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llvm-mirror/tools/obj2yaml/dwarf2yaml.cpp
Xing GUO 120aef86f5 [DWARFYAML][debug_gnu_*] Add the missing context IsGNUStyle. NFC. 
This patch helps add the missing context `IsGNUStyle`. Before this patch, yaml2obj cannot parse the YAML description of 'debug_gnu_pubnames' and 'debug_gnu_pubtypes' correctly due to the missing context.

In other words, if we have

```
DWARF:
  debug_gnu_pubtypes:
    Length:
      TotalLength: 0x1234
    Version:    2
    UnitOffset: 0x1234
    UnitSize:   0x4321
    Entries:
      - DieOffset:  0x12345678
        Name:       abc
        Descriptor: 0x00      ## Descriptor can never be mapped into Entry.Descriptor
```

yaml2obj will complain that "error: unknown key 'Descriptor'".

This patch helps resolve this problem.

Reviewed By: jhenderson

Differential Revision: https://reviews.llvm.org/D82435
2020-07-03 18:12:58 +08:00

419 lines
15 KiB
C++
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//===------ dwarf2yaml.cpp - obj2yaml conversion tool -----------*- C++ -*-===//
//
// 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 "Error.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugArangeSet.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugRangeList.h"
#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
#include "llvm/DebugInfo/DWARF/DWARFSection.h"
#include "llvm/ObjectYAML/DWARFYAML.h"
#include <algorithm>
using namespace llvm;
void dumpInitialLength(DataExtractor &Data, uint64_t &Offset,
DWARFYAML::InitialLength &InitialLength) {
InitialLength.TotalLength = Data.getU32(&Offset);
if (InitialLength.isDWARF64())
InitialLength.TotalLength64 = Data.getU64(&Offset);
}
void dumpDebugAbbrev(DWARFContext &DCtx, DWARFYAML::Data &Y) {
auto AbbrevSetPtr = DCtx.getDebugAbbrev();
if (AbbrevSetPtr) {
for (auto AbbrvDeclSet : *AbbrevSetPtr) {
for (auto AbbrvDecl : AbbrvDeclSet.second) {
DWARFYAML::Abbrev Abbrv;
Abbrv.Code = AbbrvDecl.getCode();
Abbrv.Tag = AbbrvDecl.getTag();
Abbrv.Children = AbbrvDecl.hasChildren() ? dwarf::DW_CHILDREN_yes
: dwarf::DW_CHILDREN_no;
for (auto Attribute : AbbrvDecl.attributes()) {
DWARFYAML::AttributeAbbrev AttAbrv;
AttAbrv.Attribute = Attribute.Attr;
AttAbrv.Form = Attribute.Form;
if (AttAbrv.Form == dwarf::DW_FORM_implicit_const)
AttAbrv.Value = Attribute.getImplicitConstValue();
Abbrv.Attributes.push_back(AttAbrv);
}
Y.AbbrevDecls.push_back(Abbrv);
}
}
}
}
void dumpDebugStrings(DWARFContext &DCtx, DWARFYAML::Data &Y) {
StringRef RemainingTable = DCtx.getDWARFObj().getStrSection();
while (RemainingTable.size() > 0) {
auto SymbolPair = RemainingTable.split('\0');
RemainingTable = SymbolPair.second;
Y.DebugStrings.push_back(SymbolPair.first);
}
}
Error dumpDebugARanges(DWARFContext &DCtx, DWARFYAML::Data &Y) {
DWARFDataExtractor ArangesData(DCtx.getDWARFObj().getArangesSection(),
DCtx.isLittleEndian(), 0);
uint64_t Offset = 0;
DWARFDebugArangeSet Set;
while (ArangesData.isValidOffset(Offset)) {
if (Error E = Set.extract(ArangesData, &Offset))
return E;
DWARFYAML::ARange Range;
Range.Format = Set.getHeader().Format;
Range.Length = Set.getHeader().Length;
Range.Version = Set.getHeader().Version;
Range.CuOffset = Set.getHeader().CuOffset;
Range.AddrSize = Set.getHeader().AddrSize;
Range.SegSize = Set.getHeader().SegSize;
for (auto Descriptor : Set.descriptors()) {
DWARFYAML::ARangeDescriptor Desc;
Desc.Address = Descriptor.Address;
Desc.Length = Descriptor.Length;
Range.Descriptors.push_back(Desc);
}
Y.ARanges.push_back(Range);
}
return ErrorSuccess();
}
Error dumpDebugRanges(DWARFContext &DCtx, DWARFYAML::Data &Y) {
// We are assuming all address byte sizes will be consistent across all
// compile units.
