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6c9c3a7a3c
One more try... relanding r291541 with a fix to properly gate MaxOpsPerInst on DWARF version. Description from r291541: This patch re-lands r291470, which failed on Linux bots. The issue (I believe) was undefined behavior because the size of llvm::dwarf::LineNumberOps was not explcitly specified or consistently respected. The updated patch adds an explcit underlying type to the enum and preserves the size more correctly. Original description: This patch adds support for the DWARF debug_lines section. The line table state machine opcodes are preserved, so this can be used to test the state machine evaluation directly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291546 91177308-0d34-0410-b5e6-96231b3b80d8
331 lines
12 KiB
C++
331 lines
12 KiB
C++
//===- yaml2dwarf - Convert YAML to DWARF binary data ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// \brief The DWARF component of yaml2obj.
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///
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//===----------------------------------------------------------------------===//
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#include "llvm/ObjectYAML/DWARFYAML.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/LEB128.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/SwapByteOrder.h"
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#include <algorithm>
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using namespace llvm;
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template <typename T>
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void writeInteger(T Integer, raw_ostream &OS, bool IsLittleEndian) {
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if (IsLittleEndian != sys::IsLittleEndianHost)
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sys::swapByteOrder(Integer);
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OS.write(reinterpret_cast<char *>(&Integer), sizeof(T));
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}
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void writeVariableSizedInteger(uint64_t Integer, size_t Size, raw_ostream &OS,
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bool IsLittleEndian) {
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if (8 == Size)
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writeInteger((uint64_t)Integer, OS, IsLittleEndian);
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else if (4 == Size)
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writeInteger((uint32_t)Integer, OS, IsLittleEndian);
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else if (2 == Size)
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writeInteger((uint16_t)Integer, OS, IsLittleEndian);
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else if (1 == Size)
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writeInteger((uint8_t)Integer, OS, IsLittleEndian);
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else
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assert(false && "Invalid integer write size.");
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}
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void ZeroFillBytes(raw_ostream &OS, size_t Size) {
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std::vector<uint8_t> FillData;
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FillData.insert(FillData.begin(), Size, 0);
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OS.write(reinterpret_cast<char *>(FillData.data()), Size);
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}
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void yaml2debug_str(raw_ostream &OS, const DWARFYAML::Data &DI) {
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for (auto Str : DI.DebugStrings) {
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OS.write(Str.data(), Str.size());
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OS.write('\0');
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}
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}
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void yaml2debug_abbrev(raw_ostream &OS, const DWARFYAML::Data &DI) {
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for (auto AbbrevDecl : DI.AbbrevDecls) {
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encodeULEB128(AbbrevDecl.Code, OS);
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encodeULEB128(AbbrevDecl.Tag, OS);
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OS.write(AbbrevDecl.Children);
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for (auto Attr : AbbrevDecl.Attributes) {
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encodeULEB128(Attr.Attribute, OS);
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encodeULEB128(Attr.Form, OS);
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}
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encodeULEB128(0, OS);
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encodeULEB128(0, OS);
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}
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}
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void yaml2debug_aranges(raw_ostream &OS, const DWARFYAML::Data &DI) {
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for (auto Range : DI.ARanges) {
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auto HeaderStart = OS.tell();
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writeInteger((uint32_t)Range.Length, OS, DI.IsLittleEndian);
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writeInteger((uint16_t)Range.Version, OS, DI.IsLittleEndian);
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writeInteger((uint32_t)Range.CuOffset, OS, DI.IsLittleEndian);
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writeInteger((uint8_t)Range.AddrSize, OS, DI.IsLittleEndian);
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writeInteger((uint8_t)Range.SegSize, OS, DI.IsLittleEndian);
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auto HeaderSize = OS.tell() - HeaderStart;
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auto FirstDescriptor = alignTo(HeaderSize, Range.AddrSize * 2);
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ZeroFillBytes(OS, FirstDescriptor - HeaderSize);
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for (auto Descriptor : Range.Descriptors) {
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writeVariableSizedInteger(Descriptor.Address, Range.AddrSize, OS,
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DI.IsLittleEndian);
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writeVariableSizedInteger(Descriptor.Length, Range.AddrSize, OS,
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DI.IsLittleEndian);
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}
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ZeroFillBytes(OS, Range.AddrSize * 2);
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}
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}
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void yaml2pubsection(raw_ostream &OS, const DWARFYAML::PubSection &Sect,
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bool IsLittleEndian) {
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writeInteger((uint32_t)Sect.Length, OS, IsLittleEndian);
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writeInteger((uint16_t)Sect.Version, OS, IsLittleEndian);
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writeInteger((uint32_t)Sect.UnitOffset, OS, IsLittleEndian);
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writeInteger((uint32_t)Sect.UnitSize, OS, IsLittleEndian);
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for (auto Entry : Sect.Entries) {
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writeInteger((uint32_t)Entry.DieOffset, OS, IsLittleEndian);
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if (Sect.IsGNUStyle)
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writeInteger((uint32_t)Entry.Descriptor, OS, IsLittleEndian);
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OS.write(Entry.Name.data(), Entry.Name.size());
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OS.write('\0');
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}
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}
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void yaml2debug_info(raw_ostream &OS, const DWARFYAML::Data &DI) {
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for (auto CU : DI.CompileUnits) {
