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//===- ExprCXX.cpp - (C++) Expression AST Node Implementation -------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the subclesses of Expr class declared in ExprCXX.h
//
//===----------------------------------------------------------------------===//
#include "clang/AST/ExprConcepts.h"
#include "clang/AST/ASTConcept.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ComputeDependence.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/DeclarationName.h"
#include "clang/AST/DependenceFlags.h"
#include "clang/AST/Expr.h"
#include "clang/AST/NestedNameSpecifier.h"
#include "clang/AST/TemplateBase.h"
#include "clang/AST/Type.h"
#include "clang/Basic/SourceLocation.h"
#include "llvm/Support/TrailingObjects.h"
#include <algorithm>
#include <string>
#include <utility>
using namespace clang;
ConceptSpecializationExpr::ConceptSpecializationExpr(
const ASTContext &C, NestedNameSpecifierLoc NNS,
SourceLocation TemplateKWLoc, DeclarationNameInfo ConceptNameInfo,
NamedDecl *FoundDecl, ConceptDecl *NamedConcept,
const ASTTemplateArgumentListInfo *ArgsAsWritten,
ImplicitConceptSpecializationDecl *SpecDecl,
const ConstraintSatisfaction *Satisfaction)
: Expr(ConceptSpecializationExprClass, C.BoolTy, VK_PRValue, OK_Ordinary),
ConceptReference(NNS, TemplateKWLoc, ConceptNameInfo, FoundDecl,
NamedConcept, ArgsAsWritten),
SpecDecl(SpecDecl),
Satisfaction(Satisfaction
? ASTConstraintSatisfaction::Create(C, *Satisfaction)
: nullptr) {
setDependence(computeDependence(this, /*ValueDependent=*/!Satisfaction));
// Currently guaranteed by the fact concepts can only be at namespace-scope.
assert(!NestedNameSpec ||
(!NestedNameSpec.getNestedNameSpecifier()->isInstantiationDependent() &&
!NestedNameSpec.getNestedNameSpecifier()
->containsUnexpandedParameterPack()));
assert((!isValueDependent() || isInstantiationDependent()) &&
"should not be value-dependent");
}
ConceptSpecializationExpr::ConceptSpecializationExpr(EmptyShell Empty)
: Expr(ConceptSpecializationExprClass, Empty) {}
ConceptSpecializationExpr *ConceptSpecializationExpr::Create(
const ASTContext &C, ConceptDecl *NamedConcept,
ImplicitConceptSpecializationDecl *SpecDecl,
const ConstraintSatisfaction *Satisfaction, bool Dependent,
bool ContainsUnexpandedParameterPack) {
return Create(C, NamedConcept, /*ArgsAsWritten*/ nullptr, SpecDecl, Satisfaction,
Dependent, ContainsUnexpandedParameterPack);
}
ConceptSpecializationExpr *ConceptSpecializationExpr::Create(
const ASTContext &C, NestedNameSpecifierLoc NNS,
SourceLocation TemplateKWLoc, DeclarationNameInfo ConceptNameInfo,
NamedDecl *FoundDecl, ConceptDecl *NamedConcept,
const ASTTemplateArgumentListInfo *ArgsAsWritten,
ImplicitConceptSpecializationDecl *SpecDecl,
const ConstraintSatisfaction *Satisfaction) {
return new (C) ConceptSpecializationExpr(
C, NNS, TemplateKWLoc, ConceptNameInfo, FoundDecl, NamedConcept,
ArgsAsWritten, SpecDecl, Satisfaction);
}
ConceptSpecializationExpr::ConceptSpecializationExpr(
const ASTContext &C, ConceptDecl *NamedConcept,
const ASTTemplateArgumentListInfo *ArgsAsWritten,
ImplicitConceptSpecializationDecl *SpecDecl,
const ConstraintSatisfaction *Satisfaction, bool Dependent,
bool ContainsUnexpandedParameterPack)
: Expr(ConceptSpecializationExprClass, C.BoolTy, VK_PRValue, OK_Ordinary),
ConceptReference(NestedNameSpecifierLoc(), SourceLocation(),
DeclarationNameInfo(), NamedConcept, NamedConcept,
ArgsAsWritten),
SpecDecl(SpecDecl),
Satisfaction(Satisfaction
? ASTConstraintSatisfaction::Create(C, *Satisfaction)
: nullptr) {
ExprDependence D = ExprDependence::None;
if (!Satisfaction)
D |= ExprDependence::Value;
if (Dependent)
D |= ExprDependence::Instantiation;