uint8_t AddrSize = 0;
for (const auto &CU : DCtx.compile_units()) {
const uint8_t CUAddrSize = CU->getAddressByteSize();
if (AddrSize == 0)
AddrSize = CUAddrSize;
else if (CUAddrSize != AddrSize)
return createStringError(std::errc::invalid_argument,
"address sizes vary in different compile units");
}
DWARFDataExtractor Data(DCtx.getDWARFObj().getRangesSection().Data,
DCtx.isLittleEndian(), AddrSize);
uint64_t Offset = 0;
DWARFDebugRangeList DwarfRanges;
while (Data.isValidOffset(Offset)) {
DWARFYAML::Ranges YamlRanges;
YamlRanges.Offset = Offset;
YamlRanges.AddrSize = AddrSize;
if (Error E = DwarfRanges.extract(Data, &Offset))
return E;
for (const auto &RLE : DwarfRanges.getEntries())
YamlRanges.Entries.push_back({RLE.StartAddress, RLE.EndAddress});
Y.DebugRanges.push_back(std::move(YamlRanges));
}
return ErrorSuccess();
}
static DWARFYAML::PubSection dumpPubSection(const DWARFContext &DCtx,
const DWARFSection &Section,
bool IsGNUStyle) {
DWARFDataExtractor PubSectionData(DCtx.getDWARFObj(), Section,
DCtx.isLittleEndian(), 0);
DWARFYAML::PubSection Y;
uint64_t Offset = 0;
dumpInitialLength(PubSectionData, Offset, Y.Length);
Y.Version = PubSectionData.getU16(&Offset);
Y.UnitOffset = PubSectionData.getU32(&Offset);
Y.UnitSize = PubSectionData.getU32(&Offset);
while (Offset < Y.Length.getLength()) {
DWARFYAML::PubEntry NewEntry;
NewEntry.DieOffset = PubSectionData.getU32(&Offset);
if (IsGNUStyle)
NewEntry.Descriptor = PubSectionData.getU8(&Offset);
NewEntry.Name = PubSectionData.getCStr(&Offset);
Y.Entries.push_back(NewEntry);
}
return Y;
}
void dumpDebugPubSections(DWARFContext &DCtx, DWARFYAML::Data &Y) {
const DWARFObject &D = DCtx.getDWARFObj();
const DWARFSection PubNames = D.getPubnamesSection();
if (!PubNames.Data.empty())
Y.PubNames = dumpPubSection(DCtx, PubNames, /*IsGNUStyle=*/false);
const DWARFSection PubTypes = D.getPubtypesSection();
if (!PubTypes.Data.empty())
Y.PubTypes = dumpPubSection(DCtx, PubTypes, /*IsGNUStyle=*/false);
const DWARFSection GNUPubNames = D.getGnuPubnamesSection();
if (!GNUPubNames.Data.empty())
// TODO: Test dumping .debug_gnu_pubnames section.
Y.GNUPubNames = dumpPubSection(DCtx, GNUPubNames, /*IsGNUStyle=*/true);
const DWARFSection GNUPubTypes = D.getGnuPubtypesSection();
if (!GNUPubTypes.Data.empty())
// TODO: Test dumping .debug_gnu_pubtypes section.
