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Verifier.cpp
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//===--- Verifier.cpp - Verification of Swift SIL Code --------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "silverifier"
#include "swift/SIL/SILDebugScope.h"
#include "swift/SIL/SILFunction.h"
#include "swift/SIL/SILModule.h"
#include "swift/SIL/SILVisitor.h"
#include "swift/SIL/SILVTable.h"
#include "swift/SIL/Dominance.h"
#include "swift/SIL/DynamicCasts.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/Decl.h"
#include "swift/AST/Module.h"
#include "swift/AST/Types.h"
#include "swift/SIL/PrettyStackTrace.h"
#include "swift/SIL/TypeLowering.h"
#include "swift/ClangImporter/ClangModule.h"
#include "swift/Basic/Range.h"
#include "llvm/Support/Debug.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/Support/CommandLine.h"
using namespace swift;
using Lowering::AbstractionPattern;
// This flag is used only to check that sil-combine can properly
// remove any code after unreachable, thus bringing SIL into
// its canonical form which may get temporarily broken during
// intermediate transformations.
static llvm::cl::opt<bool> SkipUnreachableMustBeLastErrors(
"verify-skip-unreachable-must-be-last",
llvm::cl::init(false));
// The verifier is basically all assertions, so don't compile it with NDEBUG to
// prevent release builds from triggering spurious unused variable warnings.
#ifndef NDEBUG
/// Returns true if A is an opened existential type, Self, or is equal to an
/// archetype in F's nested archetype list.
///
/// FIXME: Once Self has been removed in favor of opened existential types
/// everywhere, remove support for self.
static bool isArchetypeValidInFunction(ArchetypeType *A, SILFunction *F) {
// The only two cases where an archetype is always legal in a function is if
// it is self or if it is from an opened existential type. Currently, Self is
// being migrated away from in favor of opened existential types, so we should
// remove the special case here for Self when that process is completed.
//
// *NOTE* Associated types of self are not valid here.
if (!A->getOpenedExistentialType().isNull() || A->getSelfProtocol())
return true;
// Ok, we have an archetype, make sure it is in the nested archetypes of our
// caller.
for (auto Iter : F->getContextGenericParams()->getAllNestedArchetypes())
if (A->isEqual(&*Iter))
return true;
return A->getIsRecursive();
}
namespace {
/// Metaprogramming-friendly base class.
template <class Impl>
class SILVerifierBase : public SILVisitor<Impl> {
public:
// visitCLASS calls visitPARENT and checkCLASS.
// checkCLASS does nothing by default.
#define VALUE(CLASS, PARENT) \
void visit##CLASS(CLASS *I) { \
static_cast<Impl*>(this)->visit##PARENT(I); \
static_cast<Impl*>(this)->check##CLASS(I); \
} \
void check##CLASS(CLASS *I) {}
#include "swift/SIL/SILNodes.def"
void visitValueBase(ValueBase *V) {
static_cast<Impl*>(this)->checkValueBase(V);
}
void checkValueBase(ValueBase *V) {}
};
} // end anonymous namespace
namespace {
/// The SIL verifier walks over a SIL function / basic block / instruction,
/// checking and enforcing its invariants.
class SILVerifier : public SILVerifierBase<SILVerifier> {
Module *M;
const SILFunction &F;
Lowering::TypeConverter &TC;
const SILInstruction *CurInstruction = nullptr;
DominanceInfo *Dominance = nullptr;
SILVerifier(const SILVerifier&) = delete;
void operator=(const SILVerifier&) = delete;
public:
void _require(bool condition, const Twine &complaint,
const std::function<void()> &extraContext = nullptr) {
if (condition) return;
llvm::dbgs() << "SIL verification failed: " << complaint << "\n";
if (extraContext) extraContext();
if (CurInstruction) {
llvm::dbgs() << "Verifying instruction:\n";
CurInstruction->printInContext(llvm::dbgs());
llvm::dbgs() << "In function:\n";
F.print(llvm::dbgs());
} else {
llvm::dbgs() << "In function:\n";
F.print(llvm::dbgs());
}
abort();
}
#define require(condition, complaint) \
_require(bool(condition), complaint ": " #condition)
template <class T> typename CanTypeWrapperTraits<T>::type
_requireObjectType(SILType type, const Twine &valueDescription,
const char *typeName) {
_require(type.isObject(), valueDescription + " must be an object");
auto result = type.getAs<T>();
_require(bool(result), valueDescription + " must have type " + typeName);
return result;
}
template <class T> typename CanTypeWrapperTraits<T>::type
_requireObjectType(SILValue value, const Twine &valueDescription,
const char *typeName) {
return _requireObjectType<T>(value.getType(), valueDescription, typeName);
}
#define requireObjectType(type, value, valueDescription) \
_requireObjectType<type>(value, valueDescription, #type)
template <class T>
typename CanTypeWrapperTraits<T>::type
_forbidObjectType(SILType type, const Twine &valueDescription,
const char *typeName) {
_require(type.isObject(), valueDescription + " must be an object");
auto result = type.getAs<T>();
_require(!bool(result),
valueDescription + " must not have type " + typeName);
return result;
}
template <class T>
typename CanTypeWrapperTraits<T>::type
_forbidObjectType(SILValue value, const Twine &valueDescription,
const char *typeName) {
return _forbidObjectType<T>(value.getType(), valueDescription, typeName);
}
#define forbidObjectType(type, value, valueDescription) \
_forbidObjectType<type>(value, valueDescription, #type)
// Require that the operand is a non-optional, non-unowned reference-counted
// type.
