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//===--- MustCheckErrsCheck.cpp - clang-tidy ------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "MustCheckErrsCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang::tidy::linuxkernel {
void MustCheckErrsCheck::registerMatchers(MatchFinder *Finder) {
auto ErrFn =
functionDecl(hasAnyName("ERR_PTR", "PTR_ERR", "IS_ERR", "IS_ERR_OR_NULL",
"ERR_CAST", "PTR_ERR_OR_ZERO"));
auto NonCheckingStmts = stmt(anyOf(compoundStmt(), labelStmt()));
Finder->addMatcher(
callExpr(callee(ErrFn), hasParent(NonCheckingStmts)).bind("call"),
this);
auto ReturnToCheck = returnStmt(hasReturnValue(callExpr(callee(ErrFn))));
auto ReturnsErrFn = functionDecl(hasDescendant(ReturnToCheck));
Finder->addMatcher(callExpr(callee(ReturnsErrFn), hasParent(NonCheckingStmts))
.bind("transitive_call"),
this);
}
void MustCheckErrsCheck::check(const MatchFinder::MatchResult &Result) {
const CallExpr *MatchedCallExpr = Result.Nodes.getNodeAs<CallExpr>("call");
if (MatchedCallExpr) {
diag(MatchedCallExpr->getExprLoc(), "result from function %0 is unused")
<< MatchedCallExpr->getDirectCallee();
}
const CallExpr *MatchedTransitiveCallExpr =
Result.Nodes.getNodeAs<CallExpr>("transitive_call");
if (MatchedTransitiveCallExpr) {
diag(MatchedTransitiveCallExpr->getExprLoc(),
"result from function %0 is unused but represents an error value")
<< MatchedTransitiveCallExpr->getDirectCallee();
}
}
} // namespace clang::tidy::linuxkernel
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