clang  6.0.0svn
ObjCNoReturn.cpp
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1 //= ObjCNoReturn.cpp - Handling of Cocoa APIs known not to return --*- C++ -*---
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 implements special handling of recognizing ObjC API hooks that
11 // do not return but aren't marked as such in API headers.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/ExprObjC.h"
18 
19 using namespace clang;
20 
21 static bool isSubclass(const ObjCInterfaceDecl *Class, IdentifierInfo *II) {
22  if (!Class)
23  return false;
24  if (Class->getIdentifier() == II)
25  return true;
26  return isSubclass(Class->getSuperClass(), II);
27 }
28 
30  : RaiseSel(GetNullarySelector("raise", C)),
31  NSExceptionII(&C.Idents.get("NSException"))
32 {
33  // Generate selectors.
35 
36  // raise:format:
37  II.push_back(&C.Idents.get("raise"));
38  II.push_back(&C.Idents.get("format"));
39  NSExceptionInstanceRaiseSelectors[0] =
40  C.Selectors.getSelector(II.size(), &II[0]);
41 
42  // raise:format:arguments:
43  II.push_back(&C.Idents.get("arguments"));
44  NSExceptionInstanceRaiseSelectors[1] =
45  C.Selectors.getSelector(II.size(), &II[0]);
46 }
47 
48 
50  Selector S = ME->getSelector();
51 
52  if (ME->isInstanceMessage()) {
53  // Check for the "raise" message.
54  return S == RaiseSel;
55  }
56 
57  if (const ObjCInterfaceDecl *ID = ME->getReceiverInterface()) {
58  if (isSubclass(ID, NSExceptionII)) {
59  for (unsigned i = 0; i < NUM_RAISE_SELECTORS; ++i) {
60  if (S == NSExceptionInstanceRaiseSelectors[i])
61  return true;
62  }
63  }
64  }
65 
66  return false;
67 }
Defines the clang::ASTContext interface.
Smart pointer class that efficiently represents Objective-C method names.
Selector getSelector() const
Definition: ExprObjC.cpp:312
static bool isSubclass(const ObjCInterfaceDecl *Class, IdentifierInfo *II)
ObjCInterfaceDecl * getReceiverInterface() const
Retrieve the Objective-C interface to which this message is being directed, if known.
Definition: ExprObjC.cpp:333
IdentifierInfo * getIdentifier() const
getIdentifier - Get the identifier that names this declaration, if there is one.
Definition: Decl.h:265
One of these records is kept for each identifier that is lexed.
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:149
IdentifierTable & Idents
Definition: ASTContext.h:537
Selector GetNullarySelector(StringRef name, ASTContext &Ctx)
Utility function for constructing a nullary selector.
Definition: ASTContext.h:2845
Represents an ObjC class declaration.
Definition: DeclObjC.h:1191
ObjCInterfaceDecl * getSuperClass() const
Definition: DeclObjC.cpp:330
An expression that sends a message to the given Objective-C object or class.
Definition: ExprObjC.h:903
SelectorTable & Selectors
Definition: ASTContext.h:538
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
Dataflow Directional Tag Classes.
bool isImplicitNoReturn(const ObjCMessageExpr *ME)
Return true if the given message expression is known to never return.
ObjCNoReturn(ASTContext &C)
Selector getSelector(unsigned NumArgs, IdentifierInfo **IIV)
Can create any sort of selector.
bool isInstanceMessage() const
Determine whether this is an instance message to either a computed object or to super.
Definition: ExprObjC.h:1194