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llvm-project/clang/lib/CodeGen/CGObjCGNU.cpp

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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. The
// class in this file generates structures used by the GNU Objective-C runtime
// library. These structures are defined in objc/objc.h and objc/objc-api.h in
// the GNU runtime distribution.
//
//===----------------------------------------------------------------------===//
#include "CGObjCRuntime.h"
#include "llvm/Module.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/IRBuilder.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include <map>
using llvm::dyn_cast;
// The version of the runtime that this class targets. Must match the version
// in the runtime.
static const int RuntimeVersion = 8;
static const int ProtocolVersion = 2;
namespace {
class CGObjCGNU : public clang::CodeGen::CGObjCRuntime {
private:
llvm::Module &TheModule;
const llvm::StructType *SelStructTy;
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;
std::vector<llvm::Constant*> Classes;
std::vector<llvm::Constant*> Categories;
std::vector<llvm::Constant*> ConstantStrings;
llvm::Function *LoadFunction;
llvm::StringMap<llvm::Constant*> ExistingProtocols;
typedef std::pair<std::string, std::string> TypedSelector;
std::map<TypedSelector, llvm::GlobalAlias*> TypedSelectors;
llvm::StringMap<llvm::GlobalAlias*> UntypedSelectors;
// Some zeros used for GEPs in lots of places.
llvm::Constant *Zeros[2];
llvm::Constant *NULLPtr;
private:
llvm::Constant *GenerateIvarList(
const llvm::SmallVectorImpl<llvm::Constant *> &IvarNames,
const llvm::SmallVectorImpl<llvm::Constant *> &IvarTypes,
const llvm::SmallVectorImpl<llvm::Constant *> &IvarOffsets);
llvm::Constant *GenerateMethodList(const std::string &ClassName,
const std::string &CategoryName,
const llvm::SmallVectorImpl<llvm::Constant *> &MethodNames,
const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes,
bool isClassMethodList);
llvm::Constant *GenerateProtocolList(
const llvm::SmallVectorImpl<std::string> &Protocols);
llvm::Constant *GenerateClassStructure(
llvm::Constant *MetaClass,
llvm::Constant *SuperClass,
unsigned info,
llvm::Constant *Name,
llvm::Constant *Version,
llvm::Constant *InstanceSize,
llvm::Constant *IVars,
llvm::Constant *Methods,
llvm::Constant *Protocols);
llvm::Constant *GenerateProtocolMethodList(
const llvm::SmallVectorImpl<llvm::Constant *> &MethodNames,
const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes);
llvm::Constant *MakeConstantString(const std::string &Str, const std::string
&Name="");
llvm::Constant *MakeGlobal(const llvm::StructType *Ty,
std::vector<llvm::Constant*> &V, const std::string &Name="");
llvm::Constant *MakeGlobal(const llvm::ArrayType *Ty,
std::vector<llvm::Constant*> &V, const std::string &Name="");
public:
CGObjCGNU(llvm::Module &Mp,
const llvm::Type *LLVMIntType,
const llvm::Type *LLVMLongType);
virtual llvm::Constant *GenerateConstantString(const char *String,
const size_t length);
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);
virtual llvm::Value *GenerateMessageSendSuper(llvm::IRBuilder &Builder,
const llvm::Type *ReturnTy,
llvm::Value *Sender,
const char *SuperClassName,
llvm::Value *Receiver,
llvm::Value *Selector,
llvm::Value** ArgV,
unsigned ArgC);
virtual llvm::Value *LookupClass(llvm::IRBuilder &Builder, llvm::Value
*ClassName);
virtual llvm::Value *GetSelector(llvm::IRBuilder &Builder,
llvm::Value *SelName,
llvm::Value *SelTypes);
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);
virtual void GenerateCategory(const char *ClassName, const char *CategoryName,
const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodNames,
const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes,
const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodNames,
const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes,
const llvm::SmallVectorImpl<std::string> &Protocols);
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<llvm::Constant *> &InstanceMethodNames,
const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes,
const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodNames,
const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes,
const llvm::SmallVectorImpl<std::string> &Protocols);
virtual llvm::Value *GenerateProtocolRef(llvm::IRBuilder &Builder, const char
*ProtocolName);
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);
virtual llvm::Function *ModuleInitFunction();
};
} // end anonymous namespace
static std::string SymbolNameForClass(const std::string &ClassName) {
return ".objc_class_" + ClassName;
}
static std::string SymbolNameForMethod(const std::string &ClassName, const
std::string &CategoryName, const std::string &MethodName, bool isClassMethod)
{
return "._objc_method_" + ClassName +"("+CategoryName+")"+
(isClassMethod ? "+" : "-") + MethodName;
}
CGObjCGNU::CGObjCGNU(llvm::Module &M,
const llvm::Type *LLVMIntType,
const llvm::Type *LLVMLongType) :
TheModule(M),
IntTy(LLVMIntType),
LongTy(LLVMLongType)
{
Zeros[0] = llvm::ConstantInt::get(llvm::Type::Int32Ty, 0);
Zeros[1] = Zeros[0];
NULLPtr = llvm::ConstantPointerNull::get(
llvm::PointerType::getUnqual(llvm::Type::Int8Ty));
// C string type. Used in lots of places.
