[llvm] aca3e70 - DWARFDebugLine.cpp: Restore LF line endings
Hubert Tong via llvm-commits
llvm-commits at lists.llvm.org
Tue Jan 14 18:24:26 PST 2020
Author: Hubert Tong
Date: 2020-01-14T21:23:39-05:00
New Revision: aca3e70d2bc0dd89b7d486c2a8eac70d8a89e790
URL: https://github.com/llvm/llvm-project/commit/aca3e70d2bc0dd89b7d486c2a8eac70d8a89e790
DIFF: https://github.com/llvm/llvm-project/commit/aca3e70d2bc0dd89b7d486c2a8eac70d8a89e790.diff
LOG: DWARFDebugLine.cpp: Restore LF line endings
rG7e02406f6cf180a8c89ce64665660e7cc9dbc23e switched the file to CRLF
line endings.
Added:
Modified:
llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
Removed:
################################################################################
diff --git a/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp b/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
index 795a26d91a57..11adb1e47640 100644
--- a/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
+++ b/llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
@@ -1,1188 +1,1188 @@
-//===- DWARFDebugLine.cpp -------------------------------------------------===//
-//
-// 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/DWARFDebugLine.h"
-#include "llvm/ADT/Optional.h"
-#include "llvm/ADT/SmallString.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/BinaryFormat/Dwarf.h"
-#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
-#include "llvm/DebugInfo/DWARF/DWARFRelocMap.h"
-#include "llvm/Support/Errc.h"
-#include "llvm/Support/Format.h"
-#include "llvm/Support/WithColor.h"
-#include "llvm/Support/raw_ostream.h"
-#include <algorithm>
-#include <cassert>
-#include <cinttypes>
-#include <cstdint>
-#include <cstdio>
-#include <utility>
-
-using namespace llvm;
-using namespace dwarf;
-
-using FileLineInfoKind = DILineInfoSpecifier::FileLineInfoKind;
-
-namespace {
-
-struct ContentDescriptor {
- dwarf::LineNumberEntryFormat Type;
- dwarf::Form Form;
-};
-
-using ContentDescriptors = SmallVector<ContentDescriptor, 4>;
-
-} // end anonymous namespace
-
-void DWARFDebugLine::ContentTypeTracker::trackContentType(
- dwarf::LineNumberEntryFormat ContentType) {
- switch (ContentType) {
- case dwarf::DW_LNCT_timestamp:
- HasModTime = true;
- break;
- case dwarf::DW_LNCT_size:
- HasLength = true;
- break;
- case dwarf::DW_LNCT_MD5:
- HasMD5 = true;
- break;
- case dwarf::DW_LNCT_LLVM_source:
- HasSource = true;
- break;
- default:
- // We only care about values we consider optional, and new values may be
- // added in the vendor extension range, so we do not match exhaustively.
- break;
- }
-}
-
-DWARFDebugLine::Prologue::Prologue() { clear(); }
-
-bool DWARFDebugLine::Prologue::hasFileAtIndex(uint64_t FileIndex) const {
- uint16_t DwarfVersion = getVersion();
- assert(DwarfVersion != 0 &&
- "line table prologue has no dwarf version information");
- if (DwarfVersion >= 5)
- return FileIndex < FileNames.size();
- return FileIndex != 0 && FileIndex <= FileNames.size();
-}
-
-const llvm::DWARFDebugLine::FileNameEntry &
-DWARFDebugLine::Prologue::getFileNameEntry(uint64_t Index) const {
- uint16_t DwarfVersion = getVersion();
- assert(DwarfVersion != 0 &&
- "line table prologue has no dwarf version information");
- // In DWARF v5 the file names are 0-indexed.
- if (DwarfVersion >= 5)
- return FileNames[Index];
- return FileNames[Index - 1];
-}
-
-void DWARFDebugLine::Prologue::clear() {
- TotalLength = PrologueLength = 0;
- SegSelectorSize = 0;
- MinInstLength = MaxOpsPerInst = DefaultIsStmt = LineBase = LineRange = 0;
- OpcodeBase = 0;
- FormParams = dwarf::FormParams({0, 0, DWARF32});
- ContentTypes = ContentTypeTracker();
- StandardOpcodeLengths.clear();
- IncludeDirectories.clear();
- FileNames.clear();
-}
-
-void DWARFDebugLine::Prologue::dump(raw_ostream &OS,
- DIDumpOptions DumpOptions) const {
- OS << "Line table prologue:\n"
- << format(" total_length: 0x%8.8" PRIx64 "\n", TotalLength)
- << format(" version: %u\n", getVersion());
- if (getVersion() >= 5)
- OS << format(" address_size: %u\n", getAddressSize())
- << format(" seg_select_size: %u\n", SegSelectorSize);
- OS << format(" prologue_length: 0x%8.8" PRIx64 "\n", PrologueLength)
- << format(" min_inst_length: %u\n", MinInstLength)
- << format(getVersion() >= 4 ? "max_ops_per_inst: %u\n" : "", MaxOpsPerInst)
- << format(" default_is_stmt: %u\n", DefaultIsStmt)
- << format(" line_base: %i\n", LineBase)
- << format(" line_range: %u\n", LineRange)
- << format(" opcode_base: %u\n", OpcodeBase);
-
- for (uint32_t I = 0; I != StandardOpcodeLengths.size(); ++I)
- OS << format("standard_opcode_lengths[%s] = %u\n",
- LNStandardString(I + 1).data(), StandardOpcodeLengths[I]);
-
- if (!IncludeDirectories.empty()) {
- // DWARF v5 starts directory indexes at 0.
- uint32_t DirBase = getVersion() >= 5 ? 0 : 1;
- for (uint32_t I = 0; I != IncludeDirectories.size(); ++I) {
- OS << format("include_directories[%3u] = ", I + DirBase);
- IncludeDirectories[I].dump(OS, DumpOptions);
- OS << '\n';
- }
- }
-
- if (!FileNames.empty()) {
- // DWARF v5 starts file indexes at 0.
- uint32_t FileBase = getVersion() >= 5 ? 0 : 1;
- for (uint32_t I = 0; I != FileNames.size(); ++I) {
- const FileNameEntry &FileEntry = FileNames[I];
- OS << format("file_names[%3u]:\n", I + FileBase);
- OS << " name: ";
- FileEntry.Name.dump(OS, DumpOptions);
- OS << '\n'
- << format(" dir_index: %" PRIu64 "\n", FileEntry.DirIdx);
- if (ContentTypes.HasMD5)
- OS << " md5_checksum: " << FileEntry.Checksum.digest() << '\n';
- if (ContentTypes.HasModTime)
- OS << format(" mod_time: 0x%8.8" PRIx64 "\n", FileEntry.ModTime);
- if (ContentTypes.HasLength)
- OS << format(" length: 0x%8.8" PRIx64 "\n", FileEntry.Length);
- if (ContentTypes.HasSource) {
- OS << " source: ";
- FileEntry.Source.dump(OS, DumpOptions);
- OS << '\n';
- }
- }
- }
-}
-
-// Parse v2-v4 directory and file tables.
-static void
-parseV2DirFileTables(const DWARFDataExtractor &DebugLineData,
- uint64_t *OffsetPtr, uint64_t EndPrologueOffset,
- DWARFDebugLine::ContentTypeTracker &ContentTypes,
- std::vector<DWARFFormValue> &IncludeDirectories,
- std::vector<DWARFDebugLine::FileNameEntry> &FileNames) {
- while (*OffsetPtr < EndPrologueOffset) {
- StringRef S = DebugLineData.getCStrRef(OffsetPtr);
- if (S.empty())
- break;
- DWARFFormValue Dir =
- DWARFFormValue::createFromPValue(dwarf::DW_FORM_string, S.data());
- IncludeDirectories.push_back(Dir);
- }
-
- while (*OffsetPtr < EndPrologueOffset) {
- StringRef Name = DebugLineData.getCStrRef(OffsetPtr);
- if (Name.empty())
- break;
- DWARFDebugLine::FileNameEntry FileEntry;
- FileEntry.Name =
- DWARFFormValue::createFromPValue(dwarf::DW_FORM_string, Name.data());
- FileEntry.DirIdx = DebugLineData.getULEB128(OffsetPtr);
- FileEntry.ModTime = DebugLineData.getULEB128(OffsetPtr);
- FileEntry.Length = DebugLineData.getULEB128(OffsetPtr);
- FileNames.push_back(FileEntry);
- }
-
- ContentTypes.HasModTime = true;
- ContentTypes.HasLength = true;
-}
-
-// Parse v5 directory/file entry content descriptions.
-// Returns the descriptors, or an error if we did not find a path or ran off
-// the end of the prologue.
-static llvm::Expected<ContentDescriptors>
-parseV5EntryFormat(const DWARFDataExtractor &DebugLineData, uint64_t *OffsetPtr,
- DWARFDebugLine::ContentTypeTracker *ContentTypes) {
- ContentDescriptors Descriptors;
- int FormatCount = DebugLineData.getU8(OffsetPtr);
- bool HasPath = false;
- for (int I = 0; I != FormatCount; ++I) {
- ContentDescriptor Descriptor;
- Descriptor.Type =
- dwarf::LineNumberEntryFormat(DebugLineData.getULEB128(OffsetPtr));
- Descriptor.Form = dwarf::Form(DebugLineData.getULEB128(OffsetPtr));
- if (Descriptor.Type == dwarf::DW_LNCT_path)
- HasPath = true;
- if (ContentTypes)
- ContentTypes->trackContentType(Descriptor.Type);
- Descriptors.push_back(Descriptor);
- }
-
- if (!HasPath)
- return createStringError(errc::invalid_argument,
- "failed to parse entry content descriptions"
- " because no path was found");
- return Descriptors;
-}
-
-static Error
-parseV5DirFileTables(const DWARFDataExtractor &DebugLineData,
- uint64_t *OffsetPtr, const dwarf::FormParams &FormParams,
- const DWARFContext &Ctx, const DWARFUnit *U,
- DWARFDebugLine::ContentTypeTracker &ContentTypes,
- std::vector<DWARFFormValue> &IncludeDirectories,
- std::vector<DWARFDebugLine::FileNameEntry> &FileNames) {
- // Get the directory entry description.
- llvm::Expected<ContentDescriptors> DirDescriptors =
- parseV5EntryFormat(DebugLineData, OffsetPtr, nullptr);
- if (!DirDescriptors)
- return DirDescriptors.takeError();
-
- // Get the directory entries, according to the format described above.
- int DirEntryCount = DebugLineData.getU8(OffsetPtr);
- for (int I = 0; I != DirEntryCount; ++I) {
- for (auto Descriptor : *DirDescriptors) {
- DWARFFormValue Value(Descriptor.Form);
- switch (Descriptor.Type) {
- case DW_LNCT_path:
- if (!Value.extractValue(DebugLineData, OffsetPtr, FormParams, &Ctx, U))
- return createStringError(errc::invalid_argument,
- "failed to parse directory entry because "
- "extracting the form value failed.");
- IncludeDirectories.push_back(Value);
- break;
- default:
- if (!Value.skipValue(DebugLineData, OffsetPtr, FormParams))
- return createStringError(errc::invalid_argument,
- "failed to parse directory entry because "
- "skipping the form value failed.");
- }
- }
- }
-
- // Get the file entry description.
- llvm::Expected<ContentDescriptors> FileDescriptors =
- parseV5EntryFormat(DebugLineData, OffsetPtr, &ContentTypes);
- if (!FileDescriptors)
- return FileDescriptors.takeError();
-
- // Get the file entries, according to the format described above.
