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MC/Mach-O: Explicitly track atoms, as represented by their defining symbol, for each fragment (not yet used).

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103438 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar
2010-05-10 22:45:09 +00:00
parent e9e2ba05de
commit 071f73db4a
3 changed files with 46 additions and 13 deletions
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lib/MC/MCMachOStreamer.cpp
+36 -8
View File
@@ -31,6 +31,9 @@ private:
MCAssembler Assembler;
MCSectionData *CurSectionData;
/// Track the current atom for each section.
DenseMap<const MCSectionData*, MCSymbolData*> CurrentAtomMap;
private:
MCFragment *getCurrentFragment() const {
assert(CurSectionData && "No current section!");
@@ -46,10 +49,17 @@ private:
MCDataFragment *getOrCreateDataFragment() const {
MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
if (!F)
F = new MCDataFragment(CurSectionData);
F = createDataFragment();
return F;
}
/// Create a new data fragment in the current section.
MCDataFragment *createDataFragment() const {
MCDataFragment *DF = new MCDataFragment(CurSectionData);
DF->setAtom(CurrentAtomMap.lookup(CurSectionData));
return DF;
}
public:
MCMachOStreamer(MCContext &Context, TargetAsmBackend &TAB,
raw_ostream &_OS, MCCodeEmitter *_Emitter)
@@ -159,12 +169,23 @@ void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
assert(CurSection && "Cannot emit before setting section!");
MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
// Update the current atom map, if necessary.
bool MustCreateFragment = false;
if (Assembler.isSymbolLinkerVisible(&SD)) {
CurrentAtomMap[CurSectionData] = &SD;
// We have to create a new fragment, fragments cannot span atoms.
MustCreateFragment = true;
}
// FIXME: This is wasteful, we don't necessarily need to create a data
// fragment. Instead, we should mark the symbol as pointing into the data
// fragment if it exists, otherwise we should just queue the label and set its
// fragment pointer when we emit the next fragment.
MCDataFragment *F = getOrCreateDataFragment();
MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
MCDataFragment *F =
MustCreateFragment ? createDataFragment() : getOrCreateDataFragment();
assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
SD.setFragment(F);
SD.setOffset(F->getContents().size());
@@ -302,6 +323,8 @@ void MCMachOStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
MCFragment *F = new MCZeroFillFragment(Size, ByteAlignment, &SectData);
SD.setFragment(F);
if (Assembler.isSymbolLinkerVisible(&SD))
F->setAtom(&SD);
Symbol->setSection(*Section);
@@ -336,8 +359,10 @@ void MCMachOStreamer::EmitValueToAlignment(unsigned ByteAlignment,
unsigned MaxBytesToEmit) {
if (MaxBytesToEmit == 0)
MaxBytesToEmit = ByteAlignment;
new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit,
false /* EmitNops */, CurSectionData);
MCFragment *F = new MCAlignFragment(ByteAlignment, Value, ValueSize,
MaxBytesToEmit, /*EmitNops=*/false,
CurSectionData);
F->setAtom(CurrentAtomMap.lookup(CurSectionData));
// Update the maximum alignment on the current section if necessary.
if (ByteAlignment > CurSectionData->getAlignment())
@@ -348,8 +373,9 @@ void MCMachOStreamer::EmitCodeAlignment(unsigned ByteAlignment,
unsigned MaxBytesToEmit) {
if (MaxBytesToEmit == 0)
MaxBytesToEmit = ByteAlignment;
new MCAlignFragment(ByteAlignment, 0, 1, MaxBytesToEmit,
true /* EmitNops */, CurSectionData);
MCFragment *F = new MCAlignFragment(ByteAlignment, 0, 1, MaxBytesToEmit,
/*EmitNops=*/true, CurSectionData);
F->setAtom(CurrentAtomMap.lookup(CurSectionData));
// Update the maximum alignment on the current section if necessary.
if (ByteAlignment > CurSectionData->getAlignment())
@@ -358,7 +384,8 @@ void MCMachOStreamer::EmitCodeAlignment(unsigned ByteAlignment,
void MCMachOStreamer::EmitValueToOffset(const MCExpr *Offset,
unsigned char Value) {
new MCOrgFragment(*Offset, Value, CurSectionData);
MCFragment *F = new MCOrgFragment(*Offset, Value, CurSectionData);
F->setAtom(CurrentAtomMap.lookup(CurSectionData));
}
void MCMachOStreamer::EmitInstruction(const MCInst &Inst) {
@@ -401,6 +428,7 @@ void MCMachOStreamer::EmitInstruction(const MCInst &Inst) {
// are going to often know that we can never fully resolve a fixup.
if (Assembler.getBackend().MayNeedRelaxation(Inst, AsmFixups)) {
MCInstFragment *IF = new MCInstFragment(Inst, CurSectionData);
IF->setAtom(CurrentAtomMap.lookup(CurSectionData));
// Add the fixups and data.
//