133 lines
4.5 KiB
C++
133 lines
4.5 KiB
C++
//===- llvm/CodeGen/DwarfFile.cpp - Dwarf Debug Framework -----------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "DwarfFile.h"
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#include "DwarfCompileUnit.h"
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#include "DwarfDebug.h"
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#include "DwarfUnit.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/IR/DebugInfoMetadata.h"
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#include "llvm/MC/MCStreamer.h"
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#include <cstdint>
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using namespace llvm;
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DwarfFile::DwarfFile(AsmPrinter *AP, StringRef Pref, BumpPtrAllocator &DA)
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: Asm(AP), Abbrevs(AbbrevAllocator), StrPool(DA, *Asm, Pref) {}
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void DwarfFile::addUnit(std::unique_ptr<DwarfCompileUnit> 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(bool UseOffsets) {
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for (const auto &TheU : CUs)
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emitUnit(TheU.get(), UseOffsets);
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}
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void DwarfFile::emitUnit(DwarfUnit *TheU, bool UseOffsets) {
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if (TheU->getCUNode()->isDebugDirectivesOnly())
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return;
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MCSection *S = TheU->getSection();
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if (!S)
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return;
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// Skip CUs that ended up not being needed (split CUs that were abandoned
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// because they added no information beyond the non-split CU)
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if (llvm::empty(TheU->getUnitDie().values()))
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return;
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Asm->OutStreamer->switchSection(S);
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TheU->emitHeader(UseOffsets);
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Asm->emitDwarfDIE(TheU->getUnitDie());
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if (MCSymbol *EndLabel = TheU->getEndLabel())
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Asm->OutStreamer->emitLabel(EndLabel);
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}
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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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uint64_t 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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if (TheU->getCUNode()->isDebugDirectivesOnly())
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continue;
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// Skip CUs that ended up not being needed (split CUs that were abandoned
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// because they added no information beyond the non-split CU)
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if (llvm::empty(TheU->getUnitDie().values()))
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return;
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TheU->setDebugSectionOffset(SecOffset);
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SecOffset += computeSizeAndOffsetsForUnit(TheU.get());
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}
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if (SecOffset > UINT32_MAX && !Asm->isDwarf64())
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report_fatal_error("The generated debug information is too large "
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"for the 32-bit DWARF format.");
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}
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unsigned DwarfFile::computeSizeAndOffsetsForUnit(DwarfUnit *TheU) {
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// CU-relative offset is reset to 0 here.
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unsigned Offset = Asm->getUnitLengthFieldByteSize() + // Length of Unit Info
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TheU->getHeaderSize(); // Unit-specific headers
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// The return value here is CU-relative, after laying out
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// all of the CU DIE.
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return computeSizeAndOffset(TheU->getUnitDie(), Offset);
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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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return Die.computeOffsetsAndAbbrevs(Asm->getDwarfFormParams(), Abbrevs,
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Offset);
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}
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void DwarfFile::emitAbbrevs(MCSection *Section) { Abbrevs.Emit(Asm, Section); }
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// Emit strings into a string section.
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void DwarfFile::emitStrings(MCSection *StrSection, MCSection *OffsetSection,
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bool UseRelativeOffsets) {
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StrPool.emit(*Asm, StrSection, OffsetSection, UseRelativeOffsets);
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}
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bool DwarfFile::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
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auto &ScopeVars = ScopeVariables[LS];
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const DILocalVariable *DV = Var->getVariable();
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if (unsigned ArgNum = DV->getArg()) {
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auto Cached = ScopeVars.Args.find(ArgNum);
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if (Cached == ScopeVars.Args.end())
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ScopeVars.Args[ArgNum] = Var;
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else {
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Cached->second->addMMIEntry(*Var);
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return false;
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}
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} else {
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ScopeVars.Locals.push_back(Var);
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}
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return true;
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}
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void DwarfFile::addScopeLabel(LexicalScope *LS, DbgLabel *Label) {
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SmallVectorImpl<DbgLabel *> &Labels = ScopeLabels[LS];
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Labels.push_back(Label);
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}
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std::pair<uint32_t, RangeSpanList *>
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DwarfFile::addRange(const DwarfCompileUnit &CU, SmallVector<RangeSpan, 2> R) {
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CURangeLists.push_back(
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RangeSpanList{Asm->createTempSymbol("debug_ranges"), &CU, std::move(R)});
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return std::make_pair(CURangeLists.size() - 1, &CURangeLists.back());
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}
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