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73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
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//=- CheckNSError.cpp - Coding conventions for uses of NSError ---*- C++ -*-==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines a CheckNSError, a flow-insenstive check
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// that determines if an Objective-C class interface correctly returns
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// a non-void return type.
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//
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// File under feature request PR 2600.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Analysis/LocalCheckers.h"
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#include "clang/Analysis/PathSensitive/BugReporter.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/Type.h"
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#include "clang/AST/ASTContext.h"
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using namespace clang;
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void clang::CheckNSError(ObjCImplementationDecl* ID, BugReporter& BR) {
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// Look at the @interface for this class.
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ObjCInterfaceDecl* D = ID->getClassInterface();
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// Get the ASTContext. Useful for querying type information.
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ASTContext &Ctx = BR.getContext();
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// Get the IdentifierInfo* for "NSError".
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IdentifierInfo* NSErrorII = &Ctx.Idents.get("NSError");
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// Scan the methods. See if any of them have an argument of type NSError**.
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for (ObjCInterfaceDecl::instmeth_iterator I=D->instmeth_begin(),
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E=D->instmeth_end(); I!=E; ++I) {
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// Get the method declaration.
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ObjCMethodDecl* M = *I;
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// Check for a non-void return type.
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if (M->getResultType() != Ctx.VoidTy)
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continue;
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for (ObjCMethodDecl::param_iterator PI=M->param_begin(),
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PE=M->param_end(); PI!=PE; ++PI) {
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const PointerType* PPT = (*PI)->getType()->getAsPointerType();
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if (!PPT) continue;
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const PointerType* PT = PPT->getPointeeType()->getAsPointerType();
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if (!PT) continue;
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const ObjCInterfaceType *IT =
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PT->getPointeeType()->getAsObjCInterfaceType();
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if (!IT) continue;
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// Check if IT is "NSError".
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if (IT->getDecl()->getIdentifier() == NSErrorII) {
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// Documentation: "Creating and Returning NSError Objects"
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BR.EmitBasicReport("Bad return type when passing NSError**",
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"Method accepting NSError** argument should have "
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"non-void return value to indicate that an error occurred.",
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M->getLocStart());
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break;
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}
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}
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}
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}
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