RValue ArgumentSource::getAsRValue(SILGenFunction &gen, SGFContext C) && {
assert(!isLValue());
if (isRValue())
return std::move(*this).asKnownRValue();
return gen.emitRValue(std::move(*this).asKnownExpr(), C);
}
/// Specialized emitter for Builtin.addressOfBorrow.
static ManagedValue emitBuiltinAddressOfBorrow(SILGenFunction &SGF,
SILLocation loc,
SubstitutionMap substitutions,
PreparedArguments &&preparedArgs,
SGFContext C) {
SILType rawPointerType = SILType::getRawPointerType(SGF.getASTContext());
auto argsOrError = decomposeArguments(SGF, loc, std::move(preparedArgs), 1);
if (!argsOrError)
return SGF.emitUndef(rawPointerType);
auto argument = (*argsOrError)[0];
SILValue addr;
// Try to borrow the argument at +0. We only support if it's
// naturally emitted borrowed in memory.
auto borrow = SGF.emitRValue(argument, SGFContext::AllowGuaranteedPlusZero)
.getAsSingleValue(SGF, argument);
if (!borrow.isPlusZero() || !borrow.getType().isAddress()) {
SGF.SGM.diagnose(argument->getLoc(), diag::non_borrowed_indirect_addressof);
return SGF.emitUndef(rawPointerType);
}
addr = borrow.getValue();
// Take the address argument and cast it to RawPointer.
SILValue result = SGF.B.createAddressToPointer(loc, addr,
rawPointerType);
return ManagedValue::forUnmanaged(result);
}
RValue ArgumentSource::getAsRValue(SILGenFunction &SGF, SGFContext C) && {
switch (StoredKind) {
case Kind::Invalid:
llvm_unreachable("argument source is invalid");
case Kind::LValue:
llvm_unreachable("cannot get l-value as r-value");
case Kind::RValue:
return std::move(*this).asKnownRValue(SGF);
case Kind::Expr:
return SGF.emitRValue(std::move(*this).asKnownExpr(), C);
}
llvm_unreachable("bad kind");
}
static void emitImplicitValueConstructor(SILGenFunction &gen,
ConstructorDecl *ctor) {
RegularLocation Loc(ctor);
Loc.markAutoGenerated();
// FIXME: Handle 'self' along with the other arguments.
auto *paramList = ctor->getParameterList(1);
auto selfTyCan = ctor->getImplicitSelfDecl()->getType()->getInOutObjectType();
SILType selfTy = gen.getLoweredType(selfTyCan);
// Emit the indirect return argument, if any.
SILValue resultSlot;
if (selfTy.isAddressOnly(gen.SGM.M)) {
auto &AC = gen.getASTContext();
auto VD = new (AC) ParamDecl(/*IsLet*/ false, SourceLoc(), SourceLoc(),
AC.getIdentifier("$return_value"),
SourceLoc(),
AC.getIdentifier("$return_value"), selfTyCan,
ctor);
resultSlot = new (gen.F.getModule()) SILArgument(gen.F.begin(), selfTy, VD);
}
// Emit the elementwise arguments.
SmallVector<RValue, 4> elements;
for (size_t i = 0, size = paramList->size(); i < size; ++i) {
auto ¶m = paramList->get(i);
elements.push_back(
emitImplicitValueConstructorArg(gen, Loc,
param->getType()->getCanonicalType(),
ctor));
}
emitConstructorMetatypeArg(gen, ctor);
auto *decl = selfTy.getStructOrBoundGenericStruct();
assert(decl && "not a struct?!");
// If we have an indirect return slot, initialize it in-place.
if (resultSlot) {
auto elti = elements.begin(), eltEnd = elements.end();
for (VarDecl *field : decl->getStoredProperties()) {
auto fieldTy = selfTy.getFieldType(field, gen.SGM.M);
auto &fieldTL = gen.getTypeLowering(fieldTy);
SILValue slot = gen.B.createStructElementAddr(Loc, resultSlot, field,
fieldTL.getLoweredType().getAddressType());
InitializationPtr init(new KnownAddressInitialization(slot));
// An initialized 'let' property has a single value specified by the
// initializer - it doesn't come from an argument.
if (!field->isStatic() && field->isLet() &&
field->getParentInitializer()) {
assert(field->getType()->isEqual(field->getParentInitializer()
->getType()) && "Checked by sema");
// Cleanup after this initialization.
FullExpr scope(gen.Cleanups, field->getParentPatternBinding());
gen.emitExprInto(field->getParentInitializer(), init.get());
continue;
}
assert(elti != eltEnd && "number of args does not match number of fields");
(void)eltEnd;
std::move(*elti).forwardInto(gen, Loc, init.get());
++elti;
}
gen.B.createReturn(ImplicitReturnLocation::getImplicitReturnLoc(Loc),
gen.emitEmptyTuple(Loc));
return;
}
// Otherwise, build a struct value directly from the elements.
SmallVector<SILValue, 4> eltValues;
auto elti = elements.begin(), eltEnd = elements.end();
for (VarDecl *field : decl->getStoredProperties()) {
auto fieldTy = selfTy.getFieldType(field, gen.SGM.M);
SILValue v;
// An initialized 'let' property has a single value specified by the
// initializer - it doesn't come from an argument.
if (!field->isStatic() && field->isLet() && field->getParentInitializer()) {
// Cleanup after this initialization.
FullExpr scope(gen.Cleanups, field->getParentPatternBinding());
v = gen.emitRValue(field->getParentInitializer())
.forwardAsSingleStorageValue(gen, fieldTy, Loc);
} else {
assert(elti != eltEnd && "number of args does not match number of fields");
(void)eltEnd;
v = std::move(*elti).forwardAsSingleStorageValue(gen, fieldTy, Loc);
++elti;
}
eltValues.push_back(v);
}
SILValue selfValue = gen.B.createStruct(Loc, selfTy, eltValues);
gen.B.createReturn(ImplicitReturnLocation::getImplicitReturnLoc(Loc),
selfValue);
return;
}
