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
getCalleeDecl(const CallExpr * CE) const22 const 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
getCalleeName(const FunctionDecl * FunDecl) const29 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
isCLibraryFunction(const FunctionDecl * FD,StringRef Name)39 bool CheckerContext::isCLibraryFunction(const FunctionDecl *FD,
40 StringRef Name) {
41 return isCLibraryFunction(FD, Name, getASTContext());
42 }
43
isCLibraryFunction(const FunctionDecl * FD,StringRef Name,ASTContext & Context)44 bool 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
getMacroNameOrSpelling(SourceLocation & Loc)76 StringRef CheckerContext::getMacroNameOrSpelling(SourceLocation &Loc) {
77 if (Loc.isMacroID())
78 return Lexer::getImmediateMacroName(Loc, getSourceManager(),
79 getLangOpts());
80 SmallVector<char, 16> buf;
81 return Lexer::getSpelling(Loc, buf, getSourceManager(), getLangOpts());
82 }
83
84