1193326Sed//===------- CGObjCGNU.cpp - Emit LLVM Code from ASTs for a Module --------===// 2193326Sed// 3193326Sed// The LLVM Compiler Infrastructure 4193326Sed// 5193326Sed// This file is distributed under the University of Illinois Open Source 6193326Sed// License. See LICENSE.TXT for details. 7193326Sed// 8193326Sed//===----------------------------------------------------------------------===// 9193326Sed// 10221345Sdim// This provides Objective-C code generation targeting the GNU runtime. The 11193326Sed// class in this file generates structures used by the GNU Objective-C runtime 12193326Sed// library. These structures are defined in objc/objc.h and objc/objc-api.h in 13193326Sed// the GNU runtime distribution. 14193326Sed// 15193326Sed//===----------------------------------------------------------------------===// 16193326Sed 17193326Sed#include "CGObjCRuntime.h" 18249423Sdim#include "CGCleanup.h" 19249423Sdim#include "CodeGenFunction.h" 20193326Sed#include "CodeGenModule.h" 21193326Sed#include "clang/AST/ASTContext.h" 22193326Sed#include "clang/AST/Decl.h" 23193326Sed#include "clang/AST/DeclObjC.h" 24193326Sed#include "clang/AST/RecordLayout.h" 25193326Sed#include "clang/AST/StmtObjC.h" 26249423Sdim#include "clang/Basic/FileManager.h" 27221345Sdim#include "clang/Basic/SourceManager.h" 28193326Sed#include "llvm/ADT/SmallVector.h" 29193326Sed#include "llvm/ADT/StringMap.h" 30276479Sdim#include "llvm/IR/CallSite.h" 31249423Sdim#include "llvm/IR/DataLayout.h" 32249423Sdim#include "llvm/IR/Intrinsics.h" 33249423Sdim#include "llvm/IR/LLVMContext.h" 34249423Sdim#include "llvm/IR/Module.h" 35193326Sed#include "llvm/Support/Compiler.h" 36226633Sdim#include <cstdarg> 37193326Sed 38193326Sed 39193326Sedusing namespace clang; 40193326Sedusing namespace CodeGen; 41193326Sed 42193326Sed 43193326Sednamespace { 44221345Sdim/// Class that lazily initialises the runtime function. Avoids inserting the 45221345Sdim/// types and the function declaration into a module if they're not used, and 46221345Sdim/// avoids constructing the type more than once if it's used more than once. 47221345Sdimclass LazyRuntimeFunction { 48221345Sdim CodeGenModule *CGM; 49288943Sdim llvm::FunctionType *FTy; 50221345Sdim const char *FunctionName; 51223017Sdim llvm::Constant *Function; 52288943Sdim 53288943Sdimpublic: 54288943Sdim /// Constructor leaves this class uninitialized, because it is intended to 55288943Sdim /// be used as a field in another class and not all of the types that are 56288943Sdim /// used as arguments will necessarily be available at construction time. 57288943Sdim LazyRuntimeFunction() 58276479Sdim : CGM(nullptr), FunctionName(nullptr), Function(nullptr) {} 59221345Sdim 60288943Sdim /// Initialises the lazy function with the name, return type, and the types 61288943Sdim /// of the arguments. 62288943Sdim LLVM_END_WITH_NULL 63288943Sdim void init(CodeGenModule *Mod, const char *name, llvm::Type *RetTy, ...) { 64288943Sdim CGM = Mod; 65288943Sdim FunctionName = name; 66288943Sdim Function = nullptr; 67288943Sdim std::vector<llvm::Type *> ArgTys; 68288943Sdim va_list Args; 69288943Sdim va_start(Args, RetTy); 70288943Sdim while (llvm::Type *ArgTy = va_arg(Args, llvm::Type *)) 71288943Sdim ArgTys.push_back(ArgTy); 72288943Sdim va_end(Args); 73288943Sdim FTy = llvm::FunctionType::get(RetTy, ArgTys, false); 74288943Sdim } 75223017Sdim 76288943Sdim llvm::FunctionType *getType() { return FTy; } 77288943Sdim 78288943Sdim /// Overloaded cast operator, allows the class to be implicitly cast to an 79288943Sdim /// LLVM constant. 80288943Sdim operator llvm::Constant *() { 81288943Sdim if (!Function) { 82288943Sdim if (!FunctionName) 83288943Sdim return nullptr; 84288943Sdim Function = 85288943Sdim cast<llvm::Constant>(CGM->CreateRuntimeFunction(FTy, FunctionName)); 86288943Sdim } 87288943Sdim return Function; 88288943Sdim } 89288943Sdim operator llvm::Function *() { 90288943Sdim return cast<llvm::Function>((llvm::Constant *)*this); 91288943Sdim } 92221345Sdim}; 93221345Sdim 94221345Sdim 95221345Sdim/// GNU Objective-C runtime code generation. This class implements the parts of 96239462Sdim/// Objective-C support that are specific to the GNU family of runtimes (GCC, 97239462Sdim/// GNUstep and ObjFW). 98221345Sdimclass CGObjCGNU : public CGObjCRuntime { 99221345Sdimprotected: 100221345Sdim /// The LLVM module into which output is inserted 101193326Sed llvm::Module &TheModule; 102221345Sdim /// strut objc_super. Used for sending messages to super. This structure 103221345Sdim /// contains the receiver (object) and the expected class. 104226633Sdim llvm::StructType *ObjCSuperTy; 105221345Sdim /// struct objc_super*. The type of the argument to the superclass message 106221345Sdim /// lookup functions. 107226633Sdim llvm::PointerType *PtrToObjCSuperTy; 108221345Sdim /// LLVM type for selectors. Opaque pointer (i8*) unless a header declaring 109221345Sdim /// SEL is included in a header somewhere, in which case it will be whatever 110221345Sdim /// type is declared in that header, most likely {i8*, i8*}. 111224145Sdim llvm::PointerType *SelectorTy; 112221345Sdim /// LLVM i8 type. Cached here to avoid repeatedly getting it in all of the 113221345Sdim /// places where it's used 114226633Sdim llvm::IntegerType *Int8Ty; 115221345Sdim /// Pointer to i8 - LLVM type of char*, for all of the places where the 116221345Sdim /// runtime needs to deal with C strings. 117224145Sdim llvm::PointerType *PtrToInt8Ty; 118221345Sdim /// Instance Method Pointer type. This is a pointer to a function that takes, 119221345Sdim /// at a minimum, an object and a selector, and is the generic type for 120221345Sdim /// Objective-C methods. Due to differences between variadic / non-variadic 121221345Sdim /// calling conventions, it must always be cast to the correct type before 122221345Sdim /// actually being used. 123224145Sdim llvm::PointerType *IMPTy; 124221345Sdim /// Type of an untyped Objective-C object. Clang treats id as a built-in type 125221345Sdim /// when compiling Objective-C code, so this may be an opaque pointer (i8*), 126221345Sdim /// but if the runtime header declaring it is included then it may be a 127221345Sdim /// pointer to a structure. 128224145Sdim llvm::PointerType *IdTy; 129221345Sdim /// Pointer to a pointer to an Objective-C object. Used in the new ABI 130221345Sdim /// message lookup function and some GC-related functions. 131226633Sdim llvm::PointerType *PtrToIdTy; 132221345Sdim /// The clang type of id. Used when using the clang CGCall infrastructure to 133221345Sdim /// call Objective-C methods. 134204643Srdivacky CanQualType ASTIdTy; 135221345Sdim /// LLVM type for C int type. 136224145Sdim llvm::IntegerType *IntTy; 137221345Sdim /// LLVM type for an opaque pointer. This is identical to PtrToInt8Ty, but is 138221345Sdim /// used in the code to document the difference between i8* meaning a pointer 139221345Sdim /// to a C string and i8* meaning a pointer to some opaque type. 140224145Sdim llvm::PointerType *PtrTy; 141221345Sdim /// LLVM type for C long type. The runtime uses this in a lot of places where 142221345Sdim /// it should be using intptr_t, but we can't fix this without breaking 143221345Sdim /// compatibility with GCC... 144224145Sdim llvm::IntegerType *LongTy; 145221345Sdim /// LLVM type for C size_t. Used in various runtime data structures. 146226633Sdim llvm::IntegerType *SizeTy; 147226633Sdim /// LLVM type for C intptr_t. 148226633Sdim llvm::IntegerType *IntPtrTy; 149221345Sdim /// LLVM type for C ptrdiff_t. Mainly used in property accessor functions. 150226633Sdim llvm::IntegerType *PtrDiffTy; 151221345Sdim /// LLVM type for C int*. Used for GCC-ABI-compatible non-fragile instance 152221345Sdim /// variables. 153226633Sdim llvm::PointerType *PtrToIntTy; 154221345Sdim /// LLVM type for Objective-C BOOL type. 155226633Sdim llvm::Type *BoolTy; 156226633Sdim /// 32-bit integer type, to save us needing to look it up every time it's used. 157226633Sdim llvm::IntegerType *Int32Ty; 158226633Sdim /// 64-bit integer type, to save us needing to look it up every time it's used. 159226633Sdim llvm::IntegerType *Int64Ty; 160221345Sdim /// Metadata kind used to tie method lookups to message sends. The GNUstep 161221345Sdim /// runtime provides some LLVM passes that can use this to do things like 162221345Sdim /// automatic IMP caching and speculative inlining. 163221345Sdim unsigned msgSendMDKind; 164221345Sdim /// Helper function that generates a constant string and returns a pointer to 165221345Sdim /// the start of the string. The result of this function can be used anywhere 166221345Sdim /// where the C code specifies const char*. 167221345Sdim llvm::Constant *MakeConstantString(const std::string &Str, 168221345Sdim const std::string &Name="") { 169296417Sdim ConstantAddress Array = CGM.GetAddrOfConstantCString(Str, Name.c_str()); 170296417Sdim return llvm::ConstantExpr::getGetElementPtr(Array.getElementType(), 171296417Sdim Array.getPointer(), Zeros); 172221345Sdim } 173221345Sdim /// Emits a linkonce_odr string, whose name is the prefix followed by the 174221345Sdim /// string value. This allows the linker to combine the strings between 175221345Sdim /// different modules. Used for EH typeinfo names, selector strings, and a 176221345Sdim /// few other things. 177221345Sdim llvm::Constant *ExportUniqueString(const std::string &Str, 178221345Sdim const std::string prefix) { 179221345Sdim std::string name = prefix + Str; 180288943Sdim auto *ConstStr = TheModule.getGlobalVariable(name); 181221345Sdim if (!ConstStr) { 182234353Sdim llvm::Constant *value = llvm::ConstantDataArray::getString(VMContext,Str); 183221345Sdim ConstStr = new llvm::GlobalVariable(TheModule, value->getType(), true, 184221345Sdim llvm::GlobalValue::LinkOnceODRLinkage, value, prefix + Str); 185221345Sdim } 186288943Sdim return llvm::ConstantExpr::getGetElementPtr(ConstStr->getValueType(), 187288943Sdim ConstStr, Zeros); 188221345Sdim } 189221345Sdim /// Generates a global structure, initialized by the elements in the vector. 190221345Sdim /// The element types must match the types of the structure elements in the 191221345Sdim /// first argument. 192226633Sdim llvm::GlobalVariable *MakeGlobal(llvm::StructType *Ty, 193249423Sdim ArrayRef<llvm::Constant *> V, 194296417Sdim CharUnits Align, 195226633Sdim StringRef Name="", 196221345Sdim llvm::GlobalValue::LinkageTypes linkage 197221345Sdim =llvm::GlobalValue::InternalLinkage) { 198221345Sdim llvm::Constant *C = llvm::ConstantStruct::get(Ty, V); 199296417Sdim auto GV = new llvm::GlobalVariable(TheModule, Ty, false, 200296417Sdim linkage, C, Name); 201296417Sdim GV->setAlignment(Align.getQuantity()); 202296417Sdim return GV; 203221345Sdim } 204221345Sdim /// Generates a global array. The vector must contain the same number of 205221345Sdim /// elements that the array type declares, of the type specified as the array 206221345Sdim /// element type. 207226633Sdim llvm::GlobalVariable *MakeGlobal(llvm::ArrayType *Ty, 208249423Sdim ArrayRef<llvm::Constant *> V, 209296417Sdim CharUnits Align, 210226633Sdim StringRef Name="", 211221345Sdim llvm::GlobalValue::LinkageTypes linkage 212221345Sdim =llvm::GlobalValue::InternalLinkage) { 213221345Sdim llvm::Constant *C = llvm::ConstantArray::get(Ty, V); 214296417Sdim auto GV = new llvm::GlobalVariable(TheModule, Ty, false, 215296417Sdim linkage, C, Name); 216296417Sdim GV->setAlignment(Align.getQuantity()); 217296417Sdim return GV; 218221345Sdim } 219221345Sdim /// Generates a global array, inferring the array type from the specified 220221345Sdim /// element type and the size of the initialiser. 221226633Sdim llvm::GlobalVariable *MakeGlobalArray(llvm::Type *Ty, 222249423Sdim ArrayRef<llvm::Constant *> V, 223296417Sdim CharUnits Align, 224226633Sdim StringRef Name="", 225221345Sdim llvm::GlobalValue::LinkageTypes linkage 226221345Sdim =llvm::GlobalValue::InternalLinkage) { 227221345Sdim llvm::ArrayType *ArrayTy = llvm::ArrayType::get(Ty, V.size()); 228296417Sdim return MakeGlobal(ArrayTy, V, Align, Name, linkage); 229221345Sdim } 230243830Sdim /// Returns a property name and encoding string. 231243830Sdim llvm::Constant *MakePropertyEncodingString(const ObjCPropertyDecl *PD, 232243830Sdim const Decl *Container) { 233249423Sdim const ObjCRuntime &R = CGM.getLangOpts().ObjCRuntime; 234243830Sdim if ((R.getKind() == ObjCRuntime::GNUstep) && 235243830Sdim (R.getVersion() >= VersionTuple(1, 6))) { 236243830Sdim std::string NameAndAttributes; 237243830Sdim std::string TypeStr; 238243830Sdim CGM.getContext().getObjCEncodingForPropertyDecl(PD, Container, TypeStr); 239243830Sdim NameAndAttributes += '\0'; 240243830Sdim NameAndAttributes += TypeStr.length() + 3; 241243830Sdim NameAndAttributes += TypeStr; 242243830Sdim NameAndAttributes += '\0'; 243243830Sdim NameAndAttributes += PD->getNameAsString(); 244296417Sdim return MakeConstantString(NameAndAttributes); 245243830Sdim } 246243830Sdim return MakeConstantString(PD->getNameAsString()); 247243830Sdim } 248249423Sdim /// Push the property attributes into two structure fields. 249249423Sdim void PushPropertyAttributes(std::vector<llvm::Constant*> &Fields, 250249423Sdim ObjCPropertyDecl *property, bool isSynthesized=true, bool 251249423Sdim isDynamic=true) { 252249423Sdim int attrs = property->getPropertyAttributes(); 253249423Sdim // For read-only properties, clear the copy and retain flags 254249423Sdim if (attrs & ObjCPropertyDecl::OBJC_PR_readonly) { 255249423Sdim attrs &= ~ObjCPropertyDecl::OBJC_PR_copy; 256249423Sdim attrs &= ~ObjCPropertyDecl::OBJC_PR_retain; 257249423Sdim attrs &= ~ObjCPropertyDecl::OBJC_PR_weak; 258249423Sdim attrs &= ~ObjCPropertyDecl::OBJC_PR_strong; 259249423Sdim } 260249423Sdim // The first flags field has the same attribute values as clang uses internally 261249423Sdim Fields.push_back(llvm::ConstantInt::get(Int8Ty, attrs & 0xff)); 262249423Sdim attrs >>= 8; 263249423Sdim attrs <<= 2; 264249423Sdim // For protocol properties, synthesized and dynamic have no meaning, so we 265249423Sdim // reuse these flags to indicate that this is a protocol property (both set 266249423Sdim // has no meaning, as a property can't be both synthesized and dynamic) 267249423Sdim attrs |= isSynthesized ? (1<<0) : 0; 268249423Sdim attrs |= isDynamic ? (1<<1) : 0; 269249423Sdim // The second field is the next four fields left shifted by two, with the 270249423Sdim // low bit set to indicate whether the field is synthesized or dynamic. 271249423Sdim Fields.push_back(llvm::ConstantInt::get(Int8Ty, attrs & 0xff)); 272249423Sdim // Two padding fields 273249423Sdim Fields.push_back(llvm::ConstantInt::get(Int8Ty, 0)); 274249423Sdim Fields.push_back(llvm::ConstantInt::get(Int8Ty, 0)); 275249423Sdim } 276221345Sdim /// Ensures that the value has the required type, by inserting a bitcast if 277221345Sdim /// required. This function lets us avoid inserting bitcasts that are 278221345Sdim /// redundant. 279249423Sdim llvm::Value* EnforceType(CGBuilderTy &B, llvm::Value *V, llvm::Type *Ty) { 280221345Sdim if (V->getType() == Ty) return V; 281221345Sdim return B.CreateBitCast(V, Ty); 282221345Sdim } 283296417Sdim Address EnforceType(CGBuilderTy &B, Address V, llvm::Type *Ty) { 284296417Sdim if (V.getType() == Ty) return V; 285296417Sdim return B.CreateBitCast(V, Ty); 286296417Sdim } 287221345Sdim // Some zeros used for GEPs in lots of places. 288221345Sdim llvm::Constant *Zeros[2]; 289221345Sdim /// Null pointer value. Mainly used as a terminator in various arrays. 290221345Sdim llvm::Constant *NULLPtr; 291221345Sdim /// LLVM context. 292221345Sdim llvm::LLVMContext &VMContext; 293221345Sdimprivate: 294221345Sdim /// Placeholder for the class. Lots of things refer to the class before we've 295221345Sdim /// actually emitted it. We use this alias as a placeholder, and then replace 296221345Sdim /// it with a pointer to the class structure before finally emitting the 297221345Sdim /// module. 298193326Sed llvm::GlobalAlias *ClassPtrAlias; 299221345Sdim /// Placeholder for the metaclass. Lots of things refer to the class before 300221345Sdim /// we've / actually emitted it. We use this alias as a placeholder, and then 301221345Sdim /// replace / it with a pointer to the metaclass structure before finally 302221345Sdim /// emitting the / module. 303193326Sed llvm::GlobalAlias *MetaClassPtrAlias; 304221345Sdim /// All of the classes that have been generated for this compilation units. 305193326Sed std::vector<llvm::Constant*> Classes; 306221345Sdim /// All of the categories that have been generated for this compilation units. 307193326Sed std::vector<llvm::Constant*> Categories; 308221345Sdim /// All of the Objective-C constant strings that have been generated for this 309221345Sdim /// compilation units. 