIDumpOptions DumpOpts,
const MCRegisterInfo *MRI, bool IsEH) const {
OS << format("%08" PRIx64, Offset)
<< format(" %0*" PRIx64, IsDWARF64 ? 16 : 8, Length)
<< format(" %0*" PRIx64, IsDWARF64 && !IsEH ? 16 : 8, CIEPointer)
<< " FDE cie=";
if (LinkedCIE)
OS << format("%08" PRIx64, LinkedCIE->getOffset());
else
OS << "<invalid offset>";
OS << format(" pc=%08" PRIx64 "...%08" PRIx64 "\n", InitialLocation,
InitialLocation + AddressRange);
OS << " Format: " << FormatString(IsDWARF64) << "\n";
if (LSDAAddress)
OS << format(" LSDA Address: %016" PRIx64 "\n", *LSDAAddress);
CFIs.dump(OS, DumpOpts, MRI, IsEH);
OS << "\n";
}
DWARFDebugFrame::DWARFDebugFrame(Triple::ArchType Arch,
bool IsEH, uint64_t EHFrameAddress)
: Arch(Arch), IsEH(IsEH), EHFrameAddress(EHFrameAddress) {}
DWARFDebugFrame::~DWARFDebugFrame() = default;
static void LLVM_ATTRIBUTE_UNUSED dumpDataAux(DataExtractor Data,
uint64_t Offset, int Length) {
errs() << "DUMP: ";
for (int i = 0; i < Length; ++i) {
uint8_t c = Data.getU8(&Offset);
errs().write_hex(c); errs() << " ";
}
errs() << "\n";
}
Error DWARFDebugFrame::parse(DWARFDataExtractor Data) {
uint64_t Offset = 0;
DenseMap<uint64_t, CIE *> CIEs;
while (Data.isValidOffset(Offset)) {
uint64_t StartOffset = Offset;
uint64_t Length;
DwarfFormat Format;
std::tie(Length, Format) = Data.getInitialLength(&Offset);
bool IsDWARF64 = Format == DWARF64;
// If the Length is 0, then this CIE is a terminator. We add it because some
// dumper tools might need it to print something special for such entries
// (e.g. llvm-objdump --dwarf=frames prints "ZERO terminator").
if (Length == 0) {
auto Cie = std::make_unique<CIE>(
IsDWARF64, StartOffset, 0, 0, SmallString<8>(), 0, 0, 0, 0, 0,
SmallString<8>(), 0, 0, None, None, Arch);
CIEs[StartOffset] = Cie.get();
Entries.push_back(std::move(Cie));
break;
}
// At this point, Offset points to the next field after Length.
// Length is the structure size excluding itself. Compute an offset one
// past the end of the structure (needed to know how many instructions to
// read).
uint64_t StartStructureOffset = Offset;
uint64_t EndStructureOffset = Offset + Length;
// The Id field's size depends on the DWARF format
Error Err = Error::success();
uint64_t Id = Data.getRelocatedValue((IsDWARF64 && !IsEH) ? 8 : 4, &Offset,
/*SectionIndex=*/nullptr, &Err);
if (Err)
return Err;
if (Id == getCIEId(IsDWARF64, IsEH)) {
uint8_t Version = Data.getU8(&Offset);
const char *Augmentation = Data.getCStr(&Offset);
StringRef AugmentationString(Augmentation ? Augmentation : "");
// TODO: we should provide a way to report a warning and continue dumping.
if (IsEH && Version != 1)
return createStringError(errc::not_supported,
"unsupported CIE version: %" PRIu8, Version);
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 =
Version == 1 ? Data.getU8(&Offset) : Data.getULEB128(&Offset);
// Parse the augmentation data for EH CIEs
StringRef AugmentationData("");
uint32_t FDEPointerEncoding = DW_EH_PE_absptr;
uint32_t LSDAPointerEncoding = DW_EH_PE_omit;
Optional<uint64_t> Personality;
Optional<uint32_t> PersonalityEncoding;
if (IsEH) {
Optional<uint64_t> AugmentationLength;
uint64_t StartAugmentationOffset;
uint64_t EndAugmentationOffset;
// Walk the augmentation string to get all the augmentation data.
for (unsigned i = 0, e = AugmentationString.size(); i != e; ++i) {
switch (AugmentationString[i]) {
default:
return createStringError(
errc::invalid_argument,
"unknown augmentation character in entry at 0x%" PRIx64,
StartOffset);
case 'L':
LSDAPointerEncoding = Data.getU8(&Offset);
break;
case 'P': {
if (Personality)
return createStringError(
errc::invalid_argument,
"duplicate personality in entry at 0x%" PRIx64, StartOffset);
PersonalityEncoding = Data.getU8(&Offset);
Personality = Data.getEncodedPointer(
&Offset, *PersonalityEncoding,
EHFrameAddress ? EHFrameAddress + Offset : 0);
break;
}
case 'R':
FDEPointerEncoding = Data.getU8(&Offset);
break;
case 'S':
// Current frame is a signal trampoline.
break;
case 'z':
if (i)
return createStringError(
errc::invalid_argument,
"'z' must be the first character at 0x%" PRIx64, StartOffset);
// Parse the augmentation length first. We only parse it if
// the string contains a 'z'.
