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SILOwnershipVerifier.cpp
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//===--- SILOwnershipVerifier.cpp -----------------------------------------===//
//
// 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-ownership-verifier"
#include "swift/AST/ASTContext.h"
#include "swift/AST/AnyFunctionRef.h"
#include "swift/AST/Decl.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/Module.h"
#include "swift/AST/Types.h"
#include "swift/Basic/Range.h"
#include "swift/Basic/STLExtras.h"
#include "swift/Basic/TransformArrayRef.h"
#include "swift/ClangImporter/ClangModule.h"
#include "swift/SIL/Dominance.h"
#include "swift/SIL/DynamicCasts.h"
#include "swift/SIL/OwnershipChecker.h"
#include "swift/SIL/PrettyStackTrace.h"
#include "swift/SIL/Projection.h"
#include "swift/SIL/SILBuiltinVisitor.h"
#include "swift/SIL/SILDebugScope.h"
#include "swift/SIL/SILFunction.h"
#include "swift/SIL/SILModule.h"
#include "swift/SIL/SILOpenedArchetypesTracker.h"
#include "swift/SIL/SILVTable.h"
#include "swift/SIL/SILVisitor.h"
#include "swift/SIL/TransitivelyUnreachableBlocks.h"
#include "swift/SIL/TypeLowering.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include <algorithm>
using namespace swift;
// This is an option to put the SILOwnershipVerifier in testing mode. This
// causes the following:
//
// 1. Instead of printing an error message and aborting, the verifier will print
// the message and continue. This allows for FileCheck testing of the verifier.
//
// 2. SILInstruction::verifyOperandOwnership() is disabled. This is used for
// verification in SILBuilder. This causes errors to be printed twice, once when
// we build the IR and a second time when we perform a full verification of the
// IR. For testing purposes, we just want the later.
llvm::cl::opt<bool> IsSILOwnershipVerifierTestingEnabled(
"sil-ownership-verifier-enable-testing",
llvm::cl::desc("Put the sil ownership verifier in testing mode. See "
"comment in SILOwnershipVerifier.cpp above option for more "
"information."));
//===----------------------------------------------------------------------===//
// Generalized User
//===----------------------------------------------------------------------===//
namespace {
/// This is a class that models normal users and also cond_br users that are
/// associated with the block in the target block. This is safe to do since in
/// Semantic SIL, cond_br with non-trivial arguments are not allowed to have
/// critical edges.
class GeneralizedUser {
using InnerTy = llvm::PointerIntPair<SILInstruction *, 1>;
InnerTy User;
public:
GeneralizedUser(SILInstruction *I) : User(I) {
assert(!isa<CondBranchInst>(I));
}
GeneralizedUser(CondBranchInst *I) : User(I) {}
GeneralizedUser(CondBranchInst *I, unsigned SuccessorIndex)
: User(I, SuccessorIndex) {
assert(SuccessorIndex == CondBranchInst::TrueIdx ||
SuccessorIndex == CondBranchInst::FalseIdx);
}
GeneralizedUser(const GeneralizedUser &Other) : User(Other.User) {}
GeneralizedUser &operator=(const GeneralizedUser &Other) {
User = Other.User;
return *this;
}
operator SILInstruction *() { return User.getPointer(); }
operator const SILInstruction *() const { return User.getPointer(); }
SILInstruction *getInst() const { return User.getPointer(); }
SILBasicBlock *getParent() const;
bool isCondBranchUser() const {
return isa<CondBranchInst>(User.getPointer());
}
unsigned getCondBranchSuccessorID() const {
assert(isCondBranchUser());
return User.getInt();
}
SILBasicBlock::iterator getIterator() const {
return User.getPointer()->getIterator();
}
void *getAsOpaqueValue() const {
return llvm::PointerLikeTypeTraits<InnerTy>::getAsVoidPointer(User);
}
static GeneralizedUser getFromOpaqueValue(void *p) {
InnerTy TmpUser =
llvm::PointerLikeTypeTraits<InnerTy>::getFromVoidPointer(p);
if (auto *CBI = dyn_cast<CondBranchInst>(TmpUser.getPointer())) {
return GeneralizedUser(CBI, TmpUser.getInt());
}
return GeneralizedUser(TmpUser.getPointer());
}
enum {
NumLowBitsAvailable =
llvm::PointerLikeTypeTraits<InnerTy>::NumLowBitsAvailable
};
};
} // end anonymous namespace
SILBasicBlock *GeneralizedUser::getParent() const {
if (!isCondBranchUser()) {
return getInst()->getParent();
}
auto *CBI = cast<CondBranchInst>(getInst());
unsigned Number = getCondBranchSuccessorID();
if (Number == CondBranchInst::TrueIdx)
return CBI->getTrueBB();
return CBI->getFalseBB();
}
namespace llvm {
template <> class PointerLikeTypeTraits<GeneralizedUser> {
public:
static void *getAsVoidPointer(GeneralizedUser v) {
