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//===----- CGObjCRuntime.h - Emit LLVM Code from ASTs for a Module --------===//
//
// 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 "llvm/ADT/SmallVector.h"
#include <string>
namespace llvm {
class IRBuilder;
class Constant;
class Type;
class Value;
class Module;
class Function;
}
namespace clang {
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 {
public:
virtual ~CGObjCRuntime();
/// Generate an Objective-C message send operation
virtual llvm::Value *GenerateMessageSend(llvm::IRBuilder &Builder,
const llvm::Type *ReturnTy,
llvm::Value *Sender,
llvm::Value *Receiver,
Selector Sel,
llvm::Value** ArgV,
unsigned ArgC) =0;
/// 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
virtual llvm::Value *GetSelector(llvm::IRBuilder &Builder, Selector Sel) = 0;
/// Generate a constant string object
virtual llvm::Constant *GenerateConstantString(const char *String,
const size_t Length) = 0;
/// Generate a category. A category contains a list of methods (and
/// accompanying metadata) and a list of protocols.
virtual void GenerateCategory(const char *ClassName, const char *CategoryName,
const llvm::SmallVectorImpl<Selector> &InstanceMethodSels,
const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes,
const llvm::SmallVectorImpl<Selector> &ClassMethodSels,
const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes,
const llvm::SmallVectorImpl<std::string> &Protocols) =0;
/// Generate a class stucture for this class.
virtual void GenerateClass(
const char *ClassName,
const char *SuperClassName,
const int instanceSize,
const llvm::SmallVectorImpl<llvm::Constant *> &IvarNames,
const llvm::SmallVectorImpl<llvm::Constant *> &IvarTypes,
const llvm::SmallVectorImpl<llvm::Constant *> &IvarOffsets,
const llvm::SmallVectorImpl<Selector> &InstanceMethodSels,
const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes,
const llvm::SmallVectorImpl<Selector> &ClassMethodSels,
const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes,
const llvm::SmallVectorImpl<std::string> &Protocols) =0;
/// Generate a reference to the named protocol.
virtual llvm::Value *GenerateProtocolRef(llvm::IRBuilder &Builder, const char
*ProtocolName) =0;
virtual llvm::Value *GenerateMessageSendSuper(llvm::IRBuilder &Builder,
const llvm::Type *ReturnTy,
llvm::Value *Sender,
const char *SuperClassName,
llvm::Value *Receiver,
Selector Sel,
llvm::Value** ArgV,
unsigned ArgC) = 0;
/// Generate the named protocol. Protocols contain method metadata but no
/// implementations.
virtual void GenerateProtocol(const char *ProtocolName,
const llvm::SmallVectorImpl<std::string> &Protocols,
const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodNames,
const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes,
const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodNames,
const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes) =0;
/// Generate a function preamble for a method with the specified types
virtual llvm::Function *MethodPreamble(
const std::string &ClassName,
const std::string &CategoryName,
const std::string &MethodName,
const llvm::Type *ReturnTy,
const llvm::Type *SelfTy,
const llvm::Type **ArgTy,
unsigned ArgC,
bool isClassMethod,
bool isVarArg) = 0;
/// Look up the class for the specified name
virtual llvm::Value *LookupClass(llvm::IRBuilder &Builder, llvm::Value
*ClassName) =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 *CreateObjCRuntime(CodeGenModule &CGM);
}
}
#endif
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