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//== 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();
}
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.
const DeclContext *DC = FD->getDeclContext();
while (DC->isTransparentContext())
DC = DC->getParent();
// If this function is in a namespace, it is not a C library function.
if (!DC->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(),
getLangOpts());
SmallVector<char, 16> buf;
return Lexer::getSpelling(Loc, buf, getSourceManager(), getLangOpts());
}
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