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GenericSignature.cpp
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//===--- GenericSignature.cpp - Generic Signature AST ---------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements the GenericSignature class.
//
//===----------------------------------------------------------------------===//
#include "GenericSignatureBuilderImpl.h"
#include "swift/AST/GenericSignature.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/GenericSignatureBuilder.h"
#include "swift/AST/Decl.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/Module.h"
#include "swift/AST/PrettyStackTrace.h"
#include "swift/AST/Types.h"
#include "swift/Basic/SourceManager.h"
#include "swift/Basic/STLExtras.h"
#include "RequirementMachine/RequirementMachine.h"
#include <functional>
using namespace swift;
void ConformanceAccessPath::print(raw_ostream &out) const {
llvm::interleave(
begin(), end(),
[&](const Entry &entry) {
entry.first.print(out);
out << ": " << entry.second->getName();
},
[&] { out << " -> "; });
}
void ConformanceAccessPath::dump() const {
print(llvm::errs());
llvm::errs() << "\n";
}
GenericSignatureImpl::GenericSignatureImpl(
TypeArrayView<GenericTypeParamType> params,
ArrayRef<Requirement> requirements, bool isKnownCanonical)
: NumGenericParams(params.size()), NumRequirements(requirements.size()),
CanonicalSignatureOrASTContext() {
std::uninitialized_copy(params.begin(), params.end(),
getTrailingObjects<Type>());
std::uninitialized_copy(requirements.begin(), requirements.end(),
getTrailingObjects<Requirement>());
#ifndef NDEBUG
// Make sure generic parameters are in the right order, and
// none are missing.
unsigned depth = 0;
unsigned count = 0;
for (auto param : params) {
if (param->getDepth() != depth) {
assert(param->getDepth() > depth && "Generic parameter depth mismatch");
depth = param->getDepth();
count = 0;
}
assert(param->getIndex() == count && "Generic parameter index mismatch");
++count;
}
#endif
if (isKnownCanonical)
CanonicalSignatureOrASTContext =
&GenericSignature::getASTContext(params, requirements);
}
TypeArrayView<GenericTypeParamType>
GenericSignatureImpl::getInnermostGenericParams() const {
const auto params = getGenericParams();
const unsigned maxDepth = params.back()->getDepth();
if (params.front()->getDepth() == maxDepth)
return params;
// There is a depth change. Count the number of elements
// to slice off the front.
unsigned sliceCount = params.size() - 1;
while (true) {
if (params[sliceCount - 1]->getDepth() != maxDepth)
break;
--sliceCount;
}
return params.slice(sliceCount);
}
void GenericSignatureImpl::forEachParam(
llvm::function_ref<void(GenericTypeParamType *, bool)> callback) const {
// Figure out which generic parameters are concrete or same-typed to another
// type parameter.
auto genericParams = getGenericParams();
auto genericParamsAreCanonical =
SmallVector<bool, 4>(genericParams.size(), true);
for (auto req : getRequirements()) {
if (req.getKind() != RequirementKind::SameType) continue;
GenericTypeParamType *gp;
if (auto secondGP = req.getSecondType()->getAs<GenericTypeParamType>()) {
// If two generic parameters are same-typed, then the right-hand one
// is non-canonical.
assert(req.getFirstType()->is<GenericTypeParamType>());
gp = secondGP;
} else {
// Otherwise, the right-hand side is an associated type or concrete type,
// and the left-hand one is non-canonical.
gp = req.getFirstType()->getAs<GenericTypeParamType>();
if (!gp) continue;
// If an associated type is same-typed, it doesn't constrain the generic
// parameter itself. That is, if T == U.Foo, then T is canonical, whereas
// U.Foo is not.
if (req.getSecondType()->isTypeParameter()) continue;
}
unsigned index = GenericParamKey(gp).findIndexIn(genericParams);
genericParamsAreCanonical[index] = false;
}
// Call the callback with each parameter and the result of the above analysis.