if (ContainsUnexpandedParameterPack)
D |= ExprDependence::UnexpandedPack;
setDependence(D);
}
ConceptSpecializationExpr *ConceptSpecializationExpr::Create(
const ASTContext &C, ConceptDecl *NamedConcept,
const ASTTemplateArgumentListInfo *ArgsAsWritten,
ImplicitConceptSpecializationDecl *SpecDecl,
const ConstraintSatisfaction *Satisfaction, bool Dependent,
bool ContainsUnexpandedParameterPack) {
return new (C) ConceptSpecializationExpr(C, NamedConcept, ArgsAsWritten,
SpecDecl, Satisfaction, Dependent,
ContainsUnexpandedParameterPack);
}
const TypeConstraint *
concepts::ExprRequirement::ReturnTypeRequirement::getTypeConstraint() const {
assert(isTypeConstraint());
auto TPL =
TypeConstraintInfo.getPointer().get<TemplateParameterList *>();
return cast<TemplateTypeParmDecl>(TPL->getParam(0))
->getTypeConstraint();
}
RequiresExpr::RequiresExpr(ASTContext &C, SourceLocation RequiresKWLoc,
RequiresExprBodyDecl *Body,
ArrayRef<ParmVarDecl *> LocalParameters,
ArrayRef<concepts::Requirement *> Requirements,
SourceLocation RBraceLoc)
: Expr(RequiresExprClass, C.BoolTy, VK_PRValue, OK_Ordinary),
NumLocalParameters(LocalParameters.size()),
NumRequirements(Requirements.size()), Body(Body), RBraceLoc(RBraceLoc) {
RequiresExprBits.IsSatisfied = false;
RequiresExprBits.RequiresKWLoc = RequiresKWLoc;
bool Dependent = false;
bool ContainsUnexpandedParameterPack = false;
for (ParmVarDecl *P : LocalParameters) {
Dependent |= P->getType()->isInstantiationDependentType();
ContainsUnexpandedParameterPack |=
P->getType()->containsUnexpandedParameterPack();
}
RequiresExprBits.IsSatisfied = true;
for (concepts::Requirement *R : Requirements) {
Dependent |= R->isDependent();
ContainsUnexpandedParameterPack |= R->containsUnexpandedParameterPack();
if (!Dependent) {
RequiresExprBits.IsSatisfied = R->isSatisfied();
if (!RequiresExprBits.IsSatisfied)
break;
}
}
std::copy(LocalParameters.begin(), LocalParameters.end(),
getTrailingObjects<ParmVarDecl *>());
std::copy(Requirements.begin(), Requirements.end(),
getTrailingObjects<concepts::Requirement *>());
RequiresExprBits.IsSatisfied |= Dependent;
// FIXME: move the computing dependency logic to ComputeDependence.h
if (ContainsUnexpandedParameterPack)
setDependence(getDependence() | ExprDependence::UnexpandedPack);
// FIXME: this is incorrect for cases where we have a non-dependent
// requirement, but its parameters are instantiation-dependent. RequiresExpr
// should be instantiation-dependent if it has instantiation-dependent
// parameters.
if (Dependent)
setDependence(getDependence() | ExprDependence::ValueInstantiation);
}
RequiresExpr::RequiresExpr(ASTContext &C, EmptyShell Empty,
unsigned NumLocalParameters,
unsigned NumRequirements)
: Expr(RequiresExprClass, Empty), NumLocalParameters(NumLocalParameters),
NumRequirements(NumRequirements) { }
RequiresExpr *
RequiresExpr::Create(ASTContext &C, SourceLocation RequiresKWLoc,
RequiresExprBodyDecl *Body,
ArrayRef<ParmVarDecl *> LocalParameters,
ArrayRef<concepts::Requirement *> Requirements,
SourceLocation RBraceLoc) {
void *Mem =
C.Allocate(totalSizeToAlloc<ParmVarDecl *, concepts::Requirement *>(
LocalParameters.size(), Requirements.size()),
alignof(RequiresExpr));
return new (Mem) RequiresExpr(C, RequiresKWLoc, Body, LocalParameters,
Requirements, RBraceLoc);
}
RequiresExpr *
RequiresExpr::Create(ASTContext &C, EmptyShell Empty,
unsigned NumLocalParameters, unsigned NumRequirements) {
void *Mem =
C.Allocate(totalSizeToAlloc<ParmVarDecl *, concepts::Requirement *>(
NumLocalParameters, NumRequirements),
alignof(RequiresExpr));
return new (Mem) RequiresExpr(C, Empty, NumLocalParameters, NumRequirements);
}
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