- int FileEntryCount = DebugLineData.getU8(OffsetPtr);
- for (int I = 0; I != FileEntryCount; ++I) {
- DWARFDebugLine::FileNameEntry FileEntry;
- for (auto Descriptor : *FileDescriptors) {
- DWARFFormValue Value(Descriptor.Form);
- if (!Value.extractValue(DebugLineData, OffsetPtr, FormParams, &Ctx, U))
- return createStringError(errc::invalid_argument,
- "failed to parse file entry because "
- "extracting the form value failed.");
- switch (Descriptor.Type) {
- case DW_LNCT_path:
- FileEntry.Name = Value;
- break;
- case DW_LNCT_LLVM_source:
- FileEntry.Source = Value;
- break;
- case DW_LNCT_directory_index:
- FileEntry.DirIdx = Value.getAsUnsignedConstant().getValue();
- break;
- case DW_LNCT_timestamp:
- FileEntry.ModTime = Value.getAsUnsignedConstant().getValue();
- break;
- case DW_LNCT_size:
- FileEntry.Length = Value.getAsUnsignedConstant().getValue();
- break;
- case DW_LNCT_MD5:
- if (!Value.getAsBlock() || Value.getAsBlock().getValue().size() != 16)
- return createStringError(
- errc::invalid_argument,
- "failed to parse file entry because the MD5 hash is invalid");
- std::uninitialized_copy_n(Value.getAsBlock().getValue().begin(), 16,
- FileEntry.Checksum.Bytes.begin());
- break;
- default:
- break;
- }
- }
- FileNames.push_back(FileEntry);
- }
- return Error::success();
-}
-
-Error DWARFDebugLine::Prologue::parse(const DWARFDataExtractor &DebugLineData,
- uint64_t *OffsetPtr,
- const DWARFContext &Ctx,
- const DWARFUnit *U) {
- const uint64_t PrologueOffset = *OffsetPtr;
-
- clear();
- TotalLength = DebugLineData.getRelocatedValue(4, OffsetPtr);
- if (TotalLength == dwarf::DW_LENGTH_DWARF64) {
- FormParams.Format = dwarf::DWARF64;
- TotalLength = DebugLineData.getU64(OffsetPtr);
- } else if (TotalLength >= dwarf::DW_LENGTH_lo_reserved) {
- return createStringError(errc::invalid_argument,
- "parsing line table prologue at offset 0x%8.8" PRIx64
- " unsupported reserved unit length found of value 0x%8.8" PRIx64,
- PrologueOffset, TotalLength);
- }
- FormParams.Version = DebugLineData.getU16(OffsetPtr);
- if (getVersion() < 2)
- return createStringError(errc::not_supported,
- "parsing line table prologue at offset 0x%8.8" PRIx64
- " found unsupported version 0x%2.2" PRIx16,
- PrologueOffset, getVersion());
-
- if (getVersion() >= 5) {
- FormParams.AddrSize = DebugLineData.getU8(OffsetPtr);
- assert((DebugLineData.getAddressSize() == 0 ||
- DebugLineData.getAddressSize() == getAddressSize()) &&
- "Line table header and data extractor disagree");
- SegSelectorSize = DebugLineData.getU8(OffsetPtr);
- }
-
- PrologueLength =
- DebugLineData.getRelocatedValue(sizeofPrologueLength(), OffsetPtr);
- const uint64_t EndPrologueOffset = PrologueLength + *OffsetPtr;
- MinInstLength = DebugLineData.getU8(OffsetPtr);
- if (getVersion() >= 4)
- MaxOpsPerInst = DebugLineData.getU8(OffsetPtr);
- DefaultIsStmt = DebugLineData.getU8(OffsetPtr);
- LineBase = DebugLineData.getU8(OffsetPtr);
- LineRange = DebugLineData.getU8(OffsetPtr);
- OpcodeBase = DebugLineData.getU8(OffsetPtr);
-
- StandardOpcodeLengths.reserve(OpcodeBase - 1);
- for (uint32_t I = 1; I < OpcodeBase; ++I) {
- uint8_t OpLen = DebugLineData.getU8(OffsetPtr);
- StandardOpcodeLengths.push_back(OpLen);
- }
-
- if (getVersion() >= 5) {
- if (Error E =
- parseV5DirFileTables(DebugLineData, OffsetPtr, FormParams, Ctx, U,
- ContentTypes, IncludeDirectories, FileNames)) {
- return joinErrors(
- createStringError(
- errc::invalid_argument,
- "parsing line table prologue at 0x%8.8" PRIx64
- " found an invalid directory or file table description at"
- " 0x%8.8" PRIx64,
- PrologueOffset, *OffsetPtr),
- std::move(E));
- }
- } else
- parseV2DirFileTables(DebugLineData, OffsetPtr, EndPrologueOffset,
- ContentTypes, IncludeDirectories, FileNames);
-
- if (*OffsetPtr != EndPrologueOffset)
- return createStringError(errc::invalid_argument,
- "parsing line table prologue at 0x%8.8" PRIx64
- " should have ended at 0x%8.8" PRIx64
- " but it ended at 0x%8.8" PRIx64,
- PrologueOffset, EndPrologueOffset, *OffsetPtr);
- return Error::success();
-}
-
-DWARFDebugLine::Row::Row(bool DefaultIsStmt) { reset(DefaultIsStmt); }
-
-void DWARFDebugLine::Row::postAppend() {
- Discriminator = 0;
- BasicBlock = false;
- PrologueEnd = false;
- EpilogueBegin = false;
-}
-
-void DWARFDebugLine::Row::reset(bool DefaultIsStmt) {
- Address.Address = 0;
- Address.SectionIndex = object::SectionedAddress::UndefSection;
- Line = 1;
- Column = 0;
- File = 1;
- Isa = 0;
- Discriminator = 0;
- IsStmt = DefaultIsStmt;
- BasicBlock = false;
- EndSequence = false;
- PrologueEnd = false;
- EpilogueBegin = false;
-}
-
-void DWARFDebugLine::Row::dumpTableHeader(raw_ostream &OS) {
- OS << "Address Line Column File ISA Discriminator Flags\n"
- << "------------------ ------ ------ ------ --- ------------- "
- "-------------\n";
-}
-
-void DWARFDebugLine::Row::dump(raw_ostream &OS) const {
- OS << format("0x%16.16" PRIx64 " %6u %6u", Address.Address, Line, Column)
- << format(" %6u %3u %13u ", File, Isa, Discriminator)
- << (IsStmt ? " is_stmt" : "") << (BasicBlock ? " basic_block" : "")
- << (PrologueEnd ? " prologue_end" : "")
- << (EpilogueBegin ? " epilogue_begin" : "")
- << (EndSequence ? " end_sequence" : "") << '\n';
-}
-
-DWARFDebugLine::Sequence::Sequence() { reset(); }
-
-void DWARFDebugLine::Sequence::reset() {
- LowPC = 0;
- HighPC = 0;
- SectionIndex = object::SectionedAddress::UndefSection;
- FirstRowIndex = 0;
- LastRowIndex = 0;
- Empty = true;
-}
-
-DWARFDebugLine::LineTable::LineTable() { clear(); }
-
-void DWARFDebugLine::LineTable::dump(raw_ostream &OS,
- DIDumpOptions DumpOptions) const {
- Prologue.dump(OS, DumpOptions);
-
- if (!Rows.empty()) {
- OS << '\n';
- Row::dumpTableHeader(OS);
- for (const Row &R : Rows) {
- R.dump(OS);
- }
- }
-
- // Terminate the table with a final blank line to clearly delineate it from
- // later dumps.
- OS << '\n';
-}
-
-void DWARFDebugLine::LineTable::clear() {
- Prologue.clear();
- Rows.clear();
- Sequences.clear();
-}
-
-DWARFDebugLine::ParsingState::ParsingState(struct LineTable *LT)
- : LineTable(LT) {
- resetRowAndSequence();
-}
-
-void DWARFDebugLine::ParsingState::resetRowAndSequence() {
- Row.reset(LineTable->Prologue.DefaultIsStmt);
- Sequence.reset();
-}
-
-void DWARFDebugLine::ParsingState::appendRowToMatrix() {
- unsigned RowNumber = LineTable->Rows.size();
- if (Sequence.Empty) {
- // Record the beginning of instruction sequence.
- Sequence.Empty = false;
- Sequence.LowPC = Row.Address.Address;
- Sequence.FirstRowIndex = RowNumber;
- }
- LineTable->appendRow(Row);
- if (Row.EndSequence) {
- // Record the end of instruction sequence.
- Sequence.HighPC = Row.Address.Address;
- Sequence.LastRowIndex = RowNumber + 1;
- Sequence.SectionIndex = Row.Address.SectionIndex;
- if (Sequence.isValid())
- LineTable->appendSequence(Sequence);
- Sequence.reset();
- }
- Row.postAppend();
-}
-
-const DWARFDebugLine::LineTable *
-DWARFDebugLine::getLineTable(uint64_t Offset) const {
- LineTableConstIter Pos = LineTableMap.find(Offset);
- if (Pos != LineTableMap.end())
- return &Pos->second;
- return nullptr;
-}
-
-Expected<const DWARFDebugLine::LineTable *> DWARFDebugLine::getOrParseLineTable(
- DWARFDataExtractor &DebugLineData, uint64_t Offset, const DWARFContext &Ctx,
- const DWARFUnit *U, function_ref<void(Error)> RecoverableErrorCallback) {
- if (!DebugLineData.isValidOffset(Offset))
- return createStringError(errc::invalid_argument, "offset 0x%8.8" PRIx64
- " is not a valid debug line section offset",
- Offset);
-
- std::pair<LineTableIter, bool> Pos =
- LineTableMap.insert(LineTableMapTy::value_type(Offset, LineTable()));
- LineTable *LT = &Pos.first->second;
- if (Pos.second) {
- if (Error Err =
- LT->parse(DebugLineData, &Offset, Ctx, U, RecoverableErrorCallback))
- return std::move(Err);
- return LT;
- }
- return LT;
-}
-
-Error DWARFDebugLine::LineTable::parse(
- DWARFDataExtractor &DebugLineData, uint64_t *OffsetPtr,
- const DWARFContext &Ctx, const DWARFUnit *U,
- function_ref<void(Error)> RecoverableErrorCallback, raw_ostream *OS) {
- const uint64_t DebugLineOffset = *OffsetPtr;
-
- clear();
-
- Error PrologueErr = Prologue.parse(DebugLineData, OffsetPtr, Ctx, U);
-
- if (OS) {
- // The presence of OS signals verbose dumping.
- DIDumpOptions DumpOptions;
- DumpOptions.Verbose = true;
- Prologue.dump(*OS, DumpOptions);
- }
-
- if (PrologueErr)
- return PrologueErr;
-
- uint64_t ProgramLength = Prologue.TotalLength + Prologue.sizeofTotalLength();
- if (!DebugLineData.isValidOffsetForDataOfSize(DebugLineOffset,
- ProgramLength)) {
- assert(DebugLineData.size() > DebugLineOffset &&
- "prologue parsing should handle invalid offset");
- uint64_t BytesRemaining = DebugLineData.size() - DebugLineOffset;
- RecoverableErrorCallback(
- createStringError(errc::invalid_argument,
- "line table program with offset 0x%8.8" PRIx64
- " has length 0x%8.8" PRIx64 " but only 0x%8.8" PRIx64
- " bytes are available",
- DebugLineOffset, ProgramLength, BytesRemaining));
- // Continue by capping the length at the number of remaining bytes.
- ProgramLength = BytesRemaining;
- }
-
- const uint64_t EndOffset = DebugLineOffset + ProgramLength;
-
- // See if we should tell the data extractor the address size.
- if (DebugLineData.getAddressSize() == 0)
- DebugLineData.setAddressSize(Prologue.getAddressSize());
- else
- assert(Prologue.getAddressSize() == 0 ||
- Prologue.getAddressSize() == DebugLineData.getAddressSize());
-
- ParsingState State(this);
-
- while (*OffsetPtr < EndOffset) {
- if (OS)
- *OS << format("0x%08.08" PRIx64 ": ", *OffsetPtr);
-
- uint8_t Opcode = DebugLineData.getU8(OffsetPtr);
-
- if (OS)
- *OS << format("%02.02" PRIx8 " ", Opcode);
-
- if (Opcode == 0) {
- // Extended Opcodes always start with a zero opcode followed by
- // a uleb128 length so you can skip ones you don't know about
- uint64_t Len = DebugLineData.getULEB128(OffsetPtr);
- uint64_t ExtOffset = *OffsetPtr;
-
- // Tolerate zero-length; assume length is correct and soldier on.
- if (Len == 0) {
- if (OS)
- *OS << "Badly formed extended line op (length 0)\n";
- continue;
- }
-
- uint8_t SubOpcode = DebugLineData.getU8(OffsetPtr);
- if (OS)
- *OS << LNExtendedString(SubOpcode);
- switch (SubOpcode) {
- case DW_LNE_end_sequence:
- // Set the end_sequence register of the state machine to true and
- // append a row to the matrix using the current values of the
- // state-machine registers. Then reset the registers to the initial
- // values specified above. Every statement program sequence must end
- // with a DW_LNE_end_sequence instruction which creates a row whose
- // address is that of the byte after the last target machine instruction
- // of the sequence.
