Differential D72225 Diff 236526 llvm/lib/MC/MCObjectStreamer.cpp

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llvm/lib/MC/MCObjectStreamer.cpp

Show First 20 Lines • Show All 182 Lines • ▼ Show 20 Lines	MCFragment *MCObjectStreamer::getCurrentFragment() const {
assert(getCurrentSectionOnly() && "No current section!");		assert(getCurrentSectionOnly() && "No current section!");

if (CurInsertionPoint != getCurrentSectionOnly()->getFragmentList().begin())		if (CurInsertionPoint != getCurrentSectionOnly()->getFragmentList().begin())
return &*std::prev(CurInsertionPoint);		return &*std::prev(CurInsertionPoint);

return nullptr;		return nullptr;
}		}

static bool CanReuseDataFragment(const MCDataFragment &F,		static bool CanReuseDataFragment(const MCDataFragment &F, MCObjectStreamer &OS,
const MCAssembler &Assembler,
const MCSubtargetInfo *STI) {		const MCSubtargetInfo *STI) {
if (!F.hasInstructions())		if (!F.hasInstructions())
return true;		return true;

		MCAssembler &Assembler = OS.getAssembler();

		// When the target need align instructions, we need to determine the size
		// of some instructions during the relaxation, the easiest way to do it is
		// to emit each instruction into fragment of its own.
		if (Assembler.getBackend().needAlign(OS))
		return !F.hasInstructions();

// When bundling is enabled, we don't want to add data to a fragment that		// When bundling is enabled, we don't want to add data to a fragment that
// already has instructions (see MCELFStreamer::EmitInstToData for details)		// already has instructions (see MCELFStreamer::EmitInstToData for details)
if (Assembler.isBundlingEnabled())		if (Assembler.isBundlingEnabled())
return Assembler.getRelaxAll();		return Assembler.getRelaxAll();
// If the subtarget is changed mid fragment we start a new fragment to record		// If the subtarget is changed mid fragment we start a new fragment to record
// the new STI.		// the new STI.
return !STI \|\| F.getSubtargetInfo() == STI;		return !STI \|\| F.getSubtargetInfo() == STI;
}		}

MCDataFragment *		MCDataFragment *
MCObjectStreamer::getOrCreateDataFragment(const MCSubtargetInfo *STI) {		MCObjectStreamer::getOrCreateDataFragment(const MCSubtargetInfo *STI) {
MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());		MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
if (!F \|\| !CanReuseDataFragment(F, Assembler, STI)) {		if (!F \|\| !CanReuseDataFragment(F, this, STI)) {
F = new MCDataFragment();		F = new MCDataFragment();
insert(F);		insert(F);
}		}
return F;		return F;
}		}

		MCBoundaryAlignFragment *MCObjectStreamer::getOrCreateBoundaryAlignFragment() {
		auto *F = dyn_cast_or_null<MCBoundaryAlignFragment>(getCurrentFragment());
		if (!F \|\| F->hasEmit()) {
		F = new MCBoundaryAlignFragment();
		insert(F);
		}
		return F;
		}

void MCObjectStreamer::visitUsedSymbol(const MCSymbol &Sym) {		void MCObjectStreamer::visitUsedSymbol(const MCSymbol &Sym) {
Assembler->registerSymbol(Sym);		Assembler->registerSymbol(Sym);
}		}

void MCObjectStreamer::EmitCFISections(bool EH, bool Debug) {		void MCObjectStreamer::EmitCFISections(bool EH, bool Debug) {
MCStreamer::EmitCFISections(EH, Debug);		MCStreamer::EmitCFISections(EH, Debug);
EmitEHFrame = EH;		EmitEHFrame = EH;
EmitDebugFrame = Debug;		EmitDebugFrame = Debug;
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