ManagedValue SILGenFunction::manageOpaqueValue(OpaqueValueState &entry,
SILLocation loc,
SGFContext C) {
// If the opaque value is consumable, we can just return the
// value with a cleanup. There is no need to retain it separately.
if (entry.IsConsumable) {
assert(!entry.HasBeenConsumed
&& "Uniquely-referenced opaque value already consumed");
entry.HasBeenConsumed = true;
return entry.Value;
}
assert(!entry.Value.hasCleanup());
// If the context wants a +0 value, guaranteed or immediate, we can
// give it to them, because OpenExistential emission guarantees the
// value.
if (C.isGuaranteedPlusZeroOk()) {
return entry.Value;
}
// If the context wants us to initialize a buffer, copy there instead
// of making a temporary allocation.
if (auto I = C.getEmitInto()) {
if (SILValue address = I->getAddressForInPlaceInitialization()) {
entry.Value.copyInto(*this, address, loc);
I->finishInitialization(*this);
return ManagedValue::forInContext();
}
}
// Otherwise, copy the value into a temporary.
return entry.Value.copyUnmanaged(*this, loc);
}
ManagedValue SILGenBuilder::formalAccessBufferForExpr(
SILLocation loc, SILType ty, const TypeLowering &lowering,
SGFContext context, llvm::function_ref<void(SILValue)> rvalueEmitter) {
// If we have a single-buffer "emit into" initialization, use that for the
// result.
SILValue address = context.getAddressForInPlaceInitialization(SGF, loc);
// If we couldn't emit into the Initialization, emit into a temporary
// allocation.
if (!address) {
address = SGF.emitTemporaryAllocation(loc, ty.getObjectType());
}
rvalueEmitter(address);
// If we have a single-buffer "emit into" initialization, use that for the
// result.
if (context.finishInPlaceInitialization(SGF)) {
return ManagedValue::forInContext();
}
// Add a cleanup for the temporary we allocated.
if (lowering.isTrivial())
return ManagedValue::forUnmanaged(address);
return SGF.emitFormalAccessManagedBufferWithCleanup(loc, address);
}
ManagedValue ArgumentSource::getAsSingleValue(SILGenFunction &SGF,
SGFContext C) && {
switch (StoredKind) {
case Kind::Invalid:
llvm_unreachable("argument source is invalid");
case Kind::LValue: {
auto loc = getKnownLValueLocation();
LValue &&lv = std::move(*this).asKnownLValue();
return SGF.emitAddressOfLValue(loc, std::move(lv));
}
case Kind::RValue: {
auto loc = getKnownRValueLocation();
if (auto init = C.getEmitInto()) {
std::move(*this).asKnownRValue(SGF)
.ensurePlusOne(SGF, loc)
.forwardInto(SGF, loc, init);
return ManagedValue::forInContext();
} else {
return std::move(*this).asKnownRValue(SGF).getAsSingleValue(SGF, loc);
}
}
case Kind::Expr: {
auto e = std::move(*this).asKnownExpr();
if (e->isSemanticallyInOutExpr()) {
auto lv = SGF.emitLValue(e, SGFAccessKind::ReadWrite);
return SGF.emitAddressOfLValue(e, std::move(lv));
} else {
return SGF.emitRValueAsSingleValue(e, C);
}
}
}
llvm_unreachable("bad kind");
}
RValue
ArgumentSource::getKnownTupleAsRValue(SILGenFunction &SGF, SGFContext C) && {
return std::move(*this).withKnownTupleElementSources<RValue>(
[&](SILLocation loc, CanTupleType type,
MutableArrayRef<ArgumentSource> elements) {
// If there's a target initialization, and we can split it, do so.
if (auto init = C.getEmitInto()) {
if (init->canSplitIntoTupleElements()) {
// Split the tuple.
SmallVector<InitializationPtr, 4> scratch;
auto eltInits = init->splitIntoTupleElements(SGF, loc, type, scratch);
// Emit each element into the corresponding element initialization.
for (auto i : indices(eltInits)) {
std::move(elements[i]).forwardInto(SGF, eltInits[i].get());
}
// Finish initialization.
init->finishInitialization(SGF);
return RValue::forInContext();
}
}
// Otherwise, emit all of the elements into a single big r-value.
RValue result(type);
for (auto &element : elements) {
result.addElement(std::move(element).getAsRValue(SGF));
}
return result;
});
}
static ManagedValue emitBuiltinTypeTrait(SILGenFunction &gen,
SILLocation loc,
SubstitutionList substitutions,
ArrayRef<ManagedValue> args,
CanFunctionType formalApplyType,
SGFContext C) {
assert(substitutions.size() == 1
&& "type trait should take a single type parameter");
assert(args.size() == 1
&& "type trait should take a single argument");
unsigned result;
auto traitTy = substitutions[0].getReplacement()->getCanonicalType();
switch ((traitTy.getPointer()->*Trait)()) {
// If the type obviously has or lacks the trait, emit a constant result.
case TypeTraitResult::IsNot:
result = 0;
break;
case TypeTraitResult::Is:
result = 1;
break;
// If not, emit the builtin call normally. Specialization may be able to
// eliminate it later, or we'll lower it away at IRGen time.
case TypeTraitResult::CanBe: {
auto &C = gen.getASTContext();
auto int8Ty = BuiltinIntegerType::get(8, C)->getCanonicalType();
auto apply = gen.B.createBuiltin(loc,
C.getIdentifier(getBuiltinName(Kind)),
SILType::getPrimitiveObjectType(int8Ty),
substitutions, args[0].getValue());
return ManagedValue::forUnmanaged(apply);
}
}
// Produce the result as an integer literal constant.
