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Copy pathInstructionUtils.cpp
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InstructionUtils.cpp
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//===--- InstructionUtils.cpp - Utilities for SIL instructions ------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "sil-inst-utils"
#include "swift/SIL/InstructionUtils.h"
#include "swift/SIL/MemAccessUtils.h"
#include "swift/AST/SubstitutionMap.h"
#include "swift/Basic/Defer.h"
#include "swift/Basic/NullablePtr.h"
#include "swift/Basic/STLExtras.h"
#include "swift/SIL/DebugUtils.h"
#include "swift/SIL/Projection.h"
#include "swift/SIL/SILArgument.h"
#include "swift/SIL/SILBasicBlock.h"
#include "swift/SIL/SILBuilder.h"
#include "swift/SIL/SILVisitor.h"
using namespace swift;
SILValue swift::lookThroughOwnershipInsts(SILValue v) {
while (true) {
switch (v->getKind()) {
default:
return v;
case ValueKind::CopyValueInst:
case ValueKind::BeginBorrowInst:
v = cast<SingleValueInstruction>(v)->getOperand(0);
}
}
}
SILValue swift::lookThroughCopyValueInsts(SILValue val) {
while (auto *cvi =
dyn_cast_or_null<CopyValueInst>(val->getDefiningInstruction())) {
val = cvi->getOperand();
}
return val;
}
/// Strip off casts/indexing insts/address projections from V until there is
/// nothing left to strip.
///
/// FIXME: Why don't we strip projections after stripping indexes?
SILValue swift::getUnderlyingObject(SILValue v) {
while (true) {
SILValue v2 = stripCasts(v);
v2 = stripAddressProjections(v2);
v2 = stripIndexingInsts(v2);
v2 = lookThroughOwnershipInsts(v2);
if (v2 == v)
return v2;
v = v2;
}
}
/// Return the underlying SILValue after stripping off identity SILArguments if
/// we belong to a BB with one predecessor.
SILValue swift::stripSinglePredecessorArgs(SILValue V) {
while (true) {
auto *A = dyn_cast<SILArgument>(V);
if (!A)
return V;
SILBasicBlock *BB = A->getParent();
// First try and grab the single predecessor of our parent BB. If we don't
// have one, bail.
SILBasicBlock *Pred = BB->getSinglePredecessorBlock();
if (!Pred)
return V;
// Then grab the terminator of Pred...
TermInst *PredTI = Pred->getTerminator();
// And attempt to find our matching argument.
//
// *NOTE* We can only strip things here if we know that there is no semantic
// change in terms of upcasts/downcasts/enum extraction since this is used
// by other routines here. This means that we can only look through
// cond_br/br.
//
// For instance, routines that use stripUpcasts() do not want to strip off a
// downcast that results from checked_cast_br.
if (auto *BI = dyn_cast<BranchInst>(PredTI)) {
V = BI->getArg(A->getIndex());
continue;
}
if (auto *CBI = dyn_cast<CondBranchInst>(PredTI)) {
if (SILValue Arg = CBI->getArgForDestBB(BB, A)) {
V = Arg;
continue;
}
}
return V;
}
}
SILValue swift::stripCastsWithoutMarkDependence(SILValue v) {
while (true) {
v = stripSinglePredecessorArgs(v);
if (isa<MarkDependenceInst>(v))
return v;
if (auto *svi = dyn_cast<SingleValueInstruction>(v)) {
if (isIdentityPreservingRefCast(svi) ||
isa<UncheckedTrivialBitCastInst>(v) || isa<BeginAccessInst>(v) ||
isa<EndCOWMutationInst>(v)) {
v = svi->getOperand(0);
continue;
}
}
return v;
}
}
SILValue swift::stripCasts(SILValue v) {
while (true) {
v = stripSinglePredecessorArgs(v);
if (auto *svi = dyn_cast<SingleValueInstruction>(v)) {
if (isIdentityPreservingRefCast(svi) ||
isa<UncheckedTrivialBitCastInst>(v) || isa<MarkDependenceInst>(v) ||
isa<BeginAccessInst>(v)) {
v = cast<SingleValueInstruction>(v)->getOperand(0);
continue;
}
}
SILValue v2 = lookThroughOwnershipInsts(v);
if (v2 != v) {
v = v2;
continue;
}
return v;
}
}
SILValue swift::stripUpCasts(SILValue v) {
assert(v->getType().isClassOrClassMetatype() &&
"Expected class or class metatype!");
v = stripSinglePredecessorArgs(v);
while (true) {
if (auto *ui = dyn_cast<UpcastInst>(v)) {
v = ui->getOperand();
continue;
}
SILValue v2 = stripSinglePredecessorArgs(v);
v2 = lookThroughOwnershipInsts(v2);
if (v2 == v) {
return v2;
}
v = v2;
}
}
SILValue swift::stripClassCasts(SILValue v) {
while (true) {
