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MC/Mach-O: Factor out EmitInstTo{Fragment,Data} for emitting MCInst's as MCInstFragments or appending onto an MCDataFragment.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104735 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2010-05-26 20:37:00 +00:00
parent 23ff7cff52
commit 2ac0c453b2
1 changed files with 47 additions and 35 deletions
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82
lib/MC/MCMachOStreamer.cpp
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@ -60,6 +60,9 @@ private:
return DF;
}
void EmitInstToFragment(const MCInst &Inst);
void EmitInstToData(const MCInst &Inst);
public:
MCMachOStreamer(MCContext &Context, TargetAsmBackend &TAB,
raw_ostream &_OS, MCCodeEmitter *_Emitter)
@ -140,14 +143,14 @@ public:
unsigned MaxBytesToEmit = 0);
virtual void EmitValueToOffset(const MCExpr *Offset,
unsigned char Value = 0);
virtual void EmitFileDirective(StringRef Filename) {
report_fatal_error("unsupported directive: '.file'");
}
virtual void EmitDwarfFileDirective(unsigned FileNo, StringRef Filename) {
report_fatal_error("unsupported directive: '.file'");
}
virtual void EmitInstruction(const MCInst &Inst);
virtual void Finish();
@ -158,7 +161,7 @@ public:
void MCMachOStreamer::SwitchSection(const MCSection *Section) {
assert(Section && "Cannot switch to a null section!");
// If already in this section, then this is a noop.
if (Section == CurSection) return;
@ -200,7 +203,7 @@ void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
// FIXME: Cleanup this code, these bits should be emitted based on semantic
// properties, not on the order of definition, etc.
SD.setFlags(SD.getFlags() & ~SF_ReferenceTypeMask);
Symbol->setSection(*CurSection);
}
@ -308,7 +311,7 @@ void MCMachOStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
void MCMachOStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
// Encode the 'desc' value into the lowest implementation defined bits.
assert(DescValue == (DescValue & SF_DescFlagsMask) &&
assert(DescValue == (DescValue & SF_DescFlagsMask) &&
"Invalid .desc value!");
Assembler.getOrCreateSymbolData(*Symbol).setFlags(DescValue&SF_DescFlagsMask);
}
@ -417,6 +420,41 @@ void MCMachOStreamer::EmitValueToOffset(const MCExpr *Offset,
F->setAtom(CurrentAtomMap.lookup(CurSectionData));
}
void MCMachOStreamer::EmitInstToFragment(const MCInst &Inst) {
MCInstFragment *IF = new MCInstFragment(Inst, CurSectionData);
IF->setAtom(CurrentAtomMap.lookup(CurSectionData));
// Add the fixups and data.
//
// FIXME: Revisit this design decision when relaxation is done, we may be
// able to get away with not storing any extra data in the MCInst.
SmallVector<MCFixup, 4> Fixups;
SmallString<256> Code;
raw_svector_ostream VecOS(Code);
Assembler.getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
VecOS.flush();
IF->getCode() = Code;
IF->getFixups() = Fixups;
}
void MCMachOStreamer::EmitInstToData(const MCInst &Inst) {
MCDataFragment *DF = getOrCreateDataFragment();
SmallVector<MCFixup, 4> Fixups;
SmallString<256> Code;
raw_svector_ostream VecOS(Code);
Assembler.getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
VecOS.flush();
// Add the fixups and data.
for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
DF->addFixup(Fixups[i]);
}
DF->getContents().append(Code.begin(), Code.end());
}
void MCMachOStreamer::EmitInstruction(const MCInst &Inst) {
// Scan for values.
for (unsigned i = Inst.getNumOperands(); i--; )
@ -425,15 +463,6 @@ void MCMachOStreamer::EmitInstruction(const MCInst &Inst) {
CurSectionData->setHasInstructions(true);
// FIXME-PERF: Common case is that we don't need to relax, encode directly
// onto the data fragments buffers.
SmallVector<MCFixup, 4> Fixups;
SmallString<256> Code;
raw_svector_ostream VecOS(Code);
Assembler.getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
VecOS.flush();
// See if we might need to relax this instruction, if so it needs its own
// fragment.
//
@ -447,27 +476,10 @@ void MCMachOStreamer::EmitInstruction(const MCInst &Inst) {
// total knowledge about undefined symbols at that point). Even now, though,
// we can do a decent job, especially on Darwin where scattering means that we
// are going to often know that we can never fully resolve a fixup.
if (Assembler.getBackend().MayNeedRelaxation(Inst)) {
MCInstFragment *IF = new MCInstFragment(Inst, CurSectionData);
IF->setAtom(CurrentAtomMap.lookup(CurSectionData));
// Add the fixups and data.
//
// FIXME: Revisit this design decision when relaxation is done, we may be
// able to get away with not storing any extra data in the MCInst.
IF->getCode() = Code;
IF->getFixups() = Fixups;
return;
}
// Add the fixups and data.
MCDataFragment *DF = getOrCreateDataFragment();
for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
DF->addFixup(Fixups[i]);
}
DF->getContents().append(Code.begin(), Code.end());
if (Assembler.getBackend().MayNeedRelaxation(Inst))
EmitInstToFragment(Inst);
else
EmitInstToData(Inst);
}
void MCMachOStreamer::Finish() {