310193326Sed std::vector<llvm::Constant*> ConstantStrings; 311221345Sdim /// Map from string values to Objective-C constant strings in the output. 312221345Sdim /// Used to prevent emitting Objective-C strings more than once. This should 313221345Sdim /// not be required at all - CodeGenModule should manage this list. 314203955Srdivacky llvm::StringMap<llvm::Constant*> ObjCStrings; 315221345Sdim /// All of the protocols that have been declared. 316193326Sed llvm::StringMap<llvm::Constant*> ExistingProtocols; 317221345Sdim /// For each variant of a selector, we store the type encoding and a 318221345Sdim /// placeholder value. For an untyped selector, the type will be the empty 319221345Sdim /// string. Selector references are all done via the module's selector table, 320221345Sdim /// so we create an alias as a placeholder and then replace it with the real 321221345Sdim /// value later. 322221345Sdim typedef std::pair<std::string, llvm::GlobalAlias*> TypedSelector; 323221345Sdim /// Type of the selector map. This is roughly equivalent to the structure 324221345Sdim /// used in the GNUstep runtime, which maintains a list of all of the valid 325221345Sdim /// types for a selector in a table. 326226633Sdim typedef llvm::DenseMap<Selector, SmallVector<TypedSelector, 2> > 327221345Sdim SelectorMap; 328221345Sdim /// A map from selectors to selector types. This allows us to emit all 329221345Sdim /// selectors of the same name and type together. 330221345Sdim SelectorMap SelectorTable; 331221345Sdim 332221345Sdim /// Selectors related to memory management. When compiling in GC mode, we 333221345Sdim /// omit these. 334203955Srdivacky Selector RetainSel, ReleaseSel, AutoreleaseSel; 335221345Sdim /// Runtime functions used for memory management in GC mode. Note that clang 336221345Sdim /// supports code generation for calling these functions, but neither GNU 337221345Sdim /// runtime actually supports this API properly yet. 338221345Sdim LazyRuntimeFunction IvarAssignFn, StrongCastAssignFn, MemMoveFn, WeakReadFn, 339221345Sdim WeakAssignFn, GlobalAssignFn; 340221345Sdim 341234353Sdim typedef std::pair<std::string, std::string> ClassAliasPair; 342234353Sdim /// All classes that have aliases set for them. 343234353Sdim std::vector<ClassAliasPair> ClassAliases; 344234353Sdim 345221345Sdimprotected: 346221345Sdim /// Function used for throwing Objective-C exceptions. 347221345Sdim LazyRuntimeFunction ExceptionThrowFn; 348239462Sdim /// Function used for rethrowing exceptions, used at the end of \@finally or 349239462Sdim /// \@synchronize blocks. 350221345Sdim LazyRuntimeFunction ExceptionReThrowFn; 351221345Sdim /// Function called when entering a catch function. This is required for 352221345Sdim /// differentiating Objective-C exceptions and foreign exceptions. 353221345Sdim LazyRuntimeFunction EnterCatchFn; 354221345Sdim /// Function called when exiting from a catch block. Used to do exception 355221345Sdim /// cleanup. 356221345Sdim LazyRuntimeFunction ExitCatchFn; 357239462Sdim /// Function called when entering an \@synchronize block. Acquires the lock. 358221345Sdim LazyRuntimeFunction SyncEnterFn; 359239462Sdim /// Function called when exiting an \@synchronize block. Releases the lock. 360221345Sdim LazyRuntimeFunction SyncExitFn; 361221345Sdim 362193326Sedprivate: 363221345Sdim 364221345Sdim /// Function called if fast enumeration detects that the collection is 365221345Sdim /// modified during the update. 366221345Sdim LazyRuntimeFunction EnumerationMutationFn; 367221345Sdim /// Function for implementing synthesized property getters that return an 368221345Sdim /// object. 369221345Sdim LazyRuntimeFunction GetPropertyFn; 370221345Sdim /// Function for implementing synthesized property setters that return an 371221345Sdim /// object. 372221345Sdim LazyRuntimeFunction SetPropertyFn; 373221345Sdim /// Function used for non-object declared property getters. 374221345Sdim LazyRuntimeFunction GetStructPropertyFn; 375221345Sdim /// Function used for non-object declared property setters. 376221345Sdim LazyRuntimeFunction SetStructPropertyFn; 377221345Sdim 378221345Sdim /// The version of the runtime that this class targets. Must match the 379221345Sdim /// version in the runtime. 380223017Sdim int RuntimeVersion; 381221345Sdim /// The version of the protocol class. Used to differentiate between ObjC1 382221345Sdim /// and ObjC2 protocols. Objective-C 1 protocols can not contain optional 383221345Sdim /// components and can not contain declared properties. We always emit 384221345Sdim /// Objective-C 2 property structures, but we have to pretend that they're 385221345Sdim /// Objective-C 1 property structures when targeting the GCC runtime or it 386221345Sdim /// will abort. 387221345Sdim const int ProtocolVersion; 388221345Sdimprivate: 389221345Sdim /// Generates an instance variable list structure. This is a structure 390221345Sdim /// containing a size and an array of structures containing instance variable 391221345Sdim /// metadata. This is used purely for introspection in the fragile ABI. In 392221345Sdim /// the non-fragile ABI, it's used for instance variable fixup. 393234353Sdim llvm::Constant *GenerateIvarList(ArrayRef<llvm::Constant *> IvarNames, 394234353Sdim ArrayRef<llvm::Constant *> IvarTypes, 395234353Sdim ArrayRef<llvm::Constant *> IvarOffsets); 396221345Sdim /// Generates a method list structure. This is a structure containing a size 397221345Sdim /// and an array of structures containing method metadata. 398221345Sdim /// 399221345Sdim /// This structure is used by both classes and categories, and contains a next 400221345Sdim /// pointer allowing them to be chained together in a linked list. 401280031Sdim llvm::Constant *GenerateMethodList(StringRef ClassName, 402280031Sdim StringRef CategoryName, 403234353Sdim ArrayRef<Selector> MethodSels, 404234353Sdim ArrayRef<llvm::Constant *> MethodTypes, 405193326Sed bool isClassMethodList); 406239462Sdim /// Emits an empty protocol. This is used for \@protocol() where no protocol 407221345Sdim /// is found. The runtime will (hopefully) fix up the pointer to refer to the 408221345Sdim /// real protocol. 409193326Sed llvm::Constant *GenerateEmptyProtocol(const std::string &ProtocolName); 410221345Sdim /// Generates a list of property metadata structures. This follows the same 411221345Sdim /// pattern as method and instance variable metadata lists. 412198092Srdivacky llvm::Constant *GeneratePropertyList(const ObjCImplementationDecl *OID, 413226633Sdim SmallVectorImpl<Selector> &InstanceMethodSels, 414226633Sdim SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes); 415221345Sdim /// Generates a list of referenced protocols. Classes, categories, and 416221345Sdim /// protocols all use this structure. 417234353Sdim llvm::Constant *GenerateProtocolList(ArrayRef<std::string> Protocols); 418221345Sdim /// To ensure that all protocols are seen by the runtime, we add a category on 419221345Sdim /// a class defined in the runtime, declaring no methods, but adopting the 420221345Sdim /// protocols. This is a horribly ugly hack, but it allows us to collect all 421221345Sdim /// of the protocols without changing the ABI. 422249423Sdim void GenerateProtocolHolderCategory(); 423221345Sdim /// Generates a class structure. 424193326Sed llvm::Constant *GenerateClassStructure( 425193326Sed llvm::Constant *MetaClass, 426193326Sed llvm::Constant *SuperClass, 427193326Sed unsigned info, 428193326Sed const char *Name, 429193326Sed llvm::Constant *Version, 430193326Sed llvm::Constant *InstanceSize, 431193326Sed llvm::Constant *IVars, 432193326Sed llvm::Constant *Methods, 433198092Srdivacky llvm::Constant *Protocols, 434198092Srdivacky llvm::Constant *IvarOffsets, 435207619Srdivacky llvm::Constant *Properties, 436226633Sdim llvm::Constant *StrongIvarBitmap, 437226633Sdim llvm::Constant *WeakIvarBitmap, 438207619Srdivacky bool isMeta=false); 439221345Sdim /// Generates a method list. This is used by protocols to define the required 440221345Sdim /// and optional methods. 441193326Sed llvm::Constant *GenerateProtocolMethodList( 442234353Sdim ArrayRef<llvm::Constant *> MethodNames, 443234353Sdim ArrayRef<llvm::Constant *> MethodTypes); 444221345Sdim /// Returns a selector with the specified type encoding. An empty string is 445221345Sdim /// used to return an untyped selector (with the types field set to NULL). 446249423Sdim llvm::Value *GetSelector(CodeGenFunction &CGF, Selector Sel, 447296417Sdim const std::string &TypeEncoding); 448221345Sdim /// Returns the variable used to store the offset of an instance variable. 449193326Sed llvm::GlobalVariable *ObjCIvarOffsetVariable(const ObjCInterfaceDecl *ID, 450193326Sed const ObjCIvarDecl *Ivar); 451221345Sdim /// Emits a reference to a class. This allows the linker to object if there 452221345Sdim /// is no class of the matching name. 453239462Sdimprotected: 454194613Sed void EmitClassRef(const std::string &className); 455224145Sdim /// Emits a pointer to the named class 456249423Sdim virtual llvm::Value *GetClassNamed(CodeGenFunction &CGF, 457239462Sdim const std::string &Name, bool isWeak); 458221345Sdim /// Looks up the method for sending a message to the specified object. This 459221345Sdim /// mechanism differs between the GCC and GNU runtimes, so this method must be 460221345Sdim /// overridden in subclasses. 461221345Sdim virtual llvm::Value *LookupIMP(CodeGenFunction &CGF, 462221345Sdim llvm::Value *&Receiver, 463221345Sdim llvm::Value *cmd, 464261991Sdim llvm::MDNode *node, 465261991Sdim MessageSendInfo &MSI) = 0; 466226633Sdim /// Looks up the method for sending a message to a superclass. This 467226633Sdim /// mechanism differs between the GCC and GNU runtimes, so this method must 468226633Sdim /// be overridden in subclasses. 469221345Sdim virtual llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, 470296417Sdim Address ObjCSuper, 471261991Sdim llvm::Value *cmd, 472261991Sdim MessageSendInfo &MSI) = 0; 473226633Sdim /// Libobjc2 uses a bitfield representation where small(ish) bitfields are 474226633Sdim /// stored in a 64-bit value with the low bit set to 1 and the remaining 63 475226633Sdim /// bits set to their values, LSB first, while larger ones are stored in a 476226633Sdim /// structure of this / form: 477226633Sdim /// 478226633Sdim /// struct { int32_t length; int32_t values[length]; }; 479226633Sdim /// 480226633Sdim /// The values in the array are stored in host-endian format, with the least 481226633Sdim /// significant bit being assumed to come first in the bitfield. Therefore, 482226633Sdim /// a bitfield with the 64th bit set will be (int64_t)&{ 2, [0, 1<<31] }, 483226633Sdim /// while a bitfield / with the 63rd bit set will be 1<<64. 484234353Sdim llvm::Constant *MakeBitField(ArrayRef<bool> bits); 485193326Sedpublic: 486221345Sdim CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion, 487221345Sdim unsigned protocolClassVersion); 488221345Sdim 489296417Sdim ConstantAddress GenerateConstantString(const StringLiteral *) override; 490221345Sdim 491276479Sdim RValue 492276479Sdim GenerateMessageSend(CodeGenFunction &CGF, ReturnValueSlot Return, 493276479Sdim QualType ResultType, Selector Sel, 494276479Sdim llvm::Value *Receiver, const CallArgList &CallArgs, 495207619Srdivacky const ObjCInterfaceDecl *Class, 496276479Sdim const ObjCMethodDecl *Method) override; 497276479Sdim RValue 498276479Sdim GenerateMessageSendSuper(CodeGenFunction &CGF, ReturnValueSlot Return, 499276479Sdim QualType ResultType, Selector Sel, 500193326Sed const ObjCInterfaceDecl *Class, 501276479Sdim bool isCategoryImpl, llvm::Value *Receiver, 502276479Sdim bool IsClassMessage, const CallArgList &CallArgs, 503276479Sdim const ObjCMethodDecl *Method) override; 504276479Sdim llvm::Value *GetClass(CodeGenFunction &CGF, 505276479Sdim const ObjCInterfaceDecl *OID) override; 506296417Sdim llvm::Value *GetSelector(CodeGenFunction &CGF, Selector Sel) override; 507296417Sdim Address GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) override; 508276479Sdim llvm::Value *GetSelector(CodeGenFunction &CGF, 509276479Sdim const ObjCMethodDecl *Method) override; 510276479Sdim llvm::Constant *GetEHType(QualType T) override; 511198092Srdivacky 512276479Sdim llvm::Function *GenerateMethod(const ObjCMethodDecl *OMD, 513276479Sdim const ObjCContainerDecl *CD) override; 514276479Sdim void GenerateCategory(const ObjCCategoryImplDecl *CMD) override; 515276479Sdim void GenerateClass(const ObjCImplementationDecl *ClassDecl) override; 516276479Sdim void RegisterAlias(const ObjCCompatibleAliasDecl *OAD) override; 517276479Sdim llvm::Value *GenerateProtocolRef(CodeGenFunction &CGF, 518276479Sdim const ObjCProtocolDecl *PD) override; 519276479Sdim void GenerateProtocol(const ObjCProtocolDecl *PD) override; 520276479Sdim llvm::Function *ModuleInitFunction() override; 521276479Sdim llvm::Constant *GetPropertyGetFunction() override; 522276479Sdim llvm::Constant *GetPropertySetFunction() override; 523276479Sdim llvm::Constant *GetOptimizedPropertySetFunction(bool atomic, 524276479Sdim bool copy) override; 525276479Sdim llvm::Constant *GetSetStructFunction() override; 526276479Sdim llvm::Constant *GetGetStructFunction() override; 527276479Sdim llvm::Constant *GetCppAtomicObjectGetFunction() override; 528276479Sdim llvm::Constant *GetCppAtomicObjectSetFunction() override; 529276479Sdim llvm::Constant *EnumerationMutationFunction() override; 530198092Srdivacky 531276479Sdim void EmitTryStmt(CodeGenFunction &CGF, 532276479Sdim const ObjCAtTryStmt &S) override; 533276479Sdim void EmitSynchronizedStmt(CodeGenFunction &CGF, 534276479Sdim const ObjCAtSynchronizedStmt &S) override; 535276479Sdim void EmitThrowStmt(CodeGenFunction &CGF, 536276479Sdim const ObjCAtThrowStmt &S, 537276479Sdim bool ClearInsertionPoint=true) override; 538276479Sdim llvm::Value * EmitObjCWeakRead(CodeGenFunction &CGF, 539296417Sdim Address AddrWeakObj) override; 540276479Sdim void EmitObjCWeakAssign(CodeGenFunction &CGF, 541296417Sdim llvm::Value *src, Address dst) override; 542276479Sdim void EmitObjCGlobalAssign(CodeGenFunction &CGF, 543296417Sdim llvm::Value *src, Address dest, 544276479Sdim bool threadlocal=false) override; 545276479Sdim void EmitObjCIvarAssign(CodeGenFunction &CGF, llvm::Value *src, 546296417Sdim Address dest, llvm::Value *ivarOffset) override; 547276479Sdim void EmitObjCStrongCastAssign(CodeGenFunction &CGF, 548296417Sdim llvm::Value *src, Address dest) override; 549296417Sdim void EmitGCMemmoveCollectable(CodeGenFunction &CGF, Address DestPtr, 550296417Sdim Address SrcPtr, 551276479Sdim llvm::Value *Size) override; 552276479Sdim LValue EmitObjCValueForIvar(CodeGenFunction &CGF, QualType ObjectTy, 553276479Sdim llvm::Value *BaseValue, const ObjCIvarDecl *Ivar, 554276479Sdim unsigned CVRQualifiers) override; 555276479Sdim llvm::Value *EmitIvarOffset(CodeGenFunction &CGF, 556276479Sdim const ObjCInterfaceDecl *Interface, 557276479Sdim const ObjCIvarDecl *Ivar) override; 558276479Sdim llvm::Value *EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) override; 559276479Sdim llvm::Constant *BuildGCBlockLayout(CodeGenModule &CGM, 560276479Sdim const CGBlockInfo &blockInfo) override { 561212904Sdim return NULLPtr; 562212904Sdim } 563276479Sdim llvm::Constant *BuildRCBlockLayout(CodeGenModule &CGM, 564276479Sdim const CGBlockInfo &blockInfo) override { 565243830Sdim return NULLPtr; 566243830Sdim } 567276479Sdim 568276479Sdim llvm::Constant *BuildByrefLayout(CodeGenModule &CGM, QualType T) override { 569249423Sdim return NULLPtr; 570249423Sdim } 571276479Sdim 572276479Sdim llvm::GlobalVariable *GetClassGlobal(const std::string &Name, 573276479Sdim bool Weak = false) override { 574276479Sdim return nullptr; 575223017Sdim } 576193326Sed}; 577221345Sdim/// Class representing the legacy GCC Objective-C ABI. This is the default when 578221345Sdim/// -fobjc-nonfragile-abi is not specified. 579221345Sdim/// 580221345Sdim/// The GCC ABI target actually generates code that is approximately compatible 581221345Sdim/// with the new GNUstep runtime ABI, but refrains from using any features that 582221345Sdim/// would not work with the GCC runtime. For example, clang always generates 583221345Sdim/// the extended form of the class structure, and the extra fields are simply 584221345Sdim/// ignored by GCC libobjc. 585221345Sdimclass CGObjCGCC : public CGObjCGNU { 586221345Sdim /// The GCC ABI message lookup function. Returns an IMP pointing to the 587221345Sdim /// method implementation for this message. 588221345Sdim LazyRuntimeFunction MsgLookupFn; 589221345Sdim /// The GCC ABI superclass message lookup function. Takes a pointer to a 590221345Sdim /// structure describing the receiver and the class, and a selector as 591221345Sdim /// arguments. Returns the IMP for the corresponding method. 