auto val = gen.B.createIntegerLiteral(
loc, SILType::getBuiltinIntegerType(8, gen.getASTContext()),
(uintmax_t)result);
return ManagedValue::forUnmanaged(val);
}
ManagedValue ArgumentSource::getAsSingleValue(SILGenFunction &SGF,
SGFContext C) && {
switch (StoredKind) {
case Kind::Invalid:
llvm_unreachable("argument source is invalid");
case Kind::LValue: {
auto loc = getKnownLValueLocation();
return SGF.emitAddressOfLValue(loc, std::move(*this).asKnownLValue(),
AccessKind::ReadWrite);
}
case Kind::RValue: {
auto loc = getKnownRValueLocation();
if (auto init = C.getEmitInto()) {
std::move(*this).asKnownRValue().forwardInto(SGF, loc, init);
return ManagedValue::forInContext();
} else {
return std::move(*this).asKnownRValue().getAsSingleValue(SGF, loc);
}
}
case Kind::Expr: {
auto e = std::move(*this).asKnownExpr();
if (e->getType()->is<InOutType>()) {
return SGF.emitAddressOfLValue(e, SGF.emitLValue(e, AccessKind::ReadWrite),
AccessKind::ReadWrite);
} else {
return SGF.emitRValueAsSingleValue(e, C);
}
}
case Kind::Tuple: {
auto loc = getKnownTupleLocation();
auto rvalue = std::move(*this).getKnownTupleAsRValue(SGF, C);
if (rvalue.isInContext())
return ManagedValue::forInContext();
return std::move(rvalue).getAsSingleValue(SGF, loc);
}
}
llvm_unreachable("bad kind");
}
RValue Lowering::emitConditionalCheckedCast(SILGenFunction &SGF,
SILLocation loc,
ManagedValue operand,
Type operandType,
Type optTargetType,
CheckedCastKind castKind,
SGFContext C) {
// Drill into the result type.
CanType resultObjectType =
optTargetType->getCanonicalType().getAnyOptionalObjectType();
assert(resultObjectType);
// Handle collection downcasts directly; they have specific library
// entry points.
if (castKind == CheckedCastKind::ArrayDowncast ||
castKind == CheckedCastKind::DictionaryDowncast ||
castKind == CheckedCastKind::SetDowncast) {
return emitCollectionDowncastExpr(SGF, operand, operandType, loc,
resultObjectType, C,
/*conditional=*/true);
}
operand = adjustForConditionalCheckedCastOperand(loc, operand,
operandType->getCanonicalType(),
resultObjectType, SGF);
auto someDecl = SGF.getASTContext().getOptionalSomeDecl();
auto &resultTL = SGF.getTypeLowering(optTargetType);
// Set up a result buffer if desirable/required.
SILValue resultBuffer;
SILValue resultObjectBuffer;
Optional<TemporaryInitialization> resultObjectTemp;
SGFContext resultObjectCtx;
if (resultTL.isAddressOnly() ||
(C.getEmitInto() && C.getEmitInto()->getAddressOrNull())) {
SILType resultTy = resultTL.getLoweredType();
resultBuffer = SGF.getBufferForExprResult(loc, resultTy, C);
resultObjectBuffer =
SGF.B.createInitEnumDataAddr(loc, resultBuffer, someDecl,
resultTy.getAnyOptionalObjectType().getAddressType());
resultObjectTemp.emplace(resultObjectBuffer, CleanupHandle::invalid());
resultObjectCtx = SGFContext(&resultObjectTemp.getValue());
}
// Prepare a jump destination here.
ExitableFullExpr scope(SGF, CleanupLocation::get(loc));
auto operandCMV = ConsumableManagedValue::forOwned(operand);
SGF.emitCheckedCastBranch(loc, operandCMV, operandType,
resultObjectType, resultObjectCtx,
// The success path.
[&](ManagedValue objectValue) {
// If we're not emitting into a temporary, just wrap up the result
// in Some and go to the continuation block.
if (!resultObjectTemp) {
auto some = SGF.B.createEnum(loc, objectValue.forward(SGF),
someDecl, resultTL.getLoweredType());
SGF.Cleanups.emitBranchAndCleanups(scope.getExitDest(), loc, { some });
return;
}
// Otherwise, make sure the value is in the context.
if (!objectValue.isInContext()) {
objectValue.forwardInto(SGF, loc, resultObjectBuffer);
}
SGF.B.createInjectEnumAddr(loc, resultBuffer, someDecl);
SGF.Cleanups.emitBranchAndCleanups(scope.getExitDest(), loc);
},
// The failure path.
[&] {
auto noneDecl = SGF.getASTContext().getOptionalNoneDecl();
// If we're not emitting into a temporary, just wrap up the result
// in None and go to the continuation block.
if (!resultObjectTemp) {
auto none =
SGF.B.createEnum(loc, nullptr, noneDecl, resultTL.getLoweredType());
SGF.Cleanups.emitBranchAndCleanups(scope.getExitDest(), loc, { none });
// Just construct the enum directly in the context.
} else {
SGF.B.createInjectEnumAddr(loc, resultBuffer, noneDecl);
SGF.Cleanups.emitBranchAndCleanups(scope.getExitDest(), loc);
}
});
// Enter the continuation block.
auto contBB = scope.exit();
ManagedValue result;
if (resultObjectTemp) {
result = SGF.manageBufferForExprResult(resultBuffer, resultTL, C);
} else {
auto argument =
new (SGF.F.getModule()) SILArgument(contBB, resultTL.getLoweredType());
result = SGF.emitManagedRValueWithCleanup(argument, resultTL);
}
return RValue(SGF, loc, optTargetType->getCanonicalType(), result);
}