return v.getAsOpaqueValue();
}
static GeneralizedUser getFromVoidPointer(void *p) {
return GeneralizedUser::getFromOpaqueValue(p);
}
enum { NumLowBitsAvailable = GeneralizedUser::NumLowBitsAvailable };
};
} // namespace llvm
//===----------------------------------------------------------------------===//
// Utility
//===----------------------------------------------------------------------===//
static bool compatibleOwnershipKinds(ValueOwnershipKind K1,
ValueOwnershipKind K2) {
return K1.merge(K2).hasValue();
}
static bool isValueAddressOrTrivial(SILValue V, SILModule &M) {
return V->getType().isAddress() ||
V.getOwnershipKind() == ValueOwnershipKind::Trivial ||
V.getOwnershipKind() == ValueOwnershipKind::Any;
}
static bool isOwnershipForwardingValueKind(ValueKind K) {
switch (K) {
case ValueKind::TupleInst:
case ValueKind::StructInst:
case ValueKind::EnumInst:
case ValueKind::OpenExistentialRefInst:
case ValueKind::UpcastInst:
case ValueKind::UncheckedRefCastInst:
case ValueKind::ConvertFunctionInst:
case ValueKind::RefToBridgeObjectInst:
case ValueKind::BridgeObjectToRefInst:
case ValueKind::UnconditionalCheckedCastInst:
case ValueKind::UnconditionalCheckedCastValueInst:
case ValueKind::TupleExtractInst:
case ValueKind::StructExtractInst:
case ValueKind::UncheckedEnumDataInst:
case ValueKind::MarkUninitializedInst:
case ValueKind::SelectEnumInst:
return true;
default:
return false;
}
}
static bool isOwnershipForwardingValue(SILValue V) {
return isOwnershipForwardingValueKind(V->getKind());
}
static bool isOwnershipForwardingInst(SILInstruction *I) {
return isOwnershipForwardingValueKind(I->getKind());
}
//===----------------------------------------------------------------------===//
// OwnershipCompatibilityUseChecker
//===----------------------------------------------------------------------===//
namespace {
struct ErrorBehaviorKind {
enum inner_t {
Invalid = 0,
ReturnFalse = 1,
PrintMessage = 2,
Assert = 4,
PrintMessageAndReturnFalse = PrintMessage | ReturnFalse,
PrintMessageAndAssert = PrintMessage | Assert,
} Value;
ErrorBehaviorKind() : Value(Invalid) {}
ErrorBehaviorKind(inner_t Inner) : Value(Inner) { assert(Value != Invalid); }
bool shouldAssert() const {
assert(Value != Invalid);
return Value & Assert;
}
bool shouldPrintMessage() const {
assert(Value != Invalid);
return Value & PrintMessage;
}
bool shouldReturnFalse() const {
assert(Value != Invalid);
return Value & ReturnFalse;
}
};
struct OwnershipUseCheckerResult {
bool HasCompatibleOwnership;
bool ShouldCheckForDataflowViolations;
};
class OwnershipCompatibilityUseChecker
: public SILInstructionVisitor<OwnershipCompatibilityUseChecker,
OwnershipUseCheckerResult> {
public:
private:
SILModule &Mod;
const Operand &Op;
SILValue BaseValue;
ErrorBehaviorKind ErrorBehavior;
public:
/// Create a new OwnershipCompatibilityUseChecker.
///
/// In most cases, one should only pass in \p Op and \p BaseValue will be set
/// to Op.get(). In cases where one is trying to verify subobjects, Op.get()
/// should be the subobject and Value should be the parent object. An example
/// of where one would want to do this is in the case of value projections
/// like struct_extract.
OwnershipCompatibilityUseChecker(SILModule &M, const Operand &Op,
SILValue BaseValue,
ErrorBehaviorKind ErrorBehavior)
: Mod(M), Op(Op), BaseValue(BaseValue), ErrorBehavior(ErrorBehavior) {
assert((BaseValue == Op.get() ||
BaseValue.getOwnershipKind() == ValueOwnershipKind::Guaranteed) &&
"Guaranteed values are the only values allowed to have subobject");
// We only support subobjects on objects.
assert((BaseValue->getType().isObject() || !isCheckingSubObject()) &&
"Checking a subobject, but do not have an object base value?!");
}
bool isCheckingSubObject() const { return Op.get() != BaseValue; }
SILValue getValue() const { return Op.get(); }
ValueOwnershipKind getOwnershipKind() const {
assert(getValue().getOwnershipKind() == Op.get().getOwnershipKind() &&
"Expected ownership kind of parent value and operand");
return getValue().getOwnershipKind();
}
unsigned getOperandIndex() const { return Op.getOperandNumber(); }
SILType getType() const { return Op.get()->getType(); }
bool compatibleWithOwnership(ValueOwnershipKind Kind) const {
return compatibleOwnershipKinds(getOwnershipKind(), Kind);
}
bool isAddressOrTrivialType() const {
if (getType().isAddress())
return true;
return getOwnershipKind() == ValueOwnershipKind::Trivial ||
getOwnershipKind() == ValueOwnershipKind::Any;
}
/// Depending on our initialization, either return false or call Func and
/// throw an error.