592221345Sdim LazyRuntimeFunction MsgLookupSuperFn; 593221345Sdimprotected: 594276479Sdim llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver, 595276479Sdim llvm::Value *cmd, llvm::MDNode *node, 596276479Sdim MessageSendInfo &MSI) override { 597221345Sdim CGBuilderTy &Builder = CGF.Builder; 598228379Sdim llvm::Value *args[] = { 599234353Sdim EnforceType(Builder, Receiver, IdTy), 600234353Sdim EnforceType(Builder, cmd, SelectorTy) }; 601249423Sdim llvm::CallSite imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFn, args); 602228379Sdim imp->setMetadata(msgSendMDKind, node); 603228379Sdim return imp.getInstruction(); 604221345Sdim } 605296417Sdim llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper, 606276479Sdim llvm::Value *cmd, MessageSendInfo &MSI) override { 607221345Sdim CGBuilderTy &Builder = CGF.Builder; 608221345Sdim llvm::Value *lookupArgs[] = {EnforceType(Builder, ObjCSuper, 609296417Sdim PtrToObjCSuperTy).getPointer(), cmd}; 610249423Sdim return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFn, lookupArgs); 611221345Sdim } 612221345Sdim public: 613221345Sdim CGObjCGCC(CodeGenModule &Mod) : CGObjCGNU(Mod, 8, 2) { 614221345Sdim // IMP objc_msg_lookup(id, SEL); 615276479Sdim MsgLookupFn.init(&CGM, "objc_msg_lookup", IMPTy, IdTy, SelectorTy, 616276479Sdim nullptr); 617221345Sdim // IMP objc_msg_lookup_super(struct objc_super*, SEL); 618221345Sdim MsgLookupSuperFn.init(&CGM, "objc_msg_lookup_super", IMPTy, 619276479Sdim PtrToObjCSuperTy, SelectorTy, nullptr); 620221345Sdim } 621221345Sdim}; 622221345Sdim/// Class used when targeting the new GNUstep runtime ABI. 623221345Sdimclass CGObjCGNUstep : public CGObjCGNU { 624221345Sdim /// The slot lookup function. Returns a pointer to a cacheable structure 625221345Sdim /// that contains (among other things) the IMP. 626221345Sdim LazyRuntimeFunction SlotLookupFn; 627221345Sdim /// The GNUstep ABI superclass message lookup function. Takes a pointer to 628221345Sdim /// a structure describing the receiver and the class, and a selector as 629221345Sdim /// arguments. Returns the slot for the corresponding method. Superclass 630221345Sdim /// message lookup rarely changes, so this is a good caching opportunity. 631221345Sdim LazyRuntimeFunction SlotLookupSuperFn; 632249423Sdim /// Specialised function for setting atomic retain properties 633249423Sdim LazyRuntimeFunction SetPropertyAtomic; 634249423Sdim /// Specialised function for setting atomic copy properties 635249423Sdim LazyRuntimeFunction SetPropertyAtomicCopy; 636249423Sdim /// Specialised function for setting nonatomic retain properties 637249423Sdim LazyRuntimeFunction SetPropertyNonAtomic; 638249423Sdim /// Specialised function for setting nonatomic copy properties 639249423Sdim LazyRuntimeFunction SetPropertyNonAtomicCopy; 640249423Sdim /// Function to perform atomic copies of C++ objects with nontrivial copy 641249423Sdim /// constructors from Objective-C ivars. 642249423Sdim LazyRuntimeFunction CxxAtomicObjectGetFn; 643249423Sdim /// Function to perform atomic copies of C++ objects with nontrivial copy 644249423Sdim /// constructors to Objective-C ivars. 645249423Sdim LazyRuntimeFunction CxxAtomicObjectSetFn; 646221345Sdim /// Type of an slot structure pointer. This is returned by the various 647221345Sdim /// lookup functions. 648221345Sdim llvm::Type *SlotTy; 649243830Sdim public: 650276479Sdim llvm::Constant *GetEHType(QualType T) override; 651221345Sdim protected: 652276479Sdim llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver, 653276479Sdim llvm::Value *cmd, llvm::MDNode *node, 654276479Sdim MessageSendInfo &MSI) override { 655221345Sdim CGBuilderTy &Builder = CGF.Builder; 656221345Sdim llvm::Function *LookupFn = SlotLookupFn; 657221345Sdim 658221345Sdim // Store the receiver on the stack so that we can reload it later 659296417Sdim Address ReceiverPtr = 660296417Sdim CGF.CreateTempAlloca(Receiver->getType(), CGF.getPointerAlign()); 661221345Sdim Builder.CreateStore(Receiver, ReceiverPtr); 662221345Sdim 663221345Sdim llvm::Value *self; 664221345Sdim 665221345Sdim if (isa<ObjCMethodDecl>(CGF.CurCodeDecl)) { 666221345Sdim self = CGF.LoadObjCSelf(); 667221345Sdim } else { 668221345Sdim self = llvm::ConstantPointerNull::get(IdTy); 669221345Sdim } 670221345Sdim 671221345Sdim // The lookup function is guaranteed not to capture the receiver pointer. 672221345Sdim LookupFn->setDoesNotCapture(1); 673221345Sdim 674228379Sdim llvm::Value *args[] = { 675296417Sdim EnforceType(Builder, ReceiverPtr.getPointer(), PtrToIdTy), 676234353Sdim EnforceType(Builder, cmd, SelectorTy), 677234353Sdim EnforceType(Builder, self, IdTy) }; 678249423Sdim llvm::CallSite slot = CGF.EmitRuntimeCallOrInvoke(LookupFn, args); 679228379Sdim slot.setOnlyReadsMemory(); 680221345Sdim slot->setMetadata(msgSendMDKind, node); 681221345Sdim 682221345Sdim // Load the imp from the slot 683296417Sdim llvm::Value *imp = Builder.CreateAlignedLoad( 684296417Sdim Builder.CreateStructGEP(nullptr, slot.getInstruction(), 4), 685296417Sdim CGF.getPointerAlign()); 686221345Sdim 687221345Sdim // The lookup function may have changed the receiver, so make sure we use 688221345Sdim // the new one. 689221345Sdim Receiver = Builder.CreateLoad(ReceiverPtr, true); 690221345Sdim return imp; 691221345Sdim } 692296417Sdim llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper, 693276479Sdim llvm::Value *cmd, 694276479Sdim MessageSendInfo &MSI) override { 695221345Sdim CGBuilderTy &Builder = CGF.Builder; 696296417Sdim llvm::Value *lookupArgs[] = {ObjCSuper.getPointer(), cmd}; 697221345Sdim 698249423Sdim llvm::CallInst *slot = 699249423Sdim CGF.EmitNounwindRuntimeCall(SlotLookupSuperFn, lookupArgs); 700221345Sdim slot->setOnlyReadsMemory(); 701221345Sdim 702296417Sdim return Builder.CreateAlignedLoad(Builder.CreateStructGEP(nullptr, slot, 4), 703296417Sdim CGF.getPointerAlign()); 704221345Sdim } 705221345Sdim public: 706221345Sdim CGObjCGNUstep(CodeGenModule &Mod) : CGObjCGNU(Mod, 9, 3) { 707249423Sdim const ObjCRuntime &R = CGM.getLangOpts().ObjCRuntime; 708249423Sdim 709224145Sdim llvm::StructType *SlotStructTy = llvm::StructType::get(PtrTy, 710276479Sdim PtrTy, PtrTy, IntTy, IMPTy, nullptr); 711221345Sdim SlotTy = llvm::PointerType::getUnqual(SlotStructTy); 712221345Sdim // Slot_t objc_msg_lookup_sender(id *receiver, SEL selector, id sender); 713221345Sdim SlotLookupFn.init(&CGM, "objc_msg_lookup_sender", SlotTy, PtrToIdTy, 714276479Sdim SelectorTy, IdTy, nullptr); 715221345Sdim // Slot_t objc_msg_lookup_super(struct objc_super*, SEL); 716221345Sdim SlotLookupSuperFn.init(&CGM, "objc_slot_lookup_super", SlotTy, 717276479Sdim PtrToObjCSuperTy, SelectorTy, nullptr); 718221345Sdim // If we're in ObjC++ mode, then we want to make 719234353Sdim if (CGM.getLangOpts().CPlusPlus) { 720224145Sdim llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext); 721221345Sdim // void *__cxa_begin_catch(void *e) 722276479Sdim EnterCatchFn.init(&CGM, "__cxa_begin_catch", PtrTy, PtrTy, nullptr); 723221345Sdim // void __cxa_end_catch(void) 724276479Sdim ExitCatchFn.init(&CGM, "__cxa_end_catch", VoidTy, nullptr); 725221345Sdim // void _Unwind_Resume_or_Rethrow(void*) 726249423Sdim ExceptionReThrowFn.init(&CGM, "_Unwind_Resume_or_Rethrow", VoidTy, 727276479Sdim PtrTy, nullptr); 728249423Sdim } else if (R.getVersion() >= VersionTuple(1, 7)) { 729249423Sdim llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext); 730249423Sdim // id objc_begin_catch(void *e) 731276479Sdim EnterCatchFn.init(&CGM, "objc_begin_catch", IdTy, PtrTy, nullptr); 732249423Sdim // void objc_end_catch(void) 733276479Sdim ExitCatchFn.init(&CGM, "objc_end_catch", VoidTy, nullptr); 734249423Sdim // void _Unwind_Resume_or_Rethrow(void*) 735249423Sdim ExceptionReThrowFn.init(&CGM, "objc_exception_rethrow", VoidTy, 736276479Sdim PtrTy, nullptr); 737221345Sdim } 738249423Sdim llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext); 739249423Sdim SetPropertyAtomic.init(&CGM, "objc_setProperty_atomic", VoidTy, IdTy, 740276479Sdim SelectorTy, IdTy, PtrDiffTy, nullptr); 741249423Sdim SetPropertyAtomicCopy.init(&CGM, "objc_setProperty_atomic_copy", VoidTy, 742276479Sdim IdTy, SelectorTy, IdTy, PtrDiffTy, nullptr); 743249423Sdim SetPropertyNonAtomic.init(&CGM, "objc_setProperty_nonatomic", VoidTy, 744276479Sdim IdTy, SelectorTy, IdTy, PtrDiffTy, nullptr); 745249423Sdim SetPropertyNonAtomicCopy.init(&CGM, "objc_setProperty_nonatomic_copy", 746276479Sdim VoidTy, IdTy, SelectorTy, IdTy, PtrDiffTy, nullptr); 747249423Sdim // void objc_setCppObjectAtomic(void *dest, const void *src, void 748249423Sdim // *helper); 749249423Sdim CxxAtomicObjectSetFn.init(&CGM, "objc_setCppObjectAtomic", VoidTy, PtrTy, 750276479Sdim PtrTy, PtrTy, nullptr); 751249423Sdim // void objc_getCppObjectAtomic(void *dest, const void *src, void 752249423Sdim // *helper); 753249423Sdim CxxAtomicObjectGetFn.init(&CGM, "objc_getCppObjectAtomic", VoidTy, PtrTy, 754276479Sdim PtrTy, PtrTy, nullptr); 755221345Sdim } 756276479Sdim llvm::Constant *GetCppAtomicObjectGetFunction() override { 757249423Sdim // The optimised functions were added in version 1.7 of the GNUstep 758249423Sdim // runtime. 759249423Sdim assert (CGM.getLangOpts().ObjCRuntime.getVersion() >= 760249423Sdim VersionTuple(1, 7)); 761249423Sdim return CxxAtomicObjectGetFn; 762249423Sdim } 763276479Sdim llvm::Constant *GetCppAtomicObjectSetFunction() override { 764249423Sdim // The optimised functions were added in version 1.7 of the GNUstep 765249423Sdim // runtime. 766249423Sdim assert (CGM.getLangOpts().ObjCRuntime.getVersion() >= 767249423Sdim VersionTuple(1, 7)); 768249423Sdim return CxxAtomicObjectSetFn; 769249423Sdim } 770276479Sdim llvm::Constant *GetOptimizedPropertySetFunction(bool atomic, 771276479Sdim bool copy) override { 772249423Sdim // The optimised property functions omit the GC check, and so are not 773249423Sdim // safe to use in GC mode. The standard functions are fast in GC mode, 774249423Sdim // so there is less advantage in using them. 775249423Sdim assert ((CGM.getLangOpts().getGC() == LangOptions::NonGC)); 776249423Sdim // The optimised functions were added in version 1.7 of the GNUstep 777249423Sdim // runtime. 778249423Sdim assert (CGM.getLangOpts().ObjCRuntime.getVersion() >= 779249423Sdim VersionTuple(1, 7)); 780249423Sdim 781249423Sdim if (atomic) { 782249423Sdim if (copy) return SetPropertyAtomicCopy; 783249423Sdim return SetPropertyAtomic; 784249423Sdim } 785249423Sdim 786276479Sdim return copy ? SetPropertyNonAtomicCopy : SetPropertyNonAtomic; 787249423Sdim } 788221345Sdim}; 789221345Sdim 790261991Sdim/// Support for the ObjFW runtime. 791243830Sdimclass CGObjCObjFW: public CGObjCGNU { 792243830Sdimprotected: 793243830Sdim /// The GCC ABI message lookup function. Returns an IMP pointing to the 794243830Sdim /// method implementation for this message. 795243830Sdim LazyRuntimeFunction MsgLookupFn; 796261991Sdim /// stret lookup function. While this does not seem to make sense at the 797261991Sdim /// first look, this is required to call the correct forwarding function. 798261991Sdim LazyRuntimeFunction MsgLookupFnSRet; 799243830Sdim /// The GCC ABI superclass message lookup function. Takes a pointer to a 800243830Sdim /// structure describing the receiver and the class, and a selector as 801243830Sdim /// arguments. Returns the IMP for the corresponding method. 802261991Sdim LazyRuntimeFunction MsgLookupSuperFn, MsgLookupSuperFnSRet; 803243830Sdim 804276479Sdim llvm::Value *LookupIMP(CodeGenFunction &CGF, llvm::Value *&Receiver, 805276479Sdim llvm::Value *cmd, llvm::MDNode *node, 806276479Sdim MessageSendInfo &MSI) override { 807243830Sdim CGBuilderTy &Builder = CGF.Builder; 808243830Sdim llvm::Value *args[] = { 809243830Sdim EnforceType(Builder, Receiver, IdTy), 810243830Sdim EnforceType(Builder, cmd, SelectorTy) }; 811261991Sdim 812261991Sdim llvm::CallSite imp; 813261991Sdim if (CGM.ReturnTypeUsesSRet(MSI.CallInfo)) 814261991Sdim imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFnSRet, args); 815261991Sdim else 816261991Sdim imp = CGF.EmitRuntimeCallOrInvoke(MsgLookupFn, args); 817261991Sdim 818243830Sdim imp->setMetadata(msgSendMDKind, node); 819243830Sdim return imp.getInstruction(); 820243830Sdim } 821243830Sdim 822296417Sdim llvm::Value *LookupIMPSuper(CodeGenFunction &CGF, Address ObjCSuper, 823276479Sdim llvm::Value *cmd, MessageSendInfo &MSI) override { 824243830Sdim CGBuilderTy &Builder = CGF.Builder; 825296417Sdim llvm::Value *lookupArgs[] = {EnforceType(Builder, ObjCSuper.getPointer(), 826243830Sdim PtrToObjCSuperTy), cmd}; 827261991Sdim 828261991Sdim if (CGM.ReturnTypeUsesSRet(MSI.CallInfo)) 829261991Sdim return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFnSRet, lookupArgs); 830261991Sdim else 831261991Sdim return CGF.EmitNounwindRuntimeCall(MsgLookupSuperFn, lookupArgs); 832243830Sdim } 833243830Sdim 834276479Sdim llvm::Value *GetClassNamed(CodeGenFunction &CGF, 835276479Sdim const std::string &Name, bool isWeak) override { 836239462Sdim if (isWeak) 837249423Sdim return CGObjCGNU::GetClassNamed(CGF, Name, isWeak); 838239462Sdim 839239462Sdim EmitClassRef(Name); 840239462Sdim 841239462Sdim std::string SymbolName = "_OBJC_CLASS_" + Name; 842239462Sdim 843239462Sdim llvm::GlobalVariable *ClassSymbol = TheModule.getGlobalVariable(SymbolName); 844239462Sdim 845239462Sdim if (!ClassSymbol) 846239462Sdim ClassSymbol = new llvm::GlobalVariable(TheModule, LongTy, false, 847239462Sdim llvm::GlobalValue::ExternalLinkage, 848276479Sdim nullptr, SymbolName); 849239462Sdim 850239462Sdim return ClassSymbol; 851239462Sdim } 852239462Sdim 853239462Sdimpublic: 854243830Sdim CGObjCObjFW(CodeGenModule &Mod): CGObjCGNU(Mod, 9, 3) { 855243830Sdim // IMP objc_msg_lookup(id, SEL); 856276479Sdim MsgLookupFn.init(&CGM, "objc_msg_lookup", IMPTy, IdTy, SelectorTy, nullptr); 857261991Sdim MsgLookupFnSRet.init(&CGM, "objc_msg_lookup_stret", IMPTy, IdTy, 858276479Sdim SelectorTy, nullptr); 859243830Sdim // IMP objc_msg_lookup_super(struct objc_super*, SEL); 860243830Sdim MsgLookupSuperFn.init(&CGM, "objc_msg_lookup_super", IMPTy, 861276479Sdim PtrToObjCSuperTy, SelectorTy, nullptr); 862261991Sdim MsgLookupSuperFnSRet.init(&CGM, "objc_msg_lookup_super_stret", IMPTy, 863276479Sdim PtrToObjCSuperTy, SelectorTy, nullptr); 864243830Sdim } 865239462Sdim}; 866193326Sed} // end anonymous namespace 867193326Sed 868193326Sed 869194613Sed/// Emits a reference to a dummy variable which is emitted with each class. 870194613Sed/// This ensures that a linker error will be generated when trying to link 871194613Sed/// together modules where a referenced class is not defined. 872198092Srdivackyvoid CGObjCGNU::EmitClassRef(const std::string &className) { 873194613Sed std::string symbolRef = "__objc_class_ref_" + className; 874194613Sed // Don't emit two copies of the same symbol 875198092Srdivacky if (TheModule.getGlobalVariable(symbolRef)) 876198092Srdivacky return; 877194613Sed std::string symbolName = "__objc_class_name_" + className; 878194613Sed llvm::GlobalVariable *ClassSymbol = TheModule.getGlobalVariable(symbolName); 879194613Sed if (!ClassSymbol) { 880198092Srdivacky ClassSymbol = new llvm::GlobalVariable(TheModule, LongTy, false, 881276479Sdim llvm::GlobalValue::ExternalLinkage, 882276479Sdim nullptr, symbolName); 883194613Sed } 884198092Srdivacky new llvm::GlobalVariable(TheModule, ClassSymbol->getType(), true, 885198092Srdivacky llvm::GlobalValue::WeakAnyLinkage, ClassSymbol, symbolRef); 886194613Sed} 887193326Sed 888280031Sdimstatic std::string SymbolNameForMethod( StringRef ClassName, 889280031Sdim StringRef CategoryName, const Selector MethodName, 890221345Sdim bool isClassMethod) { 891221345Sdim std::string MethodNameColonStripped = MethodName.getAsString(); 892202379Srdivacky std::replace(MethodNameColonStripped.begin(), MethodNameColonStripped.end(), 893202379Srdivacky ':', '_'); 894226633Sdim return (Twine(isClassMethod ? "_c_" : "_i_") + ClassName + "_" + 895221345Sdim CategoryName + "_" + MethodNameColonStripped).str(); 896193326Sed} 897193326Sed 898221345SdimCGObjCGNU::CGObjCGNU(CodeGenModule &cgm, unsigned runtimeABIVersion, 899276479Sdim unsigned protocolClassVersion) 900234353Sdim : CGObjCRuntime(cgm), TheModule(CGM.getModule()), 901276479Sdim VMContext(cgm.getLLVMContext()), ClassPtrAlias(nullptr), 902276479Sdim MetaClassPtrAlias(nullptr), RuntimeVersion(runtimeABIVersion), 903276479Sdim ProtocolVersion(protocolClassVersion) { 904207619Srdivacky 905207619Srdivacky msgSendMDKind = VMContext.getMDKindID("GNUObjCMessageSend"); 906207619Srdivacky 907221345Sdim CodeGenTypes &Types = CGM.getTypes(); 908193326Sed IntTy = cast<llvm::IntegerType>( 909221345Sdim Types.ConvertType(CGM.getContext().IntTy)); 910193326Sed LongTy = cast<llvm::IntegerType>( 911221345Sdim Types.ConvertType(CGM.getContext().LongTy)); 912218893Sdim SizeTy = cast<llvm::IntegerType>( 913221345Sdim Types.ConvertType(CGM.getContext().getSizeType())); 914218893Sdim PtrDiffTy = cast<llvm::IntegerType>( 915221345Sdim Types.ConvertType(CGM.getContext().getPointerDiffType())); 916218893Sdim BoolTy = CGM.getTypes().ConvertType(CGM.getContext().BoolTy); 917198092Srdivacky 918198092Srdivacky Int8Ty = llvm::Type::getInt8Ty(VMContext); 919198092Srdivacky // C string type. Used in lots of places. 