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fuchsia / third_party / swift / refs/heads/upstream/holiday-patches / . / lib / SILGen / SILGenApply.cpp
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//===--- SILGenApply.cpp - Constructs call sites for SILGen ---------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 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 "Conversion.h"
#include "FormalEvaluation.h"
#include "Initialization.h"
#include "LValue.h"
#include "RValue.h"
#include "ResultPlan.h"
#include "Scope.h"
#include "SpecializedEmitter.h"
#include "Varargs.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/DiagnosticsSIL.h"
#include "swift/AST/ForeignAsyncConvention.h"
#include "swift/AST/ForeignErrorConvention.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/GenericSignature.h"
#include "swift/AST/Module.h"
#include "swift/AST/ModuleLoader.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/SubstitutionMap.h"
#include "swift/Basic/ExternalUnion.h"
#include "swift/Basic/Range.h"
#include "swift/Basic/STLExtras.h"
#include "swift/Basic/Unicode.h"
#include "swift/SIL/PrettyStackTrace.h"
#include "swift/SIL/SILArgument.h"
#include "clang/AST/DeclCXX.h"
#include "llvm/Support/Compiler.h"
#include "clang/AST/DeclObjC.h"
using namespace swift;
using namespace Lowering;
//===----------------------------------------------------------------------===//
// Utility Functions
//===----------------------------------------------------------------------===//
SubstitutionMap SILGenModule::mapSubstitutionsForWitnessOverride(
AbstractFunctionDecl *original,
AbstractFunctionDecl *overridden,
SubstitutionMap subs) {
// Substitute the 'Self' type of the base protocol.
auto origProto = cast<ProtocolDecl>(original->getDeclContext());
Type origProtoSelfType = origProto->getSelfInterfaceType();
auto baseProto = cast<ProtocolDecl>(overridden->getDeclContext());
return SubstitutionMap::getProtocolSubstitutions(
baseProto, origProtoSelfType.subst(subs),
subs.lookupConformance(origProtoSelfType->getCanonicalType(), baseProto));
}
/// Return the abstraction pattern to use when calling a function value.
static AbstractionPattern
getIndirectApplyAbstractionPattern(SILGenFunction &SGF,
CanFunctionType fnType) {
assert(fnType);
AbstractionPattern pattern(fnType);
switch (fnType->getRepresentation()) {
case FunctionTypeRepresentation::Swift:
case FunctionTypeRepresentation::Thin:
return pattern;
case FunctionTypeRepresentation::CFunctionPointer:
case FunctionTypeRepresentation::Block: {
// C and block function parameters and results are implicitly
// bridged to a foreign type.
auto silRep =
SILFunctionTypeRepresentation(fnType->getExtInfo().getRepresentation());
auto bridgedType = SGF.SGM.Types.getBridgedFunctionType(
pattern, fnType, Bridgeability::Full, silRep);
pattern.rewriteType(CanGenericSignature(), bridgedType);
return pattern;
}
}
llvm_unreachable("bad representation");
}
/// Return the formal type for the partial-apply result type of a
/// dynamic method invocation.
static CanFunctionType
getPartialApplyOfDynamicMethodFormalType(SILGenModule &SGM, SILDeclRef member,
ConcreteDeclRef memberRef) {
auto memberCI =
SGM.Types.getConstantInfo(TypeExpansionContext::minimal(), member);
// Construct a non-generic version of the formal type.
// This works because we're only using foreign members, where presumably
// substitution doesn't matter.
CanAnyFunctionType completeMethodTy = memberCI.LoweredType;
if (auto genericFnType = dyn_cast<GenericFunctionType>(completeMethodTy)) {
completeMethodTy = cast<FunctionType>(
genericFnType->substGenericArgs(memberRef.getSubstitutions())
->getCanonicalType());
}
// Adjust the parameters by removing the self parameter, which we
// will be partially applying.
auto params = completeMethodTy.getParams().drop_back();
// Adjust the result type to replace dynamic-self with AnyObject.
CanType resultType = completeMethodTy.getResult();
if (auto fnDecl = dyn_cast<FuncDecl>(member.getDecl())) {
if (fnDecl->hasDynamicSelfResult()) {
auto anyObjectTy = SGM.getASTContext().getAnyObjectType();
resultType = resultType->replaceCovariantResultType(anyObjectTy, 0)
->getCanonicalType();
}
}
// Adjust the ExtInfo by using a Swift representation.
auto extInfo = completeMethodTy->getExtInfo()
.withRepresentation(FunctionTypeRepresentation::Swift);
auto fnType = CanFunctionType::get(params, resultType, extInfo);
return fnType;
}
/// Retrieve the type to use for a method found via dynamic lookup.
static SILType
getDynamicMethodLoweredType(SILModule &M,
SILDeclRef constant,
CanAnyFunctionType substMemberTy) {
assert(constant.isForeign);
auto objcFormalTy = substMemberTy.withExtInfo(
substMemberTy->getExtInfo()
.intoBuilder()
.withSILRepresentation(SILFunctionTypeRepresentation::ObjCMethod)
.build());
return SILType::getPrimitiveObjectType(
M.Types.getUncachedSILFunctionTypeForConstant(
TypeExpansionContext::minimal(), constant, objcFormalTy));
}
/// Check if we can perform a dynamic dispatch on a super method call.
static bool canUseStaticDispatch(SILGenFunction &SGF,
SILDeclRef constant) {
auto *funcDecl = cast<AbstractFunctionDecl>(constant.getDecl());
if (funcDecl->isFinal())
return true;
// Native initializing entry points are always statically dispatched.
if (constant.kind == SILDeclRef::Kind::Initializer
&& !constant.isForeign)
return true;
// Extension methods currently must be statically dispatched, unless they're
// @objc or dynamic.
if (isa<ExtensionDecl>(funcDecl->getDeclContext()) && !constant.isForeign)
return true;
// We cannot form a direct reference to a method body defined in
// Objective-C.
if (constant.isForeign)
return false;
// If we cannot form a direct reference due to resilience constraints,
// we have to dynamic dispatch.
if (SGF.F.isSerialized())
return false;
// If the method is defined in the same module, we can reference it
// directly.
auto thisModule = SGF.SGM.M.getSwiftModule();
if (thisModule == funcDecl->getModuleContext())
return true;
// Otherwise, we must dynamic dispatch.
return false;
}
static SILValue getOriginalSelfValue(SILValue selfValue) {
if (auto *TTOI = dyn_cast<ThickToObjCMetatypeInst>(selfValue))
selfValue = TTOI->getOperand();
if (auto *BBI = dyn_cast<BeginBorrowInst>(selfValue))
selfValue = BBI->getOperand();
while (auto *UI = dyn_cast<UpcastInst>(selfValue))
selfValue = UI->getOperand();
if (auto *UTBCI = dyn_cast<UncheckedTrivialBitCastInst>(selfValue))
selfValue = UTBCI->getOperand();
return selfValue;
}
/// Borrow self and then upcast self to its original type. If self is a
/// metatype, we just return the original metatype since metatypes are trivial.
static ManagedValue borrowedCastToOriginalSelfType(SILGenFunction &SGF,
SILLocation loc,
ManagedValue self) {
SILValue originalSelf = getOriginalSelfValue(self.getValue());
SILType originalSelfType = originalSelf->getType();
// If we have a metatype, then we just return the original self value since
// metatypes are trivial, so we can avoid ownership concerns.
if (originalSelfType.is<AnyMetatypeType>()) {
assert(originalSelfType.isTrivial(SGF.F) &&
"Metatypes should always be trivial");
return ManagedValue::forUnmanaged(originalSelf);
}
// Otherwise, we have a non-metatype. Use a borrow+unchecked_ref_cast.
return SGF.B.createUncheckedRefCast(loc, self.formalAccessBorrow(SGF, loc),
originalSelfType);
}
static ManagedValue convertOwnershipConventionGivenParamInfo(
SILGenFunction &SGF, SILParameterInfo param, ManagedValue value,
SILLocation loc, bool isForCoroutine) {
if (param.isConsumed() &&
value.getOwnershipKind() == OwnershipKind::Guaranteed) {
return value.copyUnmanaged(SGF, loc);
}
// If we are emitting arguments for a coroutine, we need to borrow owned
// values to ensure that they are live over the entire closure invocation. If
// we do not have a coroutine, then we have an immediate non-consuming use so
// no borrow is necessary.
if (isForCoroutine && value.getOwnershipKind() == OwnershipKind::Owned) {
if (param.isDirectGuaranteed() || (!SGF.silConv.useLoweredAddresses() &&
param.isIndirectInGuaranteed())) {
return value.formalAccessBorrow(SGF, loc);
}
}
return value;
}
static void convertOwnershipConventionsGivenParamInfos(
SILGenFunction &SGF, ArrayRef<SILParameterInfo> params,
ArrayRef<ManagedValue> values, SILLocation loc, bool isForCoroutine,
llvm::SmallVectorImpl<ManagedValue> &outVar) {
assert(params.size() == values.size() &&
"Different number of params from arguments");
llvm::transform(indices(params), std::back_inserter(outVar),
[&](unsigned i) -> ManagedValue {
return convertOwnershipConventionGivenParamInfo(
SGF, params[i], values[i], loc, isForCoroutine);
});
}
//===----------------------------------------------------------------------===//
// Callee
//===----------------------------------------------------------------------===//
namespace {
/// Abstractly represents a callee, which may be a constant or function value,
/// and knows how to perform dynamic dispatch and reference the appropriate
/// entry point at any valid uncurry level.
class Callee {
public:
enum class Kind {
/// An indirect function value.
IndirectValue,
/// A direct standalone function call, referenceable by a FunctionRefInst.
StandaloneFunction,
/// A direct standalone function call, referenceable by a
/// PreviousDynamicFunctionRefInst.
StandaloneFunctionDynamicallyReplaceableImpl,
/// Enum case constructor call.
EnumElement,
/// A method call using class method dispatch.
ClassMethod,
/// A method call using super method dispatch.
SuperMethod,
/// A method call using protocol witness table dispatch.
WitnessMethod,
/// A method call using dynamic lookup.
DynamicMethod,
};
Kind kind;
// Move, don't copy.
Callee(const Callee &) = delete;
Callee &operator=(const Callee &) = delete;
private:
/// An IndirectValue callee represents something like a swift closure or a c
/// function pointer where we have /no/ information at all on what the callee
/// is. This contrasts with a class method, where we may not know the exact
/// method that is being called, but we have some information from the type
/// system that we have an actual method.
///
/// *NOTE* This will never be non-null if Constant is non-null.
ManagedValue IndirectValue;
/// If we are trying to call a specific method or function, this field is set
/// to the decl ref information for that callee.
///
/// *NOTE* This should never be non-null if IndirectValue is non-null.
SILDeclRef Constant;
/// The abstraction pattern of the callee.
AbstractionPattern OrigFormalInterfaceType;
/// The callee's formal type with substitutions applied.
CanFunctionType SubstFormalInterfaceType;
/// The substitutions applied to OrigFormalInterfaceType to produce
/// SubstFormalInterfaceType, substituted into the current type expansion
/// context.
SubstitutionMap Substitutions;
/// The list of values captured by our callee.
Optional<SmallVector<ManagedValue, 2>> Captures;
// The pointer back to the AST node that produced the callee.
SILLocation Loc;
static CanFunctionType
getSubstFormalInterfaceType(CanAnyFunctionType substFormalType,
SubstitutionMap subs) {
if (auto *gft = substFormalType->getAs<GenericFunctionType>()) {
return cast<FunctionType>(
gft->substGenericArgs(subs)
->getCanonicalType());
}
return cast<FunctionType>(substFormalType);
}
/// Constructor for Callee::forIndirect.
Callee(ManagedValue indirectValue,
AbstractionPattern origFormalType,
CanFunctionType substFormalType,
SILLocation l)
: kind(Kind::IndirectValue),
IndirectValue(indirectValue),
OrigFormalInterfaceType(origFormalType),
SubstFormalInterfaceType(substFormalType),
Loc(l)
{}
/// Constructor for Callee::forDirect.
Callee(SILGenFunction &SGF, SILDeclRef standaloneFunction,
AbstractionPattern origFormalType, CanAnyFunctionType substFormalType,
SubstitutionMap subs, SubstitutionMap formalSubs, SILLocation l,
bool callDynamicallyReplaceableImpl = false)
: kind(callDynamicallyReplaceableImpl
? Kind::StandaloneFunctionDynamicallyReplaceableImpl
: Kind::StandaloneFunction),
Constant(standaloneFunction), OrigFormalInterfaceType(origFormalType),
SubstFormalInterfaceType(
getSubstFormalInterfaceType(substFormalType, formalSubs)),
Substitutions(subs), Loc(l) {}
/// Constructor called by all for* factory methods except forDirect and
/// forIndirect.
