mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-23 02:29:18 +00:00
The underlying bug has been fixed in r226736 so there's no need to workaround this anymore. This reverts commit r220923. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226842 91177308-0d34-0410-b5e6-96231b3b80d8
181 lines
5.7 KiB
C++
181 lines
5.7 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 "DwarfDebug.h"
|
|
#include "DwarfUnit.h"
|
|
#include "llvm/ADT/STLExtras.h"
|
|
#include "llvm/IR/DataLayout.h"
|
|
#include "llvm/MC/MCStreamer.h"
|
|
#include "llvm/Support/LEB128.h"
|
|
#include "llvm/Target/TargetLoweringObjectFile.h"
|
|
|
|
namespace llvm {
|
|
DwarfFile::DwarfFile(AsmPrinter *AP, DwarfDebug &DD, StringRef Pref,
|
|
BumpPtrAllocator &DA)
|
|
: Asm(AP), DD(DD), StrPool(DA, *Asm, Pref) {}
|
|
|
|
DwarfFile::~DwarfFile() {}
|
|
|
|
// Define a unique number for the abbreviation.
|
|
//
|
|
void DwarfFile::assignAbbrevNumber(DIEAbbrev &Abbrev) {
|
|
// Check the set for priors.
|
|
DIEAbbrev *InSet = AbbreviationsSet.GetOrInsertNode(&Abbrev);
|
|
|
|
// If it's newly added.
|
|
if (InSet == &Abbrev) {
|
|
// Add to abbreviation list.
|
|
Abbreviations.push_back(&Abbrev);
|
|
|
|
// Assign the vector position + 1 as its number.
|
|
Abbrev.setNumber(Abbreviations.size());
|
|
} else {
|
|
// Assign existing abbreviation number.
|
|
Abbrev.setNumber(InSet->getNumber());
|
|
}
|
|
}
|
|
|
|
void DwarfFile::addUnit(std::unique_ptr<DwarfUnit> U) {
|
|
CUs.push_back(std::move(U));
|
|
}
|
|
|
|
// Emit the various dwarf units to the unit section USection with
|
|
// the abbreviations going into ASection.
|
|
void DwarfFile::emitUnits(const MCSymbol *ASectionSym) {
|
|
for (const auto &TheU : CUs) {
|
|
DIE &Die = TheU->getUnitDie();
|
|
const MCSection *USection = TheU->getSection();
|
|
Asm->OutStreamer.SwitchSection(USection);
|
|
|
|
TheU->emitHeader(ASectionSym);
|
|
|
|
DD.emitDIE(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->setDebugInfoOffset(SecOffset);
|
|
|
|
// CU-relative offset is reset to 0 here.
|
|
unsigned Offset = sizeof(int32_t) + // Length of Unit Info
|
|
TheU->getHeaderSize(); // Unit-specific headers
|
|
|
|
// EndOffset here is CU-relative, after laying out
|
|
// all of the CU DIE.
|
|
unsigned EndOffset = computeSizeAndOffset(TheU->getUnitDie(), Offset);
|
|
SecOffset += EndOffset;
|
|
}
|
|
}
|
|
// 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) {
|
|
// Record the abbreviation.
|
|
assignAbbrevNumber(Die.getAbbrev());
|
|
|
|
// Get the abbreviation for this DIE.
|
|
const DIEAbbrev &Abbrev = Die.getAbbrev();
|
|
|
|
// Set DIE offset
|
|
Die.setOffset(Offset);
|
|
|
|
// Start the size with the size of abbreviation code.
|
|
Offset += getULEB128Size(Die.getAbbrevNumber());
|
|
|
|
const SmallVectorImpl<DIEValue *> &Values = Die.getValues();
|
|
const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
|
|
|
|
// Size the DIE attribute values.
|
|
for (unsigned i = 0, N = Values.size(); i < N; ++i)
|
|
// Size attribute value.
|
|
Offset += Values[i]->SizeOf(Asm, AbbrevData[i].getForm());
|
|
|
|
// Get the children.
|
|
const auto &Children = Die.getChildren();
|
|
|
|
// Size the DIE children if any.
|
|
if (!Children.empty()) {
|
|
assert(Abbrev.hasChildren() && "Children flag not set");
|
|
|
|
for (auto &Child : Children)
|
|
Offset = computeSizeAndOffset(*Child, Offset);
|
|
|
|
// End of children marker.
|
|
Offset += sizeof(int8_t);
|
|
}
|
|
|
|
Die.setSize(Offset - Die.getOffset());
|
|
return Offset;
|
|
}
|
|
void DwarfFile::emitAbbrevs(const MCSection *Section) {
|
|
// Check to see if it is worth the effort.
|
|
if (!Abbreviations.empty()) {
|
|
// Start the debug abbrev section.
|
|
Asm->OutStreamer.SwitchSection(Section);
|
|
|
|
// For each abbrevation.
|
|
for (const DIEAbbrev *Abbrev : Abbreviations) {
|
|
// Emit the abbrevations code (base 1 index.)
|
|
Asm->EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
|
|
|
|
// Emit the abbreviations data.
|
|
Abbrev->Emit(Asm);
|
|
}
|
|
|
|
// Mark end of abbreviations.
|
|
Asm->EmitULEB128(0, "EOM(3)");
|
|
}
|
|
}
|
|
|
|
// Emit strings into a string section.
|
|
void DwarfFile::emitStrings(const MCSection *StrSection,
|
|
const MCSection *OffsetSection) {
|
|
StrPool.emit(*Asm, StrSection, OffsetSection);
|
|
}
|
|
|
|
void DwarfFile::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
|
|
SmallVectorImpl<DbgVariable *> &Vars = ScopeVariables[LS];
|
|
DIVariable DV = Var->getVariable();
|
|
// Variables with positive arg numbers are parameters.
|
|
if (unsigned ArgNum = DV.getArgNumber()) {
|
|
// Keep all parameters in order at the start of the variable list to ensure
|
|
// function types are correct (no out-of-order parameters)
|
|
//
|
|
// This could be improved by only doing it for optimized builds (unoptimized
|
|
// builds have the right order to begin with), searching from the back (this
|
|
// would catch the unoptimized case quickly), or doing a binary search
|
|
// rather than linear search.
|
|
auto I = Vars.begin();
|
|
while (I != Vars.end()) {
|
|
unsigned CurNum = (*I)->getVariable().getArgNumber();
|
|
// A local (non-parameter) variable has been found, insert immediately
|
|
// before it.
|
|
if (CurNum == 0)
|
|
break;
|
|
// A later indexed parameter has been found, insert immediately before it.
|
|
if (CurNum > ArgNum)
|
|
break;
|
|
assert(CurNum != ArgNum && "Duplicate argument");
|
|
++I;
|
|
}
|
|
Vars.insert(I, Var);
|
|
return;
|
|
}
|
|
|
|
Vars.push_back(Var);
|
|
}
|
|
}
|