clang-tools  11.0.0
Aliasing.cpp
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1 //===------------- Aliasing.cpp - clang-tidy ------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "Aliasing.h"
10 
11 #include "clang/AST/Expr.h"
12 
13 namespace clang {
14 namespace tidy {
15 namespace utils {
16 
17 /// Return whether \p S is a reference to the declaration of \p Var.
18 static bool isAccessForVar(const Stmt *S, const VarDecl *Var) {
19  if (const auto *DRE = dyn_cast<DeclRefExpr>(S))
20  return DRE->getDecl() == Var;
21 
22  return false;
23 }
24 
25 /// Return whether \p Var has a pointer or reference in \p S.
26 static bool isPtrOrReferenceForVar(const Stmt *S, const VarDecl *Var) {
27  if (const auto *DS = dyn_cast<DeclStmt>(S)) {
28  for (const Decl *D : DS->getDeclGroup()) {
29  if (const auto *LeftVar = dyn_cast<VarDecl>(D)) {
30  if (LeftVar->hasInit() && LeftVar->getType()->isReferenceType()) {
31  return isAccessForVar(LeftVar->getInit(), Var);
32  }
33  }
34  }
35  } else if (const auto *UnOp = dyn_cast<UnaryOperator>(S)) {
36  if (UnOp->getOpcode() == UO_AddrOf)
37  return isAccessForVar(UnOp->getSubExpr(), Var);
38  }
39 
40  return false;
41 }
42 
43 /// Return whether \p Var has a pointer or reference in \p S.
44 static bool hasPtrOrReferenceInStmt(const Stmt *S, const VarDecl *Var) {
45  if (isPtrOrReferenceForVar(S, Var))
46  return true;
47 
48  for (const Stmt *Child : S->children()) {
49  if (!Child)
50  continue;
51 
52  if (hasPtrOrReferenceInStmt(Child, Var))
53  return true;
54  }
55 
56  return false;
57 }
58 
59 bool hasPtrOrReferenceInFunc(const FunctionDecl *Func, const VarDecl *Var) {
60  return hasPtrOrReferenceInStmt(Func->getBody(), Var);
61 }
62 
63 } // namespace utils
64 } // namespace tidy
65 } // namespace clang
clang::tidy::utils::isPtrOrReferenceForVar
static bool isPtrOrReferenceForVar(const Stmt *S, const VarDecl *Var)
Return whether Var has a pointer or reference in S.
Definition: Aliasing.cpp:26
Decl
const FunctionDecl * Decl
Definition: AvoidBindCheck.cpp:100
clang::tidy::utils::isAccessForVar
static bool isAccessForVar(const Stmt *S, const VarDecl *Var)
Return whether S is a reference to the declaration of Var.
Definition: Aliasing.cpp:18
Aliasing.h
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27
clang::tidy::utils::hasPtrOrReferenceInStmt
static bool hasPtrOrReferenceInStmt(const Stmt *S, const VarDecl *Var)
Return whether Var has a pointer or reference in S.
Definition: Aliasing.cpp:44
clang::tidy::utils::hasPtrOrReferenceInFunc
bool hasPtrOrReferenceInFunc(const FunctionDecl *Func, const VarDecl *Var)
Returns whether Var has a pointer or reference in Func.
Definition: Aliasing.cpp:59