bool handleError(llvm::function_ref<void()> &&MessagePrinterFunc) const {
if (ErrorBehavior.shouldPrintMessage()) {
MessagePrinterFunc();
}
if (ErrorBehavior.shouldReturnFalse()) {
return false;
}
assert(ErrorBehavior.shouldAssert() && "At this point, we should assert");
llvm_unreachable("triggering standard assertion failure routine");
}
OwnershipUseCheckerResult visitForwardingInst(SILInstruction *I,
ArrayRef<Operand> Ops);
OwnershipUseCheckerResult visitForwardingInst(SILInstruction *I) {
return visitForwardingInst(I, I->getAllOperands());
}
OwnershipUseCheckerResult
visitApplyArgument(ValueOwnershipKind RequiredConvention, bool ShouldCheck);
OwnershipUseCheckerResult
visitNonTrivialEnum(EnumDecl *E, ValueOwnershipKind RequiredConvention);
/// Check if \p User as compatible ownership with the SILValue that we are
/// checking.
///
/// \returns true if the user is a use that must be checked for dataflow
/// violations.
bool check(SILInstruction *User) {
auto Result = visit(User);
if (!Result.HasCompatibleOwnership) {
return handleError([&]() {
llvm::errs() << "Function: '" << User->getFunction()->getName() << "'\n"
<< "Have operand with incompatible ownership?!\n"
<< "Value: " << *getValue() << "BaseValue: " << *BaseValue
<< "User: " << *User << "Conv: " << getOwnershipKind()
<< "\n\n";
});
}
assert((!Result.ShouldCheckForDataflowViolations ||
!isAddressOrTrivialType()) &&
"Address or trivial types should never be checked for dataflow "
"violations");
return Result.ShouldCheckForDataflowViolations;
}
OwnershipUseCheckerResult visitValueBase(ValueBase *) {
llvm_unreachable("Unimplemented?!");
}
OwnershipUseCheckerResult visitCallee(CanSILFunctionType SubstCalleeType);
OwnershipUseCheckerResult
checkTerminatorArgumentMatchesDestBB(SILBasicBlock *DestBB, unsigned OpIndex);
// Create declarations for all instructions, so we get a warning at compile
// time if any instructions do not have an implementation.
#define INST(Id, Parent, TextualName, MemBehavior, MayRelease) \
OwnershipUseCheckerResult visit##Id(Id *);
#include "swift/SIL/SILNodes.def"
};
} // end anonymous namespace
/// Implementation for instructions without operands. These should never be
/// visited.
#define NO_OPERAND_INST(INST) \
OwnershipUseCheckerResult \
OwnershipCompatibilityUseChecker::visit##INST##Inst(INST##Inst *I) { \
assert(I->getNumOperands() == 0 && \
"Expected instruction without operands?!"); \
llvm_unreachable("Instruction without operand can not be compatible with " \
"any def's OwnershipValueKind"); \
}
NO_OPERAND_INST(AllocBox)
NO_OPERAND_INST(AllocExistentialBox)
NO_OPERAND_INST(AllocGlobal)
NO_OPERAND_INST(AllocStack)
NO_OPERAND_INST(FloatLiteral)
NO_OPERAND_INST(FunctionRef)
NO_OPERAND_INST(GlobalAddr)
NO_OPERAND_INST(IntegerLiteral)
NO_OPERAND_INST(Metatype)
NO_OPERAND_INST(ObjCProtocol)
NO_OPERAND_INST(RetainValue)
NO_OPERAND_INST(StringLiteral)
NO_OPERAND_INST(ConstStringLiteral)
NO_OPERAND_INST(StrongRetain)
NO_OPERAND_INST(StrongRetainUnowned)
NO_OPERAND_INST(UnownedRetain)
NO_OPERAND_INST(Unreachable)
#undef NO_OPERAND_INST
/// Instructions whose arguments are always compatible with one convention.
