mirror of
https://github.com/RPCS3/llvm-mirror.git
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9caba155e1
llvm-svn: 311124
119 lines
3.9 KiB
C++
119 lines
3.9 KiB
C++
//===- 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 "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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DIE &Die = TheU->getUnitDie();
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MCSection *USection = TheU->getSection();
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Asm->OutStreamer->SwitchSection(USection);
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TheU->emitHeader(UseOffsets);
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Asm->emitDwarfDIE(Die);
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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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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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StrPool.emit(*Asm, StrSection, OffsetSection);
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}
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bool DwarfFile::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
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SmallVectorImpl<DbgVariable *> &Vars = ScopeVariables[LS];
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const DILocalVariable *DV = Var->getVariable();
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// Variables with positive arg numbers are parameters.
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if (unsigned ArgNum = DV->getArg()) {
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// Keep all parameters in order at the start of the variable list to ensure
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// function types are correct (no out-of-order parameters)
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//
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// This could be improved by only doing it for optimized builds (unoptimized
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// builds have the right order to begin with), searching from the back (this
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// would catch the unoptimized case quickly), or doing a binary search
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// rather than linear search.
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auto I = Vars.begin();
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while (I != Vars.end()) {
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unsigned CurNum = (*I)->getVariable()->getArg();
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// A local (non-parameter) variable has been found, insert immediately
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// before it.
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if (CurNum == 0)
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break;
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// A later indexed parameter has been found, insert immediately before it.
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if (CurNum > ArgNum)
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break;
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if (CurNum == ArgNum) {
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(*I)->addMMIEntry(*Var);
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return false;
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}
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++I;
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}
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Vars.insert(I, Var);
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return true;
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}
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Vars.push_back(Var);
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return true;
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}
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