void requireReferenceValue(SILValue value, const Twine &valueDescription) {
require(value.getType().isObject(), valueDescription +" must be an object");
require(value.getType().isReferenceCounted(F.getModule()),
valueDescription + " must have reference semantics");
forbidObjectType(UnownedStorageType, value, valueDescription);
}
// Require that the operand is a reference-counted type, or an Optional
// thereof.
void requireReferenceOrOptionalReferenceValue(SILValue value,
const Twine &valueDescription) {
require(value.getType().isObject(), valueDescription +" must be an object");
auto objectTy = value.getType();
OptionalTypeKind otk;
if (auto optObjTy = objectTy.getAnyOptionalObjectType(F.getModule(), otk)) {
objectTy = optObjTy;
}
require(objectTy.isReferenceCounted(F.getModule()),
valueDescription + " must have reference semantics");
}
// Require that the operand is a type that supports reference storage
// modifiers.
void requireReferenceStorageCapableValue(SILValue value,
const Twine &valueDescription) {
requireReferenceOrOptionalReferenceValue(value, valueDescription);
require(!value.getType().is<SILFunctionType>(),
valueDescription + " cannot apply to a function type");
}
// Require that the operand is a reference-counted type, or potentially an
// optional thereof.
void requireRetainablePointerValue(SILValue value,
const Twine &valueDescription) {
require(value.getType().isObject(), valueDescription +" must be an object");
require(value.getType().hasRetainablePointerRepresentation(),
valueDescription + " must have retainable pointer representation");
}
/// Assert that two types are equal.
void requireSameType(SILType type1, SILType type2, const Twine &complaint) {
_require(type1 == type2, complaint, [&] {
llvm::dbgs() << " " << type1 << "\n " << type2 << '\n';
});
}
/// Require two function types to be ABI-compatible.
void requireABICompatibleFunctionTypes(CanSILFunctionType type1,
CanSILFunctionType type2,
const Twine &what) {
auto complain = [=](const char *msg) -> std::function<void()> {
return [=]{
llvm::dbgs() << " " << msg << '\n'
<< " " << type1 << "\n " << type2 << '\n';
};
};
auto complainBy = [=](std::function<void()> msg) -> std::function<void()> {
return [=]{
msg();
llvm::dbgs() << '\n';
llvm::dbgs() << " " << type1 << "\n " << type2 << '\n';
};
};
// The calling convention and function representation can't be changed.
_require(type1->getRepresentation() == type2->getRepresentation(), what,
complain("Different function representations"));
// TODO: We should compare generic signatures. Class and witness methods
// allow variance in "self"-fulfilled parameters; other functions must
// match exactly.
auto signature1 = type1->getGenericSignature();
auto signature2 = type2->getGenericSignature();
auto getAnyOptionalObjectTypeInContext = [&](CanGenericSignature sig,
SILType type) {
Lowering::GenericContextScope context(F.getModule().Types, sig);
OptionalTypeKind _;
return type.getAnyOptionalObjectType(F.getModule(), _);
};
// TODO: More sophisticated param and return ABI compatibility rules could
// diverge.
std::function<bool (SILType, SILType)>
areABICompatibleParamsOrReturns = [&](SILType a, SILType b) -> bool {
// Address parameters are all ABI-compatible, though the referenced
// values may not be. Assume whoever's doing this knows what they're
// doing.
if (a.isAddress() && b.isAddress())
return true;
// Addresses aren't compatible with values.