#define CONSTANT_OWNERSHIP_INST(OWNERSHIP, \
SHOULD_CHECK_FOR_DATAFLOW_VIOLATIONS, INST) \
OwnershipUseCheckerResult \
OwnershipCompatibilityUseChecker::visit##INST##Inst(INST##Inst *I) { \
assert(I->getNumOperands() && "Expected to have non-zero operands"); \
if (ValueOwnershipKind::OWNERSHIP == ValueOwnershipKind::Trivial) { \
assert(isAddressOrTrivialType() && \
"Trivial ownership requires a trivial type or an address"); \
} \
\
return {compatibleWithOwnership(ValueOwnershipKind::OWNERSHIP), \
SHOULD_CHECK_FOR_DATAFLOW_VIOLATIONS}; \
}
CONSTANT_OWNERSHIP_INST(Guaranteed, true, EndBorrowArgument)
CONSTANT_OWNERSHIP_INST(Guaranteed, false, RefElementAddr)
CONSTANT_OWNERSHIP_INST(Owned, true, AutoreleaseValue)
CONSTANT_OWNERSHIP_INST(Owned, true, DeallocBox)
CONSTANT_OWNERSHIP_INST(Owned, true, DeallocExistentialBox)
CONSTANT_OWNERSHIP_INST(Owned, true, DeallocPartialRef)
CONSTANT_OWNERSHIP_INST(Owned, true, DeallocRef)
CONSTANT_OWNERSHIP_INST(Owned, true, DestroyValue)
CONSTANT_OWNERSHIP_INST(Owned, true, ReleaseValue)
CONSTANT_OWNERSHIP_INST(Owned, true, StrongRelease)
CONSTANT_OWNERSHIP_INST(Owned, true, StrongUnpin)
CONSTANT_OWNERSHIP_INST(Owned, true, UnownedRelease)
CONSTANT_OWNERSHIP_INST(Owned, true, InitExistentialRef)
CONSTANT_OWNERSHIP_INST(Owned, true, OpenExistentialOpaque)
CONSTANT_OWNERSHIP_INST(Owned, true, EndLifetime)
CONSTANT_OWNERSHIP_INST(Trivial, false, AddressToPointer)
CONSTANT_OWNERSHIP_INST(Trivial, false, BeginAccess)
CONSTANT_OWNERSHIP_INST(Trivial, false, BindMemory)
CONSTANT_OWNERSHIP_INST(Trivial, false, CheckedCastAddrBranch)
CONSTANT_OWNERSHIP_INST(Trivial, false, CondFail)
CONSTANT_OWNERSHIP_INST(Trivial, false, CopyAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, DeallocStack)
CONSTANT_OWNERSHIP_INST(Trivial, false, DebugValueAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, DeinitExistentialAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, DestroyAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, EndAccess)
CONSTANT_OWNERSHIP_INST(Trivial, false, IndexAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, IndexRawPointer)
CONSTANT_OWNERSHIP_INST(Trivial, false, InitBlockStorageHeader)
CONSTANT_OWNERSHIP_INST(Trivial, false, InitEnumDataAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, InitExistentialAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, InitExistentialMetatype)
CONSTANT_OWNERSHIP_INST(Trivial, false, InjectEnumAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, IsNonnull)
CONSTANT_OWNERSHIP_INST(Trivial, false, IsUnique)
CONSTANT_OWNERSHIP_INST(Trivial, false, IsUniqueOrPinned)
CONSTANT_OWNERSHIP_INST(Trivial, false, Load)
CONSTANT_OWNERSHIP_INST(Trivial, false, LoadBorrow)
CONSTANT_OWNERSHIP_INST(Trivial, false, LoadUnowned)
CONSTANT_OWNERSHIP_INST(Trivial, false, LoadWeak)
CONSTANT_OWNERSHIP_INST(Trivial, false, MarkFunctionEscape)
CONSTANT_OWNERSHIP_INST(Trivial, false, MarkUninitializedBehavior)
CONSTANT_OWNERSHIP_INST(Trivial, false, ObjCExistentialMetatypeToObject)
CONSTANT_OWNERSHIP_INST(Trivial, false, ObjCMetatypeToObject)
CONSTANT_OWNERSHIP_INST(Trivial, false, ObjCToThickMetatype)
CONSTANT_OWNERSHIP_INST(Trivial, false, OpenExistentialAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, OpenExistentialMetatype)
CONSTANT_OWNERSHIP_INST(Trivial, false, PointerToAddress)
CONSTANT_OWNERSHIP_INST(Trivial, false, PointerToThinFunction)
CONSTANT_OWNERSHIP_INST(Trivial, false, ProjectBlockStorage)
CONSTANT_OWNERSHIP_INST(Trivial, false, ProjectValueBuffer)
CONSTANT_OWNERSHIP_INST(Trivial, false, RawPointerToRef)
CONSTANT_OWNERSHIP_INST(Trivial, false, SelectEnumAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, SelectValue)
CONSTANT_OWNERSHIP_INST(Trivial, false, StructElementAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, SwitchEnumAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, SwitchValue)
CONSTANT_OWNERSHIP_INST(Trivial, false, TailAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, ThickToObjCMetatype)
CONSTANT_OWNERSHIP_INST(Trivial, false, ThinFunctionToPointer)
CONSTANT_OWNERSHIP_INST(Trivial, false, ThinToThickFunction)
CONSTANT_OWNERSHIP_INST(Trivial, false, TupleElementAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, UncheckedAddrCast)
CONSTANT_OWNERSHIP_INST(Trivial, false, UncheckedRefCastAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, UncheckedTakeEnumDataAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, UnconditionalCheckedCastAddr)
CONSTANT_OWNERSHIP_INST(Trivial, false, UnmanagedToRef)
CONSTANT_OWNERSHIP_INST(Trivial, false, AllocValueBuffer)
CONSTANT_OWNERSHIP_INST(Trivial, false, DeallocValueBuffer)
#undef CONSTANT_OWNERSHIP_INST
/// Instructions whose arguments are always compatible with one convention.