for (auto index : indices(genericParams))
callback(genericParams[index], genericParamsAreCanonical[index]);
}
bool GenericSignatureImpl::areAllParamsConcrete() const {
unsigned numConcreteGenericParams = 0;
for (const auto &req : getRequirements()) {
if (req.getKind() != RequirementKind::SameType) continue;
if (!req.getFirstType()->is<GenericTypeParamType>()) continue;
if (req.getSecondType()->isTypeParameter()) continue;
++numConcreteGenericParams;
}
return numConcreteGenericParams == getGenericParams().size();
}
ASTContext &GenericSignature::getASTContext(
TypeArrayView<GenericTypeParamType> params,
ArrayRef<swift::Requirement> requirements) {
// The params and requirements cannot both be empty.
if (!params.empty())
return params.front()->getASTContext();
else
return requirements.front().getFirstType()->getASTContext();
}
/// Retrieve the generic parameters.
TypeArrayView<GenericTypeParamType> GenericSignature::getGenericParams() const {
return isNull()
? TypeArrayView<GenericTypeParamType>{}
: getPointer()->getGenericParams();
}
/// Retrieve the innermost generic parameters.
///
/// Given a generic signature for a nested generic type, produce an
/// array of the generic parameters for the innermost generic type.
TypeArrayView<GenericTypeParamType> GenericSignature::getInnermostGenericParams() const {
return isNull()
? TypeArrayView<GenericTypeParamType>{}
: getPointer()->getInnermostGenericParams();
}
/// Retrieve the requirements.
ArrayRef<Requirement> GenericSignature::getRequirements() const {
return isNull()
? ArrayRef<Requirement>{}
: getPointer()->getRequirements();
}
GenericSignatureBuilder *
GenericSignatureImpl::getGenericSignatureBuilder() const {
// The generic signature builder is associated with the canonical signature.
if (!isCanonical())
return getCanonicalSignature()->getGenericSignatureBuilder();
// generic signature builders are stored on the ASTContext.
return getASTContext().getOrCreateGenericSignatureBuilder(
CanGenericSignature(this));
}
rewriting::RequirementMachine *
GenericSignatureImpl::getRequirementMachine() const {
if (Machine)
return Machine;
const_cast<GenericSignatureImpl *>(this)->Machine
= getASTContext().getOrCreateRequirementMachine(
getCanonicalSignature());
return Machine;
}
bool GenericSignatureImpl::isEqual(GenericSignature Other) const {
return getCanonicalSignature() == Other.getCanonicalSignature();
}
bool GenericSignatureImpl::isCanonical() const {
if (CanonicalSignatureOrASTContext.is<ASTContext *>())
return true;
return getCanonicalSignature().getPointer() == this;
}
CanGenericSignature
CanGenericSignature::getCanonical(TypeArrayView<GenericTypeParamType> params,
ArrayRef<Requirement> requirements) {
// Canonicalize the parameters and requirements.
SmallVector<GenericTypeParamType*, 8> canonicalParams;
canonicalParams.reserve(params.size());
for (auto param : params) {
canonicalParams.push_back(cast<GenericTypeParamType>(param->getCanonicalType()));
}
SmallVector<Requirement, 8> canonicalRequirements;
canonicalRequirements.reserve(requirements.size());
for (auto &reqt : requirements)
canonicalRequirements.push_back(reqt.getCanonical());
auto canSig = get(canonicalParams, canonicalRequirements,
/*isKnownCanonical=*/true);
return CanGenericSignature(canSig);
}
CanGenericSignature GenericSignature::getCanonicalSignature() const {
// If the underlying pointer is null, return `CanGenericSignature()`.
if (isNull())
return CanGenericSignature();
// Otherwise, return the canonical signature of the underlying pointer.
return getPointer()->getCanonicalSignature();
}
CanGenericSignature GenericSignatureImpl::getCanonicalSignature() const {
// If we haven't computed the canonical signature yet, do so now.