if (auto *ui = dyn_cast<UpcastInst>(v)) {
v = ui->getOperand();
continue;
}
if (auto *ucci = dyn_cast<UnconditionalCheckedCastInst>(v)) {
v = ucci->getOperand();
continue;
}
SILValue v2 = lookThroughOwnershipInsts(v);
if (v2 != v) {
v = v2;
continue;
}
return v;
}
}
SILValue swift::stripAddressProjections(SILValue V) {
while (true) {
V = stripSinglePredecessorArgs(V);
if (!Projection::isAddressProjection(V))
return V;
V = cast<SingleValueInstruction>(V)->getOperand(0);
}
}
SILValue swift::lookThroughAddressToAddressProjections(SILValue v) {
while (true) {
v = stripSinglePredecessorArgs(v);
if (!Projection::isAddressToAddressProjection(v))
return v;
v = cast<SingleValueInstruction>(v)->getOperand(0);
}
}
SILValue swift::stripValueProjections(SILValue V) {
while (true) {
V = stripSinglePredecessorArgs(V);
if (!Projection::isObjectProjection(V))
return V;
V = cast<SingleValueInstruction>(V)->getOperand(0);
}
}
SILValue swift::stripIndexingInsts(SILValue V) {
while (true) {
if (!isa<IndexingInst>(V))
return V;
V = cast<IndexingInst>(V)->getBase();
}
}
SILValue swift::stripExpectIntrinsic(SILValue V) {
auto *BI = dyn_cast<BuiltinInst>(V);
if (!BI)
return V;
if (BI->getIntrinsicInfo().ID != llvm::Intrinsic::expect)
return V;
return BI->getArguments()[0];
}
SILValue swift::stripBorrow(SILValue V) {
if (auto *BBI = dyn_cast<BeginBorrowInst>(V))
return BBI->getOperand();
return V;
}
// All instructions handled here must propagate their first operand into their
// single result.
//
// This is guaranteed to handle all function-type conversions: ThinToThick,
// ConvertFunction, and ConvertEscapeToNoEscapeInst.
SingleValueInstruction *swift::getSingleValueCopyOrCast(SILInstruction *I) {
if (auto *convert = dyn_cast<ConversionInst>(I))
return convert;
switch (I->getKind()) {
default:
return nullptr;
case SILInstructionKind::CopyValueInst:
case SILInstructionKind::CopyBlockInst:
case SILInstructionKind::CopyBlockWithoutEscapingInst:
case SILInstructionKind::BeginBorrowInst:
case SILInstructionKind::BeginAccessInst:
case SILInstructionKind::MarkDependenceInst:
return cast<SingleValueInstruction>(I);
}
}
// Does this instruction terminate a SIL-level scope?
bool swift::isEndOfScopeMarker(SILInstruction *user) {
switch (user->getKind()) {
default:
return false;
case SILInstructionKind::EndAccessInst:
case SILInstructionKind::EndBorrowInst:
return true;
}
}
bool swift::isIncidentalUse(SILInstruction *user) {
return isEndOfScopeMarker(user) || user->isDebugInstruction() ||
isa<FixLifetimeInst>(user) || isa<EndLifetimeInst>(user);
}
bool swift::onlyAffectsRefCount(SILInstruction *user) {
switch (user->getKind()) {
default:
return false;
case SILInstructionKind::AutoreleaseValueInst:
case SILInstructionKind::DestroyValueInst:
case SILInstructionKind::ReleaseValueInst:
case SILInstructionKind::RetainValueInst:
case SILInstructionKind::StrongReleaseInst:
case SILInstructionKind::StrongRetainInst:
case SILInstructionKind::UnmanagedAutoreleaseValueInst:
#define UNCHECKED_REF_STORAGE(Name, ...) \
case SILInstructionKind::Name##RetainValueInst: \
case SILInstructionKind::Name##ReleaseValueInst: \
case SILInstructionKind::StrongCopy##Name##ValueInst:
#define ALWAYS_OR_SOMETIMES_LOADABLE_CHECKED_REF_STORAGE(Name, ...) \
case SILInstructionKind::Name##RetainInst: \
case SILInstructionKind::Name##ReleaseInst: \
case SILInstructionKind::StrongRetain##Name##Inst: \
case SILInstructionKind::StrongCopy##Name##ValueInst:
#include "swift/AST/ReferenceStorage.def"
return true;
}
}
bool swift::mayCheckRefCount(SILInstruction *User) {
return isa<IsUniqueInst>(User) || isa<IsEscapingClosureInst>(User) ||
isa<BeginCOWMutationInst>(User);
}
bool swift::isSanitizerInstrumentation(SILInstruction *Instruction) {
auto *BI = dyn_cast<BuiltinInst>(Instruction);
if (!BI)
return false;
Identifier Name = BI->getName();
if (Name == BI->getModule().getASTContext().getIdentifier("tsanInoutAccess"))
return true;
return false;
}
// Instrumentation instructions should not affect the correctness of the
// program. That is, they should not affect the observable program state.