AugmentationLength = Data.getULEB128(&Offset);
StartAugmentationOffset = Offset;
EndAugmentationOffset = Offset + *AugmentationLength;
break;
case 'B':
// B-Key is used for signing functions associated with this
// augmentation string
break;
}
}
if (AugmentationLength.hasValue()) {
if (Offset != EndAugmentationOffset)
return createStringError(errc::invalid_argument,
"parsing augmentation data at 0x%" PRIx64
" failed",
StartOffset);
AugmentationData = Data.getData().slice(StartAugmentationOffset,
EndAugmentationOffset);
}
}
auto Cie = std::make_unique<CIE>(
IsDWARF64, StartOffset, Length, Version, AugmentationString,
AddressSize, SegmentDescriptorSize, CodeAlignmentFactor,
DataAlignmentFactor, ReturnAddressRegister, AugmentationData,
FDEPointerEncoding, LSDAPointerEncoding, Personality,
PersonalityEncoding, Arch);
CIEs[StartOffset] = Cie.get();
Entries.emplace_back(std::move(Cie));
} else {
// FDE
uint64_t CIEPointer = Id;
uint64_t InitialLocation = 0;
uint64_t AddressRange = 0;
Optional<uint64_t> LSDAAddress;
CIE *Cie = CIEs[IsEH ? (StartStructureOffset - CIEPointer) : CIEPointer];
if (IsEH) {
// The address size is encoded in the CIE we reference.
if (!Cie)
return createStringError(errc::invalid_argument,
"parsing FDE data at 0x%" PRIx64
" failed due to missing CIE",
StartOffset);
if (auto Val =
Data.getEncodedPointer(&Offset, Cie->getFDEPointerEncoding(),
EHFrameAddress + Offset)) {
InitialLocation = *Val;
}
if (auto Val = Data.getEncodedPointer(
&Offset, Cie->getFDEPointerEncoding(), 0)) {
AddressRange = *Val;
}
StringRef AugmentationString = Cie->getAugmentationString();
if (!AugmentationString.empty()) {
// Parse the augmentation length and data for this FDE.
uint64_t AugmentationLength = Data.getULEB128(&Offset);
uint64_t EndAugmentationOffset = Offset + AugmentationLength;
// Decode the LSDA if the CIE augmentation string said we should.
if (Cie->getLSDAPointerEncoding() != DW_EH_PE_omit) {
LSDAAddress = Data.getEncodedPointer(
&Offset, Cie->getLSDAPointerEncoding(),
EHFrameAddress ? Offset + EHFrameAddress : 0);
}
if (Offset != EndAugmentationOffset)
return createStringError(errc::invalid_argument,
"parsing augmentation data at 0x%" PRIx64
" failed",
StartOffset);
}
} else {
InitialLocation = Data.getRelocatedAddress(&Offset);
AddressRange = Data.getRelocatedAddress(&Offset);
}
Entries.emplace_back(new FDE(IsDWARF64, StartOffset, Length, CIEPointer,
InitialLocation, AddressRange, Cie,
LSDAAddress, Arch));
}
if (Error E =
Entries.back()->cfis().parse(Data, &Offset, EndStructureOffset))
return E;
if (Offset != EndStructureOffset)
return createStringError(
errc::invalid_argument,
"parsing entry instructions at 0x%" PRIx64 " failed", StartOffset);
}
return Error::success();
}
FrameEntry *DWARFDebugFrame::getEntryAtOffset(uint64_t Offset) const {
auto It = partition_point(Entries, [=](const std::unique_ptr<FrameEntry> &E) {
return E->getOffset() < Offset;
});
if (It != Entries.end() && (*It)->getOffset() == Offset)
return It->get();
return nullptr;
}
void DWARFDebugFrame::dump(raw_ostream &OS, DIDumpOptions DumpOpts,
const MCRegisterInfo *MRI,
Optional<uint64_t> Offset) const {
if (Offset) {
if (auto *Entry = getEntryAtOffset(*Offset))
Entry->dump(OS, DumpOpts, MRI, IsEH);
return;
}
OS << "\n";
for (const auto &Entry : Entries)
Entry->dump(OS, DumpOpts, MRI, IsEH);
}
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