if (CanonicalSignatureOrASTContext.isNull()) {
// Compute the canonical signature.
auto canSig = CanGenericSignature::getCanonical(getGenericParams(),
getRequirements());
// Record either the canonical signature or an indication that
// this is the canonical signature.
if (canSig.getPointer() != this)
CanonicalSignatureOrASTContext = canSig.getPointer();
else
CanonicalSignatureOrASTContext = &getGenericParams()[0]->getASTContext();
// Return the canonical signature.
return canSig;
}
// A stored ASTContext indicates that this is the canonical
// signature.
if (CanonicalSignatureOrASTContext.is<ASTContext *>())
return CanGenericSignature(this);
// Otherwise, return the stored canonical signature.
return CanGenericSignature(
CanonicalSignatureOrASTContext.get<const GenericSignatureImpl *>());
}
GenericEnvironment *GenericSignature::getGenericEnvironment() const {
if (isNull())
return nullptr;
return getPointer()->getGenericEnvironment();
}
GenericEnvironment *GenericSignatureImpl::getGenericEnvironment() const {
if (GenericEnv == nullptr) {
const auto impl = const_cast<GenericSignatureImpl *>(this);
impl->GenericEnv = GenericEnvironment::getIncomplete(this);
}
return GenericEnv;
}
GenericSignature::LocalRequirements
GenericSignatureImpl::getLocalRequirements(Type depType) const {
assert(depType->isTypeParameter() && "Expected a type parameter here");
auto computeViaGSB = [&]() {
GenericSignature::LocalRequirements result;
auto &builder = *getGenericSignatureBuilder();
auto resolved =
builder.maybeResolveEquivalenceClass(
depType,
ArchetypeResolutionKind::CompleteWellFormed,
/*wantExactPotentialArchetype=*/false);
if (!resolved) {
result.concreteType = ErrorType::get(depType);
return result;
}
if (auto concreteType = resolved.getAsConcreteType()) {
result.concreteType = concreteType;
return result;
}
auto *equivClass = resolved.getEquivalenceClass(builder);
auto genericParams = getGenericParams();
result.anchor = equivClass->getAnchor(builder, genericParams);
if (equivClass->concreteType) {
result.concreteType = equivClass->concreteType;
return result;
}
result.superclass = equivClass->superclass;
for (const auto &conforms : equivClass->conformsTo) {
auto proto = conforms.first;
if (!equivClass->isConformanceSatisfiedBySuperclass(proto))
result.protos.push_back(proto);
}
result.layout = equivClass->layout;
return result;
};
auto computeViaRQM = [&]() {
auto *machine = getRequirementMachine();
return machine->getLocalRequirements(depType, getGenericParams());
};
auto &ctx = getASTContext();
switch (ctx.LangOpts.EnableRequirementMachine) {
case RequirementMachineMode::Disabled:
return computeViaGSB();
case RequirementMachineMode::Enabled:
return computeViaRQM();
case RequirementMachineMode::Verify: {
auto rqmResult = computeViaRQM();
auto gsbResult = computeViaGSB();
auto typesEqual = [&](Type lhs, Type rhs, bool canonical) {
if (!lhs || !rhs)
return !lhs == !rhs;
if (lhs->isEqual(rhs))
return true;
if (canonical)
return false;
if (getCanonicalTypeInContext(lhs) ==
getCanonicalTypeInContext(rhs))
return true;
return false;
};
auto compare = [&]() {
// If the types are concrete, we don't care about the rest.