// The constant evaluator relies on this property to skip instructions.
bool swift::isInstrumentation(SILInstruction *Instruction) {
if (isSanitizerInstrumentation(Instruction))
return true;
if (BuiltinInst *bi = dyn_cast<BuiltinInst>(Instruction)) {
if (bi->getBuiltinKind() == BuiltinValueKind::IntInstrprofIncrement)
return true;
}
return false;
}
SILValue swift::isPartialApplyOfReabstractionThunk(PartialApplyInst *PAI) {
// A partial_apply of a reabstraction thunk either has a single capture
// (a function) or two captures (function and dynamic Self type).
if (PAI->getNumArguments() != 1 &&
PAI->getNumArguments() != 2)
return SILValue();
auto *Fun = PAI->getReferencedFunctionOrNull();
if (!Fun)
return SILValue();
// Make sure we have a reabstraction thunk.
if (Fun->isThunk() != IsReabstractionThunk)
return SILValue();
// The argument should be a closure.
auto Arg = PAI->getArgument(0);
if (!Arg->getType().is<SILFunctionType>() ||
(!Arg->getType().isReferenceCounted(PAI->getFunction()->getModule()) &&
Arg->getType().getAs<SILFunctionType>()->getRepresentation() !=
SILFunctionType::Representation::Thick))
return SILValue();
return Arg;
}
bool swift::onlyUsedByAssignByWrapper(PartialApplyInst *PAI) {
bool usedByAssignByWrapper = false;
for (Operand *Op : PAI->getUses()) {
SILInstruction *User = Op->getUser();
if (isa<AssignByWrapperInst>(User) && Op->getOperandNumber() >= 2) {
usedByAssignByWrapper = true;
continue;
}
if (isa<DestroyValueInst>(User))
continue;
return false;
}
return usedByAssignByWrapper;
}
static RuntimeEffect metadataEffect(SILType ty) {
ClassDecl *cl = ty.getClassOrBoundGenericClass();
if (cl && !cl->hasKnownSwiftImplementation())
return RuntimeEffect::MetaData | RuntimeEffect::ObjectiveC;
return RuntimeEffect::MetaData;
}
RuntimeEffect swift::getRuntimeEffect(SILInstruction *inst, SILType &impactType) {
switch (inst->getKind()) {
case SILInstructionKind::TailAddrInst:
case SILInstructionKind::IndexRawPointerInst:
case SILInstructionKind::FunctionRefInst:
case SILInstructionKind::DynamicFunctionRefInst:
case SILInstructionKind::PreviousDynamicFunctionRefInst:
case SILInstructionKind::GlobalAddrInst:
case SILInstructionKind::BaseAddrForOffsetInst:
case SILInstructionKind::IntegerLiteralInst:
case SILInstructionKind::FloatLiteralInst:
case SILInstructionKind::StringLiteralInst:
case SILInstructionKind::ClassMethodInst:
case SILInstructionKind::ObjCMethodInst:
case SILInstructionKind::ObjCSuperMethodInst:
case SILInstructionKind::UpcastInst:
case SILInstructionKind::AddressToPointerInst:
case SILInstructionKind::PointerToAddressInst:
case SILInstructionKind::UncheckedRefCastInst:
case SILInstructionKind::UncheckedAddrCastInst:
case SILInstructionKind::UncheckedTrivialBitCastInst:
case SILInstructionKind::UncheckedBitwiseCastInst:
case SILInstructionKind::UncheckedValueCastInst:
case SILInstructionKind::RefToRawPointerInst:
case SILInstructionKind::RawPointerToRefInst:
#define LOADABLE_REF_STORAGE(Name, ...) \
case SILInstructionKind::RefTo##Name##Inst: \
case SILInstructionKind::Name##ToRefInst:
#include "swift/AST/ReferenceStorage.def"
#undef LOADABLE_REF_STORAGE_HELPER
case SILInstructionKind::ConvertFunctionInst:
case SILInstructionKind::ConvertEscapeToNoEscapeInst:
case SILInstructionKind::RefToBridgeObjectInst:
case SILInstructionKind::BridgeObjectToRefInst:
case SILInstructionKind::BridgeObjectToWordInst:
case SILInstructionKind::ThinToThickFunctionInst:
case SILInstructionKind::ThickToObjCMetatypeInst:
case SILInstructionKind::ObjCMetatypeToObjectInst:
case SILInstructionKind::ObjCExistentialMetatypeToObjectInst:
case SILInstructionKind::ClassifyBridgeObjectInst:
case SILInstructionKind::ValueToBridgeObjectInst:
case SILInstructionKind::MarkDependenceInst:
case SILInstructionKind::MoveValueInst:
case SILInstructionKind::MarkMustCheckInst:
case SILInstructionKind::CopyableToMoveOnlyWrapperValueInst:
case SILInstructionKind::MoveOnlyWrapperToCopyableValueInst:
case SILInstructionKind::UncheckedOwnershipConversionInst:
case SILInstructionKind::LoadInst:
case SILInstructionKind::LoadBorrowInst:
case SILInstructionKind::BeginBorrowInst:
case SILInstructionKind::StoreBorrowInst:
case SILInstructionKind::MarkUninitializedInst:
case SILInstructionKind::ProjectExistentialBoxInst:
