forked from OSchip/llvm-project
MC/X86: Add a dummy implementation of MCFixup generation for hacky X86 MCCodeEmitter.
llvm-svn: 95709
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b311a6b3ae
commit
0e42dc0dac
llvm/lib/Target/X86
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@ -648,6 +648,12 @@ void Emitter<CodeEmitter>::emitInstruction(const MachineInstr &MI,
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break;
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}
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// FIXME: Only used by hackish MCCodeEmitter, remove when dead.
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if (MO.isJTI()) {
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emitJumpTableAddress(MO.getIndex(), X86::reloc_pcrel_word);
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break;
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}
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assert(MO.isImm() && "Unknown RawFrm operand!");
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if (Opcode == X86::CALLpcrel32 || Opcode == X86::CALL64pcrel32) {
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// Fix up immediate operand for pc relative calls.
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@ -872,11 +878,13 @@ void Emitter<CodeEmitter>::emitInstruction(const MachineInstr &MI,
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namespace {
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class MCSingleInstructionCodeEmitter : public MachineCodeEmitter {
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uint8_t Data[256];
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SmallVectorImpl<MCFixup> *FixupList;
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public:
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MCSingleInstructionCodeEmitter() { reset(); }
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MCSingleInstructionCodeEmitter() { reset(0); }
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void reset() {
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void reset(SmallVectorImpl<MCFixup> *Fixups) {
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FixupList = Fixups;
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BufferBegin = Data;
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BufferEnd = array_endof(Data);
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CurBufferPtr = Data;
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@ -889,23 +897,50 @@ public:
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virtual void startFunction(MachineFunction &F) {}
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virtual bool finishFunction(MachineFunction &F) { return false; }
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virtual void emitLabel(uint64_t LabelID) {}
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virtual void StartMachineBasicBlock(MachineBasicBlock *MBB) {}
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virtual bool earlyResolveAddresses() const { return false; }
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virtual void addRelocation(const MachineRelocation &MR) { }
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virtual void addRelocation(const MachineRelocation &MR) {
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unsigned Offset = 0, OpIndex = 0, Kind = MR.getRelocationType();
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// This form is only used in one case, for branches.
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if (MR.isBasicBlock()) {
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Offset = unsigned(MR.getMachineCodeOffset());
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OpIndex = 0;
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} else {
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assert(MR.isJumpTableIndex() && "Unexpected relocation!");
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Offset = unsigned(MR.getMachineCodeOffset());
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// The operand index is encoded as the first byte of the fake operand.
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OpIndex = MR.getJumpTableIndex();
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}
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FixupList->push_back(MCFixup::Create(Offset, OpIndex,
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MCFixupKind(FirstTargetFixupKind + Kind)));
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}
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virtual void setModuleInfo(MachineModuleInfo* Info) {}
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// Interface functions which should never get called in our usage.
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virtual void emitLabel(uint64_t LabelID) {
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assert(0 && "Unexpected code emitter call!");
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}
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virtual uintptr_t getConstantPoolEntryAddress(unsigned Index) const {
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assert(0 && "Unexpected code emitter call!");
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return 0;
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}
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virtual uintptr_t getJumpTableEntryAddress(unsigned Index) const {
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assert(0 && "Unexpected code emitter call!");
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return 0;
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}
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virtual uintptr_t getMachineBasicBlockAddress(MachineBasicBlock *MBB) const {
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assert(0 && "Unexpected code emitter call!");
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return 0;
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}
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virtual uintptr_t getLabelAddress(uint64_t LabelID) const {
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assert(0 && "Unexpected code emitter call!");
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return 0;
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}
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virtual void setModuleInfo(MachineModuleInfo* Info) {}
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};
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class X86MCCodeEmitter : public MCCodeEmitter {
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@ -993,8 +1028,9 @@ public:
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return true;
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}
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// FIXME: Relocation / fixup.
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Instr->addOperand(MachineOperand::CreateImm(0));
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// Fake this as an external symbol to the code emitter to add a relcoation
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// entry we will recognize.
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Instr->addOperand(MachineOperand::CreateJTI(Start, 0));
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return true;
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}
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@ -1127,7 +1163,7 @@ public:
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Instr->dump();
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}
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InstrEmitter->reset();
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InstrEmitter->reset(&Fixups);
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if (OK)
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Emit->emitInstruction(*Instr, &Desc);
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OS << InstrEmitter->str();
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