Callee(Kind methodKind, SILGenFunction &SGF, SILDeclRef methodName,
AbstractionPattern origFormalType, CanAnyFunctionType substFormalType,
SubstitutionMap subs, SILLocation l)
: kind(methodKind), Constant(methodName),
OrigFormalInterfaceType(origFormalType),
SubstFormalInterfaceType(
getSubstFormalInterfaceType(substFormalType, subs)),
Substitutions(subs), Loc(l) {}
public:
static Callee forIndirect(ManagedValue indirectValue,
AbstractionPattern origFormalType,
CanFunctionType substFormalType,
SILLocation l) {
return Callee(indirectValue, origFormalType, substFormalType, l);
}
static Callee forDirect(SILGenFunction &SGF, SILDeclRef c,
SubstitutionMap subs,
SILLocation l,
bool callPreviousDynamicReplaceableImpl = false) {
auto &ci = SGF.getConstantInfo(SGF.getTypeExpansionContext(), c);
return Callee(
SGF, c, ci.FormalPattern, ci.FormalType,
subs.mapIntoTypeExpansionContext(SGF.getTypeExpansionContext()),
subs,
l,
callPreviousDynamicReplaceableImpl);
}
static Callee forEnumElement(SILGenFunction &SGF, SILDeclRef c,
SubstitutionMap subs,
SILLocation l) {
assert(isa<EnumElementDecl>(c.getDecl()));
auto &ci = SGF.getConstantInfo(SGF.getTypeExpansionContext(), c);
return Callee(
Kind::EnumElement, SGF, c, ci.FormalPattern, ci.FormalType,
subs.mapIntoTypeExpansionContext(SGF.getTypeExpansionContext()), l);
}
static Callee forClassMethod(SILGenFunction &SGF,
SILDeclRef c, SubstitutionMap subs,
SILLocation l) {
auto base = c.getOverriddenVTableEntry();
auto &baseCI = SGF.getConstantInfo(SGF.getTypeExpansionContext(), base);
auto &derivedCI = SGF.getConstantInfo(SGF.getTypeExpansionContext(), c);
return Callee(
Kind::ClassMethod, SGF, c, baseCI.FormalPattern, derivedCI.FormalType,
subs.mapIntoTypeExpansionContext(SGF.getTypeExpansionContext()), l);
}
static Callee forSuperMethod(SILGenFunction &SGF,
SILDeclRef c, SubstitutionMap subs,
SILLocation l) {
auto &ci = SGF.getConstantInfo(SGF.getTypeExpansionContext(), c);
return Callee(
Kind::SuperMethod, SGF, c, ci.FormalPattern, ci.FormalType,
subs.mapIntoTypeExpansionContext(SGF.getTypeExpansionContext()), l);
}
static Callee forWitnessMethod(SILGenFunction &SGF,
CanType protocolSelfType,
SILDeclRef c,
SubstitutionMap subs,
SILLocation l) {
// Find a witness that has an entry in the witness table.
if (!c.requiresNewWitnessTableEntry()) {
// Retrieve the constant that has an entry in the witness table.
auto original = cast<AbstractFunctionDecl>(c.getDecl());
c = c.getOverriddenWitnessTableEntry();
c = c.asForeign(c.getDecl()->isObjC());
auto overridden = cast<AbstractFunctionDecl>(c.getDecl());
// Substitute the 'Self' type of the base protocol.
subs = SILGenModule::mapSubstitutionsForWitnessOverride(original,
overridden,
subs);
}
auto &ci = SGF.getConstantInfo(SGF.getTypeExpansionContext(), c);
return Callee(
Kind::WitnessMethod, SGF, c, ci.FormalPattern, ci.FormalType,
subs.mapIntoTypeExpansionContext(SGF.getTypeExpansionContext()), l);
}
static Callee forDynamic(SILGenFunction &SGF,
SILDeclRef c, SubstitutionMap constantSubs,
CanAnyFunctionType substFormalType,
SubstitutionMap subs, SILLocation l) {
auto &ci = SGF.getConstantInfo(SGF.getTypeExpansionContext(), c);
AbstractionPattern origFormalType = ci.FormalPattern;
// Replace the original self type with the partially-applied subst type.
auto origFormalFnType = cast<AnyFunctionType>(origFormalType.getType());
if (auto genericFnType = dyn_cast<GenericFunctionType>(origFormalFnType)) {
// If we have a generic function type, substitute it. This is normally
// a huge no-no, but the partial-application hacks we're doing here
// really kindof mandate it, and it works out because we're always using
// a foreign function. If/when we support native dynamic functions,
// this will stop working and we will need a completely different
// approach.
origFormalFnType =
cast<FunctionType>(genericFnType->substGenericArgs(constantSubs)
->getCanonicalType());
}
origFormalType.rewriteType(CanGenericSignature(), origFormalFnType);
return Callee(
Kind::DynamicMethod, SGF, c, origFormalType, substFormalType,
subs.mapIntoTypeExpansionContext(SGF.getTypeExpansionContext()), l);
}
Callee(Callee &&) = default;
Callee &operator=(Callee &&) = default;
void setCaptures(SmallVectorImpl<ManagedValue> &&captures) {
Captures = std::move(captures);
}
ArrayRef<ManagedValue> getCaptures() const {
if (Captures)
return *Captures;
return {};
}
bool hasCaptures() const {
return Captures.hasValue();
}
AbstractionPattern getOrigFormalType() const {
return AbstractionPattern(OrigFormalInterfaceType);
}
CanFunctionType getSubstFormalType() const {
return SubstFormalInterfaceType;
}
unsigned getParameterListCount() const {
switch (kind) {
case Kind::IndirectValue:
return 1;
case Kind::StandaloneFunction:
case Kind::StandaloneFunctionDynamicallyReplaceableImpl:
case Kind::EnumElement:
case Kind::ClassMethod:
case Kind::SuperMethod:
case Kind::WitnessMethod:
case Kind::DynamicMethod:
return Constant.getParameterListCount();
}
llvm_unreachable("Unhandled Kind in switch.");
}
bool requiresSelfValueForDispatch() const {
switch (kind) {
case Kind::IndirectValue:
case Kind::StandaloneFunction:
case Kind::StandaloneFunctionDynamicallyReplaceableImpl:
case Kind::EnumElement:
return false;
case Kind::WitnessMethod:
if (Constant.isForeign)
return true;
return false;
case Kind::ClassMethod:
case Kind::SuperMethod:
case Kind::DynamicMethod:
return true;
}
llvm_unreachable("Unhandled Kind in switch.");
}
EnumElementDecl *getEnumElementDecl() {
assert(kind == Kind::EnumElement);
return cast<EnumElementDecl>(Constant.getDecl());
}
ValueDecl *getDecl() {
return Constant.getDecl();
}
CalleeTypeInfo createCalleeTypeInfo(SILGenFunction &SGF,
Optional<SILDeclRef> constant,
SILType formalFnType) const & {
CalleeTypeInfo result;
result.substFnType =
formalFnType.castTo<SILFunctionType>()->substGenericArgs(
SGF.SGM.M, Substitutions, SGF.getTypeExpansionContext());
if (!constant || !constant->isForeign)
return result;
auto func = cast<AbstractFunctionDecl>(constant->getDecl());
result.foreign = CalleeTypeInfo::ForeignInfo{
func->getForeignErrorConvention(),
func->getForeignAsyncConvention(),
func->getImportAsMemberStatus(),
};
// Remove the metatype "self" parameter by making this a static member.
if (constant->getDecl()->getClangDecl() &&
isa<clang::CXXConstructorDecl>(constant->getDecl()->getClangDecl()))
result.foreign.self.setStatic();
return result;
}
ManagedValue getFnValue(SILGenFunction &SGF,
Optional<ManagedValue> borrowedSelf) const & {
Optional<SILDeclRef> constant = None;
if (Constant)
constant = Constant;
switch (kind) {
case Kind::IndirectValue:
assert(Substitutions.empty());
return IndirectValue;
case Kind::EnumElement:
case Kind::StandaloneFunction: {
auto constantInfo =
SGF.getConstantInfo(SGF.getTypeExpansionContext(), *constant);
SILValue ref = SGF.emitGlobalFunctionRef(Loc, *constant, constantInfo);
return ManagedValue::forUnmanaged(ref);
}
case Kind::StandaloneFunctionDynamicallyReplaceableImpl: {
auto constantInfo =
SGF.getConstantInfo(SGF.getTypeExpansionContext(), *constant);
SILValue ref =
SGF.emitGlobalFunctionRef(Loc, *constant, constantInfo, true);
return ManagedValue::forUnmanaged(ref);
}
case Kind::ClassMethod: {
auto methodTy = SGF.SGM.Types.getConstantOverrideType(
SGF.getTypeExpansionContext(), *constant);
// Otherwise, do the dynamic dispatch inline.
ArgumentScope S(SGF, Loc);
SILValue methodVal;
if (!constant->isForeign) {
methodVal = SGF.emitClassMethodRef(
Loc, borrowedSelf->getValue(), *constant, methodTy);
} else {
methodVal = SGF.B.createObjCMethod(
Loc, borrowedSelf->getValue(), *constant,
SILType::getPrimitiveObjectType(methodTy));
}
S.pop();
return ManagedValue::forUnmanaged(methodVal);
}
case Kind::SuperMethod: {
ArgumentScope S(SGF, Loc);
ManagedValue castValue = borrowedCastToOriginalSelfType(
SGF, Loc, *borrowedSelf);
auto base = constant->getOverriddenVTableEntry();
auto constantInfo = SGF.SGM.Types.getConstantOverrideInfo(
SGF.getTypeExpansionContext(), *constant, base);
ManagedValue fn;
if (!constant->isForeign) {
fn = SGF.B.createSuperMethod(Loc, castValue, *constant,
constantInfo.getSILType());
} else {
fn = SGF.B.createObjCSuperMethod(Loc, castValue, *constant,
constantInfo.getSILType());
}
S.pop();
return fn;
}
case Kind::WitnessMethod: {
auto constantInfo =
SGF.getConstantInfo(SGF.getTypeExpansionContext(), *constant);
// TODO: substOpaqueTypesWithUnderlyingTypes ...
auto proto = cast<ProtocolDecl>(Constant.getDecl()->getDeclContext());
auto selfType = proto->getSelfInterfaceType()->getCanonicalType();
auto lookupType = selfType.subst(Substitutions)->getCanonicalType();
auto conformance = Substitutions.lookupConformance(selfType, proto);
ArgumentScope S(SGF, Loc);
SILValue fn;
if (!constant->isForeign) {
fn = SGF.B.createWitnessMethod(
Loc, lookupType, conformance, *constant,
constantInfo.getSILType());
} else {
fn = SGF.B.createObjCMethod(Loc, borrowedSelf->getValue(),
*constant, constantInfo.getSILType());
}
S.pop();
return ManagedValue::forUnmanaged(fn);
}
case Kind::DynamicMethod: {
auto closureType = getDynamicMethodLoweredType(
SGF.SGM.M, *constant, getSubstFormalType());
ArgumentScope S(SGF, Loc);
SILValue fn = SGF.B.createObjCMethod(
Loc, borrowedSelf->getValue(), *constant,
closureType);
S.pop();
return ManagedValue::forUnmanaged(fn);
}
}
llvm_unreachable("unhandled kind");
}
CalleeTypeInfo getTypeInfo(SILGenFunction &SGF) const & {
Optional<SILDeclRef> constant = None;
if (Constant)
constant = Constant;
switch (kind) {
case Kind::IndirectValue:
assert(Substitutions.empty());
return createCalleeTypeInfo(SGF, constant, IndirectValue.getType());
case Kind::StandaloneFunctionDynamicallyReplaceableImpl:
case Kind::StandaloneFunction: {
auto constantInfo =
SGF.getConstantInfo(SGF.getTypeExpansionContext(), *constant);
return createCalleeTypeInfo(SGF, constant, constantInfo.getSILType());
}
case Kind::EnumElement: {
// Emit a direct call to the element constructor thunk.
auto constantInfo =
SGF.getConstantInfo(SGF.getTypeExpansionContext(), *constant);
return createCalleeTypeInfo(SGF, constant, constantInfo.getSILType());
}
case Kind::ClassMethod: {
auto constantInfo = SGF.SGM.Types.getConstantOverrideInfo(
SGF.getTypeExpansionContext(), *constant);
return createCalleeTypeInfo(SGF, constant, constantInfo.getSILType());
}
case Kind::SuperMethod: {
auto base = constant->getOverriddenVTableEntry();
auto constantInfo = SGF.SGM.Types.getConstantOverrideInfo(
SGF.getTypeExpansionContext(), *constant, base);
return createCalleeTypeInfo(SGF, constant, constantInfo.getSILType());
}
case Kind::WitnessMethod: {
auto constantInfo =
SGF.getConstantInfo(SGF.getTypeExpansionContext(), *constant);
return createCalleeTypeInfo(SGF, constant, constantInfo.getSILType());
}
case Kind::DynamicMethod: {
auto formalType = getDynamicMethodLoweredType(
SGF.SGM.M, *constant, getSubstFormalType());
return createCalleeTypeInfo(SGF, constant, formalType);
}
}
llvm_unreachable("unhandled kind");
}
SubstitutionMap getSubstitutions() const {
return Substitutions;
}
SILDeclRef getMethodName() const {
return Constant;
}
/// Return a specialized emission function if this is a function with a known
/// lowering, such as a builtin, or return null if there is no specialized
/// emitter.
