2014-04-24 02:54:00 +08:00
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//===-- llvm/CodeGen/DwarfFile.cpp - Dwarf Debug Framework ----------------===//
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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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#include "DwarfFile.h"
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#include "DwarfDebug.h"
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#include "DwarfUnit.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Support/LEB128.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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namespace llvm {
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2014-10-23 08:16:03 +08:00
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DwarfFile::DwarfFile(AsmPrinter *AP, DwarfDebug &DD, StringRef Pref,
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BumpPtrAllocator &DA)
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: Asm(AP), DD(DD), StrPool(DA, *Asm, Pref) {
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(void)this->DD;
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}
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2014-04-24 02:54:00 +08:00
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2014-04-24 03:44:08 +08:00
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DwarfFile::~DwarfFile() {}
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2014-04-24 02:54:00 +08:00
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// Define a unique number for the abbreviation.
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//
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void DwarfFile::assignAbbrevNumber(DIEAbbrev &Abbrev) {
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// Check the set for priors.
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DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev);
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// If it's newly added.
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if (InSet == &Abbrev) {
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// Add to abbreviation list.
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Abbreviations.push_back(&Abbrev);
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// Assign the vector position + 1 as its number.
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Abbrev.setNumber(Abbreviations.size());
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} else {
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// Assign existing abbreviation number.
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Abbrev.setNumber(InSet->getNumber());
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}
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}
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void DwarfFile::addUnit(std::unique_ptr<DwarfUnit> U) {
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CUs.push_back(std::move(U));
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}
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// Emit the various dwarf units to the unit section USection with
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// the abbreviations going into ASection.
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void DwarfFile::emitUnits(const MCSymbol *ASectionSym) {
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for (const auto &TheU : CUs) {
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DIE &Die = TheU->getUnitDie();
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const MCSection *USection = TheU->getSection();
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Asm->OutStreamer.SwitchSection(USection);
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// Emit the compile units header.
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Asm->OutStreamer.EmitLabel(TheU->getLabelBegin());
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// Emit size of content not including length itself
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Asm->OutStreamer.AddComment("Length of Unit");
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Asm->EmitInt32(TheU->getHeaderSize() + Die.getSize());
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TheU->emitHeader(ASectionSym);
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DD.emitDIE(Die);
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Asm->OutStreamer.EmitLabel(TheU->getLabelEnd());
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}
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}
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2014-10-23 08:16:05 +08:00
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2014-04-24 02:54:00 +08:00
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// Compute the size and offset for each DIE.
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void DwarfFile::computeSizeAndOffsets() {
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// Offset from the first CU in the debug info section is 0 initially.
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unsigned SecOffset = 0;
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// Iterate over each compile unit and set the size and offsets for each
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// DIE within each compile unit. All offsets are CU relative.
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for (const auto &TheU : CUs) {
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TheU->setDebugInfoOffset(SecOffset);
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// CU-relative offset is reset to 0 here.
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unsigned Offset = sizeof(int32_t) + // Length of Unit Info
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TheU->getHeaderSize(); // Unit-specific headers
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// EndOffset here is CU-relative, after laying out
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// all of the CU DIE.
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unsigned EndOffset = computeSizeAndOffset(TheU->getUnitDie(), Offset);
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SecOffset += EndOffset;
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}
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}
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// Compute the size and offset of a DIE. The offset is relative to start of the
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// CU. It returns the offset after laying out the DIE.
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unsigned DwarfFile::computeSizeAndOffset(DIE &Die, unsigned Offset) {
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// Record the abbreviation.
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assignAbbrevNumber(Die.getAbbrev());
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// Get the abbreviation for this DIE.
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const DIEAbbrev &Abbrev = Die.getAbbrev();
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// Set DIE offset
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Die.setOffset(Offset);
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// Start the size with the size of abbreviation code.
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Offset += getULEB128Size(Die.getAbbrevNumber());
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const SmallVectorImpl<DIEValue *> &Values = Die.getValues();
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const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
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// Size the DIE attribute values.
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for (unsigned i = 0, N = Values.size(); i < N; ++i)
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// Size attribute value.
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Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
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// Get the children.
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const auto &Children = Die.getChildren();
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// Size the DIE children if any.
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if (!Children.empty()) {
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assert(Abbrev.hasChildren() && "Children flag not set");
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for (auto &Child : Children)
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Offset = computeSizeAndOffset(*Child, Offset);
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// End of children marker.
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Offset += sizeof(int8_t);
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}
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Die.setSize(Offset - Die.getOffset());
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return Offset;
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}
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void DwarfFile::emitAbbrevs(const MCSection *Section) {
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// Check to see if it is worth the effort.
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if (!Abbreviations.empty()) {
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// Start the debug abbrev section.
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Asm->OutStreamer.SwitchSection(Section);
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// For each abbrevation.
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for (const DIEAbbrev *Abbrev : Abbreviations) {
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// Emit the abbrevations code (base 1 index.)
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Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
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// Emit the abbreviations data.
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Abbrev->Emit(Asm);
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}
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// Mark end of abbreviations.
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Asm->EmitULEB128(0, "EOM(3)");
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}
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}
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// Emit strings into a string section.
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void DwarfFile::emitStrings(const MCSection *StrSection,
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const MCSection *OffsetSection) {
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StrPool.emit(*Asm, StrSection, OffsetSection);
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}
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// If Var is a current function argument then add it to CurrentFnArguments list.
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bool DwarfFile::addCurrentFnArgument(DbgVariable *Var, LexicalScope *Scope) {
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if (Scope->getParent())
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return false;
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DIVariable DV = Var->getVariable();
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if (DV.getTag() != dwarf::DW_TAG_arg_variable)
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return false;
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unsigned ArgNo = DV.getArgNumber();
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if (ArgNo == 0)
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return false;
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auto &CurrentFnArguments = DD.getCurrentFnArguments();
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// llvm::Function argument size is not good indicator of how many
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// arguments does the function have at source level.
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if (ArgNo > CurrentFnArguments.size())
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CurrentFnArguments.resize(ArgNo * 2);
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assert(!CurrentFnArguments[ArgNo - 1]);
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CurrentFnArguments[ArgNo - 1] = Var;
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return true;
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}
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2014-04-24 02:54:00 +08:00
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}
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