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llvm-mirror/tools/obj2yaml/dwarf2yaml.cpp
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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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/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugArangeSet.h"
#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
#include "llvm/ObjectYAML/DWARFYAML.h"
#include <algorithm>
using namespace llvm;
void dumpInitialLength(DataExtractor &Data, uint32_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().getStringSection();
while (RemainingTable.size() > 0) {
auto SymbolPair = RemainingTable.split('\0');
RemainingTable = SymbolPair.second;
Y.DebugStrings.push_back(SymbolPair.first);
}
}
void dumpDebugARanges(DWARFContext &DCtx, DWARFYAML::Data &Y) {
DataExtractor ArangesData(DCtx.getDWARFObj().getARangeSection(),
DCtx.isLittleEndian(), 0);
uint32_t Offset = 0;
DWARFDebugArangeSet Set;
while (Set.extract(ArangesData, &Offset)) {
DWARFYAML::ARange Range;
Range.Length.setLength(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);
}
}
void dumpPubSection(DWARFContext &DCtx, DWARFYAML::PubSection &Y,
DWARFSection Section) {
DWARFDataExtractor PubSectionData(DCtx.getDWARFObj(), Section,
DCtx.isLittleEndian(), 0);
uint32_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 (Y.IsGNUStyle)
NewEntry.Descriptor = PubSectionData.getU8(&Offset);
NewEntry.Name = PubSectionData.getCStr(&Offset);
Y.Entries.push_back(NewEntry);
}
}
void dumpDebugPubSections(DWARFContext &DCtx, DWARFYAML::Data &Y) {
const DWARFObject &D = DCtx.getDWARFObj();
Y.PubNames.IsGNUStyle = false;
dumpPubSection(DCtx, Y.PubNames, D.getPubNamesSection());
Y.PubTypes.IsGNUStyle = false;
dumpPubSection(DCtx, Y.PubTypes, D.getPubTypesSection());
Y.GNUPubNames.IsGNUStyle = true;
dumpPubSection(DCtx, Y.GNUPubNames, D.getGnuPubNamesSection());
Y.GNUPubTypes.IsGNUStyle = true;
dumpPubSection(DCtx, Y.GNUPubTypes, D.getGnuPubTypesSection());
}
void dumpDebugInfo(DWARFContext &DCtx, DWARFYAML::Data &Y) {
for (const auto &CU : DCtx.compile_units()) {
DWARFYAML::Unit NewUnit;
NewUnit.Length.setLength(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();
uint32_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, uint32_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());
uint32_t Offset = *StmtOffset;
dumpInitialLength(LineData, Offset, DebugLines.Length);
uint64_t LineTableLength = DebugLines.Length.getLength();
uint64_t SizeOfPrologueLength = DebugLines.Length.isDWARF64() ? 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);
}
}
}
std::error_code dwarf2yaml(DWARFContext &DCtx, DWARFYAML::Data &Y) {
dumpDebugAbbrev(DCtx, Y);
dumpDebugStrings(DCtx, Y);
dumpDebugARanges(DCtx, Y);
dumpDebugPubSections(DCtx, Y);
dumpDebugInfo(DCtx, Y);
dumpDebugLines(DCtx, Y);
return obj2yaml_error::success;
}
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