Optional<SpecializedEmitter>
getSpecializedEmitter(SILGenModule &SGM) const {
switch (kind) {
case Kind::StandaloneFunction: {
return SpecializedEmitter::forDecl(SGM, Constant);
}
case Kind::EnumElement:
case Kind::IndirectValue:
case Kind::ClassMethod:
case Kind::SuperMethod:
case Kind::WitnessMethod:
case Kind::DynamicMethod:
case Kind::StandaloneFunctionDynamicallyReplaceableImpl:
return None;
}
llvm_unreachable("bad callee kind");
}
};
} // end anonymous namespace
/// Is this a call to the dynamically replaced function inside of a
/// '@_dynamicReplacement(for:)' function.
bool isCallToReplacedInDynamicReplacement(SILGenFunction &SGF,
AbstractFunctionDecl *afd,
bool &isObjCReplacementSelfCall) {
if (auto *func =
dyn_cast_or_null<AbstractFunctionDecl>(SGF.FunctionDC->getAsDecl())) {
if (func->getDynamicallyReplacedDecl() == afd) {
isObjCReplacementSelfCall = afd->isObjC();
return true;
}
}
return false;
}
//===----------------------------------------------------------------------===//
// SILGenApply ASTVisitor
//===----------------------------------------------------------------------===//
/// For ObjC init methods, we generate a shared-linkage Swift allocating entry
/// point that does the [[T alloc] init] dance. We want to use this native
/// thunk where we expect to be calling an allocating entry point for an ObjC
/// constructor.
static bool isConstructorWithGeneratedAllocatorThunk(ValueDecl *vd) {
return vd->isObjC() && isa<ConstructorDecl>(vd);
}
namespace {
/// An ASTVisitor for decomposing a nesting of ApplyExprs into an initial
/// Callee and a list of CallSites. The CallEmission class below uses these
/// to generate the actual SIL call.
///
/// Formally, an ApplyExpr in the AST always has a single argument, which may
/// be of tuple type, possibly empty. Also, some callees have a formal type
/// which is curried -- for example, methods have type Self -> Arg -> Result.
///
/// However, SIL functions take zero or more parameters and the natural entry
/// point of a method takes Self as an additional argument, rather than
/// returning a partial application.
///
/// Therefore, nested ApplyExprs applied to a constant are flattened into a
/// single call of the most uncurried entry point fitting the call site.
/// This avoids intermediate closure construction.
///
/// For example, a method reference 'self.method' decomposes into curry thunk
/// as the callee, with a single call site '(self)'.
///
/// On the other hand, a call of a method 'self.method(x)(y)' with a function
/// return type decomposes into the method's natural entry point as the callee,
/// and two call sites, first '(x, self)' then '(y)'.
class SILGenApply : public Lowering::ExprVisitor<SILGenApply> {
public:
/// The SILGenFunction that we are emitting SIL into.
SILGenFunction &SGF;
/// The apply callee that abstractly represents the entry point that is being
/// called.
Optional<Callee> applyCallee;
/// The lvalue or rvalue representing the argument source of self.
ArgumentSource selfParam;
ApplyExpr *selfApply = nullptr;
ApplyExpr *callSite = nullptr;
Expr *sideEffect = nullptr;
SILGenApply(SILGenFunction &SGF)
: SGF(SGF)
{}
void setCallee(Callee &&c) {
assert(!applyCallee && "already set callee!");
applyCallee.emplace(std::move(c));
}
void setSideEffect(Expr *sideEffectExpr) {
assert(!sideEffect && "already set side effect!");
sideEffect = sideEffectExpr;
}
void setSelfParam(ArgumentSource &&theSelfParam) {
assert(!selfParam && "already set this!");
selfParam = std::move(theSelfParam);
}
bool isSelfApplyOfMethod(ApplyExpr *e) {
if (auto *selfApply = dyn_cast<ApplyExpr>(e->getFn())) {
if (auto *declRefExpr = dyn_cast<DeclRefExpr>(selfApply->getFn()))
return declRefExpr->getDecl()->getNumCurryLevels() == 2;
if (isa<OtherConstructorDeclRefExpr>(selfApply->getFn()))
return true;
}
return false;
}
void decompose(ApplyExpr *e) {
callSite = e;
if (isSelfApplyOfMethod(e)) {
selfApply = cast<ApplyExpr>(e->getFn());
if (selfApply->isSuper()) {
applySuper(selfApply);
return;
}
if (applyInitDelegation(selfApply))
return;
visit(selfApply->getFn());
return;
}
visit(e->getFn());
}
/// Fall back to an unknown, indirect callee.
void visitExpr(Expr *e) {
// TODO: preserve the function pointer at its original abstraction level
// when loading from memory.
ManagedValue fn = SGF.emitRValueAsSingleValue(e);
auto substType = cast<FunctionType>(e->getType()->getCanonicalType());
// When calling an C or block function, there's implicit bridging.
auto origType = getIndirectApplyAbstractionPattern(SGF, substType);
setCallee(Callee::forIndirect(fn, origType, substType, e));
}
static constexpr unsigned metatypeRepPair(MetatypeRepresentation a,
MetatypeRepresentation b) {
return assert(unsigned(a) < 256 && unsigned(b) < 256
&& "MetatypeRepresentation got too big for its britches"),
unsigned(a) << 8 | unsigned(b);
}
/// Idempotently convert a metatype to a thick or objc metatype, depending
/// on what allocation mechanism we need for a given class hierarchy.
std::pair<ManagedValue, SILType>
convertToMetatypeForAllocRefDynamic(ManagedValue selfMeta,
SILLocation loc,
bool usesObjCAllocation) {
auto givenMetatype = selfMeta.getType().castTo<AnyMetatypeType>();
CanType instanceType = givenMetatype.getInstanceType();
auto destMetatypeRep = usesObjCAllocation
? MetatypeRepresentation::ObjC
: MetatypeRepresentation::Thick;
// If we are already the right rep, just return.
auto givenMetatypeRep = givenMetatype->getRepresentation();
if (givenMetatypeRep == destMetatypeRep) {
return {selfMeta, SGF.getLoweredType(instanceType)};
}
CanAnyMetatypeType destMetatype;
if (isa<MetatypeType>(givenMetatype)) {
destMetatype =
CanMetatypeType::get(instanceType, destMetatypeRep);
} else {
destMetatype = CanExistentialMetatypeType::get(instanceType,
destMetatypeRep);
}
// Metatypes are trivial and thus do not have a cleanup. Only if we
// convert them to an object do they become non-trivial.
assert(!selfMeta.hasCleanup());
SILValue convertedValue;
switch (metatypeRepPair(givenMetatypeRep, destMetatypeRep)) {
case metatypeRepPair(MetatypeRepresentation::Thick,
MetatypeRepresentation::ObjC):
convertedValue = SGF.B.emitThickToObjCMetatype(
loc, selfMeta.getValue(),
SILType::getPrimitiveObjectType(destMetatype));
break;
case metatypeRepPair(MetatypeRepresentation::ObjC,
MetatypeRepresentation::Thick):
convertedValue = SGF.B.emitObjCToThickMetatype(
loc, selfMeta.getValue(),
SILType::getPrimitiveObjectType(destMetatype));
break;
default:
llvm_unreachable("shouldn't happen");
}
auto result = ManagedValue::forUnmanaged(convertedValue);
return {result, SGF.getLoweredType(instanceType)};
}
/// Given a metatype value for the type, allocate an Objective-C
/// object (with alloc_ref_dynamic) of that type.
///
/// \returns the self object.
ManagedValue allocateObject(ManagedValue selfMeta,
SILLocation loc,
bool usesObjCAllocation) {
// Convert to the necessary metatype representation, if needed.
ManagedValue selfMetaConverted;
SILType instanceType;
std::tie(selfMetaConverted, instanceType) =
convertToMetatypeForAllocRefDynamic(selfMeta, loc, usesObjCAllocation);
// Allocate the object.
return SGF.B.createAllocRefDynamic(loc, selfMetaConverted, instanceType,
usesObjCAllocation, {}, {});
}
void processProtocolMethod(DeclRefExpr *e, AbstractFunctionDecl *afd,
ProtocolDecl *proto) {
ArgumentSource selfValue = selfApply->getArg();
auto subs = e->getDeclRef().getSubstitutions();
SILDeclRef::Kind kind = SILDeclRef::Kind::Func;
if (isa<ConstructorDecl>(afd)) {
if (proto->isObjC()) {
SILLocation loc = selfApply->getArg();
// For Objective-C initializers, we only have an initializing
// initializer. We need to allocate the object ourselves.
kind = SILDeclRef::Kind::Initializer;
auto metatype = std::move(selfValue).getAsSingleValue(SGF);
auto allocated = allocateObject(metatype, loc, /*objc*/ true);
auto allocatedType = allocated.getType().getASTType();
selfValue =
ArgumentSource(loc, RValue(SGF, loc, allocatedType, allocated));
} else {
// For non-Objective-C initializers, we have an allocating
// initializer to call.
kind = SILDeclRef::Kind::Allocator;
}
}
SILDeclRef constant(afd, kind);
constant = constant.asForeign(afd->isObjC());
// Prepare the callee.
Callee theCallee = Callee::forWitnessMethod(
SGF, selfValue.getSubstRValueType(),
constant, subs, e);
setSelfParam(std::move(selfValue));
setCallee(std::move(theCallee));
}
bool isClassMethod(DeclRefExpr *e, AbstractFunctionDecl *afd) {
if (e->getAccessSemantics() != AccessSemantics::Ordinary)
return false;
if (getMethodDispatch(afd) == MethodDispatch::Static)
return false;
if (auto ctor = dyn_cast<ConstructorDecl>(afd)) {
// Non-required initializers are statically dispatched.
if (!ctor->isRequired())
return false;
// @objc dynamic initializers are statically dispatched (we're
// calling the allocating entry point, which is a thunk that
// does the dynamic dispatch for us).
if (ctor->shouldUseObjCDispatch())
return false;
// Required constructors are statically dispatched when the 'self'
// value is statically derived.
assert(selfApply->getArg()->getType()->is<AnyMetatypeType>());
if (selfApply->getArg()->isStaticallyDerivedMetatype())
return false;
}
// Ok, we're dynamically dispatched.
return true;
}
void processClassMethod(DeclRefExpr *e, AbstractFunctionDecl *afd) {
ArgumentSource selfArgSource(selfApply->getArg());
setSelfParam(std::move(selfArgSource));
// Directly dispatch to calls of the replaced function inside of
// '@_dynamicReplacement(for:)' methods.
bool isObjCReplacementCall = false;
if (SGF.getOptions()
.EnableDynamicReplacementCanCallPreviousImplementation &&
isCallToReplacedInDynamicReplacement(SGF, afd, isObjCReplacementCall) &&
selfApply->getArg()->isSelfExprOf(
cast<AbstractFunctionDecl>(SGF.FunctionDC->getAsDecl()), false)) {
auto constant = SILDeclRef(afd).asForeign(
!isObjCReplacementCall && requiresForeignEntryPoint(e->getDecl()));
auto subs = e->getDeclRef().getSubstitutions();
if (isObjCReplacementCall)
setCallee(Callee::forDirect(SGF, constant, subs, e));
else
setCallee(Callee::forDirect(
SGF,
SILDeclRef(cast<AbstractFunctionDecl>(SGF.FunctionDC->getAsDecl())),
subs, e, true));
return;
}
auto constant = SILDeclRef(afd).asForeign(requiresForeignEntryPoint(afd));
auto subs = e->getDeclRef().getSubstitutions();
bool isObjCDirect = false;
if (auto objcDecl = dyn_cast_or_null<clang::ObjCMethodDecl>(
afd->getClangDecl())) {
isObjCDirect = objcDecl->isDirectMethod();
}
if (isObjCDirect) {
setCallee(Callee::forDirect(SGF, constant, subs, e));
} else {
setCallee(Callee::forClassMethod(SGF, constant, subs, e));
}
}
//
// Known callees.