#define CONSTANT_OR_TRIVIAL_OWNERSHIP_INST(OWNERSHIP, \
SHOULD_CHECK_FOR_DATAFLOW_VIOLATIONS, INST) \
OwnershipUseCheckerResult \
OwnershipCompatibilityUseChecker::visit##INST##Inst(INST##Inst *I) { \
assert(I->getNumOperands() && "Expected to have non-zero operands"); \
if (ValueOwnershipKind::OWNERSHIP == ValueOwnershipKind::Trivial) { \
assert(isAddressOrTrivialType() && \
"Trivial ownership requires a trivial type or an address"); \
} \
\
if (compatibleWithOwnership(ValueOwnershipKind::Trivial)) { \
return {true, false}; \
} \
return {compatibleWithOwnership(ValueOwnershipKind::OWNERSHIP), \
SHOULD_CHECK_FOR_DATAFLOW_VIOLATIONS}; \
}
CONSTANT_OR_TRIVIAL_OWNERSHIP_INST(Owned, true, CheckedCastBranch)
CONSTANT_OR_TRIVIAL_OWNERSHIP_INST(Owned, true, CheckedCastValueBranch)
CONSTANT_OR_TRIVIAL_OWNERSHIP_INST(Owned, true, SwitchEnum)
CONSTANT_OR_TRIVIAL_OWNERSHIP_INST(Owned, true, InitExistentialOpaque)
CONSTANT_OR_TRIVIAL_OWNERSHIP_INST(Owned, true, DeinitExistentialOpaque)
#undef CONSTANT_OR_TRIVIAL_OWNERSHIP_INST
#define ACCEPTS_ANY_OWNERSHIP_INST(INST) \
OwnershipUseCheckerResult \
OwnershipCompatibilityUseChecker::visit##INST##Inst(INST##Inst *I) { \
return {true, false}; \
}
ACCEPTS_ANY_OWNERSHIP_INST(BeginBorrow)
ACCEPTS_ANY_OWNERSHIP_INST(CopyValue)
ACCEPTS_ANY_OWNERSHIP_INST(DebugValue)
ACCEPTS_ANY_OWNERSHIP_INST(FixLifetime)
ACCEPTS_ANY_OWNERSHIP_INST(UncheckedBitwiseCast) // Is this right?
ACCEPTS_ANY_OWNERSHIP_INST(WitnessMethod) // Is this right?
ACCEPTS_ANY_OWNERSHIP_INST(ProjectBox) // The result is a T*.
ACCEPTS_ANY_OWNERSHIP_INST(DynamicMethodBranch)
ACCEPTS_ANY_OWNERSHIP_INST(UncheckedTrivialBitCast)
ACCEPTS_ANY_OWNERSHIP_INST(ExistentialMetatype)
ACCEPTS_ANY_OWNERSHIP_INST(ValueMetatype)
ACCEPTS_ANY_OWNERSHIP_INST(UncheckedOwnershipConversion)
#undef ACCEPTS_ANY_OWNERSHIP_INST
// Trivial if trivial typed, otherwise must accept owned?
#define ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(SHOULD_CHECK_FOR_DATAFLOW_VIOLATIONS, \
INST) \
OwnershipUseCheckerResult \
OwnershipCompatibilityUseChecker::visit##INST##Inst(INST##Inst *I) { \
assert(I->getNumOperands() && "Expected to have non-zero operands"); \
assert(!isAddressOrTrivialType() && \
"Shouldn't have an address or a non trivial type"); \
bool compatible = getOwnershipKind() == ValueOwnershipKind::Any || \
!compatibleWithOwnership(ValueOwnershipKind::Trivial); \
return {compatible, SHOULD_CHECK_FOR_DATAFLOW_VIOLATIONS}; \
}
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, SuperMethod)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, BridgeObjectToWord)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, ClassMethod)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, CopyBlock)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, DynamicMethod)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, OpenExistentialBox)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, RefTailAddr)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, RefToRawPointer)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, RefToUnmanaged)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, RefToUnowned)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, SetDeallocating)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, StrongPin)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, UnownedToRef)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, CopyUnownedValue)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, ProjectExistentialBox)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, UnmanagedRetainValue)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, UnmanagedReleaseValue)
ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP(false, UnmanagedAutoreleaseValue)
#undef ACCEPTS_ANY_NONTRIVIAL_OWNERSHIP
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitForwardingInst(SILInstruction *I, ArrayRef<Operand> Ops) {
assert(I->getNumOperands() && "Expected to have non-zero operands");
assert(isOwnershipForwardingInst(I) &&
"Expected to have an ownership forwarding inst");
// Find the first index where we have a trivial value.
auto Iter = find_if(Ops, [&I](const Operand &Op) -> bool {
if (I->isTypeDependentOperand(Op))
return false;
return Op.get().getOwnershipKind() != ValueOwnershipKind::Trivial;
});
// All trivial.
if (Iter == Ops.end()) {
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
}
unsigned Index = std::distance(Ops.begin(), Iter);
ValueOwnershipKind Base = Ops[Index].get().getOwnershipKind();
for (const Operand &Op : Ops.slice(Index + 1)) {
if (I->isTypeDependentOperand(Op))
continue;
auto OpKind = Op.get().getOwnershipKind();
if (OpKind.merge(ValueOwnershipKind::Trivial))
continue;
auto MergedValue = Base.merge(OpKind.Value);
if (!MergedValue.hasValue()) {
return {false, true};
}
Base = MergedValue.getValue();
}
// We only need to treat a forwarded instruction as a lifetime ending use of
// it is owned.
