CheckerContext.cpp revision 3026348bd4c13a0f83b59839f64065e0fcbea253 
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
19using namespace clang;
20using namespace ento;
21
22const 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
29StringRef 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
39bool 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
58StringRef 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