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SILGenExpr.cpp
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//===--- SILGenExpr.cpp - Implements Lowering of ASTs -> SIL for Exprs ----===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "ArgumentScope.h"
#include "ArgumentSource.h"
#include "Callee.h"
#include "Condition.h"
#include "Conversion.h"
#include "Initialization.h"
#include "LValue.h"
#include "RValue.h"
#include "ResultPlan.h"
#include "SILGen.h"
#include "SILGenDynamicCast.h"
#include "SILGenFunctionBuilder.h"
#include "Scope.h"
#include "SwitchEnumBuilder.h"
#include "Varargs.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/ASTMangler.h"
#include "swift/AST/CanTypeVisitor.h"
#include "swift/AST/Decl.h"
#include "swift/AST/DiagnosticsCommon.h"
#include "swift/AST/ExistentialLayout.h"
#include "swift/AST/Expr.h"
#include "swift/AST/ForeignErrorConvention.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/ProtocolConformance.h"
#include "swift/AST/SubstitutionMap.h"
#include "swift/AST/Types.h"
#include "swift/Basic/SourceManager.h"
#include "swift/Basic/type_traits.h"
#include "swift/SIL/DynamicCasts.h"
#include "swift/SIL/SILArgument.h"
#include "swift/SIL/SILUndef.h"
#include "swift/SIL/TypeLowering.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ConvertUTF.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/SaveAndRestore.h"
#include "llvm/Support/raw_ostream.h"
#include "swift/AST/DiagnosticsSIL.h"
using namespace swift;
using namespace Lowering;
ManagedValue SILGenFunction::emitManagedRetain(SILLocation loc,
SILValue v) {
auto &lowering = getTypeLowering(v->getType());
return emitManagedRetain(loc, v, lowering);
}
ManagedValue SILGenFunction::emitManagedRetain(SILLocation loc,
SILValue v,
const TypeLowering &lowering) {
assert(lowering.getLoweredType() == v->getType());
if (lowering.isTrivial())
return ManagedValue::forUnmanaged(v);
if (v->getType().isObject() && v.getOwnershipKind() == OwnershipKind::None)
return ManagedValue::forUnmanaged(v);
assert((!lowering.isAddressOnly() || !silConv.useLoweredAddresses()) &&
"cannot retain an unloadable type");
v = lowering.emitCopyValue(B, loc, v);
return emitManagedRValueWithCleanup(v, lowering);
}
ManagedValue SILGenFunction::emitManagedLoadCopy(SILLocation loc, SILValue v) {
auto &lowering = getTypeLowering(v->getType());
return emitManagedLoadCopy(loc, v, lowering);
}
ManagedValue SILGenFunction::emitManagedLoadCopy(SILLocation loc, SILValue v,
const TypeLowering &lowering) {
assert(lowering.getLoweredType().getAddressType() == v->getType());
v = lowering.emitLoadOfCopy(B, loc, v, IsNotTake);
if (lowering.isTrivial())
return ManagedValue::forUnmanaged(v);
if (v.getOwnershipKind() == OwnershipKind::None)
return ManagedValue::forUnmanaged(v);
assert((!lowering.isAddressOnly() || !silConv.useLoweredAddresses()) &&
"cannot retain an unloadable type");
return emitManagedRValueWithCleanup(v, lowering);
}
ManagedValue SILGenFunction::emitManagedLoadBorrow(SILLocation loc,
SILValue v) {
auto &lowering = getTypeLowering(v->getType());
return emitManagedLoadBorrow(loc, v, lowering);
}
ManagedValue
SILGenFunction::emitManagedLoadBorrow(SILLocation loc, SILValue v,
const TypeLowering &lowering) {
assert(lowering.getLoweredType().getAddressType() == v->getType());
if (lowering.isTrivial()) {
v = lowering.emitLoadOfCopy(B, loc, v, IsNotTake);
return ManagedValue::forUnmanaged(v);
}
assert((!lowering.isAddressOnly() || !silConv.useLoweredAddresses()) &&
"cannot retain an unloadable type");
auto *lbi = B.createLoadBorrow(loc, v);
return emitManagedBorrowedRValueWithCleanup(v, lbi, lowering);
}
ManagedValue SILGenFunction::emitManagedStoreBorrow(SILLocation loc, SILValue v,
SILValue addr) {
auto &lowering = getTypeLowering(v->getType());
return emitManagedStoreBorrow(loc, v, addr, lowering);
}
ManagedValue SILGenFunction::emitManagedStoreBorrow(
SILLocation loc, SILValue v, SILValue addr, const TypeLowering &lowering) {
assert(lowering.getLoweredType().getObjectType() == v->getType());
if (lowering.isTrivial() || v.getOwnershipKind() == OwnershipKind::None) {
lowering.emitStore(B, loc, v, addr, StoreOwnershipQualifier::Trivial);
return ManagedValue::forUnmanaged(v);
}
assert((!lowering.isAddressOnly() || !silConv.useLoweredAddresses()) &&