920198092Srdivacky PtrToInt8Ty = llvm::PointerType::getUnqual(Int8Ty); 921198092Srdivacky 922193326Sed Zeros[0] = llvm::ConstantInt::get(LongTy, 0); 923193326Sed Zeros[1] = Zeros[0]; 924198092Srdivacky NULLPtr = llvm::ConstantPointerNull::get(PtrToInt8Ty); 925193326Sed // Get the selector Type. 926202879Srdivacky QualType selTy = CGM.getContext().getObjCSelType(); 927202879Srdivacky if (QualType() == selTy) { 928202879Srdivacky SelectorTy = PtrToInt8Ty; 929202879Srdivacky } else { 930202879Srdivacky SelectorTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(selTy)); 931202879Srdivacky } 932193326Sed 933193326Sed PtrToIntTy = llvm::PointerType::getUnqual(IntTy); 934193326Sed PtrTy = PtrToInt8Ty; 935198092Srdivacky 936226633Sdim Int32Ty = llvm::Type::getInt32Ty(VMContext); 937226633Sdim Int64Ty = llvm::Type::getInt64Ty(VMContext); 938226633Sdim 939226633Sdim IntPtrTy = 940276479Sdim CGM.getDataLayout().getPointerSizeInBits() == 32 ? Int32Ty : Int64Ty; 941226633Sdim 942193326Sed // Object type 943221345Sdim QualType UnqualIdTy = CGM.getContext().getObjCIdType(); 944221345Sdim ASTIdTy = CanQualType(); 945221345Sdim if (UnqualIdTy != QualType()) { 946221345Sdim ASTIdTy = CGM.getContext().getCanonicalType(UnqualIdTy); 947221345Sdim IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy)); 948221345Sdim } else { 949202879Srdivacky IdTy = PtrToInt8Ty; 950202879Srdivacky } 951203955Srdivacky PtrToIdTy = llvm::PointerType::getUnqual(IdTy); 952198092Srdivacky 953276479Sdim ObjCSuperTy = llvm::StructType::get(IdTy, IdTy, nullptr); 954221345Sdim PtrToObjCSuperTy = llvm::PointerType::getUnqual(ObjCSuperTy); 955221345Sdim 956224145Sdim llvm::Type *VoidTy = llvm::Type::getVoidTy(VMContext); 957221345Sdim 958221345Sdim // void objc_exception_throw(id); 959276479Sdim ExceptionThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy, nullptr); 960276479Sdim ExceptionReThrowFn.init(&CGM, "objc_exception_throw", VoidTy, IdTy, nullptr); 961221345Sdim // int objc_sync_enter(id); 962276479Sdim SyncEnterFn.init(&CGM, "objc_sync_enter", IntTy, IdTy, nullptr); 963221345Sdim // int objc_sync_exit(id); 964276479Sdim SyncExitFn.init(&CGM, "objc_sync_exit", IntTy, IdTy, nullptr); 965221345Sdim 966221345Sdim // void objc_enumerationMutation (id) 967221345Sdim EnumerationMutationFn.init(&CGM, "objc_enumerationMutation", VoidTy, 968276479Sdim IdTy, nullptr); 969221345Sdim 970221345Sdim // id objc_getProperty(id, SEL, ptrdiff_t, BOOL) 971221345Sdim GetPropertyFn.init(&CGM, "objc_getProperty", IdTy, IdTy, SelectorTy, 972276479Sdim PtrDiffTy, BoolTy, nullptr); 973221345Sdim // void objc_setProperty(id, SEL, ptrdiff_t, id, BOOL, BOOL) 974221345Sdim SetPropertyFn.init(&CGM, "objc_setProperty", VoidTy, IdTy, SelectorTy, 975276479Sdim PtrDiffTy, IdTy, BoolTy, BoolTy, nullptr); 976221345Sdim // void objc_setPropertyStruct(void*, void*, ptrdiff_t, BOOL, BOOL) 977221345Sdim GetStructPropertyFn.init(&CGM, "objc_getPropertyStruct", VoidTy, PtrTy, PtrTy, 978276479Sdim PtrDiffTy, BoolTy, BoolTy, nullptr); 979221345Sdim // void objc_setPropertyStruct(void*, void*, ptrdiff_t, BOOL, BOOL) 980221345Sdim SetStructPropertyFn.init(&CGM, "objc_setPropertyStruct", VoidTy, PtrTy, PtrTy, 981276479Sdim PtrDiffTy, BoolTy, BoolTy, nullptr); 982221345Sdim 983193326Sed // IMP type 984224145Sdim llvm::Type *IMPArgs[] = { IdTy, SelectorTy }; 985221345Sdim IMPTy = llvm::PointerType::getUnqual(llvm::FunctionType::get(IdTy, IMPArgs, 986221345Sdim true)); 987203955Srdivacky 988234353Sdim const LangOptions &Opts = CGM.getLangOpts(); 989226633Sdim if ((Opts.getGC() != LangOptions::NonGC) || Opts.ObjCAutoRefCount) 990224145Sdim RuntimeVersion = 10; 991224145Sdim 992221345Sdim // Don't bother initialising the GC stuff unless we're compiling in GC mode 993226633Sdim if (Opts.getGC() != LangOptions::NonGC) { 994223017Sdim // This is a bit of an hack. We should sort this out by having a proper 995223017Sdim // CGObjCGNUstep subclass for GC, but we may want to really support the old 996223017Sdim // ABI and GC added in ObjectiveC2.framework, so we fudge it a bit for now 997203955Srdivacky // Get selectors needed in GC mode 998203955Srdivacky RetainSel = GetNullarySelector("retain", CGM.getContext()); 999203955Srdivacky ReleaseSel = GetNullarySelector("release", CGM.getContext()); 1000203955Srdivacky AutoreleaseSel = GetNullarySelector("autorelease", CGM.getContext()); 1001203955Srdivacky 1002203955Srdivacky // Get functions needed in GC mode 1003203955Srdivacky 1004203955Srdivacky // id objc_assign_ivar(id, id, ptrdiff_t); 1005221345Sdim IvarAssignFn.init(&CGM, "objc_assign_ivar", IdTy, IdTy, IdTy, PtrDiffTy, 1006276479Sdim nullptr); 1007203955Srdivacky // id objc_assign_strongCast (id, id*) 1008221345Sdim StrongCastAssignFn.init(&CGM, "objc_assign_strongCast", IdTy, IdTy, 1009276479Sdim PtrToIdTy, nullptr); 1010203955Srdivacky // id objc_assign_global(id, id*); 1011221345Sdim GlobalAssignFn.init(&CGM, "objc_assign_global", IdTy, IdTy, PtrToIdTy, 1012276479Sdim nullptr); 1013203955Srdivacky // id objc_assign_weak(id, id*); 1014276479Sdim WeakAssignFn.init(&CGM, "objc_assign_weak", IdTy, IdTy, PtrToIdTy, nullptr); 1015203955Srdivacky // id objc_read_weak(id*); 1016276479Sdim WeakReadFn.init(&CGM, "objc_read_weak", IdTy, PtrToIdTy, nullptr); 1017203955Srdivacky // void *objc_memmove_collectable(void*, void *, size_t); 1018221345Sdim MemMoveFn.init(&CGM, "objc_memmove_collectable", PtrTy, PtrTy, PtrTy, 1019276479Sdim SizeTy, nullptr); 1020203955Srdivacky } 1021193326Sed} 1022198092Srdivacky 1023249423Sdimllvm::Value *CGObjCGNU::GetClassNamed(CodeGenFunction &CGF, 1024224145Sdim const std::string &Name, 1025224145Sdim bool isWeak) { 1026296417Sdim llvm::Constant *ClassName = MakeConstantString(Name); 1027202379Srdivacky // With the incompatible ABI, this will need to be replaced with a direct 1028202379Srdivacky // reference to the class symbol. For the compatible nonfragile ABI we are 1029202379Srdivacky // still performing this lookup at run time but emitting the symbol for the 1030202379Srdivacky // class externally so that we can make the switch later. 1031224145Sdim // 1032224145Sdim // Libobjc2 contains an LLVM pass that replaces calls to objc_lookup_class 1033224145Sdim // with memoized versions or with static references if it's safe to do so. 1034224145Sdim if (!isWeak) 1035224145Sdim EmitClassRef(Name); 1036193326Sed 1037193326Sed llvm::Constant *ClassLookupFn = 1038226633Sdim CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, PtrToInt8Ty, true), 1039193326Sed "objc_lookup_class"); 1040249423Sdim return CGF.EmitNounwindRuntimeCall(ClassLookupFn, ClassName); 1041193326Sed} 1042193326Sed 1043224145Sdim// This has to perform the lookup every time, since posing and related 1044224145Sdim// techniques can modify the name -> class mapping. 1045249423Sdimllvm::Value *CGObjCGNU::GetClass(CodeGenFunction &CGF, 1046224145Sdim const ObjCInterfaceDecl *OID) { 1047249423Sdim return GetClassNamed(CGF, OID->getNameAsString(), OID->isWeakImported()); 1048224145Sdim} 1049249423Sdimllvm::Value *CGObjCGNU::EmitNSAutoreleasePoolClassRef(CodeGenFunction &CGF) { 1050249423Sdim return GetClassNamed(CGF, "NSAutoreleasePool", false); 1051224145Sdim} 1052224145Sdim 1053249423Sdimllvm::Value *CGObjCGNU::GetSelector(CodeGenFunction &CGF, Selector Sel, 1054296417Sdim const std::string &TypeEncoding) { 1055221345Sdim 1056261991Sdim SmallVectorImpl<TypedSelector> &Types = SelectorTable[Sel]; 1057276479Sdim llvm::GlobalAlias *SelValue = nullptr; 1058221345Sdim 1059226633Sdim for (SmallVectorImpl<TypedSelector>::iterator i = Types.begin(), 1060221345Sdim e = Types.end() ; i!=e ; i++) { 1061221345Sdim if (i->first == TypeEncoding) { 1062221345Sdim SelValue = i->second; 1063221345Sdim break; 1064221345Sdim } 1065221345Sdim } 1066276479Sdim if (!SelValue) { 1067276479Sdim SelValue = llvm::GlobalAlias::create( 1068296417Sdim SelectorTy->getElementType(), 0, llvm::GlobalValue::PrivateLinkage, 1069276479Sdim ".objc_selector_" + Sel.getAsString(), &TheModule); 1070288943Sdim Types.emplace_back(TypeEncoding, SelValue); 1071221345Sdim } 1072221345Sdim 1073221345Sdim return SelValue; 1074221345Sdim} 1075221345Sdim 1076296417SdimAddress CGObjCGNU::GetAddrOfSelector(CodeGenFunction &CGF, Selector Sel) { 1077296417Sdim llvm::Value *SelValue = GetSelector(CGF, Sel); 1078296417Sdim 1079296417Sdim // Store it to a temporary. Does this satisfy the semantics of 1080296417Sdim // GetAddrOfSelector? Hopefully. 1081296417Sdim Address tmp = CGF.CreateTempAlloca(SelValue->getType(), 1082296417Sdim CGF.getPointerAlign()); 1083296417Sdim CGF.Builder.CreateStore(SelValue, tmp); 1084296417Sdim return tmp; 1085193326Sed} 1086193326Sed 1087296417Sdimllvm::Value *CGObjCGNU::GetSelector(CodeGenFunction &CGF, Selector Sel) { 1088296417Sdim return GetSelector(CGF, Sel, std::string()); 1089296417Sdim} 1090296417Sdim 1091249423Sdimllvm::Value *CGObjCGNU::GetSelector(CodeGenFunction &CGF, 1092249423Sdim const ObjCMethodDecl *Method) { 1093193326Sed std::string SelTypes; 1094193326Sed CGM.getContext().getObjCEncodingForMethodDecl(Method, SelTypes); 1095296417Sdim return GetSelector(CGF, Method->getSelector(), SelTypes); 1096221345Sdim} 1097193326Sed 1098221345Sdimllvm::Constant *CGObjCGNU::GetEHType(QualType T) { 1099243830Sdim if (T->isObjCIdType() || T->isObjCQualifiedIdType()) { 1100243830Sdim // With the old ABI, there was only one kind of catchall, which broke 1101243830Sdim // foreign exceptions. With the new ABI, we use __objc_id_typeinfo as 1102243830Sdim // a pointer indicating object catchalls, and NULL to indicate real 1103243830Sdim // catchalls 1104243830Sdim if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) { 1105243830Sdim return MakeConstantString("@id"); 1106243830Sdim } else { 1107276479Sdim return nullptr; 1108243830Sdim } 1109243830Sdim } 1110221345Sdim 1111243830Sdim // All other types should be Objective-C interface pointer types. 1112243830Sdim const ObjCObjectPointerType *OPT = T->getAs<ObjCObjectPointerType>(); 1113243830Sdim assert(OPT && "Invalid @catch type."); 1114243830Sdim const ObjCInterfaceDecl *IDecl = OPT->getObjectType()->getInterface(); 1115243830Sdim assert(IDecl && "Invalid @catch type."); 1116243830Sdim return MakeConstantString(IDecl->getIdentifier()->getName()); 1117243830Sdim} 1118243830Sdim 1119243830Sdimllvm::Constant *CGObjCGNUstep::GetEHType(QualType T) { 1120243830Sdim if (!CGM.getLangOpts().CPlusPlus) 1121243830Sdim return CGObjCGNU::GetEHType(T); 1122243830Sdim 1123221345Sdim // For Objective-C++, we want to provide the ability to catch both C++ and 1124221345Sdim // Objective-C objects in the same function. 1125193326Sed 1126221345Sdim // There's a particular fixed type info for 'id'. 1127221345Sdim if (T->isObjCIdType() || 1128221345Sdim T->isObjCQualifiedIdType()) { 1129221345Sdim llvm::Constant *IDEHType = 1130221345Sdim CGM.getModule().getGlobalVariable("__objc_id_type_info"); 1131221345Sdim if (!IDEHType) 1132221345Sdim IDEHType = 1133221345Sdim new llvm::GlobalVariable(CGM.getModule(), PtrToInt8Ty, 1134221345Sdim false, 1135221345Sdim llvm::GlobalValue::ExternalLinkage, 1136276479Sdim nullptr, "__objc_id_type_info"); 1137221345Sdim return llvm::ConstantExpr::getBitCast(IDEHType, PtrToInt8Ty); 1138221345Sdim } 1139193326Sed 1140221345Sdim const ObjCObjectPointerType *PT = 1141221345Sdim T->getAs<ObjCObjectPointerType>(); 1142221345Sdim assert(PT && "Invalid @catch type."); 1143221345Sdim const ObjCInterfaceType *IT = PT->getInterfaceType(); 1144221345Sdim assert(IT && "Invalid @catch type."); 1145221345Sdim std::string className = IT->getDecl()->getIdentifier()->getName(); 1146193326Sed 1147221345Sdim std::string typeinfoName = "__objc_eh_typeinfo_" + className; 1148212904Sdim 1149221345Sdim // Return the existing typeinfo if it exists 1150221345Sdim llvm::Constant *typeinfo = TheModule.getGlobalVariable(typeinfoName); 1151234353Sdim if (typeinfo) 1152234353Sdim return llvm::ConstantExpr::getBitCast(typeinfo, PtrToInt8Ty); 1153221345Sdim 1154221345Sdim // Otherwise create it. 1155221345Sdim 1156221345Sdim // vtable for gnustep::libobjc::__objc_class_type_info 1157221345Sdim // It's quite ugly hard-coding this. Ideally we'd generate it using the host 1158221345Sdim // platform's name mangling. 1159221345Sdim const char *vtableName = "_ZTVN7gnustep7libobjc22__objc_class_type_infoE"; 1160288943Sdim auto *Vtable = TheModule.getGlobalVariable(vtableName); 1161221345Sdim if (!Vtable) { 1162221345Sdim Vtable = new llvm::GlobalVariable(TheModule, PtrToInt8Ty, true, 1163276479Sdim llvm::GlobalValue::ExternalLinkage, 1164276479Sdim nullptr, vtableName); 1165198092Srdivacky } 1166221345Sdim llvm::Constant *Two = llvm::ConstantInt::get(IntTy, 2); 1167288943Sdim auto *BVtable = llvm::ConstantExpr::getBitCast( 1168288943Sdim llvm::ConstantExpr::getGetElementPtr(Vtable->getValueType(), Vtable, Two), 1169288943Sdim PtrToInt8Ty); 1170198092Srdivacky 1171221345Sdim llvm::Constant *typeName = 1172221345Sdim ExportUniqueString(className, "__objc_eh_typename_"); 1173198092Srdivacky 1174221345Sdim std::vector<llvm::Constant*> fields; 1175288943Sdim fields.push_back(BVtable); 1176221345Sdim fields.push_back(typeName); 1177221345Sdim llvm::Constant *TI = 1178296417Sdim MakeGlobal(llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, nullptr), 1179296417Sdim fields, CGM.getPointerAlign(), 1180296417Sdim "__objc_eh_typeinfo_" + className, 1181221345Sdim llvm::GlobalValue::LinkOnceODRLinkage); 1182221345Sdim return llvm::ConstantExpr::getBitCast(TI, PtrToInt8Ty); 1183193326Sed} 1184193326Sed 1185193326Sed/// Generate an NSConstantString object. 1186296417SdimConstantAddress CGObjCGNU::GenerateConstantString(const StringLiteral *SL) { 1187203955Srdivacky 1188212904Sdim std::string Str = SL->getString().str(); 1189296417Sdim CharUnits Align = CGM.getPointerAlign(); 1190202879Srdivacky 1191203955Srdivacky // Look for an existing one 1192203955Srdivacky llvm::StringMap<llvm::Constant*>::iterator old = ObjCStrings.find(Str); 1193203955Srdivacky if (old != ObjCStrings.end()) 1194296417Sdim return ConstantAddress(old->getValue(), Align); 1195203955Srdivacky 1196234353Sdim StringRef StringClass = CGM.getLangOpts().ObjCConstantStringClass; 1197234353Sdim 1198234353Sdim if (StringClass.empty()) StringClass = "NXConstantString"; 1199234353Sdim 1200234353Sdim std::string Sym = "_OBJC_CLASS_"; 1201234353Sdim Sym += StringClass; 1202234353Sdim 1203234353Sdim llvm::Constant *isa = TheModule.getNamedGlobal(Sym); 1204234353Sdim 1205234353Sdim if (!isa) 1206234353Sdim isa = new llvm::GlobalVariable(TheModule, IdTy, /* isConstant */false, 1207276479Sdim llvm::GlobalValue::ExternalWeakLinkage, nullptr, Sym); 1208234353Sdim else if (isa->getType() != PtrToIdTy) 1209234353Sdim isa = llvm::ConstantExpr::getBitCast(isa, PtrToIdTy); 1210234353Sdim 1211193326Sed std::vector<llvm::Constant*> Ivars; 1212234353Sdim Ivars.push_back(isa); 1213193326Sed Ivars.push_back(MakeConstantString(Str)); 1214193326Sed Ivars.push_back(llvm::ConstantInt::get(IntTy, Str.size())); 1215193326Sed llvm::Constant *ObjCStr = MakeGlobal( 1216276479Sdim llvm::StructType::get(PtrToIdTy, PtrToInt8Ty, IntTy, nullptr), 1217296417Sdim Ivars, Align, ".objc_str"); 1218203955Srdivacky ObjCStr = llvm::ConstantExpr::getBitCast(ObjCStr, PtrToInt8Ty); 1219203955Srdivacky ObjCStrings[Str] = ObjCStr; 1220203955Srdivacky ConstantStrings.push_back(ObjCStr); 1221296417Sdim return ConstantAddress(ObjCStr, Align); 1222193326Sed} 1223193326Sed 1224193326Sed///Generates a message send where the super is the receiver. This is a message 1225193326Sed///send to self with special delivery semantics indicating which class's method 1226193326Sed///should be called. 