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//===--- IgnoreExpr.h - Ignore intermediate Expressions -----------------===//
//
// 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 defines common functions to ignore intermediate expression nodes
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_IGNOREEXPR_H
#define LLVM_CLANG_AST_IGNOREEXPR_H
#include "clang/AST/Expr.h"
#include "clang/AST/ExprCXX.h"
namespace clang {
namespace detail {
/// Given an expression E and functions Fn_1,...,Fn_n : Expr * -> Expr *,
/// Return Fn_n(...(Fn_1(E)))
inline Expr *IgnoreExprNodesImpl(Expr *E) { return E; }
template <typename FnTy, typename... FnTys>
Expr *IgnoreExprNodesImpl(Expr *E, FnTy &&Fn, FnTys &&... Fns) {
return IgnoreExprNodesImpl(Fn(E), std::forward<FnTys>(Fns)...);
}
} // namespace detail
/// Given an expression E and functions Fn_1,...,Fn_n : Expr * -> Expr *,
/// Recursively apply each of the functions to E until reaching a fixed point.
/// Note that a null E is valid; in this case nothing is done.
template <typename... FnTys> Expr *IgnoreExprNodes(Expr *E, FnTys &&... Fns) {
Expr *LastE = nullptr;
while (E != LastE) {
LastE = E;
E = detail::IgnoreExprNodesImpl(E, std::forward<FnTys>(Fns)...);
}
return E;
}
template <typename... FnTys>
const Expr *IgnoreExprNodes(const Expr *E, FnTys &&...Fns) {
return IgnoreExprNodes(const_cast<Expr *>(E), std::forward<FnTys>(Fns)...);
}
inline Expr *IgnoreImplicitCastsSingleStep(Expr *E) {
if (auto *ICE = dyn_cast<ImplicitCastExpr>(E))
return ICE->getSubExpr();
if (auto *FE = dyn_cast<FullExpr>(E))
return FE->getSubExpr();
return E;
}
inline Expr *IgnoreImplicitCastsExtraSingleStep(Expr *E) {
// FIXME: Skip MaterializeTemporaryExpr and SubstNonTypeTemplateParmExpr in
// addition to what IgnoreImpCasts() skips to account for the current
// behaviour of IgnoreParenImpCasts().
Expr *SubE = IgnoreImplicitCastsSingleStep(E);
if (SubE != E)
return SubE;
if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E))
return MTE->getSubExpr();
if (auto *NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(E))
return NTTP->getReplacement();
return E;
}
inline Expr *IgnoreCastsSingleStep(Expr *E) {
if (auto *CE = dyn_cast<CastExpr>(E))
return CE->getSubExpr();
if (auto *FE = dyn_cast<FullExpr>(E))
return FE->getSubExpr();
if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E))
return MTE->getSubExpr();
if (auto *NTTP = dyn_cast<SubstNonTypeTemplateParmExpr>(E))
return NTTP->getReplacement();
return E;
}
inline Expr *IgnoreLValueCastsSingleStep(Expr *E) {
// Skip what IgnoreCastsSingleStep skips, except that only
// lvalue-to-rvalue casts are skipped.
if (auto *CE = dyn_cast<CastExpr>(E))
if (CE->getCastKind() != CK_LValueToRValue)
return E;
return IgnoreCastsSingleStep(E);
}
inline Expr *IgnoreBaseCastsSingleStep(Expr *E) {
if (auto *CE = dyn_cast<CastExpr>(E))
if (CE->getCastKind() == CK_DerivedToBase ||
CE->getCastKind() == CK_UncheckedDerivedToBase ||
CE->getCastKind() == CK_NoOp)
return CE->getSubExpr();
return E;
}
inline Expr *IgnoreImplicitSingleStep(Expr *E) {
Expr *SubE = IgnoreImplicitCastsSingleStep(E);
if (SubE != E)
return SubE;
if (auto *MTE = dyn_cast<MaterializeTemporaryExpr>(E))
return MTE->getSubExpr();
if (auto *BTE = dyn_cast<CXXBindTemporaryExpr>(E))
return BTE->getSubExpr();
return E;
}
inline Expr *IgnoreElidableImplicitConstructorSingleStep(Expr *E) {
auto *CCE = dyn_cast<CXXConstructExpr>(E);
if (CCE && CCE->isElidable() && !isa<CXXTemporaryObjectExpr>(CCE)) {
unsigned NumArgs = CCE->getNumArgs();
if ((NumArgs == 1 ||
(NumArgs > 1 && CCE->getArg(1)->isDefaultArgument())) &&
!CCE->getArg(0)->isDefaultArgument() && !CCE->isListInitialization())
return CCE->getArg(0);
}
return E;
}
inline Expr *IgnoreImplicitAsWrittenSingleStep(Expr *E) {
if (auto *ICE = dyn_cast<ImplicitCastExpr>(E))
return ICE->getSubExprAsWritten();
return IgnoreImplicitSingleStep(E);
}
inline Expr *IgnoreParensOnlySingleStep(Expr *E) {
if (auto *PE = dyn_cast<ParenExpr>(E))
return PE->getSubExpr();
return E;
}
inline Expr *IgnoreParensSingleStep(Expr *E) {
if (auto *PE = dyn_cast<ParenExpr>(E))
return PE->getSubExpr();
if (auto *UO = dyn_cast<UnaryOperator>(E)) {
if (UO->getOpcode() == UO_Extension)
return UO->getSubExpr();
}
else if (auto *GSE = dyn_cast<GenericSelectionExpr>(E)) {
if (!GSE->isResultDependent())
return GSE->getResultExpr();
}
else if (auto *CE = dyn_cast<ChooseExpr>(E)) {
if (!CE->isConditionDependent())
return CE->getChosenSubExpr();
}
return E;
}
} // namespace clang
#endif // LLVM_CLANG_AST_IGNOREEXPR_H
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