case SILInstructionKind::ObjCProtocolInst:
case SILInstructionKind::ObjectInst:
case SILInstructionKind::TupleInst:
case SILInstructionKind::TupleExtractInst:
case SILInstructionKind::StructInst:
case SILInstructionKind::StructExtractInst:
case SILInstructionKind::RefElementAddrInst:
case SILInstructionKind::EnumInst:
case SILInstructionKind::UncheckedEnumDataInst:
case SILInstructionKind::InitEnumDataAddrInst:
case SILInstructionKind::UncheckedTakeEnumDataAddrInst:
case SILInstructionKind::SelectEnumInst:
case SILInstructionKind::SelectEnumAddrInst:
case SILInstructionKind::SelectValueInst:
case SILInstructionKind::OpenExistentialMetatypeInst:
case SILInstructionKind::OpenExistentialBoxInst:
case SILInstructionKind::OpenExistentialValueInst:
case SILInstructionKind::OpenExistentialBoxValueInst:
case SILInstructionKind::ProjectBlockStorageInst:
case SILInstructionKind::UnreachableInst:
case SILInstructionKind::ReturnInst:
case SILInstructionKind::ThrowInst:
case SILInstructionKind::YieldInst:
case SILInstructionKind::UnwindInst:
case SILInstructionKind::BranchInst:
case SILInstructionKind::CondBranchInst:
case SILInstructionKind::SwitchValueInst:
case SILInstructionKind::SwitchEnumInst:
case SILInstructionKind::DeallocStackInst:
case SILInstructionKind::DeallocStackRefInst:
case SILInstructionKind::AutoreleaseValueInst:
case SILInstructionKind::BindMemoryInst:
case SILInstructionKind::RebindMemoryInst:
case SILInstructionKind::FixLifetimeInst:
case SILInstructionKind::EndBorrowInst:
case SILInstructionKind::AssignInst:
case SILInstructionKind::AssignByWrapperInst:
case SILInstructionKind::MarkFunctionEscapeInst:
case SILInstructionKind::EndLifetimeInst:
case SILInstructionKind::EndApplyInst:
case SILInstructionKind::AbortApplyInst:
case SILInstructionKind::CondFailInst:
case SILInstructionKind::DestructureStructInst:
case SILInstructionKind::DestructureTupleInst:
case SILInstructionKind::DifferentiableFunctionInst:
case SILInstructionKind::DifferentiableFunctionExtractInst:
case SILInstructionKind::LinearFunctionInst:
case SILInstructionKind::LinearFunctionExtractInst:
case SILInstructionKind::DifferentiabilityWitnessFunctionInst:
case SILInstructionKind::EndCOWMutationInst:
return RuntimeEffect::NoEffect;
case SILInstructionKind::DebugValueInst:
// Ignore runtime calls of debug_value
return RuntimeEffect::NoEffect;
case SILInstructionKind::GetAsyncContinuationInst:
case SILInstructionKind::GetAsyncContinuationAddrInst:
case SILInstructionKind::AwaitAsyncContinuationInst:
case SILInstructionKind::HopToExecutorInst:
case SILInstructionKind::ExtractExecutorInst:
return RuntimeEffect::Concurrency;
case SILInstructionKind::KeyPathInst:
return RuntimeEffect::Allocating | RuntimeEffect::Releasing |
RuntimeEffect::MetaData;
case SILInstructionKind::SwitchEnumAddrInst:
case SILInstructionKind::InjectEnumAddrInst:
case SILInstructionKind::TupleElementAddrInst:
case SILInstructionKind::StructElementAddrInst:
case SILInstructionKind::IndexAddrInst:
// TODO: hasArchetype() ?
if (!inst->getOperand(0)->getType().isLoadable(*inst->getFunction())) {
impactType = inst->getOperand(0)->getType();
return RuntimeEffect::MetaData;
}
return RuntimeEffect::NoEffect;
case SILInstructionKind::RefTailAddrInst:
if (!cast<RefTailAddrInst>(inst)->getTailType().isLoadable(*inst->getFunction())) {
impactType = cast<RefTailAddrInst>(inst)->getTailType();
return RuntimeEffect::MetaData;
}
return RuntimeEffect::NoEffect;
case SILInstructionKind::BeginAccessInst:
if (cast<BeginAccessInst>(inst)->getEnforcement() ==
SILAccessEnforcement::Dynamic)
return RuntimeEffect::ExclusivityChecking;
return RuntimeEffect::NoEffect;
case SILInstructionKind::EndAccessInst:
if (cast<EndAccessInst>(inst)->getBeginAccess()->getEnforcement() ==
SILAccessEnforcement::Dynamic)
return RuntimeEffect::ExclusivityChecking;
return RuntimeEffect::NoEffect;
case SILInstructionKind::BeginUnpairedAccessInst:
if (cast<BeginUnpairedAccessInst>(inst)->getEnforcement() ==
SILAccessEnforcement::Dynamic)
return RuntimeEffect::ExclusivityChecking;
return RuntimeEffect::NoEffect;
case SILInstructionKind::EndUnpairedAccessInst:
if (cast<EndUnpairedAccessInst>(inst)->getEnforcement() ==
SILAccessEnforcement::Dynamic)
