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|
//===- yaml2dwarf - Convert YAML to DWARF binary data ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief The DWARF component of yaml2obj.
///
//===----------------------------------------------------------------------===//
#include "llvm/ObjectYAML/DWARFYAML.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
using namespace llvm;
void ZeroFillBytes(raw_ostream &OS, size_t Size) {
std::vector<uint8_t> FillData;
FillData.insert(FillData.begin(), Size, 0);
OS.write(reinterpret_cast<char *>(FillData.data()), Size);
}
void yaml2debug_str(raw_ostream &OS, const DWARFYAML::Data &DI) {
for (auto Str : DI.DebugStrings) {
OS.write(Str.data(), Str.size());
OS.write('\0');
}
}
void yaml2debug_abbrev(raw_ostream &OS, const DWARFYAML::Data &DI) {
for (auto AbbrevDecl : DI.AbbrevDecls) {
encodeULEB128(AbbrevDecl.Code, OS);
encodeULEB128(AbbrevDecl.Tag, OS);
OS.write(AbbrevDecl.Children);
for (auto Attr : AbbrevDecl.Attributes) {
encodeULEB128(Attr.Attribute, OS);
encodeULEB128(Attr.Form, OS);
}
encodeULEB128(0, OS);
encodeULEB128(0, OS);
}
}
void yaml2debug_aranges(raw_ostream &OS, const DWARFYAML::Data &DI) {
for (auto Range : DI.ARanges) {
auto HeaderStart = OS.tell();
OS.write(reinterpret_cast<char *>(&Range.Length), 4);
OS.write(reinterpret_cast<char *>(&Range.Version), 2);
OS.write(reinterpret_cast<char *>(&Range.CuOffset), 4);
OS.write(reinterpret_cast<char *>(&Range.AddrSize), 1);
OS.write(reinterpret_cast<char *>(&Range.SegSize), 1);
auto HeaderSize = OS.tell() - HeaderStart;
auto FirstDescriptor = alignTo(HeaderSize, Range.AddrSize * 2);
ZeroFillBytes(OS, FirstDescriptor - HeaderSize);
for (auto Descriptor : Range.Descriptors) {
OS.write(reinterpret_cast<char *>(&Descriptor.Address), Range.AddrSize);
OS.write(reinterpret_cast<char *>(&Descriptor.Length), Range.AddrSize);
}
ZeroFillBytes(OS, Range.AddrSize * 2);
}
}
void yaml2pubsection(raw_ostream &OS, const DWARFYAML::PubSection &Sect) {
OS.write(reinterpret_cast<const char *>(&Sect.Length), 4);
OS.write(reinterpret_cast<const char *>(&Sect.Version), 2);
OS.write(reinterpret_cast<const char *>(&Sect.UnitOffset), 4);
OS.write(reinterpret_cast<const char *>(&Sect.UnitSize), 4);
for (auto Entry : Sect.Entries) {
OS.write(reinterpret_cast<const char *>(&Entry.DieOffset), 4);
if (Sect.IsGNUStyle)
OS.write(reinterpret_cast<const char *>(&Entry.Descriptor), 4);
OS.write(Entry.Name.data(), Entry.Name.size());
OS.write('\0');
}
}
void yaml2debug_info(raw_ostream &OS, const DWARFYAML::Data &DI) {
for (auto CU : DI.CompileUnits) {
OS.write(reinterpret_cast<char *>(&CU.Length), 4);
OS.write(reinterpret_cast<char *>(&CU.Version), 2);
OS.write(reinterpret_cast<char *>(&CU.AbbrOffset), 4);
OS.write(reinterpret_cast<char *>(&CU.AddrSize), 1);
for (auto Entry : CU.Entries) {
encodeULEB128(Entry.AbbrCode, OS);
bool Indirect = false;
auto &Abbrev = DI.AbbrevDecls[Entry.AbbrCode-1];
auto FormVal = Entry.Values.begin();
auto AbbrForm = Abbrev.Attributes.begin();
for (;
FormVal != Entry.Values.end() && AbbrForm != Abbrev.Attributes.end();
++FormVal, ++AbbrForm) {
dwarf::Form Form = AbbrForm->Form;
do {
bool Indirect = false;
switch (Form) {
case dwarf::DW_FORM_addr:
OS.write(reinterpret_cast<char *>(&FormVal->Value), CU.AddrSize);
break;
case dwarf::DW_FORM_ref_addr: {
// TODO: Handle DWARF32/DWARF64 after Line Table data is done
auto writeSize = CU.Version == 2 ? CU.AddrSize : 4;
OS.write(reinterpret_cast<char *>(&FormVal->Value), writeSize);
break;
}
case dwarf::DW_FORM_exprloc:
case dwarf::DW_FORM_block:
encodeULEB128(FormVal->BlockData.size(), OS);
OS.write(reinterpret_cast<char *>(&FormVal->BlockData[0]),
FormVal->BlockData.size());
break;
case dwarf::DW_FORM_block1: {
auto writeSize = FormVal->BlockData.size();
OS.write(reinterpret_cast<char *>(&writeSize), 1);
OS.write(reinterpret_cast<char *>(&FormVal->BlockData[0]),
FormVal->BlockData.size());
break;
}
case dwarf::DW_FORM_block2: {
auto writeSize = FormVal->BlockData.size();
OS.write(reinterpret_cast<char *>(&writeSize), 2);
OS.write(reinterpret_cast<char *>(&FormVal->BlockData[0]),
FormVal->BlockData.size());
break;
}
case dwarf::DW_FORM_block4: {
auto writeSize = FormVal->BlockData.size();
OS.write(reinterpret_cast<char *>(&writeSize), 4);
OS.write(reinterpret_cast<char *>(&FormVal->BlockData[0]),
FormVal->BlockData.size());
break;
}
case dwarf::DW_FORM_data1:
case dwarf::DW_FORM_ref1:
case dwarf::DW_FORM_flag:
OS.write(reinterpret_cast<char *>(&FormVal->Value), 1);
break;
case dwarf::DW_FORM_data2:
case dwarf::DW_FORM_ref2:
OS.write(reinterpret_cast<char *>(&FormVal->Value), 2);
break;
case dwarf::DW_FORM_data4:
case dwarf::DW_FORM_ref4:
OS.write(reinterpret_cast<char *>(&FormVal->Value), 4);
break;
case dwarf::DW_FORM_data8:
case dwarf::DW_FORM_ref8:
OS.write(reinterpret_cast<char *>(&FormVal->Value), 8);
break;
case dwarf::DW_FORM_sdata:
encodeSLEB128(FormVal->Value, OS);
break;
case dwarf::DW_FORM_udata:
case dwarf::DW_FORM_ref_udata:
encodeULEB128(FormVal->Value, OS);
break;
case dwarf::DW_FORM_string:
OS.write(FormVal->CStr.data(), FormVal->CStr.size());
OS.write('\0');
break;
case dwarf::DW_FORM_indirect:
encodeULEB128(FormVal->Value, OS);
Indirect = true;
Form = static_cast<dwarf::Form>((uint64_t)FormVal->Value);
++FormVal;
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:
// TODO: Handle DWARF32/64
OS.write(reinterpret_cast<char *>(&FormVal->Value), 4);
break;
case dwarf::DW_FORM_ref_sig8:
OS.write(reinterpret_cast<char *>(&FormVal->Value), 8);
break;
case dwarf::DW_FORM_GNU_addr_index:
case dwarf::DW_FORM_GNU_str_index:
encodeULEB128(FormVal->Value, OS);
break;
default:
break;
}
} while (Indirect);
}
}
}
}
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