"cannot retain an unloadable type");
auto *sbi = B.createStoreBorrow(loc, v, addr);
return emitManagedBorrowedRValueWithCleanup(sbi->getSrc(), sbi, lowering);
}
ManagedValue SILGenFunction::emitManagedBeginBorrow(SILLocation loc,
SILValue v) {
auto &lowering = getTypeLowering(v->getType());
return emitManagedBeginBorrow(loc, v, lowering);
}
ManagedValue
SILGenFunction::emitManagedBeginBorrow(SILLocation loc, SILValue v,
const TypeLowering &lowering) {
assert(lowering.getLoweredType().getObjectType() ==
v->getType().getObjectType());
if (lowering.isTrivial())
return ManagedValue::forUnmanaged(v);
if (v.getOwnershipKind() == OwnershipKind::None)
return ManagedValue::forUnmanaged(v);
if (v.getOwnershipKind() == OwnershipKind::Guaranteed)
return ManagedValue::forUnmanaged(v);
auto *bbi = B.createBeginBorrow(loc, v);
return emitManagedBorrowedRValueWithCleanup(v, bbi, lowering);
}
EndBorrowCleanup::EndBorrowCleanup(SILValue borrowedValue)
: borrowedValue(borrowedValue) {
if (auto *arg = dyn_cast<SILPhiArgument>(borrowedValue)) {
if (auto *ti = arg->getSingleTerminator()) {
assert(!ti->isTransformationTerminator() &&
"Transforming terminators do not have end_borrow");
}
}
}
void EndBorrowCleanup::emit(SILGenFunction &SGF, CleanupLocation l,
ForUnwind_t forUnwind) {
SGF.B.createEndBorrow(l, borrowedValue);
}
void EndBorrowCleanup::dump(SILGenFunction &) const {
#ifndef NDEBUG
llvm::errs() << "EndBorrowCleanup "
<< "State:" << getState() << "\n"
<< "borrowed:" << borrowedValue << "\n";
#endif
}
namespace {
struct FormalEvaluationEndBorrowCleanup : Cleanup {
FormalEvaluationContext::stable_iterator Depth;
FormalEvaluationEndBorrowCleanup() : Depth() {}
void emit(SILGenFunction &SGF, CleanupLocation l, ForUnwind_t forUnwind) override {
getEvaluation(SGF).finish(SGF);
}
void dump(SILGenFunction &SGF) const override {
#ifndef NDEBUG
llvm::errs() << "FormalEvaluationEndBorrowCleanup "
<< "State:" << getState() << "\n"
<< "original:" << getOriginalValue(SGF) << "\n"
<< "borrowed:" << getBorrowedValue(SGF) << "\n";
#endif
}
SharedBorrowFormalAccess &getEvaluation(SILGenFunction &SGF) const {
auto &evaluation = *SGF.FormalEvalContext.find(Depth);
assert(evaluation.getKind() == FormalAccess::Shared);
return static_cast<SharedBorrowFormalAccess &>(evaluation);
}
SILValue getOriginalValue(SILGenFunction &SGF) const {
return getEvaluation(SGF).getOriginalValue();
}
SILValue getBorrowedValue(SILGenFunction &SGF) const {
return getEvaluation(SGF).getBorrowedValue();
}
};
} // end anonymous namespace
ManagedValue
SILGenFunction::emitFormalEvaluationManagedBeginBorrow(SILLocation loc,
SILValue v) {
if (v.getOwnershipKind() == OwnershipKind::Guaranteed)
return ManagedValue::forUnmanaged(v);
auto &lowering = getTypeLowering(v->getType());
return emitFormalEvaluationManagedBeginBorrow(loc, v, lowering);
}
ManagedValue SILGenFunction::emitFormalEvaluationManagedBeginBorrow(
SILLocation loc, SILValue v, const TypeLowering &lowering) {
assert(lowering.getLoweredType().getObjectType() ==
v->getType().getObjectType());
if (lowering.isTrivial())
return ManagedValue::forUnmanaged(v);
if (v.getOwnershipKind() == OwnershipKind::Guaranteed)
return ManagedValue::forUnmanaged(v);
auto *bbi = B.createBeginBorrow(loc, v);
return emitFormalEvaluationManagedBorrowedRValueWithCleanup(loc, v, bbi,
lowering);
}
ManagedValue
SILGenFunction::emitFormalEvaluationManagedBorrowedRValueWithCleanup(
SILLocation loc, SILValue original, SILValue borrowed) {
auto &lowering = getTypeLowering(original->getType());
return emitFormalEvaluationManagedBorrowedRValueWithCleanup(
loc, original, borrowed, lowering);
}
ManagedValue
SILGenFunction::emitFormalEvaluationManagedBorrowedRValueWithCleanup(
SILLocation loc, SILValue original, SILValue borrowed,
const TypeLowering &lowering) {
assert(lowering.getLoweredType().getObjectType() ==
original->getType().getObjectType());
if (lowering.isTrivial())
return ManagedValue::forUnmanaged(borrowed);
if (!borrowed->getType().isObject()) {
return ManagedValue(borrowed, CleanupHandle::invalid());
}
assert(isInFormalEvaluationScope() && "Must be in formal evaluation scope");
auto &cleanup = Cleanups.pushCleanup<FormalEvaluationEndBorrowCleanup>();
CleanupHandle handle = Cleanups.getTopCleanup();