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writeInteger((uint32_t)CU.Length, OS, DI.IsLittleEndian);
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writeInteger((uint16_t)CU.Version, OS, DI.IsLittleEndian);
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writeInteger((uint32_t)CU.AbbrOffset, OS, DI.IsLittleEndian);
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writeInteger((uint8_t)CU.AddrSize, OS, DI.IsLittleEndian);
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auto FirstAbbrevCode = CU.Entries[0].AbbrCode;
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for (auto Entry : CU.Entries) {
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encodeULEB128(Entry.AbbrCode, OS);
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if (Entry.AbbrCode == 0u)
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continue;
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bool Indirect = false;
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assert(Entry.AbbrCode - FirstAbbrevCode < DI.AbbrevDecls.size() &&
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"Out of range AbbCode");
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auto &Abbrev = DI.AbbrevDecls[Entry.AbbrCode - FirstAbbrevCode];
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auto FormVal = Entry.Values.begin();
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auto AbbrForm = Abbrev.Attributes.begin();
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for (;
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FormVal != Entry.Values.end() && AbbrForm != Abbrev.Attributes.end();
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++FormVal, ++AbbrForm) {
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dwarf::Form Form = AbbrForm->Form;
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do {
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Indirect = false;
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switch (Form) {
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case dwarf::DW_FORM_addr:
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writeVariableSizedInteger(FormVal->Value, CU.AddrSize, OS,
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DI.IsLittleEndian);
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break;
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case dwarf::DW_FORM_ref_addr: {
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// TODO: Handle DWARF32/DWARF64 after Line Table data is done
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auto writeSize = CU.Version == 2 ? CU.AddrSize : 4;
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writeVariableSizedInteger(FormVal->Value, writeSize, OS,
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DI.IsLittleEndian);
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break;
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}
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case dwarf::DW_FORM_exprloc:
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case dwarf::DW_FORM_block:
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encodeULEB128(FormVal->BlockData.size(), OS);
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OS.write(reinterpret_cast<char *>(&FormVal->BlockData[0]),
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FormVal->BlockData.size());
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break;
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case dwarf::DW_FORM_block1: {
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auto writeSize = FormVal->BlockData.size();
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writeInteger((uint8_t)writeSize, OS, DI.IsLittleEndian);
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OS.write(reinterpret_cast<char *>(&FormVal->BlockData[0]),
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FormVal->BlockData.size());
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break;
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}
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case dwarf::DW_FORM_block2: {
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auto writeSize = FormVal->BlockData.size();
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writeInteger((uint16_t)writeSize, OS, DI.IsLittleEndian);
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OS.write(reinterpret_cast<char *>(&FormVal->BlockData[0]),
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FormVal->BlockData.size());
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break;
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}
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case dwarf::DW_FORM_block4: {
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auto writeSize = FormVal->BlockData.size();
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writeInteger((uint32_t)writeSize, OS, DI.IsLittleEndian);
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OS.write(reinterpret_cast<char *>(&FormVal->BlockData[0]),
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FormVal->BlockData.size());
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break;
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}
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case dwarf::DW_FORM_data1:
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case dwarf::DW_FORM_ref1:
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case dwarf::DW_FORM_flag:
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writeInteger((uint8_t)FormVal->Value, OS, DI.IsLittleEndian);
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break;
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case dwarf::DW_FORM_data2:
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case dwarf::DW_FORM_ref2:
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writeInteger((uint16_t)FormVal->Value, OS, DI.IsLittleEndian);
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break;
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case dwarf::DW_FORM_data4:
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case dwarf::DW_FORM_ref4:
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writeInteger((uint32_t)FormVal->Value, OS, DI.IsLittleEndian);
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break;
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case dwarf::DW_FORM_data8:
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case dwarf::DW_FORM_ref8:
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writeInteger((uint64_t)FormVal->Value, OS, DI.IsLittleEndian);
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break;
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case dwarf::DW_FORM_sdata:
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encodeSLEB128(FormVal->Value, OS);
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break;
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case dwarf::DW_FORM_udata:
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case dwarf::DW_FORM_ref_udata:
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encodeULEB128(FormVal->Value, OS);
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break;
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case dwarf::DW_FORM_string:
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OS.write(FormVal->CStr.data(), FormVal->CStr.size());
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OS.write('\0');
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break;
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case dwarf::DW_FORM_indirect:
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encodeULEB128(FormVal->Value, OS);
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Indirect = true;
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Form = static_cast<dwarf::Form>((uint64_t)FormVal->Value);
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++FormVal;
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break;
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case dwarf::DW_FORM_strp:
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case dwarf::DW_FORM_sec_offset:
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case dwarf::DW_FORM_GNU_ref_alt:
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case dwarf::DW_FORM_GNU_strp_alt:
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case dwarf::DW_FORM_line_strp:
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case dwarf::DW_FORM_strp_sup:
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case dwarf::DW_FORM_ref_sup:
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// TODO: Handle DWARF32/64
