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Factor the trampoline transformation into a subroutine.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42021 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
parent
53f0bc1b25
commit
cdb6d929d0
@ -235,6 +235,7 @@ namespace {
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private:
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Instruction *visitCallSite(CallSite CS);
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bool transformConstExprCastCall(CallSite CS);
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Instruction *transformCallThroughTrampoline(CallSite CS);
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public:
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// InsertNewInstBefore - insert an instruction New before instruction Old
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@ -7834,6 +7835,11 @@ Instruction *InstCombiner::visitCallSite(CallSite CS) {
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return EraseInstFromFunction(*CS.getInstruction());
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}
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if (BitCastInst *BC = dyn_cast<BitCastInst>(Callee))
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if (IntrinsicInst *In = dyn_cast<IntrinsicInst>(BC->getOperand(0)))
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if (In->getIntrinsicID() == Intrinsic::init_trampoline)
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return transformCallThroughTrampoline(CS);
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const PointerType *PTy = cast<PointerType>(Callee->getType());
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const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
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if (FTy->isVarArg()) {
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@ -7852,143 +7858,6 @@ Instruction *InstCombiner::visitCallSite(CallSite CS) {
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}
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}
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if (BitCastInst *BC = dyn_cast<BitCastInst>(Callee)) {
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IntrinsicInst *In = dyn_cast<IntrinsicInst>(BC->getOperand(0));
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if (In && In->getIntrinsicID() == Intrinsic::init_trampoline) {
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Function *NestF =
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cast<Function>(IntrinsicInst::StripPointerCasts(In->getOperand(2)));
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const PointerType *NestFPTy = cast<PointerType>(NestF->getType());
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const FunctionType *NestFTy =
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cast<FunctionType>(NestFPTy->getElementType());
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if (const ParamAttrsList *NestAttrs = NestFTy->getParamAttrs()) {
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unsigned NestIdx = 1;
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const Type *NestTy = 0;
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uint16_t NestAttr = 0;
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Instruction *Caller = CS.getInstruction();
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// Look for a parameter marked with the 'nest' attribute.
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for (FunctionType::param_iterator I = NestFTy->param_begin(),
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E = NestFTy->param_end(); I != E; ++NestIdx, ++I)
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if (NestAttrs->paramHasAttr(NestIdx, ParamAttr::Nest)) {
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// Record the parameter type and any other attributes.
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NestTy = *I;
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NestAttr = NestAttrs->getParamAttrs(NestIdx);
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break;
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}
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if (NestTy) {
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std::vector<Value*> NewArgs;
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NewArgs.reserve(unsigned(CS.arg_end()-CS.arg_begin())+1);
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// Insert the nest argument into the call argument list, which may
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// mean appending it.
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{
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unsigned Idx = 1;
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CallSite::arg_iterator I = CS.arg_begin(), E = CS.arg_end();
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do {
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if (Idx == NestIdx) {
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// Add the chain argument.
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Value *NestVal = In->getOperand(3);
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if (NestVal->getType() != NestTy)
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NestVal = new BitCastInst(NestVal, NestTy, "nest", Caller);
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NewArgs.push_back(NestVal);
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}
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if (I == E)
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break;
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// Add the original argument.
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NewArgs.push_back(*I);
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++Idx, ++I;
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} while (1);
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}
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// The trampoline may have been bitcast to a bogus type (FTy).
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// Handle this by synthesizing a new function type, equal to FTy
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// with the chain parameter inserted. Likewise for attributes.
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const ParamAttrsList *Attrs = FTy->getParamAttrs();
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std::vector<const Type*> NewTypes;
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ParamAttrsVector NewAttrs;
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NewTypes.reserve(FTy->getNumParams()+1);
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// Add any function result attributes.
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uint16_t Attr = Attrs ? Attrs->getParamAttrs(0) : 0;
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if (Attr)
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NewAttrs.push_back (ParamAttrsWithIndex::get(0, Attr));
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// Insert the chain's type into the list of parameter types, which may
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// mean appending it. Likewise for the chain's attributes.
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{
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unsigned Idx = 1;
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FunctionType::param_iterator I = FTy->param_begin(),
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E = FTy->param_end();
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do {
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if (Idx == NestIdx) {
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// Add the chain's type and attributes.
