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-rw-r--r--llvm/lib/CodeGen/DwarfGenerator.cpp262
1 files changed, 262 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/DwarfGenerator.cpp b/llvm/lib/CodeGen/DwarfGenerator.cpp
new file mode 100644
index 00000000000..1e8e6614921
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+++ b/llvm/lib/CodeGen/DwarfGenerator.cpp
@@ -0,0 +1,262 @@
+//===--- lib/CodeGen/DwarfGenerator.cpp -------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DwarfGenerator.h"
+#include "AsmPrinter/DwarfStringPool.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/DIE.h"
+#include "llvm/DebugInfo/DWARF/DWARFContext.h"
+#include "llvm/DebugInfo/DWARF/DWARFDebugInfoEntry.h"
+#include "llvm/DebugInfo/DWARF/DWARFDebugLine.h"
+#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
+#include "llvm/IR/LegacyPassManagers.h"
+#include "llvm/MC/MCAsmBackend.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCDwarf.h"
+#include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/MC/MCTargetOptionsCommandFlags.h"
+#include "llvm/PassAnalysisSupport.h"
+#include "llvm/Support/Dwarf.h"
+#include "llvm/Support/LEB128.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
+
+using namespace llvm;
+using namespace dwarf;
+
+namespace {} // end anonymous namespace
+
+//===----------------------------------------------------------------------===//
+/// dwarfgen::DIE implementation.
+//===----------------------------------------------------------------------===//
+unsigned dwarfgen::DIE::computeSizeAndOffsets(unsigned Offset) {
+ auto &DG = CU->getGenerator();
+ return Die->computeOffsetsAndAbbrevs(DG.getAsmPrinter(), DG.getAbbrevSet(),
+ Offset);
+}
+
+void dwarfgen::DIE::addAttribute(uint16_t A, dwarf::Form Form, uint64_t U) {
+ auto &DG = CU->getGenerator();
+ Die->addValue(DG.getAllocator(), static_cast<dwarf::Attribute>(A), Form,
+ DIEInteger(U));
+}
+
+void dwarfgen::DIE::addAttribute(uint16_t A, dwarf::Form Form,
+ StringRef String) {
+ auto &DG = CU->getGenerator();
+ if (Form == DW_FORM_string) {
+ Die->addValue(DG.getAllocator(), static_cast<dwarf::Attribute>(A), Form,
+ new (DG.getAllocator()) DIEInlineString(String));
+ } else {
+ Die->addValue(
+ DG.getAllocator(), static_cast<dwarf::Attribute>(A), Form,
+ DIEString(DG.getStringPool().getEntry(*DG.getAsmPrinter(), String)));
+ }
+}
+
+void dwarfgen::DIE::addAttribute(uint16_t A, dwarf::Form Form,
+ dwarfgen::DIE &RefDie) {
+ auto &DG = CU->getGenerator();
+ Die->addValue(DG.getAllocator(), static_cast<dwarf::Attribute>(A), Form,
+ DIEEntry(*RefDie.Die));
+}
+
+void dwarfgen::DIE::addAttribute(uint16_t A, dwarf::Form Form, const void *P,
+ size_t S) {
+ auto &DG = CU->getGenerator();
+ DIEBlock *Block = new (DG.getAllocator()) DIEBlock;
+ for (size_t I = 0; I < S; ++I)
+ Block->addValue(DG.getAllocator(), (dwarf::Attribute)0,
+ dwarf::DW_FORM_data1, DIEInteger(((uint8_t *)P)[I]));
+
+ Block->ComputeSize(DG.getAsmPrinter());
+ Die->addValue(DG.getAllocator(), static_cast<dwarf::Attribute>(A), Form,
+ Block);
+}
+
+void dwarfgen::DIE::addAttribute(uint16_t A, dwarf::Form Form) {
+ auto &DG = CU->getGenerator();
+ assert(Form == DW_FORM_flag_present);
+ Die->addValue(DG.getAllocator(), static_cast<dwarf::Attribute>(A), Form,
+ DIEInteger(1));
+}
+
+dwarfgen::DIE dwarfgen::DIE::addChild(dwarf::Tag Tag) {
+ auto &DG = CU->getGenerator();
+ return dwarfgen::DIE(CU,
+ &Die->addChild(llvm::DIE::get(DG.getAllocator(), Tag)));
+}
+
+dwarfgen::DIE dwarfgen::CompileUnit::getUnitDIE() {
+ return dwarfgen::DIE(this, &DU.getUnitDie());
+}
+
+//===----------------------------------------------------------------------===//
+/// dwarfgen::Generator implementation.
+//===----------------------------------------------------------------------===//
+
+dwarfgen::Generator::Generator() : Abbreviations(Allocator) {}
+dwarfgen::Generator::~Generator() = default;
+
+llvm::Expected<std::unique_ptr<dwarfgen::Generator>>
+dwarfgen::Generator::create(Triple TheTriple, uint16_t DwarfVersion) {
+ std::unique_ptr<dwarfgen::Generator> GenUP(new dwarfgen::Generator());
+ llvm::Error error = GenUP->init(TheTriple, DwarfVersion);
+ if (error)
+ return Expected<std::unique_ptr<dwarfgen::Generator>>(std::move(error));
+ return Expected<std::unique_ptr<dwarfgen::Generator>>(std::move(GenUP));
+}
+
+llvm::Error dwarfgen::Generator::init(Triple TheTriple, uint16_t V) {
+ Version = V;
+ std::string ErrorStr;
+ std::string TripleName;
+
+ // Get the target.