PtrToInt8Ty =
llvm::PointerType::getUnqual(llvm::Type::Int8Ty);
// Get the selector 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);
}
// This has to perform the lookup every time, since posing and related
// techniques can modify the name -> class mapping.
llvm::Value *CGObjCGNU::LookupClass(llvm::IRBuilder &Builder,
llvm::Value *ClassName) {
llvm::Constant *ClassLookupFn =
TheModule.getOrInsertFunction("objc_lookup_class", IdTy, PtrToInt8Ty,
NULL);
return Builder.CreateCall(ClassLookupFn, ClassName);
}
/// 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) {
// For static selectors, we return an alias for now then store them all in a
// list that the runtime will initialise later.
if (llvm::Constant *CName = dyn_cast<llvm::Constant>(SelName)) {
// Untyped selector
if (SelTypes == 0) {
// If it's already cached, return it.
if (UntypedSelectors[CName->getStringValue()]) {
// FIXME: Volatility
return Builder.CreateLoad(UntypedSelectors[CName->getStringValue()]);
}
// If it isn't, cache it.
llvm::GlobalAlias *Sel = new llvm::GlobalAlias(
llvm::PointerType::getUnqual(SelectorTy),
llvm::GlobalValue::InternalLinkage, ".objc_untyped_selector_alias",
NULL, &TheModule);
UntypedSelectors[CName->getStringValue()] = Sel;
// FIXME: Volatility
return Builder.CreateLoad(Sel);
}
// Typed selectors
if (llvm::Constant *CTypes = dyn_cast<llvm::Constant>(SelTypes)) {
TypedSelector Selector = TypedSelector(CName->getStringValue(),
CTypes->getStringValue());
// If it's already cached, return it.
if (TypedSelectors[Selector]) {
// FIXME: Volatility
return Builder.CreateLoad(TypedSelectors[Selector]);
}
// If it isn't, cache it.
llvm::GlobalAlias *Sel = new llvm::GlobalAlias(
llvm::PointerType::getUnqual(SelectorTy),
llvm::GlobalValue::InternalLinkage, ".objc_typed_selector_alias",
NULL, &TheModule);
TypedSelectors[Selector] = Sel;
// FIXME: Volatility
return Builder.CreateLoad(Sel);
}
}
// Dynamically look up selectors from non-constant sources
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);
cmd = Builder.CreateCall2(SelFunction, SelName, SelTypes);
}
return cmd;
}
llvm::Constant *CGObjCGNU::MakeConstantString(const std::string &Str, const
std::string &Name) {
llvm::Constant * ConstStr = llvm::ConstantArray::get(Str);
ConstStr = new llvm::GlobalVariable(ConstStr->getType(), true,
llvm::GlobalValue::InternalLinkage,
ConstStr, Name, &TheModule);
return llvm::ConstantExpr::getGetElementPtr(ConstStr, Zeros, 2);
}
llvm::Constant *CGObjCGNU::MakeGlobal(const llvm::StructType *Ty,
std::vector<llvm::Constant*> &V, const std::string &Name) {
llvm::Constant *C = llvm::ConstantStruct::get(Ty, V);
return new llvm::GlobalVariable(Ty, false,
llvm::GlobalValue::InternalLinkage, C, Name, &TheModule);
}
llvm::Constant *CGObjCGNU::MakeGlobal(const llvm::ArrayType *Ty,
std::vector<llvm::Constant*> &V, const std::string &Name) {
llvm::Constant *C = llvm::ConstantArray::get(Ty, V);
return new llvm::GlobalVariable(Ty, false,
llvm::GlobalValue::InternalLinkage, C, Name, &TheModule);
}
/// Generate an NSConstantString object.