- State.Row.EndSequence = true;
- if (OS) {
- *OS << "\n";
- OS->indent(12);
- State.Row.dump(*OS);
- }
- State.appendRowToMatrix();
- State.resetRowAndSequence();
- break;
-
- case DW_LNE_set_address:
- // Takes a single relocatable address as an operand. The size of the
- // operand is the size appropriate to hold an address on the target
- // machine. Set the address register to the value given by the
- // relocatable address. All of the other statement program opcodes
- // that affect the address register add a delta to it. This instruction
- // stores a relocatable value into it instead.
- //
- // Make sure the extractor knows the address size. If not, infer it
- // from the size of the operand.
- {
- uint8_t ExtractorAddressSize = DebugLineData.getAddressSize();
- if (ExtractorAddressSize != Len - 1 && ExtractorAddressSize != 0)
- RecoverableErrorCallback(createStringError(
- errc::invalid_argument,
- "mismatching address size at offset 0x%8.8" PRIx64
- " expected 0x%2.2" PRIx8 " found 0x%2.2" PRIx64,
- ExtOffset, ExtractorAddressSize, Len - 1));
-
- // Assume that the line table is correct and temporarily override the
- // address size.
- DebugLineData.setAddressSize(Len - 1);
- State.Row.Address.Address = DebugLineData.getRelocatedAddress(
- OffsetPtr, &State.Row.Address.SectionIndex);
-
- // Restore the address size if the extractor already had it.
- if (ExtractorAddressSize != 0)
- DebugLineData.setAddressSize(ExtractorAddressSize);
-
- if (OS)
- *OS << format(" (0x%16.16" PRIx64 ")", State.Row.Address.Address);
- }
- break;
-
- case DW_LNE_define_file:
- // Takes 4 arguments. The first is a null terminated string containing
- // a source file name. The second is an unsigned LEB128 number
- // representing the directory index of the directory in which the file
- // was found. The third is an unsigned LEB128 number representing the
- // time of last modification of the file. The fourth is an unsigned
- // LEB128 number representing the length in bytes of the file. The time
- // and length fields may contain LEB128(0) if the information is not
- // available.
- //
- // The directory index represents an entry in the include_directories
- // section of the statement program prologue. The index is LEB128(0)
- // if the file was found in the current directory of the compilation,
- // LEB128(1) if it was found in the first directory in the
- // include_directories section, and so on. The directory index is
- // ignored for file names that represent full path names.
- //
- // The files are numbered, starting at 1, in the order in which they
- // appear; the names in the prologue come before names defined by
- // the DW_LNE_define_file instruction. These numbers are used in the
- // the file register of the state machine.
- {
- FileNameEntry FileEntry;
- const char *Name = DebugLineData.getCStr(OffsetPtr);
- FileEntry.Name =
- DWARFFormValue::createFromPValue(dwarf::DW_FORM_string, Name);
- FileEntry.DirIdx = DebugLineData.getULEB128(OffsetPtr);
- FileEntry.ModTime = DebugLineData.getULEB128(OffsetPtr);
- FileEntry.Length = DebugLineData.getULEB128(OffsetPtr);
- Prologue.FileNames.push_back(FileEntry);
- if (OS)
- *OS << " (" << Name << ", dir=" << FileEntry.DirIdx << ", mod_time="
- << format("(0x%16.16" PRIx64 ")", FileEntry.ModTime)
- << ", length=" << FileEntry.Length << ")";
- }
- break;
-
- case DW_LNE_set_discriminator:
- State.Row.Discriminator = DebugLineData.getULEB128(OffsetPtr);
- if (OS)
- *OS << " (" << State.Row.Discriminator << ")";
- break;
-
- default:
- if (OS)
- *OS << format("Unrecognized extended op 0x%02.02" PRIx8, SubOpcode)
- << format(" length %" PRIx64, Len);
- // Len doesn't include the zero opcode byte or the length itself, but
- // it does include the sub_opcode, so we have to adjust for that.
- (*OffsetPtr) += Len - 1;
- break;
- }
- // Make sure the stated and parsed lengths are the same.
- // Otherwise we have an unparseable line-number program.
- if (*OffsetPtr - ExtOffset != Len)
- return createStringError(errc::illegal_byte_sequence,
- "unexpected line op length at offset 0x%8.8" PRIx64
- " expected 0x%2.2" PRIx64 " found 0x%2.2" PRIx64,
- ExtOffset, Len, *OffsetPtr - ExtOffset);
- } else if (Opcode < Prologue.OpcodeBase) {
- if (OS)
- *OS << LNStandardString(Opcode);
- switch (Opcode) {
- // Standard Opcodes
- case DW_LNS_copy:
- // Takes no arguments. Append a row to the matrix using the
- // current values of the state-machine registers.
- if (OS) {
- *OS << "\n";
- OS->indent(12);
- State.Row.dump(*OS);
- *OS << "\n";
- }
- State.appendRowToMatrix();
- break;
-
- case DW_LNS_advance_pc:
- // Takes a single unsigned LEB128 operand, multiplies it by the
- // min_inst_length field of the prologue, and adds the
- // result to the address register of the state machine.
- {
- uint64_t AddrOffset =
- DebugLineData.getULEB128(OffsetPtr) * Prologue.MinInstLength;
- State.Row.Address.Address += AddrOffset;
- if (OS)
- *OS << " (" << AddrOffset << ")";
- }
- break;
-
- case DW_LNS_advance_line:
- // Takes a single signed LEB128 operand and adds that value to
- // the line register of the state machine.
- State.Row.Line += DebugLineData.getSLEB128(OffsetPtr);
- if (OS)
- *OS << " (" << State.Row.Line << ")";
- break;
-
- case DW_LNS_set_file:
- // Takes a single unsigned LEB128 operand and stores it in the file
- // register of the state machine.
- State.Row.File = DebugLineData.getULEB128(OffsetPtr);
- if (OS)
- *OS << " (" << State.Row.File << ")";
- break;
-
- case DW_LNS_set_column:
- // Takes a single unsigned LEB128 operand and stores it in the
- // column register of the state machine.
- State.Row.Column = DebugLineData.getULEB128(OffsetPtr);
- if (OS)
- *OS << " (" << State.Row.Column << ")";
- break;
-
- case DW_LNS_negate_stmt:
- // Takes no arguments. Set the is_stmt register of the state
- // machine to the logical negation of its current value.
- State.Row.IsStmt = !State.Row.IsStmt;
- break;
-
- case DW_LNS_set_basic_block:
- // Takes no arguments. Set the basic_block register of the
- // state machine to true
- State.Row.BasicBlock = true;
- break;
-
- case DW_LNS_const_add_pc:
- // Takes no arguments. Add to the address register of the state
- // machine the address increment value corresponding to special
- // opcode 255. The motivation for DW_LNS_const_add_pc is this:
- // when the statement program needs to advance the address by a
- // small amount, it can use a single special opcode, which occupies
- // a single byte. When it needs to advance the address by up to
- // twice the range of the last special opcode, it can use
- // DW_LNS_const_add_pc followed by a special opcode, for a total
- // of two bytes. Only if it needs to advance the address by more
- // than twice that range will it need to use both DW_LNS_advance_pc
- // and a special opcode, requiring three or more bytes.
- {
- uint8_t AdjustOpcode = 255 - Prologue.OpcodeBase;
- uint64_t AddrOffset =
- (AdjustOpcode / Prologue.LineRange) * Prologue.MinInstLength;
- State.Row.Address.Address += AddrOffset;
- if (OS)
- *OS
- << format(" (0x%16.16" PRIx64 ")", AddrOffset);
- }
- break;
-
- case DW_LNS_fixed_advance_pc:
- // Takes a single uhalf operand. Add to the address register of
- // the state machine the value of the (unencoded) operand. This
- // is the only extended opcode that takes an argument that is not
- // a variable length number. The motivation for DW_LNS_fixed_advance_pc
- // is this: existing assemblers cannot emit DW_LNS_advance_pc or
- // special opcodes because they cannot encode LEB128 numbers or
- // judge when the computation of a special opcode overflows and
- // requires the use of DW_LNS_advance_pc. Such assemblers, however,
- // can use DW_LNS_fixed_advance_pc instead, sacrificing compression.
- {
- uint16_t PCOffset = DebugLineData.getRelocatedValue(2, OffsetPtr);
- State.Row.Address.Address += PCOffset;
- if (OS)
- *OS
- << format(" (0x%4.4" PRIx16 ")", PCOffset);
- }
- break;
-
- case DW_LNS_set_prologue_end:
- // Takes no arguments. Set the prologue_end register of the
- // state machine to true
- State.Row.PrologueEnd = true;
- break;
-
- case DW_LNS_set_epilogue_begin:
- // Takes no arguments. Set the basic_block register of the
- // state machine to true
- State.Row.EpilogueBegin = true;
- break;
-
- case DW_LNS_set_isa:
- // Takes a single unsigned LEB128 operand and stores it in the
- // column register of the state machine.
- State.Row.Isa = DebugLineData.getULEB128(OffsetPtr);
- if (OS)
- *OS << " (" << (uint64_t)State.Row.Isa << ")";
- break;
-
- default:
- // Handle any unknown standard opcodes here. We know the lengths
- // of such opcodes because they are specified in the prologue
- // as a multiple of LEB128 operands for each opcode.
- {
- assert(Opcode - 1U < Prologue.StandardOpcodeLengths.size());
- uint8_t OpcodeLength = Prologue.StandardOpcodeLengths[Opcode - 1];
- for (uint8_t I = 0; I < OpcodeLength; ++I) {
- uint64_t Value = DebugLineData.getULEB128(OffsetPtr);
- if (OS)
- *OS << format("Skipping ULEB128 value: 0x%16.16" PRIx64 ")\n",
- Value);
- }
- }
- break;
- }
- } else {
- // Special Opcodes
-
- // A special opcode value is chosen based on the amount that needs
- // to be added to the line and address registers. The maximum line
- // increment for a special opcode is the value of the line_base
- // field in the header, plus the value of the line_range field,
- // minus 1 (line base + line range - 1). If the desired line
- // increment is greater than the maximum line increment, a standard
- // opcode must be used instead of a special opcode. The "address
- // advance" is calculated by dividing the desired address increment
- // by the minimum_instruction_length field from the header. The
- // special opcode is then calculated using the following formula:
- //
- // opcode = (desired line increment - line_base) +
- // (line_range * address advance) + opcode_base
- //
- // If the resulting opcode is greater than 255, a standard opcode
- // must be used instead.
- //
- // To decode a special opcode, subtract the opcode_base from the
- // opcode itself to give the adjusted opcode. The amount to
- // increment the address register is the result of the adjusted
- // opcode divided by the line_range multiplied by the
- // minimum_instruction_length field from the header. That is:
- //
- // address increment = (adjusted opcode / line_range) *
- // minimum_instruction_length
- //
- // The amount to increment the line register is the line_base plus
- // the result of the adjusted opcode modulo the line_range. That is:
- //
- // line increment = line_base + (adjusted opcode % line_range)
-
- uint8_t AdjustOpcode = Opcode - Prologue.OpcodeBase;
- uint64_t AddrOffset =
- (AdjustOpcode / Prologue.LineRange) * Prologue.MinInstLength;
- int32_t LineOffset =
- Prologue.LineBase + (AdjustOpcode % Prologue.LineRange);
- State.Row.Line += LineOffset;
- State.Row.Address.Address += AddrOffset;
-
- if (OS) {
- *OS << "address += " << AddrOffset << ", line += " << LineOffset
- << "\n";
- OS->indent(12);
- State.Row.dump(*OS);
- }
-
- State.appendRowToMatrix();
- }
- if(OS)
- *OS << "\n";
- }
-
- if (!State.Sequence.Empty)
- RecoverableErrorCallback(createStringError(
- errc::illegal_byte_sequence,
- "last sequence in debug line table at offset 0x%8.8" PRIx64
- " is not terminated",
- DebugLineOffset));
-
- // Sort all sequences so that address lookup will work faster.
- if (!Sequences.empty()) {
- llvm::sort(Sequences, Sequence::orderByHighPC);
- // Note: actually, instruction address ranges of sequences should not
- // overlap (in shared objects and executables). If they do, the address
- // lookup would still work, though, but result would be ambiguous.
- // We don't report warning in this case. For example,
- // sometimes .so compiled from multiple object files contains a few
- // rudimentary sequences for address ranges [0x0, 0xsomething).