+ const Target *TheTarget =
+ TargetRegistry::lookupTarget(TripleName, TheTriple, ErrorStr);
+ if (!TheTarget)
+ return make_error<StringError>(ErrorStr, inconvertibleErrorCode());
+
+ TripleName = TheTriple.getTriple();
+
+ // Create all the MC Objects.
+ MRI.reset(TheTarget->createMCRegInfo(TripleName));
+ if (!MRI)
+ return make_error<StringError>(Twine("no register info for target ") +
+ TripleName,
+ inconvertibleErrorCode());
+
+ MAI.reset(TheTarget->createMCAsmInfo(*MRI, TripleName));
+ if (!MAI)
+ return make_error<StringError>("no asm info for target " + TripleName,
+ inconvertibleErrorCode());
+
+ MOFI.reset(new MCObjectFileInfo);
+ MC.reset(new MCContext(MAI.get(), MRI.get(), MOFI.get()));
+ MOFI->InitMCObjectFileInfo(TheTriple, /*PIC*/ false, CodeModel::Default, *MC);
+
+ MCTargetOptions Options;
+ MAB = TheTarget->createMCAsmBackend(*MRI, TripleName, "", Options);
+ if (!MAB)
+ return make_error<StringError>("no asm backend for target " + TripleName,
+ inconvertibleErrorCode());
+
+ MII.reset(TheTarget->createMCInstrInfo());
+ if (!MII)
+ return make_error<StringError>("no instr info info for target " +
+ TripleName,
+ inconvertibleErrorCode());
+
+ MSTI.reset(TheTarget->createMCSubtargetInfo(TripleName, "", ""));
+ if (!MSTI)
+ return make_error<StringError>("no subtarget info for target " + TripleName,
+ inconvertibleErrorCode());
+
+ MCE = TheTarget->createMCCodeEmitter(*MII, *MRI, *MC);
+ if (!MCE)
+ return make_error<StringError>("no code emitter for target " + TripleName,
+ inconvertibleErrorCode());
+
+ Stream = make_unique<raw_svector_ostream>(FileBytes);
+
+ MCTargetOptions MCOptions = InitMCTargetOptionsFromFlags();
+ MS = TheTarget->createMCObjectStreamer(
+ TheTriple, *MC, *MAB, *Stream, MCE, *MSTI, MCOptions.MCRelaxAll,
+ MCOptions.MCIncrementalLinkerCompatible,
+ /*DWARFMustBeAtTheEnd*/ false);
+ if (!MS)
+ return make_error<StringError>("no object streamer for target " +
+ TripleName,
+ inconvertibleErrorCode());
+
+ // Finally create the AsmPrinter we'll use to emit the DIEs.
+ TM.reset(TheTarget->createTargetMachine(TripleName, "", "", TargetOptions(),
+ None));
+ if (!TM)
+ return make_error<StringError>("no target machine for target " + TripleName,
+ inconvertibleErrorCode());
+
+ Asm.reset(TheTarget->createAsmPrinter(*TM, std::unique_ptr<MCStreamer>(MS)));
+ if (!Asm)
+ return make_error<StringError>("no asm printer for target " + TripleName,
+ inconvertibleErrorCode());
+
+ // Set the DWARF version correctly on all classes that we use.
+ MC->setDwarfVersion(Version);
+ Asm->setDwarfVersion(Version);
+
+ StringPool.reset(new DwarfStringPool(Allocator, *Asm, StringRef()));
+
+ return Error::success();
+}
+
+StringRef dwarfgen::Generator::generate() {
+ // Offset from the first CU in the debug info section is 0 initially.
+ unsigned SecOffset = 0;
+
+ // Iterate over each compile unit and set the size and offsets for each
+ // DIE within each compile unit. All offsets are CU relative.
+ for (auto &CU : CompileUnits) {
+ // Set the absolute .debug_info offset for this compile unit.
+ CU->setOffset(SecOffset);
+ // The DIEs contain compile unit relative offsets.
+ unsigned CUOffset = 11;
+ CUOffset = CU->getUnitDIE().computeSizeAndOffsets(CUOffset);
+ // Update our absolute .debug_info offset.
+ SecOffset += CUOffset;
+ CU->setLength(CUOffset - 4);
+ }
+ Abbreviations.Emit(Asm.get(), MOFI->getDwarfAbbrevSection());
+ StringPool->emit(*Asm, MOFI->getDwarfStrSection());
+ MS->SwitchSection(MOFI->getDwarfInfoSection());
+ for (auto &CU : CompileUnits) {
+ uint16_t Version = CU->getVersion();
+ auto Length = CU->getLength();
+ MC->setDwarfVersion(Version);
+ assert(Length != -1U);
+ Asm->EmitInt32(Length);
+ Asm->EmitInt16(Version);
+ Asm->EmitInt32(0);
+ Asm->EmitInt8(CU->getAddressSize());
+ Asm->emitDwarfDIE(*CU->getUnitDIE().Die);
+ }
+
+ MS->Finish();
+ if (FileBytes.empty())
+ return StringRef();
+ return StringRef(FileBytes.data(), FileBytes.size());
+}
+
+bool dwarfgen::Generator::saveFile(StringRef Path) {
+ if (FileBytes.empty())
+ return false;
+ std::error_code EC;
+ raw_fd_ostream Strm(Path, EC, sys::fs::F_None);
+ if (EC)
+ return false;
+ Strm.write(FileBytes.data(), FileBytes.size());
+ Strm.close();
+ return true;
+}
+
+dwarfgen::CompileUnit &dwarfgen::Generator::addCompileUnit() {
+ CompileUnits.push_back(std::unique_ptr<CompileUnit>(
+ new CompileUnit(*this, Version, Asm->getPointerSize())));
+ return *CompileUnits.back();
+}
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