return RuntimeEffect::ExclusivityChecking;
return RuntimeEffect::NoEffect;
case SILInstructionKind::InitExistentialAddrInst:
case SILInstructionKind::InitExistentialValueInst:
impactType = inst->getOperand(0)->getType();
return RuntimeEffect::Allocating | RuntimeEffect::Releasing |
RuntimeEffect::MetaData;
case SILInstructionKind::InitExistentialRefInst:
case SILInstructionKind::InitExistentialMetatypeInst:
case SILInstructionKind::ObjCToThickMetatypeInst:
impactType = inst->getOperand(0)->getType();
return RuntimeEffect::MetaData;
case SILInstructionKind::OpenExistentialAddrInst:
if (cast<OpenExistentialAddrInst>(inst)->getAccessKind() ==
OpenedExistentialAccess::Mutable)
return RuntimeEffect::Allocating;
return RuntimeEffect::NoEffect;
case SILInstructionKind::OpenExistentialRefInst: {
SILType opType = cast<OpenExistentialRefInst>(inst)->getOperand()->getType();
impactType = opType;
if (opType.getASTType()->isObjCExistentialType()) {
return RuntimeEffect::MetaData;
}
return RuntimeEffect::MetaData;
// TODO: should be NoEffect
//return RuntimeEffect::NoEffect;
}
case SILInstructionKind::UnconditionalCheckedCastInst:
impactType = inst->getOperand(0)->getType();
return RuntimeEffect::Casting | metadataEffect(impactType) |
metadataEffect(cast<SingleValueInstruction>(inst)->getType());
case SILInstructionKind::UnconditionalCheckedCastAddrInst:
case SILInstructionKind::CheckedCastAddrBranchInst:
case SILInstructionKind::UncheckedRefCastAddrInst:
impactType = inst->getOperand(0)->getType();
return RuntimeEffect::Casting | metadataEffect(impactType) |
metadataEffect(inst->getOperand(1)->getType());
case SILInstructionKind::CheckedCastBranchInst:
impactType = inst->getOperand(0)->getType();
return RuntimeEffect::Casting | metadataEffect(impactType) |
metadataEffect(cast<CheckedCastBranchInst>(inst)->getTargetLoweredType());
case SILInstructionKind::AllocStackInst:
case SILInstructionKind::ProjectBoxInst:
if (!cast<SingleValueInstruction>(inst)->getType().
isLoadable(*inst->getFunction())) {
impactType = cast<SingleValueInstruction>(inst)->getType();
return RuntimeEffect::MetaData;
}
return RuntimeEffect::NoEffect;
case SILInstructionKind::AllocGlobalInst: {
SILType glTy = cast<AllocGlobalInst>(inst)->getReferencedGlobal()->
getLoweredType();
if (glTy.isLoadable(*inst->getFunction()))
return RuntimeEffect::NoEffect;
if (glTy.hasOpaqueArchetype()) {
impactType = glTy;
return RuntimeEffect::Allocating | RuntimeEffect::MetaData;
}
return RuntimeEffect::Allocating;
}
case SILInstructionKind::AllocBoxInst:
case SILInstructionKind::AllocExistentialBoxInst:
case SILInstructionKind::AllocRefInst:
case SILInstructionKind::AllocRefDynamicInst:
impactType = cast<SingleValueInstruction>(inst)->getType();
return RuntimeEffect::Allocating | RuntimeEffect::MetaData |
// TODO: why Releasing?
RuntimeEffect::Releasing;
case SILInstructionKind::DeallocRefInst:
case SILInstructionKind::DeallocPartialRefInst:
case SILInstructionKind::DeallocBoxInst:
case SILInstructionKind::DeallocExistentialBoxInst:
case SILInstructionKind::DeinitExistentialAddrInst:
case SILInstructionKind::DeinitExistentialValueInst:
return RuntimeEffect::Deallocating;
case SILInstructionKind::CopyAddrInst: {
auto *ca = cast<CopyAddrInst>(inst);
impactType = ca->getSrc()->getType();
if (!ca->isInitializationOfDest())
return RuntimeEffect::MetaData | RuntimeEffect::Releasing;
if (!ca->isTakeOfSrc())
return RuntimeEffect::MetaData | RuntimeEffect::RefCounting;
return RuntimeEffect::MetaData;
}
case SILInstructionKind::ExplicitCopyAddrInst: {
auto *ca = cast<ExplicitCopyAddrInst>(inst);
impactType = ca->getSrc()->getType();
if (!ca->isInitializationOfDest())
return RuntimeEffect::MetaData | RuntimeEffect::Releasing;
if (!ca->isTakeOfSrc())
return RuntimeEffect::MetaData | RuntimeEffect::RefCounting;
return RuntimeEffect::MetaData;
}
// Equivalent to a copy_addr [init]
case SILInstructionKind::MarkUnresolvedMoveAddrInst: {
return RuntimeEffect::MetaData | RuntimeEffect::RefCounting;
}
case SILInstructionKind::StoreInst:
switch (cast<StoreInst>(inst)->getOwnershipQualifier()) {
case StoreOwnershipQualifier::Unqualified:
case StoreOwnershipQualifier::Trivial:
return RuntimeEffect::NoEffect;
case StoreOwnershipQualifier::Init:
return RuntimeEffect::RefCounting;
