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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
122 lines
3.9 KiB
C++
122 lines
3.9 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/ADT/SmallVector.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/DIE.h"
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#include "llvm/IR/DebugInfoMetadata.h"
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#include "llvm/MC/MCStreamer.h"
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#include <algorithm>
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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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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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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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if (TheU->getCUNode()->isDebugDirectivesOnly())
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continue;
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TheU->setDebugSectionOffset(SecOffset);
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SecOffset += computeSizeAndOffsetsForUnit(TheU.get());
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}
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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 = sizeof(int32_t) + // 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, Abbrevs, 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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