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writeInteger((uint32_t)FormVal->Value, OS, DI.IsLittleEndian);
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break;
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case dwarf::DW_FORM_ref_sig8:
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writeInteger((uint64_t)FormVal->Value, OS, DI.IsLittleEndian);
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break;
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case dwarf::DW_FORM_GNU_addr_index:
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case dwarf::DW_FORM_GNU_str_index:
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encodeULEB128(FormVal->Value, OS);
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break;
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default:
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break;
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}
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} while (Indirect);
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}
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}
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}
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}
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void yaml2FileEntry(raw_ostream &OS, const DWARFYAML::File &File) {
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OS.write(File.Name.data(), File.Name.size());
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OS.write('\0');
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encodeULEB128(File.DirIdx, OS);
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encodeULEB128(File.ModTime, OS);
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encodeULEB128(File.Length, OS);
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}
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void yaml2debug_line(raw_ostream &OS, const DWARFYAML::Data &DI) {
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for (const auto LineTable : DI.DebugLines) {
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writeInteger((uint32_t)LineTable.TotalLength, OS, DI.IsLittleEndian);
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uint64_t SizeOfPrologueLength = 4;
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if (LineTable.TotalLength == UINT32_MAX) {
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writeInteger((uint64_t)LineTable.TotalLength64, OS, DI.IsLittleEndian);
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SizeOfPrologueLength = 8;
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}
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writeInteger((uint16_t)LineTable.Version, OS, DI.IsLittleEndian);
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writeVariableSizedInteger(LineTable.PrologueLength, SizeOfPrologueLength,
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OS, DI.IsLittleEndian);
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writeInteger((uint8_t)LineTable.MinInstLength, OS, DI.IsLittleEndian);
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if (LineTable.Version >= 4)
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writeInteger((uint8_t)LineTable.MaxOpsPerInst, OS, DI.IsLittleEndian);
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writeInteger((uint8_t)LineTable.DefaultIsStmt, OS, DI.IsLittleEndian);
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writeInteger((uint8_t)LineTable.LineBase, OS, DI.IsLittleEndian);
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writeInteger((uint8_t)LineTable.LineRange, OS, DI.IsLittleEndian);
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writeInteger((uint8_t)LineTable.OpcodeBase, OS, DI.IsLittleEndian);
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for (auto OpcodeLength : LineTable.StandardOpcodeLengths)
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writeInteger((uint8_t)OpcodeLength, OS, DI.IsLittleEndian);
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for (auto IncludeDir : LineTable.IncludeDirs) {
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OS.write(IncludeDir.data(), IncludeDir.size());
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OS.write('\0');
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}
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OS.write('\0');
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for (auto File : LineTable.Files)
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yaml2FileEntry(OS, File);
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OS.write('\0');
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for (auto Op : LineTable.Opcodes) {
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writeInteger((uint8_t)Op.Opcode, OS, DI.IsLittleEndian);
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if (Op.Opcode == 0) {
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encodeULEB128(Op.ExtLen, OS);
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writeInteger((uint8_t)Op.SubOpcode, OS, DI.IsLittleEndian);
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switch (Op.SubOpcode) {
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case dwarf::DW_LNE_set_address:
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case dwarf::DW_LNE_set_discriminator:
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writeVariableSizedInteger(Op.Data, DI.CompileUnits[0].AddrSize, OS,
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DI.IsLittleEndian);
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break;
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case dwarf::DW_LNE_define_file:
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yaml2FileEntry(OS, Op.FileEntry);
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break;
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case dwarf::DW_LNE_end_sequence:
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break;
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default:
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for (auto OpByte : Op.UnknownOpcodeData)
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writeInteger((uint8_t)OpByte, OS, DI.IsLittleEndian);
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}
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} else if (Op.Opcode < LineTable.OpcodeBase) {
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switch (Op.Opcode) {
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case dwarf::DW_LNS_copy:
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case dwarf::DW_LNS_negate_stmt:
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case dwarf::DW_LNS_set_basic_block:
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case dwarf::DW_LNS_const_add_pc:
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case dwarf::DW_LNS_set_prologue_end:
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case dwarf::DW_LNS_set_epilogue_begin:
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break;
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case dwarf::DW_LNS_advance_pc:
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case dwarf::DW_LNS_set_file:
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case dwarf::DW_LNS_set_column:
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case dwarf::DW_LNS_set_isa:
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encodeULEB128(Op.Data, OS);
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break;
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case dwarf::DW_LNS_advance_line:
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encodeSLEB128(Op.SData, OS);
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break;
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case dwarf::DW_LNS_fixed_advance_pc:
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writeInteger((uint16_t)Op.Data, OS, DI.IsLittleEndian);
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break;
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default:
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for (auto OpData : Op.StandardOpcodeData) {
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encodeULEB128(OpData, OS);
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}
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}
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}
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}
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}
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}
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