//TODO: In case there are any crazy people still using the GNU runtime without
//an OpenStep implementation, this should let them select their own class for
//constant strings.
llvm::Constant *CGObjCGNU::GenerateConstantString(const char *String, const
size_t length) {
std::vector<llvm::Constant*> Ivars;
Ivars.push_back(NULLPtr);
Ivars.push_back(MakeConstantString(String));
Ivars.push_back(llvm::ConstantInt::get(IntTy, length));
llvm::Constant *ObjCStr = MakeGlobal(
llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, IntTy, NULL),
Ivars, ".objc_str");
ConstantStrings.push_back(
llvm::ConstantExpr::getBitCast(ObjCStr, PtrToInt8Ty));
return ObjCStr;
}
///Generates a message send where the super is the receiver. This is a message
///send to self with special delivery semantics indicating which class's method
///should be called.
llvm::Value *CGObjCGNU::GenerateMessageSendSuper(llvm::IRBuilder &Builder,
const llvm::Type *ReturnTy,
llvm::Value *Sender,
const char *SuperClassName,
llvm::Value *Receiver,
llvm::Value *Selector,
llvm::Value** ArgV,
unsigned ArgC) {
// TODO: This should be cached, not looked up every time.
llvm::Value *ReceiverClass = LookupClass(Builder,
MakeConstantString(SuperClassName));
llvm::Value *cmd = GetSelector(Builder, Selector, 0);
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);
// Construct the structure used to look up the IMP
llvm::StructType *ObjCSuperTy = llvm::StructType::get(Receiver->getType(),
IdTy, NULL);
llvm::Value *ObjCSuper = Builder.CreateAlloca(ObjCSuperTy);
// FIXME: volatility
Builder.CreateStore(Receiver, Builder.CreateStructGEP(ObjCSuper, 0));
Builder.CreateStore(ReceiverClass, Builder.CreateStructGEP(ObjCSuper, 1));
// Get the IMP
llvm::Constant *lookupFunction =
TheModule.getOrInsertFunction("objc_msg_lookup_super",
llvm::PointerType::getUnqual(impType),
llvm::PointerType::getUnqual(ObjCSuperTy),
SelectorTy, NULL);
llvm::Value *lookupArgs[] = {ObjCSuper, cmd};
llvm::Value *imp = Builder.CreateCall(lookupFunction, lookupArgs,
lookupArgs+2);
// Call the method
llvm::SmallVector<llvm::Value*, 8> callArgs;
callArgs.push_back(Receiver);
callArgs.push_back(cmd);
callArgs.insert(callArgs.end(), ArgV, ArgV+ArgC);
return Builder.CreateCall(imp, callArgs.begin(), callArgs.end());
}
/// Generate code for a message send expression.
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;
const llvm::Type *RetTy;
//TODO: Revisit this when LLVM supports aggregate return types.
if (ReturnTy->isSingleValueType() && ReturnTy != llvm::Type::VoidTy) {
RetTy = ReturnTy;
} else {
// For struct returns allocate the space in the caller and pass it up to
// the sender.
RetTy = llvm::Type::VoidTy;
impArgTypes.push_back(llvm::PointerType::getUnqual(ReturnTy));
}
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(RetTy, impArgTypes,
true);
llvm::Constant *lookupFunction =
TheModule.getOrInsertFunction("objc_msg_lookup",
llvm::PointerType::getUnqual(impType),
Receiver->getType(), SelectorTy, NULL);
llvm::Value *imp = Builder.CreateCall2(lookupFunction, Receiver, cmd);
// Call the method.
llvm::SmallVector<llvm::Value*, 16> Args;
if (!ReturnTy->isSingleValueType()) {
llvm::Value *Return = Builder.CreateAlloca(ReturnTy);
Args.push_back(Return);
return Return;
}
Args.push_back(Receiver);
Args.push_back(cmd);
Args.insert(Args.end(), ArgV, ArgV+ArgC);
return Builder.CreateCall(imp, Args.begin(), Args.end());
}
/// Generates a MethodList. Used in construction of a objc_class and
/// objc_category structures.
llvm::Constant *CGObjCGNU::GenerateMethodList(const std::string &ClassName,
const std::string &CategoryName,
const llvm::SmallVectorImpl<llvm::Constant *> &MethodNames,
const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes,
bool isClassMethodList) {
// Get the method structure type.
llvm::StructType *ObjCMethodTy = llvm::StructType::get(
PtrToInt8Ty, // Really a selector, but the runtime creates it us.