- }
-
- return Error::success();
-}
-
-uint32_t DWARFDebugLine::LineTable::findRowInSeq(
- const DWARFDebugLine::Sequence &Seq,
- object::SectionedAddress Address) const {
- if (!Seq.containsPC(Address))
- return UnknownRowIndex;
- assert(Seq.SectionIndex == Address.SectionIndex);
- // In some cases, e.g. first instruction in a function, the compiler generates
- // two entries, both with the same address. We want the last one.
- //
- // In general we want a non-empty range: the last row whose address is less
- // than or equal to Address. This can be computed as upper_bound - 1.
- DWARFDebugLine::Row Row;
- Row.Address = Address;
- RowIter FirstRow = Rows.begin() + Seq.FirstRowIndex;
- RowIter LastRow = Rows.begin() + Seq.LastRowIndex;
- assert(FirstRow->Address.Address <= Row.Address.Address &&
- Row.Address.Address < LastRow[-1].Address.Address);
- RowIter RowPos = std::upper_bound(FirstRow + 1, LastRow - 1, Row,
- DWARFDebugLine::Row::orderByAddress) -
- 1;
- assert(Seq.SectionIndex == RowPos->Address.SectionIndex);
- return RowPos - Rows.begin();
-}
-
-uint32_t DWARFDebugLine::LineTable::lookupAddress(
- object::SectionedAddress Address) const {
-
- // Search for relocatable addresses
- uint32_t Result = lookupAddressImpl(Address);
-
- if (Result != UnknownRowIndex ||
- Address.SectionIndex == object::SectionedAddress::UndefSection)
- return Result;
-
- // Search for absolute addresses
- Address.SectionIndex = object::SectionedAddress::UndefSection;
- return lookupAddressImpl(Address);
-}
-
-uint32_t DWARFDebugLine::LineTable::lookupAddressImpl(
- object::SectionedAddress Address) const {
- // First, find an instruction sequence containing the given address.
- DWARFDebugLine::Sequence Sequence;
- Sequence.SectionIndex = Address.SectionIndex;
- Sequence.HighPC = Address.Address;
- SequenceIter It = llvm::upper_bound(Sequences, Sequence,
- DWARFDebugLine::Sequence::orderByHighPC);
- if (It == Sequences.end() || It->SectionIndex != Address.SectionIndex)
- return UnknownRowIndex;
- return findRowInSeq(*It, Address);
-}
-
-bool DWARFDebugLine::LineTable::lookupAddressRange(
- object::SectionedAddress Address, uint64_t Size,
- std::vector<uint32_t> &Result) const {
-
- // Search for relocatable addresses
- if (lookupAddressRangeImpl(Address, Size, Result))
- return true;
-
- if (Address.SectionIndex == object::SectionedAddress::UndefSection)
- return false;
-
- // Search for absolute addresses
- Address.SectionIndex = object::SectionedAddress::UndefSection;
- return lookupAddressRangeImpl(Address, Size, Result);
-}
-
-bool DWARFDebugLine::LineTable::lookupAddressRangeImpl(
- object::SectionedAddress Address, uint64_t Size,
- std::vector<uint32_t> &Result) const {
- if (Sequences.empty())
- return false;
- uint64_t EndAddr = Address.Address + Size;
- // First, find an instruction sequence containing the given address.
- DWARFDebugLine::Sequence Sequence;
- Sequence.SectionIndex = Address.SectionIndex;
- Sequence.HighPC = Address.Address;
- SequenceIter LastSeq = Sequences.end();
- SequenceIter SeqPos = llvm::upper_bound(
- Sequences, Sequence, DWARFDebugLine::Sequence::orderByHighPC);
- if (SeqPos == LastSeq || !SeqPos->containsPC(Address))
- return false;
-
- SequenceIter StartPos = SeqPos;
-
- // Add the rows from the first sequence to the vector, starting with the
- // index we just calculated
-
- while (SeqPos != LastSeq && SeqPos->LowPC < EndAddr) {
- const DWARFDebugLine::Sequence &CurSeq = *SeqPos;
- // For the first sequence, we need to find which row in the sequence is the
- // first in our range.
- uint32_t FirstRowIndex = CurSeq.FirstRowIndex;
- if (SeqPos == StartPos)
- FirstRowIndex = findRowInSeq(CurSeq, Address);
-
- // Figure out the last row in the range.
- uint32_t LastRowIndex =
- findRowInSeq(CurSeq, {EndAddr - 1, Address.SectionIndex});
- if (LastRowIndex == UnknownRowIndex)
- LastRowIndex = CurSeq.LastRowIndex - 1;
-
- assert(FirstRowIndex != UnknownRowIndex);
- assert(LastRowIndex != UnknownRowIndex);
-
- for (uint32_t I = FirstRowIndex; I <= LastRowIndex; ++I) {
- Result.push_back(I);
- }
-
- ++SeqPos;
- }
-
- return true;
-}
-
-Optional<StringRef> DWARFDebugLine::LineTable::getSourceByIndex(uint64_t FileIndex,
- FileLineInfoKind Kind) const {
- if (Kind == FileLineInfoKind::None || !Prologue.hasFileAtIndex(FileIndex))
- return None;
- const FileNameEntry &Entry = Prologue.getFileNameEntry(FileIndex);
- if (Optional<const char *> source = Entry.Source.getAsCString())
- return StringRef(*source);
- return None;
-}
-
-static bool isPathAbsoluteOnWindowsOrPosix(const Twine &Path) {
- // Debug info can contain paths from any OS, not necessarily
- // an OS we're currently running on. Moreover
diff erent compilation units can
- // be compiled on
diff erent operating systems and linked together later.
- return sys::path::is_absolute(Path, sys::path::Style::posix) ||
- sys::path::is_absolute(Path, sys::path::Style::windows);
-}
-
-bool DWARFDebugLine::Prologue::getFileNameByIndex(
- uint64_t FileIndex, StringRef CompDir, FileLineInfoKind Kind,
- std::string &Result, sys::path::Style Style) const {
- if (Kind == FileLineInfoKind::None || !hasFileAtIndex(FileIndex))
- return false;
- const FileNameEntry &Entry = getFileNameEntry(FileIndex);
- Optional<const char *> Name = Entry.Name.getAsCString();
- if (!Name)
- return false;
- StringRef FileName = *Name;
- if (Kind != FileLineInfoKind::AbsoluteFilePath ||
- isPathAbsoluteOnWindowsOrPosix(FileName)) {
- Result = FileName;
- return true;
- }
-
- SmallString<16> FilePath;
- StringRef IncludeDir;
- // Be defensive about the contents of Entry.
- if (getVersion() >= 5) {
- if (Entry.DirIdx < IncludeDirectories.size())
- IncludeDir = IncludeDirectories[Entry.DirIdx].getAsCString().getValue();
- } else {
- if (0 < Entry.DirIdx && Entry.DirIdx <= IncludeDirectories.size())
- IncludeDir =
- IncludeDirectories[Entry.DirIdx - 1].getAsCString().getValue();
-
- // We may still need to append compilation directory of compile unit.
- // We know that FileName is not absolute, the only way to have an
- // absolute path at this point would be if IncludeDir is absolute.
- if (!CompDir.empty() && !isPathAbsoluteOnWindowsOrPosix(IncludeDir))
- sys::path::append(FilePath, Style, CompDir);
- }
-
- // sys::path::append skips empty strings.
- sys::path::append(FilePath, Style, IncludeDir, FileName);
- Result = FilePath.str();
- return true;
-}
-
-bool DWARFDebugLine::LineTable::getFileLineInfoForAddress(
- object::SectionedAddress Address, const char *CompDir,
- FileLineInfoKind Kind, DILineInfo &Result) const {
- // Get the index of row we're looking for in the line table.
- uint32_t RowIndex = lookupAddress(Address);
- if (RowIndex == -1U)
- return false;
- // Take file number and line/column from the row.
- const auto &Row = Rows[RowIndex];
- if (!getFileNameByIndex(Row.File, CompDir, Kind, Result.FileName))
- return false;
- Result.Line = Row.Line;
- Result.Column = Row.Column;
- Result.Discriminator = Row.Discriminator;
- Result.Source = getSourceByIndex(Row.File, Kind);
- return true;
-}
-
-// We want to supply the Unit associated with a .debug_line[.dwo] table when
-// we dump it, if possible, but still dump the table even if there isn't a Unit.
-// Therefore, collect up handles on all the Units that point into the
-// line-table section.
-static DWARFDebugLine::SectionParser::LineToUnitMap
-buildLineToUnitMap(DWARFDebugLine::SectionParser::cu_range CUs,
- DWARFDebugLine::SectionParser::tu_range TUs) {
- DWARFDebugLine::SectionParser::LineToUnitMap LineToUnit;
- for (const auto &CU : CUs)
- if (auto CUDIE = CU->getUnitDIE())
- if (auto StmtOffset = toSectionOffset(CUDIE.find(DW_AT_stmt_list)))
- LineToUnit.insert(std::make_pair(*StmtOffset, &*CU));
- for (const auto &TU : TUs)
- if (auto TUDIE = TU->getUnitDIE())
- if (auto StmtOffset = toSectionOffset(TUDIE.find(DW_AT_stmt_list)))
- LineToUnit.insert(std::make_pair(*StmtOffset, &*TU));
- return LineToUnit;
-}
-
-DWARFDebugLine::SectionParser::SectionParser(DWARFDataExtractor &Data,
- const DWARFContext &C,
- cu_range CUs, tu_range TUs)
- : DebugLineData(Data), Context(C) {
- LineToUnit = buildLineToUnitMap(CUs, TUs);
- if (!DebugLineData.isValidOffset(Offset))
- Done = true;
-}
-
-bool DWARFDebugLine::Prologue::totalLengthIsValid() const {
- return TotalLength == dwarf::DW_LENGTH_DWARF64 ||
- TotalLength < dwarf::DW_LENGTH_lo_reserved;
-}
-
-DWARFDebugLine::LineTable DWARFDebugLine::SectionParser::parseNext(
- function_ref<void(Error)> RecoverableErrorCallback,
- function_ref<void(Error)> UnrecoverableErrorCallback, raw_ostream *OS) {
- assert(DebugLineData.isValidOffset(Offset) &&
- "parsing should have terminated");
- DWARFUnit *U = prepareToParse(Offset);
- uint64_t OldOffset = Offset;
- LineTable LT;
- if (Error Err = LT.parse(DebugLineData, &Offset, Context, U,
- RecoverableErrorCallback, OS))
- UnrecoverableErrorCallback(std::move(Err));
- moveToNextTable(OldOffset, LT.Prologue);
- return LT;
-}
-
-void DWARFDebugLine::SectionParser::skip(
- function_ref<void(Error)> ErrorCallback) {
- assert(DebugLineData.isValidOffset(Offset) &&
- "parsing should have terminated");
- DWARFUnit *U = prepareToParse(Offset);
- uint64_t OldOffset = Offset;
- LineTable LT;
- if (Error Err = LT.Prologue.parse(DebugLineData, &Offset, Context, U))
- ErrorCallback(std::move(Err));
- moveToNextTable(OldOffset, LT.Prologue);
-}
-
-DWARFUnit *DWARFDebugLine::SectionParser::prepareToParse(uint64_t Offset) {
- DWARFUnit *U = nullptr;
- auto It = LineToUnit.find(Offset);
- if (It != LineToUnit.end())
- U = It->second;
- DebugLineData.setAddressSize(U ? U->getAddressByteSize() : 0);
- return U;
-}
-
-void DWARFDebugLine::SectionParser::moveToNextTable(uint64_t OldOffset,
- const Prologue &P) {
- // If the length field is not valid, we don't know where the next table is, so
- // cannot continue to parse. Mark the parser as done, and leave the Offset
- // value as it currently is. This will be the end of the bad length field.