// TODO: An exception for pointerish types?
else if (a.isAddress() || b.isAddress())
return false;
// Tuples are ABI compatible if their elements are.
// TODO: Should destructure recursively.
SmallVector<CanType, 1> aElements, bElements;
if (auto tup = a.getAs<TupleType>()) {
auto types = tup.getElementTypes();
aElements.append(types.begin(), types.end());
} else {
aElements.push_back(a.getSwiftRValueType());
}
if (auto tup = b.getAs<TupleType>()) {
auto types = tup.getElementTypes();
bElements.append(types.begin(), types.end());
} else {
bElements.push_back(b.getSwiftRValueType());
}
if (aElements.size() != bElements.size())
return false;
for (unsigned i : indices(aElements)) {
auto aa = SILType::getPrimitiveObjectType(aElements[i]),
bb = SILType::getPrimitiveObjectType(bElements[i]);
// Equivalent types are always ABI-compatible.
if (aa == bb)
continue;
// FIXME: If one or both types are dependent, we can't accurately assess
// whether they're ABI-compatible without a generic context. We can
// do a better job here when dependent types are related to their
// generic signatures.
if (aa.hasTypeParameter() || bb.hasTypeParameter())
continue;
// Bridgeable object types are interchangeable.
if (aa.isBridgeableObjectType() && bb.isBridgeableObjectType())
continue;
// Optional and IUO are interchangeable if their elements are.
auto aObject = getAnyOptionalObjectTypeInContext(signature1, aa);
auto bObject = getAnyOptionalObjectTypeInContext(signature2, bb);
if (aObject && bObject
&& areABICompatibleParamsOrReturns(aObject, bObject))
continue;
// Optional objects are ABI-interchangeable with non-optionals;
// None is represented by a null pointer.
if (aObject && aObject.isBridgeableObjectType()
&& bb.isBridgeableObjectType())
continue;
if (bObject && bObject.isBridgeableObjectType()
&& aa.isBridgeableObjectType())
continue;
// Optional thick metatypes are ABI-interchangeable with non-optionals
// too.
if (aObject)
if (auto aObjMeta = aObject.getAs<MetatypeType>())
if (auto bMeta = bb.getAs<MetatypeType>())
if (aObjMeta->getRepresentation() == bMeta->getRepresentation()
&& bMeta->getRepresentation() != MetatypeRepresentation::Thin)
continue;
if (bObject)
if (auto aMeta = aa.getAs<MetatypeType>())
if (auto bObjMeta = bObject.getAs<MetatypeType>())
if (aMeta->getRepresentation() == bObjMeta->getRepresentation()
&& aMeta->getRepresentation() != MetatypeRepresentation::Thin)
continue;
// Function types are interchangeable if they're also ABI-compatible.
if (auto aFunc = aa.getAs<SILFunctionType>())
if (auto bFunc = bb.getAs<SILFunctionType>()) {
// FIXME
requireABICompatibleFunctionTypes(aFunc, bFunc, what);
return true;
}
// Metatypes are interchangeable with metatypes with the same
// representation.
if (auto aMeta = aa.getAs<MetatypeType>())
if (auto bMeta = bb.getAs<MetatypeType>())
if (aMeta->getRepresentation() == bMeta->getRepresentation())
continue;
// Other types must match exactly.
return false;
}
return true;
};
// Check the return value.
auto result1 = type1->getResult();
auto result2 = type2->getResult();
_require(result1.getConvention() == result2.getConvention(), what,
complain("Different return value conventions"));
_require(areABICompatibleParamsOrReturns(result1.getSILType(),
result2.getSILType()), what,
complain("ABI-incompatible return values"));
// Our error result conventions are designed to be ABI compatible
// with functions lacking error results. Just make sure that the
// actual conventions match up.
if (type1->hasErrorResult() && type2->hasErrorResult()) {
auto error1 = type1->getErrorResult();
auto error2 = type2->getErrorResult();
_require(error1.getConvention() == error2.getConvention(), what,
complain("Different error result conventions"));
_require(areABICompatibleParamsOrReturns(error1.getSILType(),
error2.getSILType()), what,
complain("ABI-incompatible error results"));
}
// Check the parameters.
// TODO: Could allow known-empty types to be inserted or removed, but SIL
// doesn't know what empty types are yet.