PtrToInt8Ty, // Method types
llvm::PointerType::getUnqual(IMPTy), //Method pointer
NULL);
std::vector<llvm::Constant*> Methods;
std::vector<llvm::Constant*> Elements;
for (unsigned int i = 0, e = MethodTypes.size(); i < e; ++i) {
Elements.clear();
Elements.push_back( llvm::ConstantExpr::getGetElementPtr(MethodNames[i],
Zeros, 2));
Elements.push_back(
llvm::ConstantExpr::getGetElementPtr(MethodTypes[i], Zeros, 2));
llvm::Constant *Method =
TheModule.getFunction(SymbolNameForMethod(ClassName, CategoryName,
MethodNames[i]->getStringValue(), isClassMethodList));
Method = llvm::ConstantExpr::getBitCast(Method,
llvm::PointerType::getUnqual(IMPTy));
Elements.push_back(Method);
Methods.push_back(llvm::ConstantStruct::get(ObjCMethodTy, Elements));
}
// Array of method structures
llvm::ArrayType *ObjCMethodArrayTy = llvm::ArrayType::get(ObjCMethodTy,
MethodNames.size());
llvm::Constant *MethodArray = llvm::ConstantArray::get(ObjCMethodArrayTy,
Methods);
// Structure containing list pointer, array and array count
llvm::SmallVector<const llvm::Type*, 16> ObjCMethodListFields;
llvm::PATypeHolder OpaqueNextTy = llvm::OpaqueType::get();
llvm::Type *NextPtrTy = llvm::PointerType::getUnqual(OpaqueNextTy);
llvm::StructType *ObjCMethodListTy = llvm::StructType::get(NextPtrTy,
IntTy,
ObjCMethodArrayTy,
NULL);
// Refine next pointer type to concrete type
llvm::cast<llvm::OpaqueType>(
OpaqueNextTy.get())->refineAbstractTypeTo(ObjCMethodListTy);
ObjCMethodListTy = llvm::cast<llvm::StructType>(OpaqueNextTy.get());
Methods.clear();
Methods.push_back(llvm::ConstantPointerNull::get(
llvm::PointerType::getUnqual(ObjCMethodListTy)));
Methods.push_back(llvm::ConstantInt::get(llvm::Type::Int32Ty,
MethodTypes.size()));
Methods.push_back(MethodArray);
// Create an instance of the structure
return MakeGlobal(ObjCMethodListTy, Methods, ".objc_method_list");
}
/// Generates an IvarList. Used in construction of a objc_class.
llvm::Constant *CGObjCGNU::GenerateIvarList(
const llvm::SmallVectorImpl<llvm::Constant *> &IvarNames,
const llvm::SmallVectorImpl<llvm::Constant *> &IvarTypes,
const llvm::SmallVectorImpl<llvm::Constant *> &IvarOffsets) {
// Get the method structure type.
llvm::StructType *ObjCIvarTy = llvm::StructType::get(
PtrToInt8Ty,
PtrToInt8Ty,
IntTy,
NULL);
std::vector<llvm::Constant*> Ivars;
std::vector<llvm::Constant*> Elements;
for (unsigned int i = 0, e = IvarNames.size() ; i < e ; i++) {
Elements.clear();
Elements.push_back( llvm::ConstantExpr::getGetElementPtr(IvarNames[i],
Zeros, 2));
Elements.push_back( llvm::ConstantExpr::getGetElementPtr(IvarTypes[i],
Zeros, 2));
Elements.push_back(IvarOffsets[i]);
Ivars.push_back(llvm::ConstantStruct::get(ObjCIvarTy, Elements));
}
// Array of method structures
llvm::ArrayType *ObjCIvarArrayTy = llvm::ArrayType::get(ObjCIvarTy,
IvarNames.size());
Elements.clear();
Elements.push_back(llvm::ConstantInt::get(
llvm::cast<llvm::IntegerType>(IntTy), (int)IvarNames.size()));
Elements.push_back(llvm::ConstantArray::get(ObjCIvarArrayTy, Ivars));
// Structure containing array and array count
llvm::StructType *ObjCIvarListTy = llvm::StructType::get(IntTy,
ObjCIvarArrayTy,
NULL);
// Create an instance of the structure
return MakeGlobal(ObjCIvarListTy, Elements, ".objc_ivar_list");
}
/// Generate a class structure
llvm::Constant *CGObjCGNU::GenerateClassStructure(
llvm::Constant *MetaClass,
llvm::Constant *SuperClass,
unsigned info,
llvm::Constant *Name,
llvm::Constant *Version,
llvm::Constant *InstanceSize,
llvm::Constant *IVars,
llvm::Constant *Methods,
llvm::Constant *Protocols) {
// Set up the class structure
// Note: Several of these are char*s when they should be ids. This is
// because the runtime performs this translation on load.