if (gsbResult.concreteType || rqmResult.concreteType) {
if (!typesEqual(gsbResult.concreteType,
rqmResult.concreteType,
false))
return false;
return true;
}
if (!typesEqual(gsbResult.anchor,
rqmResult.anchor,
true))
return false;
if (gsbResult.layout != rqmResult.layout)
return false;
auto lhsProtos = gsbResult.protos;
ProtocolType::canonicalizeProtocols(lhsProtos);
auto rhsProtos = rqmResult.protos;
ProtocolType::canonicalizeProtocols(rhsProtos);
if (lhsProtos != rhsProtos)
return false;
if (!typesEqual(gsbResult.superclass,
rqmResult.superclass,
false))
return false;
return true;
};
auto dumpReqs = [&](const GenericSignature::LocalRequirements &reqs) {
if (reqs.anchor) {
llvm::errs() << "- Anchor: " << reqs.anchor << "\n";
reqs.anchor.dump(llvm::errs());
}
if (reqs.concreteType) {
llvm::errs() << "- Concrete type: " << reqs.concreteType << "\n";
reqs.concreteType.dump(llvm::errs());
}
if (reqs.superclass) {
llvm::errs() << "- Superclass: " << reqs.superclass << "\n";
reqs.superclass.dump(llvm::errs());
}
if (reqs.layout) {
llvm::errs() << "- Layout: " << reqs.layout << "\n";
}
for (const auto *proto : reqs.protos) {
llvm::errs() << "- Conforms to: " << proto->getName() << "\n";
}
};
if (!compare()) {
llvm::errs() << "RequirementMachine::getLocalRequirements() is broken\n";
llvm::errs() << "Generic signature: " << GenericSignature(this) << "\n";
llvm::errs() << "Dependent type: "; depType.dump(llvm::errs());
llvm::errs() << "GenericSignatureBuilder says:\n";
dumpReqs(gsbResult);
llvm::errs() << "\n";
llvm::errs() << "RequirementMachine says:\n";
dumpReqs(rqmResult);
llvm::errs() << "\n";
getRequirementMachine()->dump(llvm::errs());
abort();
}
return rqmResult;
}
}
}
ASTContext &GenericSignatureImpl::getASTContext() const {
// Canonical signatures store the ASTContext directly.
if (auto ctx = CanonicalSignatureOrASTContext.dyn_cast<ASTContext *>())
return *ctx;
// For everything else, just get it from the generic parameter.
return GenericSignature::getASTContext(getGenericParams(), getRequirements());
}
ProtocolConformanceRef
GenericSignatureImpl::lookupConformance(CanType type,
ProtocolDecl *proto) const {
// FIXME: Actually implement this properly.
auto *M = proto->getParentModule();
if (type->isTypeParameter())
return ProtocolConformanceRef(proto);
return M->lookupConformance(type, proto, /*allowMissing=*/true);
}
bool GenericSignatureImpl::requiresClass(Type type) const {
assert(type->isTypeParameter() &&
"Only type parameters can have superclass requirements");
auto computeViaGSB = [&]() {
auto &builder = *getGenericSignatureBuilder();
auto equivClass =
builder.resolveEquivalenceClass(
type,
ArchetypeResolutionKind::CompleteWellFormed);
if (!equivClass) return false;
// If this type was mapped to a concrete type, then there is no
// requirement.
if (equivClass->concreteType) return false;
// If there is a layout constraint, it might be a class.
if (equivClass->layout && equivClass->layout->isClass()) return true;
return false;
};
auto computeViaRQM = [&]() {
auto *machine = getRequirementMachine();
return machine->requiresClass(type);
};
auto &ctx = getASTContext();
switch (ctx.LangOpts.EnableRequirementMachine) {
case RequirementMachineMode::Disabled:
return computeViaGSB();
case RequirementMachineMode::Enabled:
return computeViaRQM();
case RequirementMachineMode::Verify: {
auto rqmResult = computeViaRQM();
auto gsbResult = computeViaGSB();
if (gsbResult != rqmResult) {
llvm::errs() << "RequirementMachine::requiresClass() is broken\n";
llvm::errs() << "Generic signature: " << GenericSignature(this) << "\n";
llvm::errs() << "Dependent type: "; type.dump(llvm::errs());
llvm::errs() << "GenericSignatureBuilder says: " << gsbResult << "\n";
llvm::errs() << "RequirementMachine says: " << rqmResult << "\n";
getRequirementMachine()->dump(llvm::errs());
abort();
}
return rqmResult;
}
}
}
/// Determine the superclass bound on the given dependent type.