_require(type1->getParameters().size() == type2->getParameters().size(),
what, complain("different number of parameters"));
for (unsigned i : indices(type1->getParameters())) {
auto param1 = type1->getParameters()[i];
auto param2 = type2->getParameters()[i];
_require(param1.getConvention() == param2.getConvention(), what,
complainBy([=] {
llvm::dbgs() << "Different conventions for parameter " << i;
}));
_require(areABICompatibleParamsOrReturns(param1.getSILType(),
param2.getSILType()), what,
complainBy([=] {
llvm::dbgs() << "ABI-incompatible types for parameter " << i;
}));
}
}
void requireSameFunctionComponents(CanSILFunctionType type1,
CanSILFunctionType type2,
const Twine &what) {
require(type1->getResult() == type2->getResult(),
"result types of " + what + " do not match");
require(type1->getParameters().size() ==
type2->getParameters().size(),
"inputs of " + what + " do not match in count");
for (auto i : indices(type1->getParameters())) {
require(type1->getParameters()[i] ==
type2->getParameters()[i],
"input " + Twine(i) + " of " + what + " do not match");
}
}
SILVerifier(const SILFunction &F)
: M(F.getModule().getSwiftModule()), F(F), TC(F.getModule().Types),
Dominance(nullptr) {
if (F.isExternalDeclaration())
return;
// Check to make sure that all blocks are well formed. If not, the
// SILVerifier object will explode trying to compute dominance info.
for (auto &BB : F) {
require(!BB.empty(), "Basic blocks cannot be empty");
require(isa<TermInst>(BB.back()),
"Basic blocks must end with a terminator instruction");
}
Dominance = new DominanceInfo(const_cast<SILFunction*>(&F));
auto *DebugScope = F.getDebugScope();
require(DebugScope, "All SIL functions must have a debug scope");
require(DebugScope && DebugScope->SILFn == &F,
"Scope of SIL function points to different function");
}
~SILVerifier() {
if (Dominance)
delete Dominance;
}
void visitSILArgument(SILArgument *arg) {
checkLegalTypes(arg->getFunction(), arg);
}
void visitSILInstruction(SILInstruction *I) {
CurInstruction = I;
checkSILInstruction(I);
// Check the SILLLocation attached to the instruction.
checkInstructionsSILLocation(I);
checkLegalTypes(I->getFunction(), I);
}
void checkSILInstruction(SILInstruction *I) {
const SILBasicBlock *BB = I->getParent();
require(BB, "Instruction with null parent");
require(I->getFunction(), "Instruction not in function");
// Check that non-terminators look ok.
if (!isa<TermInst>(I)) {
require(!BB->empty(), "Can't be in a parent block if it is empty");
require(&*BB->rbegin() != I,
"Non-terminators cannot be the last in a block");
} else {
// Skip the check for UnreachableInst, if explicitly asked to do so.
if (!isa<UnreachableInst>(I) || !SkipUnreachableMustBeLastErrors)
require(&*BB->rbegin() == I,
"Terminator must be the last in block");
}
// Verify that all of our uses are in this function.
for (Operand *use : I->getUses()) {
auto user = use->getUser();
require(user, "instruction user is null?");
require(isa<SILInstruction>(user),
"instruction used by non-instruction");
auto userI = cast<SILInstruction>(user);
require(userI->getParent(),
"instruction used by unparented instruction");
require(userI->getFunction() == &F,
"instruction used by instruction in different function");
auto operands = userI->getAllOperands();
require(operands.begin() <= use && use <= operands.end(),
"use doesn't actually belong to instruction it claims to");
}
// Verify some basis structural stuff about an instruction's operands.
for (auto &operand : I->getAllOperands()) {
require(operand.get().isValid(), "instruction has null operand");
if (auto *valueI = dyn_cast<SILInstruction>(operand.get())) {
require(valueI->getParent(),
"instruction uses value of unparented instruction");
require(valueI->getFunction() == &F,
"instruction uses value of instruction from another function");
require(Dominance->properlyDominates(valueI, I),
"instruction isn't dominated by its operand");
}
if (auto *valueBBA = dyn_cast<SILArgument>(operand.get())) {
require(valueBBA->getParent(),
"instruction uses value of unparented instruction");
require(valueBBA->getFunction() == &F,
"bb argument value from another function");
require(Dominance->dominates(valueBBA->getParent(), I->getParent()),
"instruction isn't dominated by its bb argument operand");
}
require(operand.getUser() == I,
"instruction's operand's owner isn't the instruction");
require(isInValueUses(&operand), "operand value isn't used by operand");
// Make sure that if operand is generic that its primary archetypes match
// the function context.
checkLegalTypes(I->getFunction(), operand.get().getDef());
}
}
/// Return the SIL function of a SILDebugScope's ancestor.