llvm::StructType *ClassTy = llvm::StructType::get(
PtrToInt8Ty, // class_pointer
PtrToInt8Ty, // super_class
PtrToInt8Ty, // name
LongTy, // version
LongTy, // info
LongTy, // instance_size
IVars->getType(), // ivars
Methods->getType(), // methods
// These are all filled in by the runtime, so we pretend
PtrTy, // dtable
PtrTy, // subclass_list
PtrTy, // sibling_class
PtrTy, // protocols
PtrTy, // gc_object_type
NULL);
llvm::Constant *Zero = llvm::ConstantInt::get(LongTy, 0);
llvm::Constant *NullP =
llvm::ConstantPointerNull::get(llvm::cast<llvm::PointerType>(PtrTy));
// Fill in the structure
std::vector<llvm::Constant*> Elements;
Elements.push_back(llvm::ConstantExpr::getBitCast(MetaClass, PtrToInt8Ty));
Elements.push_back(SuperClass);
Elements.push_back(Name);
Elements.push_back(Zero);
Elements.push_back(llvm::ConstantInt::get(LongTy, info));
Elements.push_back(InstanceSize);
Elements.push_back(IVars);
Elements.push_back(Methods);
Elements.push_back(NullP);
Elements.push_back(NullP);
Elements.push_back(NullP);
Elements.push_back(llvm::ConstantExpr::getBitCast(Protocols, PtrTy));
Elements.push_back(NullP);
// Create an instance of the structure
return MakeGlobal(ClassTy, Elements,
SymbolNameForClass(Name->getStringValue()));
}
llvm::Constant *CGObjCGNU::GenerateProtocolMethodList(
const llvm::SmallVectorImpl<llvm::Constant *> &MethodNames,
const llvm::SmallVectorImpl<llvm::Constant *> &MethodTypes) {
// Get the method structure type.
llvm::StructType *ObjCMethodDescTy = llvm::StructType::get(
PtrToInt8Ty, // Really a selector, but the runtime does the casting for us.
PtrToInt8Ty,
NULL);
std::vector<llvm::Constant*> Methods;
std::vector<llvm::Constant*> Elements;
for (unsigned int i = 0, e = MethodTypes.size() ; i < e ; i++) {
Elements.clear();
Elements.push_back( llvm::ConstantExpr::getGetElementPtr(MethodNames[i],
Zeros, 2));
Elements.push_back(
llvm::ConstantExpr::getGetElementPtr(MethodTypes[i], Zeros, 2));
Methods.push_back(llvm::ConstantStruct::get(ObjCMethodDescTy, Elements));
}
llvm::ArrayType *ObjCMethodArrayTy = llvm::ArrayType::get(ObjCMethodDescTy,
MethodNames.size());
llvm::Constant *Array = llvm::ConstantArray::get(ObjCMethodArrayTy, Methods);
llvm::StructType *ObjCMethodDescListTy = llvm::StructType::get(
IntTy, ObjCMethodArrayTy, NULL);
Methods.clear();
Methods.push_back(llvm::ConstantInt::get(IntTy, MethodNames.size()));
Methods.push_back(Array);
return MakeGlobal(ObjCMethodDescListTy, Methods, ".objc_method_list");
}
// Create the protocol list structure used in classes, categories and so on
llvm::Constant *CGObjCGNU::GenerateProtocolList(
const llvm::SmallVectorImpl<std::string> &Protocols) {
llvm::ArrayType *ProtocolArrayTy = llvm::ArrayType::get(PtrToInt8Ty,
Protocols.size());
llvm::StructType *ProtocolListTy = llvm::StructType::get(
PtrTy, //Should be a recurisve pointer, but it's always NULL here.