Type GenericSignatureImpl::getSuperclassBound(Type type) const {
assert(type->isTypeParameter() &&
"Only type parameters can have superclass requirements");
auto computeViaGSB = [&]() -> Type {
auto &builder = *getGenericSignatureBuilder();
auto equivClass =
builder.resolveEquivalenceClass(
type,
ArchetypeResolutionKind::CompleteWellFormed);
if (!equivClass) return nullptr;
// If this type was mapped to a concrete type, then there is no
// requirement.
if (equivClass->concreteType) return nullptr;
// Retrieve the superclass bound.
return equivClass->superclass;
};
auto computeViaRQM = [&]() {
auto *machine = getRequirementMachine();
return machine->getSuperclassBound(type, getGenericParams());
};
auto &ctx = getASTContext();
switch (ctx.LangOpts.EnableRequirementMachine) {
case RequirementMachineMode::Disabled:
return computeViaGSB();
case RequirementMachineMode::Enabled:
return computeViaRQM();
case RequirementMachineMode::Verify: {
auto rqmResult = computeViaRQM();
auto gsbResult = computeViaGSB();
auto check = [&]() {
if (!gsbResult || !rqmResult)
return !gsbResult == !rqmResult;
return gsbResult->isEqual(rqmResult);
};
if (!check()) {
llvm::errs() << "RequirementMachine::getSuperclassBound() is broken\n";
llvm::errs() << "Generic signature: " << GenericSignature(this) << "\n";
llvm::errs() << "Dependent type: "; type.dump(llvm::errs());
llvm::errs() << "GenericSignatureBuilder says: " << gsbResult << "\n";
if (gsbResult)
gsbResult.dump(llvm::errs());
llvm::errs() << "\n";
llvm::errs() << "RequirementMachine says: " << rqmResult << "\n";
if (rqmResult)
rqmResult.dump(llvm::errs());
llvm::errs() << "\n";
getRequirementMachine()->dump(llvm::errs());
abort();
}
return rqmResult;
}
}
}
/// Determine the set of protocols to which the given type parameter is
/// required to conform.
GenericSignature::RequiredProtocols
GenericSignatureImpl::getRequiredProtocols(Type type) const {
assert(type->isTypeParameter() && "Expected a type parameter");
auto computeViaGSB = [&]() -> GenericSignature::RequiredProtocols {
auto &builder = *getGenericSignatureBuilder();
auto equivClass =
builder.resolveEquivalenceClass(
type,
ArchetypeResolutionKind::CompleteWellFormed);
if (!equivClass) return { };
// If this type parameter was mapped to a concrete type, then there
// are no requirements.
if (equivClass->concreteType) return { };
// Retrieve the protocols to which this type conforms.
GenericSignature::RequiredProtocols result;
for (const auto &conforms : equivClass->conformsTo)
result.push_back(conforms.first);
// Canonicalize the resulting set of protocols.
