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//===--- ExceptionEscapeCheck.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 "ExceptionEscapeCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringSet.h"
using namespace clang::ast_matchers;
namespace clang::tidy::bugprone {
namespace {
AST_MATCHER_P(FunctionDecl, isEnabled, llvm::StringSet<>,
FunctionsThatShouldNotThrow) {
return FunctionsThatShouldNotThrow.count(Node.getNameAsString()) > 0;
}
AST_MATCHER(FunctionDecl, isExplicitThrow) {
return isExplicitThrowExceptionSpec(Node.getExceptionSpecType()) &&
Node.getExceptionSpecSourceRange().isValid();
}
} // namespace
ExceptionEscapeCheck::ExceptionEscapeCheck(StringRef Name,
ClangTidyContext *Context)
: ClangTidyCheck(Name, Context), RawFunctionsThatShouldNotThrow(Options.get(
"FunctionsThatShouldNotThrow", "")),
RawIgnoredExceptions(Options.get("IgnoredExceptions", "")) {
llvm::SmallVector<StringRef, 8> FunctionsThatShouldNotThrowVec,
IgnoredExceptionsVec;
StringRef(RawFunctionsThatShouldNotThrow)
.split(FunctionsThatShouldNotThrowVec, ",", -1, false);
FunctionsThatShouldNotThrow.insert(FunctionsThatShouldNotThrowVec.begin(),
FunctionsThatShouldNotThrowVec.end());
llvm::StringSet<> IgnoredExceptions;
StringRef(RawIgnoredExceptions).split(IgnoredExceptionsVec, ",", -1, false);
IgnoredExceptions.insert(IgnoredExceptionsVec.begin(),
IgnoredExceptionsVec.end());
Tracer.ignoreExceptions(std::move(IgnoredExceptions));
Tracer.ignoreBadAlloc(true);
}
void ExceptionEscapeCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "FunctionsThatShouldNotThrow",
RawFunctionsThatShouldNotThrow);
Options.store(Opts, "IgnoredExceptions", RawIgnoredExceptions);
}
void ExceptionEscapeCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
functionDecl(isDefinition(),
anyOf(isNoThrow(),
allOf(anyOf(cxxDestructorDecl(),
cxxConstructorDecl(isMoveConstructor()),
cxxMethodDecl(isMoveAssignmentOperator()),
isMain(), hasName("swap")),
unless(isExplicitThrow())),
isEnabled(FunctionsThatShouldNotThrow)))
.bind("thrower"),
this);
}
void ExceptionEscapeCheck::check(const MatchFinder::MatchResult &Result) {
const auto *MatchedDecl = Result.Nodes.getNodeAs<FunctionDecl>("thrower");
if (!MatchedDecl)
return;
if (Tracer.analyze(MatchedDecl).getBehaviour() ==
utils::ExceptionAnalyzer::State::Throwing)
// FIXME: We should provide more information about the exact location where
// the exception is thrown, maybe the full path the exception escapes
diag(MatchedDecl->getLocation(), "an exception may be thrown in function "
"%0 which should not throw exceptions")
<< MatchedDecl;
}
} // namespace clang::tidy::bugprone
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