return {true, compatibleWithOwnership(ValueOwnershipKind::Owned)};
}
#define FORWARD_ANY_OWNERSHIP_INST(INST) \
OwnershipUseCheckerResult \
OwnershipCompatibilityUseChecker::visit##INST##Inst(INST##Inst *I) { \
return visitForwardingInst(I); \
}
FORWARD_ANY_OWNERSHIP_INST(Tuple)
FORWARD_ANY_OWNERSHIP_INST(Struct)
FORWARD_ANY_OWNERSHIP_INST(Enum)
FORWARD_ANY_OWNERSHIP_INST(OpenExistentialRef)
FORWARD_ANY_OWNERSHIP_INST(Upcast)
FORWARD_ANY_OWNERSHIP_INST(UncheckedRefCast)
FORWARD_ANY_OWNERSHIP_INST(ConvertFunction)
FORWARD_ANY_OWNERSHIP_INST(RefToBridgeObject)
FORWARD_ANY_OWNERSHIP_INST(BridgeObjectToRef)
FORWARD_ANY_OWNERSHIP_INST(UnconditionalCheckedCast)
FORWARD_ANY_OWNERSHIP_INST(UnconditionalCheckedCastValue)
FORWARD_ANY_OWNERSHIP_INST(MarkUninitialized)
FORWARD_ANY_OWNERSHIP_INST(UncheckedEnumData)
#undef FORWARD_ANY_OWNERSHIP_INST
// An instruction that forwards a constant ownership or trivial ownership.
#define FORWARD_CONSTANT_OR_TRIVIAL_OWNERSHIP_INST( \
OWNERSHIP, SHOULD_CHECK_FOR_DATAFLOW_VIOLATIONS, INST) \
OwnershipUseCheckerResult \
OwnershipCompatibilityUseChecker::visit##INST##Inst(INST##Inst *I) { \
assert(I->getNumOperands() && "Expected to have non-zero operands"); \
assert(isOwnershipForwardingInst(I) && \
"Expected an ownership forwarding inst"); \
if (ValueOwnershipKind::OWNERSHIP != ValueOwnershipKind::Trivial && \
getOwnershipKind() == ValueOwnershipKind::Trivial) { \
assert(isAddressOrTrivialType() && \
"Trivial ownership requires a trivial type or an address"); \
return {true, false}; \
} \
if (ValueOwnershipKind::OWNERSHIP == ValueOwnershipKind::Trivial) { \
assert(isAddressOrTrivialType() && \
"Trivial ownership requires a trivial type or an address"); \
} \
\
return {compatibleWithOwnership(ValueOwnershipKind::OWNERSHIP), \
SHOULD_CHECK_FOR_DATAFLOW_VIOLATIONS}; \
}
FORWARD_CONSTANT_OR_TRIVIAL_OWNERSHIP_INST(Guaranteed, false, TupleExtract)
FORWARD_CONSTANT_OR_TRIVIAL_OWNERSHIP_INST(Guaranteed, false, StructExtract)
#undef CONSTANT_OR_TRIVIAL_OWNERSHIP_INST
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitSelectEnumInst(SelectEnumInst *I) {
if (getValue() == I->getEnumOperand()) {
return {true, false};
}
return visitForwardingInst(I, I->getAllOperands().drop_front());
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitAllocRefInst(AllocRefInst *I) {
assert(I->getNumOperands() != 0
&& "If we reach this point, we must have a tail operand");
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitAllocRefDynamicInst(
AllocRefDynamicInst *I) {
assert(I->getNumOperands() != 0 &&
"If we reach this point, we must have a tail operand");
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::checkTerminatorArgumentMatchesDestBB(
SILBasicBlock *DestBB, unsigned OpIndex) {
// Grab the ownership kind of the destination block.
ValueOwnershipKind DestBlockArgOwnershipKind =
DestBB->getArgument(OpIndex)->getOwnershipKind();
// Then if we do not have an enum, make sure that the conventions match.
EnumDecl *E = getType().getEnumOrBoundGenericEnum();
if (!E) {
return {compatibleWithOwnership(DestBlockArgOwnershipKind),
getOwnershipKind() == ValueOwnershipKind::Owned};
}
return visitNonTrivialEnum(E, DestBlockArgOwnershipKind);
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitBranchInst(BranchInst *BI) {
return checkTerminatorArgumentMatchesDestBB(BI->getDestBB(),
getOperandIndex());
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitCondBranchInst(CondBranchInst *CBI) {
// If our conditional branch is the condition, it is trivial. Check that the
// ownership kind is trivial.