case StoreOwnershipQualifier::Assign:
return RuntimeEffect::Releasing;
}
case SILInstructionKind::DestroyAddrInst:
impactType = inst->getOperand(0)->getType();
if (impactType.isTrivial(*inst->getFunction()))
return RuntimeEffect::NoEffect;
if (!impactType.isLoadable(*inst->getFunction()))
return RuntimeEffect::Releasing | RuntimeEffect::MetaData;
return RuntimeEffect::Releasing;
case SILInstructionKind::ValueMetatypeInst:
case SILInstructionKind::MetatypeInst: {
auto metaTy = cast<SingleValueInstruction>(inst)->getType().castTo<MetatypeType>();
if (metaTy->getRepresentation() != MetatypeRepresentation::Thin) {
Type instTy = metaTy->getInstanceType();
if (instTy->isLegalSILType())
impactType = SILType::getPrimitiveObjectType(CanType(instTy));
if (auto selfType = instTy->getAs<DynamicSelfType>())
instTy = selfType->getSelfType();
auto *cl = instTy->getClassOrBoundGenericClass();
bool isForeign = cl && (cl->getObjectModel() == ReferenceCounting::ObjC ||
cl->isForeign());
if (isForeign || instTy->isAnyObject())
return RuntimeEffect::MetaData | RuntimeEffect::ObjectiveC;
return RuntimeEffect::MetaData;
}
return RuntimeEffect::NoEffect;
}
case SILInstructionKind::ExistentialMetatypeInst: {
SILType opType = cast<ExistentialMetatypeInst>(inst)->getOperand()->getType();
impactType = opType;
switch (opType.getPreferredExistentialRepresentation()) {
case ExistentialRepresentation::Metatype:
case ExistentialRepresentation::Boxed:
case ExistentialRepresentation::Opaque:
return RuntimeEffect::MetaData;
case ExistentialRepresentation::Class: {
auto *cl = opType.getClassOrBoundGenericClass();
bool usesObjCModel = cl->getObjectModel() == ReferenceCounting::ObjC;
if ((cl && usesObjCModel) || opType.isAnyObject())
return RuntimeEffect::MetaData | RuntimeEffect::ObjectiveC;
return RuntimeEffect::MetaData | RuntimeEffect::ObjectiveC;
}
case ExistentialRepresentation::None:
return RuntimeEffect::NoEffect;
}
llvm_unreachable("Bad existential representation");
}
case SILInstructionKind::StrongRetainInst:
case SILInstructionKind::UnmanagedRetainValueInst:
case SILInstructionKind::RetainValueAddrInst:
case SILInstructionKind::RetainValueInst:
case SILInstructionKind::BeginCOWMutationInst:
case SILInstructionKind::CopyValueInst:
case SILInstructionKind::ExplicitCopyValueInst:
case SILInstructionKind::SetDeallocatingInst:
case SILInstructionKind::IsUniqueInst:
case SILInstructionKind::IsEscapingClosureInst:
case SILInstructionKind::CopyBlockInst:
case SILInstructionKind::CopyBlockWithoutEscapingInst:
return RuntimeEffect::RefCounting;
case SILInstructionKind::InitBlockStorageHeaderInst:
return RuntimeEffect::Releasing;
case SILInstructionKind::StrongReleaseInst:
case SILInstructionKind::UnmanagedReleaseValueInst:
case SILInstructionKind::UnmanagedAutoreleaseValueInst:
case SILInstructionKind::ReleaseValueInst:
case SILInstructionKind::ReleaseValueAddrInst:
case SILInstructionKind::DestroyValueInst:
impactType = inst->getOperand(0)->getType();
if (impactType.isBlockPointerCompatible())
return RuntimeEffect::ObjectiveC | RuntimeEffect::Releasing;
return RuntimeEffect::Releasing;
#define ALWAYS_OR_SOMETIMES_LOADABLE_CHECKED_REF_STORAGE(Name, ...) \
case SILInstructionKind::StrongRetain##Name##Inst: \
case SILInstructionKind::Name##RetainInst: \
return RuntimeEffect::RefCounting; \
case SILInstructionKind::Name##ReleaseInst: \
return RuntimeEffect::Releasing;
#include "swift/AST/ReferenceStorage.def"
#undef ALWAYS_OR_SOMETIMES_LOADABLE_CHECKED_REF_STORAGE
#define UNCHECKED_REF_STORAGE(Name, ...) \
case SILInstructionKind::StrongCopy##Name##ValueInst: \
return RuntimeEffect::RefCounting;
#define ALWAYS_OR_SOMETIMES_LOADABLE_CHECKED_REF_STORAGE(Name, ...) \
case SILInstructionKind::StrongCopy##Name##ValueInst: \
return RuntimeEffect::RefCounting;
#include "swift/AST/ReferenceStorage.def"
#undef UNCHECKED_REF_STORAGE
#undef ALWAYS_OR_SOMETIMES_LOADABLE_CHECKED_REF_STORAGE
#define NEVER_OR_SOMETIMES_LOADABLE_CHECKED_REF_STORAGE(Name, ...) \
case SILInstructionKind::Store##Name##Inst: \
return RuntimeEffect::Releasing;
#include "swift/AST/ReferenceStorage.def"
#undef NEVER_OR_SOMETIMES_LOADABLE_CHECKED_REF_STORAGE
#define NEVER_OR_SOMETIMES_LOADABLE_CHECKED_REF_STORAGE(Name, name, ...) \
case SILInstructionKind::Load##Name##Inst: \
