clang-tools  14.0.0git
MustCheckErrsCheck.cpp
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1 //===--- MustCheckErrsCheck.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 "MustCheckErrsCheck.h"
10 #include "clang/AST/ASTContext.h"
11 #include "clang/ASTMatchers/ASTMatchFinder.h"
12 
13 using namespace clang::ast_matchers;
14 
15 namespace clang {
16 namespace tidy {
17 namespace linuxkernel {
18 
19 void MustCheckErrsCheck::registerMatchers(MatchFinder *Finder) {
20  auto ErrFn =
21  functionDecl(hasAnyName("ERR_PTR", "PTR_ERR", "IS_ERR", "IS_ERR_OR_NULL",
22  "ERR_CAST", "PTR_ERR_OR_ZERO"));
23  auto NonCheckingStmts = stmt(anyOf(compoundStmt(), labelStmt()));
24  Finder->addMatcher(
25  callExpr(callee(ErrFn), hasParent(NonCheckingStmts)).bind("call"),
26  this);
27 
28  auto ReturnToCheck = returnStmt(hasReturnValue(callExpr(callee(ErrFn))));
29  auto ReturnsErrFn = functionDecl(hasDescendant(ReturnToCheck));
30  Finder->addMatcher(callExpr(callee(ReturnsErrFn), hasParent(NonCheckingStmts))
31  .bind("transitive_call"),
32  this);
33 }
34 
35 void MustCheckErrsCheck::check(const MatchFinder::MatchResult &Result) {
36  const CallExpr *MatchedCallExpr = Result.Nodes.getNodeAs<CallExpr>("call");
37  if (MatchedCallExpr) {
38  diag(MatchedCallExpr->getExprLoc(), "result from function %0 is unused")
39  << MatchedCallExpr->getDirectCallee();
40  }
41 
42  const CallExpr *MatchedTransitiveCallExpr =
43  Result.Nodes.getNodeAs<CallExpr>("transitive_call");
44  if (MatchedTransitiveCallExpr) {
45  diag(MatchedTransitiveCallExpr->getExprLoc(),
46  "result from function %0 is unused but represents an error value")
47  << MatchedTransitiveCallExpr->getDirectCallee();
48  }
49 }
50 
51 } // namespace linuxkernel
52 } // namespace tidy
53 } // namespace clang
clang::ast_matchers
Definition: AbseilMatcher.h:14
clang::clangd::check
bool check(llvm::StringRef File, llvm::function_ref< bool(const Position &)> ShouldCheckLine, const ThreadsafeFS &TFS, const ClangdLSPServer::Options &Opts, bool EnableCodeCompletion)
Definition: Check.cpp:258
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27
MustCheckErrsCheck.h