static SILFunction *getFunction(const SILDebugScope *DS) {
if (DS->InlinedCallSite)
return getFunction(DS->InlinedCallSite);
if (DS->Parent)
return getFunction(DS->Parent);
return DS->SILFn;
}
void checkInstructionsSILLocation(SILInstruction *I) {
// Check the debug scope.
auto *DS = I->getDebugScope();
if (DS && !maybeScopeless(*I)) {
require(DS, "instruction has a location, but no scope");
require(getFunction(DS) == I->getFunction(),
"parent scope of instruction points to a different function");
}
require(!DS || DS->InlinedCallSite || DS->SILFn == I->getFunction(),
"scope of a non-inlined instruction points to different function");
// Check the location kind.
SILLocation L = I->getLoc();
SILLocation::LocationKind LocKind = L.getKind();
ValueKind InstKind = I->getKind();
// Regular locations and SIL file locations are allowed on all instructions.
if (LocKind == SILLocation::RegularKind ||
LocKind == SILLocation::SILFileKind)
return;
#if 0
// FIXME: This check was tautological before the removal of
// AutoreleaseReturnInst, and it turns out that we're violating it.
// Fix incoming.
if (LocKind == SILLocation::CleanupKind ||
LocKind == SILLocation::InlinedKind)
require(InstKind != ValueKind::ReturnInst ||
InstKind != ValueKind::AutoreleaseReturnInst,
"cleanup and inlined locations are not allowed on return instructions");
#endif
if (LocKind == SILLocation::ReturnKind ||
LocKind == SILLocation::ImplicitReturnKind)
require(InstKind == ValueKind::BranchInst ||
InstKind == ValueKind::ReturnInst ||
InstKind == ValueKind::UnreachableInst,
"return locations are only allowed on branch and return instructions");
if (LocKind == SILLocation::ArtificialUnreachableKind)
require(InstKind == ValueKind::UnreachableInst,
"artificial locations are only allowed on Unreachable instructions");
}
/// Check that the types of this value producer are all legal in the function
/// context in which it exists.
void checkLegalTypes(SILFunction *F, ValueBase *value) {
for (auto type : value->getTypes()) {
checkLegalType(F, type);
}
}
/// Check that the given type is a legal SIL value.
void checkLegalType(SILFunction *F, SILType type) {
auto rvalueType = type.getSwiftRValueType();
require(!isa<LValueType>(rvalueType),
"l-value types are not legal in SIL");
require(!isa<AnyFunctionType>(rvalueType),
"AST function types are not legal in SIL");
rvalueType.visit([&](Type t) {
auto *A = dyn_cast<ArchetypeType>(t.getPointer());
if (!A)
return;
require(isArchetypeValidInFunction(A, F),
"Operand is of an ArchetypeType that does not exist in the "
"Caller's generic param list.");
});
}
/// Check that this operand appears in the use-chain of the value it uses.
static bool isInValueUses(const Operand *operand) {
for (auto use : operand->get()->getUses())
if (use == operand)
return true;
return false;
}
/// \return True if all of the users of the AllocStack instruction \p ASI are
/// inside the same basic block.
static bool isSingleBlockUsage(AllocStackInst *ASI, DominanceInfo *Dominance){
SILBasicBlock *BB = ASI->getParent();
for (auto UI = ASI->use_begin(), E = ASI->use_end(); UI != E; ++UI)
if (UI->getUser()->getParent() != BB &&
Dominance->isReachableFromEntry(UI->getUser()->getParent()))
return false;
return true;
}
void checkAllocStackInst(AllocStackInst *AI) {
require(AI->getContainerResult().getType().isLocalStorage(),
"first result of alloc_stack must be local storage");
require(AI->getAddressResult().getType().isAddress(),
"second result of alloc_stack must be an address type");
require(AI->getContainerResult().getType().getSwiftRValueType()
== AI->getElementType().getSwiftRValueType(),
"container storage must be for allocated type");
// Scan the parent block of AI and check that the users of AI inside this
// block are inside the lifetime of the allocated memory.
