/// In this function we create the actual cloned function and its proper cloned
/// type. But we do not create any body. This implies that the creation of the
/// actual arguments in the function is in populateCloned.
///
/// \arg PAUser The function that is being passed the partial apply.
/// \arg PAI The partial apply that is being passed to PAUser.
/// \arg ClosureIndex The index of the partial apply in PAUser's function
/// signature.
/// \arg ClonedName The name of the cloned function that we will create.
SILFunction *
ClosureSpecCloner::initCloned(const CallSiteDescriptor &CallSiteDesc,
StringRef ClonedName) {
SILFunction *ClosureUser = CallSiteDesc.getApplyCallee();
// This is the list of new interface parameters of the cloned function.
llvm::SmallVector<SILParameterInfo, 4> NewParameterInfoList;
// First add to NewParameterInfoList all of the SILParameterInfo in the
// original function except for the closure.
CanSILFunctionType ClosureUserFunTy = ClosureUser->getLoweredFunctionType();
unsigned Index = ClosureUserFunTy->getNumIndirectResults();
for (auto ¶m : ClosureUserFunTy->getParameters()) {
if (Index != CallSiteDesc.getClosureIndex())
NewParameterInfoList.push_back(param);
++Index;
}
// Then add any arguments that are captured in the closure to the function's
// argument type. Since they are captured, we need to pass them directly into
// the new specialized function.
SILFunction *ClosedOverFun = CallSiteDesc.getClosureCallee();
CanSILFunctionType ClosedOverFunTy = ClosedOverFun->getLoweredFunctionType();
SILModule &M = ClosureUser->getModule();
// Captured parameters are always appended to the function signature. If the
// type of the captured argument is trivial, pass the argument as
// Direct_Unowned. Otherwise pass it as Direct_Owned.
//
// We use the type of the closure here since we allow for the closure to be an
// external declaration.
unsigned NumTotalParams = ClosedOverFunTy->getParameters().size();
unsigned NumNotCaptured = NumTotalParams - CallSiteDesc.getNumArguments();
for (auto &PInfo : ClosedOverFunTy->getParameters().slice(NumNotCaptured)) {
if (PInfo.getSILType().isTrivial(M)) {
SILParameterInfo NewPInfo(PInfo.getType(),
ParameterConvention::Direct_Unowned);
NewParameterInfoList.push_back(NewPInfo);
continue;
}
SILParameterInfo NewPInfo(PInfo.getType(),
ParameterConvention::Direct_Owned);
NewParameterInfoList.push_back(NewPInfo);
}
// The specialized function is always a thin function. This is important
// because we may add additional parameters after the Self parameter of
// witness methods. In this case the new function is not a method anymore.
auto ExtInfo = ClosureUserFunTy->getExtInfo();
ExtInfo = ExtInfo.withRepresentation(SILFunctionTypeRepresentation::Thin);
auto ClonedTy = SILFunctionType::get(
ClosureUserFunTy->getGenericSignature(), ExtInfo,
ClosureUserFunTy->getCalleeConvention(), NewParameterInfoList,
ClosureUserFunTy->getAllResults(),
ClosureUserFunTy->getOptionalErrorResult(),
M.getASTContext());
// We make this function bare so we don't have to worry about decls in the
// SILArgument.
auto *Fn = M.createFunction(
// It's important to use a shared linkage for the specialized function
// and not the original linkage.
// Otherwise the new function could have an external linkage (in case the
// original function was de-serialized) and would not be code-gen'd.
getSpecializedLinkage(ClosureUser, ClosureUser->getLinkage()),
ClonedName, ClonedTy,
ClosureUser->getGenericEnvironment(), ClosureUser->getLocation(),
IsBare, ClosureUser->isTransparent(), CallSiteDesc.isFragile(),
ClosureUser->isThunk(), ClosureUser->getClassVisibility(),
ClosureUser->getInlineStrategy(), ClosureUser->getEffectsKind(),
ClosureUser, ClosureUser->getDebugScope());
Fn->setDeclCtx(ClosureUser->getDeclContext());
if (ClosureUser->hasUnqualifiedOwnership()) {
Fn->setUnqualifiedOwnership();
}
for (auto &Attr : ClosureUser->getSemanticsAttrs())
Fn->addSemanticsAttr(Attr);
return Fn;
}
void FunctionSignatureTransform::createFunctionSignatureOptimizedFunction() {
// Create the optimized function !