FormalEvalContext.push<SharedBorrowFormalAccess>(loc, handle, original,
borrowed);
cleanup.Depth = FormalEvalContext.stable_begin();
return ManagedValue(borrowed, CleanupHandle::invalid());
}
ManagedValue
SILGenFunction::emitManagedBorrowedArgumentWithCleanup(SILPhiArgument *arg) {
if (arg->getOwnershipKind() == OwnershipKind::None ||
arg->getType().isTrivial(F)) {
return ManagedValue::forUnmanaged(arg);
}
assert(arg->getOwnershipKind() == OwnershipKind::Guaranteed);
Cleanups.pushCleanup<EndBorrowCleanup>(arg);
return ManagedValue(arg, CleanupHandle::invalid());
}
ManagedValue
SILGenFunction::emitManagedBorrowedRValueWithCleanup(SILValue original,
SILValue borrowed) {
assert(original->getType().getObjectType() ==
borrowed->getType().getObjectType());
auto &lowering = getTypeLowering(original->getType());
return emitManagedBorrowedRValueWithCleanup(original, borrowed, lowering);
}
ManagedValue
SILGenFunction::emitManagedBorrowedRValueWithCleanup(SILValue borrowed) {
auto &lowering = getTypeLowering(borrowed->getType());
return emitManagedBorrowedRValueWithCleanup(borrowed, lowering);
}
ManagedValue SILGenFunction::emitManagedBorrowedRValueWithCleanup(
SILValue borrowed, const TypeLowering &lowering) {
assert(lowering.getLoweredType().getObjectType() ==
borrowed->getType().getObjectType());
if (lowering.isTrivial())
return ManagedValue::forUnmanaged(borrowed);
if (borrowed->getType().isObject() &&
borrowed.getOwnershipKind() == OwnershipKind::None)
return ManagedValue::forUnmanaged(borrowed);
if (borrowed->getType().isObject()) {
Cleanups.pushCleanup<EndBorrowCleanup>(borrowed);
}
return ManagedValue(borrowed, CleanupHandle::invalid());
}
ManagedValue SILGenFunction::emitManagedBorrowedRValueWithCleanup(
SILValue original, SILValue borrowed, const TypeLowering &lowering) {
assert(lowering.getLoweredType().getObjectType() ==
original->getType().getObjectType());
if (lowering.isTrivial())
return ManagedValue::forUnmanaged(borrowed);
if (original->getType().isObject() &&
original.getOwnershipKind() == OwnershipKind::None)
return ManagedValue::forUnmanaged(borrowed);
if (borrowed->getType().isObject()) {
Cleanups.pushCleanup<EndBorrowCleanup>(borrowed);
}
return ManagedValue(borrowed, CleanupHandle::invalid());
}
ManagedValue SILGenFunction::emitManagedRValueWithCleanup(SILValue v) {
auto &lowering = getTypeLowering(v->getType());
return emitManagedRValueWithCleanup(v, lowering);
}
ManagedValue SILGenFunction::emitManagedRValueWithCleanup(SILValue v,
const TypeLowering &lowering) {
assert(lowering.getLoweredType().getObjectType() ==
v->getType().getObjectType());
if (lowering.isTrivial())
return ManagedValue::forUnmanaged(v);
if (v->getType().isObject() && v.getOwnershipKind() == OwnershipKind::None) {
return ManagedValue::forUnmanaged(v);
}
return ManagedValue(v, enterDestroyCleanup(v));
}
ManagedValue SILGenFunction::emitManagedBufferWithCleanup(SILValue v) {
auto &lowering = getTypeLowering(v->getType());
return emitManagedBufferWithCleanup(v, lowering);
}
ManagedValue SILGenFunction::emitManagedBufferWithCleanup(SILValue v,
const TypeLowering &lowering) {
assert(lowering.getLoweredType().getAddressType() == v->getType() ||
!silConv.useLoweredAddresses());
if (lowering.isTrivial())
return ManagedValue::forUnmanaged(v);
return ManagedValue(v, enterDestroyCleanup(v));
}
void SILGenFunction::emitExprInto(Expr *E, Initialization *I,
Optional<SILLocation> L) {
// Handle the special case of copying an lvalue.
if (auto load = dyn_cast<LoadExpr>(E)) {
FormalEvaluationScope writeback(*this);
auto lv = emitLValue(load->getSubExpr(),
SGFAccessKind::BorrowedAddressRead);
emitCopyLValueInto(E, std::move(lv), I);
return;
}
RValue result = emitRValue(E, SGFContext(I));
if (result.isInContext())
return;
std::move(result).ensurePlusOne(*this, E).forwardInto(*this, L ? *L : E, I);
}
namespace {
class RValueEmitter
: public Lowering::ExprVisitor<RValueEmitter, RValue, SGFContext>
{
typedef Lowering::ExprVisitor<RValueEmitter,RValue,SGFContext> super;
public:
SILGenFunction &SGF;
RValueEmitter(SILGenFunction &SGF) : SGF(SGF) {}
using super::visit;
RValue visit(Expr *E) {
assert(!E->getType()->is<LValueType>() &&
!E->getType()->is<InOutType>() &&
"RValueEmitter shouldn't be called on lvalues");
return visit(E, SGFContext());
}
// These always produce lvalues.