- if (!P.totalLengthIsValid()) {
- Done = true;
- return;
- }
-
- Offset = OldOffset + P.TotalLength + P.sizeofTotalLength();
- if (!DebugLineData.isValidOffset(Offset)) {
- Done = true;
- }
-}
+//===- DWARFDebugLine.cpp -------------------------------------------------===//
+//
+// 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/DWARFDebugLine.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/BinaryFormat/Dwarf.h"
+#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
+#include "llvm/DebugInfo/DWARF/DWARFRelocMap.h"
+#include "llvm/Support/Errc.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/WithColor.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <cassert>
+#include <cinttypes>
+#include <cstdint>
+#include <cstdio>
+#include <utility>
+
+using namespace llvm;
+using namespace dwarf;
+
+using FileLineInfoKind = DILineInfoSpecifier::FileLineInfoKind;
+
+namespace {
+
+struct ContentDescriptor {
+ dwarf::LineNumberEntryFormat Type;
+ dwarf::Form Form;
+};
+
+using ContentDescriptors = SmallVector<ContentDescriptor, 4>;
+
+} // end anonymous namespace
+
+void DWARFDebugLine::ContentTypeTracker::trackContentType(
+ dwarf::LineNumberEntryFormat ContentType) {
+ switch (ContentType) {
+ case dwarf::DW_LNCT_timestamp:
+ HasModTime = true;
+ break;
+ case dwarf::DW_LNCT_size:
+ HasLength = true;
+ break;
+ case dwarf::DW_LNCT_MD5:
+ HasMD5 = true;
+ break;
+ case dwarf::DW_LNCT_LLVM_source:
+ HasSource = true;
+ break;
+ default:
+ // We only care about values we consider optional, and new values may be
+ // added in the vendor extension range, so we do not match exhaustively.
+ break;
+ }
+}
+
+DWARFDebugLine::Prologue::Prologue() { clear(); }
+
+bool DWARFDebugLine::Prologue::hasFileAtIndex(uint64_t FileIndex) const {
+ uint16_t DwarfVersion = getVersion();
+ assert(DwarfVersion != 0 &&
+ "line table prologue has no dwarf version information");
+ if (DwarfVersion >= 5)
+ return FileIndex < FileNames.size();
+ return FileIndex != 0 && FileIndex <= FileNames.size();
+}
+
+const llvm::DWARFDebugLine::FileNameEntry &
+DWARFDebugLine::Prologue::getFileNameEntry(uint64_t Index) const {
+ uint16_t DwarfVersion = getVersion();
+ assert(DwarfVersion != 0 &&
+ "line table prologue has no dwarf version information");
+ // In DWARF v5 the file names are 0-indexed.
+ if (DwarfVersion >= 5)
+ return FileNames[Index];
+ return FileNames[Index - 1];
+}
+
+void DWARFDebugLine::Prologue::clear() {
+ TotalLength = PrologueLength = 0;
+ SegSelectorSize = 0;
+ MinInstLength = MaxOpsPerInst = DefaultIsStmt = LineBase = LineRange = 0;
+ OpcodeBase = 0;
+ FormParams = dwarf::FormParams({0, 0, DWARF32});
+ ContentTypes = ContentTypeTracker();
+ StandardOpcodeLengths.clear();
+ IncludeDirectories.clear();
+ FileNames.clear();
+}
+
+void DWARFDebugLine::Prologue::dump(raw_ostream &OS,
+ DIDumpOptions DumpOptions) const {
+ OS << "Line table prologue:\n"
+ << format(" total_length: 0x%8.8" PRIx64 "\n", TotalLength)
+ << format(" version: %u\n", getVersion());
+ if (getVersion() >= 5)
+ OS << format(" address_size: %u\n", getAddressSize())
+ << format(" seg_select_size: %u\n", SegSelectorSize);
+ OS << format(" prologue_length: 0x%8.8" PRIx64 "\n", PrologueLength)
+ << format(" min_inst_length: %u\n", MinInstLength)
+ << format(getVersion() >= 4 ? "max_ops_per_inst: %u\n" : "", MaxOpsPerInst)
+ << format(" default_is_stmt: %u\n", DefaultIsStmt)
+ << format(" line_base: %i\n", LineBase)
+ << format(" line_range: %u\n", LineRange)
+ << format(" opcode_base: %u\n", OpcodeBase);
+
+ for (uint32_t I = 0; I != StandardOpcodeLengths.size(); ++I)
+ OS << format("standard_opcode_lengths[%s] = %u\n",
+ LNStandardString(I + 1).data(), StandardOpcodeLengths[I]);
+
+ if (!IncludeDirectories.empty()) {
+ // DWARF v5 starts directory indexes at 0.
+ uint32_t DirBase = getVersion() >= 5 ? 0 : 1;
+ for (uint32_t I = 0; I != IncludeDirectories.size(); ++I) {
+ OS << format("include_directories[%3u] = ", I + DirBase);
+ IncludeDirectories[I].dump(OS, DumpOptions);
+ OS << '\n';
+ }
+ }
+
+ if (!FileNames.empty()) {
+ // DWARF v5 starts file indexes at 0.
+ uint32_t FileBase = getVersion() >= 5 ? 0 : 1;
+ for (uint32_t I = 0; I != FileNames.size(); ++I) {
+ const FileNameEntry &FileEntry = FileNames[I];
+ OS << format("file_names[%3u]:\n", I + FileBase);
+ OS << " name: ";
+ FileEntry.Name.dump(OS, DumpOptions);
+ OS << '\n'
+ << format(" dir_index: %" PRIu64 "\n", FileEntry.DirIdx);
+ if (ContentTypes.HasMD5)
+ OS << " md5_checksum: " << FileEntry.Checksum.digest() << '\n';
+ if (ContentTypes.HasModTime)
+ OS << format(" mod_time: 0x%8.8" PRIx64 "\n", FileEntry.ModTime);
+ if (ContentTypes.HasLength)
+ OS << format(" length: 0x%8.8" PRIx64 "\n", FileEntry.Length);
+ if (ContentTypes.HasSource) {
+ OS << " source: ";
+ FileEntry.Source.dump(OS, DumpOptions);
+ OS << '\n';
+ }
+ }
+ }
+}
+
+// Parse v2-v4 directory and file tables.
+static void
+parseV2DirFileTables(const DWARFDataExtractor &DebugLineData,
+ uint64_t *OffsetPtr, uint64_t EndPrologueOffset,
+ DWARFDebugLine::ContentTypeTracker &ContentTypes,
+ std::vector<DWARFFormValue> &IncludeDirectories,
+ std::vector<DWARFDebugLine::FileNameEntry> &FileNames) {
+ while (*OffsetPtr < EndPrologueOffset) {
+ StringRef S = DebugLineData.getCStrRef(OffsetPtr);
+ if (S.empty())
+ break;
+ DWARFFormValue Dir =
+ DWARFFormValue::createFromPValue(dwarf::DW_FORM_string, S.data());
+ IncludeDirectories.push_back(Dir);
+ }
+
+ while (*OffsetPtr < EndPrologueOffset) {
+ StringRef Name = DebugLineData.getCStrRef(OffsetPtr);
+ if (Name.empty())
+ break;
+ DWARFDebugLine::FileNameEntry FileEntry;
+ FileEntry.Name =
+ DWARFFormValue::createFromPValue(dwarf::DW_FORM_string, Name.data());
+ FileEntry.DirIdx = DebugLineData.getULEB128(OffsetPtr);
+ FileEntry.ModTime = DebugLineData.getULEB128(OffsetPtr);
+ FileEntry.Length = DebugLineData.getULEB128(OffsetPtr);
+ FileNames.push_back(FileEntry);
+ }
+
+ ContentTypes.HasModTime = true;
+ ContentTypes.HasLength = true;
+}
+
+// Parse v5 directory/file entry content descriptions.
+// Returns the descriptors, or an error if we did not find a path or ran off
+// the end of the prologue.
+static llvm::Expected<ContentDescriptors>
+parseV5EntryFormat(const DWARFDataExtractor &DebugLineData, uint64_t *OffsetPtr,
+ DWARFDebugLine::ContentTypeTracker *ContentTypes) {
+ ContentDescriptors Descriptors;
+ int FormatCount = DebugLineData.getU8(OffsetPtr);
+ bool HasPath = false;
+ for (int I = 0; I != FormatCount; ++I) {
+ ContentDescriptor Descriptor;
+ Descriptor.Type =
+ dwarf::LineNumberEntryFormat(DebugLineData.getULEB128(OffsetPtr));
+ Descriptor.Form = dwarf::Form(DebugLineData.getULEB128(OffsetPtr));
+ if (Descriptor.Type == dwarf::DW_LNCT_path)
+ HasPath = true;
+ if (ContentTypes)
+ ContentTypes->trackContentType(Descriptor.Type);
+ Descriptors.push_back(Descriptor);
+ }
+
+ if (!HasPath)
+ return createStringError(errc::invalid_argument,
+ "failed to parse entry content descriptions"
+ " because no path was found");
+ return Descriptors;
+}
+
+static Error
+parseV5DirFileTables(const DWARFDataExtractor &DebugLineData,
+ uint64_t *OffsetPtr, const dwarf::FormParams &FormParams,
+ const DWARFContext &Ctx, const DWARFUnit *U,
+ DWARFDebugLine::ContentTypeTracker &ContentTypes,
+ std::vector<DWARFFormValue> &IncludeDirectories,
+ std::vector<DWARFDebugLine::FileNameEntry> &FileNames) {
+ // Get the directory entry description.
+ llvm::Expected<ContentDescriptors> DirDescriptors =
+ parseV5EntryFormat(DebugLineData, OffsetPtr, nullptr);
+ if (!DirDescriptors)
+ return DirDescriptors.takeError();
+
+ // Get the directory entries, according to the format described above.
+ int DirEntryCount = DebugLineData.getU8(OffsetPtr);
+ for (int I = 0; I != DirEntryCount; ++I) {
+ for (auto Descriptor : *DirDescriptors) {
+ DWARFFormValue Value(Descriptor.Form);
+ switch (Descriptor.Type) {
+ case DW_LNCT_path:
+ if (!Value.extractValue(DebugLineData, OffsetPtr, FormParams, &Ctx, U))
+ return createStringError(errc::invalid_argument,
+ "failed to parse directory entry because "
+ "extracting the form value failed.");
+ IncludeDirectories.push_back(Value);
+ break;
+ default:
+ if (!Value.skipValue(DebugLineData, OffsetPtr, FormParams))
+ return createStringError(errc::invalid_argument,
+ "failed to parse directory entry because "
+ "skipping the form value failed.");
+ }
+ }
+ }
+
+ // Get the file entry description.
+ llvm::Expected<ContentDescriptors> FileDescriptors =
+ parseV5EntryFormat(DebugLineData, OffsetPtr, &ContentTypes);
+ if (!FileDescriptors)
+ return FileDescriptors.takeError();
+
+ // Get the file entries, according to the format described above.