return RuntimeEffect::RefCounting;
#include "swift/AST/ReferenceStorage.def"
#undef NEVER_OR_SOMETIMES_LOADABLE_CHECKED_REF_STORAGE
case SILInstructionKind::GlobalValueInst:
return RuntimeEffect::Locking | RuntimeEffect::MetaData;
case SILInstructionKind::DynamicMethodBranchInst:
return RuntimeEffect::ObjectiveC;
case SILInstructionKind::PartialApplyInst:
case SILInstructionKind::ApplyInst:
case SILInstructionKind::TryApplyInst:
case SILInstructionKind::BeginApplyInst: {
RuntimeEffect rt = RuntimeEffect::NoEffect;
auto as = ApplySite(inst);
switch (as.getSubstCalleeType()->getRepresentation()) {
case SILFunctionTypeRepresentation::ObjCMethod:
case SILFunctionTypeRepresentation::Block:
rt |= RuntimeEffect::ObjectiveC | RuntimeEffect::MetaData;
break;
case SILFunctionTypeRepresentation::WitnessMethod:
rt |= RuntimeEffect::MetaData;
break;
case SILFunctionTypeRepresentation::CFunctionPointer:
case SILFunctionTypeRepresentation::CXXMethod:
case SILFunctionTypeRepresentation::Thin:
case SILFunctionTypeRepresentation::Method:
case SILFunctionTypeRepresentation::Closure:
case SILFunctionTypeRepresentation::Thick:
break;
}
if (isa<BeginApplyInst>(inst))
rt |= RuntimeEffect::Allocating;
if (auto *pa = dyn_cast<PartialApplyInst>(inst)) {
if (pa->isOnStack()) {
for (SILValue arg : pa->getArguments()) {
if (!arg->getType().isTrivial(*pa->getFunction()))
rt |= RuntimeEffect::RefCounting;
}
} else {
rt |= RuntimeEffect::Allocating | RuntimeEffect::Releasing;
}
}
if (!as.getSubstitutionMap().empty())
rt |= RuntimeEffect::MetaData;
if (auto *pa = dyn_cast<PartialApplyInst>(inst)) {
if (!pa->isOnStack())
rt |= RuntimeEffect::MetaData;
}
return rt;
}
case SILInstructionKind::WitnessMethodInst: {
return RuntimeEffect::MetaData;
}
case SILInstructionKind::SuperMethodInst: {
auto method = cast<SuperMethodInst>(inst)->getMember().getOverriddenVTableEntry();
auto *classDecl = cast<ClassDecl>(method.getDecl()->getDeclContext());
if (classDecl->hasResilientMetadata())
return RuntimeEffect::MetaData;
return RuntimeEffect::NoEffect;
}
case SILInstructionKind::BuiltinInst:
switch (cast<BuiltinInst>(inst)->getBuiltinInfo().ID) {
case BuiltinValueKind::Once:
case BuiltinValueKind::OnceWithContext:
return RuntimeEffect::Locking;
case BuiltinValueKind::IsUnique:
return RuntimeEffect::RefCounting;
case BuiltinValueKind::IsOptionalType:
return RuntimeEffect::Casting;
case BuiltinValueKind::AllocRaw:
return RuntimeEffect::Allocating;
case BuiltinValueKind::DeallocRaw:
return RuntimeEffect::Deallocating;
case BuiltinValueKind::Fence:
case BuiltinValueKind::CmpXChg:
case BuiltinValueKind::AtomicLoad:
case BuiltinValueKind::AtomicStore:
case BuiltinValueKind::AtomicRMW:
return RuntimeEffect::Locking;
case BuiltinValueKind::DestroyArray:
return RuntimeEffect::Releasing;
case BuiltinValueKind::CopyArray:
return RuntimeEffect::RefCounting;
case BuiltinValueKind::AssignCopyArrayNoAlias:
case BuiltinValueKind::AssignCopyArrayFrontToBack:
case BuiltinValueKind::AssignCopyArrayBackToFront:
case BuiltinValueKind::AssignTakeArray:
return RuntimeEffect::RefCounting | RuntimeEffect::Deallocating;
case BuiltinValueKind::Swift3ImplicitObjCEntrypoint:
return RuntimeEffect::ObjectiveC | RuntimeEffect::Allocating;
case BuiltinValueKind::BuildOrdinarySerialExecutorRef:
case BuiltinValueKind::BuildDefaultActorExecutorRef:
case BuiltinValueKind::BuildMainActorExecutorRef:
case BuiltinValueKind::StartAsyncLet:
case BuiltinValueKind::StartAsyncLetWithLocalBuffer:
return RuntimeEffect::MetaData;
default:
break;
}
return RuntimeEffect::NoEffect;
}
}
/// Given a block used as a noescape function argument, attempt to find all
/// Swift closures that invoking the block will call. The StoredClosures may not
/// actually be partial_apply instructions. They may be copied, block arguments,
/// or conversions. The caller must continue searching up the use-def chain.
static SILValue findClosureStoredIntoBlock(SILValue V) {
auto FnType = V->getType().castTo<SILFunctionType>();
assert(FnType->getRepresentation() == SILFunctionTypeRepresentation::Block);
(void)FnType;
// Given a no escape block argument to a function,
// pattern match to find the noescape closure that invoking the block
// will call:
// %noescape_closure = ...