RValue visitInOutExpr(InOutExpr *E, SGFContext C) {
LValue lv = SGF.emitLValue(E->getSubExpr(), SGFAccessKind::ReadWrite);
return RValue(SGF, E, SGF.emitAddressOfLValue(E->getSubExpr(),
std::move(lv)));
}
RValue visitApplyExpr(ApplyExpr *E, SGFContext C);
RValue visitDiscardAssignmentExpr(DiscardAssignmentExpr *E, SGFContext C) {
llvm_unreachable("cannot appear in rvalue");
}
RValue visitDeclRefExpr(DeclRefExpr *E, SGFContext C);
RValue visitTypeExpr(TypeExpr *E, SGFContext C);
RValue visitSuperRefExpr(SuperRefExpr *E, SGFContext C);
RValue visitOtherConstructorDeclRefExpr(OtherConstructorDeclRefExpr *E,
SGFContext C);
RValue visitForceTryExpr(ForceTryExpr *E, SGFContext C);
RValue visitOptionalTryExpr(OptionalTryExpr *E, SGFContext C);
RValue visitNilLiteralExpr(NilLiteralExpr *E, SGFContext C);
RValue visitIntegerLiteralExpr(IntegerLiteralExpr *E, SGFContext C);
RValue visitFloatLiteralExpr(FloatLiteralExpr *E, SGFContext C);
RValue visitBooleanLiteralExpr(BooleanLiteralExpr *E, SGFContext C);
RValue visitStringLiteralExpr(StringLiteralExpr *E, SGFContext C);
RValue visitLoadExpr(LoadExpr *E, SGFContext C);
RValue visitDerivedToBaseExpr(DerivedToBaseExpr *E, SGFContext C);
RValue visitMetatypeConversionExpr(MetatypeConversionExpr *E,
SGFContext C);
RValue visitCollectionUpcastConversionExpr(
CollectionUpcastConversionExpr *E,
SGFContext C);
RValue visitBridgeToObjCExpr(BridgeToObjCExpr *E, SGFContext C);
RValue visitReifyPackExpr(ReifyPackExpr *E, SGFContext C);
RValue visitBridgeFromObjCExpr(BridgeFromObjCExpr *E, SGFContext C);
RValue visitConditionalBridgeFromObjCExpr(ConditionalBridgeFromObjCExpr *E,
SGFContext C);
RValue visitArchetypeToSuperExpr(ArchetypeToSuperExpr *E, SGFContext C);
RValue visitUnresolvedTypeConversionExpr(UnresolvedTypeConversionExpr *E,
SGFContext C);
RValue visitFunctionConversionExpr(FunctionConversionExpr *E,
SGFContext C);
RValue visitCovariantFunctionConversionExpr(
CovariantFunctionConversionExpr *E,
SGFContext C);
RValue visitCovariantReturnConversionExpr(
CovariantReturnConversionExpr *E,
SGFContext C);
RValue visitErasureExpr(ErasureExpr *E, SGFContext C);
RValue visitAnyHashableErasureExpr(AnyHashableErasureExpr *E, SGFContext C);
RValue visitForcedCheckedCastExpr(ForcedCheckedCastExpr *E,
SGFContext C);
RValue visitConditionalCheckedCastExpr(ConditionalCheckedCastExpr *E,
SGFContext C);
RValue visitIsExpr(IsExpr *E, SGFContext C);
RValue visitCoerceExpr(CoerceExpr *E, SGFContext C);
RValue visitUnderlyingToOpaqueExpr(UnderlyingToOpaqueExpr *E, SGFContext C);
RValue visitTupleExpr(TupleExpr *E, SGFContext C);
RValue visitPackExpr(PackExpr *E, SGFContext C);
RValue visitMemberRefExpr(MemberRefExpr *E, SGFContext C);
RValue visitDynamicMemberRefExpr(DynamicMemberRefExpr *E, SGFContext C);
RValue visitDotSyntaxBaseIgnoredExpr(DotSyntaxBaseIgnoredExpr *E,
SGFContext C);
RValue visitTupleElementExpr(TupleElementExpr *E, SGFContext C);
RValue visitSubscriptExpr(SubscriptExpr *E, SGFContext C);
RValue visitKeyPathApplicationExpr(KeyPathApplicationExpr *E, SGFContext C);
RValue visitDynamicSubscriptExpr(DynamicSubscriptExpr *E,
SGFContext C);
RValue visitDestructureTupleExpr(DestructureTupleExpr *E, SGFContext C);
RValue visitDynamicTypeExpr(DynamicTypeExpr *E, SGFContext C);
RValue visitCaptureListExpr(CaptureListExpr *E, SGFContext C);
RValue visitAbstractClosureExpr(AbstractClosureExpr *E, SGFContext C);
RValue visitInterpolatedStringLiteralExpr(InterpolatedStringLiteralExpr *E,
SGFContext C);
RValue visitRegexLiteralExpr(RegexLiteralExpr *E, SGFContext C);
RValue visitObjectLiteralExpr(ObjectLiteralExpr *E, SGFContext C);
RValue visitEditorPlaceholderExpr(EditorPlaceholderExpr *E, SGFContext C);
RValue visitObjCSelectorExpr(ObjCSelectorExpr *E, SGFContext C);
RValue visitKeyPathExpr(KeyPathExpr *E, SGFContext C);
RValue visitMagicIdentifierLiteralExpr(MagicIdentifierLiteralExpr *E,
SGFContext C);
RValue visitCollectionExpr(CollectionExpr *E, SGFContext C);
RValue visitRebindSelfInConstructorExpr(RebindSelfInConstructorExpr *E,
SGFContext C);
RValue visitInjectIntoOptionalExpr(InjectIntoOptionalExpr *E, SGFContext C);