1227221345SdimRValue 1228221345SdimCGObjCGNU::GenerateMessageSendSuper(CodeGenFunction &CGF, 1229208600Srdivacky ReturnValueSlot Return, 1230193326Sed QualType ResultType, 1231193326Sed Selector Sel, 1232193326Sed const ObjCInterfaceDecl *Class, 1233193326Sed bool isCategoryImpl, 1234193326Sed llvm::Value *Receiver, 1235193326Sed bool IsClassMessage, 1236198092Srdivacky const CallArgList &CallArgs, 1237198092Srdivacky const ObjCMethodDecl *Method) { 1238223017Sdim CGBuilderTy &Builder = CGF.Builder; 1239234353Sdim if (CGM.getLangOpts().getGC() == LangOptions::GCOnly) { 1240203955Srdivacky if (Sel == RetainSel || Sel == AutoreleaseSel) { 1241223017Sdim return RValue::get(EnforceType(Builder, Receiver, 1242223017Sdim CGM.getTypes().ConvertType(ResultType))); 1243203955Srdivacky } 1244203955Srdivacky if (Sel == ReleaseSel) { 1245276479Sdim return RValue::get(nullptr); 1246203955Srdivacky } 1247203955Srdivacky } 1248193326Sed 1249249423Sdim llvm::Value *cmd = GetSelector(CGF, Sel); 1250207619Srdivacky 1251207619Srdivacky 1252193326Sed CallArgList ActualArgs; 1253193326Sed 1254221345Sdim ActualArgs.add(RValue::get(EnforceType(Builder, Receiver, IdTy)), ASTIdTy); 1255221345Sdim ActualArgs.add(RValue::get(cmd), CGF.getContext().getObjCSelType()); 1256224145Sdim ActualArgs.addFrom(CallArgs); 1257193326Sed 1258234353Sdim MessageSendInfo MSI = getMessageSendInfo(Method, ResultType, ActualArgs); 1259193326Sed 1260276479Sdim llvm::Value *ReceiverClass = nullptr; 1261193326Sed if (isCategoryImpl) { 1262276479Sdim llvm::Constant *classLookupFunction = nullptr; 1263193326Sed if (IsClassMessage) { 1264193326Sed classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get( 1265226633Sdim IdTy, PtrTy, true), "objc_get_meta_class"); 1266193326Sed } else { 1267193326Sed classLookupFunction = CGM.CreateRuntimeFunction(llvm::FunctionType::get( 1268226633Sdim IdTy, PtrTy, true), "objc_get_class"); 1269193326Sed } 1270207619Srdivacky ReceiverClass = Builder.CreateCall(classLookupFunction, 1271193326Sed MakeConstantString(Class->getNameAsString())); 1272193326Sed } else { 1273193326Sed // Set up global aliases for the metaclass or class pointer if they do not 1274193326Sed // already exist. These will are forward-references which will be set to 1275198092Srdivacky // pointers to the class and metaclass structure created for the runtime 1276198092Srdivacky // load function. To send a message to super, we look up the value of the 1277193326Sed // super_class pointer from either the class or metaclass structure. 1278193326Sed if (IsClassMessage) { 1279193326Sed if (!MetaClassPtrAlias) { 1280276479Sdim MetaClassPtrAlias = llvm::GlobalAlias::create( 1281296417Sdim IdTy->getElementType(), 0, llvm::GlobalValue::InternalLinkage, 1282276479Sdim ".objc_metaclass_ref" + Class->getNameAsString(), &TheModule); 1283193326Sed } 1284193326Sed ReceiverClass = MetaClassPtrAlias; 1285193326Sed } else { 1286193326Sed if (!ClassPtrAlias) { 1287276479Sdim ClassPtrAlias = llvm::GlobalAlias::create( 1288296417Sdim IdTy->getElementType(), 0, llvm::GlobalValue::InternalLinkage, 1289276479Sdim ".objc_class_ref" + Class->getNameAsString(), &TheModule); 1290193326Sed } 1291193326Sed ReceiverClass = ClassPtrAlias; 1292193326Sed } 1293193326Sed } 1294193326Sed // Cast the pointer to a simplified version of the class structure 1295288943Sdim llvm::Type *CastTy = llvm::StructType::get(IdTy, IdTy, nullptr); 1296207619Srdivacky ReceiverClass = Builder.CreateBitCast(ReceiverClass, 1297288943Sdim llvm::PointerType::getUnqual(CastTy)); 1298193326Sed // Get the superclass pointer 1299288943Sdim ReceiverClass = Builder.CreateStructGEP(CastTy, ReceiverClass, 1); 1300193326Sed // Load the superclass pointer 1301296417Sdim ReceiverClass = 1302296417Sdim Builder.CreateAlignedLoad(ReceiverClass, CGF.getPointerAlign()); 1303193326Sed // Construct the structure used to look up the IMP 1304224145Sdim llvm::StructType *ObjCSuperTy = llvm::StructType::get( 1305276479Sdim Receiver->getType(), IdTy, nullptr); 1306193326Sed 1307296417Sdim // FIXME: Is this really supposed to be a dynamic alloca? 1308296417Sdim Address ObjCSuper = Address(Builder.CreateAlloca(ObjCSuperTy), 1309296417Sdim CGF.getPointerAlign()); 1310296417Sdim 1311288943Sdim Builder.CreateStore(Receiver, 1312296417Sdim Builder.CreateStructGEP(ObjCSuper, 0, CharUnits::Zero())); 1313288943Sdim Builder.CreateStore(ReceiverClass, 1314296417Sdim Builder.CreateStructGEP(ObjCSuper, 1, CGF.getPointerSize())); 1315193326Sed 1316221345Sdim ObjCSuper = EnforceType(Builder, ObjCSuper, PtrToObjCSuperTy); 1317221345Sdim 1318193326Sed // Get the IMP 1319261991Sdim llvm::Value *imp = LookupIMPSuper(CGF, ObjCSuper, cmd, MSI); 1320234353Sdim imp = EnforceType(Builder, imp, MSI.MessengerType); 1321207619Srdivacky 1322280031Sdim llvm::Metadata *impMD[] = { 1323207619Srdivacky llvm::MDString::get(VMContext, Sel.getAsString()), 1324207619Srdivacky llvm::MDString::get(VMContext, Class->getSuperClass()->getNameAsString()), 1325280031Sdim llvm::ConstantAsMetadata::get(llvm::ConstantInt::get( 1326280031Sdim llvm::Type::getInt1Ty(VMContext), IsClassMessage))}; 1327221345Sdim llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD); 1328193326Sed 1329207619Srdivacky llvm::Instruction *call; 1330296417Sdim RValue msgRet = CGF.EmitCall(MSI.CallInfo, imp, Return, ActualArgs, 1331296417Sdim CGCalleeInfo(), &call); 1332207619Srdivacky call->setMetadata(msgSendMDKind, node); 1333207619Srdivacky return msgRet; 1334193326Sed} 1335193326Sed 1336198092Srdivacky/// Generate code for a message send expression. 1337221345SdimRValue 1338221345SdimCGObjCGNU::GenerateMessageSend(CodeGenFunction &CGF, 1339208600Srdivacky ReturnValueSlot Return, 1340193326Sed QualType ResultType, 1341193326Sed Selector Sel, 1342193326Sed llvm::Value *Receiver, 1343193326Sed const CallArgList &CallArgs, 1344207619Srdivacky const ObjCInterfaceDecl *Class, 1345193326Sed const ObjCMethodDecl *Method) { 1346223017Sdim CGBuilderTy &Builder = CGF.Builder; 1347223017Sdim 1348207619Srdivacky // Strip out message sends to retain / release in GC mode 1349234353Sdim if (CGM.getLangOpts().getGC() == LangOptions::GCOnly) { 1350203955Srdivacky if (Sel == RetainSel || Sel == AutoreleaseSel) { 1351223017Sdim return RValue::get(EnforceType(Builder, Receiver, 1352223017Sdim CGM.getTypes().ConvertType(ResultType))); 1353203955Srdivacky } 1354203955Srdivacky if (Sel == ReleaseSel) { 1355276479Sdim return RValue::get(nullptr); 1356203955Srdivacky } 1357203955Srdivacky } 1358207619Srdivacky 1359207619Srdivacky // If the return type is something that goes in an integer register, the 1360207619Srdivacky // runtime will handle 0 returns. For other cases, we fill in the 0 value 1361207619Srdivacky // ourselves. 1362207619Srdivacky // 1363207619Srdivacky // The language spec says the result of this kind of message send is 1364207619Srdivacky // undefined, but lots of people seem to have forgotten to read that 1365207619Srdivacky // paragraph and insist on sending messages to nil that have structure 1366207619Srdivacky // returns. With GCC, this generates a random return value (whatever happens 1367207619Srdivacky // to be on the stack / in those registers at the time) on most platforms, 1368221345Sdim // and generates an illegal instruction trap on SPARC. With LLVM it corrupts 1369221345Sdim // the stack. 1370221345Sdim bool isPointerSizedReturn = (ResultType->isAnyPointerType() || 1371221345Sdim ResultType->isIntegralOrEnumerationType() || ResultType->isVoidType()); 1372207619Srdivacky 1373276479Sdim llvm::BasicBlock *startBB = nullptr; 1374276479Sdim llvm::BasicBlock *messageBB = nullptr; 1375276479Sdim llvm::BasicBlock *continueBB = nullptr; 1376207619Srdivacky 1377207619Srdivacky if (!isPointerSizedReturn) { 1378207619Srdivacky startBB = Builder.GetInsertBlock(); 1379207619Srdivacky messageBB = CGF.createBasicBlock("msgSend"); 1380208600Srdivacky continueBB = CGF.createBasicBlock("continue"); 1381207619Srdivacky 1382207619Srdivacky llvm::Value *isNil = Builder.CreateICmpEQ(Receiver, 1383207619Srdivacky llvm::Constant::getNullValue(Receiver->getType())); 1384208600Srdivacky Builder.CreateCondBr(isNil, continueBB, messageBB); 1385207619Srdivacky CGF.EmitBlock(messageBB); 1386207619Srdivacky } 1387207619Srdivacky 1388198092Srdivacky IdTy = cast<llvm::PointerType>(CGM.getTypes().ConvertType(ASTIdTy)); 1389193326Sed llvm::Value *cmd; 1390193326Sed if (Method) 1391249423Sdim cmd = GetSelector(CGF, Method); 1392193326Sed else 1393249423Sdim cmd = GetSelector(CGF, Sel); 1394221345Sdim cmd = EnforceType(Builder, cmd, SelectorTy); 1395221345Sdim Receiver = EnforceType(Builder, Receiver, IdTy); 1396221345Sdim 1397280031Sdim llvm::Metadata *impMD[] = { 1398280031Sdim llvm::MDString::get(VMContext, Sel.getAsString()), 1399280031Sdim llvm::MDString::get(VMContext, Class ? Class->getNameAsString() : ""), 1400280031Sdim llvm::ConstantAsMetadata::get(llvm::ConstantInt::get( 1401280031Sdim llvm::Type::getInt1Ty(VMContext), Class != nullptr))}; 1402221345Sdim llvm::MDNode *node = llvm::MDNode::get(VMContext, impMD); 1403221345Sdim 1404193326Sed CallArgList ActualArgs; 1405221345Sdim ActualArgs.add(RValue::get(Receiver), ASTIdTy); 1406221345Sdim ActualArgs.add(RValue::get(cmd), CGF.getContext().getObjCSelType()); 1407224145Sdim ActualArgs.addFrom(CallArgs); 1408193326Sed 1409234353Sdim MessageSendInfo MSI = getMessageSendInfo(Method, ResultType, ActualArgs); 1410193326Sed 1411234353Sdim // Get the IMP to call 1412234353Sdim llvm::Value *imp; 1413207619Srdivacky 1414234353Sdim // If we have non-legacy dispatch specified, we try using the objc_msgSend() 1415234353Sdim // functions. These are not supported on all platforms (or all runtimes on a 1416234353Sdim // given platform), so we 1417234353Sdim switch (CGM.getCodeGenOpts().getObjCDispatchMethod()) { 1418234353Sdim case CodeGenOptions::Legacy: 1419261991Sdim imp = LookupIMP(CGF, Receiver, cmd, node, MSI); 1420234353Sdim break; 1421234353Sdim case CodeGenOptions::Mixed: 1422234353Sdim case CodeGenOptions::NonLegacy: 1423234353Sdim if (CGM.ReturnTypeUsesFPRet(ResultType)) { 1424234353Sdim imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true), 1425234353Sdim "objc_msgSend_fpret"); 1426234353Sdim } else if (CGM.ReturnTypeUsesSRet(MSI.CallInfo)) { 1427234353Sdim // The actual types here don't matter - we're going to bitcast the 1428234353Sdim // function anyway 1429234353Sdim imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true), 1430234353Sdim "objc_msgSend_stret"); 1431234353Sdim } else { 1432234353Sdim imp = CGM.CreateRuntimeFunction(llvm::FunctionType::get(IdTy, IdTy, true), 1433234353Sdim "objc_msgSend"); 1434234353Sdim } 1435234353Sdim } 1436234353Sdim 1437234353Sdim // Reset the receiver in case the lookup modified it 1438234353Sdim ActualArgs[0] = CallArg(RValue::get(Receiver), ASTIdTy, false); 1439234353Sdim 1440234353Sdim imp = EnforceType(Builder, imp, MSI.MessengerType); 1441234353Sdim 1442207619Srdivacky llvm::Instruction *call; 1443296417Sdim RValue msgRet = CGF.EmitCall(MSI.CallInfo, imp, Return, ActualArgs, 1444296417Sdim CGCalleeInfo(), &call); 1445207619Srdivacky call->setMetadata(msgSendMDKind, node); 1446193326Sed 1447208600Srdivacky 1448207619Srdivacky if (!isPointerSizedReturn) { 1449208600Srdivacky messageBB = CGF.Builder.GetInsertBlock(); 1450208600Srdivacky CGF.Builder.CreateBr(continueBB); 1451208600Srdivacky CGF.EmitBlock(continueBB); 1452207619Srdivacky if (msgRet.isScalar()) { 1453207619Srdivacky llvm::Value *v = msgRet.getScalarVal(); 1454221345Sdim llvm::PHINode *phi = Builder.CreatePHI(v->getType(), 2); 1455207619Srdivacky phi->addIncoming(v, messageBB); 1456207619Srdivacky phi->addIncoming(llvm::Constant::getNullValue(v->getType()), startBB); 1457207619Srdivacky msgRet = RValue::get(phi); 1458207619Srdivacky } else if (msgRet.isAggregate()) { 1459296417Sdim Address v = msgRet.getAggregateAddress(); 1460296417Sdim llvm::PHINode *phi = Builder.CreatePHI(v.getType(), 2); 1461296417Sdim llvm::Type *RetTy = v.getElementType(); 1462296417Sdim Address NullVal = CGF.CreateTempAlloca(RetTy, v.getAlignment(), "null"); 1463296417Sdim CGF.InitTempAlloca(NullVal, llvm::Constant::getNullValue(RetTy)); 1464296417Sdim phi->addIncoming(v.getPointer(), messageBB); 1465296417Sdim phi->addIncoming(NullVal.getPointer(), startBB); 1466296417Sdim msgRet = RValue::getAggregate(Address(phi, v.getAlignment())); 1467207619Srdivacky } else /* isComplex() */ { 1468207619Srdivacky std::pair<llvm::Value*,llvm::Value*> v = msgRet.getComplexVal(); 1469221345Sdim llvm::PHINode *phi = Builder.CreatePHI(v.first->getType(), 2); 1470207619Srdivacky phi->addIncoming(v.first, messageBB); 1471207619Srdivacky phi->addIncoming(llvm::Constant::getNullValue(v.first->getType()), 1472207619Srdivacky startBB); 1473221345Sdim llvm::PHINode *phi2 = Builder.CreatePHI(v.second->getType(), 2); 1474207619Srdivacky phi2->addIncoming(v.second, messageBB); 1475207619Srdivacky phi2->addIncoming(llvm::Constant::getNullValue(v.second->getType()), 1476207619Srdivacky startBB); 1477207619Srdivacky msgRet = RValue::getComplex(phi, phi2); 1478207619Srdivacky } 1479207619Srdivacky } 1480207619Srdivacky return msgRet; 1481193326Sed} 1482193326Sed 1483198092Srdivacky/// Generates a MethodList. Used in construction of a objc_class and 1484193326Sed/// objc_category structures. 1485234353Sdimllvm::Constant *CGObjCGNU:: 1486280031SdimGenerateMethodList(StringRef ClassName, 1487280031Sdim StringRef CategoryName, 1488234353Sdim ArrayRef<Selector> MethodSels, 1489234353Sdim ArrayRef<llvm::Constant *> MethodTypes, 1490234353Sdim bool isClassMethodList) { 1491198092Srdivacky if (MethodSels.empty()) 1492198092Srdivacky return NULLPtr; 1493198092Srdivacky // Get the method structure type. 1494224145Sdim llvm::StructType *ObjCMethodTy = llvm::StructType::get( 1495193326Sed PtrToInt8Ty, // Really a selector, but the runtime creates it us. 1496193326Sed PtrToInt8Ty, // Method types 1497221345Sdim IMPTy, //Method pointer 1498276479Sdim nullptr); 1499193326Sed std::vector<llvm::Constant*> Methods; 1500193326Sed std::vector<llvm::Constant*> Elements; 1501193326Sed for (unsigned int i = 0, e = MethodTypes.size(); i < e; ++i) { 1502193326Sed Elements.clear(); 1503221345Sdim llvm::Constant *Method = 1504193326Sed TheModule.getFunction(SymbolNameForMethod(ClassName, CategoryName, 1505221345Sdim MethodSels[i], 1506221345Sdim isClassMethodList)); 1507221345Sdim assert(Method && "Can't generate metadata for method that doesn't exist"); 1508221345Sdim llvm::Constant *C = MakeConstantString(MethodSels[i].getAsString()); 1509221345Sdim Elements.push_back(C); 1510221345Sdim Elements.push_back(MethodTypes[i]); 1511221345Sdim Method = llvm::ConstantExpr::getBitCast(Method, 1512221345Sdim IMPTy); 1513221345Sdim Elements.push_back(Method); 1514221345Sdim Methods.push_back(llvm::ConstantStruct::get(ObjCMethodTy, Elements)); 1515193326Sed } 1516193326Sed 1517193326Sed // Array of method structures 1518193326Sed llvm::ArrayType *ObjCMethodArrayTy = llvm::ArrayType::get(ObjCMethodTy, 1519193326Sed Methods.size()); 1520193326Sed llvm::Constant *MethodArray = llvm::ConstantArray::get(ObjCMethodArrayTy, 1521193326Sed Methods); 1522193326Sed 1523193326Sed // Structure containing list pointer, array and array count 1524226633Sdim llvm::StructType *ObjCMethodListTy = llvm::StructType::create(VMContext); 1525224145Sdim llvm::Type *NextPtrTy = llvm::PointerType::getUnqual(ObjCMethodListTy); 1526224145Sdim ObjCMethodListTy->setBody( 1527198092Srdivacky NextPtrTy, 1528198092Srdivacky IntTy, 1529193326Sed ObjCMethodArrayTy, 1530276479Sdim nullptr); 1531193326Sed 1532193326Sed Methods.clear(); 1533193326Sed Methods.push_back(llvm::ConstantPointerNull::get( 1534193326Sed llvm::PointerType::getUnqual(ObjCMethodListTy))); 1535226633Sdim Methods.push_back(llvm::ConstantInt::get(Int32Ty, MethodTypes.size())); 1536193326Sed Methods.push_back(MethodArray); 1537198092Srdivacky 1538193326Sed // Create an instance of the structure 1539296417Sdim return MakeGlobal(ObjCMethodListTy, Methods, CGM.getPointerAlign(), 1540296417Sdim ".objc_method_list"); 1541193326Sed} 1542193326Sed 1543193326Sed/// Generates an IvarList. Used in construction of a objc_class. 