| //=== 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 "ExprEngineInternalChecks.h" |
| #include "clang/StaticAnalyzer/PathSensitive/CheckerVisitor.h" |
| #include "llvm/ADT/StringSwitch.h" |
| |
| using namespace clang; |
| using namespace ento; |
| |
| namespace { |
| |
| class NoReturnFunctionChecker : public CheckerVisitor<NoReturnFunctionChecker> { |
| public: |
| static void *getTag() { static int tag = 0; return &tag; } |
| void PostVisitCallExpr(CheckerContext &C, const CallExpr *CE); |
| }; |
| |
| } |
| |
| void ento::RegisterNoReturnFunctionChecker(ExprEngine &Eng) { |
| Eng.registerCheck(new NoReturnFunctionChecker()); |
| } |
| |
| void NoReturnFunctionChecker::PostVisitCallExpr(CheckerContext &C, |
| const CallExpr *CE) { |
| const GRState *state = C.getState(); |
| const Expr *Callee = CE->getCallee(); |
| |
| bool BuildSinks = getFunctionExtInfo(Callee->getType()).getNoReturn(); |
| |
| if (!BuildSinks) { |
| SVal L = state->getSVal(Callee); |
| const FunctionDecl *FD = L.getAsFunctionDecl(); |
| if (!FD) |
| return; |
| |
| if (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) |
| C.generateSink(CE); |
| } |