SILBasicBlock *SBB = AI->getParent();
bool Allocated = true;
for (auto Inst = AI->getIterator(), E = SBB->end(); Inst != E; ++Inst) {
if (LoadInst *LI = dyn_cast<LoadInst>(Inst))
if (LI->getOperand().getDef() == AI)
require(Allocated, "AllocStack used by Load outside its lifetime");
if (StoreInst *SI = dyn_cast<StoreInst>(Inst))
if (SI->getDest().getDef() == AI)
require(Allocated, "AllocStack used by Store outside its lifetime");
if (DeallocStackInst *DSI = dyn_cast<DeallocStackInst>(Inst))
if (DSI->getOperand() == AI)
Allocated = false;
}
// If the AllocStackInst is also deallocated inside the allocation block
// then make sure that all the users are inside that block.
if (!Allocated) {
require(isSingleBlockUsage(AI, Dominance),
"AllocStack has users in other basic blocks after allocation");
}
}
void checkAllocRefInst(AllocRefInst *AI) {
requireReferenceValue(AI, "Result of alloc_ref");
}
void checkAllocRefDynamicInst(AllocRefDynamicInst *ARDI) {
requireReferenceValue(ARDI, "Result of alloc_ref_dynamic");
require(ARDI->getOperand().getType().is<AnyMetatypeType>(),
"operand of alloc_ref_dynamic must be of metatype type");
auto metaTy = ARDI->getOperand().getType().castTo<AnyMetatypeType>();
require(metaTy->hasRepresentation(),
"operand of alloc_ref_dynamic must have a metatype representation");
if (ARDI->isObjC()) {
require(metaTy->getRepresentation() == MetatypeRepresentation::ObjC,
"alloc_ref_dynamic @objc requires operand of ObjC metatype");
} else {
require(metaTy->getRepresentation() == MetatypeRepresentation::Thick,
"alloc_ref_dynamic requires operand of thick metatype");
}
}
/// Check the substitutions passed to an apply or partial_apply.
CanSILFunctionType checkApplySubstitutions(ArrayRef<Substitution> subs,
SILType calleeTy) {
auto fnTy = requireObjectType(SILFunctionType, calleeTy, "callee operand");
// If there are substitutions, verify them and apply them to the callee.
if (subs.empty()) {
require(!fnTy->isPolymorphic(),
"callee of apply without substitutions must not be polymorphic");
return fnTy;
}
require(fnTy->isPolymorphic(),
"callee of apply with substitutions must be polymorphic");
// Apply the substitutions.
return fnTy->substGenericArgs(F.getModule(), M, subs);
}
void checkFullApplySite(FullApplySite site) {
// If we have a substitution whose replacement type is an archetype, make
// sure that the replacement archetype is in the context generic params of
// the caller function.
// For each substitution Sub in AI...
for (auto &Sub : site.getSubstitutions()) {
// If Sub's replacement is not an archetype type or is from an opened
// existential type, skip it...
auto *A = Sub.getReplacement()->getAs<ArchetypeType>();
if (!A)
continue;
require(isArchetypeValidInFunction(A, site.getInstruction()->getFunction()),
"Archetype to be substituted must be valid in function.");
}
// Then make sure that we have a type that can be substituted for the
// callee.
auto substTy = checkApplySubstitutions(site.getSubstitutions(),
site.getCallee().getType());
require(site.getOrigCalleeType()->getRepresentation() ==
site.getSubstCalleeType()->getRepresentation(),
"calling convention difference between types");
require(!site.getSubstCalleeType()->isPolymorphic(),
"substituted callee type should not be generic");
requireSameType(SILType::getPrimitiveObjectType(substTy),
SILType::getPrimitiveObjectType(site.getSubstCalleeType()),
"substituted callee type does not match substitutions");
// Check that the arguments and result match.
require(site.getArguments().size() ==
substTy->getParameters().size(),
"apply doesn't have right number of arguments for function");
for (size_t i = 0, size = site.getArguments().size(); i < size; ++i) {
requireSameType(site.getArguments()[i].getType(),
substTy->getParameters()[i].getSILType(),
"operand of 'apply' doesn't match function input type");
}
}
void checkApplyInst(ApplyInst *AI) {
checkFullApplySite(AI);
auto substTy = AI->getSubstCalleeType();
require(AI->getType() == substTy->getResult().getSILType(),
"type of apply instruction doesn't match function result type");
if (AI->isNonThrowing()) {
require(substTy->hasErrorResult(),
"nothrow flag used for callee without error result");
} else {
require(!substTy->hasErrorResult(),
"apply instruction cannot call function with error result");
}
// Check that if the apply is of a noreturn callee, make sure that an
// unreachable is the next instruction.