if (CBI->isConditionOperandIndex(getOperandIndex()))
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
// Otherwise, make sure that our operand matches the
if (CBI->isTrueOperandIndex(getOperandIndex())) {
unsigned TrueOffset = 1;
return checkTerminatorArgumentMatchesDestBB(CBI->getTrueBB(),
getOperandIndex() - TrueOffset);
}
assert(CBI->isFalseOperandIndex(getOperandIndex()) &&
"If an operand is not the condition index or a true operand index, it "
"must be a false operand index");
unsigned FalseOffset = 1 + CBI->getTrueOperands().size();
return checkTerminatorArgumentMatchesDestBB(CBI->getFalseBB(),
getOperandIndex() - FalseOffset);
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitReturnInst(ReturnInst *RI) {
SILModule &M = RI->getModule();
bool IsTrivial = RI->getOperand()->getType().isTrivial(M);
SILFunctionConventions fnConv = RI->getFunction()->getConventions();
auto Results = fnConv.getDirectSILResults();
if (Results.empty() || IsTrivial) {
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
}
CanGenericSignature Sig = fnConv.funcTy->getGenericSignature();
// Find the first index where we have a trivial value.
auto Iter = find_if(Results, [&M, &Sig](const SILResultInfo &Info) -> bool {
return Info.getOwnershipKind(M, Sig) != ValueOwnershipKind::Trivial;
});
// If we have all trivial, then we must be trivial. Why wasn't our original
// type trivial? This is a hard error since this is a logic error in our code
// here.
if (Iter == Results.end())
llvm_unreachable("Should have already checked a trivial type?!");
ValueOwnershipKind Base = Iter->getOwnershipKind(M, Sig);
for (const SILResultInfo &ResultInfo :
SILFunctionConventions::DirectSILResultRange(std::next(Iter),
Results.end())) {
auto RKind = ResultInfo.getOwnershipKind(M, Sig);
// Ignore trivial types.
if (RKind.merge(ValueOwnershipKind::Trivial))
continue;
auto MergedValue = Base.merge(RKind);
// If we fail to merge all types in, bail. We can not come up with a proper
// result type.
if (!MergedValue.hasValue()) {
return {false, false};
}
// In case Base is Any.
Base = MergedValue.getValue();
}
return {compatibleWithOwnership(Base), true};
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitEndBorrowInst(EndBorrowInst *I) {
// We do not consider the original value to be a verified use. But the value
// does need to be alive.
if (getOperandIndex() == EndBorrowInst::OriginalValue)
return {true, false};
// The borrowed value is a verified use though of the begin_borrow.
return {compatibleWithOwnership(ValueOwnershipKind::Guaranteed), true};
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitThrowInst(ThrowInst *I) {
return {compatibleWithOwnership(ValueOwnershipKind::Owned), true};
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitStoreUnownedInst(StoreUnownedInst *I) {
if (getValue() == I->getSrc())
return {compatibleWithOwnership(ValueOwnershipKind::Owned), true};
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitStoreWeakInst(StoreWeakInst *I) {
if (getValue() == I->getSrc())
return {compatibleWithOwnership(ValueOwnershipKind::Owned), true};
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitStoreBorrowInst(StoreBorrowInst *I) {
if (getValue() == I->getSrc())
return {compatibleWithOwnership(ValueOwnershipKind::Guaranteed), false};
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
}
// FIXME: Why not use SILArgumentConvention here?
OwnershipUseCheckerResult OwnershipCompatibilityUseChecker::visitCallee(
CanSILFunctionType SubstCalleeType) {
ParameterConvention Conv = SubstCalleeType->getCalleeConvention();
switch (Conv) {
case ParameterConvention::Indirect_In:
assert(!SILModuleConventions(Mod).isSILIndirect(
SILParameterInfo(SubstCalleeType, Conv)));
return {compatibleWithOwnership(ValueOwnershipKind::Owned), true};
case ParameterConvention::Indirect_In_Guaranteed:
assert(!SILModuleConventions(Mod).isSILIndirect(
SILParameterInfo(SubstCalleeType, Conv)));
return {compatibleWithOwnership(ValueOwnershipKind::Owned), false};
case ParameterConvention::Indirect_Inout:
case ParameterConvention::Indirect_InoutAliasable:
llvm_unreachable("Illegal convention for callee");
case ParameterConvention::Direct_Unowned:
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
case ParameterConvention::Direct_Owned:
return {compatibleWithOwnership(ValueOwnershipKind::Owned), true};
case ParameterConvention::Direct_Guaranteed:
return {compatibleWithOwnership(ValueOwnershipKind::Guaranteed), false};
}
llvm_unreachable("Unhandled ParameterConvention in switch.");
}
OwnershipUseCheckerResult OwnershipCompatibilityUseChecker::visitNonTrivialEnum(
EnumDecl *E, ValueOwnershipKind RequiredKind) {
// Otherwise, first see if the enum is completely trivial. In such a case, we
// need an argument with a trivial convention. If we have an enum with at
// least 1 non-trivial case, then we need an argument with a non-trivial
// convention. If our parameter is trivial, then we just let it through in
// such a case. Otherwise we need to make sure that the non-trivial ownership
// convention matches the one on the argument parameter.
