99 lines
3.2 KiB
C++
99 lines
3.2 KiB
C++
//== CheckerContext.cpp - Context info for path-sensitive checkers-----------=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines CheckerContext that provides contextual info for
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// path-sensitive checkers.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
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#include "clang/Basic/Builtins.h"
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#include "clang/Lex/Lexer.h"
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using namespace clang;
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using namespace ento;
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const FunctionDecl *CheckerContext::getCalleeDecl(const CallExpr *CE) const {
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ProgramStateRef State = getState();
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const Expr *Callee = CE->getCallee();
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SVal L = State->getSVal(Callee, Pred->getLocationContext());
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return L.getAsFunctionDecl();
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}
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StringRef CheckerContext::getCalleeName(const FunctionDecl *FunDecl) const {
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if (!FunDecl)
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return StringRef();
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IdentifierInfo *funI = FunDecl->getIdentifier();
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if (!funI)
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return StringRef();
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return funI->getName();
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}
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bool CheckerContext::isCLibraryFunction(const FunctionDecl *FD,
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StringRef Name) {
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// To avoid false positives (Ex: finding user defined functions with
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// similar names), only perform fuzzy name matching when it's a builtin.
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// Using a string compare is slow, we might want to switch on BuiltinID here.
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unsigned BId = FD->getBuiltinID();
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if (BId != 0) {
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if (Name.empty())
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return true;
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StringRef BName = FD->getASTContext().BuiltinInfo.GetName(BId);
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if (BName.find(Name) != StringRef::npos)
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return true;
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}
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const IdentifierInfo *II = FD->getIdentifier();
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// If this is a special C++ name without IdentifierInfo, it can't be a
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// C library function.
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if (!II)
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return false;
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// Look through 'extern "C"' and anything similar invented in the future.
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const DeclContext *DC = FD->getDeclContext();
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while (DC->isTransparentContext())
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DC = DC->getParent();
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// If this function is in a namespace, it is not a C library function.
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if (!DC->isTranslationUnit())
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return false;
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// If this function is not externally visible, it is not a C library function.
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// Note that we make an exception for inline functions, which may be
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// declared in header files without external linkage.
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if (!FD->isInlined() && FD->getLinkage() != ExternalLinkage)
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return false;
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if (Name.empty())
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return true;
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StringRef FName = II->getName();
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if (FName.equals(Name))
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return true;
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if (FName.startswith("__inline") && (FName.find(Name) != StringRef::npos))
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return true;
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if (FName.startswith("__") && FName.endswith("_chk") &&
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FName.find(Name) != StringRef::npos)
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return true;
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return false;
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}
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StringRef CheckerContext::getMacroNameOrSpelling(SourceLocation &Loc) {
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if (Loc.isMacroID())
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return Lexer::getImmediateMacroName(Loc, getSourceManager(),
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getLangOpts());
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SmallVector<char, 16> buf;
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return Lexer::getSpelling(Loc, buf, getSourceManager(), getLangOpts());
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}
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