66 lines
1.8 KiB
C++
66 lines
1.8 KiB
C++
//===------------- Aliasing.cpp - clang-tidy ------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "Aliasing.h"
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#include "clang/AST/Expr.h"
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namespace clang {
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namespace tidy {
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namespace utils {
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/// Return whether \p S is a reference to the declaration of \p Var.
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static bool isAccessForVar(const Stmt *S, const VarDecl *Var) {
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if (const auto *DRE = dyn_cast<DeclRefExpr>(S))
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return DRE->getDecl() == Var;
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return false;
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}
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/// Return whether \p Var has a pointer or reference in \p S.
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static bool isPtrOrReferenceForVar(const Stmt *S, const VarDecl *Var) {
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if (const auto *DS = dyn_cast<DeclStmt>(S)) {
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for (const Decl *D : DS->getDeclGroup()) {
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if (const auto *LeftVar = dyn_cast<VarDecl>(D)) {
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if (LeftVar->hasInit() && LeftVar->getType()->isReferenceType()) {
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return isAccessForVar(LeftVar->getInit(), Var);
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}
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}
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}
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} else if (const auto *UnOp = dyn_cast<UnaryOperator>(S)) {
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if (UnOp->getOpcode() == UO_AddrOf)
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return isAccessForVar(UnOp->getSubExpr(), Var);
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}
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return false;
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}
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/// Return whether \p Var has a pointer or reference in \p S.
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static bool hasPtrOrReferenceInStmt(const Stmt *S, const VarDecl *Var) {
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if (isPtrOrReferenceForVar(S, Var))
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return true;
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for (const Stmt *Child : S->children()) {
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if (!Child)
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continue;
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if (hasPtrOrReferenceInStmt(Child, Var))
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return true;
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}
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return false;
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}
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bool hasPtrOrReferenceInFunc(const FunctionDecl *Func, const VarDecl *Var) {
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return hasPtrOrReferenceInStmt(Func->getBody(), Var);
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}
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} // namespace utils
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} // namespace tidy
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} // namespace clang
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