+ int FileEntryCount = DebugLineData.getU8(OffsetPtr);
+ for (int I = 0; I != FileEntryCount; ++I) {
+ DWARFDebugLine::FileNameEntry FileEntry;
+ for (auto Descriptor : *FileDescriptors) {
+ DWARFFormValue Value(Descriptor.Form);
+ if (!Value.extractValue(DebugLineData, OffsetPtr, FormParams, &Ctx, U))
+ return createStringError(errc::invalid_argument,
+ "failed to parse file entry because "
+ "extracting the form value failed.");
+ switch (Descriptor.Type) {
+ case DW_LNCT_path:
+ FileEntry.Name = Value;
+ break;
+ case DW_LNCT_LLVM_source:
+ FileEntry.Source = Value;
+ break;
+ case DW_LNCT_directory_index:
+ FileEntry.DirIdx = Value.getAsUnsignedConstant().getValue();
+ break;
+ case DW_LNCT_timestamp:
+ FileEntry.ModTime = Value.getAsUnsignedConstant().getValue();
+ break;
+ case DW_LNCT_size:
+ FileEntry.Length = Value.getAsUnsignedConstant().getValue();
+ break;
+ case DW_LNCT_MD5:
+ if (!Value.getAsBlock() || Value.getAsBlock().getValue().size() != 16)
+ return createStringError(
+ errc::invalid_argument,
+ "failed to parse file entry because the MD5 hash is invalid");
+ std::uninitialized_copy_n(Value.getAsBlock().getValue().begin(), 16,
+ FileEntry.Checksum.Bytes.begin());
+ break;
+ default:
+ break;
+ }
+ }
+ FileNames.push_back(FileEntry);
+ }
+ return Error::success();
+}
+
+Error DWARFDebugLine::Prologue::parse(const DWARFDataExtractor &DebugLineData,
+ uint64_t *OffsetPtr,
+ const DWARFContext &Ctx,
+ const DWARFUnit *U) {
+ const uint64_t PrologueOffset = *OffsetPtr;
+
+ clear();
+ TotalLength = DebugLineData.getRelocatedValue(4, OffsetPtr);
+ if (TotalLength == dwarf::DW_LENGTH_DWARF64) {
+ FormParams.Format = dwarf::DWARF64;
+ TotalLength = DebugLineData.getU64(OffsetPtr);
+ } else if (TotalLength >= dwarf::DW_LENGTH_lo_reserved) {
+ return createStringError(errc::invalid_argument,
+ "parsing line table prologue at offset 0x%8.8" PRIx64
+ " unsupported reserved unit length found of value 0x%8.8" PRIx64,
+ PrologueOffset, TotalLength);
+ }
+ FormParams.Version = DebugLineData.getU16(OffsetPtr);
+ if (getVersion() < 2)
+ return createStringError(errc::not_supported,
+ "parsing line table prologue at offset 0x%8.8" PRIx64
+ " found unsupported version 0x%2.2" PRIx16,
+ PrologueOffset, getVersion());
+
+ if (getVersion() >= 5) {
+ FormParams.AddrSize = DebugLineData.getU8(OffsetPtr);
+ assert((DebugLineData.getAddressSize() == 0 ||
+ DebugLineData.getAddressSize() == getAddressSize()) &&
+ "Line table header and data extractor disagree");
+ SegSelectorSize = DebugLineData.getU8(OffsetPtr);
+ }
+
+ PrologueLength =
+ DebugLineData.getRelocatedValue(sizeofPrologueLength(), OffsetPtr);
+ const uint64_t EndPrologueOffset = PrologueLength + *OffsetPtr;
+ MinInstLength = DebugLineData.getU8(OffsetPtr);
+ if (getVersion() >= 4)
+ MaxOpsPerInst = DebugLineData.getU8(OffsetPtr);
+ DefaultIsStmt = DebugLineData.getU8(OffsetPtr);
+ LineBase = DebugLineData.getU8(OffsetPtr);
+ LineRange = DebugLineData.getU8(OffsetPtr);
+ OpcodeBase = DebugLineData.getU8(OffsetPtr);
+
+ StandardOpcodeLengths.reserve(OpcodeBase - 1);
+ for (uint32_t I = 1; I < OpcodeBase; ++I) {
+ uint8_t OpLen = DebugLineData.getU8(OffsetPtr);
+ StandardOpcodeLengths.push_back(OpLen);
+ }
+
+ if (getVersion() >= 5) {
+ if (Error E =
+ parseV5DirFileTables(DebugLineData, OffsetPtr, FormParams, Ctx, U,
+ ContentTypes, IncludeDirectories, FileNames)) {
+ return joinErrors(
+ createStringError(
+ errc::invalid_argument,
+ "parsing line table prologue at 0x%8.8" PRIx64
+ " found an invalid directory or file table description at"
+ " 0x%8.8" PRIx64,
+ PrologueOffset, *OffsetPtr),
+ std::move(E));
+ }
+ } else
+ parseV2DirFileTables(DebugLineData, OffsetPtr, EndPrologueOffset,
+ ContentTypes, IncludeDirectories, FileNames);
+
+ if (*OffsetPtr != EndPrologueOffset)
+ return createStringError(errc::invalid_argument,
+ "parsing line table prologue at 0x%8.8" PRIx64
+ " should have ended at 0x%8.8" PRIx64
+ " but it ended at 0x%8.8" PRIx64,
+ PrologueOffset, EndPrologueOffset, *OffsetPtr);
+ return Error::success();
+}
+
+DWARFDebugLine::Row::Row(bool DefaultIsStmt) { reset(DefaultIsStmt); }
+
+void DWARFDebugLine::Row::postAppend() {
+ Discriminator = 0;
+ BasicBlock = false;
+ PrologueEnd = false;
+ EpilogueBegin = false;
+}
+
+void DWARFDebugLine::Row::reset(bool DefaultIsStmt) {
+ Address.Address = 0;
+ Address.SectionIndex = object::SectionedAddress::UndefSection;
+ Line = 1;
+ Column = 0;
+ File = 1;
+ Isa = 0;
+ Discriminator = 0;
+ IsStmt = DefaultIsStmt;
+ BasicBlock = false;
+ EndSequence = false;
+ PrologueEnd = false;
+ EpilogueBegin = false;
+}
+
+void DWARFDebugLine::Row::dumpTableHeader(raw_ostream &OS) {
+ OS << "Address Line Column File ISA Discriminator Flags\n"
+ << "------------------ ------ ------ ------ --- ------------- "
+ "-------------\n";
+}
+
+void DWARFDebugLine::Row::dump(raw_ostream &OS) const {
+ OS << format("0x%16.16" PRIx64 " %6u %6u", Address.Address, Line, Column)
+ << format(" %6u %3u %13u ", File, Isa, Discriminator)
+ << (IsStmt ? " is_stmt" : "") << (BasicBlock ? " basic_block" : "")
+ << (PrologueEnd ? " prologue_end" : "")
+ << (EpilogueBegin ? " epilogue_begin" : "")
+ << (EndSequence ? " end_sequence" : "") << '\n';
+}
+
+DWARFDebugLine::Sequence::Sequence() { reset(); }
+
+void DWARFDebugLine::Sequence::reset() {
+ LowPC = 0;
+ HighPC = 0;
+ SectionIndex = object::SectionedAddress::UndefSection;
+ FirstRowIndex = 0;
+ LastRowIndex = 0;
+ Empty = true;
+}
+
+DWARFDebugLine::LineTable::LineTable() { clear(); }
+
+void DWARFDebugLine::LineTable::dump(raw_ostream &OS,
+ DIDumpOptions DumpOptions) const {
+ Prologue.dump(OS, DumpOptions);
+
+ if (!Rows.empty()) {
+ OS << '\n';
+ Row::dumpTableHeader(OS);
+ for (const Row &R : Rows) {
+ R.dump(OS);
+ }
+ }
+
+ // Terminate the table with a final blank line to clearly delineate it from
+ // later dumps.
+ OS << '\n';
+}
+
+void DWARFDebugLine::LineTable::clear() {
+ Prologue.clear();
+ Rows.clear();
+ Sequences.clear();
+}
+
+DWARFDebugLine::ParsingState::ParsingState(struct LineTable *LT)
+ : LineTable(LT) {
+ resetRowAndSequence();
+}
+
+void DWARFDebugLine::ParsingState::resetRowAndSequence() {
+ Row.reset(LineTable->Prologue.DefaultIsStmt);
+ Sequence.reset();
+}
+
+void DWARFDebugLine::ParsingState::appendRowToMatrix() {
+ unsigned RowNumber = LineTable->Rows.size();
+ if (Sequence.Empty) {
+ // Record the beginning of instruction sequence.
+ Sequence.Empty = false;
+ Sequence.LowPC = Row.Address.Address;
+ Sequence.FirstRowIndex = RowNumber;
+ }
+ LineTable->appendRow(Row);
+ if (Row.EndSequence) {
+ // Record the end of instruction sequence.
+ Sequence.HighPC = Row.Address.Address;
+ Sequence.LastRowIndex = RowNumber + 1;
+ Sequence.SectionIndex = Row.Address.SectionIndex;
+ if (Sequence.isValid())
+ LineTable->appendSequence(Sequence);
+ Sequence.reset();
+ }
+ Row.postAppend();
+}
+
+const DWARFDebugLine::LineTable *
+DWARFDebugLine::getLineTable(uint64_t Offset) const {
+ LineTableConstIter Pos = LineTableMap.find(Offset);
+ if (Pos != LineTableMap.end())
+ return &Pos->second;
+ return nullptr;
+}
+
+Expected<const DWARFDebugLine::LineTable *> DWARFDebugLine::getOrParseLineTable(
+ DWARFDataExtractor &DebugLineData, uint64_t Offset, const DWARFContext &Ctx,
+ const DWARFUnit *U, function_ref<void(Error)> RecoverableErrorCallback) {
+ if (!DebugLineData.isValidOffset(Offset))
+ return createStringError(errc::invalid_argument, "offset 0x%8.8" PRIx64
+ " is not a valid debug line section offset",
+ Offset);
+
+ std::pair<LineTableIter, bool> Pos =
+ LineTableMap.insert(LineTableMapTy::value_type(Offset, LineTable()));
+ LineTable *LT = &Pos.first->second;
+ if (Pos.second) {
+ if (Error Err =
+ LT->parse(DebugLineData, &Offset, Ctx, U, RecoverableErrorCallback))
+ return std::move(Err);
+ return LT;
+ }
+ return LT;
+}
+
+Error DWARFDebugLine::LineTable::parse(
+ DWARFDataExtractor &DebugLineData, uint64_t *OffsetPtr,
+ const DWARFContext &Ctx, const DWARFUnit *U,
+ function_ref<void(Error)> RecoverableErrorCallback, raw_ostream *OS) {
+ const uint64_t DebugLineOffset = *OffsetPtr;
+
+ clear();
+
+ Error PrologueErr = Prologue.parse(DebugLineData, OffsetPtr, Ctx, U);
+
+ if (OS) {
+ // The presence of OS signals verbose dumping.
+ DIDumpOptions DumpOptions;
+ DumpOptions.Verbose = true;
+ Prologue.dump(*OS, DumpOptions);
+ }
+
+ if (PrologueErr)
+ return PrologueErr;
+
+ uint64_t ProgramLength = Prologue.TotalLength + Prologue.sizeofTotalLength();
+ if (!DebugLineData.isValidOffsetForDataOfSize(DebugLineOffset,
+ ProgramLength)) {
+ assert(DebugLineData.size() > DebugLineOffset &&
+ "prologue parsing should handle invalid offset");
+ uint64_t BytesRemaining = DebugLineData.size() - DebugLineOffset;
+ RecoverableErrorCallback(
+ createStringError(errc::invalid_argument,
+ "line table program with offset 0x%8.8" PRIx64
+ " has length 0x%8.8" PRIx64 " but only 0x%8.8" PRIx64
+ " bytes are available",
+ DebugLineOffset, ProgramLength, BytesRemaining));
+ // Continue by capping the length at the number of remaining bytes.
+ ProgramLength = BytesRemaining;
+ }
+
+ const uint64_t EndOffset = DebugLineOffset + ProgramLength;
+
+ // See if we should tell the data extractor the address size.
+ if (DebugLineData.getAddressSize() == 0)
+ DebugLineData.setAddressSize(Prologue.getAddressSize());
+ else
+ assert(Prologue.getAddressSize() == 0 ||
+ Prologue.getAddressSize() == DebugLineData.getAddressSize());
+
+ ParsingState State(this);
+
+ while (*OffsetPtr < EndOffset) {
+ if (OS)
+ *OS << format("0x%08.08" PRIx64 ": ", *OffsetPtr);
+
+ uint8_t Opcode = DebugLineData.getU8(OffsetPtr);
+
+ if (OS)
+ *OS << format("%02.02" PRIx8 " ", Opcode);
+
+ if (Opcode == 0) {
+ // Extended Opcodes always start with a zero opcode followed by
+ // a uleb128 length so you can skip ones you don't know about
+ uint64_t Len = DebugLineData.getULEB128(OffsetPtr);
+ uint64_t ExtOffset = *OffsetPtr;
+
+ // Tolerate zero-length; assume length is correct and soldier on.
+ if (Len == 0) {
+ if (OS)
+ *OS << "Badly formed extended line op (length 0)\n";
+ continue;
+ }
+
+ uint8_t SubOpcode = DebugLineData.getU8(OffsetPtr);
+ if (OS)
+ *OS << LNExtendedString(SubOpcode);
+ switch (SubOpcode) {
+ case DW_LNE_end_sequence:
+ // Set the end_sequence register of the state machine to true and
+ // append a row to the matrix using the current values of the
+ // state-machine registers. Then reset the registers to the initial
+ // values specified above. Every statement program sequence must end
+ // with a DW_LNE_end_sequence instruction which creates a row whose
+ // address is that of the byte after the last target machine instruction
+ // of the sequence.
+ State.Row.EndSequence = true;
+ if (OS) {
+ *OS << "\n";
+ OS->indent(12);
+ State.Row.dump(*OS);
+ }
+ State.appendRowToMatrix();
+ State.resetRowAndSequence();
+ break;
+
+ case DW_LNE_set_address:
+ // Takes a single relocatable address as an operand. The size of the
+ // operand is the size appropriate to hold an address on the target
+ // machine. Set the address register to the value given by the
+ // relocatable address. All of the other statement program opcodes
+ // that affect the address register add a delta to it. This instruction
+ // stores a relocatable value into it instead.
+ //
+ // Make sure the extractor knows the address size. If not, infer it
+ // from the size of the operand.