RValue visitClassMetatypeToObjectExpr(ClassMetatypeToObjectExpr *E,
SGFContext C);
RValue visitExistentialMetatypeToObjectExpr(ExistentialMetatypeToObjectExpr *E,
SGFContext C);
RValue visitProtocolMetatypeToObjectExpr(ProtocolMetatypeToObjectExpr *E,
SGFContext C);
RValue visitIfExpr(IfExpr *E, SGFContext C);
RValue visitAssignExpr(AssignExpr *E, SGFContext C);
RValue visitEnumIsCaseExpr(EnumIsCaseExpr *E, SGFContext C);
RValue visitBindOptionalExpr(BindOptionalExpr *E, SGFContext C);
RValue visitOptionalEvaluationExpr(OptionalEvaluationExpr *E,
SGFContext C);
RValue visitForceValueExpr(ForceValueExpr *E, SGFContext C);
RValue emitForceValue(ForceValueExpr *loc, Expr *E,
unsigned numOptionalEvaluations,
SGFContext C);
RValue visitOpenExistentialExpr(OpenExistentialExpr *E, SGFContext C);
RValue visitMakeTemporarilyEscapableExpr(
MakeTemporarilyEscapableExpr *E, SGFContext C);
RValue visitOpaqueValueExpr(OpaqueValueExpr *E, SGFContext C);
RValue visitPropertyWrapperValuePlaceholderExpr(
PropertyWrapperValuePlaceholderExpr *E, SGFContext C);
RValue visitAppliedPropertyWrapperExpr(
AppliedPropertyWrapperExpr *E, SGFContext C);
RValue visitInOutToPointerExpr(InOutToPointerExpr *E, SGFContext C);
RValue visitArrayToPointerExpr(ArrayToPointerExpr *E, SGFContext C);
RValue visitStringToPointerExpr(StringToPointerExpr *E, SGFContext C);
RValue visitPointerToPointerExpr(PointerToPointerExpr *E, SGFContext C);
RValue visitForeignObjectConversionExpr(ForeignObjectConversionExpr *E,
SGFContext C);
RValue visitUnevaluatedInstanceExpr(UnevaluatedInstanceExpr *E,
SGFContext C);
RValue visitTapExpr(TapExpr *E, SGFContext C);
RValue visitDefaultArgumentExpr(DefaultArgumentExpr *E, SGFContext C);
RValue visitErrorExpr(ErrorExpr *E, SGFContext C);
RValue visitDifferentiableFunctionExpr(DifferentiableFunctionExpr *E,
SGFContext C);
RValue visitLinearFunctionExpr(LinearFunctionExpr *E, SGFContext C);
RValue visitDifferentiableFunctionExtractOriginalExpr(
DifferentiableFunctionExtractOriginalExpr *E, SGFContext C);
RValue visitLinearFunctionExtractOriginalExpr(
LinearFunctionExtractOriginalExpr *E, SGFContext C);
RValue visitLinearToDifferentiableFunctionExpr(
LinearToDifferentiableFunctionExpr *E, SGFContext C);
};
} // end anonymous namespace
namespace {
struct BridgingConversion {
Expr *SubExpr;
Optional<Conversion::KindTy> Kind;
unsigned MaxOptionalDepth;
BridgingConversion() : SubExpr(nullptr) {}
BridgingConversion(Expr *sub, Optional<Conversion::KindTy> kind,
unsigned depth)
: SubExpr(sub), Kind(kind), MaxOptionalDepth(depth) {
assert(!kind || Conversion::isBridgingKind(*kind));
}
explicit operator bool() const { return SubExpr != nullptr; }
};
}
static BridgingConversion getBridgingConversion(Expr *E) {
E = E->getSemanticsProvidingExpr();
// Detect bridging conversions.
if (auto bridge = dyn_cast<BridgeToObjCExpr>(E)) {
return { bridge->getSubExpr(), Conversion::BridgeToObjC, 0 };
}
if (auto bridge = dyn_cast<BridgeFromObjCExpr>(E)) {
return { bridge->getSubExpr(), Conversion::BridgeFromObjC, 0 };
}
// We can handle optional injections.
if (auto inject = dyn_cast<InjectIntoOptionalExpr>(E)) {
return getBridgingConversion(inject->getSubExpr());
}
// Look through optional-to-optional conversions.
if (auto optEval = dyn_cast<OptionalEvaluationExpr>(E)) {
auto sub = optEval->getSubExpr()->getSemanticsProvidingExpr();
if (auto subResult = getBridgingConversion(sub)) {
sub = subResult.SubExpr->getSemanticsProvidingExpr();
if (auto bind = dyn_cast<BindOptionalExpr>(sub)) {
if (bind->getDepth() == subResult.MaxOptionalDepth) {
return { bind->getSubExpr(),
subResult.Kind,
subResult.MaxOptionalDepth + 1 };
}
}
}
}
// Open-existentials can be part of bridging conversions in very
// specific patterns.
auto open = dyn_cast<OpenExistentialExpr>(E);
if (open) E = open->getSubExpr();
// Existential erasure.
if (auto erasure = dyn_cast<ErasureExpr>(E)) {
Conversion::KindTy kind;
// Converting to Any is sometimes part of bridging and definitely
// needs special peepholing behavior.
if (erasure->getType()->isAny()) {
kind = Conversion::AnyErasure;
// Otherwise, nope.