// Check if this enum has at least one case that is non-trivially typed.
bool HasNonTrivialCase =
llvm::any_of(E->getAllElements(), [this](EnumElementDecl *E) -> bool {
if (!E->getArgumentInterfaceType())
return false;
SILType EnumEltType = getType().getEnumElementType(E, Mod);
return !EnumEltType.isTrivial(Mod);
});
// If we have all trivial cases, make sure we are compatible with a trivial
// ownership kind.
if (!HasNonTrivialCase) {
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
}
// Otherwise, if this value is a trivial ownership kind, return.
if (compatibleWithOwnership(ValueOwnershipKind::Trivial)) {
return {true, false};
}
// And finally finish by making sure that if we have a non-trivial ownership
// kind that it matches the argument's convention.
return {compatibleWithOwnership(RequiredKind),
compatibleWithOwnership(ValueOwnershipKind::Owned)};
}
// We allow for trivial cases of enums with non-trivial cases to be passed in
// non-trivial argument positions. This fits with modeling of a
// SILFunctionArgument as a phi in a global program graph.
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitApplyArgument(ValueOwnershipKind Kind,
bool ShouldCheck) {
// Check if we have an enum. If not, then we just check against the passed in
// convention.
EnumDecl *E = getType().getEnumOrBoundGenericEnum();
if (!E) {
return {compatibleWithOwnership(Kind), ShouldCheck};
}
return visitNonTrivialEnum(E, Kind);
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitApplyInst(ApplyInst *I) {
// If we are visiting the callee, handle it specially.
if (getOperandIndex() == 0)
return visitCallee(I->getSubstCalleeType());
switch (I->getArgumentConvention(getOperandIndex() - 1)) {
case SILArgumentConvention::Indirect_In:
case SILArgumentConvention::Indirect_In_Guaranteed:
case SILArgumentConvention::Indirect_Inout:
case SILArgumentConvention::Indirect_InoutAliasable:
case SILArgumentConvention::Indirect_Out:
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
case SILArgumentConvention::Direct_Owned:
return visitApplyArgument(ValueOwnershipKind::Owned, true);
case SILArgumentConvention::Direct_Unowned:
if (isAddressOrTrivialType())
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
// We accept unowned, owned, and guaranteed in unowned positions.
return {true, false};
case SILArgumentConvention::Direct_Guaranteed:
return visitApplyArgument(ValueOwnershipKind::Guaranteed, false);
case SILArgumentConvention::Direct_Deallocating:
llvm_unreachable("No ownership associated with deallocating");
}
llvm_unreachable("Unhandled SILArgumentConvention in switch.");
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitTryApplyInst(TryApplyInst *I) {
// If we are visiting the callee, handle it specially.
if (getOperandIndex() == 0)
return visitCallee(I->getSubstCalleeType());
switch (I->getArgumentConvention(getOperandIndex() - 1)) {
case SILArgumentConvention::Indirect_In:
case SILArgumentConvention::Indirect_In_Guaranteed:
case SILArgumentConvention::Indirect_Inout:
case SILArgumentConvention::Indirect_InoutAliasable:
case SILArgumentConvention::Indirect_Out:
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
case SILArgumentConvention::Direct_Owned:
return visitApplyArgument(ValueOwnershipKind::Owned, true);
case SILArgumentConvention::Direct_Unowned:
if (isAddressOrTrivialType())
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
// We accept unowned, owned, and guaranteed in unowned positions.
return {true, false};
case SILArgumentConvention::Direct_Guaranteed:
return visitApplyArgument(ValueOwnershipKind::Guaranteed, false);
case SILArgumentConvention::Direct_Deallocating:
llvm_unreachable("No ownership associated with deallocating");
}
llvm_unreachable("Unhandled SILArgumentConvention in switch.");
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitPartialApplyInst(PartialApplyInst *I) {
// All non-trivial types should be captured.
if (isAddressOrTrivialType()) {
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
}
return {compatibleWithOwnership(ValueOwnershipKind::Owned), true};
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitAssignInst(AssignInst *I) {
if (getValue() == I->getSrc()) {
if (isAddressOrTrivialType()) {
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
}
return {compatibleWithOwnership(ValueOwnershipKind::Owned), true};
}
return {true, false};
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitStoreInst(StoreInst *I) {
if (getValue() == I->getSrc()) {
if (isAddressOrTrivialType()) {
return {compatibleWithOwnership(ValueOwnershipKind::Trivial), false};
}
return {compatibleWithOwnership(ValueOwnershipKind::Owned), true};
}
return {true, false};
}
OwnershipUseCheckerResult
OwnershipCompatibilityUseChecker::visitMarkDependenceInst(
MarkDependenceInst *MDI) {
// We always treat mark dependence as a use that keeps a value alive. We will
// be introducing a begin_dependence/end_dependence version of this later.
return {true, false};
}
//===----------------------------------------------------------------------===//
// Builtin Use Checker
//===----------------------------------------------------------------------===//
namespace {
class OwnershipCompatibilityBuiltinUseChecker
: public SILBuiltinVisitor<OwnershipCompatibilityBuiltinUseChecker,
OwnershipUseCheckerResult> {
const OwnershipCompatibilityUseChecker &ParentChecker;
public:
OwnershipCompatibilityBuiltinUseChecker(
OwnershipCompatibilityUseChecker &ParentChecker)
: ParentChecker(ParentChecker) {}
SILValue getValue() const { return ParentChecker.getValue(); }
ValueOwnershipKind getOwnershipKind() const {
return ParentChecker.getOwnershipKind();
}