// %wae_Thunk = function_ref @$withoutActuallyEscapingThunk
// %sentinel =
// partial_apply [callee_guaranteed] %wae_thunk(%noescape_closure)
// %noescaped_wrapped = mark_dependence %sentinel on %noescape_closure
// %storage = alloc_stack
// %storage_address = project_block_storage %storage
// store %noescaped_wrapped to [init] %storage_address
// %block = init_block_storage_header %storage invoke %thunk
// %arg = copy_block %block
InitBlockStorageHeaderInst *IBSHI = dyn_cast<InitBlockStorageHeaderInst>(V);
if (!IBSHI)
return nullptr;
SILValue BlockStorage = IBSHI->getBlockStorage();
auto *PBSI = BlockStorage->getSingleUserOfType<ProjectBlockStorageInst>();
assert(PBSI && "Couldn't find block storage projection");
auto *SI = PBSI->getSingleUserOfType<StoreInst>();
assert(SI && "Couldn't find single store of function into block storage");
auto *CV = dyn_cast<CopyValueInst>(SI->getSrc());
if (!CV)
return nullptr;
auto *WrappedNoEscape = dyn_cast<MarkDependenceInst>(CV->getOperand());
if (!WrappedNoEscape)
return nullptr;
auto Sentinel = dyn_cast<PartialApplyInst>(WrappedNoEscape->getValue());
if (!Sentinel)
return nullptr;
auto NoEscapeClosure = isPartialApplyOfReabstractionThunk(Sentinel);
if (WrappedNoEscape->getBase() != NoEscapeClosure)
return nullptr;
// This is the value of the closure to be invoked. To find the partial_apply
// itself, the caller must search the use-def chain.
return NoEscapeClosure;
}
/// Find all closures that may be propagated into the given function-type value.
///
/// Searches the use-def chain from the given value upward until a partial_apply
/// is reached. Populates `results` with the set of partial_apply instructions.
///
/// `funcVal` may be either a function type or an Optional function type. This
/// might be called on a directly applied value or on a call argument, which may
/// in turn be applied within the callee.
void swift::findClosuresForFunctionValue(
SILValue funcVal, TinyPtrVector<PartialApplyInst *> &results) {
SILType funcTy = funcVal->getType();
// Handle `Optional<@convention(block) @noescape (_)->(_)>`
if (auto optionalObjTy = funcTy.getOptionalObjectType())
funcTy = optionalObjTy;
assert(funcTy.is<SILFunctionType>());
SmallVector<SILValue, 4> worklist;
// Avoid exponential path exploration and prevent duplicate results.
llvm::SmallDenseSet<SILValue, 8> visited;
auto worklistInsert = [&](SILValue V) {
if (visited.insert(V).second)
worklist.push_back(V);
};
worklistInsert(funcVal);
while (!worklist.empty()) {
SILValue V = worklist.pop_back_val();
if (auto *I = V->getDefiningInstruction()) {
// Look through copies, borrows, and conversions.
//
// Handle copy_block and copy_block_without_actually_escaping before
// calling findClosureStoredIntoBlock.
if (SingleValueInstruction *SVI = getSingleValueCopyOrCast(I)) {
worklistInsert(SVI->getOperand(0));
continue;
}
// Look through `differentiable_function` operands, which are all
// function-typed.
if (auto *DFI = dyn_cast<DifferentiableFunctionInst>(I)) {
for (auto &fn : DFI->getAllOperands())
worklistInsert(fn.get());
continue;
}
}
// Look through Optionals.
if (V->getType().getOptionalObjectType()) {
auto *EI = dyn_cast<EnumInst>(V);
if (EI && EI->hasOperand()) {
worklistInsert(EI->getOperand());
}
// Ignore the .None case.
continue;
}
// Look through Phis.
//
// This should be done before calling findClosureStoredIntoBlock.
if (auto *arg = dyn_cast<SILPhiArgument>(V)) {
SmallVector<std::pair<SILBasicBlock *, SILValue>, 2> blockArgs;
arg->getIncomingPhiValues(blockArgs);
for (auto &blockAndArg : blockArgs)
worklistInsert(blockAndArg.second);
continue;
}
// Look through ObjC closures.
auto fnType = V->getType().getAs<SILFunctionType>();
if (fnType
&& fnType->getRepresentation() == SILFunctionTypeRepresentation::Block) {
if (SILValue storedClosure = findClosureStoredIntoBlock(V))
worklistInsert(storedClosure);
continue;
}
if (auto *PAI = dyn_cast<PartialApplyInst>(V)) {
SILValue thunkArg = isPartialApplyOfReabstractionThunk(PAI);
if (thunkArg) {