} else {
return {};
}
// Tentatively look through the erasure.
E = erasure->getSubExpr();
// If we have an opening, we can only peephole if the value being
// used is exactly the original value.
if (open) {
if (E == open->getOpaqueValue()) {
return { open->getExistentialValue(), kind, 0 };
}
return {};
}
// Otherwise we can always peephole.
return { E, kind, 0 };
}
// If we peeked through an opening, and we didn't recognize a specific
// pattern above involving the opaque value, make sure we use the opening
// as the final expression instead of accidentally look through it.
if (open) return { open, None, 0 };
return { E, None, 0 };
}
/// If the given expression represents a bridging conversion, emit it with
/// the special reabstracting context.
static Optional<ManagedValue>
tryEmitAsBridgingConversion(SILGenFunction &SGF, Expr *E, bool isExplicit,
SGFContext C) {
// Try to pattern-match a conversion. This can find bridging
// conversions, but it can also find simple optional conversions:
// injections and opt-to-opt conversions.
auto result = getBridgingConversion(E);
// If we didn't find a conversion at all, there's nothing special to do.
if (!result ||
result.SubExpr == E ||
result.SubExpr->getType()->isEqual(E->getType()))
return None;
// Even if the conversion doesn't involve bridging, we might still
// expose more peephole opportunities by combining it with a contextual
// conversion.
if (!result.Kind) {
// Only do this if the conversion is implicit.
if (isExplicit)
return None;
// Look for a contextual conversion.
auto conversion = C.getAsConversion();
if (!conversion)
return None;
// Adjust the contextual conversion.
auto sub = result.SubExpr;
auto sourceType = sub->getType()->getCanonicalType();
if (auto adjusted = conversion->getConversion()
.adjustForInitialOptionalConversions(sourceType)) {
// Emit into the applied conversion.
return conversion->emitWithAdjustedConversion(SGF, E, *adjusted,
[sub](SILGenFunction &SGF, SILLocation loc, SGFContext C) {
return SGF.emitRValueAsSingleValue(sub, C);
});
}
// If that didn't work, there's nothing special to do.
return None;
}
auto kind = *result.Kind;
auto subExpr = result.SubExpr;
CanType resultType = E->getType()->getCanonicalType();
Conversion conversion =
Conversion::getBridging(kind, subExpr->getType()->getCanonicalType(),
resultType, SGF.getLoweredType(resultType),
isExplicit);
// Only use this special pattern for AnyErasure conversions when we're
// emitting into a peephole.
if (kind == Conversion::AnyErasure) {
auto outerConversion = C.getAsConversion();
if (!outerConversion ||
!canPeepholeConversions(SGF, outerConversion->getConversion(),
conversion)) {
return None;
}
}
return SGF.emitConvertedRValue(subExpr, conversion, C);
}
RValue RValueEmitter::visitApplyExpr(ApplyExpr *E, SGFContext C) {
return SGF.emitApplyExpr(E, C);
}
SILValue SILGenFunction::emitEmptyTuple(SILLocation loc) {
return B.createTuple(
loc, getLoweredType(TupleType::getEmpty(SGM.M.getASTContext())),
ArrayRef<SILValue>());
}
namespace {
/// This is a simple cleanup class that at the end of a lexical scope consumes
/// an owned value by writing it back to memory. The user can forward this
/// cleanup to take ownership of the value and thus prevent it form being
/// written back.
struct OwnedValueWritebackCleanup final : Cleanup {
using Flags = Cleanup::Flags;
/// We store our own loc so that we can ensure that DI ignores our writeback.
SILLocation loc;
SILValue lvalueAddress;
SILValue value;
OwnedValueWritebackCleanup(SILLocation loc, SILValue lvalueAddress,
SILValue value)
: loc(loc), lvalueAddress(lvalueAddress), value(value) {}
bool getWritebackBuffer(function_ref<void(SILValue)> func) override {
func(lvalueAddress);
return true;
}
void emit(SILGenFunction &SGF, CleanupLocation l, ForUnwind_t forUnwind) override {
SILValue valueToStore = value;
SILType lvalueObjTy = lvalueAddress->getType().getObjectType();
// If we calling a super.init and thus upcasted self, when we store self
// back into the self slot, we need to perform a downcast from the upcasted
// store value to the derived type of our lvalueAddress.
