blob: 61cbf3854bb211863a20fe8607b0b06d3804f35a [file] [log] [blame]
//== CheckerContext.cpp - Context info for path-sensitive checkers-----------=//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file defines CheckerContext that provides contextual info for
// path-sensitive checkers.
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
#include "clang/Basic/Builtins.h"
#include "clang/Lex/Lexer.h"
using namespace clang;
using namespace ento;
const FunctionDecl *CheckerContext::getCalleeDecl(const CallExpr *CE) const {
ProgramStateRef State = getState();
const Expr *Callee = CE->getCallee();
SVal L = State->getSVal(Callee, Pred->getLocationContext());
return L.getAsFunctionDecl();
StringRef CheckerContext::getCalleeName(const FunctionDecl *FunDecl) const {
if (!FunDecl)
return StringRef();
IdentifierInfo *funI = FunDecl->getIdentifier();
if (!funI)
return StringRef();
return funI->getName();
StringRef CheckerContext::getDeclDescription(const Decl *D) {
if (isa<ObjCMethodDecl>(D) || isa<CXXMethodDecl>(D))
return "method";
if (isa<BlockDecl>(D))
return "anonymous block";
return "function";
bool CheckerContext::isCLibraryFunction(const FunctionDecl *FD,
StringRef Name) {
// To avoid false positives (Ex: finding user defined functions with
// similar names), only perform fuzzy name matching when it's a builtin.
// Using a string compare is slow, we might want to switch on BuiltinID here.
unsigned BId = FD->getBuiltinID();
if (BId != 0) {
if (Name.empty())
return true;
StringRef BName = FD->getASTContext().BuiltinInfo.getName(BId);
if (BName.find(Name) != StringRef::npos)
return true;
const IdentifierInfo *II = FD->getIdentifier();
// If this is a special C++ name without IdentifierInfo, it can't be a
// C library function.
if (!II)
return false;
// Look through 'extern "C"' and anything similar invented in the future.
// If this function is not in TU directly, it is not a C library function.
if (!FD->getDeclContext()->getRedeclContext()->isTranslationUnit())
return false;
// If this function is not externally visible, it is not a C library function.
// Note that we make an exception for inline functions, which may be
// declared in header files without external linkage.
if (!FD->isInlined() && !FD->isExternallyVisible())
return false;
if (Name.empty())
return true;
StringRef FName = II->getName();
if (FName.equals(Name))
return true;
if (FName.startswith("__inline") && (FName.find(Name) != StringRef::npos))
return true;
if (FName.startswith("__") && FName.endswith("_chk") &&
FName.find(Name) != StringRef::npos)
return true;
return false;
StringRef CheckerContext::getMacroNameOrSpelling(SourceLocation &Loc) {
if (Loc.isMacroID())
return Lexer::getImmediateMacroName(Loc, getSourceManager(),
SmallVector<char, 16> buf;
return Lexer::getSpelling(Loc, buf, getSourceManager(), getLangOpts());
/// Evaluate comparison and return true if it's known that condition is true
static bool evalComparison(SVal LHSVal, BinaryOperatorKind ComparisonOp,
SVal RHSVal, ProgramStateRef State) {
if (LHSVal.isUnknownOrUndef())
return false;
ProgramStateManager &Mgr = State->getStateManager();
if (!LHSVal.getAs<NonLoc>()) {
LHSVal = Mgr.getStoreManager().getBinding(State->getStore(),
if (LHSVal.isUnknownOrUndef() || !LHSVal.getAs<NonLoc>())
return false;
SValBuilder &Bldr = Mgr.getSValBuilder();
SVal Eval = Bldr.evalBinOp(State, ComparisonOp, LHSVal, RHSVal,
if (Eval.isUnknownOrUndef())
return false;
ProgramStateRef StTrue, StFalse;
std::tie(StTrue, StFalse) = State->assume(Eval.castAs<DefinedSVal>());
return StTrue && !StFalse;
bool CheckerContext::isGreaterOrEqual(const Expr *E, unsigned long long Val) {
DefinedSVal V = getSValBuilder().makeIntVal(Val, getASTContext().LongLongTy);
return evalComparison(getSVal(E), BO_GE, V, getState());
bool CheckerContext::isNegative(const Expr *E) {
DefinedSVal V = getSValBuilder().makeIntVal(0, false);
return evalComparison(getSVal(E), BO_LT, V, getState());