1544234353Sdimllvm::Constant *CGObjCGNU:: 1545234353SdimGenerateIvarList(ArrayRef<llvm::Constant *> IvarNames, 1546234353Sdim ArrayRef<llvm::Constant *> IvarTypes, 1547234353Sdim ArrayRef<llvm::Constant *> IvarOffsets) { 1548199482Srdivacky if (IvarNames.size() == 0) 1549199482Srdivacky return NULLPtr; 1550198092Srdivacky // Get the method structure type. 1551224145Sdim llvm::StructType *ObjCIvarTy = llvm::StructType::get( 1552193326Sed PtrToInt8Ty, 1553193326Sed PtrToInt8Ty, 1554193326Sed IntTy, 1555276479Sdim nullptr); 1556193326Sed std::vector<llvm::Constant*> Ivars; 1557193326Sed std::vector<llvm::Constant*> Elements; 1558193326Sed for (unsigned int i = 0, e = IvarNames.size() ; i < e ; i++) { 1559193326Sed Elements.clear(); 1560198092Srdivacky Elements.push_back(IvarNames[i]); 1561198092Srdivacky Elements.push_back(IvarTypes[i]); 1562193326Sed Elements.push_back(IvarOffsets[i]); 1563193326Sed Ivars.push_back(llvm::ConstantStruct::get(ObjCIvarTy, Elements)); 1564193326Sed } 1565193326Sed 1566193326Sed // Array of method structures 1567193326Sed llvm::ArrayType *ObjCIvarArrayTy = llvm::ArrayType::get(ObjCIvarTy, 1568193326Sed IvarNames.size()); 1569193326Sed 1570198092Srdivacky 1571193326Sed Elements.clear(); 1572193326Sed Elements.push_back(llvm::ConstantInt::get(IntTy, (int)IvarNames.size())); 1573193326Sed Elements.push_back(llvm::ConstantArray::get(ObjCIvarArrayTy, Ivars)); 1574193326Sed // Structure containing array and array count 1575224145Sdim llvm::StructType *ObjCIvarListTy = llvm::StructType::get(IntTy, 1576193326Sed ObjCIvarArrayTy, 1577276479Sdim nullptr); 1578193326Sed 1579193326Sed // Create an instance of the structure 1580296417Sdim return MakeGlobal(ObjCIvarListTy, Elements, CGM.getPointerAlign(), 1581296417Sdim ".objc_ivar_list"); 1582193326Sed} 1583193326Sed 1584193326Sed/// Generate a class structure 1585193326Sedllvm::Constant *CGObjCGNU::GenerateClassStructure( 1586193326Sed llvm::Constant *MetaClass, 1587193326Sed llvm::Constant *SuperClass, 1588193326Sed unsigned info, 1589193326Sed const char *Name, 1590193326Sed llvm::Constant *Version, 1591193326Sed llvm::Constant *InstanceSize, 1592193326Sed llvm::Constant *IVars, 1593193326Sed llvm::Constant *Methods, 1594198092Srdivacky llvm::Constant *Protocols, 1595198092Srdivacky llvm::Constant *IvarOffsets, 1596207619Srdivacky llvm::Constant *Properties, 1597226633Sdim llvm::Constant *StrongIvarBitmap, 1598226633Sdim llvm::Constant *WeakIvarBitmap, 1599207619Srdivacky bool isMeta) { 1600193326Sed // Set up the class structure 1601193326Sed // Note: Several of these are char*s when they should be ids. This is 1602193326Sed // because the runtime performs this translation on load. 1603198092Srdivacky // 1604198092Srdivacky // Fields marked New ABI are part of the GNUstep runtime. We emit them 1605198092Srdivacky // anyway; the classes will still work with the GNU runtime, they will just 1606198092Srdivacky // be ignored. 1607224145Sdim llvm::StructType *ClassTy = llvm::StructType::get( 1608234353Sdim PtrToInt8Ty, // isa 1609193326Sed PtrToInt8Ty, // super_class 1610193326Sed PtrToInt8Ty, // name 1611193326Sed LongTy, // version 1612193326Sed LongTy, // info 1613193326Sed LongTy, // instance_size 1614193326Sed IVars->getType(), // ivars 1615193326Sed Methods->getType(), // methods 1616198092Srdivacky // These are all filled in by the runtime, so we pretend 1617193326Sed PtrTy, // dtable 1618193326Sed PtrTy, // subclass_list 1619193326Sed PtrTy, // sibling_class 1620193326Sed PtrTy, // protocols 1621193326Sed PtrTy, // gc_object_type 1622198092Srdivacky // New ABI: 1623198092Srdivacky LongTy, // abi_version 1624198092Srdivacky IvarOffsets->getType(), // ivar_offsets 1625198092Srdivacky Properties->getType(), // properties 1626228379Sdim IntPtrTy, // strong_pointers 1627228379Sdim IntPtrTy, // weak_pointers 1628276479Sdim nullptr); 1629193326Sed llvm::Constant *Zero = llvm::ConstantInt::get(LongTy, 0); 1630193326Sed // Fill in the structure 1631193326Sed std::vector<llvm::Constant*> Elements; 1632193326Sed Elements.push_back(llvm::ConstantExpr::getBitCast(MetaClass, PtrToInt8Ty)); 1633193326Sed Elements.push_back(SuperClass); 1634193326Sed Elements.push_back(MakeConstantString(Name, ".class_name")); 1635193326Sed Elements.push_back(Zero); 1636193326Sed Elements.push_back(llvm::ConstantInt::get(LongTy, info)); 1637219077Sdim if (isMeta) { 1638243830Sdim llvm::DataLayout td(&TheModule); 1639221345Sdim Elements.push_back( 1640221345Sdim llvm::ConstantInt::get(LongTy, 1641221345Sdim td.getTypeSizeInBits(ClassTy) / 1642221345Sdim CGM.getContext().getCharWidth())); 1643219077Sdim } else 1644219077Sdim Elements.push_back(InstanceSize); 1645193326Sed Elements.push_back(IVars); 1646193326Sed Elements.push_back(Methods); 1647198092Srdivacky Elements.push_back(NULLPtr); 1648198092Srdivacky Elements.push_back(NULLPtr); 1649198092Srdivacky Elements.push_back(NULLPtr); 1650193326Sed Elements.push_back(llvm::ConstantExpr::getBitCast(Protocols, PtrTy)); 1651198092Srdivacky Elements.push_back(NULLPtr); 1652226633Sdim Elements.push_back(llvm::ConstantInt::get(LongTy, 1)); 1653198092Srdivacky Elements.push_back(IvarOffsets); 1654198092Srdivacky Elements.push_back(Properties); 1655226633Sdim Elements.push_back(StrongIvarBitmap); 1656226633Sdim Elements.push_back(WeakIvarBitmap); 1657193326Sed // Create an instance of the structure 1658202379Srdivacky // This is now an externally visible symbol, so that we can speed up class 1659234353Sdim // messages in the next ABI. We may already have some weak references to 1660234353Sdim // this, so check and fix them properly. 1661234353Sdim std::string ClassSym((isMeta ? "_OBJC_METACLASS_": "_OBJC_CLASS_") + 1662234353Sdim std::string(Name)); 1663234353Sdim llvm::GlobalVariable *ClassRef = TheModule.getNamedGlobal(ClassSym); 1664296417Sdim llvm::Constant *Class = 1665296417Sdim MakeGlobal(ClassTy, Elements, CGM.getPointerAlign(), ClassSym, 1666296417Sdim llvm::GlobalValue::ExternalLinkage); 1667234353Sdim if (ClassRef) { 1668234353Sdim ClassRef->replaceAllUsesWith(llvm::ConstantExpr::getBitCast(Class, 1669234353Sdim ClassRef->getType())); 1670234353Sdim ClassRef->removeFromParent(); 1671234353Sdim Class->setName(ClassSym); 1672234353Sdim } 1673234353Sdim return Class; 1674193326Sed} 1675193326Sed 1676234353Sdimllvm::Constant *CGObjCGNU:: 1677234353SdimGenerateProtocolMethodList(ArrayRef<llvm::Constant *> MethodNames, 1678234353Sdim ArrayRef<llvm::Constant *> MethodTypes) { 1679198092Srdivacky // Get the method structure type. 1680224145Sdim llvm::StructType *ObjCMethodDescTy = llvm::StructType::get( 1681193326Sed PtrToInt8Ty, // Really a selector, but the runtime does the casting for us. 1682193326Sed PtrToInt8Ty, 1683276479Sdim nullptr); 1684193326Sed std::vector<llvm::Constant*> Methods; 1685193326Sed std::vector<llvm::Constant*> Elements; 1686193326Sed for (unsigned int i = 0, e = MethodTypes.size() ; i < e ; i++) { 1687193326Sed Elements.clear(); 1688198092Srdivacky Elements.push_back(MethodNames[i]); 1689198092Srdivacky Elements.push_back(MethodTypes[i]); 1690193326Sed Methods.push_back(llvm::ConstantStruct::get(ObjCMethodDescTy, Elements)); 1691193326Sed } 1692193326Sed llvm::ArrayType *ObjCMethodArrayTy = llvm::ArrayType::get(ObjCMethodDescTy, 1693193326Sed MethodNames.size()); 1694198092Srdivacky llvm::Constant *Array = llvm::ConstantArray::get(ObjCMethodArrayTy, 1695198092Srdivacky Methods); 1696224145Sdim llvm::StructType *ObjCMethodDescListTy = llvm::StructType::get( 1697276479Sdim IntTy, ObjCMethodArrayTy, nullptr); 1698193326Sed Methods.clear(); 1699193326Sed Methods.push_back(llvm::ConstantInt::get(IntTy, MethodNames.size())); 1700193326Sed Methods.push_back(Array); 1701296417Sdim return MakeGlobal(ObjCMethodDescListTy, Methods, CGM.getPointerAlign(), 1702296417Sdim ".objc_method_list"); 1703193326Sed} 1704198092Srdivacky 1705193326Sed// Create the protocol list structure used in classes, categories and so on 1706234353Sdimllvm::Constant *CGObjCGNU::GenerateProtocolList(ArrayRef<std::string>Protocols){ 1707193326Sed llvm::ArrayType *ProtocolArrayTy = llvm::ArrayType::get(PtrToInt8Ty, 1708193326Sed Protocols.size()); 1709224145Sdim llvm::StructType *ProtocolListTy = llvm::StructType::get( 1710193326Sed PtrTy, //Should be a recurisve pointer, but it's always NULL here. 1711218893Sdim SizeTy, 1712193326Sed ProtocolArrayTy, 1713276479Sdim nullptr); 1714198092Srdivacky std::vector<llvm::Constant*> Elements; 1715193326Sed for (const std::string *iter = Protocols.begin(), *endIter = Protocols.end(); 1716193326Sed iter != endIter ; iter++) { 1717276479Sdim llvm::Constant *protocol = nullptr; 1718199990Srdivacky llvm::StringMap<llvm::Constant*>::iterator value = 1719199990Srdivacky ExistingProtocols.find(*iter); 1720199990Srdivacky if (value == ExistingProtocols.end()) { 1721193326Sed protocol = GenerateEmptyProtocol(*iter); 1722199990Srdivacky } else { 1723199990Srdivacky protocol = value->getValue(); 1724199990Srdivacky } 1725198092Srdivacky llvm::Constant *Ptr = llvm::ConstantExpr::getBitCast(protocol, 1726198092Srdivacky PtrToInt8Ty); 1727193326Sed Elements.push_back(Ptr); 1728193326Sed } 1729193326Sed llvm::Constant * ProtocolArray = llvm::ConstantArray::get(ProtocolArrayTy, 1730193326Sed Elements); 1731193326Sed Elements.clear(); 1732193326Sed Elements.push_back(NULLPtr); 1733193326Sed Elements.push_back(llvm::ConstantInt::get(LongTy, Protocols.size())); 1734193326Sed Elements.push_back(ProtocolArray); 1735296417Sdim return MakeGlobal(ProtocolListTy, Elements, CGM.getPointerAlign(), 1736296417Sdim ".objc_protocol_list"); 1737193326Sed} 1738193326Sed 1739249423Sdimllvm::Value *CGObjCGNU::GenerateProtocolRef(CodeGenFunction &CGF, 1740193326Sed const ObjCProtocolDecl *PD) { 1741193326Sed llvm::Value *protocol = ExistingProtocols[PD->getNameAsString()]; 1742226633Sdim llvm::Type *T = 1743193326Sed CGM.getTypes().ConvertType(CGM.getContext().getObjCProtoType()); 1744249423Sdim return CGF.Builder.CreateBitCast(protocol, llvm::PointerType::getUnqual(T)); 1745193326Sed} 1746193326Sed 1747193326Sedllvm::Constant *CGObjCGNU::GenerateEmptyProtocol( 1748193326Sed const std::string &ProtocolName) { 1749226633Sdim SmallVector<std::string, 0> EmptyStringVector; 1750226633Sdim SmallVector<llvm::Constant*, 0> EmptyConstantVector; 1751193326Sed 1752193326Sed llvm::Constant *ProtocolList = GenerateProtocolList(EmptyStringVector); 1753198092Srdivacky llvm::Constant *MethodList = 1754193326Sed GenerateProtocolMethodList(EmptyConstantVector, EmptyConstantVector); 1755193326Sed // Protocols are objects containing lists of the methods implemented and 1756193326Sed // protocols adopted. 1757224145Sdim llvm::StructType *ProtocolTy = llvm::StructType::get(IdTy, 1758193326Sed PtrToInt8Ty, 1759193326Sed ProtocolList->getType(), 1760198092Srdivacky MethodList->getType(), 1761198092Srdivacky MethodList->getType(), 1762198092Srdivacky MethodList->getType(), 1763198092Srdivacky MethodList->getType(), 1764276479Sdim nullptr); 1765198092Srdivacky std::vector<llvm::Constant*> Elements; 1766193326Sed // The isa pointer must be set to a magic number so the runtime knows it's 1767193326Sed // the correct layout. 1768193326Sed Elements.push_back(llvm::ConstantExpr::getIntToPtr( 1769226633Sdim llvm::ConstantInt::get(Int32Ty, ProtocolVersion), IdTy)); 1770193326Sed Elements.push_back(MakeConstantString(ProtocolName, ".objc_protocol_name")); 1771193326Sed Elements.push_back(ProtocolList); 1772198092Srdivacky Elements.push_back(MethodList); 1773198092Srdivacky Elements.push_back(MethodList); 1774198092Srdivacky Elements.push_back(MethodList); 1775198092Srdivacky Elements.push_back(MethodList); 1776296417Sdim return MakeGlobal(ProtocolTy, Elements, CGM.getPointerAlign(), 1777296417Sdim ".objc_protocol"); 1778193326Sed} 1779193326Sed 1780193326Sedvoid CGObjCGNU::GenerateProtocol(const ObjCProtocolDecl *PD) { 1781193326Sed ASTContext &Context = CGM.getContext(); 1782193326Sed std::string ProtocolName = PD->getNameAsString(); 1783234353Sdim 1784234353Sdim // Use the protocol definition, if there is one. 1785234353Sdim if (const ObjCProtocolDecl *Def = PD->getDefinition()) 1786234353Sdim PD = Def; 1787234353Sdim 1788226633Sdim SmallVector<std::string, 16> Protocols; 1789276479Sdim for (const auto *PI : PD->protocols()) 1790276479Sdim Protocols.push_back(PI->getNameAsString()); 1791226633Sdim SmallVector<llvm::Constant*, 16> InstanceMethodNames; 1792226633Sdim SmallVector<llvm::Constant*, 16> InstanceMethodTypes; 1793226633Sdim SmallVector<llvm::Constant*, 16> OptionalInstanceMethodNames; 1794226633Sdim SmallVector<llvm::Constant*, 16> OptionalInstanceMethodTypes; 1795276479Sdim for (const auto *I : PD->instance_methods()) { 1796193326Sed std::string TypeStr; 1797276479Sdim Context.getObjCEncodingForMethodDecl(I, TypeStr); 1798276479Sdim if (I->getImplementationControl() == ObjCMethodDecl::Optional) { 1799243830Sdim OptionalInstanceMethodNames.push_back( 1800276479Sdim MakeConstantString(I->getSelector().getAsString())); 1801243830Sdim OptionalInstanceMethodTypes.push_back(MakeConstantString(TypeStr)); 1802243830Sdim } else { 1803198092Srdivacky InstanceMethodNames.push_back( 1804276479Sdim MakeConstantString(I->getSelector().getAsString())); 1805198092Srdivacky InstanceMethodTypes.push_back(MakeConstantString(TypeStr)); 1806198092Srdivacky } 1807193326Sed } 1808193326Sed // Collect information about class methods: 1809226633Sdim SmallVector<llvm::Constant*, 16> ClassMethodNames; 1810226633Sdim SmallVector<llvm::Constant*, 16> ClassMethodTypes; 1811226633Sdim SmallVector<llvm::Constant*, 16> OptionalClassMethodNames; 1812226633Sdim SmallVector<llvm::Constant*, 16> OptionalClassMethodTypes; 1813276479Sdim for (const auto *I : PD->class_methods()) { 1814193326Sed std::string TypeStr; 1815276479Sdim Context.getObjCEncodingForMethodDecl(I,TypeStr); 1816276479Sdim if (I->getImplementationControl() == ObjCMethodDecl::Optional) { 1817243830Sdim OptionalClassMethodNames.push_back( 1818276479Sdim MakeConstantString(I->getSelector().getAsString())); 1819243830Sdim OptionalClassMethodTypes.push_back(MakeConstantString(TypeStr)); 1820243830Sdim } else { 1821198092Srdivacky ClassMethodNames.push_back( 1822276479Sdim MakeConstantString(I->getSelector().getAsString())); 1823198092Srdivacky ClassMethodTypes.push_back(MakeConstantString(TypeStr)); 1824198092Srdivacky } 1825193326Sed } 1826193326Sed 1827193326Sed llvm::Constant *ProtocolList = GenerateProtocolList(Protocols); 1828193326Sed llvm::Constant *InstanceMethodList = 1829193326Sed GenerateProtocolMethodList(InstanceMethodNames, InstanceMethodTypes); 1830193326Sed llvm::Constant *ClassMethodList = 1831193326Sed GenerateProtocolMethodList(ClassMethodNames, ClassMethodTypes); 1832198092Srdivacky llvm::Constant *OptionalInstanceMethodList = 1833198092Srdivacky GenerateProtocolMethodList(OptionalInstanceMethodNames, 1834198092Srdivacky OptionalInstanceMethodTypes); 1835198092Srdivacky llvm::Constant *OptionalClassMethodList = 1836198092Srdivacky GenerateProtocolMethodList(OptionalClassMethodNames, 1837198092Srdivacky OptionalClassMethodTypes); 1838198092Srdivacky 1839198092Srdivacky // Property metadata: name, attributes, isSynthesized, setter name, setter 1840198092Srdivacky // types, getter name, getter types. 1841198092Srdivacky // The isSynthesized value is always set to 0 in a protocol. It exists to 1842198092Srdivacky // simplify the runtime library by allowing it to use the same data 1843198092Srdivacky // structures for protocol metadata everywhere. 1844224145Sdim llvm::StructType *PropertyMetadataTy = llvm::StructType::get( 1845249423Sdim PtrToInt8Ty, Int8Ty, Int8Ty, Int8Ty, Int8Ty, PtrToInt8Ty, 1846276479Sdim PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty, nullptr); 1847198092Srdivacky std::vector<llvm::Constant*> Properties; 1848198092Srdivacky std::vector<llvm::Constant*> OptionalProperties; 1849198092Srdivacky 1850198092Srdivacky // Add all of the property methods need adding to the method list and to the 1851198092Srdivacky // property metadata list. 1852276479Sdim for (auto *property : PD->properties()) { 1853198092Srdivacky std::vector<llvm::Constant*> Fields; 1854198092Srdivacky 1855276479Sdim Fields.push_back(MakePropertyEncodingString(property, nullptr)); 1856249423Sdim PushPropertyAttributes(Fields, property); 1857243830Sdim 1858198092Srdivacky if (ObjCMethodDecl *getter = property->getGetterMethodDecl()) { 1859198092Srdivacky std::string TypeStr; 1860198092Srdivacky Context.getObjCEncodingForMethodDecl(getter,TypeStr); 1861198092Srdivacky llvm::Constant *TypeEncoding = MakeConstantString(TypeStr); 1862198092Srdivacky InstanceMethodTypes.push_back(TypeEncoding); 1863198092Srdivacky Fields.push_back(MakeConstantString(getter->getSelector().getAsString())); 1864198092Srdivacky Fields.push_back(TypeEncoding); 1865198092Srdivacky } else { 1866198092Srdivacky Fields.push_back(NULLPtr); 1867198092Srdivacky Fields.push_back(NULLPtr); 1868198092Srdivacky } 1869198092Srdivacky if (ObjCMethodDecl *setter = property->getSetterMethodDecl()) { 1870198092Srdivacky std::string TypeStr; 1871198092Srdivacky Context.getObjCEncodingForMethodDecl(setter,TypeStr); 1872198092Srdivacky llvm::Constant *TypeEncoding = MakeConstantString(TypeStr); 1873198092Srdivacky InstanceMethodTypes.push_back(TypeEncoding); 1874198092Srdivacky Fields.push_back(MakeConstantString(setter->getSelector().getAsString())); 1875198092Srdivacky Fields.push_back(TypeEncoding); 1876198092Srdivacky } else { 1877198092Srdivacky Fields.push_back(NULLPtr); 1878198092Srdivacky Fields.push_back(NULLPtr); 1879198092Srdivacky } 1880198092Srdivacky if (property->getPropertyImplementation() == ObjCPropertyDecl::Optional) { 1881198092Srdivacky OptionalProperties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields)); 1882198092Srdivacky } else { 1883198092Srdivacky Properties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields)); 1884198092Srdivacky } 1885198092Srdivacky } 1886198092Srdivacky llvm::Constant *PropertyArray = llvm::ConstantArray::get( 1887198092Srdivacky llvm::ArrayType::get(PropertyMetadataTy, Properties.size()), Properties); 1888198092Srdivacky llvm::Constant* PropertyListInitFields[] = 1889198092Srdivacky {llvm::ConstantInt::get(IntTy, Properties.size()), NULLPtr, PropertyArray}; 1890198092Srdivacky 1891198092Srdivacky llvm::Constant *PropertyListInit = 1892224145Sdim llvm::ConstantStruct::getAnon(PropertyListInitFields); 1893198092Srdivacky llvm::Constant *PropertyList = new llvm::GlobalVariable(TheModule, 1894198092Srdivacky PropertyListInit->getType(), false, llvm::GlobalValue::InternalLinkage, 1895198092Srdivacky PropertyListInit, ".objc_property_list"); 1896198092Srdivacky 1897198092Srdivacky llvm::Constant *OptionalPropertyArray = 1898198092Srdivacky llvm::ConstantArray::get(llvm::ArrayType::get(PropertyMetadataTy, 1899198092Srdivacky OptionalProperties.size()) , OptionalProperties); 1900198092Srdivacky llvm::Constant* OptionalPropertyListInitFields[] = { 1901198092Srdivacky llvm::ConstantInt::get(IntTy, OptionalProperties.size()), NULLPtr, 1902198092Srdivacky OptionalPropertyArray }; 1903198092Srdivacky 1904198092Srdivacky llvm::Constant *OptionalPropertyListInit = 1905224145Sdim llvm::ConstantStruct::getAnon(OptionalPropertyListInitFields); 1906198092Srdivacky llvm::Constant *OptionalPropertyList = new llvm::GlobalVariable(TheModule, 1907198092Srdivacky OptionalPropertyListInit->getType(), false, 1908198092Srdivacky llvm::GlobalValue::InternalLinkage, OptionalPropertyListInit, 1909198092Srdivacky ".objc_property_list"); 1910198092Srdivacky 1911193326Sed // Protocols are objects containing lists of the methods implemented and 1912193326Sed // protocols adopted. 