ProtocolType::canonicalizeProtocols(result);
return result;
};
auto computeViaRQM = [&]() {
auto *machine = getRequirementMachine();
return machine->getRequiredProtocols(type);
};
auto &ctx = getASTContext();
switch (ctx.LangOpts.EnableRequirementMachine) {
case RequirementMachineMode::Disabled:
return computeViaGSB();
case RequirementMachineMode::Enabled:
return computeViaRQM();
case RequirementMachineMode::Verify: {
auto rqmResult = computeViaRQM();
auto gsbResult = computeViaGSB();
if (gsbResult != rqmResult) {
llvm::errs() << "RequirementMachine::getRequiredProtocols() is broken\n";
llvm::errs() << "Generic signature: " << GenericSignature(this) << "\n";
llvm::errs() << "Dependent type: "; type.dump(llvm::errs());
llvm::errs() << "GenericSignatureBuilder says: ";
for (auto *otherProto : gsbResult)
llvm::errs() << " " << otherProto->getName();
llvm::errs() << "\n";
llvm::errs() << "RequirementMachine says: ";
for (auto *otherProto : rqmResult)
llvm::errs() << " " << otherProto->getName();
llvm::errs() << "\n";
getRequirementMachine()->dump(llvm::errs());
abort();
}
return rqmResult;
}
}
}
bool GenericSignatureImpl::requiresProtocol(Type type,
ProtocolDecl *proto) const {
assert(type->isTypeParameter() && "Expected a type parameter");
auto computeViaGSB = [&]() {
auto &builder = *getGenericSignatureBuilder();
auto equivClass =
builder.resolveEquivalenceClass(
type,
ArchetypeResolutionKind::CompleteWellFormed);
if (!equivClass) return false;
// FIXME: Optionally deal with concrete conformances here
// or have a separate method do that additionally?
//
// If this type parameter was mapped to a concrete type, then there
// are no requirements.
if (equivClass->concreteType) return false;
// Check whether the representative conforms to this protocol.
return equivClass->conformsTo.count(proto) > 0;
};
auto computeViaRQM = [&]() {
auto *machine = getRequirementMachine();
return machine->requiresProtocol(type, proto);
};
auto &ctx = getASTContext();
switch (ctx.LangOpts.EnableRequirementMachine) {
case RequirementMachineMode::Disabled:
return computeViaGSB();
case RequirementMachineMode::Enabled:
return computeViaRQM();
case RequirementMachineMode::Verify: {
auto rqmResult = computeViaRQM();
auto gsbResult = computeViaGSB();
if (gsbResult != rqmResult) {
llvm::errs() << "RequirementMachine::requiresProtocol() is broken\n";
llvm::errs() << "Generic signature: " << GenericSignature(this) << "\n";
llvm::errs() << "Dependent type: "; type.dump(llvm::errs());
llvm::errs() << "Protocol: "; proto->dumpRef(llvm::errs());
llvm::errs() << "\n";
llvm::errs() << "GenericSignatureBuilder says: " << gsbResult << "\n";
llvm::errs() << "RequirementMachine says: " << rqmResult << "\n";
getRequirementMachine()->dump(llvm::errs());
abort();
}
return rqmResult;
}
}
}
/// Determine whether the given dependent type is equal to a concrete type.
bool GenericSignatureImpl::isConcreteType(Type type) const {
assert(type->isTypeParameter() && "Expected a type parameter");
auto computeViaGSB = [&]() {
auto &builder = *getGenericSignatureBuilder();
auto equivClass =
builder.resolveEquivalenceClass(
type,
ArchetypeResolutionKind::CompleteWellFormed);
if (!equivClass) return false;
return bool(equivClass->concreteType);
};
auto computeViaRQM = [&]() {
auto *machine = getRequirementMachine();
return machine->isConcreteType(type);
};
auto &ctx = getASTContext();
switch (ctx.LangOpts.EnableRequirementMachine) {
case RequirementMachineMode::Disabled:
return computeViaGSB();
case RequirementMachineMode::Enabled:
return computeViaRQM();
case RequirementMachineMode::Verify: {
auto rqmResult = computeViaRQM();
auto gsbResult = computeViaGSB();
if (gsbResult != rqmResult) {
llvm::errs() << "RequirementMachine::isConcreteType() is broken\n";
llvm::errs() << "Generic signature: " << GenericSignature(this) << "\n";
llvm::errs() << "Dependent type: "; type.dump(llvm::errs());
llvm::errs() << "\n";
llvm::errs() << "GenericSignatureBuilder says: " << gsbResult << "\n";
llvm::errs() << "RequirementMachine says: " << rqmResult << "\n";
getRequirementMachine()->dump(llvm::errs());
abort();
}
return rqmResult;
}
}
}
/// Return the concrete type that the given type parameter is constrained to,
/// or the null Type if it is not the subject of a concrete same-type
/// constraint.