+ {
+ uint8_t ExtractorAddressSize = DebugLineData.getAddressSize();
+ if (ExtractorAddressSize != Len - 1 && ExtractorAddressSize != 0)
+ RecoverableErrorCallback(createStringError(
+ errc::invalid_argument,
+ "mismatching address size at offset 0x%8.8" PRIx64
+ " expected 0x%2.2" PRIx8 " found 0x%2.2" PRIx64,
+ ExtOffset, ExtractorAddressSize, Len - 1));
+
+ // Assume that the line table is correct and temporarily override the
+ // address size.
+ DebugLineData.setAddressSize(Len - 1);
+ State.Row.Address.Address = DebugLineData.getRelocatedAddress(
+ OffsetPtr, &State.Row.Address.SectionIndex);
+
+ // Restore the address size if the extractor already had it.
+ if (ExtractorAddressSize != 0)
+ DebugLineData.setAddressSize(ExtractorAddressSize);
+
+ if (OS)
+ *OS << format(" (0x%16.16" PRIx64 ")", State.Row.Address.Address);
+ }
+ break;
+
+ case DW_LNE_define_file:
+ // Takes 4 arguments. The first is a null terminated string containing
+ // a source file name. The second is an unsigned LEB128 number
+ // representing the directory index of the directory in which the file
+ // was found. The third is an unsigned LEB128 number representing the
+ // time of last modification of the file. The fourth is an unsigned
+ // LEB128 number representing the length in bytes of the file. The time
+ // and length fields may contain LEB128(0) if the information is not
+ // available.
+ //
+ // The directory index represents an entry in the include_directories
+ // section of the statement program prologue. The index is LEB128(0)
+ // if the file was found in the current directory of the compilation,
+ // LEB128(1) if it was found in the first directory in the
+ // include_directories section, and so on. The directory index is
+ // ignored for file names that represent full path names.
+ //
+ // The files are numbered, starting at 1, in the order in which they
+ // appear; the names in the prologue come before names defined by
+ // the DW_LNE_define_file instruction. These numbers are used in the
+ // the file register of the state machine.
+ {
+ FileNameEntry FileEntry;
+ const char *Name = DebugLineData.getCStr(OffsetPtr);
+ FileEntry.Name =
+ DWARFFormValue::createFromPValue(dwarf::DW_FORM_string, Name);
+ FileEntry.DirIdx = DebugLineData.getULEB128(OffsetPtr);
+ FileEntry.ModTime = DebugLineData.getULEB128(OffsetPtr);
+ FileEntry.Length = DebugLineData.getULEB128(OffsetPtr);
+ Prologue.FileNames.push_back(FileEntry);
+ if (OS)
+ *OS << " (" << Name << ", dir=" << FileEntry.DirIdx << ", mod_time="
+ << format("(0x%16.16" PRIx64 ")", FileEntry.ModTime)
+ << ", length=" << FileEntry.Length << ")";
+ }
+ break;
+
+ case DW_LNE_set_discriminator:
+ State.Row.Discriminator = DebugLineData.getULEB128(OffsetPtr);
+ if (OS)
+ *OS << " (" << State.Row.Discriminator << ")";
+ break;
+
+ default:
+ if (OS)
+ *OS << format("Unrecognized extended op 0x%02.02" PRIx8, SubOpcode)
+ << format(" length %" PRIx64, Len);
+ // Len doesn't include the zero opcode byte or the length itself, but
+ // it does include the sub_opcode, so we have to adjust for that.
+ (*OffsetPtr) += Len - 1;
+ break;
+ }
+ // Make sure the stated and parsed lengths are the same.
+ // Otherwise we have an unparseable line-number program.
+ if (*OffsetPtr - ExtOffset != Len)
+ return createStringError(errc::illegal_byte_sequence,
+ "unexpected line op length at offset 0x%8.8" PRIx64
+ " expected 0x%2.2" PRIx64 " found 0x%2.2" PRIx64,
+ ExtOffset, Len, *OffsetPtr - ExtOffset);
+ } else if (Opcode < Prologue.OpcodeBase) {
+ if (OS)
+ *OS << LNStandardString(Opcode);
+ switch (Opcode) {
+ // Standard Opcodes
+ case DW_LNS_copy:
+ // Takes no arguments. Append a row to the matrix using the
+ // current values of the state-machine registers.
+ if (OS) {
+ *OS << "\n";
+ OS->indent(12);
+ State.Row.dump(*OS);
+ *OS << "\n";
+ }
+ State.appendRowToMatrix();
+ break;
+
+ case DW_LNS_advance_pc:
+ // Takes a single unsigned LEB128 operand, multiplies it by the
+ // min_inst_length field of the prologue, and adds the
+ // result to the address register of the state machine.
+ {
+ uint64_t AddrOffset =
+ DebugLineData.getULEB128(OffsetPtr) * Prologue.MinInstLength;
+ State.Row.Address.Address += AddrOffset;
+ if (OS)
+ *OS << " (" << AddrOffset << ")";
+ }
+ break;
+
+ case DW_LNS_advance_line:
+ // Takes a single signed LEB128 operand and adds that value to
+ // the line register of the state machine.
+ State.Row.Line += DebugLineData.getSLEB128(OffsetPtr);
+ if (OS)
+ *OS << " (" << State.Row.Line << ")";
+ break;
+
+ case DW_LNS_set_file:
+ // Takes a single unsigned LEB128 operand and stores it in the file
+ // register of the state machine.
+ State.Row.File = DebugLineData.getULEB128(OffsetPtr);
+ if (OS)
+ *OS << " (" << State.Row.File << ")";
+ break;
+
+ case DW_LNS_set_column:
+ // Takes a single unsigned LEB128 operand and stores it in the
+ // column register of the state machine.
+ State.Row.Column = DebugLineData.getULEB128(OffsetPtr);
+ if (OS)
+ *OS << " (" << State.Row.Column << ")";
+ break;
+
+ case DW_LNS_negate_stmt:
+ // Takes no arguments. Set the is_stmt register of the state
+ // machine to the logical negation of its current value.
+ State.Row.IsStmt = !State.Row.IsStmt;
+ break;
+
+ case DW_LNS_set_basic_block:
+ // Takes no arguments. Set the basic_block register of the
+ // state machine to true
+ State.Row.BasicBlock = true;
+ break;
+
+ case DW_LNS_const_add_pc:
+ // Takes no arguments. Add to the address register of the state
+ // machine the address increment value corresponding to special
+ // opcode 255. The motivation for DW_LNS_const_add_pc is this:
+ // when the statement program needs to advance the address by a
+ // small amount, it can use a single special opcode, which occupies
+ // a single byte. When it needs to advance the address by up to
+ // twice the range of the last special opcode, it can use
+ // DW_LNS_const_add_pc followed by a special opcode, for a total
+ // of two bytes. Only if it needs to advance the address by more
+ // than twice that range will it need to use both DW_LNS_advance_pc
+ // and a special opcode, requiring three or more bytes.
+ {
+ uint8_t AdjustOpcode = 255 - Prologue.OpcodeBase;
+ uint64_t AddrOffset =
+ (AdjustOpcode / Prologue.LineRange) * Prologue.MinInstLength;
+ State.Row.Address.Address += AddrOffset;
+ if (OS)
+ *OS
+ << format(" (0x%16.16" PRIx64 ")", AddrOffset);
+ }
+ break;
+
+ case DW_LNS_fixed_advance_pc:
+ // Takes a single uhalf operand. Add to the address register of
+ // the state machine the value of the (unencoded) operand. This
+ // is the only extended opcode that takes an argument that is not
+ // a variable length number. The motivation for DW_LNS_fixed_advance_pc
+ // is this: existing assemblers cannot emit DW_LNS_advance_pc or
+ // special opcodes because they cannot encode LEB128 numbers or
+ // judge when the computation of a special opcode overflows and
+ // requires the use of DW_LNS_advance_pc. Such assemblers, however,
+ // can use DW_LNS_fixed_advance_pc instead, sacrificing compression.
+ {
+ uint16_t PCOffset = DebugLineData.getRelocatedValue(2, OffsetPtr);
+ State.Row.Address.Address += PCOffset;
+ if (OS)
+ *OS
+ << format(" (0x%4.4" PRIx16 ")", PCOffset);
+ }
+ break;
+
+ case DW_LNS_set_prologue_end:
+ // Takes no arguments. Set the prologue_end register of the
+ // state machine to true
+ State.Row.PrologueEnd = true;
+ break;
+
+ case DW_LNS_set_epilogue_begin:
+ // Takes no arguments. Set the basic_block register of the
+ // state machine to true
+ State.Row.EpilogueBegin = true;
+ break;
+
+ case DW_LNS_set_isa:
+ // Takes a single unsigned LEB128 operand and stores it in the
+ // column register of the state machine.
+ State.Row.Isa = DebugLineData.getULEB128(OffsetPtr);
+ if (OS)
+ *OS << " (" << (uint64_t)State.Row.Isa << ")";
+ break;
+
+ default:
+ // Handle any unknown standard opcodes here. We know the lengths
+ // of such opcodes because they are specified in the prologue
+ // as a multiple of LEB128 operands for each opcode.
+ {
+ assert(Opcode - 1U < Prologue.StandardOpcodeLengths.size());
+ uint8_t OpcodeLength = Prologue.StandardOpcodeLengths[Opcode - 1];
+ for (uint8_t I = 0; I < OpcodeLength; ++I) {
+ uint64_t Value = DebugLineData.getULEB128(OffsetPtr);
+ if (OS)
+ *OS << format("Skipping ULEB128 value: 0x%16.16" PRIx64 ")\n",
+ Value);
+ }
+ }
+ break;
+ }
+ } else {
+ // Special Opcodes
+
+ // A special opcode value is chosen based on the amount that needs
+ // to be added to the line and address registers. The maximum line
+ // increment for a special opcode is the value of the line_base
+ // field in the header, plus the value of the line_range field,
+ // minus 1 (line base + line range - 1). If the desired line
+ // increment is greater than the maximum line increment, a standard
+ // opcode must be used instead of a special opcode. The "address
+ // advance" is calculated by dividing the desired address increment
+ // by the minimum_instruction_length field from the header. The
+ // special opcode is then calculated using the following formula:
+ //
+ // opcode = (desired line increment - line_base) +
+ // (line_range * address advance) + opcode_base
+ //
+ // If the resulting opcode is greater than 255, a standard opcode
+ // must be used instead.
+ //
+ // To decode a special opcode, subtract the opcode_base from the
+ // opcode itself to give the adjusted opcode. The amount to
+ // increment the address register is the result of the adjusted
+ // opcode divided by the line_range multiplied by the
+ // minimum_instruction_length field from the header. That is:
+ //
+ // address increment = (adjusted opcode / line_range) *
+ // minimum_instruction_length
+ //
+ // The amount to increment the line register is the line_base plus
+ // the result of the adjusted opcode modulo the line_range. That is:
+ //
+ // line increment = line_base + (adjusted opcode % line_range)
+
+ uint8_t AdjustOpcode = Opcode - Prologue.OpcodeBase;
+ uint64_t AddrOffset =
+ (AdjustOpcode / Prologue.LineRange) * Prologue.MinInstLength;
+ int32_t LineOffset =
+ Prologue.LineBase + (AdjustOpcode % Prologue.LineRange);
+ State.Row.Line += LineOffset;
+ State.Row.Address.Address += AddrOffset;
+
+ if (OS) {
+ *OS << "address += " << AddrOffset << ", line += " << LineOffset
+ << "\n";
+ OS->indent(12);
+ State.Row.dump(*OS);
+ }
+
+ State.appendRowToMatrix();
+ }
+ if(OS)
+ *OS << "\n";
+ }
+
+ if (!State.Sequence.Empty)
+ RecoverableErrorCallback(createStringError(
+ errc::illegal_byte_sequence,
+ "last sequence in debug line table at offset 0x%8.8" PRIx64
+ " is not terminated",
+ DebugLineOffset));
+
+ // Sort all sequences so that address lookup will work faster.
+ if (!Sequences.empty()) {
+ llvm::sort(Sequences, Sequence::orderByHighPC);
+ // Note: actually, instruction address ranges of sequences should not
+ // overlap (in shared objects and executables). If they do, the address
+ // lookup would still work, though, but result would be ambiguous.
+ // We don't report warning in this case. For example,
+ // sometimes .so compiled from multiple object files contains a few
+ // rudimentary sequences for address ranges [0x0, 0xsomething).