if (AI->getModule().getStage() == SILStage::Raw ||
!AI->getCallee().getType().getAs<SILFunctionType>()->isNoReturn())
return;
require(isa<UnreachableInst>(std::next(SILBasicBlock::iterator(AI))),
"No return apply without an unreachable as a next instruction.");
}
void checkTryApplyInst(TryApplyInst *AI) {
checkFullApplySite(AI);
auto substTy = AI->getSubstCalleeType();
auto normalBB = AI->getNormalBB();
require(normalBB->bbarg_size() == 1,
"normal destination of try_apply must take one argument");
requireSameType((*normalBB->bbarg_begin())->getType(),
substTy->getResult().getSILType(),
"normal destination of try_apply must take argument "
"of normal result type");
auto errorBB = AI->getErrorBB();
require(substTy->hasErrorResult(),
"try_apply must call function with error result");
require(errorBB->bbarg_size() == 1,
"error destination of try_apply must take one argument");
requireSameType((*errorBB->bbarg_begin())->getType(),
substTy->getErrorResult().getSILType(),
"error destination of try_apply must take argument "
"of error result type");
}
void verifyLLVMIntrinsic(BuiltinInst *BI, llvm::Intrinsic::ID ID) {
// Certain llvm intrinsic require constant values as their operands.
// Consequently, these must not be phi nodes (aka. basic block arguments).
switch (ID) {
default:
break;
case llvm::Intrinsic::ctlz: // llvm.ctlz
case llvm::Intrinsic::cttz: // llvm.cttz
break;
case llvm::Intrinsic::memcpy:
case llvm::Intrinsic::memmove:
case llvm::Intrinsic::memset:
require(!isa<SILArgument>(BI->getArguments()[3]),
"alignment argument of memory intrinsics must be an integer "
"literal");
require(!isa<SILArgument>(BI->getArguments()[4]),
"isvolatile argument of memory intrinsics must be an integer "
"literal");
break;
case llvm::Intrinsic::lifetime_start:
case llvm::Intrinsic::lifetime_end:
case llvm::Intrinsic::invariant_start:
require(!isa<SILArgument>(BI->getArguments()[0]),
"size argument of memory use markers must be an integer literal");
break;
case llvm::Intrinsic::invariant_end:
require(!isa<SILArgument>(BI->getArguments()[1]),
"llvm.invariant.end parameter #2 must be an integer literal");
break;
}
}
void checkPartialApplyInst(PartialApplyInst *PAI) {
auto resultInfo = requireObjectType(SILFunctionType, PAI,
"result of partial_apply");
verifySILFunctionType(resultInfo);
require(resultInfo->getExtInfo().hasContext(),
"result of closure cannot have a thin function type");
// If we have a substitution whose replacement type is an archetype, make
// sure that the replacement archetype is in the context generic params of
// the caller function.
// For each substitution Sub in AI...
for (auto &Sub : PAI->getSubstitutions()) {
// If Sub's replacement is not an archetype type or is from an opened
// existential type, skip it...
Sub.getReplacement().visit([&](Type t) {
auto *A = t->getAs<ArchetypeType>();
if (!A)
return;
require(isArchetypeValidInFunction(A, PAI->getFunction()),
"Archetype to be substituted must be valid in function.");
});
}
auto substTy = checkApplySubstitutions(PAI->getSubstitutions(),
PAI->getCallee().getType());
require(!PAI->getSubstCalleeType()->isPolymorphic(),
"substituted callee type should not be generic");
requireSameType(SILType::getPrimitiveObjectType(substTy),
SILType::getPrimitiveObjectType(PAI->getSubstCalleeType()),
"substituted callee type does not match substitutions");
// The arguments must match the suffix of the original function's input
// types.
require(PAI->getArguments().size() +
resultInfo->getParameters().size()
== substTy->getParameters().size(),
"result of partial_apply should take as many inputs as were not "
"applied by the instruction");
unsigned offset =
substTy->getParameters().size() - PAI->getArguments().size();
for (unsigned i = 0, size = PAI->getArguments().size(); i < size; ++i) {
require(PAI->getArguments()[i].getType()
== substTy->getParameters()[i + offset].getSILType(),
"applied argument types do not match suffix of function type's "
"inputs");
}
// The arguments to the result function type must match the prefix of the
// original function's input types.
for (unsigned i = 0, size = resultInfo->getParameters().size();
i < size; ++i) {
require(resultInfo->getParameters()[i] ==
substTy->getParameters()[i],
"inputs to result function type do not match unapplied inputs "
"of original function");
}
// The "returns inner pointer" convention doesn't survive through a partial
// application, since the thunk takes responsibility for lifetime-extending
// 'self'.