//
void visitDeclRefExpr(DeclRefExpr *e) {
auto subs = e->getDeclRef().getSubstitutions();
// If this is a direct reference to a vardecl, just emit its value directly.
// Recursive references to callable declarations are allowed.
if (isa<VarDecl>(e->getDecl())) {
visitExpr(e);
return;
}
// Enum case constructor references are open-coded.
if (auto *eed = dyn_cast<EnumElementDecl>(e->getDecl())) {
if (selfApply) {
ArgumentSource selfArgSource(selfApply->getArg());
setSelfParam(std::move(selfArgSource));
}
setCallee(Callee::forEnumElement(SGF, SILDeclRef(eed), subs, e));
return;
}
// Ok, we have a constructor or a function.
auto *afd = cast<AbstractFunctionDecl>(e->getDecl());
// Witness method or @objc protocol dispatch.
if (auto *proto = dyn_cast<ProtocolDecl>(afd->getDeclContext())) {
processProtocolMethod(e, afd, proto);
return;
}
// VTable class method or @objc class method dispatch.
if (isClassMethod(e, afd)) {
processClassMethod(e, afd);
return;
}
// Otherwise, we have a statically-dispatched call.
auto constant = SILDeclRef(e->getDecl())
.asForeign(!isConstructorWithGeneratedAllocatorThunk(e->getDecl())
&& requiresForeignEntryPoint(e->getDecl()));
auto captureInfo = SGF.SGM.Types.getLoweredLocalCaptures(constant);
if (afd->getDeclContext()->isLocalContext() &&
!captureInfo.hasGenericParamCaptures())
subs = SubstitutionMap();
// Check whether we have to dispatch to the original implementation of a
// dynamically_replaceable inside of a dynamic_replacement(for:) function.
ApplyExpr *thisCallSite = (selfApply ? selfApply : callSite);
bool isObjCReplacementSelfCall = false;
bool isSelfCallToReplacedInDynamicReplacement =
SGF.getOptions()
.EnableDynamicReplacementCanCallPreviousImplementation &&
isCallToReplacedInDynamicReplacement(
SGF, cast<AbstractFunctionDecl>(constant.getDecl()),
isObjCReplacementSelfCall) &&
(afd->getDeclContext()->isModuleScopeContext() ||
thisCallSite->getArg()->isSelfExprOf(
cast<AbstractFunctionDecl>(SGF.FunctionDC->getAsDecl()), false));
if (isSelfCallToReplacedInDynamicReplacement && !isObjCReplacementSelfCall)
setCallee(Callee::forDirect(
SGF,
SILDeclRef(cast<AbstractFunctionDecl>(SGF.FunctionDC->getAsDecl()),
constant.kind),
subs, e, true));
else
setCallee(Callee::forDirect(SGF, constant, subs, e));
if (selfApply) {
// This is a statically-dispatched method with a 'self' parameter.
ArgumentSource selfArgSource(selfApply->getArg());
setSelfParam(std::move(selfArgSource));
}
// If the decl ref requires captures, emit the capture params.
if (!captureInfo.getCaptures().empty()) {
SmallVector<ManagedValue, 4> captures;
SGF.emitCaptures(e, SILDeclRef(afd),
CaptureEmission::ImmediateApplication,
captures);
applyCallee->setCaptures(std::move(captures));
}
}
void visitAbstractClosureExpr(AbstractClosureExpr *e) {
// Emit the closure body.
SGF.SGM.emitClosure(e);
// If we're in top-level code, we don't need to physically capture script
// globals, but we still need to mark them as escaping so that DI can flag
// uninitialized uses.
if (&SGF == SGF.SGM.TopLevelSGF) {
SGF.SGM.emitMarkFunctionEscapeForTopLevelCodeGlobals(e,e->getCaptureInfo());
}
// A directly-called closure can be emitted as a direct call instead of
// really producing a closure object.
SILDeclRef constant(e);
auto captureInfo = SGF.SGM.M.Types.getLoweredLocalCaptures(constant);
SubstitutionMap subs;
if (captureInfo.hasGenericParamCaptures())
subs = SGF.getForwardingSubstitutionMap();
setCallee(Callee::forDirect(SGF, constant, subs, e));
// If the closure requires captures, emit them.
if (!captureInfo.getCaptures().empty()) {
SmallVector<ManagedValue, 4> captures;
SGF.emitCaptures(e, constant, CaptureEmission::ImmediateApplication,
captures);
applyCallee->setCaptures(std::move(captures));
}
}
void visitOtherConstructorDeclRefExpr(OtherConstructorDeclRefExpr *e) {
auto subs = e->getDeclRef().getSubstitutions();
// FIXME: We might need to go through ObjC dispatch for references to
// constructors imported from Clang (which won't have a direct entry point)
// or to delegate to a designated initializer.
setCallee(Callee::forDirect(SGF,
SILDeclRef(e->getDecl(), SILDeclRef::Kind::Initializer),
subs, e));
}
void visitDotSyntaxBaseIgnoredExpr(DotSyntaxBaseIgnoredExpr *e) {
setSideEffect(e->getLHS());
visit(e->getRHS());
}
void visitFunctionConversionExpr(FunctionConversionExpr *e) {
// FIXME: Check whether this function conversion requires us to build a
// thunk.
visit(e->getSubExpr());
}
void visitCovariantFunctionConversionExpr(CovariantFunctionConversionExpr *e){
// FIXME: These expressions merely adjust the result type for DynamicSelf
// in an unchecked, ABI-compatible manner. They shouldn't prevent us form
// forming a complete call.
visitExpr(e);
}
void visitImplicitlyUnwrappedFunctionConversionExpr(
ImplicitlyUnwrappedFunctionConversionExpr *e) {
// These are generated for short term use in the type checker.
llvm_unreachable(
"We should not see ImplicitlyUnwrappedFunctionConversionExpr here");
}
void visitIdentityExpr(IdentityExpr *e) {
visit(e->getSubExpr());
}
void applySuper(ApplyExpr *apply) {
// Load the 'super' argument.
Expr *arg = apply->getArg();
RValue super;
CanType superFormalType = arg->getType()->getCanonicalType();
// The callee for a super call has to be either a method or constructor.
Expr *fn = apply->getFn();
SubstitutionMap substitutions;
SILDeclRef constant;
if (auto *ctorRef = dyn_cast<OtherConstructorDeclRefExpr>(fn)) {
constant = SILDeclRef(ctorRef->getDecl(), SILDeclRef::Kind::Initializer)
.asForeign(requiresForeignEntryPoint(ctorRef->getDecl()));
if (ctorRef->getDeclRef().isSpecialized())
substitutions = ctorRef->getDeclRef().getSubstitutions();
assert(SGF.SelfInitDelegationState ==
SILGenFunction::WillSharedBorrowSelf);
SGF.SelfInitDelegationState = SILGenFunction::WillExclusiveBorrowSelf;
super = SGF.emitRValue(arg);
assert(SGF.SelfInitDelegationState ==
SILGenFunction::DidExclusiveBorrowSelf);
// We know that we have a single ManagedValue rvalue for self.
ManagedValue superMV = std::move(super).getScalarValue();
// Check if super is not the same as our base type. This means that we
// performed an upcast, and we must have consumed the special cleanup
// we installed. Install a new special cleanup.
if (superMV.getValue() != SGF.InitDelegationSelf.getValue()) {
SILValue underlyingSelf = SGF.InitDelegationSelf.getValue();
SGF.InitDelegationSelf = ManagedValue::forUnmanaged(underlyingSelf);
CleanupHandle newWriteback = SGF.enterOwnedValueWritebackCleanup(
SGF.InitDelegationLoc.getValue(), SGF.InitDelegationSelfBox,
superMV.forward(SGF));
SGF.SuperInitDelegationSelf =
ManagedValue(superMV.getValue(), newWriteback);
super = RValue(SGF, SGF.InitDelegationLoc.getValue(), superFormalType,
SGF.SuperInitDelegationSelf);
}
} else if (auto *declRef = dyn_cast<DeclRefExpr>(fn)) {
assert(isa<FuncDecl>(declRef->getDecl()) && "non-function super call?!");
constant = SILDeclRef(declRef->getDecl())
.asForeign(requiresForeignEntryPoint(declRef->getDecl()));
if (declRef->getDeclRef().isSpecialized())
substitutions = declRef->getDeclRef().getSubstitutions();
super = SGF.emitRValue(arg);
} else {
llvm_unreachable("invalid super callee");
}
assert(super.isComplete() && "At this point super should be a complete "
"rvalue that is not in any special states");
ArgumentSource superArgSource(arg, std::move(super));
if (!canUseStaticDispatch(SGF, constant)) {
// ObjC super calls require dynamic dispatch.
setCallee(Callee::forSuperMethod(SGF, constant, substitutions, fn));
} else {
// Native Swift super calls to final methods are direct.
setCallee(Callee::forDirect(SGF, constant, substitutions, fn));
}
setSelfParam(std::move(superArgSource));
}
/// Walk the given \c selfArg expression that produces the appropriate
/// `self` for a call, applying the same transformations to the provided
/// \c selfValue (which might be a metatype).
///
/// This is used for initializer delegation, so it covers only the narrow
/// subset of expressions used there.
ManagedValue emitCorrespondingSelfValue(ManagedValue selfValue,
Expr *selfArg) {
SILLocation loc = selfArg;
auto resultTy = selfArg->getType()->getCanonicalType();
while (true) {
// Handle archetype-to-super and derived-to-base upcasts.
if (isa<ArchetypeToSuperExpr>(selfArg) ||
isa<DerivedToBaseExpr>(selfArg)) {
selfArg = cast<ImplicitConversionExpr>(selfArg)->getSubExpr();
continue;
}
// Skip over loads.
if (auto load = dyn_cast<LoadExpr>(selfArg)) {
selfArg = load->getSubExpr();
resultTy = resultTy->getRValueType()->getCanonicalType();
continue;
}
// Skip over inout expressions.
if (auto inout = dyn_cast<InOutExpr>(selfArg)) {
selfArg = inout->getSubExpr();
resultTy = resultTy->getInOutObjectType()->getCanonicalType();
continue;
}
// Declaration references terminate the search.
if (isa<DeclRefExpr>(selfArg))
break;
llvm_unreachable("unhandled conversion for metatype value");
}
assert(isa<DeclRefExpr>(selfArg) &&
"unexpected expr kind in self argument of initializer delegation");
// If the 'self' value is a metatype, update the target type
// accordingly.
SILType loweredResultTy;
auto selfMetaTy = selfValue.getType().getAs<AnyMetatypeType>();
if (selfMetaTy) {
loweredResultTy = SILType::getPrimitiveObjectType(
CanMetatypeType::get(resultTy, selfMetaTy->getRepresentation()));
} else {
loweredResultTy = SGF.getLoweredLoadableType(resultTy);
}
if (loweredResultTy != selfValue.getType()) {
// Introduce dynamic Self if necessary. A class initializer receives
// a metatype argument that's formally the non-dynamic base class type
// (though always dynamically of Self type),
// but when invoking a protocol initializer, we need to pass it as
// dynamic Self.
if (!selfValue.getType().getASTType()->hasDynamicSelfType()
&& loweredResultTy.getASTType()->hasDynamicSelfType()) {
assert(selfMetaTy);
selfValue = SGF.emitManagedRValueWithCleanup(
SGF.B.createUncheckedReinterpretCast(loc, selfValue.forward(SGF),
loweredResultTy));
} else {
selfValue = SGF.emitManagedRValueWithCleanup(
SGF.B.createUpcast(loc, selfValue.forward(SGF), loweredResultTy));
}
}
return selfValue;
}
/// Try to emit the given application as initializer delegation.
bool applyInitDelegation(ApplyExpr *expr) {
// Dig out the constructor we're delegating to.
Expr *fn = expr->getFn();
auto ctorRef = dyn_cast<OtherConstructorDeclRefExpr>(
fn->getSemanticsProvidingExpr());
if (!ctorRef)
return false;
// Determine whether we'll need to use an allocating constructor (vs. the
// initializing constructor).
auto nominal = ctorRef->getDecl()->getDeclContext()
->getSelfNominalTypeDecl();
bool useAllocatingCtor;
// Value types only have allocating initializers.
if (isa<StructDecl>(nominal) || isa<EnumDecl>(nominal))
useAllocatingCtor = true;
// Protocols only witness allocating initializers, except for @objc
// protocols, which only witness initializing initializers.
else if (auto proto = dyn_cast<ProtocolDecl>(nominal)) {
useAllocatingCtor = !proto->isObjC();
// Factory initializers are effectively "allocating" initializers with no
// corresponding initializing entry point.
