clang  3.8.0
CheckerContext.cpp
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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 
16 #include "clang/Basic/Builtins.h"
17 #include "clang/Lex/Lexer.h"
18 
19 using namespace clang;
20 using namespace ento;
21 
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 
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  if (Name.empty())
47  return true;
48  StringRef BName = FD->getASTContext().BuiltinInfo.getName(BId);
49  if (BName.find(Name) != StringRef::npos)
50  return true;
51  }
52 
53  const IdentifierInfo *II = FD->getIdentifier();
54  // If this is a special C++ name without IdentifierInfo, it can't be a
55  // C library function.
56  if (!II)
57  return false;
58 
59  // Look through 'extern "C"' and anything similar invented in the future.
60  // If this function is not in TU directly, it is not a C library function.
62  return false;
63 
64  // If this function is not externally visible, it is not a C library function.
65  // Note that we make an exception for inline functions, which may be
66  // declared in header files without external linkage.
67  if (!FD->isInlined() && !FD->isExternallyVisible())
68  return false;
69 
70  if (Name.empty())
71  return true;
72 
73  StringRef FName = II->getName();
74  if (FName.equals(Name))
75  return true;
76 
77  if (FName.startswith("__inline") && (FName.find(Name) != StringRef::npos))
78  return true;
79 
80  if (FName.startswith("__") && FName.endswith("_chk") &&
81  FName.find(Name) != StringRef::npos)
82  return true;
83 
84  return false;
85 }
86 
88  if (Loc.isMacroID())
90  getLangOpts());
92  return Lexer::getSpelling(Loc, buf, getSourceManager(), getLangOpts());
93 }
94 
static unsigned getSpelling(const Token &Tok, const char *&Buffer, const SourceManager &SourceMgr, const LangOptions &LangOpts, bool *Invalid=nullptr)
getSpelling - This method is used to get the spelling of a token into a preallocated buffer...
Definition: Lexer.cpp:358
FunctionDecl - An instance of this class is created to represent a function declaration or definition...
Definition: Decl.h:1483
StringRef getCalleeName(const FunctionDecl *FunDecl) const
Get the name of the called function (path-sensitive).
bool isMacroID() const
IdentifierInfo * getIdentifier() const
getIdentifier - Get the identifier that names this declaration, if there is one.
Definition: Decl.h:164
const Expr * getCallee() const
Definition: Expr.h:2170
One of these records is kept for each identifier that is lexed.
class LLVM_ALIGNAS(8) DependentTemplateSpecializationType const IdentifierInfo * Name
Represents a template specialization type whose template cannot be resolved, e.g. ...
Definition: Type.h:4381
const FunctionDecl * getCalleeDecl(const CallExpr *CE) const
Get the declaration of the called function (path-sensitive).
LineState State
bool isTranslationUnit() const
Definition: DeclBase.h:1269
const FunctionDecl * getAsFunctionDecl() const
getAsFunctionDecl - If this SVal is a MemRegionVal and wraps a CodeTextRegion wrapping a FunctionDecl...
Definition: SVals.cpp:51
const LocationContext * getLocationContext() const
Expr - This represents one expression.
Definition: Expr.h:104
StringRef getName() const
Return the actual identifier string.
const char * getName(unsigned ID) const
Return the identifier name for the specified builtin, e.g.
Definition: Builtins.h:82
const ProgramStateRef & getState() const
static bool isCLibraryFunction(const FunctionDecl *FD, StringRef Name=StringRef())
Returns true if the callee is an externally-visible function in the top-level namespace, such as malloc.
DeclContext * getDeclContext()
Definition: DeclBase.h:393
bool isInlined() const
Determine whether this function should be inlined, because it is either marked "inline" or "constexpr...
Definition: Decl.h:1999
bool isExternallyVisible() const
Definition: Decl.h:280
Encodes a location in the source.
ASTContext & getASTContext() const LLVM_READONLY
Definition: DeclBase.cpp:311
SVal - This represents a symbolic expression, which can be either an L-value or an R-value...
Definition: SVals.h:44
unsigned getBuiltinID() const
Returns a value indicating whether this function corresponds to a builtin function.
Definition: Decl.cpp:2693
static StringRef getImmediateMacroName(SourceLocation Loc, const SourceManager &SM, const LangOptions &LangOpts)
Retrieve the name of the immediate macro expansion.
Definition: Lexer.cpp:956
StringRef getMacroNameOrSpelling(SourceLocation &Loc)
Depending on wither the location corresponds to a macro, return either the macro name or the token sp...
const LangOptions & getLangOpts() const
DeclContext * getRedeclContext()
getRedeclContext - Retrieve the context in which an entity conflicts with other entities of the same ...
Definition: DeclBase.cpp:1495
SourceManager & getSourceManager()
Builtin::Context & BuiltinInfo
Definition: ASTContext.h:453
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2134
Defines enum values for all the target-independent builtin functions.