forked from OSchip/llvm-project
121 lines
4.0 KiB
C++
121 lines
4.0 KiB
C++
//===- llvm/CodeGen/DwarfFile.cpp - Dwarf Debug Framework -----------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "DwarfFile.h"
|
|
#include "DwarfCompileUnit.h"
|
|
#include "DwarfDebug.h"
|
|
#include "DwarfUnit.h"
|
|
#include "llvm/ADT/SmallVector.h"
|
|
#include "llvm/CodeGen/AsmPrinter.h"
|
|
#include "llvm/CodeGen/DIE.h"
|
|
#include "llvm/IR/DebugInfoMetadata.h"
|
|
#include "llvm/MC/MCStreamer.h"
|
|
#include <algorithm>
|
|
#include <cstdint>
|
|
|
|
using namespace llvm;
|
|
|
|
DwarfFile::DwarfFile(AsmPrinter *AP, StringRef Pref, BumpPtrAllocator &DA)
|
|
: Asm(AP), Abbrevs(AbbrevAllocator), StrPool(DA, *Asm, Pref) {}
|
|
|
|
void DwarfFile::addUnit(std::unique_ptr<DwarfCompileUnit> U) {
|
|
CUs.push_back(std::move(U));
|
|
}
|
|
|
|
void DwarfFile::emitStringOffsetsTableHeader(MCSection *Section) {
|
|
if (StrPool.empty())
|
|
return;
|
|
Asm->OutStreamer->SwitchSection(Section);
|
|
unsigned EntrySize = 4;
|
|
// FIXME: DWARF64
|
|
// We are emitting the header for a contribution to the string offsets
|
|
// table. The header consists of an entry with the contribution's
|
|
// size (not including the size of the length field), the DWARF version and
|
|
// 2 bytes of padding.
|
|
Asm->emitInt32(StrPool.size() * EntrySize + 4);
|
|
Asm->emitInt16(Asm->getDwarfVersion());
|
|
Asm->emitInt16(0);
|
|
// Define the symbol that marks the start of the contribution. It is
|
|
// referenced by most unit headers via DW_AT_str_offsets_base.
|
|
// Split units do not use the attribute.
|
|
if (StringOffsetsStartSym)
|
|
Asm->OutStreamer->EmitLabel(StringOffsetsStartSym);
|
|
}
|
|
|
|
// Emit the various dwarf units to the unit section USection with
|
|
// the abbreviations going into ASection.
|
|
void DwarfFile::emitUnits(bool UseOffsets) {
|
|
for (const auto &TheU : CUs)
|
|
emitUnit(TheU.get(), UseOffsets);
|
|
}
|
|
|
|
void DwarfFile::emitUnit(DwarfUnit *TheU, bool UseOffsets) {
|
|
DIE &Die = TheU->getUnitDie();
|
|
MCSection *USection = TheU->getSection();
|
|
Asm->OutStreamer->SwitchSection(USection);
|
|
|
|
TheU->emitHeader(UseOffsets);
|
|
|
|
Asm->emitDwarfDIE(Die);
|
|
}
|
|
|
|
// Compute the size and offset for each DIE.
|
|
void DwarfFile::computeSizeAndOffsets() {
|
|
// 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 (const auto &TheU : CUs) {
|
|
TheU->setDebugSectionOffset(SecOffset);
|
|
SecOffset += computeSizeAndOffsetsForUnit(TheU.get());
|
|
}
|
|
}
|
|
|
|
unsigned DwarfFile::computeSizeAndOffsetsForUnit(DwarfUnit *TheU) {
|
|
// CU-relative offset is reset to 0 here.
|
|
unsigned Offset = sizeof(int32_t) + // Length of Unit Info
|
|
TheU->getHeaderSize(); // Unit-specific headers
|
|
|
|
// The return value here is CU-relative, after laying out
|
|
// all of the CU DIE.
|
|
return computeSizeAndOffset(TheU->getUnitDie(), Offset);
|
|
}
|
|
|
|
// Compute the size and offset of a DIE. The offset is relative to start of the
|
|
// CU. It returns the offset after laying out the DIE.
|
|
unsigned DwarfFile::computeSizeAndOffset(DIE &Die, unsigned Offset) {
|
|
return Die.computeOffsetsAndAbbrevs(Asm, Abbrevs, Offset);
|
|
}
|
|
|
|
void DwarfFile::emitAbbrevs(MCSection *Section) { Abbrevs.Emit(Asm, Section); }
|
|
|
|
// Emit strings into a string section.
|
|
void DwarfFile::emitStrings(MCSection *StrSection, MCSection *OffsetSection,
|
|
bool UseRelativeOffsets) {
|
|
StrPool.emit(*Asm, StrSection, OffsetSection, UseRelativeOffsets);
|
|
}
|
|
|
|
bool DwarfFile::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
|
|
auto &ScopeVars = ScopeVariables[LS];
|
|
const DILocalVariable *DV = Var->getVariable();
|
|
if (unsigned ArgNum = DV->getArg()) {
|
|
auto Cached = ScopeVars.Args.find(ArgNum);
|
|
if (Cached == ScopeVars.Args.end())
|
|
ScopeVars.Args[ArgNum] = Var;
|
|
else {
|
|
Cached->second->addMMIEntry(*Var);
|
|
return false;
|
|
}
|
|
} else {
|
|
ScopeVars.Locals.push_back(Var);
|
|
}
|
|
return true;
|
|
}
|