CheckerContext.cpp revision 998e2754281b19bb1db19299ae16c2fd5947bcc0 
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  ProgramStateRef 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  return isCLibraryFunction(FD, Name, getASTContext());
42}
43
44bool CheckerContext::isCLibraryFunction(const FunctionDecl *FD,
45                                        StringRef Name, ASTContext &Context) {
46  // To avoid false positives (Ex: finding user defined functions with
47  // similar names), only perform fuzzy name matching when it's a builtin.
48  // Using a string compare is slow, we might want to switch on BuiltinID here.
49  unsigned BId = FD->getBuiltinID();
50  if (BId != 0) {
51    StringRef BName = Context.BuiltinInfo.GetName(BId);
52    if (BName.find(Name) != StringRef::npos)
53      return true;
54  }
55
56  const IdentifierInfo *II = FD->getIdentifier();
57  // If this is a special C++ name without IdentifierInfo, it can't be a
58  // C library function.
59  if (!II)
60    return false;
61
62  StringRef FName = II->getName();
63  if (FName.equals(Name))
64    return true;
65
66  if (FName.startswith("__inline") && (FName.find(Name) != StringRef::npos))
67    return true;
68
69  if (FName.startswith("__") && FName.endswith("_chk") &&
70      FName.find(Name) != StringRef::npos)
71    return true;
72
73  return false;
74}
75
76StringRef CheckerContext::getMacroNameOrSpelling(SourceLocation &Loc) {
77  if (Loc.isMacroID())
78    return Lexer::getImmediateMacroName(Loc, getSourceManager(),
79                                             getLangOptions());
80  SmallVector<char, 16> buf;
81  return Lexer::getSpelling(Loc, buf, getSourceManager(), getLangOptions());
82}
83
84