LongTy,//FIXME: Should be size_t
ProtocolArrayTy,
NULL);
std::vector<llvm::Constant*> Elements;
for (const std::string *iter = Protocols.begin(), *endIter = Protocols.end();
iter != endIter ; iter++) {
llvm::Constant *Ptr =
llvm::ConstantExpr::getBitCast(ExistingProtocols[*iter], PtrToInt8Ty);
Elements.push_back(Ptr);
}
llvm::Constant * ProtocolArray = llvm::ConstantArray::get(ProtocolArrayTy,
Elements);
Elements.clear();
Elements.push_back(NULLPtr);
Elements.push_back(llvm::ConstantInt::get(
llvm::cast<llvm::IntegerType>(LongTy), Protocols.size()));
Elements.push_back(ProtocolArray);
return MakeGlobal(ProtocolListTy, Elements, ".objc_protocol_list");
}
llvm::Value *CGObjCGNU::GenerateProtocolRef(llvm::IRBuilder &Builder, const
char *ProtocolName) {
return ExistingProtocols[ProtocolName];
}
void CGObjCGNU::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) {
llvm::Constant *ProtocolList = GenerateProtocolList(Protocols);
llvm::Constant *InstanceMethodList =
GenerateProtocolMethodList(InstanceMethodNames, InstanceMethodTypes);
llvm::Constant *ClassMethodList =
GenerateProtocolMethodList(ClassMethodNames, ClassMethodTypes);
// Protocols are objects containing lists of the methods implemented and
// protocols adopted.
llvm::StructType *ProtocolTy = llvm::StructType::get(IdTy,
PtrToInt8Ty,
ProtocolList->getType(),
InstanceMethodList->getType(),
ClassMethodList->getType(),
NULL);
std::vector<llvm::Constant*> Elements;
// The isa pointer must be set to a magic number so the runtime knows it's
// the correct layout.
Elements.push_back(llvm::ConstantExpr::getIntToPtr(
llvm::ConstantInt::get(llvm::Type::Int32Ty, ProtocolVersion), IdTy));
Elements.push_back(MakeConstantString(ProtocolName, ".objc_protocol_name"));
Elements.push_back(ProtocolList);
Elements.push_back(InstanceMethodList);
Elements.push_back(ClassMethodList);
ExistingProtocols[ProtocolName] =
llvm::ConstantExpr::getBitCast(MakeGlobal(ProtocolTy, Elements,
".objc_protocol"), IdTy);
}
void CGObjCGNU::GenerateCategory(
const char *ClassName,
const char *CategoryName,
const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodNames,
const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes,
const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodNames,
const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes,
const llvm::SmallVectorImpl<std::string> &Protocols) {
std::vector<llvm::Constant*> Elements;
Elements.push_back(MakeConstantString(CategoryName));
Elements.push_back(MakeConstantString(ClassName));
// Instance method list
Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList(
ClassName, CategoryName, InstanceMethodNames, InstanceMethodTypes,
false), PtrTy));
// Class method list
Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList(
ClassName, CategoryName, ClassMethodNames, ClassMethodTypes, true),
PtrTy));
// Protocol list
Elements.push_back(llvm::ConstantExpr::getBitCast(
GenerateProtocolList(Protocols), PtrTy));
Categories.push_back(llvm::ConstantExpr::getBitCast(
MakeGlobal(llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, PtrTy,
PtrTy, PtrTy, NULL), Elements), PtrTy));
}
void CGObjCGNU::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<llvm::Constant *> &InstanceMethodNames,
const llvm::SmallVectorImpl<llvm::Constant *> &InstanceMethodTypes,
const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodNames,
const llvm::SmallVectorImpl<llvm::Constant *> &ClassMethodTypes,
const llvm::SmallVectorImpl<std::string> &Protocols) {
// Get the superclass pointer.