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NewTypes.push_back(NestTy);
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NewAttrs.push_back(ParamAttrsWithIndex::get(NestIdx, NestAttr));
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}
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if (I == E)
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break;
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// Add the original type and attributes.
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NewTypes.push_back(*I);
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Attr = Attrs ? Attrs->getParamAttrs(Idx) : 0;
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if (Attr)
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NewAttrs.push_back
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(ParamAttrsWithIndex::get(Idx + (Idx >= NestIdx), Attr));
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++Idx, ++I;
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} while (1);
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}
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// Replace the trampoline call with a direct call. Let the generic
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// code sort out any function type mismatches.
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FunctionType *NewFTy =
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FunctionType::get(FTy->getReturnType(), NewTypes, FTy->isVarArg(),
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ParamAttrsList::get(NewAttrs));
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Constant *NewCallee = NestF->getType() == PointerType::get(NewFTy) ?
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NestF : ConstantExpr::getBitCast(NestF, PointerType::get(NewFTy));
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Instruction *NewCaller;
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if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) {
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NewCaller = new InvokeInst(NewCallee, II->getNormalDest(),
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II->getUnwindDest(), NewArgs.begin(),
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NewArgs.end(), Caller->getName(),
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Caller);
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cast<InvokeInst>(NewCaller)->setCallingConv(II->getCallingConv());
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} else {
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NewCaller = new CallInst(NewCallee, NewArgs.begin(), NewArgs.end(),
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Caller->getName(), Caller);
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if (cast<CallInst>(Caller)->isTailCall())
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cast<CallInst>(NewCaller)->setTailCall();
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cast<CallInst>(NewCaller)->
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setCallingConv(cast<CallInst>(Caller)->getCallingConv());
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}
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if (Caller->getType() != Type::VoidTy && !Caller->use_empty())
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Caller->replaceAllUsesWith(NewCaller);
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Caller->eraseFromParent();
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RemoveFromWorkList(Caller);
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return 0;
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}
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}
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// Replace the trampoline call with a direct call. Since there is no
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// 'nest' parameter, there is no need to adjust the argument list. Let
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// the generic code sort out any function type mismatches.
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Constant *NewCallee = NestF->getType() == PTy ?
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NestF : ConstantExpr::getBitCast(NestF, PTy);
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CS.setCalledFunction(NewCallee);
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Changed = true;
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}
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}
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return Changed ? CS.getInstruction() : 0;
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}
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@ -8191,6 +8060,148 @@ bool InstCombiner::transformConstExprCastCall(CallSite CS) {
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return true;
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}
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// transformCallThroughTrampoline - Turn a call to a function created by the
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// init_trampoline intrinsic into a direct call to the underlying function.
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//
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Instruction *InstCombiner::transformCallThroughTrampoline(CallSite CS) {
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Value *Callee = CS.getCalledValue();
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const PointerType *PTy = cast<PointerType>(Callee->getType());
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const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
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IntrinsicInst *Tramp =
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cast<IntrinsicInst>(cast<BitCastInst>(Callee)->getOperand(0));
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Function *NestF =
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cast<Function>(IntrinsicInst::StripPointerCasts(Tramp->getOperand(2)));
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const PointerType *NestFPTy = cast<PointerType>(NestF->getType());
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const FunctionType *NestFTy = cast<FunctionType>(NestFPTy->getElementType());
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if (const ParamAttrsList *NestAttrs = NestFTy->getParamAttrs()) {
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unsigned NestIdx = 1;
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const Type *NestTy = 0;
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uint16_t NestAttr = 0;
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// Look for a parameter marked with the 'nest' attribute.
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for (FunctionType::param_iterator I = NestFTy->param_begin(),
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E = NestFTy->param_end(); I != E; ++NestIdx, ++I)
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if (NestAttrs->paramHasAttr(NestIdx, ParamAttr::Nest)) {
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// Record the parameter type and any other attributes.
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NestTy = *I;
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NestAttr = NestAttrs->getParamAttrs(NestIdx);
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break;
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}
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if (NestTy) {
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Instruction *Caller = CS.getInstruction();
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std::vector<Value*> NewArgs;
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NewArgs.reserve(unsigned(CS.arg_end()-CS.arg_begin())+1);
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// Insert the nest argument into the call argument list, which may
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// mean appending it.