Y.GNUPubTypes = dumpPubSection(DCtx, GNUPubTypes, /*IsGNUStyle=*/true);
}
void dumpDebugInfo(DWARFContext &DCtx, DWARFYAML::Data &Y) {
for (const auto &CU : DCtx.compile_units()) {
DWARFYAML::Unit NewUnit;
NewUnit.Format = CU->getFormat();
NewUnit.Length = CU->getLength();
NewUnit.Version = CU->getVersion();
if(NewUnit.Version >= 5)
NewUnit.Type = (dwarf::UnitType)CU->getUnitType();
NewUnit.AbbrOffset = CU->getAbbreviations()->getOffset();
NewUnit.AddrSize = CU->getAddressByteSize();
for (auto DIE : CU->dies()) {
DWARFYAML::Entry NewEntry;
DataExtractor EntryData = CU->getDebugInfoExtractor();
uint64_t offset = DIE.getOffset();
assert(EntryData.isValidOffset(offset) && "Invalid DIE Offset");
if (!EntryData.isValidOffset(offset))
continue;
NewEntry.AbbrCode = EntryData.getULEB128(&offset);
auto AbbrevDecl = DIE.getAbbreviationDeclarationPtr();
if (AbbrevDecl) {
for (const auto &AttrSpec : AbbrevDecl->attributes()) {
DWARFYAML::FormValue NewValue;
NewValue.Value = 0xDEADBEEFDEADBEEF;
DWARFDie DIEWrapper(CU.get(), &DIE);
auto FormValue = DIEWrapper.find(AttrSpec.Attr);
if (!FormValue)
return;
auto Form = FormValue.getValue().getForm();
bool indirect = false;
do {
indirect = false;
switch (Form) {
case dwarf::DW_FORM_addr:
case dwarf::DW_FORM_GNU_addr_index:
if (auto Val = FormValue.getValue().getAsAddress())
NewValue.Value = Val.getValue();
break;
case dwarf::DW_FORM_ref_addr:
case dwarf::DW_FORM_ref1:
case dwarf::DW_FORM_ref2:
case dwarf::DW_FORM_ref4:
case dwarf::DW_FORM_ref8:
case dwarf::DW_FORM_ref_udata:
case dwarf::DW_FORM_ref_sig8:
if (auto Val = FormValue.getValue().getAsReferenceUVal())
NewValue.Value = Val.getValue();
break;
case dwarf::DW_FORM_exprloc:
case dwarf::DW_FORM_block:
case dwarf::DW_FORM_block1:
case dwarf::DW_FORM_block2:
case dwarf::DW_FORM_block4:
if (auto Val = FormValue.getValue().getAsBlock()) {
auto BlockData = Val.getValue();
std::copy(BlockData.begin(), BlockData.end(),
std::back_inserter(NewValue.BlockData));
}
NewValue.Value = NewValue.BlockData.size();
break;
case dwarf::DW_FORM_data1:
case dwarf::DW_FORM_flag:
case dwarf::DW_FORM_data2:
case dwarf::DW_FORM_data4:
case dwarf::DW_FORM_data8:
case dwarf::DW_FORM_sdata:
case dwarf::DW_FORM_udata:
case dwarf::DW_FORM_ref_sup4:
case dwarf::DW_FORM_ref_sup8:
if (auto Val = FormValue.getValue().getAsUnsignedConstant())
NewValue.Value = Val.getValue();
break;
case dwarf::DW_FORM_string:
if (auto Val = FormValue.getValue().getAsCString())
NewValue.CStr = Val.getValue();
break;
case dwarf::DW_FORM_indirect:
indirect = true;
if (auto Val = FormValue.getValue().getAsUnsignedConstant()) {
NewValue.Value = Val.getValue();
NewEntry.Values.push_back(NewValue);
Form = static_cast<dwarf::Form>(Val.getValue());
}
break;
case dwarf::DW_FORM_strp:
case dwarf::DW_FORM_sec_offset:
case dwarf::DW_FORM_GNU_ref_alt:
case dwarf::DW_FORM_GNU_strp_alt:
case dwarf::DW_FORM_line_strp:
case dwarf::DW_FORM_strp_sup:
case dwarf::DW_FORM_GNU_str_index:
case dwarf::DW_FORM_strx:
if (auto Val = FormValue.getValue().getAsCStringOffset())
NewValue.Value = Val.getValue();
break;
case dwarf::DW_FORM_flag_present:
NewValue.Value = 1;
break;
default:
break;
}
} while (indirect);
NewEntry.Values.push_back(NewValue);
}
}
NewUnit.Entries.push_back(NewEntry);
}
Y.CompileUnits.push_back(NewUnit);
}
}
bool dumpFileEntry(DataExtractor &Data, uint64_t &Offset,
DWARFYAML::File &File) {
File.Name = Data.getCStr(&Offset);
if (File.Name.empty())
return false;
File.DirIdx = Data.getULEB128(&Offset);
File.ModTime = Data.getULEB128(&Offset);
File.Length = Data.getULEB128(&Offset);
return true;
}
void dumpDebugLines(DWARFContext &DCtx, DWARFYAML::Data &Y) {
for (const auto &CU : DCtx.compile_units()) {
auto CUDIE = CU->getUnitDIE();