auto expectedResult = substTy->getResult();
if (expectedResult.getConvention() == ResultConvention::UnownedInnerPointer)
{
expectedResult = SILResultInfo(expectedResult.getType(),
ResultConvention::Unowned);
require(resultInfo->getResult() == expectedResult,
"result type of result function type for partially applied "
"@unowned_inner_pointer function should have @unowned convention");
} else {
require(resultInfo->getResult() == expectedResult,
"result type of result function type does not match original "
"function");
}
}
void checkBuiltinInst(BuiltinInst *BI) {
// Check for special constraints on llvm intrinsics.
if (BI->getIntrinsicInfo().ID != llvm::Intrinsic::not_intrinsic)
verifyLLVMIntrinsic(BI, BI->getIntrinsicInfo().ID);
}
bool isValidLinkageForFragileRef(SILLinkage linkage) {
switch (linkage) {
case SILLinkage::Private:
case SILLinkage::PrivateExternal:
case SILLinkage::Hidden:
case SILLinkage::HiddenExternal:
return false;
case SILLinkage::Shared:
case SILLinkage::SharedExternal:
// This handles some kind of generated functions, like constructors
// of clang imported types.
// TODO: check why those functions are not fragile anyway and make
// a less conservative check here.
return true;
case SILLinkage::Public:
case SILLinkage::PublicExternal:
return true;
}
}
void checkFunctionRefInst(FunctionRefInst *FRI) {
auto fnType = requireObjectType(SILFunctionType, FRI,
"result of function_ref");
require(!fnType->getExtInfo().hasContext(),
"function_ref should have a context-free function result");
if (F.isFragile()) {
SILFunction *RefF = FRI->getReferencedFunction();
require(RefF->isFragile()
|| isValidLinkageForFragileRef(RefF->getLinkage())
|| RefF->isExternalDeclaration(),
"function_ref inside fragile function cannot "
"reference a private or hidden symbol");
}
verifySILFunctionType(fnType);
}
void checkGlobalAddrInst(GlobalAddrInst *GAI) {
require(GAI->getType().isAddress(),
"global_addr must have an address result type");
require(GAI->getType().getObjectType() ==
GAI->getReferencedGlobal()->getLoweredType(),
"global_addr must be the address type of the variable it "
"references");
if (F.isFragile()) {
SILGlobalVariable *RefG = GAI->getReferencedGlobal();
require(RefG->isFragile()
|| isValidLinkageForFragileRef(RefG->getLinkage()),
"global_addr inside fragile function cannot "
"reference a private or hidden symbol");
}
}
void checkIntegerLiteralInst(IntegerLiteralInst *ILI) {
require(ILI->getType().is<BuiltinIntegerType>(),
"invalid integer literal type");
}
void checkLoadInst(LoadInst *LI) {
require(LI->getType().isObject(), "Result of load must be an object");
require(LI->getOperand().getType().isAddress(),
"Load operand must be an address");
require(LI->getOperand().getType().getObjectType() == LI->getType(),
"Load operand type and result type mismatch");
}
void checkStoreInst(StoreInst *SI) {
require(SI->getSrc().getType().isObject(),
"Can't store from an address source");
require(SI->getDest().getType().isAddress(),
"Must store to an address dest");
require(SI->getDest().getType().getObjectType() == SI->getSrc().getType(),
"Store operand type and dest type mismatch");
}
void checkAssignInst(AssignInst *AI) {
SILValue Src = AI->getSrc(), Dest = AI->getDest();
require(AI->getModule().getStage() == SILStage::Raw,
"assign instruction can only exist in raw SIL");
require(Src.getType().isObject(), "Can't assign from an address source");
require(Dest.getType().isAddress(), "Must store to an address dest");
require(Dest.getType().getObjectType() == Src.getType(),
"Store operand type and dest type mismatch");
}
void checkLoadUnownedInst(LoadUnownedInst *LUI) {
require(LUI->getType().isObject(), "Result of load must be an object");
auto PointerType = LUI->getOperand().getType();
auto PointerRVType = PointerType.getSwiftRValueType();
require(PointerType.isAddress() &&
PointerRVType->is<UnownedStorageType>(),
"load_unowned operand must be an unowned address");
require(PointerRVType->getReferenceStorageReferent()->getCanonicalType() ==
LUI->getType().getSwiftType(),
"Load operand type and result type mismatch");
}
void checkStoreUnownedInst(StoreUnownedInst *SUI) {
require(SUI->getSrc().getType().isObject(),
"Can't store from an address source");
auto PointerType = SUI->getDest().getType();
auto PointerRVType = PointerType.getSwiftRValueType();
require(PointerType.isAddress() &&