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{
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unsigned Idx = 1;
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CallSite::arg_iterator I = CS.arg_begin(), E = CS.arg_end();
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do {
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if (Idx == NestIdx) {
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// Add the chain argument.
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Value *NestVal = Tramp->getOperand(3);
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if (NestVal->getType() != NestTy)
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NestVal = new BitCastInst(NestVal, NestTy, "nest", Caller);
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NewArgs.push_back(NestVal);
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}
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if (I == E)
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break;
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// Add the original argument.
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NewArgs.push_back(*I);
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++Idx, ++I;
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} while (1);
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}
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// The trampoline may have been bitcast to a bogus type (FTy).
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// Handle this by synthesizing a new function type, equal to FTy
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// with the chain parameter inserted. Likewise for attributes.
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const ParamAttrsList *Attrs = FTy->getParamAttrs();
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std::vector<const Type*> NewTypes;
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ParamAttrsVector NewAttrs;
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NewTypes.reserve(FTy->getNumParams()+1);
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// Add any function result attributes.
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uint16_t Attr = Attrs ? Attrs->getParamAttrs(0) : 0;
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if (Attr)
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NewAttrs.push_back (ParamAttrsWithIndex::get(0, Attr));
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// Insert the chain's type into the list of parameter types, which may
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// mean appending it. Likewise for the chain's attributes.
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{
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unsigned Idx = 1;
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FunctionType::param_iterator I = FTy->param_begin(),
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E = FTy->param_end();
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do {
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if (Idx == NestIdx) {
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// Add the chain's type and attributes.
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NewTypes.push_back(NestTy);
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NewAttrs.push_back(ParamAttrsWithIndex::get(NestIdx, NestAttr));
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}
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if (I == E)
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break;
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// Add the original type and attributes.
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NewTypes.push_back(*I);
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Attr = Attrs ? Attrs->getParamAttrs(Idx) : 0;
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if (Attr)
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NewAttrs.push_back
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(ParamAttrsWithIndex::get(Idx + (Idx >= NestIdx), Attr));
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++Idx, ++I;
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} while (1);
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}
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// Replace the trampoline call with a direct call. Let the generic
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// code sort out any function type mismatches.
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FunctionType *NewFTy =
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FunctionType::get(FTy->getReturnType(), NewTypes, FTy->isVarArg(),
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ParamAttrsList::get(NewAttrs));
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Constant *NewCallee = NestF->getType() == PointerType::get(NewFTy) ?
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NestF : ConstantExpr::getBitCast(NestF, PointerType::get(NewFTy));
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Instruction *NewCaller;
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if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) {
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NewCaller = new InvokeInst(NewCallee,
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II->getNormalDest(), II->getUnwindDest(),
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NewArgs.begin(), NewArgs.end(),
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Caller->getName(), Caller);
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cast<InvokeInst>(NewCaller)->setCallingConv(II->getCallingConv());
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} else {
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NewCaller = new CallInst(NewCallee, NewArgs.begin(), NewArgs.end(),
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Caller->getName(), Caller);
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if (cast<CallInst>(Caller)->isTailCall())
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cast<CallInst>(NewCaller)->setTailCall();
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cast<CallInst>(NewCaller)->
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setCallingConv(cast<CallInst>(Caller)->getCallingConv());
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}
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if (Caller->getType() != Type::VoidTy && !Caller->use_empty())
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Caller->replaceAllUsesWith(NewCaller);
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Caller->eraseFromParent();
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RemoveFromWorkList(Caller);
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return 0;
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}
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}
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// Replace the trampoline call with a direct call. Since there is no 'nest'
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// parameter, there is no need to adjust the argument list. Let the generic
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// code sort out any function type mismatches.
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Constant *NewCallee =
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NestF->getType() == PTy ? NestF : ConstantExpr::getBitCast(NestF, PTy);
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CS.setCalledFunction(NewCallee);
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return CS.getInstruction();
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}
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/// FoldPHIArgBinOpIntoPHI - If we have something like phi [add (a,b), add(c,d)]
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/// and if a/b/c/d and the add's all have a single use, turn this into two phi's
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/// and a single binop.
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