} else if (ctorRef->getDecl()->isFactoryInit()) {
useAllocatingCtor = true;
// If we're emitting a class initializer's non-allocating entry point and
// delegating to an initializer exposed to Objective-C, use the initializing
// entry point to avoid replacing an existing allocated object.
} else if (!SGF.AllocatorMetatype && ctorRef->getDecl()->isObjC()) {
useAllocatingCtor = false;
// In general, though, class initializers self.init-delegate to each other
// via their allocating entry points.
} else {
assert(isa<ClassDecl>(nominal)
&& "some new kind of init context we haven't implemented");
useAllocatingCtor = !requiresForeignEntryPoint(ctorRef->getDecl());
}
// Load the 'self' argument.
Expr *arg = expr->getArg();
ManagedValue self;
CanType selfFormalType = arg->getType()->getCanonicalType();
// If we're using the allocating constructor, we need to pass along the
// metatype.
if (useAllocatingCtor) {
selfFormalType = CanMetatypeType::get(
selfFormalType->getInOutObjectType()->getCanonicalType());
// If the initializer is a C function imported as a member,
// there is no 'self' parameter. Mark it undef.
if (ctorRef->getDecl()->isImportAsMember()) {
self = SGF.emitUndef(selfFormalType);
} else if (SGF.AllocatorMetatype) {
self = emitCorrespondingSelfValue(
ManagedValue::forUnmanaged(SGF.AllocatorMetatype), arg);
} else {
self = ManagedValue::forUnmanaged(SGF.emitMetatypeOfValue(expr, arg));
}
} else {
// If we haven't allocated "self" yet at this point, do so.
if (SGF.AllocatorMetatype) {
bool usesObjCAllocation;
if (auto clas = dyn_cast<ClassDecl>(nominal)) {
usesObjCAllocation = usesObjCAllocator(clas);
} else {
// In the protocol extension case, we should only be here if the callee
// initializer is @objc.
usesObjCAllocation = true;
}
self = allocateObject(
ManagedValue::forUnmanaged(SGF.AllocatorMetatype), arg,
usesObjCAllocation);
// Perform any adjustments needed to 'self'.
self = emitCorrespondingSelfValue(self, arg);
} else {
assert(SGF.SelfInitDelegationState ==
SILGenFunction::WillSharedBorrowSelf);
SGF.SelfInitDelegationState = SILGenFunction::WillExclusiveBorrowSelf;
self = SGF.emitRValueAsSingleValue(arg);
assert(SGF.SelfInitDelegationState ==
SILGenFunction::DidExclusiveBorrowSelf);
}
}
auto subs = ctorRef->getDeclRef().getSubstitutions();
ArgumentSource selfArgSource(arg, RValue(SGF, expr, selfFormalType, self));
SILDeclRef constant(ctorRef->getDecl(),
useAllocatingCtor
? SILDeclRef::Kind::Allocator
: SILDeclRef::Kind::Initializer);
bool isObjCReplacementSelfCall = false;
bool isSelfCallToReplacedInDynamicReplacement =
SGF.getOptions()
.EnableDynamicReplacementCanCallPreviousImplementation &&
isCallToReplacedInDynamicReplacement(
SGF, cast<AbstractFunctionDecl>(constant.getDecl()),
isObjCReplacementSelfCall) &&
arg->isSelfExprOf(
cast<AbstractFunctionDecl>(SGF.FunctionDC->getAsDecl()), false);
if (!isObjCReplacementSelfCall) {
if (useAllocatingCtor) {
constant =
constant.asForeign(requiresForeignEntryPoint(ctorRef->getDecl()));
} else {
// Note: if we ever implement delegating from one designated initializer
// to another, this won't be correct; that should do a direct dispatch.
constant = constant.asForeign(ctorRef->getDecl()->isObjC());
}
}
// Determine the callee. This is normally the allocating
// entry point, unless we're delegating to an ObjC initializer.
if (isa<ProtocolDecl>(ctorRef->getDecl()->getDeclContext())) {
// Look up the witness for the constructor.
setCallee(Callee::forWitnessMethod(
SGF, self.getType().getASTType(),
constant, subs, expr));
} else if ((useAllocatingCtor || constant.isForeign) &&
!isSelfCallToReplacedInDynamicReplacement &&
((constant.isForeign && !useAllocatingCtor) ||
getMethodDispatch(ctorRef->getDecl()) == MethodDispatch::Class)) {
// Dynamic dispatch to the initializer.
Scope S(SGF, expr);
setCallee(Callee::forClassMethod(
SGF, constant, subs, fn));
} else {
// Directly call the peer constructor.
if (isObjCReplacementSelfCall ||
!isSelfCallToReplacedInDynamicReplacement)
setCallee(Callee::forDirect(SGF, constant, subs, fn));
else
setCallee(Callee::forDirect(
SGF,
SILDeclRef(cast<AbstractFunctionDecl>(SGF.FunctionDC->getAsDecl()),
constant.kind),
subs, fn, true));
}
setSelfParam(std::move(selfArgSource));
return true;
}
Callee getCallee() {
assert(applyCallee && "did not find callee?!");
return std::move(*applyCallee);
}
/// Ignore parentheses and implicit conversions.
static Expr *ignoreParensAndImpConversions(Expr *expr) {
while (true) {
if (auto ice = dyn_cast<ImplicitConversionExpr>(expr)) {
expr = ice->getSubExpr();
continue;
}
// Simple optional-to-optional conversions. This doesn't work
// for the full generality of OptionalEvaluationExpr, but it
// works given that we check the result for certain forms.
if (auto eval = dyn_cast<OptionalEvaluationExpr>(expr)) {
if (auto inject = dyn_cast<InjectIntoOptionalExpr>(eval->getSubExpr())) {
if (auto bind = dyn_cast<BindOptionalExpr>(inject->getSubExpr())) {
if (bind->getDepth() == 0)
return bind->getSubExpr();
}
}
}
auto valueProviding = expr->getValueProvidingExpr();
if (valueProviding != expr) {
expr = valueProviding;
continue;
}
return expr;
}
}
void visitForceValueExpr(ForceValueExpr *e) {
// If this application is a dynamic member reference that is forced to
// succeed with the '!' operator, emit it as a direct invocation of the
// method we found.
if (emitForcedDynamicMemberRef(e))
return;
visitExpr(e);
}
/// If this application forces a dynamic member reference with !, emit
/// a direct reference to the member.
bool emitForcedDynamicMemberRef(ForceValueExpr *e) {
// Check whether the argument is a dynamic member reference.
auto arg = ignoreParensAndImpConversions(e->getSubExpr());
auto openExistential = dyn_cast<OpenExistentialExpr>(arg);
if (openExistential)
arg = openExistential->getSubExpr();
auto dynamicMemberRef = dyn_cast<DynamicMemberRefExpr>(arg);
if (!dynamicMemberRef)
return false;
// Since we'll be collapsing this call site, make sure there's another
// call site that will actually perform the invocation.
if (callSite == nullptr)
return false;
// Only @objc methods can be forced.
auto memberRef = dynamicMemberRef->getMember();
auto *fd = dyn_cast<FuncDecl>(memberRef.getDecl());
if (!fd || !fd->isObjC())
return false;
FormalEvaluationScope writebackScope(SGF);
// Local function that actually emits the dynamic member reference.
auto emitDynamicMemberRef = [&] {
// We found it. Emit the base.
ArgumentSource baseArgSource(dynamicMemberRef->getBase(),
SGF.emitRValue(dynamicMemberRef->getBase()));
// Determine the type of the method we referenced, by replacing the
// class type of the 'Self' parameter with AnyObject.
auto member = SILDeclRef(fd).asForeign();
auto substFormalType = cast<FunctionType>(dynamicMemberRef->getType()
->getCanonicalType()
.getOptionalObjectType());
auto substSelfType = dynamicMemberRef->getBase()->getType()->getCanonicalType();
substFormalType = CanFunctionType::get(
{AnyFunctionType::Param(substSelfType)},
substFormalType);
setCallee(Callee::forDynamic(SGF, member,
memberRef.getSubstitutions(),
substFormalType, {}, e));
setSelfParam(std::move(baseArgSource));
};
// When we have an open existential, open it and then emit the
// member reference.
if (openExistential) {
SGF.emitOpenExistentialExpr(openExistential,
[&](Expr*) { emitDynamicMemberRef(); });
} else {
emitDynamicMemberRef();
}
return true;
}
};
} // end anonymous namespace
static PreparedArguments emitStringLiteral(SILGenFunction &SGF, Expr *E,
StringRef Str, SGFContext C,
StringLiteralExpr::Encoding encoding) {
uint64_t Length;
bool isASCII = SGF.getASTContext().isASCIIString(Str);
StringLiteralInst::Encoding instEncoding;
switch (encoding) {
case StringLiteralExpr::UTF8:
instEncoding = StringLiteralInst::Encoding::UTF8;
Length = Str.size();
break;
case StringLiteralExpr::OneUnicodeScalar: {
SILType Int32Ty = SILType::getBuiltinIntegerType(32, SGF.getASTContext());
SILValue UnicodeScalarValue =
SGF.B.createIntegerLiteral(E, Int32Ty,
unicode::extractFirstUnicodeScalar(Str));
AnyFunctionType::Param param(Int32Ty.getASTType());
PreparedArguments args(llvm::ArrayRef<AnyFunctionType::Param>{param});
args.add(E, RValue(SGF, E, Int32Ty.getASTType(),
ManagedValue::forUnmanaged(UnicodeScalarValue)));
return args;
}
}
// The string literal provides the data.
auto *string = SGF.B.createStringLiteral(E, Str, instEncoding);
// The length is lowered as an integer_literal.
auto WordTy = SILType::getBuiltinWordType(SGF.getASTContext());
auto *lengthInst = SGF.B.createIntegerLiteral(E, WordTy, Length);
// The 'isascii' bit is lowered as an integer_literal.
auto Int1Ty = SILType::getBuiltinIntegerType(1, SGF.getASTContext());
auto *isASCIIInst = SGF.B.createIntegerLiteral(E, Int1Ty, isASCII);
ManagedValue EltsArray[] = {
ManagedValue::forUnmanaged(string),
ManagedValue::forUnmanaged(lengthInst),
ManagedValue::forUnmanaged(isASCIIInst)
};
AnyFunctionType::Param TypeEltsArray[] = {
AnyFunctionType::Param(EltsArray[0].getType().getASTType()),
AnyFunctionType::Param(EltsArray[1].getType().getASTType()),
AnyFunctionType::Param(EltsArray[2].getType().getASTType())
};
ArrayRef<ManagedValue> Elts;
ArrayRef<AnyFunctionType::Param> TypeElts;
switch (instEncoding) {
case StringLiteralInst::Encoding::UTF8:
Elts = EltsArray;
TypeElts = TypeEltsArray;
break;
case StringLiteralInst::Encoding::Bytes:
case StringLiteralInst::Encoding::ObjCSelector:
llvm_unreachable("these cannot be formed here");
}
PreparedArguments args(TypeElts);
for (unsigned i = 0, e = Elts.size(); i != e; ++i) {
args.add(E, RValue(SGF, Elts[i], CanType(TypeElts[i].getPlainType())));
}
return args;
}
/// Emit a raw apply operation, performing no additional lowering of
/// either the arguments or the result.
static void emitRawApply(SILGenFunction &SGF,
SILLocation loc,
ManagedValue fn,
SubstitutionMap subs,
ArrayRef<ManagedValue> args,
CanSILFunctionType substFnType,
ApplyOptions options,
ArrayRef<SILValue> indirectResultAddrs,
SmallVectorImpl<SILValue> &rawResults) {
SILFunctionConventions substFnConv(substFnType, SGF.SGM.M);
// Get the callee value.
bool isConsumed = substFnType->isCalleeConsumed();
bool isUnowned = substFnType->isCalleeUnowned();
SILValue fnValue =
isUnowned ? fn.getValue()
: isConsumed ? fn.forward(SGF)
: fn.formalAccessBorrow(SGF, loc).getValue();
SmallVector<SILValue, 4> argValues;
// Add the buffers for the indirect results if needed.
