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//===----- CGObjCRuntime.h - Interface to ObjC Runtimes ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This provides an abstract class for Objective-C code generation. Concrete
// subclasses of this implement code generation for specific Objective-C
// runtime libraries.
//
//===----------------------------------------------------------------------===//
#ifndef CLANG_CODEGEN_OBCJRUNTIME_H
#define CLANG_CODEGEN_OBCJRUNTIME_H
#include "clang/Basic/IdentifierTable.h" // Selector
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/IRBuilder.h"
#include <string>
#include "CGValue.h"
namespace llvm {
class Constant;
class Type;
class Value;
class Module;
class Function;
}
namespace clang {
namespace CodeGen {
class CodeGenFunction;
}
class ObjCCategoryImplDecl;
class ObjCImplementationDecl;
class ObjCInterfaceDecl;
class ObjCMessageExpr;
class ObjCMethodDecl;
class ObjCProtocolDecl;
class Selector;
namespace CodeGen {
class CodeGenModule;
//FIXME Several methods should be pure virtual but aren't to avoid the
//partially-implemented subclass breaking.
/// Implements runtime-specific code generation functions.
class CGObjCRuntime {
typedef llvm::IRBuilder<> BuilderType;
public:
virtual ~CGObjCRuntime();
/// Generate the function required to register all Objective-C components in
/// this compilation unit with the runtime library.
virtual llvm::Function *ModuleInitFunction() = 0;
/// Get a selector for the specified name and type values. The
/// return value should have the LLVM type for pointer-to
/// ASTContext::getObjCSelType().
virtual llvm::Value *GetSelector(BuilderType &Builder,
Selector Sel) = 0;
/// Generate a constant string object.
virtual llvm::Constant *GenerateConstantString(const std::string &String) = 0;
/// Generate a category. A category contains a list of methods (and
/// accompanying metadata) and a list of protocols.
virtual void GenerateCategory(const ObjCCategoryImplDecl *OCD) = 0;
/// Generate a class stucture for this class.
virtual void GenerateClass(const ObjCImplementationDecl *OID) = 0;
/// Generate an Objective-C message send operation.
virtual CodeGen::RValue
GenerateMessageSend(CodeGen::CodeGenFunction &CGF,
const ObjCMessageExpr *E,
llvm::Value *Receiver) = 0;
/// Generate an Objective-C message send operation to the super
/// class.
virtual CodeGen::RValue
GenerateMessageSendSuper(CodeGen::CodeGenFunction &CGF,
const ObjCMessageExpr *E,
const ObjCInterfaceDecl *SuperClass,
llvm::Value *Receiver) = 0;
/// Emit the code to return the named protocol as an object, as in a
/// @protocol expression.
virtual llvm::Value *GenerateProtocolRef(llvm::IRBuilder<true> &Builder,
const ObjCProtocolDecl *OPD) = 0;
/// Generate the named protocol. Protocols contain method metadata but no
/// implementations.
virtual void GenerateProtocol(const ObjCProtocolDecl *OPD) = 0;
/// Generate a function preamble for a method with the specified
/// types.
// FIXME: Current this just generates the Function definition, but
// really this should also be generating the loads of the
// parameters, as the runtime should have full control over how
// parameters are passed.
virtual llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD) = 0;
/// GetClass - Return a reference to the class for the given
/// interface decl.
virtual llvm::Value *GetClass(BuilderType &Builder,
const ObjCInterfaceDecl *OID) = 0;
/// If instance variable addresses are determined at runtime then this should
/// return true, otherwise instance variables will be accessed directly from
/// the structure. If this returns true then @defs is invalid for this
/// runtime and a warning should be generated.
virtual bool LateBoundIVars() { return false; }
};
/// Creates an instance of an Objective-C runtime class.
//TODO: This should include some way of selecting which runtime to target.
CGObjCRuntime *CreateGNUObjCRuntime(CodeGenModule &CGM);
CGObjCRuntime *CreateMacObjCRuntime(CodeGenModule &CGM);
}
}
#endif
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