Type GenericSignatureImpl::getConcreteType(Type type) const {
assert(type->isTypeParameter() && "Expected a type parameter");
auto computeViaGSB = [&]() -> Type {
auto &builder = *getGenericSignatureBuilder();
auto equivClass =
builder.resolveEquivalenceClass(
type,
ArchetypeResolutionKind::CompleteWellFormed);
if (!equivClass) return nullptr;
return equivClass->concreteType;
};
auto computeViaRQM = [&]() {
auto *machine = getRequirementMachine();
return machine->getConcreteType(type, getGenericParams());
};
auto &ctx = getASTContext();
switch (ctx.LangOpts.EnableRequirementMachine) {
case RequirementMachineMode::Disabled:
return computeViaGSB();
case RequirementMachineMode::Enabled:
return computeViaRQM();
case RequirementMachineMode::Verify: {
auto rqmResult = computeViaRQM();
auto gsbResult = computeViaGSB();
auto check = [&]() {
if (!gsbResult || !rqmResult)
return !gsbResult == !rqmResult;
if (gsbResult->isEqual(rqmResult))
return true;
return (getCanonicalTypeInContext(gsbResult)
== getCanonicalTypeInContext(rqmResult));
};
if (!check()) {
llvm::errs() << "RequirementMachine::getConcreteType() is broken\n";
llvm::errs() << "Generic signature: " << GenericSignature(this) << "\n";
llvm::errs() << "Dependent type: "; type.dump(llvm::errs());
llvm::errs() << "GenericSignatureBuilder says: " << gsbResult << "\n";
if (gsbResult)
gsbResult.dump(llvm::errs());
llvm::errs() << "\n";
llvm::errs() << "RequirementMachine says: " << rqmResult << "\n";
if (rqmResult)
rqmResult.dump(llvm::errs());
llvm::errs() << "\n";
getRequirementMachine()->dump(llvm::errs());
abort();
}
return rqmResult;
}
}
}
LayoutConstraint GenericSignatureImpl::getLayoutConstraint(Type type) const {
assert(type->isTypeParameter() &&
"Only type parameters can have layout constraints");
auto computeViaGSB = [&]() {
auto &builder = *getGenericSignatureBuilder();
auto equivClass =
builder.resolveEquivalenceClass(
type,
ArchetypeResolutionKind::CompleteWellFormed);
if (!equivClass) return LayoutConstraint();
return equivClass->layout;
};
auto computeViaRQM = [&]() {
auto *machine = getRequirementMachine();
return machine->getLayoutConstraint(type);
};
auto &ctx = getASTContext();
switch (ctx.LangOpts.EnableRequirementMachine) {
case RequirementMachineMode::Disabled:
return computeViaGSB();
case RequirementMachineMode::Enabled:
return computeViaRQM();
case RequirementMachineMode::Verify: {
auto rqmResult = computeViaRQM();
auto gsbResult = computeViaGSB();
if (gsbResult != rqmResult) {
llvm::errs() << "RequirementMachine::getLayoutConstraint() is broken\n";
llvm::errs() << "Generic signature: " << GenericSignature(this) << "\n";
llvm::errs() << "Dependent type: "; type.dump(llvm::errs());
llvm::errs() << "\n";
llvm::errs() << "GenericSignatureBuilder says: " << gsbResult << "\n";
llvm::errs() << "RequirementMachine says: " << rqmResult << "\n";
getRequirementMachine()->dump(llvm::errs());
abort();
}
return rqmResult;
}
}
}
bool GenericSignatureImpl::areSameTypeParameterInContext(Type type1,
Type type2) const {
assert(type1->isTypeParameter());
assert(type2->isTypeParameter());
if (type1.getPointer() == type2.getPointer())
return true;
auto computeViaGSB = [&]() {
return areSameTypeParameterInContext(type1, type2,
*getGenericSignatureBuilder());
};
auto computeViaRQM = [&]() {
auto *machine = getRequirementMachine();
return machine->areSameTypeParameterInContext(type1, type2);