llvm::Constant *SuperClass;
if (SuperClassName) {
SuperClass = MakeConstantString(SuperClassName, ".super_class_name");
} else {
SuperClass = llvm::ConstantPointerNull::get(
llvm::cast<llvm::PointerType>(PtrToInt8Ty));
}
llvm::Constant * Name = MakeConstantString(ClassName, ".class_name");
// Empty vector used to construct empty method lists
llvm::SmallVector<llvm::Constant*, 1> empty;
// Generate the method and instance variable lists
llvm::Constant *MethodList = GenerateMethodList(ClassName, "",
InstanceMethodNames, InstanceMethodTypes, false);
llvm::Constant *ClassMethodList = GenerateMethodList(ClassName, "",
ClassMethodNames, ClassMethodTypes, true);
llvm::Constant *IvarList = GenerateIvarList(IvarNames, IvarTypes,
IvarOffsets);
//Generate metaclass for class methods
llvm::Constant *MetaClassStruct = GenerateClassStructure(NULLPtr,
NULLPtr, 0x2L, NULLPtr, 0, Zeros[0], GenerateIvarList(
empty, empty, empty), ClassMethodList, NULLPtr);
// Generate the class structure
llvm::Constant *ClassStruct = GenerateClassStructure(MetaClassStruct,
SuperClass, 0x1L, Name, 0,
llvm::ConstantInt::get(llvm::Type::Int32Ty, instanceSize), IvarList,
MethodList, GenerateProtocolList(Protocols));
// Add class structure to list to be added to the symtab later
ClassStruct = llvm::ConstantExpr::getBitCast(ClassStruct, PtrToInt8Ty);
Classes.push_back(ClassStruct);
}
llvm::Function *CGObjCGNU::ModuleInitFunction() {
// Only emit an ObjC load function if no Objective-C stuff has been called
if (Classes.empty() && Categories.empty() && ConstantStrings.empty() &&
ExistingProtocols.empty() && TypedSelectors.empty() &&
UntypedSelectors.empty())
return NULL;
// Name the ObjC types to make the IR a bit easier to read
TheModule.addTypeName(".objc_selector", SelectorTy);
TheModule.addTypeName(".objc_id", IdTy);
TheModule.addTypeName(".objc_imp", IMPTy);
std::vector<llvm::Constant*> Elements;
// Generate statics list:
llvm::ArrayType *StaticsArrayTy = llvm::ArrayType::get(PtrToInt8Ty,
ConstantStrings.size() + 1);
ConstantStrings.push_back(NULLPtr);
Elements.push_back(MakeConstantString("NSConstantString",
".objc_static_class_name"));
Elements.push_back(llvm::ConstantArray::get(StaticsArrayTy, ConstantStrings));
llvm::StructType *StaticsListTy =
llvm::StructType::get(PtrToInt8Ty, StaticsArrayTy, NULL);
llvm::Constant *Statics =
MakeGlobal(StaticsListTy, Elements, ".objc_statics");
Statics = new
llvm::GlobalVariable(llvm::PointerType::getUnqual(StaticsListTy), false,
llvm::GlobalValue::InternalLinkage, Statics, ".objc_statics_ptr",
&TheModule);
Statics = llvm::ConstantExpr::getBitCast(Statics, PtrTy);
// Array of classes, categories, and constant objects
llvm::ArrayType *ClassListTy = llvm::ArrayType::get(PtrToInt8Ty,
Classes.size() + Categories.size() + 2);
llvm::StructType *SymTabTy = llvm::StructType::get(
LongTy,
SelectorTy,
llvm::Type::Int16Ty,
llvm::Type::Int16Ty,
ClassListTy,
NULL);
Elements.clear();
// Pointer to an array of selectors used in this module.
std::vector<llvm::Constant*> Selectors;
for (std::map<TypedSelector, llvm::GlobalAlias*>::iterator
iter = TypedSelectors.begin(), iterEnd = TypedSelectors.end();
iter != iterEnd ; ++iter) {
Elements.push_back(MakeConstantString((*iter).first.first,
".objc_sel_name"));
Elements.push_back(MakeConstantString((*iter).first.second,
".objc_sel_types"));
Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements));
Elements.clear();
}
for (llvm::StringMap<llvm::GlobalAlias*>::iterator
iter = UntypedSelectors.begin(), iterEnd = UntypedSelectors.end();
iter != iterEnd; iter++) {
Elements.push_back(
MakeConstantString((*iter).getKeyData(), ".objc_sel_name"));
Elements.push_back(NULLPtr);
Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements));
Elements.clear();
}
Elements.push_back(NULLPtr);
Elements.push_back(NULLPtr);
Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements));
Elements.clear();
// Number of static selectors
Elements.push_back(llvm::ConstantInt::get(LongTy, Selectors.size() ));
llvm::Constant *SelectorList = MakeGlobal(
llvm::ArrayType::get(SelStructTy, Selectors.size()), Selectors,
".objc_selector_list");
Elements.push_back(llvm::ConstantExpr::getBitCast(SelectorList, SelectorTy));
// Now that all of the static selectors exist, create pointers to them.