+ }
+
+ return Error::success();
+}
+
+uint32_t DWARFDebugLine::LineTable::findRowInSeq(
+ const DWARFDebugLine::Sequence &Seq,
+ object::SectionedAddress Address) const {
+ if (!Seq.containsPC(Address))
+ return UnknownRowIndex;
+ assert(Seq.SectionIndex == Address.SectionIndex);
+ // In some cases, e.g. first instruction in a function, the compiler generates
+ // two entries, both with the same address. We want the last one.
+ //
+ // In general we want a non-empty range: the last row whose address is less
+ // than or equal to Address. This can be computed as upper_bound - 1.
+ DWARFDebugLine::Row Row;
+ Row.Address = Address;
+ RowIter FirstRow = Rows.begin() + Seq.FirstRowIndex;
+ RowIter LastRow = Rows.begin() + Seq.LastRowIndex;
+ assert(FirstRow->Address.Address <= Row.Address.Address &&
+ Row.Address.Address < LastRow[-1].Address.Address);
+ RowIter RowPos = std::upper_bound(FirstRow + 1, LastRow - 1, Row,
+ DWARFDebugLine::Row::orderByAddress) -
+ 1;
+ assert(Seq.SectionIndex == RowPos->Address.SectionIndex);
+ return RowPos - Rows.begin();
+}
+
+uint32_t DWARFDebugLine::LineTable::lookupAddress(
+ object::SectionedAddress Address) const {
+
+ // Search for relocatable addresses
+ uint32_t Result = lookupAddressImpl(Address);
+
+ if (Result != UnknownRowIndex ||
+ Address.SectionIndex == object::SectionedAddress::UndefSection)
+ return Result;
+
+ // Search for absolute addresses
+ Address.SectionIndex = object::SectionedAddress::UndefSection;
+ return lookupAddressImpl(Address);
+}
+
+uint32_t DWARFDebugLine::LineTable::lookupAddressImpl(
+ object::SectionedAddress Address) const {
+ // First, find an instruction sequence containing the given address.
+ DWARFDebugLine::Sequence Sequence;
+ Sequence.SectionIndex = Address.SectionIndex;
+ Sequence.HighPC = Address.Address;
+ SequenceIter It = llvm::upper_bound(Sequences, Sequence,
+ DWARFDebugLine::Sequence::orderByHighPC);
+ if (It == Sequences.end() || It->SectionIndex != Address.SectionIndex)
+ return UnknownRowIndex;
+ return findRowInSeq(*It, Address);
+}
+
+bool DWARFDebugLine::LineTable::lookupAddressRange(
+ object::SectionedAddress Address, uint64_t Size,
+ std::vector<uint32_t> &Result) const {
+
+ // Search for relocatable addresses
+ if (lookupAddressRangeImpl(Address, Size, Result))
+ return true;
+
+ if (Address.SectionIndex == object::SectionedAddress::UndefSection)
+ return false;
+
+ // Search for absolute addresses
+ Address.SectionIndex = object::SectionedAddress::UndefSection;
+ return lookupAddressRangeImpl(Address, Size, Result);
+}
+
+bool DWARFDebugLine::LineTable::lookupAddressRangeImpl(
+ object::SectionedAddress Address, uint64_t Size,
+ std::vector<uint32_t> &Result) const {
+ if (Sequences.empty())
+ return false;
+ uint64_t EndAddr = Address.Address + Size;
+ // First, find an instruction sequence containing the given address.
+ DWARFDebugLine::Sequence Sequence;
+ Sequence.SectionIndex = Address.SectionIndex;
+ Sequence.HighPC = Address.Address;
+ SequenceIter LastSeq = Sequences.end();
+ SequenceIter SeqPos = llvm::upper_bound(
+ Sequences, Sequence, DWARFDebugLine::Sequence::orderByHighPC);
+ if (SeqPos == LastSeq || !SeqPos->containsPC(Address))
+ return false;
+
+ SequenceIter StartPos = SeqPos;
+
+ // Add the rows from the first sequence to the vector, starting with the
+ // index we just calculated
+
+ while (SeqPos != LastSeq && SeqPos->LowPC < EndAddr) {
+ const DWARFDebugLine::Sequence &CurSeq = *SeqPos;
+ // For the first sequence, we need to find which row in the sequence is the
+ // first in our range.
+ uint32_t FirstRowIndex = CurSeq.FirstRowIndex;
+ if (SeqPos == StartPos)
+ FirstRowIndex = findRowInSeq(CurSeq, Address);
+
+ // Figure out the last row in the range.
+ uint32_t LastRowIndex =
+ findRowInSeq(CurSeq, {EndAddr - 1, Address.SectionIndex});
+ if (LastRowIndex == UnknownRowIndex)
+ LastRowIndex = CurSeq.LastRowIndex - 1;
+
+ assert(FirstRowIndex != UnknownRowIndex);
+ assert(LastRowIndex != UnknownRowIndex);
+
+ for (uint32_t I = FirstRowIndex; I <= LastRowIndex; ++I) {
+ Result.push_back(I);
+ }
+
+ ++SeqPos;
+ }
+
+ return true;
+}
+
+Optional<StringRef> DWARFDebugLine::LineTable::getSourceByIndex(uint64_t FileIndex,
+ FileLineInfoKind Kind) const {
+ if (Kind == FileLineInfoKind::None || !Prologue.hasFileAtIndex(FileIndex))
+ return None;
+ const FileNameEntry &Entry = Prologue.getFileNameEntry(FileIndex);
+ if (Optional<const char *> source = Entry.Source.getAsCString())
+ return StringRef(*source);
+ return None;
+}
+
+static bool isPathAbsoluteOnWindowsOrPosix(const Twine &Path) {
+ // Debug info can contain paths from any OS, not necessarily
+ // an OS we're currently running on. Moreover
diff erent compilation units can
+ // be compiled on
diff erent operating systems and linked together later.
+ return sys::path::is_absolute(Path, sys::path::Style::posix) ||
+ sys::path::is_absolute(Path, sys::path::Style::windows);
+}
+
+bool DWARFDebugLine::Prologue::getFileNameByIndex(
+ uint64_t FileIndex, StringRef CompDir, FileLineInfoKind Kind,
+ std::string &Result, sys::path::Style Style) const {
+ if (Kind == FileLineInfoKind::None || !hasFileAtIndex(FileIndex))
+ return false;
+ const FileNameEntry &Entry = getFileNameEntry(FileIndex);
+ Optional<const char *> Name = Entry.Name.getAsCString();
+ if (!Name)
+ return false;
+ StringRef FileName = *Name;
+ if (Kind != FileLineInfoKind::AbsoluteFilePath ||
+ isPathAbsoluteOnWindowsOrPosix(FileName)) {
+ Result = FileName;
+ return true;
+ }
+
+ SmallString<16> FilePath;
+ StringRef IncludeDir;
+ // Be defensive about the contents of Entry.
+ if (getVersion() >= 5) {
+ if (Entry.DirIdx < IncludeDirectories.size())
+ IncludeDir = IncludeDirectories[Entry.DirIdx].getAsCString().getValue();
+ } else {
+ if (0 < Entry.DirIdx && Entry.DirIdx <= IncludeDirectories.size())
+ IncludeDir =
+ IncludeDirectories[Entry.DirIdx - 1].getAsCString().getValue();
+
+ // We may still need to append compilation directory of compile unit.
+ // We know that FileName is not absolute, the only way to have an
+ // absolute path at this point would be if IncludeDir is absolute.
+ if (!CompDir.empty() && !isPathAbsoluteOnWindowsOrPosix(IncludeDir))
+ sys::path::append(FilePath, Style, CompDir);
+ }
+
+ // sys::path::append skips empty strings.
+ sys::path::append(FilePath, Style, IncludeDir, FileName);
+ Result = FilePath.str();
+ return true;
+}
+
+bool DWARFDebugLine::LineTable::getFileLineInfoForAddress(
+ object::SectionedAddress Address, const char *CompDir,
+ FileLineInfoKind Kind, DILineInfo &Result) const {
+ // Get the index of row we're looking for in the line table.
+ uint32_t RowIndex = lookupAddress(Address);
+ if (RowIndex == -1U)
+ return false;
+ // Take file number and line/column from the row.
+ const auto &Row = Rows[RowIndex];
+ if (!getFileNameByIndex(Row.File, CompDir, Kind, Result.FileName))
+ return false;
+ Result.Line = Row.Line;
+ Result.Column = Row.Column;
+ Result.Discriminator = Row.Discriminator;
+ Result.Source = getSourceByIndex(Row.File, Kind);
+ return true;
+}
+
+// We want to supply the Unit associated with a .debug_line[.dwo] table when
+// we dump it, if possible, but still dump the table even if there isn't a Unit.
+// Therefore, collect up handles on all the Units that point into the
+// line-table section.
+static DWARFDebugLine::SectionParser::LineToUnitMap
+buildLineToUnitMap(DWARFDebugLine::SectionParser::cu_range CUs,
+ DWARFDebugLine::SectionParser::tu_range TUs) {
+ DWARFDebugLine::SectionParser::LineToUnitMap LineToUnit;
+ for (const auto &CU : CUs)
+ if (auto CUDIE = CU->getUnitDIE())
+ if (auto StmtOffset = toSectionOffset(CUDIE.find(DW_AT_stmt_list)))
+ LineToUnit.insert(std::make_pair(*StmtOffset, &*CU));
+ for (const auto &TU : TUs)
+ if (auto TUDIE = TU->getUnitDIE())
+ if (auto StmtOffset = toSectionOffset(TUDIE.find(DW_AT_stmt_list)))
+ LineToUnit.insert(std::make_pair(*StmtOffset, &*TU));
+ return LineToUnit;
+}
+
+DWARFDebugLine::SectionParser::SectionParser(DWARFDataExtractor &Data,
+ const DWARFContext &C,
+ cu_range CUs, tu_range TUs)
+ : DebugLineData(Data), Context(C) {
+ LineToUnit = buildLineToUnitMap(CUs, TUs);
+ if (!DebugLineData.isValidOffset(Offset))
+ Done = true;
+}
+
+bool DWARFDebugLine::Prologue::totalLengthIsValid() const {
+ return TotalLength == dwarf::DW_LENGTH_DWARF64 ||
+ TotalLength < dwarf::DW_LENGTH_lo_reserved;
+}
+
+DWARFDebugLine::LineTable DWARFDebugLine::SectionParser::parseNext(
+ function_ref<void(Error)> RecoverableErrorCallback,
+ function_ref<void(Error)> UnrecoverableErrorCallback, raw_ostream *OS) {
+ assert(DebugLineData.isValidOffset(Offset) &&
+ "parsing should have terminated");
+ DWARFUnit *U = prepareToParse(Offset);
+ uint64_t OldOffset = Offset;
+ LineTable LT;
+ if (Error Err = LT.parse(DebugLineData, &Offset, Context, U,
+ RecoverableErrorCallback, OS))
+ UnrecoverableErrorCallback(std::move(Err));
+ moveToNextTable(OldOffset, LT.Prologue);
+ return LT;
+}
+
+void DWARFDebugLine::SectionParser::skip(
+ function_ref<void(Error)> ErrorCallback) {
+ assert(DebugLineData.isValidOffset(Offset) &&
+ "parsing should have terminated");
+ DWARFUnit *U = prepareToParse(Offset);
+ uint64_t OldOffset = Offset;
+ LineTable LT;
+ if (Error Err = LT.Prologue.parse(DebugLineData, &Offset, Context, U))
+ ErrorCallback(std::move(Err));
+ moveToNextTable(OldOffset, LT.Prologue);
+}
+
+DWARFUnit *DWARFDebugLine::SectionParser::prepareToParse(uint64_t Offset) {
+ DWARFUnit *U = nullptr;
+ auto It = LineToUnit.find(Offset);
+ if (It != LineToUnit.end())
+ U = It->second;
+ DebugLineData.setAddressSize(U ? U->getAddressByteSize() : 0);
+ return U;
+}
+
+void DWARFDebugLine::SectionParser::moveToNextTable(uint64_t OldOffset,
+ const Prologue &P) {
+ // If the length field is not valid, we don't know where the next table is, so
+ // cannot continue to parse. Mark the parser as done, and leave the Offset
+ // value as it currently is. This will be the end of the bad length field.
+ if (!P.totalLengthIsValid()) {
+ Done = true;
+ return;
+ }
+
+ Offset = OldOffset + P.TotalLength + P.sizeofTotalLength();
+ if (!DebugLineData.isValidOffset(Offset)) {
+ Done = true;
+ }
+}
More information about the llvm-commits
mailing list