};
auto &ctx = getASTContext();
switch (ctx.LangOpts.EnableRequirementMachine) {
case RequirementMachineMode::Disabled:
return computeViaGSB();
case RequirementMachineMode::Enabled:
return computeViaRQM();
case RequirementMachineMode::Verify: {
auto rqmResult = computeViaRQM();
auto gsbResult = computeViaGSB();
if (gsbResult != rqmResult) {
auto firstConcreteType = getConcreteType(type1);
auto secondConcreteType = getConcreteType(type2);
if (!firstConcreteType->isEqual(secondConcreteType)) {
llvm::errs() << "RequirementMachine::areSameTypeParameterInContext() is broken\n";
llvm::errs() << "Generic signature: " << GenericSignature(this) << "\n";
llvm::errs() << "First dependent type: "; type1.dump(llvm::errs());
llvm::errs() << "Second dependent type: "; type2.dump(llvm::errs());
llvm::errs() << "\n";
llvm::errs() << "GenericSignatureBuilder says: " << gsbResult << "\n";
llvm::errs() << "RequirementMachine says: " << rqmResult << "\n";
getRequirementMachine()->dump(llvm::errs());
abort();
}
}
return rqmResult;
}
}
}
bool GenericSignatureImpl::areSameTypeParameterInContext(Type type1,
Type type2,
GenericSignatureBuilder &builder) const {
assert(type1->isTypeParameter());
assert(type2->isTypeParameter());
if (type1.getPointer() == type2.getPointer())
return true;
auto equivClass1 =
builder.resolveEquivalenceClass(
type1,
ArchetypeResolutionKind::CompleteWellFormed);
assert(equivClass1 && "not a valid dependent type of this signature?");
auto equivClass2 =
builder.resolveEquivalenceClass(
type2,
ArchetypeResolutionKind::CompleteWellFormed);
assert(equivClass2 && "not a valid dependent type of this signature?");
return equivClass1 == equivClass2;
}
bool GenericSignatureImpl::isRequirementSatisfied(
Requirement requirement, bool allowMissing) const {
if (requirement.getFirstType()->hasTypeParameter()) {
auto *genericEnv = getGenericEnvironment();
auto substituted = requirement.subst(
[&](SubstitutableType *type) -> Type {
if (auto *paramType = type->getAs<GenericTypeParamType>())
return genericEnv->mapTypeIntoContext(paramType);
return type;
},
LookUpConformanceInSignature(this));
if (!substituted)
return false;
requirement = *substituted;
}
// FIXME: Need to check conditional requirements here.
ArrayRef<Requirement> conditionalRequirements;
return requirement.isSatisfied(conditionalRequirements, allowMissing);
}
SmallVector<Requirement, 4>
GenericSignature::requirementsNotSatisfiedBy(GenericSignature otherSig) const {
// The null generic signature has no requirements, therefore all requirements
// are satisfied by any signature.
if (isNull()) {
return {};
}
return getPointer()->requirementsNotSatisfiedBy(otherSig);
}
SmallVector<Requirement, 4> GenericSignatureImpl::requirementsNotSatisfiedBy(
GenericSignature otherSig) const {
SmallVector<Requirement, 4> result;
// If the signatures match by pointer, all requirements are satisfied.
if (otherSig.getPointer() == this) return result;
// If there is no other signature, no requirements are satisfied.
if (!otherSig) {
const auto reqs = getRequirements();
result.append(reqs.begin(), reqs.end());
return result;
}
// If the canonical signatures are equal, all requirements are satisfied.
if (getCanonicalSignature() == otherSig->getCanonicalSignature())
return result;
// Find the requirements that aren't satisfied.
for (const auto &req : getRequirements()) {
if (!otherSig->isRequirementSatisfied(req))