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llvm-mirror/lib/ObjectYAML/DWARFEmitter.cpp
Benjamin Kramer bfaa3adccc Move symbols from the global namespace into (anonymous) namespaces. NFC. 
llvm-svn: 294837
2017-02-11 11:06:55 +00:00

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//===- DWARFEmitter - 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. Provided as library code for tests.
///
//===----------------------------------------------------------------------===//
#include "llvm/ObjectYAML/DWARFEmitter.h"
#include "llvm/ObjectYAML/DWARFYAML.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/SwapByteOrder.h"
#include <algorithm>
using namespace llvm;
template <typename T>
static void writeInteger(T Integer, raw_ostream &OS, bool IsLittleEndian) {
if (IsLittleEndian != sys::IsLittleEndianHost)
sys::swapByteOrder(Integer);
OS.write(reinterpret_cast<char *>(&Integer), sizeof(T));
}
static void writeVariableSizedInteger(uint64_t Integer, size_t Size,
raw_ostream &OS, bool IsLittleEndian) {
if (8 == Size)
writeInteger((uint64_t)Integer, OS, IsLittleEndian);
else if (4 == Size)
writeInteger((uint32_t)Integer, OS, IsLittleEndian);
else if (2 == Size)
writeInteger((uint16_t)Integer, OS, IsLittleEndian);
else if (1 == Size)
writeInteger((uint8_t)Integer, OS, IsLittleEndian);
else
assert(false && "Invalid integer write size.");
}
static 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 DWARFYAML::EmitDebugStr(raw_ostream &OS, const DWARFYAML::Data &DI) {
for (auto Str : DI.DebugStrings) {
OS.write(Str.data(), Str.size());
OS.write('\0');
}
}
void DWARFYAML::EmitDebugAbbrev(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 DWARFYAML::EmitDebugAranges(raw_ostream &OS, const DWARFYAML::Data &DI) {
for (auto Range : DI.ARanges) {
auto HeaderStart = OS.tell();
writeInteger((uint32_t)Range.Length, OS, DI.IsLittleEndian);
writeInteger((uint16_t)Range.Version, OS, DI.IsLittleEndian);
writeInteger((uint32_t)Range.CuOffset, OS, DI.IsLittleEndian);
writeInteger((uint8_t)Range.AddrSize, OS, DI.IsLittleEndian);
writeInteger((uint8_t)Range.SegSize, OS, DI.IsLittleEndian);
auto HeaderSize = OS.tell() - HeaderStart;
auto FirstDescriptor = alignTo(HeaderSize, Range.AddrSize * 2);
ZeroFillBytes(OS, FirstDescriptor - HeaderSize);
for (auto Descriptor : Range.Descriptors) {
writeVariableSizedInteger(Descriptor.Address, Range.AddrSize, OS,
DI.IsLittleEndian);
writeVariableSizedInteger(Descriptor.Length, Range.AddrSize, OS,
DI.IsLittleEndian);
}
ZeroFillBytes(OS, Range.AddrSize * 2);
}
}
void DWARFYAML::EmitPubSection(raw_ostream &OS,
const DWARFYAML::PubSection &Sect,
bool IsLittleEndian) {
writeInteger((uint32_t)Sect.Length, OS, IsLittleEndian);
writeInteger((uint16_t)Sect.Version, OS, IsLittleEndian);
writeInteger((uint32_t)Sect.UnitOffset, OS, IsLittleEndian);
writeInteger((uint32_t)Sect.UnitSize, OS, IsLittleEndian);
for (auto Entry : Sect.Entries) {
writeInteger((uint32_t)Entry.DieOffset, OS, IsLittleEndian);
if (Sect.IsGNUStyle)
writeInteger((uint32_t)Entry.Descriptor, OS, IsLittleEndian);
OS.write(Entry.Name.data(), Entry.Name.size());
OS.write('\0');
}
}
