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//===------- CGObjCGNU.cpp - 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 Objective-C code generation targetting the GNU runtime.
//
//===----------------------------------------------------------------------===//
#include "CGObjCRuntime.h"
#include "llvm/Module.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/IRBuilder.h"
#include "llvm/ADT/SmallVector.h"
namespace {
class CGObjCGNU : public clang::CodeGen::CGObjCRuntime {
private:
llvm::Module &TheModule;
const llvm::Type *SelectorTy;
const llvm::Type *PtrToInt8Ty;
const llvm::Type *IMPTy;
const llvm::Type *IdTy;
const llvm::Type *IntTy;
const llvm::Type *PtrTy;
const llvm::Type *LongTy;
const llvm::Type *PtrToIntTy;
public:
CGObjCGNU(llvm::Module &Mp,
const llvm::Type *LLVMIntType,
const llvm::Type *LLVMLongType);
virtual llvm::Value *generateMessageSend(llvm::IRBuilder &Builder,
const llvm::Type *ReturnTy,
llvm::Value *Sender,
llvm::Value *Receiver,
llvm::Value *Selector,
llvm::Value** ArgV,
unsigned ArgC);
llvm::Value *getSelector(llvm::IRBuilder &Builder,
llvm::Value *SelName,
llvm::Value *SelTypes);
virtual llvm::Function *MethodPreamble(const llvm::Type *ReturnTy,
const llvm::Type *SelfTy,
const llvm::Type **ArgTy,
unsigned ArgC,
bool isVarArg);
};
} // end anonymous namespace
CGObjCGNU::CGObjCGNU(llvm::Module &M,
const llvm::Type *LLVMIntType,
const llvm::Type *LLVMLongType) :
TheModule(M),
IntTy(LLVMIntType),
LongTy(LLVMLongType)
{
// C string type. Used in lots of places.
PtrToInt8Ty =
llvm::PointerType::getUnqual(llvm::Type::Int8Ty);
// Get the selector Type.
const llvm::Type *SelStructTy = llvm::StructType::get(
PtrToInt8Ty,
PtrToInt8Ty,
NULL);
SelectorTy = llvm::PointerType::getUnqual(SelStructTy);
PtrToIntTy = llvm::PointerType::getUnqual(IntTy);
PtrTy = PtrToInt8Ty;
// Object type
llvm::PATypeHolder OpaqueObjTy = llvm::OpaqueType::get();
llvm::Type *OpaqueIdTy = llvm::PointerType::getUnqual(OpaqueObjTy);
IdTy = llvm::StructType::get(OpaqueIdTy, NULL);
llvm::cast<llvm::OpaqueType>(OpaqueObjTy.get())->refineAbstractTypeTo(IdTy);
IdTy = llvm::cast<llvm::StructType>(OpaqueObjTy.get());
IdTy = llvm::PointerType::getUnqual(IdTy);
// IMP type
std::vector<const llvm::Type*> IMPArgs;
IMPArgs.push_back(IdTy);
IMPArgs.push_back(SelectorTy);
IMPTy = llvm::FunctionType::get(IdTy, IMPArgs, true);
}
/// Looks up the selector for the specified name / type pair.
// FIXME: Selectors should be statically cached, not looked up on every call.
llvm::Value *CGObjCGNU::getSelector(llvm::IRBuilder &Builder,
llvm::Value *SelName,
llvm::Value *SelTypes)
{
// Look up the selector.
llvm::Value *cmd;
if(SelTypes == 0) {
llvm::Constant *SelFunction = TheModule.getOrInsertFunction("sel_get_uid",
SelectorTy,
PtrToInt8Ty,
NULL);
cmd = Builder.CreateCall(SelFunction, SelName);
}
else {
llvm::Constant *SelFunction =
TheModule.getOrInsertFunction("sel_get_typed_uid",
SelectorTy,
PtrToInt8Ty,
PtrToInt8Ty,
NULL);
llvm::Value *Args[] = { SelName, SelTypes };
cmd = Builder.CreateCall(SelFunction, Args, Args+2);
}
return cmd;
}
/// Generate code for a message send expression on the GNU runtime.
// FIXME: Much of this code will need factoring out later.
// TODO: This should take a sender argument (pointer to self in the calling
// context)
llvm::Value *CGObjCGNU::generateMessageSend(llvm::IRBuilder &Builder,
const llvm::Type *ReturnTy,
llvm::Value *Sender,
llvm::Value *Receiver,
llvm::Value *Selector,
llvm::Value** ArgV,
unsigned ArgC) {
llvm::Value *cmd = getSelector(Builder, Selector, 0);
// Look up the method implementation.
std::vector<const llvm::Type*> impArgTypes;
impArgTypes.push_back(Receiver->getType());
impArgTypes.push_back(SelectorTy);
// Avoid an explicit cast on the IMP by getting a version that has the right
// return type.
llvm::FunctionType *impType = llvm::FunctionType::get(ReturnTy, impArgTypes,
true);
llvm::Constant *lookupFunction =
TheModule.getOrInsertFunction("objc_msg_lookup",
llvm::PointerType::getUnqual(impType),
Receiver->getType(), SelectorTy, NULL);
llvm::SmallVector<llvm::Value*, 16> lookupArgs;
lookupArgs.push_back(Receiver);
lookupArgs.push_back(cmd);
llvm::Value *imp = Builder.CreateCall(lookupFunction,
lookupArgs.begin(), lookupArgs.end());
// Call the method.
lookupArgs.insert(lookupArgs.end(), ArgV, ArgV+ArgC);
return Builder.CreateCall(imp, lookupArgs.begin(), lookupArgs.end());
}
llvm::Function *CGObjCGNU::MethodPreamble(
const llvm::Type *ReturnTy,
const llvm::Type *SelfTy,
const llvm::Type **ArgTy,
unsigned ArgC,
bool isVarArg) {
std::vector<const llvm::Type*> Args;
Args.push_back(SelfTy);
Args.push_back(SelectorTy);
Args.insert(Args.end(), ArgTy, ArgTy+ArgC);
llvm::FunctionType *MethodTy = llvm::FunctionType::get(ReturnTy,
Args,
isVarArg);
llvm::Function *Method = llvm::Function::Create(MethodTy,
llvm::GlobalValue::InternalLinkage,
".objc.method",
&TheModule);
// Set the names of the hidden arguments
llvm::Function::arg_iterator AI = Method->arg_begin();
AI->setName("self");
++AI;
AI->setName("_cmd");
return Method;
}
clang::CodeGen::CGObjCRuntime *clang::CodeGen::CreateObjCRuntime(
llvm::Module &M,
const llvm::Type *LLVMIntType,
const llvm::Type *LLVMLongType) {
return new CGObjCGNU(M, LLVMIntType, LLVMLongType);
}
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