1913224145Sdim llvm::StructType *ProtocolTy = llvm::StructType::get(IdTy, 1914193326Sed PtrToInt8Ty, 1915193326Sed ProtocolList->getType(), 1916193326Sed InstanceMethodList->getType(), 1917193326Sed ClassMethodList->getType(), 1918198092Srdivacky OptionalInstanceMethodList->getType(), 1919198092Srdivacky OptionalClassMethodList->getType(), 1920198092Srdivacky PropertyList->getType(), 1921198092Srdivacky OptionalPropertyList->getType(), 1922276479Sdim nullptr); 1923198092Srdivacky std::vector<llvm::Constant*> Elements; 1924193326Sed // The isa pointer must be set to a magic number so the runtime knows it's 1925193326Sed // the correct layout. 1926193326Sed Elements.push_back(llvm::ConstantExpr::getIntToPtr( 1927226633Sdim llvm::ConstantInt::get(Int32Ty, ProtocolVersion), IdTy)); 1928193326Sed Elements.push_back(MakeConstantString(ProtocolName, ".objc_protocol_name")); 1929193326Sed Elements.push_back(ProtocolList); 1930193326Sed Elements.push_back(InstanceMethodList); 1931193326Sed Elements.push_back(ClassMethodList); 1932198092Srdivacky Elements.push_back(OptionalInstanceMethodList); 1933198092Srdivacky Elements.push_back(OptionalClassMethodList); 1934198092Srdivacky Elements.push_back(PropertyList); 1935198092Srdivacky Elements.push_back(OptionalPropertyList); 1936198092Srdivacky ExistingProtocols[ProtocolName] = 1937193326Sed llvm::ConstantExpr::getBitCast(MakeGlobal(ProtocolTy, Elements, 1938296417Sdim CGM.getPointerAlign(), ".objc_protocol"), IdTy); 1939193326Sed} 1940249423Sdimvoid CGObjCGNU::GenerateProtocolHolderCategory() { 1941198092Srdivacky // Collect information about instance methods 1942226633Sdim SmallVector<Selector, 1> MethodSels; 1943226633Sdim SmallVector<llvm::Constant*, 1> MethodTypes; 1944193326Sed 1945198092Srdivacky std::vector<llvm::Constant*> Elements; 1946198092Srdivacky const std::string ClassName = "__ObjC_Protocol_Holder_Ugly_Hack"; 1947198092Srdivacky const std::string CategoryName = "AnotherHack"; 1948198092Srdivacky Elements.push_back(MakeConstantString(CategoryName)); 1949198092Srdivacky Elements.push_back(MakeConstantString(ClassName)); 1950198092Srdivacky // Instance method list 1951198092Srdivacky Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList( 1952198092Srdivacky ClassName, CategoryName, MethodSels, MethodTypes, false), PtrTy)); 1953198092Srdivacky // Class method list 1954198092Srdivacky Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList( 1955198092Srdivacky ClassName, CategoryName, MethodSels, MethodTypes, true), PtrTy)); 1956198092Srdivacky // Protocol list 1957198092Srdivacky llvm::ArrayType *ProtocolArrayTy = llvm::ArrayType::get(PtrTy, 1958198092Srdivacky ExistingProtocols.size()); 1959224145Sdim llvm::StructType *ProtocolListTy = llvm::StructType::get( 1960198092Srdivacky PtrTy, //Should be a recurisve pointer, but it's always NULL here. 1961218893Sdim SizeTy, 1962198092Srdivacky ProtocolArrayTy, 1963276479Sdim nullptr); 1964198092Srdivacky std::vector<llvm::Constant*> ProtocolElements; 1965198092Srdivacky for (llvm::StringMapIterator<llvm::Constant*> iter = 1966198092Srdivacky ExistingProtocols.begin(), endIter = ExistingProtocols.end(); 1967198092Srdivacky iter != endIter ; iter++) { 1968198092Srdivacky llvm::Constant *Ptr = llvm::ConstantExpr::getBitCast(iter->getValue(), 1969198092Srdivacky PtrTy); 1970198092Srdivacky ProtocolElements.push_back(Ptr); 1971198092Srdivacky } 1972198092Srdivacky llvm::Constant * ProtocolArray = llvm::ConstantArray::get(ProtocolArrayTy, 1973198092Srdivacky ProtocolElements); 1974198092Srdivacky ProtocolElements.clear(); 1975198092Srdivacky ProtocolElements.push_back(NULLPtr); 1976198092Srdivacky ProtocolElements.push_back(llvm::ConstantInt::get(LongTy, 1977198092Srdivacky ExistingProtocols.size())); 1978198092Srdivacky ProtocolElements.push_back(ProtocolArray); 1979198092Srdivacky Elements.push_back(llvm::ConstantExpr::getBitCast(MakeGlobal(ProtocolListTy, 1980296417Sdim ProtocolElements, CGM.getPointerAlign(), 1981296417Sdim ".objc_protocol_list"), PtrTy)); 1982198092Srdivacky Categories.push_back(llvm::ConstantExpr::getBitCast( 1983224145Sdim MakeGlobal(llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, 1984296417Sdim PtrTy, PtrTy, PtrTy, nullptr), Elements, CGM.getPointerAlign()), 1985296417Sdim PtrTy)); 1986198092Srdivacky} 1987198092Srdivacky 1988226633Sdim/// Libobjc2 uses a bitfield representation where small(ish) bitfields are 1989226633Sdim/// stored in a 64-bit value with the low bit set to 1 and the remaining 63 1990226633Sdim/// bits set to their values, LSB first, while larger ones are stored in a 1991226633Sdim/// structure of this / form: 1992226633Sdim/// 1993226633Sdim/// struct { int32_t length; int32_t values[length]; }; 1994226633Sdim/// 1995226633Sdim/// The values in the array are stored in host-endian format, with the least 1996226633Sdim/// significant bit being assumed to come first in the bitfield. Therefore, a 1997226633Sdim/// bitfield with the 64th bit set will be (int64_t)&{ 2, [0, 1<<31] }, while a 1998226633Sdim/// bitfield / with the 63rd bit set will be 1<<64. 1999234353Sdimllvm::Constant *CGObjCGNU::MakeBitField(ArrayRef<bool> bits) { 2000226633Sdim int bitCount = bits.size(); 2001276479Sdim int ptrBits = CGM.getDataLayout().getPointerSizeInBits(); 2002228379Sdim if (bitCount < ptrBits) { 2003226633Sdim uint64_t val = 1; 2004226633Sdim for (int i=0 ; i<bitCount ; ++i) { 2005226633Sdim if (bits[i]) val |= 1ULL<<(i+1); 2006226633Sdim } 2007228379Sdim return llvm::ConstantInt::get(IntPtrTy, val); 2008226633Sdim } 2009249423Sdim SmallVector<llvm::Constant *, 8> values; 2010226633Sdim int v=0; 2011226633Sdim while (v < bitCount) { 2012226633Sdim int32_t word = 0; 2013226633Sdim for (int i=0 ; (i<32) && (v<bitCount) ; ++i) { 2014226633Sdim if (bits[v]) word |= 1<<i; 2015226633Sdim v++; 2016226633Sdim } 2017226633Sdim values.push_back(llvm::ConstantInt::get(Int32Ty, word)); 2018226633Sdim } 2019226633Sdim llvm::ArrayType *arrayTy = llvm::ArrayType::get(Int32Ty, values.size()); 2020226633Sdim llvm::Constant *array = llvm::ConstantArray::get(arrayTy, values); 2021226633Sdim llvm::Constant *fields[2] = { 2022226633Sdim llvm::ConstantInt::get(Int32Ty, values.size()), 2023226633Sdim array }; 2024226633Sdim llvm::Constant *GS = MakeGlobal(llvm::StructType::get(Int32Ty, arrayTy, 2025296417Sdim nullptr), fields, CharUnits::fromQuantity(4)); 2026226633Sdim llvm::Constant *ptr = llvm::ConstantExpr::getPtrToInt(GS, IntPtrTy); 2027226633Sdim return ptr; 2028226633Sdim} 2029226633Sdim 2030193326Sedvoid CGObjCGNU::GenerateCategory(const ObjCCategoryImplDecl *OCD) { 2031193326Sed std::string ClassName = OCD->getClassInterface()->getNameAsString(); 2032193326Sed std::string CategoryName = OCD->getNameAsString(); 2033193326Sed // Collect information about instance methods 2034226633Sdim SmallVector<Selector, 16> InstanceMethodSels; 2035226633Sdim SmallVector<llvm::Constant*, 16> InstanceMethodTypes; 2036276479Sdim for (const auto *I : OCD->instance_methods()) { 2037276479Sdim InstanceMethodSels.push_back(I->getSelector()); 2038193326Sed std::string TypeStr; 2039276479Sdim CGM.getContext().getObjCEncodingForMethodDecl(I,TypeStr); 2040198092Srdivacky InstanceMethodTypes.push_back(MakeConstantString(TypeStr)); 2041193326Sed } 2042193326Sed 2043193326Sed // Collect information about class methods 2044226633Sdim SmallVector<Selector, 16> ClassMethodSels; 2045226633Sdim SmallVector<llvm::Constant*, 16> ClassMethodTypes; 2046276479Sdim for (const auto *I : OCD->class_methods()) { 2047276479Sdim ClassMethodSels.push_back(I->getSelector()); 2048193326Sed std::string TypeStr; 2049276479Sdim CGM.getContext().getObjCEncodingForMethodDecl(I,TypeStr); 2050198092Srdivacky ClassMethodTypes.push_back(MakeConstantString(TypeStr)); 2051193326Sed } 2052193326Sed 2053193326Sed // Collect the names of referenced protocols 2054226633Sdim SmallVector<std::string, 16> Protocols; 2055205219Srdivacky const ObjCCategoryDecl *CatDecl = OCD->getCategoryDecl(); 2056205219Srdivacky const ObjCList<ObjCProtocolDecl> &Protos = CatDecl->getReferencedProtocols(); 2057193326Sed for (ObjCList<ObjCProtocolDecl>::iterator I = Protos.begin(), 2058193326Sed E = Protos.end(); I != E; ++I) 2059193326Sed Protocols.push_back((*I)->getNameAsString()); 2060193326Sed 2061193326Sed std::vector<llvm::Constant*> Elements; 2062193326Sed Elements.push_back(MakeConstantString(CategoryName)); 2063193326Sed Elements.push_back(MakeConstantString(ClassName)); 2064198092Srdivacky // Instance method list 2065193326Sed Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList( 2066193326Sed ClassName, CategoryName, InstanceMethodSels, InstanceMethodTypes, 2067193326Sed false), PtrTy)); 2068193326Sed // Class method list 2069193326Sed Elements.push_back(llvm::ConstantExpr::getBitCast(GenerateMethodList( 2070193326Sed ClassName, CategoryName, ClassMethodSels, ClassMethodTypes, true), 2071193326Sed PtrTy)); 2072193326Sed // Protocol list 2073193326Sed Elements.push_back(llvm::ConstantExpr::getBitCast( 2074193326Sed GenerateProtocolList(Protocols), PtrTy)); 2075193326Sed Categories.push_back(llvm::ConstantExpr::getBitCast( 2076224145Sdim MakeGlobal(llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, 2077296417Sdim PtrTy, PtrTy, PtrTy, nullptr), Elements, CGM.getPointerAlign()), 2078296417Sdim PtrTy)); 2079193326Sed} 2080193326Sed 2081198092Srdivackyllvm::Constant *CGObjCGNU::GeneratePropertyList(const ObjCImplementationDecl *OID, 2082226633Sdim SmallVectorImpl<Selector> &InstanceMethodSels, 2083226633Sdim SmallVectorImpl<llvm::Constant*> &InstanceMethodTypes) { 2084198092Srdivacky ASTContext &Context = CGM.getContext(); 2085249423Sdim // Property metadata: name, attributes, attributes2, padding1, padding2, 2086249423Sdim // setter name, setter types, getter name, getter types. 2087224145Sdim llvm::StructType *PropertyMetadataTy = llvm::StructType::get( 2088249423Sdim PtrToInt8Ty, Int8Ty, Int8Ty, Int8Ty, Int8Ty, PtrToInt8Ty, 2089276479Sdim PtrToInt8Ty, PtrToInt8Ty, PtrToInt8Ty, nullptr); 2090198092Srdivacky std::vector<llvm::Constant*> Properties; 2091198092Srdivacky 2092198092Srdivacky // Add all of the property methods need adding to the method list and to the 2093198092Srdivacky // property metadata list. 2094276479Sdim for (auto *propertyImpl : OID->property_impls()) { 2095198092Srdivacky std::vector<llvm::Constant*> Fields; 2096276479Sdim ObjCPropertyDecl *property = propertyImpl->getPropertyDecl(); 2097204643Srdivacky bool isSynthesized = (propertyImpl->getPropertyImplementation() == 2098204643Srdivacky ObjCPropertyImplDecl::Synthesize); 2099249423Sdim bool isDynamic = (propertyImpl->getPropertyImplementation() == 2100249423Sdim ObjCPropertyImplDecl::Dynamic); 2101198092Srdivacky 2102243830Sdim Fields.push_back(MakePropertyEncodingString(property, OID)); 2103249423Sdim PushPropertyAttributes(Fields, property, isSynthesized, isDynamic); 2104198092Srdivacky if (ObjCMethodDecl *getter = property->getGetterMethodDecl()) { 2105198092Srdivacky std::string TypeStr; 2106198092Srdivacky Context.getObjCEncodingForMethodDecl(getter,TypeStr); 2107198092Srdivacky llvm::Constant *TypeEncoding = MakeConstantString(TypeStr); 2108204643Srdivacky if (isSynthesized) { 2109204643Srdivacky InstanceMethodTypes.push_back(TypeEncoding); 2110204643Srdivacky InstanceMethodSels.push_back(getter->getSelector()); 2111204643Srdivacky } 2112198092Srdivacky Fields.push_back(MakeConstantString(getter->getSelector().getAsString())); 2113198092Srdivacky Fields.push_back(TypeEncoding); 2114198092Srdivacky } else { 2115198092Srdivacky Fields.push_back(NULLPtr); 2116198092Srdivacky Fields.push_back(NULLPtr); 2117198092Srdivacky } 2118198092Srdivacky if (ObjCMethodDecl *setter = property->getSetterMethodDecl()) { 2119198092Srdivacky std::string TypeStr; 2120198092Srdivacky Context.getObjCEncodingForMethodDecl(setter,TypeStr); 2121198092Srdivacky llvm::Constant *TypeEncoding = MakeConstantString(TypeStr); 2122204643Srdivacky if (isSynthesized) { 2123204643Srdivacky InstanceMethodTypes.push_back(TypeEncoding); 2124204643Srdivacky InstanceMethodSels.push_back(setter->getSelector()); 2125204643Srdivacky } 2126198092Srdivacky Fields.push_back(MakeConstantString(setter->getSelector().getAsString())); 2127198092Srdivacky Fields.push_back(TypeEncoding); 2128198092Srdivacky } else { 2129198092Srdivacky Fields.push_back(NULLPtr); 2130198092Srdivacky Fields.push_back(NULLPtr); 2131198092Srdivacky } 2132198092Srdivacky Properties.push_back(llvm::ConstantStruct::get(PropertyMetadataTy, Fields)); 2133198092Srdivacky } 2134198092Srdivacky llvm::ArrayType *PropertyArrayTy = 2135198092Srdivacky llvm::ArrayType::get(PropertyMetadataTy, Properties.size()); 2136198092Srdivacky llvm::Constant *PropertyArray = llvm::ConstantArray::get(PropertyArrayTy, 2137198092Srdivacky Properties); 2138198092Srdivacky llvm::Constant* PropertyListInitFields[] = 2139198092Srdivacky {llvm::ConstantInt::get(IntTy, Properties.size()), NULLPtr, PropertyArray}; 2140198092Srdivacky 2141198092Srdivacky llvm::Constant *PropertyListInit = 2142224145Sdim llvm::ConstantStruct::getAnon(PropertyListInitFields); 2143198092Srdivacky return new llvm::GlobalVariable(TheModule, PropertyListInit->getType(), false, 2144198092Srdivacky llvm::GlobalValue::InternalLinkage, PropertyListInit, 2145198092Srdivacky ".objc_property_list"); 2146198092Srdivacky} 2147198092Srdivacky 2148234353Sdimvoid CGObjCGNU::RegisterAlias(const ObjCCompatibleAliasDecl *OAD) { 2149234353Sdim // Get the class declaration for which the alias is specified. 2150234353Sdim ObjCInterfaceDecl *ClassDecl = 2151234353Sdim const_cast<ObjCInterfaceDecl *>(OAD->getClassInterface()); 2152288943Sdim ClassAliases.emplace_back(ClassDecl->getNameAsString(), 2153288943Sdim OAD->getNameAsString()); 2154234353Sdim} 2155234353Sdim 2156193326Sedvoid CGObjCGNU::GenerateClass(const ObjCImplementationDecl *OID) { 2157193326Sed ASTContext &Context = CGM.getContext(); 2158193326Sed 2159193326Sed // Get the superclass name. 2160198092Srdivacky const ObjCInterfaceDecl * SuperClassDecl = 2161193326Sed OID->getClassInterface()->getSuperClass(); 2162193326Sed std::string SuperClassName; 2163194613Sed if (SuperClassDecl) { 2164193326Sed SuperClassName = SuperClassDecl->getNameAsString(); 2165194613Sed EmitClassRef(SuperClassName); 2166194613Sed } 2167193326Sed 2168193326Sed // Get the class name 2169193326Sed ObjCInterfaceDecl *ClassDecl = 2170193326Sed const_cast<ObjCInterfaceDecl *>(OID->getClassInterface()); 2171193326Sed std::string ClassName = ClassDecl->getNameAsString(); 2172194613Sed // Emit the symbol that is used to generate linker errors if this class is 2173194613Sed // referenced in other modules but not declared. 2174195341Sed std::string classSymbolName = "__objc_class_name_" + ClassName; 2175198092Srdivacky if (llvm::GlobalVariable *symbol = 2176195341Sed TheModule.getGlobalVariable(classSymbolName)) { 2177195341Sed symbol->setInitializer(llvm::ConstantInt::get(LongTy, 0)); 2178195341Sed } else { 2179198092Srdivacky new llvm::GlobalVariable(TheModule, LongTy, false, 2180198092Srdivacky llvm::GlobalValue::ExternalLinkage, llvm::ConstantInt::get(LongTy, 0), 2181198092Srdivacky classSymbolName); 2182195341Sed } 2183198092Srdivacky 2184193326Sed // Get the size of instances. 