void DWARFYAML::EmitDebugInfo(raw_ostream &OS, const DWARFYAML::Data &DI) {
for (auto CU : DI.CompileUnits) {
writeInteger((uint32_t)CU.Length, OS, DI.IsLittleEndian);
writeInteger((uint16_t)CU.Version, OS, DI.IsLittleEndian);
writeInteger((uint32_t)CU.AbbrOffset, OS, DI.IsLittleEndian);
writeInteger((uint8_t)CU.AddrSize, OS, DI.IsLittleEndian);
auto FirstAbbrevCode = CU.Entries[0].AbbrCode;
for (auto Entry : CU.Entries) {
encodeULEB128(Entry.AbbrCode, OS);
if (Entry.AbbrCode == 0u)
continue;
bool Indirect = false;
assert(Entry.AbbrCode - FirstAbbrevCode < DI.AbbrevDecls.size() &&
"Out of range AbbCode");
auto &Abbrev = DI.AbbrevDecls[Entry.AbbrCode - FirstAbbrevCode];
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 {
Indirect = false;
switch (Form) {
case dwarf::DW_FORM_addr:
writeVariableSizedInteger(FormVal->Value, CU.AddrSize, OS,
DI.IsLittleEndian);
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;
writeVariableSizedInteger(FormVal->Value, writeSize, OS,
DI.IsLittleEndian);
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();
writeInteger((uint8_t)writeSize, OS, DI.IsLittleEndian);
OS.write(reinterpret_cast<char *>(&FormVal->BlockData[0]),
FormVal->BlockData.size());
break;
}
case dwarf::DW_FORM_block2: {
auto writeSize = FormVal->BlockData.size();
writeInteger((uint16_t)writeSize, OS, DI.IsLittleEndian);
OS.write(reinterpret_cast<char *>(&FormVal->BlockData[0]),
FormVal->BlockData.size());
break;
}
case dwarf::DW_FORM_block4: {
auto writeSize = FormVal->BlockData.size();
writeInteger((uint32_t)writeSize, OS, DI.IsLittleEndian);
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:
writeInteger((uint8_t)FormVal->Value, OS, DI.IsLittleEndian);
break;
case dwarf::DW_FORM_data2:
case dwarf::DW_FORM_ref2:
writeInteger((uint16_t)FormVal->Value, OS, DI.IsLittleEndian);
break;
case dwarf::DW_FORM_data4:
case dwarf::DW_FORM_ref4:
writeInteger((uint32_t)FormVal->Value, OS, DI.IsLittleEndian);
break;
case dwarf::DW_FORM_data8:
case dwarf::DW_FORM_ref8:
writeInteger((uint64_t)FormVal->Value, OS, DI.IsLittleEndian);
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
writeInteger((uint32_t)FormVal->Value, OS, DI.IsLittleEndian);
break;
case dwarf::DW_FORM_ref_sig8:
writeInteger((uint64_t)FormVal->Value, OS, DI.IsLittleEndian);
break;
case dwarf::DW_FORM_GNU_addr_index:
case dwarf::DW_FORM_GNU_str_index:
encodeULEB128(FormVal->Value, OS);
break;
default:
break;
}
} while (Indirect);
}
}
}
}
static void EmitFileEntry(raw_ostream &OS, const DWARFYAML::File &File) {
OS.write(File.Name.data(), File.Name.size());
OS.write('\0');
encodeULEB128(File.DirIdx, OS);
encodeULEB128(File.ModTime, OS);
encodeULEB128(File.Length, OS);
}
void DWARFYAML::EmitDebugLine(raw_ostream &OS, const DWARFYAML::Data &DI) {
for (const auto &LineTable : DI.DebugLines) {
writeInteger((uint32_t)LineTable.TotalLength, OS, DI.IsLittleEndian);
uint64_t SizeOfPrologueLength = 4;
if (LineTable.TotalLength == UINT32_MAX) {
writeInteger((uint64_t)LineTable.TotalLength64, OS, DI.IsLittleEndian);
SizeOfPrologueLength = 8;
}
writeInteger((uint16_t)LineTable.Version, OS, DI.IsLittleEndian);
writeVariableSizedInteger(LineTable.PrologueLength, SizeOfPrologueLength,