#ifndef NDEBUG
assert(indirectResultAddrs.size() == substFnConv.getNumIndirectSILResults());
unsigned resultIdx = 0;
for (auto indResultTy :
substFnConv.getIndirectSILResultTypes(SGF.getTypeExpansionContext())) {
assert(indResultTy == indirectResultAddrs[resultIdx++]->getType());
}
#endif
argValues.append(indirectResultAddrs.begin(), indirectResultAddrs.end());
auto inputParams = substFnType->getParameters();
assert(inputParams.size() == args.size());
// Gather the arguments.
for (auto i : indices(args)) {
auto argValue = (inputParams[i].isConsumed() ? args[i].forward(SGF)
: args[i].getValue());
#ifndef NDEBUG
auto inputTy =
substFnConv.getSILType(inputParams[i], SGF.getTypeExpansionContext());
if (argValue->getType() != inputTy) {
auto &out = llvm::errs();
out << "TYPE MISMATCH IN ARGUMENT " << i << " OF APPLY AT ";
printSILLocationDescription(out, loc, SGF.getASTContext());
out << " argument value: ";
argValue->print(out);
out << " parameter type: ";
inputTy.print(out);
out << "\n";
abort();
}
#endif
argValues.push_back(argValue);
}
auto resultType = substFnConv.getSILResultType(SGF.getTypeExpansionContext());
// If the function is a coroutine, we need to use 'begin_apply'.
if (substFnType->isCoroutine()) {
assert(!substFnType->hasErrorResult());
auto apply = SGF.B.createBeginApply(loc, fnValue, subs, argValues);
for (auto result : apply->getAllResults())
rawResults.push_back(result);
return;
}
// If we don't have an error result, we can make a simple 'apply'.
if (!substFnType->hasErrorResult()) {
auto result = SGF.B.createApply(loc, fnValue, subs, argValues);
rawResults.push_back(result);
// Otherwise, we need to create a try_apply.
} else {
SILBasicBlock *normalBB = SGF.createBasicBlock();
auto result = normalBB->createPhiArgument(resultType, OwnershipKind::Owned);
rawResults.push_back(result);
SILBasicBlock *errorBB =
SGF.getTryApplyErrorDest(loc, substFnType,
substFnType->getErrorResult(),
options & ApplyOptions::DoesNotThrow);
SGF.B.createTryApply(loc, fnValue, subs, argValues,
normalBB, errorBB);
SGF.B.emitBlock(normalBB);
}
}
static bool hasUnownedInnerPointerResult(CanSILFunctionType fnType) {
for (auto result : fnType->getResults()) {
if (result.getConvention() == ResultConvention::UnownedInnerPointer)
return true;
}
return false;
}
//===----------------------------------------------------------------------===//
// Argument Emission for Builtin Initializer
//===----------------------------------------------------------------------===//
static inline PreparedArguments
buildBuiltinLiteralArgs(SILGenFunction &SGF, SGFContext C,
StringLiteralExpr *stringLiteral) {
return emitStringLiteral(SGF, stringLiteral, stringLiteral->getValue(), C,
stringLiteral->getEncoding());
}
static inline PreparedArguments
buildBuiltinLiteralArgs(NilLiteralExpr *nilLiteral) {
PreparedArguments builtinLiteralArgs;
builtinLiteralArgs.emplace({});
return builtinLiteralArgs;
}
static inline PreparedArguments
buildBuiltinLiteralArgs(SILGenFunction &SGF, SGFContext C,
BooleanLiteralExpr *booleanLiteral) {
PreparedArguments builtinLiteralArgs;
auto i1Ty = SILType::getBuiltinIntegerType(1, SGF.getASTContext());
SILValue boolValue = SGF.B.createIntegerLiteral(booleanLiteral, i1Ty,
booleanLiteral->getValue());
ManagedValue boolManaged = ManagedValue::forUnmanaged(boolValue);
CanType ty = boolManaged.getType().getASTType()->getCanonicalType();
builtinLiteralArgs.emplace(AnyFunctionType::Param(ty));
builtinLiteralArgs.add(booleanLiteral, RValue(SGF, {boolManaged}, ty));
return builtinLiteralArgs;
}
static inline PreparedArguments
buildBuiltinLiteralArgs(SILGenFunction &SGF, SGFContext C,
IntegerLiteralExpr *integerLiteral) {
PreparedArguments builtinLiteralArgs;
ManagedValue integerManaged =
ManagedValue::forUnmanaged(SGF.B.createIntegerLiteral(
integerLiteral,
SILType::getBuiltinIntegerLiteralType(SGF.getASTContext()),
integerLiteral->getRawValue()));
CanType ty = integerManaged.getType().getASTType();
builtinLiteralArgs.emplace(AnyFunctionType::Param(ty));
builtinLiteralArgs.add(integerLiteral, RValue(SGF, {integerManaged}, ty));
return builtinLiteralArgs;
}
static inline PreparedArguments
buildBuiltinLiteralArgs(SILGenFunction &SGF, SGFContext C,
FloatLiteralExpr *floatLiteral) {
PreparedArguments builtinLiteralArgs;
auto *litTy = floatLiteral->getBuiltinType()->castTo<BuiltinFloatType>();
ManagedValue floatManaged =
ManagedValue::forUnmanaged(SGF.B.createFloatLiteral(
floatLiteral,
SILType::getBuiltinFloatType(litTy->getFPKind(), SGF.getASTContext()),
floatLiteral->getValue()));
CanType ty = floatManaged.getType().getASTType();
builtinLiteralArgs.emplace(AnyFunctionType::Param(ty));
builtinLiteralArgs.add(floatLiteral, RValue(SGF, {floatManaged}, ty));
return builtinLiteralArgs;
}
static inline PreparedArguments
buildBuiltinLiteralArgs(SILGenFunction &SGF, SGFContext C,
MagicIdentifierLiteralExpr *magicLiteral) {
ASTContext &ctx = SGF.getASTContext();
SourceLoc loc = magicLiteral->getStartLoc();
switch (magicLiteral->getKind()) {
case MagicIdentifierLiteralExpr::FileIDSpelledAsFile:
case MagicIdentifierLiteralExpr::FileID: {
std::string value = loc.isValid() ? SGF.getMagicFileIDString(loc) : "";
return emitStringLiteral(SGF, magicLiteral, value, C,
magicLiteral->getStringEncoding());
}
case MagicIdentifierLiteralExpr::FilePathSpelledAsFile:
case MagicIdentifierLiteralExpr::FilePath: {
StringRef value = loc.isValid() ? SGF.getMagicFilePathString(loc) : "";
return emitStringLiteral(SGF, magicLiteral, value, C,
magicLiteral->getStringEncoding());
}
case MagicIdentifierLiteralExpr::Function: {
StringRef value = loc.isValid() ? SGF.getMagicFunctionString() : "";
return emitStringLiteral(SGF, magicLiteral, value, C,
magicLiteral->getStringEncoding());
}
case MagicIdentifierLiteralExpr::Line:
case MagicIdentifierLiteralExpr::Column: {
SourceLoc Loc = magicLiteral->getStartLoc();
unsigned Value = 0;
if (Loc.isValid()) {
Value = magicLiteral->getKind() == MagicIdentifierLiteralExpr::Line
? ctx.SourceMgr.getPresumedLineAndColumnForLoc(Loc).first
: ctx.SourceMgr.getPresumedLineAndColumnForLoc(Loc).second;
}
auto silTy = SILType::getBuiltinIntegerLiteralType(ctx);
auto ty = silTy.getASTType();
SILValue integer = SGF.B.createIntegerLiteral(magicLiteral, silTy, Value);
ManagedValue integerManaged = ManagedValue::forUnmanaged(integer);
PreparedArguments builtinLiteralArgs;
builtinLiteralArgs.emplace(AnyFunctionType::Param(ty));
builtinLiteralArgs.add(magicLiteral, RValue(SGF, {integerManaged}, ty));
return builtinLiteralArgs;
}
case MagicIdentifierLiteralExpr::DSOHandle:
llvm_unreachable("handled elsewhere");
}
}
static inline PreparedArguments buildBuiltinLiteralArgs(SILGenFunction &SGF,
SGFContext C,
LiteralExpr *literal) {
if (auto stringLiteral = dyn_cast<StringLiteralExpr>(literal)) {
return buildBuiltinLiteralArgs(SGF, C, stringLiteral);
} else if (auto nilLiteral = dyn_cast<NilLiteralExpr>(literal)) {
return buildBuiltinLiteralArgs(nilLiteral);
} else if (auto booleanLiteral = dyn_cast<BooleanLiteralExpr>(literal)) {
return buildBuiltinLiteralArgs(SGF, C, booleanLiteral);
} else if (auto integerLiteral = dyn_cast<IntegerLiteralExpr>(literal)) {
return buildBuiltinLiteralArgs(SGF, C, integerLiteral);
} else if (auto floatLiteral = dyn_cast<FloatLiteralExpr>(literal)) {
return buildBuiltinLiteralArgs(SGF, C, floatLiteral);
} else {
return buildBuiltinLiteralArgs(
SGF, C, cast<MagicIdentifierLiteralExpr>(literal));
}
}
//===----------------------------------------------------------------------===//
// Argument Emission
//===----------------------------------------------------------------------===//
/// Count the number of SILParameterInfos that are needed in order to
/// pass the given argument.
static unsigned getFlattenedValueCount(AbstractionPattern origType,
CanType substType) {
// The count is always 1 unless the substituted type is a tuple.
auto substTuple = dyn_cast<TupleType>(substType);
if (!substTuple)
return 1;
// If the original type is opaque, the count is 1 anyway.
if (origType.isTypeParameter())
return 1;
// Otherwise, add up the elements.
unsigned count = 0;
for (auto i : indices(substTuple.getElementTypes())) {
count += getFlattenedValueCount(origType.getTupleElementType(i),
substTuple.getElementType(i));
}
return count;
}
/// Count the number of SILParameterInfos that are needed in order to
/// pass the given argument.
static unsigned getFlattenedValueCount(AbstractionPattern origType,
CanType substType,
ImportAsMemberStatus foreignSelf) {
// C functions imported as static methods don't consume any real arguments.
if (foreignSelf.isStatic())
return 0;
return getFlattenedValueCount(origType, substType);
}
namespace {
/// The original argument expression for some sort of complex
/// argument emission.
class OriginalArgument {
llvm::PointerIntPair<Expr*, 1, bool> ExprAndIsIndirect;
public:
OriginalArgument() = default;
OriginalArgument(Expr *expr, bool indirect)
: ExprAndIsIndirect(expr, indirect) {}
Expr *getExpr() const { return ExprAndIsIndirect.getPointer(); }
bool isIndirect() const { return ExprAndIsIndirect.getInt(); }
};
/// A possibly-discontiguous slice of function parameters claimed by a
/// function application.
class ClaimedParamsRef {
public:
static constexpr const unsigned NoSkip = (unsigned)-1;
private:
ArrayRef<SILParameterInfo> Params;
// The index of the param excluded from this range, if any, or ~0.
unsigned SkipParamIndex;
void checkParams() {
// The parameters should already have been substituted into the caller's
// context, and had the SILFunctionType substitutions applied, before we
// queue them up to be claimed.
#ifndef NDEBUG
for (auto param : Params) {
assert(!param.getInterfaceType()->hasTypeParameter()
&& "params should be substituted into context");
}
#endif
}
friend struct ParamLowering;
explicit ClaimedParamsRef(ArrayRef<SILParameterInfo> params,
unsigned skip)
: Params(params), SkipParamIndex(skip)
{
checkParams();
// Eagerly chop a skipped parameter off either end.