if (!CUDIE)
continue;
if (auto StmtOffset =
dwarf::toSectionOffset(CUDIE.find(dwarf::DW_AT_stmt_list))) {
DWARFYAML::LineTable DebugLines;
DataExtractor LineData(DCtx.getDWARFObj().getLineSection().Data,
DCtx.isLittleEndian(), CU->getAddressByteSize());
uint64_t Offset = *StmtOffset;
uint64_t LengthOrDWARF64Prefix = LineData.getU32(&Offset);
if (LengthOrDWARF64Prefix == dwarf::DW_LENGTH_DWARF64) {
DebugLines.Format = dwarf::DWARF64;
DebugLines.Length = LineData.getU64(&Offset);
} else {
DebugLines.Format = dwarf::DWARF32;
DebugLines.Length = LengthOrDWARF64Prefix;
}
uint64_t LineTableLength = DebugLines.Length;
uint64_t SizeOfPrologueLength =
DebugLines.Format == dwarf::DWARF64 ? 8 : 4;
DebugLines.Version = LineData.getU16(&Offset);
DebugLines.PrologueLength =
LineData.getUnsigned(&Offset, SizeOfPrologueLength);
const uint64_t EndPrologue = DebugLines.PrologueLength + Offset;
DebugLines.MinInstLength = LineData.getU8(&Offset);
if (DebugLines.Version >= 4)
DebugLines.MaxOpsPerInst = LineData.getU8(&Offset);
DebugLines.DefaultIsStmt = LineData.getU8(&Offset);
DebugLines.LineBase = LineData.getU8(&Offset);
DebugLines.LineRange = LineData.getU8(&Offset);
DebugLines.OpcodeBase = LineData.getU8(&Offset);
DebugLines.StandardOpcodeLengths.reserve(DebugLines.OpcodeBase - 1);
for (uint8_t i = 1; i < DebugLines.OpcodeBase; ++i)
DebugLines.StandardOpcodeLengths.push_back(LineData.getU8(&Offset));
while (Offset < EndPrologue) {
StringRef Dir = LineData.getCStr(&Offset);
if (!Dir.empty())
DebugLines.IncludeDirs.push_back(Dir);
else
break;
}
while (Offset < EndPrologue) {
DWARFYAML::File TmpFile;
if (dumpFileEntry(LineData, Offset, TmpFile))
DebugLines.Files.push_back(TmpFile);
else
break;
}
const uint64_t LineEnd =
LineTableLength + *StmtOffset + SizeOfPrologueLength;
while (Offset < LineEnd) {
DWARFYAML::LineTableOpcode NewOp = {};
NewOp.Opcode = (dwarf::LineNumberOps)LineData.getU8(&Offset);
if (NewOp.Opcode == 0) {
auto StartExt = Offset;
NewOp.ExtLen = LineData.getULEB128(&Offset);
NewOp.SubOpcode =
(dwarf::LineNumberExtendedOps)LineData.getU8(&Offset);
switch (NewOp.SubOpcode) {
case dwarf::DW_LNE_set_address:
case dwarf::DW_LNE_set_discriminator:
NewOp.Data = LineData.getAddress(&Offset);
break;
case dwarf::DW_LNE_define_file:
dumpFileEntry(LineData, Offset, NewOp.FileEntry);
break;
case dwarf::DW_LNE_end_sequence:
break;
default:
while (Offset < StartExt + NewOp.ExtLen)
NewOp.UnknownOpcodeData.push_back(LineData.getU8(&Offset));
}
} else if (NewOp.Opcode < DebugLines.OpcodeBase) {
switch (NewOp.Opcode) {
case dwarf::DW_LNS_copy:
case dwarf::DW_LNS_negate_stmt:
case dwarf::DW_LNS_set_basic_block:
case dwarf::DW_LNS_const_add_pc:
case dwarf::DW_LNS_set_prologue_end:
case dwarf::DW_LNS_set_epilogue_begin:
break;
case dwarf::DW_LNS_advance_pc:
case dwarf::DW_LNS_set_file:
case dwarf::DW_LNS_set_column:
case dwarf::DW_LNS_set_isa:
NewOp.Data = LineData.getULEB128(&Offset);
break;
case dwarf::DW_LNS_advance_line:
NewOp.SData = LineData.getSLEB128(&Offset);
break;
case dwarf::DW_LNS_fixed_advance_pc:
NewOp.Data = LineData.getU16(&Offset);
break;
default:
for (uint8_t i = 0;
i < DebugLines.StandardOpcodeLengths[NewOp.Opcode - 1]; ++i)
NewOp.StandardOpcodeData.push_back(LineData.getULEB128(&Offset));
}
}
DebugLines.Opcodes.push_back(NewOp);
}
Y.DebugLines.push_back(DebugLines);
}
}
}
llvm::Error dwarf2yaml(DWARFContext &DCtx, DWARFYAML::Data &Y) {
dumpDebugAbbrev(DCtx, Y);
dumpDebugStrings(DCtx, Y);
if (Error E = dumpDebugARanges(DCtx, Y))
return E;
if (Error E = dumpDebugRanges(DCtx, Y))
return E;
dumpDebugPubSections(DCtx, Y);
dumpDebugInfo(DCtx, Y);
dumpDebugLines(DCtx, Y);
return ErrorSuccess();
}
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