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//===------ dwarf2yaml.cpp - obj2yaml conversion tool -----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#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 dumpDebugAbbrev(DWARFContextInMemory &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;
Abbrv.Attributes.push_back(AttAbrv);
}
Y.AbbrevDecls.push_back(Abbrv);
}
}
}
}
void dumpDebugStrings(DWARFContextInMemory &DCtx, DWARFYAML::Data &Y) {
StringRef RemainingTable = DCtx.getStringSection();
while (RemainingTable.size() > 0) {
auto SymbolPair = RemainingTable.split('\0');
RemainingTable = SymbolPair.second;
Y.DebugStrings.push_back(SymbolPair.first);
}
}
void dumpDebugARanges(DWARFContextInMemory &DCtx, DWARFYAML::Data &Y) {
DataExtractor ArangesData(DCtx.getARangeSection(), DCtx.isLittleEndian(), 0);
uint32_t Offset = 0;
DWARFDebugArangeSet Set;
while (Set.extract(ArangesData, &Offset)) {
DWARFYAML::ARange Range;
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);
}
}
void dumpPubSection(DWARFContextInMemory &DCtx, DWARFYAML::PubSection &Y,
StringRef Section) {
DataExtractor PubSectionData(Section, DCtx.isLittleEndian(), 0);
uint32_t Offset = 0;
Y.Length = PubSectionData.getU32(&Offset);
Y.Version = PubSectionData.getU16(&Offset);
Y.UnitOffset = PubSectionData.getU32(&Offset);
Y.UnitSize = PubSectionData.getU32(&Offset);
while (Offset < Y.Length) {
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(DWARFContextInMemory &DCtx, DWARFYAML::Data &Y) {
Y.PubNames.IsGNUStyle = false;
dumpPubSection(DCtx, Y.PubNames, DCtx.getPubNamesSection());
Y.PubTypes.IsGNUStyle = false;
dumpPubSection(DCtx, Y.PubTypes, DCtx.getPubTypesSection());
Y.GNUPubNames.IsGNUStyle = true;
dumpPubSection(DCtx, Y.GNUPubNames, DCtx.getGnuPubNamesSection());
Y.GNUPubTypes.IsGNUStyle = true;
dumpPubSection(DCtx, Y.GNUPubTypes, DCtx.getGnuPubTypesSection());
}
void dumpDebugInfo(DWARFContextInMemory &DCtx, DWARFYAML::Data &Y) {
for (const auto &CU : DCtx.compile_units()) {
DWARFYAML::Unit NewUnit;
NewUnit.Length = CU->getLength();
NewUnit.Version = CU->getVersion();
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.getAttributeValue(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:
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_ref_sup:
case dwarf::DW_FORM_GNU_str_index:
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);
}
}
std::error_code dwarf2yaml(DWARFContextInMemory &DCtx, DWARFYAML::Data &Y) {
dumpDebugAbbrev(DCtx, Y);
dumpDebugStrings(DCtx, Y);
dumpDebugARanges(DCtx, Y);
dumpDebugPubSections(DCtx, Y);
dumpDebugInfo(DCtx, Y);
return obj2yaml_error::success;
}
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