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//=== NoReturnFunctionChecker.cpp -------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This defines NoReturnFunctionChecker, which evaluates functions that do not
// return to the caller.
//
//===----------------------------------------------------------------------===//
#include "GRExprEngineInternalChecks.h"
#include "clang/Analysis/PathSensitive/Checker.h"
#include "llvm/ADT/StringSwitch.h"
using namespace clang;
namespace {
class NoReturnFunctionChecker : public Checker {
public:
static void *getTag() { static int tag = 0; return &tag; }
virtual bool EvalCallExpr(CheckerContext &C, const CallExpr *CE);
};
}
void clang::RegisterNoReturnFunctionChecker(GRExprEngine &Eng) {
Eng.registerCheck(new NoReturnFunctionChecker());
}
bool NoReturnFunctionChecker::EvalCallExpr(CheckerContext &C,
const CallExpr *CE) {
const GRState *state = C.getState();
const Expr *Callee = CE->getCallee();
SVal L = state->getSVal(Callee);
const FunctionDecl *FD = L.getAsFunctionDecl();
if (!FD)
return false;
bool BuildSinks = false;
if (FD->getAttr<NoReturnAttr>() || FD->getAttr<AnalyzerNoReturnAttr>())
BuildSinks = true;
else if (const IdentifierInfo *II = FD->getIdentifier()) {
// HACK: Some functions are not marked noreturn, and don't return.
// Here are a few hardwired ones. If this takes too long, we can
// potentially cache these results.
BuildSinks
= llvm::StringSwitch<bool>(llvm::StringRef(II->getName()))
.Case("exit", true)
.Case("panic", true)
.Case("error", true)
.Case("Assert", true)
// FIXME: This is just a wrapper around throwing an exception.
// Eventually inter-procedural analysis should handle this easily.
.Case("ziperr", true)
.Case("assfail", true)
.Case("db_error", true)
.Case("__assert", true)
.Case("__assert_rtn", true)
.Case("__assert_fail", true)
.Case("dtrace_assfail", true)
.Case("yy_fatal_error", true)
.Case("_XCAssertionFailureHandler", true)
.Case("_DTAssertionFailureHandler", true)
.Case("_TSAssertionFailureHandler", true)
.Default(false);
}
if (!BuildSinks)
return false;
C.GenerateSink(CE);
return true;
}
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