int index = 0;
for (std::map<TypedSelector, llvm::GlobalAlias*>::iterator
iter=TypedSelectors.begin(), iterEnd =TypedSelectors.end();
iter != iterEnd; ++iter) {
llvm::Constant *Idxs[] = {Zeros[0],
llvm::ConstantInt::get(llvm::Type::Int32Ty, index++), Zeros[0]};
llvm::GlobalVariable *SelPtr = new llvm::GlobalVariable(SelectorTy, true,
llvm::GlobalValue::InternalLinkage,
llvm::ConstantExpr::getGetElementPtr(SelectorList, Idxs, 2),
".objc_sel_ptr", &TheModule);
(*iter).second->setAliasee(SelPtr);
}
for (llvm::StringMap<llvm::GlobalAlias*>::iterator
iter=UntypedSelectors.begin(), iterEnd = UntypedSelectors.end();
iter != iterEnd; iter++) {
llvm::Constant *Idxs[] = {Zeros[0],
llvm::ConstantInt::get(llvm::Type::Int32Ty, index++), Zeros[0]};
llvm::GlobalVariable *SelPtr = new llvm::GlobalVariable(SelectorTy, true,
llvm::GlobalValue::InternalLinkage,
llvm::ConstantExpr::getGetElementPtr(SelectorList, Idxs, 2),
".objc_sel_ptr", &TheModule);
(*iter).second->setAliasee(SelPtr);
}
// Number of classes defined.
Elements.push_back(llvm::ConstantInt::get(llvm::Type::Int16Ty,
Classes.size()));
// Number of categories defined
Elements.push_back(llvm::ConstantInt::get(llvm::Type::Int16Ty,
Categories.size()));
// Create an array of classes, then categories, then static object instances
Classes.insert(Classes.end(), Categories.begin(), Categories.end());
// NULL-terminated list of static object instances (mainly constant strings)
Classes.push_back(Statics);
Classes.push_back(NULLPtr);
llvm::Constant *ClassList = llvm::ConstantArray::get(ClassListTy, Classes);
Elements.push_back(ClassList);
// Construct the symbol table
llvm::Constant *SymTab= MakeGlobal(SymTabTy, Elements);
// The symbol table is contained in a module which has some version-checking
// constants
llvm::StructType * ModuleTy = llvm::StructType::get(LongTy, LongTy,
PtrToInt8Ty, llvm::PointerType::getUnqual(SymTabTy), NULL);
Elements.clear();
// Runtime version used for compatibility checking.
Elements.push_back(llvm::ConstantInt::get(LongTy, RuntimeVersion));
//FIXME: Should be sizeof(ModuleTy)
Elements.push_back(llvm::ConstantInt::get(LongTy, 16));
//FIXME: Should be the path to the file where this module was declared
Elements.push_back(NULLPtr);
Elements.push_back(SymTab);
llvm::Value *Module = MakeGlobal(ModuleTy, Elements);
// Create the load function calling the runtime entry point with the module
// structure
std::vector<const llvm::Type*> VoidArgs;
llvm::Function * LoadFunction = llvm::Function::Create(
llvm::FunctionType::get(llvm::Type::VoidTy, VoidArgs, false),
llvm::GlobalValue::InternalLinkage, ".objc_load_function",
&TheModule);
llvm::BasicBlock *EntryBB = llvm::BasicBlock::Create("entry", LoadFunction);
llvm::IRBuilder Builder;
Builder.SetInsertPoint(EntryBB);
llvm::Value *Register = TheModule.getOrInsertFunction("__objc_exec_class",
llvm::Type::VoidTy, llvm::PointerType::getUnqual(ModuleTy), NULL);
Builder.CreateCall(Register, Module);
Builder.CreateRetVoid();
return LoadFunction;
}
llvm::Function *CGObjCGNU::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) {
std::vector<const llvm::Type*> Args;
if (!ReturnTy->isFirstClassType() && ReturnTy != llvm::Type::VoidTy) {
Args.push_back(llvm::PointerType::getUnqual(ReturnTy));
ReturnTy = llvm::Type::VoidTy;
}
Args.push_back(SelfTy);
Args.push_back(SelectorTy);
Args.insert(Args.end(), ArgTy, ArgTy+ArgC);
llvm::FunctionType *MethodTy = llvm::FunctionType::get(ReturnTy,
Args,
isVarArg);
std::string FunctionName = SymbolNameForMethod(ClassName, CategoryName,
MethodName, isClassMethod);
llvm::Function *Method = llvm::Function::Create(MethodTy,
llvm::GlobalValue::InternalLinkage,
FunctionName,
&TheModule);
llvm::Function::arg_iterator AI = Method->arg_begin();
// Name the struct return argument.
// FIXME: This is probably the wrong test.
if (!ReturnTy->isFirstClassType() && ReturnTy != llvm::Type::VoidTy) {
AI->setName("agg.result");
++AI;
}
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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