if (valueToStore->getType() != lvalueObjTy) {
if (!valueToStore->getType().isExactSuperclassOf(lvalueObjTy)) {
llvm_unreachable("Invalid usage of delegate init self writeback");
}
valueToStore = SGF.B.createUncheckedRefCast(loc, valueToStore,
lvalueObjTy);
}
SGF.B.emitStoreValueOperation(loc, valueToStore, lvalueAddress,
StoreOwnershipQualifier::Init);
}
void dump(SILGenFunction &) const override {
#ifndef NDEBUG
llvm::errs() << "OwnedValueWritebackCleanup "
<< "State:" << getState() << "\n"
<< "lvalueAddress:" << lvalueAddress << "value:" << value
<< "\n";
#endif
}
};
} // end anonymous namespace
CleanupHandle SILGenFunction::enterOwnedValueWritebackCleanup(
SILLocation loc, SILValue address, SILValue newValue) {
Cleanups.pushCleanup<OwnedValueWritebackCleanup>(loc, address, newValue);
return Cleanups.getTopCleanup();
}
RValue SILGenFunction::emitRValueForSelfInDelegationInit(SILLocation loc,
CanType refType,
SILValue addr,
SGFContext C) {
assert(SelfInitDelegationState != SILGenFunction::NormalSelf &&
"This should never be called unless we are in a delegation sequence");
assert(getTypeLowering(addr->getType()).isLoadable() &&
"Make sure that we are not dealing with semantic rvalues");
// If we are currently in the WillSharedBorrowSelf state, then we know that
// old self is not the self to our delegating initializer. Self in this case
// to the delegating initializer is a metatype. Thus, we perform a
// load_borrow. And move from WillSharedBorrowSelf -> DidSharedBorrowSelf.
if (SelfInitDelegationState == SILGenFunction::WillSharedBorrowSelf) {
assert(C.isGuaranteedPlusZeroOk() &&
"This should only be called if guaranteed plus zero is ok");
SelfInitDelegationState = SILGenFunction::DidSharedBorrowSelf;
ManagedValue result =
B.createLoadBorrow(loc, ManagedValue::forUnmanaged(addr));
return RValue(*this, loc, refType, result);
}
// If we are already in the did shared borrow self state, just return the
// shared borrow value.
if (SelfInitDelegationState == SILGenFunction::DidSharedBorrowSelf) {
assert(C.isGuaranteedPlusZeroOk() &&
"This should only be called if guaranteed plus zero is ok");
ManagedValue result =
B.createLoadBorrow(loc, ManagedValue::forUnmanaged(addr));
return RValue(*this, loc, refType, result);
}
// If we are in WillExclusiveBorrowSelf, then we need to perform an exclusive
// borrow (i.e. a load take) and then move to DidExclusiveBorrowSelf.
if (SelfInitDelegationState == SILGenFunction::WillExclusiveBorrowSelf) {
const auto &typeLowering = getTypeLowering(addr->getType());
SelfInitDelegationState = SILGenFunction::DidExclusiveBorrowSelf;
SILValue self =
emitLoad(loc, addr, typeLowering, C, IsTake, false).forward(*this);
// Forward our initial value for init delegation self and create a new
// cleanup that performs a writeback at the end of lexical scope if our
// value is not consumed.
InitDelegationSelf = ManagedValue::forExclusivelyBorrowedOwnedObjectRValue(
self, enterOwnedValueWritebackCleanup(*InitDelegationLoc, addr, self));
InitDelegationSelfBox = addr;
return RValue(*this, loc, refType, InitDelegationSelf);
}
// If we hit this point, we must have DidExclusiveBorrowSelf. We should have
// gone through the formal evaluation variant but did not. The only way that
// this can happen is if during argument evaluation, we are accessing self in
// a way that is illegal before we call super. Return a copy of self in this
// case so that DI will flag on this issue. We do not care where the destroy
// occurs, so we can use a normal scoped copy.
ManagedValue Result;
if (!SuperInitDelegationSelf) {
Result = InitDelegationSelf.copy(*this, loc);
} else {
Result =
B.createUncheckedRefCast(loc, SuperInitDelegationSelf.copy(*this, loc),
InitDelegationSelf.getType());
}
return RValue(*this, loc, refType, Result);
}
RValue SILGenFunction::emitFormalEvaluationRValueForSelfInDelegationInit(
SILLocation loc, CanType refType, SILValue addr, SGFContext C) {
assert(SelfInitDelegationState != SILGenFunction::NormalSelf &&
"This should never be called unless we are in a delegation sequence");
assert(getTypeLowering(addr->getType()).isLoadable() &&
"Make sure that we are not dealing with semantic rvalues");
// If we are currently in the WillSharedBorrowSelf state, then we know that
// old self is not the self to our delegating initializer. Self in this case
// to the delegating initializer is a metatype. Thus, we perform a
// load_borrow. And move from WillSharedBorrowSelf -> DidSharedBorrowSelf.
if (SelfInitDelegationState == SILGenFunction::WillSharedBorrowSelf) {
assert(C.isGuaranteedPlusZeroOk() &&
"This should only be called if guaranteed plus zero is ok");
SelfInitDelegationState = SILGenFunction::DidSharedBorrowSelf;
ManagedValue result =
B.createFormalAccessLoadBorrow(loc, ManagedValue::forUnmanaged(addr));
return RValue(*this, loc, refType, result);
}
// If we are already in the did shared borrow self state, just return the
// shared borrow value.
if (SelfInitDelegationState == SILGenFunction::DidSharedBorrowSelf) {
assert(C.isGuaranteedPlusZeroOk() &&
"This should only be called if guaranteed plus zero is ok");
ManagedValue result =
B.createFormalAccessLoadBorrow(loc, ManagedValue::forUnmanaged(addr));
return RValue(*this, loc, refType, result);
}
// If we hit this point, we must have DidExclusiveBorrowSelf. Thus borrow
// self.