OS, DI.IsLittleEndian);
writeInteger((uint8_t)LineTable.MinInstLength, OS, DI.IsLittleEndian);
if (LineTable.Version >= 4)
writeInteger((uint8_t)LineTable.MaxOpsPerInst, OS, DI.IsLittleEndian);
writeInteger((uint8_t)LineTable.DefaultIsStmt, OS, DI.IsLittleEndian);
writeInteger((uint8_t)LineTable.LineBase, OS, DI.IsLittleEndian);
writeInteger((uint8_t)LineTable.LineRange, OS, DI.IsLittleEndian);
writeInteger((uint8_t)LineTable.OpcodeBase, OS, DI.IsLittleEndian);
for (auto OpcodeLength : LineTable.StandardOpcodeLengths)
writeInteger((uint8_t)OpcodeLength, OS, DI.IsLittleEndian);
for (auto IncludeDir : LineTable.IncludeDirs) {
OS.write(IncludeDir.data(), IncludeDir.size());
OS.write('\0');
}
OS.write('\0');
for (auto File : LineTable.Files)
EmitFileEntry(OS, File);
OS.write('\0');
for (auto Op : LineTable.Opcodes) {
writeInteger((uint8_t)Op.Opcode, OS, DI.IsLittleEndian);
if (Op.Opcode == 0) {
encodeULEB128(Op.ExtLen, OS);
writeInteger((uint8_t)Op.SubOpcode, OS, DI.IsLittleEndian);
switch (Op.SubOpcode) {
case dwarf::DW_LNE_set_address:
case dwarf::DW_LNE_set_discriminator:
writeVariableSizedInteger(Op.Data, DI.CompileUnits[0].AddrSize, OS,
DI.IsLittleEndian);
break;
case dwarf::DW_LNE_define_file:
EmitFileEntry(OS, Op.FileEntry);
break;
case dwarf::DW_LNE_end_sequence:
break;
default:
for (auto OpByte : Op.UnknownOpcodeData)
writeInteger((uint8_t)OpByte, OS, DI.IsLittleEndian);
}
} else if (Op.Opcode < LineTable.OpcodeBase) {
switch (Op.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:
encodeULEB128(Op.Data, OS);
break;
case dwarf::DW_LNS_advance_line:
encodeSLEB128(Op.SData, OS);
break;
case dwarf::DW_LNS_fixed_advance_pc:
writeInteger((uint16_t)Op.Data, OS, DI.IsLittleEndian);
break;
default:
for (auto OpData : Op.StandardOpcodeData) {
encodeULEB128(OpData, OS);
}
}
}
}
}
}
typedef void (*EmitFuncType)(raw_ostream &, const DWARFYAML::Data &);
static void
EmitDebugSectionImpl(const DWARFYAML::Data &DI, EmitFuncType EmitFunc,
StringRef Sec,
StringMap<std::unique_ptr<MemoryBuffer>> &OutputBuffers) {
std::string Data;
raw_string_ostream DebugInfoStream(Data);
EmitFunc(DebugInfoStream, DI);
DebugInfoStream.flush();
if (!Data.empty())
OutputBuffers[Sec] = MemoryBuffer::getMemBufferCopy(Data);
}
Expected<StringMap<std::unique_ptr<MemoryBuffer>>>
DWARFYAML::EmitDebugSections(StringRef YAMLString,
bool IsLittleEndian) {
StringMap<std::unique_ptr<MemoryBuffer>> DebugSections;
yaml::Input YIn(YAMLString);
DWARFYAML::Data DI;
DI.IsLittleEndian = IsLittleEndian;
YIn >> DI;
if (YIn.error())
return errorCodeToError(YIn.error());
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugInfo, "debug_info",
DebugSections);
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugLine, "debug_line",
DebugSections);
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugStr, "debug_str",
DebugSections);
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugAbbrev, "debug_abbrev",
DebugSections);
EmitDebugSectionImpl(DI, &DWARFYAML::EmitDebugAranges, "debug_aranges",
DebugSections);
return std::move(DebugSections);
}
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