if (SkipParamIndex == 0) {
Params = Params.slice(1);
SkipParamIndex = NoSkip;
}
assert(!hasSkip() || SkipParamIndex < Params.size());
}
bool hasSkip() const {
return SkipParamIndex != (unsigned)NoSkip;
}
public:
ClaimedParamsRef() : Params({}), SkipParamIndex(-1) {}
explicit ClaimedParamsRef(ArrayRef<SILParameterInfo> params)
: Params(params), SkipParamIndex(NoSkip)
{
checkParams();
}
struct iterator : public std::iterator<std::random_access_iterator_tag,
SILParameterInfo>
{
const SILParameterInfo *Base;
unsigned I, SkipParamIndex;
iterator(const SILParameterInfo *Base,
unsigned I, unsigned SkipParamIndex)
: Base(Base), I(I), SkipParamIndex(SkipParamIndex)
{}
iterator &operator++() {
++I;
if (I == SkipParamIndex)
++I;
return *this;
}
iterator operator++(int) {
iterator old(*this);
++*this;
return old;
}
iterator &operator--() {
--I;
if (I == SkipParamIndex)
--I;
return *this;
}
iterator operator--(int) {
iterator old(*this);
--*this;
return old;
}
const SILParameterInfo &operator*() const {
return Base[I];
}
const SILParameterInfo *operator->() const {
return Base + I;
}
bool operator==(iterator other) const {
return Base == other.Base && I == other.I
&& SkipParamIndex == other.SkipParamIndex;
}
bool operator!=(iterator other) const {
return !(*this == other);
}
iterator operator+(std::ptrdiff_t distance) const {
if (distance > 0)
return goForward(distance);
if (distance < 0)
return goBackward(distance);
return *this;
}
iterator operator-(std::ptrdiff_t distance) const {
if (distance > 0)
return goBackward(distance);
if (distance < 0)
return goForward(distance);
return *this;
}
std::ptrdiff_t operator-(iterator other) const {
assert(Base == other.Base && SkipParamIndex == other.SkipParamIndex);
auto baseDistance = (std::ptrdiff_t)I - (std::ptrdiff_t)other.I;
if (std::min(I, other.I) < SkipParamIndex &&
std::max(I, other.I) > SkipParamIndex)
return baseDistance - 1;
return baseDistance;
}
iterator goBackward(unsigned distance) const {
auto result = *this;
if (I > SkipParamIndex && I <= SkipParamIndex + distance)
result.I -= (distance + 1);
result.I -= distance;
return result;
}
iterator goForward(unsigned distance) const {
auto result = *this;
if (I < SkipParamIndex && I + distance >= SkipParamIndex)
result.I += distance + 1;
result.I += distance;
return result;
}
};
iterator begin() const {
return iterator{Params.data(), 0, SkipParamIndex};
}
iterator end() const {
return iterator{Params.data(), (unsigned)Params.size(), SkipParamIndex};
}
unsigned size() const {
return Params.size() - (hasSkip() ? 1 : 0);
}
bool empty() const { return size() == 0; }
SILParameterInfo front() const { return *begin(); }
ClaimedParamsRef slice(unsigned start) const {
if (start >= SkipParamIndex)
return ClaimedParamsRef(Params.slice(start + 1), NoSkip);
return ClaimedParamsRef(Params.slice(start),
hasSkip() ? SkipParamIndex - start : NoSkip);
}
ClaimedParamsRef slice(unsigned start, unsigned count) const {
if (start >= SkipParamIndex)
return ClaimedParamsRef(Params.slice(start + 1, count), NoSkip);
unsigned newSkip = SkipParamIndex;
if (hasSkip())
newSkip -= start;
if (newSkip < count)
return ClaimedParamsRef(Params.slice(start, count+1), newSkip);
return ClaimedParamsRef(Params.slice(start, count), NoSkip);
}
};
/// A delayed argument. Call arguments are evaluated in two phases:
/// a formal evaluation phase and a formal access phase. The primary
/// example of this is an l-value that is passed by reference, where
/// the access to the l-value does not begin until the formal access
/// phase, but there are other examples, generally relating to pointer
/// conversions.
///
/// A DelayedArgument represents the part of evaluating an argument
/// that's been delayed until the formal access phase.
class DelayedArgument {
public:
enum KindTy {
/// This is a true inout argument.
InOut,
LastLVKindWithoutExtra = InOut,
/// The l-value needs to be converted to a pointer type.
LValueToPointer,
/// An array l-value needs to be converted to a pointer type.
LValueArrayToPointer,
LastLVKind = LValueArrayToPointer,
/// An array r-value needs to be converted to a pointer type.
RValueArrayToPointer,
/// A string r-value needs to be converted to a pointer type.
RValueStringToPointer,
/// A function conversion needs to occur.
FunctionConversion,
LastRVKind = FunctionConversion,
/// This is an immutable borrow from an l-value.
BorrowedLValue,
/// A default argument that needs to be evaluated.
DefaultArgument,
};
private:
KindTy Kind;
struct LValueStorage {
LValue LV;
SILLocation Loc;
LValueStorage(LValue &&lv, SILLocation loc) : LV(std::move(lv)), Loc(loc) {}
};
struct RValueStorage {
ManagedValue RV;
RValueStorage(ManagedValue rv) : RV(rv) {}
};
struct DefaultArgumentStorage {
SILLocation loc;
ConcreteDeclRef defaultArgsOwner;
unsigned destIndex;
CanType resultType;
AbstractionPattern origResultType;
ClaimedParamsRef paramsToEmit;
SILFunctionTypeRepresentation functionRepresentation;
DefaultArgumentStorage(SILLocation loc,
ConcreteDeclRef defaultArgsOwner,
unsigned destIndex,
CanType resultType,
AbstractionPattern origResultType,
ClaimedParamsRef paramsToEmit,
SILFunctionTypeRepresentation functionRepresentation)
: loc(loc), defaultArgsOwner(defaultArgsOwner), destIndex(destIndex),
resultType(resultType), origResultType(origResultType),
paramsToEmit(paramsToEmit),
functionRepresentation(functionRepresentation)
{}
};
struct BorrowedLValueStorage {
LValue LV;
SILLocation Loc;
AbstractionPattern OrigParamType;
ClaimedParamsRef ParamsToEmit;
};
using ValueMembers =
ExternalUnionMembers<RValueStorage, LValueStorage,
DefaultArgumentStorage,
BorrowedLValueStorage>;
static ValueMembers::Index getValueMemberIndexForKind(KindTy kind) {
switch (kind) {
case InOut:
case LValueToPointer:
case LValueArrayToPointer:
return ValueMembers::indexOf<LValueStorage>();
case RValueArrayToPointer:
case RValueStringToPointer:
case FunctionConversion:
return ValueMembers::indexOf<RValueStorage>();
case DefaultArgument:
return ValueMembers::indexOf<DefaultArgumentStorage>();
case BorrowedLValue:
return ValueMembers::indexOf<BorrowedLValueStorage>();
}
llvm_unreachable("bad kind");
}
/// Storage for either the l-value or the r-value.
ExternalUnion<KindTy, ValueMembers, getValueMemberIndexForKind> Value;
LValueStorage &LV() { return Value.get<LValueStorage>(Kind); }
const LValueStorage &LV() const { return Value.get<LValueStorage>(Kind); }
RValueStorage &RV() { return Value.get<RValueStorage>(Kind); }
const RValueStorage &RV() const { return Value.get<RValueStorage>(Kind); }
/// The original argument expression, which will be emitted down
/// to the point from which the l-value or r-value was generated.
OriginalArgument Original;
using PointerAccessInfo = SILGenFunction::PointerAccessInfo;
using ArrayAccessInfo = SILGenFunction::ArrayAccessInfo;
using ExtraMembers =
ExternalUnionMembers<void,
ArrayAccessInfo,
PointerAccessInfo>;
static ExtraMembers::Index getExtraMemberIndexForKind(KindTy kind) {
switch (kind) {
case LValueToPointer:
return ExtraMembers::indexOf<PointerAccessInfo>();
case LValueArrayToPointer:
case RValueArrayToPointer:
return ExtraMembers::indexOf<ArrayAccessInfo>();
default:
return ExtraMembers::indexOf<void>();
}
}
ExternalUnion<KindTy, ExtraMembers, getExtraMemberIndexForKind> Extra;
public:
DelayedArgument(KindTy kind, LValue &&lv, SILLocation loc)
: Kind(kind) {
assert(kind <= LastLVKindWithoutExtra &&
"this constructor should only be used for simple l-value kinds");
Value.emplace<LValueStorage>(Kind, std::move(lv), loc);
}
DelayedArgument(KindTy kind, ManagedValue rv, OriginalArgument original)
: Kind(kind), Original(original) {
Value.emplace<RValueStorage>(Kind, rv);
}
DelayedArgument(SILGenFunction::PointerAccessInfo pointerInfo,
LValue &&lv, SILLocation loc, OriginalArgument original)
: Kind(LValueToPointer), Original(original) {
Value.emplace<LValueStorage>(Kind, std::move(lv), loc);
Extra.emplace<PointerAccessInfo>(Kind, pointerInfo);
}
DelayedArgument(SILGenFunction::ArrayAccessInfo arrayInfo,
LValue &&lv, SILLocation loc, OriginalArgument original)
: Kind(LValueArrayToPointer), Original(original) {
Value.emplace<LValueStorage>(Kind, std::move(lv), loc);
Extra.emplace<ArrayAccessInfo>(Kind, arrayInfo);
}
DelayedArgument(KindTy kind,
SILGenFunction::ArrayAccessInfo arrayInfo,
ManagedValue rv, OriginalArgument original)
: Kind(kind), Original(original) {
Value.emplace<RValueStorage>(Kind, rv);
Extra.emplace<ArrayAccessInfo>(Kind, arrayInfo);
}
DelayedArgument(LValue &&lv, SILLocation loc,
AbstractionPattern origResultType,
ClaimedParamsRef params)
: Kind(BorrowedLValue) {
Value.emplaceAggregate<BorrowedLValueStorage>(Kind, std::move(lv), loc,
origResultType, params);
}
DelayedArgument(SILLocation loc,
ConcreteDeclRef defaultArgsOwner,
unsigned destIndex,
CanType resultType,
AbstractionPattern origResultType,
ClaimedParamsRef params,
SILFunctionTypeRepresentation functionTypeRepresentation)
: Kind(DefaultArgument) {
Value.emplace<DefaultArgumentStorage>(Kind, loc, defaultArgsOwner,
destIndex,
resultType,
origResultType, params,
functionTypeRepresentation);
}
DelayedArgument(DelayedArgument &&other)
: Kind(other.Kind), Original(other.Original) {
Value.moveConstruct(Kind, std::move(other.Value));
Extra.moveConstruct(Kind, std::move(other.Extra));
}
DelayedArgument &operator=(DelayedArgument &&other) {
Value.moveAssign(Kind, other.Kind, std::move(other.Value));
Extra.moveAssign(Kind, other.Kind, std::move(other.Extra));
Kind = other.Kind;
Original = other.Original;
return *this;
}
~DelayedArgument() {
Extra.destruct(Kind);
Value.destruct(Kind);
}
bool isSimpleInOut() const { return Kind == InOut; }
SILLocation getInOutLocation() const {
assert(isSimpleInOut());
return LV().Loc;
}
void emit(SILGenFunction &SGF, SmallVectorImpl<ManagedValue> &args,
size_t &argIndex) {
switch (Kind) {
case InOut:
args[argIndex++] = emitInOut(SGF);
return;
case LValueToPointer:
case LValueArrayToPointer:
case RValueArrayToPointer:
case RValueStringToPointer:
case FunctionConversion:
args[argIndex++] = finishOriginalArgument(SGF);
return;
case DefaultArgument:
emitDefaultArgument(SGF, Value.get<DefaultArgumentStorage>(Kind),
args, argIndex);
return;
case BorrowedLValue:
emitBorrowedLValue(SGF, Value.get<BorrowedLValueStorage>(Kind),
args, argIndex);
return;
}
llvm_unreachable("bad kind");
}
private:
ManagedValue emitInOut(SILGenFunction &SGF) {
return emitAddress(SGF, AccessKind::ReadWrite);
}
ManagedValue emitBorrowIndirect(SILGenFunction &SGF) {
return emitAddress(SGF, AccessKind::Read);
}
ManagedValue emitBorrowDirect(SILGenFunction &SGF) {
ManagedValue address = emitAddress(SGF, AccessKind::Read);
return SGF.B.createLoadBorrow(LV().Loc, address);
}
ManagedValue emitAddress(SILGenFunction &SGF, AccessKind accessKind) {
auto tsanKind =
(accessKind == AccessKind::Read ? TSanKind::None : TSanKind::InoutAccess);
return SGF.emitAddressOfLValue(LV().Loc, std::move(LV().LV), tsanKind);
}
/// Replay the original argument expression.
ManagedValue finishOriginalArgument(SILGenFunction &SGF) {
auto results = finishOriginalExpr(SGF, Original.getExpr());
auto value = results.first; // just let the owner go
if (Original.isIndirect() && !value.getType().isAddress()) {
value = value.materialize(SGF, Original.getExpr());
}
return value;
}
void emitDefaultArgument(SILGenFunction &SGF,
const DefaultArgumentStorage &info,
SmallVectorImpl<ManagedValue> &args,
size_t &argIndex);
void emitBorrowedLValue(SILGenFunction &SGF,
BorrowedLValueStorage &info,
SmallVectorImpl<ManagedValue> &args,
size_t &argIndex);
// (value, owner)
std::pair<ManagedValue, ManagedValue>
finishOriginalExpr(SILGenFunction &SGF, Expr *expr) {
// This needs to handle all of the recursive cases from
// ArgEmission::maybeEmitDelayed.
expr = expr->getSemanticsProvidingExpr();
// Handle injections into optionals.
if (auto inject = dyn_cast<InjectIntoOptionalExpr>(expr)) {
auto ownedValue =
finishOriginalExpr(SGF, inject->getSubExpr());
auto &optionalTL = SGF.getTypeLowering(expr->getType());
auto optValue = SGF.emitInjectOptional(inject, optionalTL, SGFContext(),
[&](SGFContext ctx) { return ownedValue.first; });
return {optValue, ownedValue.second};
}
// Handle try!.
if (auto forceTry = dyn_cast<ForceTryExpr>(expr)) {
// Handle throws from the accessor? But what if the writeback throws?
