1 //== CheckerContext.cpp - Context info for path-sensitive checkers-----------=//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 //  This file defines CheckerContext that provides contextual info for
11 //  path-sensitive checkers.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
16 #include "clang/Basic/Builtins.h"
17 #include "clang/Lex/Lexer.h"
18 
19 using namespace clang;
20 using namespace ento;
21 
22 const FunctionDecl *CheckerContext::getCalleeDecl(const CallExpr *CE) const {
23   const ProgramState *State = getState();
24   const Expr *Callee = CE->getCallee();
25   SVal L = State->getSVal(Callee, Pred->getLocationContext());
26   return L.getAsFunctionDecl();
27 }
28 
29 StringRef CheckerContext::getCalleeName(const FunctionDecl *FunDecl) const {
30   if (!FunDecl)
31     return StringRef();
32   IdentifierInfo *funI = FunDecl->getIdentifier();
33   if (!funI)
34     return StringRef();
35   return funI->getName();
36 }
37 
38 
39 bool CheckerContext::isCLibraryFunction(const FunctionDecl *FD,
40                                         StringRef Name){
41   // To avoid false positives (Ex: finding user defined functions with
42   // similar names), only perform fuzzy name matching when it's a builtin.
43   // Using a string compare is slow, we might want to switch on BuiltinID here.
44   unsigned BId = FD->getBuiltinID();
45   if (BId != 0) {
46     ASTContext &Context = getASTContext();
47     StringRef BName = Context.BuiltinInfo.GetName(BId);
48     if (StringRef(BName).find(Name) != StringRef::npos)
49       return true;
50   }
51 
52   if (FD->isExternC() && FD->getIdentifier()->getName().equals(Name))
53     return true;
54 
55   return false;
56 }
57 
58 StringRef CheckerContext::getMacroNameOrSpelling(SourceLocation &Loc) {
59   if (Loc.isMacroID())
60     return Lexer::getImmediateMacroName(Loc, getSourceManager(),
61                                              getLangOptions());
62   SmallVector<char, 16> buf;
63   return Lexer::getSpelling(Loc, buf, getSourceManager(), getLangOptions());
64 }
65 
66