SILModule &M = F->getModule();
std::string Name = createOptimizedSILFunctionName();
SILLinkage linkage = F->getLinkage();
if (isAvailableExternally(linkage))
linkage = SILLinkage::Shared;
DEBUG(llvm::dbgs() << " -> create specialized function " << Name << "\n");
NewF = M.createFunction(
linkage, Name, createOptimizedSILFunctionType(), nullptr,
F->getLocation(), F->isBare(), F->isTransparent(), F->isFragile(),
F->isThunk(), F->getClassVisibility(), F->getInlineStrategy(),
F->getEffectsKind(), nullptr, F->getDebugScope(), F->getDeclContext());
if (F->hasUnqualifiedOwnership()) {
NewF->setUnqualifiedOwnership();
}
// Then we transfer the body of F to NewF.
NewF->spliceBody(F);
NewF->setDeclCtx(F->getDeclContext());
// Array semantic clients rely on the signature being as in the original
// version.
for (auto &Attr : F->getSemanticsAttrs()) {
if (!StringRef(Attr).startswith("array."))
NewF->addSemanticsAttr(Attr);
}
// Do the last bit of work to the newly created optimized function.
ArgumentExplosionFinalizeOptimizedFunction();
DeadArgumentFinalizeOptimizedFunction();
// Create the thunk body !
F->setThunk(IsThunk);
// The thunk now carries the information on how the signature is
// optimized. If we inline the thunk, we will get the benefit of calling
// the signature optimized function without additional setup on the
// caller side.
F->setInlineStrategy(AlwaysInline);
SILBasicBlock *ThunkBody = F->createBasicBlock();
for (auto &ArgDesc : ArgumentDescList) {
ThunkBody->createFunctionArgument(ArgDesc.Arg->getType(), ArgDesc.Decl);
}
SILLocation Loc = ThunkBody->getParent()->getLocation();
SILBuilder Builder(ThunkBody);
Builder.setCurrentDebugScope(ThunkBody->getParent()->getDebugScope());
FunctionRefInst *FRI = Builder.createFunctionRef(Loc, NewF);
// Create the args for the thunk's apply, ignoring any dead arguments.
llvm::SmallVector<SILValue, 8> ThunkArgs;
for (auto &ArgDesc : ArgumentDescList) {
addThunkArgument(ArgDesc, Builder, ThunkBody, ThunkArgs);
}
// We are ignoring generic functions and functions with out parameters for
// now.
SILValue ReturnValue;
SILType LoweredType = NewF->getLoweredType();
SILType ResultType = NewF->getConventions().getSILResultType();
auto FunctionTy = LoweredType.castTo<SILFunctionType>();
if (FunctionTy->hasErrorResult()) {
// We need a try_apply to call a function with an error result.
SILFunction *Thunk = ThunkBody->getParent();
SILBasicBlock *NormalBlock = Thunk->createBasicBlock();
ReturnValue =
NormalBlock->createPHIArgument(ResultType, ValueOwnershipKind::Owned);
SILBasicBlock *ErrorBlock = Thunk->createBasicBlock();
SILType Error =
SILType::getPrimitiveObjectType(FunctionTy->getErrorResult().getType());
auto *ErrorArg =
ErrorBlock->createPHIArgument(Error, ValueOwnershipKind::Owned);
Builder.createTryApply(Loc, FRI, LoweredType, ArrayRef<Substitution>(),
ThunkArgs, NormalBlock, ErrorBlock);
Builder.setInsertionPoint(ErrorBlock);
Builder.createThrow(Loc, ErrorArg);
Builder.setInsertionPoint(NormalBlock);
} else {
ReturnValue = Builder.createApply(Loc, FRI, LoweredType, ResultType,
ArrayRef<Substitution>(), ThunkArgs,
false);
}
// Set up the return results.
if (NewF->isNoReturnFunction()) {
Builder.createUnreachable(Loc);
} else {
Builder.createReturn(Loc, ReturnValue);
}
// Do the last bit work to finalize the thunk.
OwnedToGuaranteedFinalizeThunkFunction(Builder, F);
assert(F->getDebugScope()->Parent != NewF->getDebugScope()->Parent);
}