//
// *NOTE* This routine should /never/ begin an exclusive borrow of self. It is
// only called when emitting self as a base in lvalue emission.
assert(SelfInitDelegationState == SILGenFunction::DidExclusiveBorrowSelf);
// If we do not have a super init delegation self, just perform a formal
// access borrow and return. This occurs with delegating initializers.
if (!SuperInitDelegationSelf) {
return RValue(*this, loc, refType,
InitDelegationSelf.formalAccessBorrow(*this, loc));
}
// Otherwise, we had an upcast of some sort due to a chaining
// initializer. This means that we need to perform a borrow from
// SuperInitDelegationSelf and then downcast that borrow.
ManagedValue borrowedUpcast =
SuperInitDelegationSelf.formalAccessBorrow(*this, loc);
ManagedValue castedBorrowedType = B.createUncheckedRefCast(
loc, borrowedUpcast, InitDelegationSelf.getType());
return RValue(*this, loc, refType, castedBorrowedType);
}
RValue SILGenFunction::
emitRValueForDecl(SILLocation loc, ConcreteDeclRef declRef, Type ncRefType,
AccessSemantics semantics, SGFContext C) {
assert(!ncRefType->is<LValueType>() &&
"RValueEmitter shouldn't be called on lvalues");
// If this is a decl that we have an lvalue for, produce and return it.
ValueDecl *decl = declRef.getDecl();
CanType refType = ncRefType->getCanonicalType();
// If this is a reference to a module, produce an undef value. The
// module value should never actually be used.
if (isa<ModuleDecl>(decl)) {
return emitUndefRValue(loc, refType);
}
// If this is a reference to a var, emit it as an l-value and then load.
if (auto *var = dyn_cast<VarDecl>(decl))
return emitRValueForNonMemberVarDecl(loc, declRef, refType, semantics, C);
assert(!isa<TypeDecl>(decl));
// If the referenced decl isn't a VarDecl, it should be a constant of some
// sort.
SILDeclRef silDeclRef(decl);
assert(silDeclRef.getParameterListCount() == 1);
ManagedValue result = emitClosureValue(loc, silDeclRef, refType,
declRef.getSubstitutions(),
/*already converted*/ false);
return RValue(*this, loc, refType, result);
}
RValue RValueEmitter::visitDeclRefExpr(DeclRefExpr *E, SGFContext C) {
return SGF.emitRValueForDecl(E, E->getDeclRef(), E->getType(),
E->getAccessSemantics(), C);
}
RValue RValueEmitter::visitTypeExpr(TypeExpr *E, SGFContext C) {
assert(E->getType()->is<AnyMetatypeType>() &&
"TypeExpr must have metatype type");
auto Val = SGF.B.createMetatype(E, SGF.getLoweredType(E->getType()));
return RValue(SGF, E, ManagedValue::forUnmanaged(Val));
}
RValue RValueEmitter::visitSuperRefExpr(SuperRefExpr *E, SGFContext C) {
assert(!E->getType()->is<LValueType>() &&
"RValueEmitter shouldn't be called on lvalues");
// If we have a normal self call, then use the emitRValueForDecl call. This
// will emit self at +0 since it is guaranteed.
ManagedValue Self =
SGF.emitRValueForDecl(E, E->getSelf(), E->getSelf()->getType(),
AccessSemantics::Ordinary)
.getScalarValue();
// Perform an upcast to convert self to the indicated super type.
auto result = SGF.B.createUpcast(E, Self, SGF.getLoweredType(E->getType()));
return RValue(SGF, E, result);
}
RValue RValueEmitter::
visitUnresolvedTypeConversionExpr(UnresolvedTypeConversionExpr *E,
SGFContext C) {
llvm_unreachable("invalid code made its way into SILGen");
}
RValue RValueEmitter::visitOtherConstructorDeclRefExpr(
OtherConstructorDeclRefExpr *E, SGFContext C) {
// This should always be a child of an ApplyExpr and so will be emitted by
// SILGenApply.
llvm_unreachable("unapplied reference to constructor?!");
}
RValue RValueEmitter::visitNilLiteralExpr(NilLiteralExpr *E, SGFContext C) {
// Peephole away the call to Optional<T>(nilLiteral: ()).
if (E->getType()->getOptionalObjectType()) {
auto *noneDecl = SGF.getASTContext().getOptionalNoneDecl();
auto enumTy = SGF.getLoweredType(E->getType());
ManagedValue noneValue;
if (enumTy.isLoadable(SGF.F) || !SGF.silConv.useLoweredAddresses()) {
noneValue = ManagedValue::forUnmanaged(
SGF.B.createEnum(E, SILValue(), noneDecl, enumTy));
} else {
noneValue =
SGF.B.bufferForExpr(E, enumTy, SGF.getTypeLowering(enumTy), C,
[&](SILValue newAddr) {
SGF.B.createInjectEnumAddr(E, newAddr, noneDecl);
});
}
return RValue(SGF, E, noneValue);
}
return SGF.emitLiteral(E, C);
}
RValue RValueEmitter::visitIntegerLiteralExpr(IntegerLiteralExpr *E,
SGFContext C) {
if (E->getType()->is<AnyBuiltinIntegerType>())
return RValue(SGF, E,
ManagedValue::forUnmanaged(SGF.B.createIntegerLiteral(E)));
return SGF.emitLiteral(E, C);
}
RValue RValueEmitter::visitFloatLiteralExpr(FloatLiteralExpr *E,