clang  10.0.0svn
ObjCNoReturn.cpp
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1 //= ObjCNoReturn.cpp - Handling of Cocoa APIs known not to return --*- C++ -*---
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements special handling of recognizing ObjC API hooks that
10 // do not return but aren't marked as such in API headers.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/ExprObjC.h"
17 
18 using namespace clang;
19 
20 static bool isSubclass(const ObjCInterfaceDecl *Class, IdentifierInfo *II) {
21  if (!Class)
22  return false;
23  if (Class->getIdentifier() == II)
24  return true;
25  return isSubclass(Class->getSuperClass(), II);
26 }
27 
29  : RaiseSel(GetNullarySelector("raise", C)),
30  NSExceptionII(&C.Idents.get("NSException"))
31 {
32  // Generate selectors.
34 
35  // raise:format:
36  II.push_back(&C.Idents.get("raise"));
37  II.push_back(&C.Idents.get("format"));
38  NSExceptionInstanceRaiseSelectors[0] =
39  C.Selectors.getSelector(II.size(), &II[0]);
40 
41  // raise:format:arguments:
42  II.push_back(&C.Idents.get("arguments"));
43  NSExceptionInstanceRaiseSelectors[1] =
44  C.Selectors.getSelector(II.size(), &II[0]);
45 }
46 
47 
49  Selector S = ME->getSelector();
50 
51  if (ME->isInstanceMessage()) {
52  // Check for the "raise" message.
53  return S == RaiseSel;
54  }
55 
56  if (const ObjCInterfaceDecl *ID = ME->getReceiverInterface()) {
57  if (isSubclass(ID, NSExceptionII)) {
58  for (unsigned i = 0; i < NUM_RAISE_SELECTORS; ++i) {
59  if (S == NSExceptionInstanceRaiseSelectors[i])
60  return true;
61  }
62  }
63  }
64 
65  return false;
66 }
Defines the clang::ASTContext interface.
Smart pointer class that efficiently represents Objective-C method names.
Selector getSelector() const
Definition: ExprObjC.cpp:337
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:358
IdentifierInfo * getIdentifier() const
Get the identifier that names this declaration, if there is one.
Definition: Decl.h:269
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:154
IdentifierTable & Idents
Definition: ASTContext.h:569
Selector GetNullarySelector(StringRef name, ASTContext &Ctx)
Utility function for constructing a nullary selector.
Definition: ASTContext.h:3020
Represents an ObjC class declaration.
Definition: DeclObjC.h:1171
ObjCInterfaceDecl * getSuperClass() const
Definition: DeclObjC.cpp:337
An expression that sends a message to the given Objective-C object or class.
Definition: ExprObjC.h:950
SelectorTable & Selectors
Definition: ASTContext.h:570
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:1248