static uint64_t LookupFieldBitOffset(CodeGen::CodeGenModule &CGM,
const ObjCInterfaceDecl *OID,
const ObjCImplementationDecl *ID,
const ObjCIvarDecl *Ivar) {
const ObjCInterfaceDecl *Container = Ivar->getContainingInterface();
// FIXME: We should eliminate the need to have ObjCImplementationDecl passed
// in here; it should never be necessary because that should be the lexical
// decl context for the ivar.
// If we know have an implementation (and the ivar is in it) then
// look up in the implementation layout.
const ASTRecordLayout *RL;
if (ID && ID->getClassInterface() == Container)
RL = &CGM.getContext().getASTObjCImplementationLayout(ID);
else
RL = &CGM.getContext().getASTObjCInterfaceLayout(Container);
// Compute field index.
//
// FIXME: The index here is closely tied to how ASTContext::getObjCLayout is
// implemented. This should be fixed to get the information from the layout
// directly.
unsigned Index = 0;
for (const ObjCIvarDecl *IVD = Container->all_declared_ivar_begin();
IVD; IVD = IVD->getNextIvar()) {
if (Ivar == IVD)
break;
++Index;
}
assert(Index < RL->getFieldCount() && "Ivar is not inside record layout!");
return RL->getFieldOffset(Index);
}
uint64_t CGObjCRuntime::ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM,
const ObjCImplementationDecl *OID,
const ObjCIvarDecl *Ivar) {
return LookupFieldBitOffset(CGM, OID->getClassInterface(), OID, Ivar) /
CGM.getContext().getCharWidth();
}
CGObjCJit::CGObjCJit(CodeGen::CodeGenModule &cgm)
: CGObjCRuntime(cgm),
isUsable(false),
CGM(cgm),
VMContext(cgm.getLLVMContext()),
ObjCTypes(cgm),
JitInitFunction(0) {
//puts("Constructing CGObjCJit (host runtime proxy)");
llvm::PointerType *PtrToInt8Ty =
llvm::Type::getInt8Ty(VMContext)->getPointerTo();
NULLPtr = llvm::ConstantPointerNull::get(PtrToInt8Ty);
// TODO: For now, just searching for pre-loaded objc runtime
LOAD_FN(_objc_getClass, "objc_getClass");
// Don't bother to try the rest if the first one wasn't available
if (_objc_getClass) {
isUsable = true;
LOAD_FN(_objc_allocateClassPair, "objc_allocateClassPair");
LOAD_FN(_objc_registerClassPair, "objc_registerClassPair");
LOAD_FN(_objc_getProtocol, "objc_getProtocol");
LOAD_FN(_object_getClass, "object_getClass");
LOAD_FN(_sel_registerName, "sel_registerName");
LOAD_FN(_class_getClassVariable, "class_getClassVariable");
LOAD_FN(_class_addIvar, "class_addIvar");
LOAD_FN(_class_addProtocol, "class_addProtocol");
LOAD_FN(_class_getMethodImplementation, "class_getMethodImplementation");
LOAD_FN(_ivar_getOffset, "ivar_getOffset");
LOAD_FN(_NSGetSizeAndAlignment, "NSGetSizeAndAlignment");
//puts("Creating .objc_jit_init()");
llvm::FunctionType *initFuncType =
llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), false);
JitInitFunction =
cast<llvm::Function>(CGM.getModule().getOrInsertFunction(
llvm::StringRef(".objc_jit_init"),
initFuncType));
JitInitFunction->setLinkage(llvm::Function::PrivateLinkage);
JitInitFunction->setCallingConv(llvm::CallingConv::C);
JitInitBlock =
llvm::BasicBlock::Create(VMContext, "entry", JitInitFunction);
// Define VM objc_getClass function
fn_objc_getClass.init(&CGM, "objc_getClass",
ObjCTypes.ClassPtrTy,
ObjCTypes.Int8PtrTy,
NULL);
fn_objc_getMetaClass.init(&CGM, "objc_getMetaClass",
ObjCTypes.ClassPtrTy,
ObjCTypes.Int8PtrTy,
NULL);
fn_objc_getProtocol.init(&CGM, "objc_getProtocol",
ObjCTypes.ProtocolPtrTy,
ObjCTypes.Int8PtrTy,
NULL);
fn_object_getClass.init(&CGM, "object_getClass",
ObjCTypes.ClassPtrTy,
ObjCTypes.ObjectPtrTy,
NULL);
// Define VM class_addMethod and class_replaceMethod function calls for
// the init function
llvm::Type *ImpParams[] = {ObjCTypes.ObjectPtrTy, ObjCTypes.SelectorPtrTy};
ImpPtrTy = llvm::FunctionType::get(ObjCTypes.ObjectPtrTy,
ImpParams,
false)->getPointerTo();
fn_class_addMethod.init(&CGM, "class_addMethod",
llvm::Type::getInt8Ty(VMContext),
ObjCTypes.ClassPtrTy,
ObjCTypes.SelectorPtrTy,
ImpPtrTy,
ObjCTypes.Int8PtrTy,
NULL);
fn_class_replaceMethod.init(&CGM, "class_replaceMethod",
llvm::Type::getInt8Ty(VMContext),
ObjCTypes.ClassTy,
ObjCTypes.SelectorPtrTy,
ImpPtrTy,
ObjCTypes.Int8PtrTy,
NULL);
fn_class_getMethodImplementation.init(&CGM, "class_getMethodImplementation",
ImpPtrTy,
ObjCTypes.ClassPtrTy,
ObjCTypes.SelectorPtrTy,
NULL);
// Unfortunately, even though class_getMethodImplementation is provided by
// the GNU runtime, it doesn't work on a class unless objc_msg_lookup was
// called first.
//
LOAD_FN(_objc_msg_lookup, "objc_msg_lookup");
if (_objc_msg_lookup) {
fn_objc_msg_lookup.init(&CGM, "objc_msg_lookup",
ImpPtrTy,
ObjCTypes.ClassPtrTy,
ObjCTypes.SelectorPtrTy,
NULL);
}
// Save 'isa' pointer value used for locally-stored prototypes
void *sampleProtocol = _objc_getProtocol("NSObject");
ProtocolIsaPointer = *((void**)sampleProtocol);
InitConstantStringGenerator();
}
}
uint64_t CGObjCRuntime::ComputeIvarBaseOffset(CodeGen::CodeGenModule &CGM,
const ObjCInterfaceDecl *OID,
const ObjCIvarDecl *Ivar) {
return LookupFieldBitOffset(CGM, OID, nullptr, Ivar) /
CGM.getContext().getCharWidth();
}