SILGenFunction::ForceTryEmission emission(SGF, forceTry);
return finishOriginalExpr(SGF, forceTry->getSubExpr());
}
// Handle optional evaluations.
if (auto optEval = dyn_cast<OptionalEvaluationExpr>(expr)) {
return finishOptionalEvaluation(SGF, optEval);
}
// Done with the recursive cases. Make sure we handled everything.
assert(isa<InOutToPointerExpr>(expr) ||
isa<ArrayToPointerExpr>(expr) ||
isa<StringToPointerExpr>(expr) ||
isa<FunctionConversionExpr>(expr));
switch (Kind) {
case InOut:
case BorrowedLValue:
case DefaultArgument:
llvm_unreachable("no original expr to finish in these cases");
case LValueToPointer:
return {SGF.emitLValueToPointer(LV().Loc, std::move(LV().LV),
Extra.get<PointerAccessInfo>(Kind)),
/*owner*/ ManagedValue()};
case LValueArrayToPointer:
return SGF.emitArrayToPointer(LV().Loc, std::move(LV().LV),
Extra.get<ArrayAccessInfo>(Kind));
case RValueArrayToPointer: {
auto pointerExpr = cast<ArrayToPointerExpr>(expr);
auto optArrayValue = RV().RV;
auto arrayValue = emitBindOptionals(SGF, optArrayValue,
pointerExpr->getSubExpr());
return SGF.emitArrayToPointer(pointerExpr, arrayValue,
Extra.get<ArrayAccessInfo>(Kind));
}
case RValueStringToPointer: {
auto pointerExpr = cast<StringToPointerExpr>(expr);
auto optStringValue = RV().RV;
auto stringValue =
emitBindOptionals(SGF, optStringValue, pointerExpr->getSubExpr());
return SGF.emitStringToPointer(pointerExpr, stringValue,
pointerExpr->getType());
}
case FunctionConversion: {
auto funcConv = cast<FunctionConversionExpr>(expr);
auto optFuncValue = RV().RV;
auto funcValue =
emitBindOptionals(SGF, optFuncValue, funcConv->getSubExpr());
return {SGF.emitTransformedValue(funcConv, funcValue,
funcConv->getSubExpr()->getType()->getCanonicalType(),
funcConv->getType()->getCanonicalType(),
SGFContext()),
ManagedValue()};
}
}
llvm_unreachable("bad kind");
}
ManagedValue emitBindOptionals(SILGenFunction &SGF, ManagedValue optValue,
Expr *expr) {
expr = expr->getSemanticsProvidingExpr();
auto bind = dyn_cast<BindOptionalExpr>(expr);
// If we don't find a bind, the value isn't optional.
if (!bind) return optValue;
// Recurse.
optValue = emitBindOptionals(SGF, optValue, bind->getSubExpr());
// Check whether the value is non-nil and if the value is not-nil, return
// the unwrapped value.
return SGF.emitBindOptional(bind, optValue, bind->getDepth());
}
std::pair<ManagedValue, ManagedValue>
finishOptionalEvaluation(SILGenFunction &SGF, OptionalEvaluationExpr *eval) {
SmallVector<ManagedValue, 2> results;
SGF.emitOptionalEvaluation(eval, eval->getType(), results, SGFContext(),
[&](SmallVectorImpl<ManagedValue> &results, SGFContext C) {
// Recurse.
auto values = finishOriginalExpr(SGF, eval->getSubExpr());
// Our primary result is the value.
results.push_back(values.first);
// Our secondary result is the owner, if we have one.
if (auto owner = values.second) results.push_back(owner);
});
assert(results.size() == 1 || results.size() == 2);
ManagedValue value = results[0];
ManagedValue owner;
if (results.size() == 2) {
owner = results[1];
// Create a new value-dependence here if the primary result is
// trivial.
auto &valueTL = SGF.getTypeLowering(value.getType());
if (valueTL.isTrivial()) {
SILValue dependentValue =
SGF.B.createMarkDependence(eval, value.forward(SGF),
owner.getValue());
value = SGF.emitManagedRValueWithCleanup(dependentValue, valueTL);
}
}
return {value, owner};
}
};
} // end anonymous namespace
/// Perform the formal-access phase of call argument emission by emitting
/// all of the delayed arguments.
static void emitDelayedArguments(SILGenFunction &SGF,
MutableArrayRef<DelayedArgument> delayedArgs,
MutableArrayRef<SmallVector<ManagedValue, 4>> args) {
assert(!delayedArgs.empty());
SmallVector<std::pair<SILValue, SILLocation>, 4> emittedInoutArgs;
auto delayedNext = delayedArgs.begin();
// The assumption we make is that 'args' and 'delayedArgs' were built
// up in parallel, with empty spots being dropped into 'args'
// wherever there's a delayed argument to insert.
//
// Note that this also begins the formal accesses in evaluation order.
for (auto &siteArgs : args) {
// NB: siteArgs.size() may change during iteration
for (size_t i = 0; i < siteArgs.size(); ) {
auto &siteArg = siteArgs[i];
if (siteArg) {
++i;
continue;
}
assert(delayedNext != delayedArgs.end());
auto &delayedArg = *delayedNext;
// Emit the delayed argument and replace it in the arguments array.
delayedArg.emit(SGF, siteArgs, i);
// Remember all the simple inouts we emitted so we can perform
// a basic inout-aliasing analysis.
// This should be completely obviated by static enforcement.
if (delayedArg.isSimpleInOut()) {
emittedInoutArgs.push_back({siteArg.getValue(),
delayedArg.getInOutLocation()});
}
if (++delayedNext == delayedArgs.end())
goto done;
}
}
llvm_unreachable("ran out of null arguments before we ran out of inouts");
done:
// Check to see if we have multiple inout arguments which obviously
// alias. Note that we could do this in a later SILDiagnostics pass
// as well: this would be stronger (more equivalences exposed) but
// would have worse source location information.
for (auto i = emittedInoutArgs.begin(), e = emittedInoutArgs.end();
i != e; ++i) {
for (auto j = emittedInoutArgs.begin(); j != i; ++j) {
if (!RValue::areObviouslySameValue(i->first, j->first)) continue;
SGF.SGM.diagnose(i->second, diag::inout_argument_alias)
.highlight(i->second.getSourceRange());
SGF.SGM.diagnose(j->second, diag::previous_inout_alias)
.highlight(j->second.getSourceRange());
}
}
}
static Expr *findStorageReferenceExprForBorrow(Expr *e) {
e = e->getSemanticsProvidingExpr();
// These are basically defined as the cases implemented by SILGenLValue.
// Direct storage references.
if (auto dre = dyn_cast<DeclRefExpr>(e)) {
if (isa<VarDecl>(dre->getDecl()))
return dre;
} else if (auto mre = dyn_cast<MemberRefExpr>(e)) {
if (isa<VarDecl>(mre->getDecl().getDecl()))
return mre;
} else if (isa<SubscriptExpr>(e)) {
return e;
} else if (isa<OpaqueValueExpr>(e)) {
return e;
} else if (isa<KeyPathApplicationExpr>(e)) {
return e;
// Transitive storage references. Look through these to see if the
// sub-expression is a storage reference, but don't return the
// sub-expression.
} else if (auto tue = dyn_cast<TupleElementExpr>(e)) {
if (findStorageReferenceExprForBorrow(tue->getBase()))
return tue;
} else if (auto fve = dyn_cast<ForceValueExpr>(e)) {
if (findStorageReferenceExprForBorrow(fve->getSubExpr()))
return fve;
} else if (auto boe = dyn_cast<BindOptionalExpr>(e)) {
if (findStorageReferenceExprForBorrow(boe->getSubExpr()))
return boe;
} else if (auto oe = dyn_cast<OpenExistentialExpr>(e)) {
if (findStorageReferenceExprForBorrow(oe->getExistentialValue()) &&
findStorageReferenceExprForBorrow(oe->getSubExpr()))
return oe;
} else if (auto bie = dyn_cast<DotSyntaxBaseIgnoredExpr>(e)) {
if (findStorageReferenceExprForBorrow(bie->getRHS()))
return bie;
} else if (auto te = dyn_cast<AnyTryExpr>(e)) {
if (findStorageReferenceExprForBorrow(te->getSubExpr()))
return te;
} else if (auto ioe = dyn_cast<InOutExpr>(e)) {
return ioe;
}
return nullptr;
}
Expr *ArgumentSource::findStorageReferenceExprForBorrow() && {
if (!isExpr()) return nullptr;
auto argExpr = asKnownExpr();
auto lvExpr = ::findStorageReferenceExprForBorrow(argExpr);
// Claim the value of this argument if we found a storage reference.
if (lvExpr) {
(void) std::move(*this).asKnownExpr();
}
return lvExpr;
}
namespace {
class ArgEmitter {
SILGenFunction &SGF;
SILFunctionTypeRepresentation Rep;
bool IsYield;
bool IsForCoroutine;
CalleeTypeInfo::ForeignInfo Foreign;
ClaimedParamsRef ParamInfos;
SmallVectorImpl<ManagedValue> &Args;
/// Track any delayed arguments that are emitted. Each corresponds
/// in order to a "hole" (a null value) in Args.
SmallVectorImpl<DelayedArgument> &DelayedArguments;
public:
ArgEmitter(SILGenFunction &SGF, SILFunctionTypeRepresentation Rep,
bool isYield, bool isForCoroutine, ClaimedParamsRef paramInfos,
SmallVectorImpl<ManagedValue> &args,
SmallVectorImpl<DelayedArgument> &delayedArgs,
const CalleeTypeInfo::ForeignInfo &foreign)
: SGF(SGF), Rep(Rep), IsYield(isYield), IsForCoroutine(isForCoroutine),
Foreign(foreign),
ParamInfos(paramInfos), Args(args), DelayedArguments(delayedArgs) {}
// origParamType is a parameter type.
void emitSingleArg(ArgumentSource &&arg, AbstractionPattern origParamType) {
// If this is delayed default argument, prepare to emit the default argument
// generator later.
if (arg.isDelayedDefaultArg()) {
auto substParamType = arg.getSubstRValueType();
auto defArg = std::move(arg).asKnownDefaultArg();
auto numParams = getFlattenedValueCount(origParamType,
substParamType,
ImportAsMemberStatus());
DelayedArguments.emplace_back(defArg,
defArg->getDefaultArgsOwner(),
defArg->getParamIndex(),
substParamType, origParamType,
claimNextParameters(numParams),
Rep);
Args.push_back(ManagedValue());
maybeEmitForeignArgument();
return;
}
emit(std::move(arg), origParamType);
maybeEmitForeignArgument();
}
// origFormalType is a function type.
void emitPreparedArgs(PreparedArguments &&args,
AbstractionPattern origFormalType) {
assert(args.isValid());
auto argSources = std::move(args).getSources();
maybeEmitForeignArgument();
for (auto i : indices(argSources)) {
emitSingleArg(std::move(argSources[i]),
origFormalType.getFunctionParamType(i));
}
}
private:
void emit(ArgumentSource &&arg, AbstractionPattern origParamType) {
if (!arg.hasLValueType()) {
// If the unsubstituted function type has a parameter of tuple type,
// explode the tuple value.
if (origParamType.isTuple()) {
emitExpanded(std::move(arg), origParamType);
return;
}
}
// Okay, everything else will be passed as a single value, one
// way or another.
// If this is a discarded foreign static 'self' parameter, force the
// argument and discard it.
if (Foreign.self.isStatic()) {
std::move(arg).getAsRValue(SGF);
return;
}
// Adjust for the foreign error or async argument if necessary.
maybeEmitForeignArgument();
// The substituted parameter type. Might be different from the
// substituted argument type by abstraction and/or bridging.
auto paramSlice = claimNextParameters(1);
SILParameterInfo param = paramSlice.front();
assert(arg.hasLValueType() == param.isIndirectInOut());
// Make sure we use the same value category for these so that we
// can hereafter just use simple equality checks to test for
// abstraction.
auto substArgType = arg.getSubstRValueType();
SILType loweredSubstArgType = SGF.getLoweredType(substArgType);
if (param.isIndirectInOut()) {
loweredSubstArgType =
SILType::getPrimitiveAddressType(loweredSubstArgType.getASTType());
}
SILType loweredSubstParamType = SILType::getPrimitiveType(
param.getInterfaceType(),
loweredSubstArgType.getCategory());
// If the caller takes the argument indirectly, the argument has an
// inout type.
if (param.isIndirectInOut()) {
emitInOut(std::move(arg), loweredSubstArgType, loweredSubstParamType,
origParamType, substArgType);