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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 <algorithm>
using namespace clang;
ConceptSpecializationExpr::ConceptSpecializationExpr(
const ASTContext &C, ConceptReference *Loc,
ImplicitConceptSpecializationDecl *SpecDecl,
const ConstraintSatisfaction *Satisfaction)
: Expr(ConceptSpecializationExprClass, C.BoolTy, VK_PRValue, OK_Ordinary),
ConceptRef(Loc), 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(!Loc->getNestedNameSpecifierLoc() ||
(!Loc->getNestedNameSpecifierLoc()
.getNestedNameSpecifier()
->isInstantiationDependent() &&
!Loc->getNestedNameSpecifierLoc()
.getNestedNameSpecifier()
->containsUnexpandedParameterPack()));
assert((!isValueDependent() || isInstantiationDependent()) &&
"should not be value-dependent");
}
ConceptSpecializationExpr::ConceptSpecializationExpr(EmptyShell Empty)
: Expr(ConceptSpecializationExprClass, Empty) {}
ConceptSpecializationExpr *
ConceptSpecializationExpr::Create(const ASTContext &C, ConceptReference *Loc,
ImplicitConceptSpecializationDecl *SpecDecl,
const ConstraintSatisfaction *Satisfaction) {
return new (C) ConceptSpecializationExpr(C, Loc, SpecDecl, Satisfaction);
}
ConceptSpecializationExpr::ConceptSpecializationExpr(
const ASTContext &C, ConceptReference *Loc,
ImplicitConceptSpecializationDecl *SpecDecl,
const ConstraintSatisfaction *Satisfaction, bool Dependent,
bool ContainsUnexpandedParameterPack)
: Expr(ConceptSpecializationExprClass, C.BoolTy, VK_PRValue, OK_Ordinary),
ConceptRef(Loc), 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, ConceptReference *Loc,
ImplicitConceptSpecializationDecl *SpecDecl,
const ConstraintSatisfaction *Satisfaction,
bool Dependent,
bool ContainsUnexpandedParameterPack) {
return new (C)
ConceptSpecializationExpr(C, Loc, SpecDecl, Satisfaction, Dependent,
ContainsUnexpandedParameterPack);
}
const TypeConstraint *
concepts::ExprRequirement::ReturnTypeRequirement::getTypeConstraint() const {
assert(isTypeConstraint());
auto TPL = cast<TemplateParameterList *>(TypeConstraintInfo.getPointer());
return cast<TemplateTypeParmDecl>(TPL->getParam(0))
->getTypeConstraint();
}
// Search through the requirements, and see if any have a RecoveryExpr in it,
// which means this RequiresExpr ALSO needs to be invalid.
static bool RequirementContainsError(concepts::Requirement *R) {
if (auto *ExprReq = dyn_cast<concepts::ExprRequirement>(R))
return ExprReq->getExpr() && ExprReq->getExpr()->containsErrors();
if (auto *NestedReq = dyn_cast<concepts::NestedRequirement>(R))
return !NestedReq->hasInvalidConstraint() &&
NestedReq->getConstraintExpr() &&
NestedReq->getConstraintExpr()->containsErrors();
return false;
}
RequiresExpr::RequiresExpr(ASTContext &C, SourceLocation RequiresKWLoc,
RequiresExprBodyDecl *Body, SourceLocation LParenLoc,
ArrayRef<ParmVarDecl *> LocalParameters,
SourceLocation RParenLoc,
ArrayRef<concepts::Requirement *> Requirements,
SourceLocation RBraceLoc)
: Expr(RequiresExprClass, C.BoolTy, VK_PRValue, OK_Ordinary),
NumLocalParameters(LocalParameters.size()),
NumRequirements(Requirements.size()), Body(Body), LParenLoc(LParenLoc),
RParenLoc(RParenLoc), 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;
}
if (RequirementContainsError(R))
setDependence(getDependence() | ExprDependence::Error);
}
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,
SourceLocation LParenLoc, ArrayRef<ParmVarDecl *> LocalParameters,
SourceLocation RParenLoc, 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, LParenLoc, LocalParameters,
RParenLoc, 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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