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Implement va_start.
llvm-svn: 18011
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0c79788bc4
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@ -34,6 +34,7 @@ namespace {
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TargetMachine &TM;
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TargetMachine &TM;
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MachineFunction *F; // The function we are compiling into
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MachineFunction *F; // The function we are compiling into
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MachineBasicBlock *BB; // The current MBB we are compiling
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MachineBasicBlock *BB; // The current MBB we are compiling
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int VarArgsOffset; // Offset from fp for start of varargs area
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std::map<Value*, unsigned> RegMap; // Mapping between Val's and SSA Regs
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std::map<Value*, unsigned> RegMap; // Mapping between Val's and SSA Regs
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@ -445,6 +446,12 @@ void V8ISel::LoadArgumentsToVirtualRegs (Function *LF) {
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assert (0 && "Unknown class?!");
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assert (0 && "Unknown class?!");
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}
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}
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}
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}
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// If the function takes variable number of arguments, remember the fp
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// offset for the start of the first vararg value... this is used to expand
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// llvm.va_start.
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if (LF->getFunctionType ()->isVarArg ())
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VarArgsOffset = ArgOffset;
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}
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}
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void V8ISel::SelectPHINodes() {
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void V8ISel::SelectPHINodes() {
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@ -1341,6 +1348,10 @@ void V8ISel::LowerUnknownIntrinsicFunctionCalls(Function &F) {
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if (CallInst *CI = dyn_cast<CallInst>(I++))
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if (CallInst *CI = dyn_cast<CallInst>(I++))
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if (Function *F = CI->getCalledFunction())
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if (Function *F = CI->getCalledFunction())
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switch (F->getIntrinsicID()) {
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switch (F->getIntrinsicID()) {
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case Intrinsic::vastart:
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case Intrinsic::vacopy:
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case Intrinsic::vaend:
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// We directly implement these intrinsics
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case Intrinsic::not_intrinsic: break;
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case Intrinsic::not_intrinsic: break;
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default:
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default:
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// All other intrinsic calls we must lower.
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// All other intrinsic calls we must lower.
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@ -1360,8 +1371,11 @@ void V8ISel::visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI) {
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default:
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default:
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std::cerr << "Sorry, unknown intrinsic function call:\n" << CI; abort ();
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std::cerr << "Sorry, unknown intrinsic function call:\n" << CI; abort ();
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case Intrinsic::vastart:
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case Intrinsic::vastart: {
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std::cerr << "Sorry, va_start intrinsic still unsupported:\n" << CI; abort ();
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unsigned DestReg = getReg (CI);
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BuildMI (BB, V8::ADDri, 2, DestReg).addReg (V8::FP).addSImm (VarArgsOffset);
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return;
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}
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case Intrinsic::vaend:
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case Intrinsic::vaend:
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// va_end is a no-op on SparcV8.
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// va_end is a no-op on SparcV8.
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