2185218893Sdim int instanceSize = 2186218893Sdim Context.getASTObjCImplementationLayout(OID).getSize().getQuantity(); 2187193326Sed 2188193326Sed // Collect information about instance variables. 2189226633Sdim SmallVector<llvm::Constant*, 16> IvarNames; 2190226633Sdim SmallVector<llvm::Constant*, 16> IvarTypes; 2191226633Sdim SmallVector<llvm::Constant*, 16> IvarOffsets; 2192198092Srdivacky 2193198092Srdivacky std::vector<llvm::Constant*> IvarOffsetValues; 2194226633Sdim SmallVector<bool, 16> WeakIvars; 2195226633Sdim SmallVector<bool, 16> StrongIvars; 2196198092Srdivacky 2197198092Srdivacky int superInstanceSize = !SuperClassDecl ? 0 : 2198218893Sdim Context.getASTObjCInterfaceLayout(SuperClassDecl).getSize().getQuantity(); 2199193326Sed // For non-fragile ivars, set the instance size to 0 - {the size of just this 2200193326Sed // class}. The runtime will then set this to the correct value on load. 2201243830Sdim if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) { 2202193326Sed instanceSize = 0 - (instanceSize - superInstanceSize); 2203193326Sed } 2204207619Srdivacky 2205226633Sdim for (const ObjCIvarDecl *IVD = ClassDecl->all_declared_ivar_begin(); IVD; 2206226633Sdim IVD = IVD->getNextIvar()) { 2207193326Sed // Store the name 2208207619Srdivacky IvarNames.push_back(MakeConstantString(IVD->getNameAsString())); 2209193326Sed // Get the type encoding for this ivar 2210193326Sed std::string TypeStr; 2211207619Srdivacky Context.getObjCEncodingForType(IVD->getType(), TypeStr); 2212198092Srdivacky IvarTypes.push_back(MakeConstantString(TypeStr)); 2213193326Sed // Get the offset 2214207619Srdivacky uint64_t BaseOffset = ComputeIvarBaseOffset(CGM, OID, IVD); 2215199482Srdivacky uint64_t Offset = BaseOffset; 2216243830Sdim if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) { 2217198092Srdivacky Offset = BaseOffset - superInstanceSize; 2218193326Sed } 2219224145Sdim llvm::Constant *OffsetValue = llvm::ConstantInt::get(IntTy, Offset); 2220224145Sdim // Create the direct offset value 2221224145Sdim std::string OffsetName = "__objc_ivar_offset_value_" + ClassName +"." + 2222224145Sdim IVD->getNameAsString(); 2223224145Sdim llvm::GlobalVariable *OffsetVar = TheModule.getGlobalVariable(OffsetName); 2224224145Sdim if (OffsetVar) { 2225224145Sdim OffsetVar->setInitializer(OffsetValue); 2226224145Sdim // If this is the real definition, change its linkage type so that 2227224145Sdim // different modules will use this one, rather than their private 2228224145Sdim // copy. 2229224145Sdim OffsetVar->setLinkage(llvm::GlobalValue::ExternalLinkage); 2230224145Sdim } else 2231224145Sdim OffsetVar = new llvm::GlobalVariable(TheModule, IntTy, 2232198092Srdivacky false, llvm::GlobalValue::ExternalLinkage, 2233224145Sdim OffsetValue, 2234198092Srdivacky "__objc_ivar_offset_value_" + ClassName +"." + 2235224145Sdim IVD->getNameAsString()); 2236224145Sdim IvarOffsets.push_back(OffsetValue); 2237224145Sdim IvarOffsetValues.push_back(OffsetVar); 2238226633Sdim Qualifiers::ObjCLifetime lt = IVD->getType().getQualifiers().getObjCLifetime(); 2239226633Sdim switch (lt) { 2240226633Sdim case Qualifiers::OCL_Strong: 2241226633Sdim StrongIvars.push_back(true); 2242226633Sdim WeakIvars.push_back(false); 2243226633Sdim break; 2244226633Sdim case Qualifiers::OCL_Weak: 2245226633Sdim StrongIvars.push_back(false); 2246226633Sdim WeakIvars.push_back(true); 2247226633Sdim break; 2248226633Sdim default: 2249226633Sdim StrongIvars.push_back(false); 2250226633Sdim WeakIvars.push_back(false); 2251226633Sdim } 2252193326Sed } 2253226633Sdim llvm::Constant *StrongIvarBitmap = MakeBitField(StrongIvars); 2254226633Sdim llvm::Constant *WeakIvarBitmap = MakeBitField(WeakIvars); 2255221345Sdim llvm::GlobalVariable *IvarOffsetArray = 2256296417Sdim MakeGlobalArray(PtrToIntTy, IvarOffsetValues, CGM.getPointerAlign(), 2257296417Sdim ".ivar.offsets"); 2258193326Sed 2259221345Sdim 2260193326Sed // Collect information about instance methods 2261226633Sdim SmallVector<Selector, 16> InstanceMethodSels; 2262226633Sdim SmallVector<llvm::Constant*, 16> InstanceMethodTypes; 2263276479Sdim for (const auto *I : OID->instance_methods()) { 2264276479Sdim InstanceMethodSels.push_back(I->getSelector()); 2265193326Sed std::string TypeStr; 2266276479Sdim Context.getObjCEncodingForMethodDecl(I,TypeStr); 2267198092Srdivacky InstanceMethodTypes.push_back(MakeConstantString(TypeStr)); 2268193326Sed } 2269193326Sed 2270198092Srdivacky llvm::Constant *Properties = GeneratePropertyList(OID, InstanceMethodSels, 2271198092Srdivacky InstanceMethodTypes); 2272198092Srdivacky 2273198092Srdivacky 2274193326Sed // Collect information about class methods 2275226633Sdim SmallVector<Selector, 16> ClassMethodSels; 2276226633Sdim SmallVector<llvm::Constant*, 16> ClassMethodTypes; 2277276479Sdim for (const auto *I : OID->class_methods()) { 2278276479Sdim ClassMethodSels.push_back(I->getSelector()); 2279193326Sed std::string TypeStr; 2280276479Sdim Context.getObjCEncodingForMethodDecl(I,TypeStr); 2281198092Srdivacky ClassMethodTypes.push_back(MakeConstantString(TypeStr)); 2282193326Sed } 2283193326Sed // Collect the names of referenced protocols 2284226633Sdim SmallVector<std::string, 16> Protocols; 2285276479Sdim for (const auto *I : ClassDecl->protocols()) 2286276479Sdim Protocols.push_back(I->getNameAsString()); 2287193326Sed 2288193326Sed // Get the superclass pointer. 2289193326Sed llvm::Constant *SuperClass; 2290193326Sed if (!SuperClassName.empty()) { 2291193326Sed SuperClass = MakeConstantString(SuperClassName, ".super_class_name"); 2292193326Sed } else { 2293193326Sed SuperClass = llvm::ConstantPointerNull::get(PtrToInt8Ty); 2294193326Sed } 2295193326Sed // Empty vector used to construct empty method lists 2296226633Sdim SmallVector<llvm::Constant*, 1> empty; 2297193326Sed // Generate the method and instance variable lists 2298193326Sed llvm::Constant *MethodList = GenerateMethodList(ClassName, "", 2299193326Sed InstanceMethodSels, InstanceMethodTypes, false); 2300193326Sed llvm::Constant *ClassMethodList = GenerateMethodList(ClassName, "", 2301193326Sed ClassMethodSels, ClassMethodTypes, true); 2302193326Sed llvm::Constant *IvarList = GenerateIvarList(IvarNames, IvarTypes, 2303193326Sed IvarOffsets); 2304198092Srdivacky // Irrespective of whether we are compiling for a fragile or non-fragile ABI, 2305198092Srdivacky // we emit a symbol containing the offset for each ivar in the class. This 2306198092Srdivacky // allows code compiled for the non-Fragile ABI to inherit from code compiled 2307198092Srdivacky // for the legacy ABI, without causing problems. The converse is also 2308198092Srdivacky // possible, but causes all ivar accesses to be fragile. 2309218893Sdim 2310198092Srdivacky // Offset pointer for getting at the correct field in the ivar list when 2311198092Srdivacky // setting up the alias. These are: The base address for the global, the 2312198092Srdivacky // ivar array (second field), the ivar in this list (set for each ivar), and 2313198092Srdivacky // the offset (third field in ivar structure) 2314226633Sdim llvm::Type *IndexTy = Int32Ty; 2315198092Srdivacky llvm::Constant *offsetPointerIndexes[] = {Zeros[0], 2316276479Sdim llvm::ConstantInt::get(IndexTy, 1), nullptr, 2317198092Srdivacky llvm::ConstantInt::get(IndexTy, 2) }; 2318198092Srdivacky 2319226633Sdim unsigned ivarIndex = 0; 2320226633Sdim for (const ObjCIvarDecl *IVD = ClassDecl->all_declared_ivar_begin(); IVD; 2321226633Sdim IVD = IVD->getNextIvar()) { 2322198092Srdivacky const std::string Name = "__objc_ivar_offset_" + ClassName + '.' 2323218893Sdim + IVD->getNameAsString(); 2324226633Sdim offsetPointerIndexes[2] = llvm::ConstantInt::get(IndexTy, ivarIndex); 2325198092Srdivacky // Get the correct ivar field 2326198092Srdivacky llvm::Constant *offsetValue = llvm::ConstantExpr::getGetElementPtr( 2327288943Sdim cast<llvm::GlobalVariable>(IvarList)->getValueType(), IvarList, 2328288943Sdim offsetPointerIndexes); 2329218893Sdim // Get the existing variable, if one exists. 2330198092Srdivacky llvm::GlobalVariable *offset = TheModule.getNamedGlobal(Name); 2331198092Srdivacky if (offset) { 2332234353Sdim offset->setInitializer(offsetValue); 2333234353Sdim // If this is the real definition, change its linkage type so that 2334234353Sdim // different modules will use this one, rather than their private 2335234353Sdim // copy. 2336234353Sdim offset->setLinkage(llvm::GlobalValue::ExternalLinkage); 2337198092Srdivacky } else { 2338234353Sdim // Add a new alias if there isn't one already. 2339234353Sdim offset = new llvm::GlobalVariable(TheModule, offsetValue->getType(), 2340234353Sdim false, llvm::GlobalValue::ExternalLinkage, offsetValue, Name); 2341234353Sdim (void) offset; // Silence dead store warning. 2342198092Srdivacky } 2343226633Sdim ++ivarIndex; 2344198092Srdivacky } 2345228379Sdim llvm::Constant *ZeroPtr = llvm::ConstantInt::get(IntPtrTy, 0); 2346193326Sed //Generate metaclass for class methods 2347193326Sed llvm::Constant *MetaClassStruct = GenerateClassStructure(NULLPtr, 2348276479Sdim NULLPtr, 0x12L, ClassName.c_str(), nullptr, Zeros[0], GenerateIvarList( 2349226633Sdim empty, empty, empty), ClassMethodList, NULLPtr, 2350228379Sdim NULLPtr, NULLPtr, ZeroPtr, ZeroPtr, true); 2351193326Sed 2352193326Sed // Generate the class structure 2353193326Sed llvm::Constant *ClassStruct = 2354198092Srdivacky GenerateClassStructure(MetaClassStruct, SuperClass, 0x11L, 2355276479Sdim ClassName.c_str(), nullptr, 2356193326Sed llvm::ConstantInt::get(LongTy, instanceSize), IvarList, 2357198092Srdivacky MethodList, GenerateProtocolList(Protocols), IvarOffsetArray, 2358226633Sdim Properties, StrongIvarBitmap, WeakIvarBitmap); 2359193326Sed 2360193326Sed // Resolve the class aliases, if they exist. 2361193326Sed if (ClassPtrAlias) { 2362218893Sdim ClassPtrAlias->replaceAllUsesWith( 2363193326Sed llvm::ConstantExpr::getBitCast(ClassStruct, IdTy)); 2364218893Sdim ClassPtrAlias->eraseFromParent(); 2365276479Sdim ClassPtrAlias = nullptr; 2366193326Sed } 2367193326Sed if (MetaClassPtrAlias) { 2368218893Sdim MetaClassPtrAlias->replaceAllUsesWith( 2369193326Sed llvm::ConstantExpr::getBitCast(MetaClassStruct, IdTy)); 2370218893Sdim MetaClassPtrAlias->eraseFromParent(); 2371276479Sdim MetaClassPtrAlias = nullptr; 2372193326Sed } 2373193326Sed 2374193326Sed // Add class structure to list to be added to the symtab later 2375193326Sed ClassStruct = llvm::ConstantExpr::getBitCast(ClassStruct, PtrToInt8Ty); 2376193326Sed Classes.push_back(ClassStruct); 2377193326Sed} 2378193326Sed 2379195099Sed 2380198092Srdivackyllvm::Function *CGObjCGNU::ModuleInitFunction() { 2381193326Sed // Only emit an ObjC load function if no Objective-C stuff has been called 2382193326Sed if (Classes.empty() && Categories.empty() && ConstantStrings.empty() && 2383221345Sdim ExistingProtocols.empty() && SelectorTable.empty()) 2384276479Sdim return nullptr; 2385193326Sed 2386198092Srdivacky // Add all referenced protocols to a category. 2387198092Srdivacky GenerateProtocolHolderCategory(); 2388198092Srdivacky 2389226633Sdim llvm::StructType *SelStructTy = dyn_cast<llvm::StructType>( 2390193326Sed SelectorTy->getElementType()); 2391224145Sdim llvm::Type *SelStructPtrTy = SelectorTy; 2392276479Sdim if (!SelStructTy) { 2393276479Sdim SelStructTy = llvm::StructType::get(PtrToInt8Ty, PtrToInt8Ty, nullptr); 2394193326Sed SelStructPtrTy = llvm::PointerType::getUnqual(SelStructTy); 2395193326Sed } 2396193326Sed 2397193326Sed std::vector<llvm::Constant*> Elements; 2398193326Sed llvm::Constant *Statics = NULLPtr; 2399193326Sed // Generate statics list: 2400288943Sdim if (!ConstantStrings.empty()) { 2401193326Sed llvm::ArrayType *StaticsArrayTy = llvm::ArrayType::get(PtrToInt8Ty, 2402193326Sed ConstantStrings.size() + 1); 2403193326Sed ConstantStrings.push_back(NULLPtr); 2404198092Srdivacky 2405234353Sdim StringRef StringClass = CGM.getLangOpts().ObjCConstantStringClass; 2406221345Sdim 2407199990Srdivacky if (StringClass.empty()) StringClass = "NXConstantString"; 2408221345Sdim 2409198092Srdivacky Elements.push_back(MakeConstantString(StringClass, 2410198092Srdivacky ".objc_static_class_name")); 2411193326Sed Elements.push_back(llvm::ConstantArray::get(StaticsArrayTy, 2412193326Sed ConstantStrings)); 2413198092Srdivacky llvm::StructType *StaticsListTy = 2414276479Sdim llvm::StructType::get(PtrToInt8Ty, StaticsArrayTy, nullptr); 2415198092Srdivacky llvm::Type *StaticsListPtrTy = 2416198092Srdivacky llvm::PointerType::getUnqual(StaticsListTy); 2417296417Sdim Statics = MakeGlobal(StaticsListTy, Elements, CGM.getPointerAlign(), 2418296417Sdim ".objc_statics"); 2419193326Sed llvm::ArrayType *StaticsListArrayTy = 2420193326Sed llvm::ArrayType::get(StaticsListPtrTy, 2); 2421193326Sed Elements.clear(); 2422193326Sed Elements.push_back(Statics); 2423193326Sed Elements.push_back(llvm::Constant::getNullValue(StaticsListPtrTy)); 2424296417Sdim Statics = MakeGlobal(StaticsListArrayTy, Elements, 2425296417Sdim CGM.getPointerAlign(), ".objc_statics_ptr"); 2426193326Sed Statics = llvm::ConstantExpr::getBitCast(Statics, PtrTy); 2427193326Sed } 2428193326Sed // Array of classes, categories, and constant objects 2429193326Sed llvm::ArrayType *ClassListTy = llvm::ArrayType::get(PtrToInt8Ty, 2430193326Sed Classes.size() + Categories.size() + 2); 2431224145Sdim llvm::StructType *SymTabTy = llvm::StructType::get(LongTy, SelStructPtrTy, 2432198092Srdivacky llvm::Type::getInt16Ty(VMContext), 2433198092Srdivacky llvm::Type::getInt16Ty(VMContext), 2434276479Sdim ClassListTy, nullptr); 2435193326Sed 2436193326Sed Elements.clear(); 2437193326Sed // Pointer to an array of selectors used in this module. 2438193326Sed std::vector<llvm::Constant*> Selectors; 2439221345Sdim std::vector<llvm::GlobalAlias*> SelectorAliases; 2440221345Sdim for (SelectorMap::iterator iter = SelectorTable.begin(), 2441221345Sdim iterEnd = SelectorTable.end(); iter != iterEnd ; ++iter) { 2442221345Sdim 2443221345Sdim std::string SelNameStr = iter->first.getAsString(); 2444221345Sdim llvm::Constant *SelName = ExportUniqueString(SelNameStr, ".objc_sel_name"); 2445221345Sdim 2446226633Sdim SmallVectorImpl<TypedSelector> &Types = iter->second; 2447226633Sdim for (SmallVectorImpl<TypedSelector>::iterator i = Types.begin(), 2448221345Sdim e = Types.end() ; i!=e ; i++) { 2449221345Sdim 2450221345Sdim llvm::Constant *SelectorTypeEncoding = NULLPtr; 2451221345Sdim if (!i->first.empty()) 2452221345Sdim SelectorTypeEncoding = MakeConstantString(i->first, ".objc_sel_types"); 2453221345Sdim 2454221345Sdim Elements.push_back(SelName); 2455221345Sdim Elements.push_back(SelectorTypeEncoding); 2456221345Sdim Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements)); 2457221345Sdim Elements.clear(); 2458221345Sdim 2459221345Sdim // Store the selector alias for later replacement 2460221345Sdim SelectorAliases.push_back(i->second); 2461221345Sdim } 2462193326Sed } 2463221345Sdim unsigned SelectorCount = Selectors.size(); 2464221345Sdim // NULL-terminate the selector list. This should not actually be required, 2465221345Sdim // because the selector list has a length field. Unfortunately, the GCC 2466221345Sdim // runtime decides to ignore the length field and expects a NULL terminator, 2467221345Sdim // and GCC cooperates with this by always setting the length to 0. 2468193326Sed Elements.push_back(NULLPtr); 2469193326Sed Elements.push_back(NULLPtr); 2470193326Sed Selectors.push_back(llvm::ConstantStruct::get(SelStructTy, Elements)); 2471193326Sed Elements.clear(); 2472221345Sdim 2473193326Sed // Number of static selectors 2474221345Sdim Elements.push_back(llvm::ConstantInt::get(LongTy, SelectorCount)); 2475288943Sdim llvm::GlobalVariable *SelectorList = 2476296417Sdim MakeGlobalArray(SelStructTy, Selectors, CGM.getPointerAlign(), 2477296417Sdim ".objc_selector_list"); 2478198092Srdivacky Elements.push_back(llvm::ConstantExpr::getBitCast(SelectorList, 2479193326Sed SelStructPtrTy)); 2480193326Sed 2481193326Sed // Now that all of the static selectors exist, create pointers to them. 2482221345Sdim for (unsigned int i=0 ; i<SelectorCount ; i++) { 2483221345Sdim 2484193326Sed llvm::Constant *Idxs[] = {Zeros[0], 2485226633Sdim llvm::ConstantInt::get(Int32Ty, i), Zeros[0]}; 2486221345Sdim // FIXME: We're generating redundant loads and stores here! 2487288943Sdim llvm::Constant *SelPtr = llvm::ConstantExpr::getGetElementPtr( 2488288943Sdim SelectorList->getValueType(), SelectorList, makeArrayRef(Idxs, 2)); 2489193326Sed // If selectors are defined as an opaque type, cast the pointer to this 2490193326Sed // type. 2491221345Sdim SelPtr = llvm::ConstantExpr::getBitCast(SelPtr, SelectorTy); 2492221345Sdim SelectorAliases[i]->replaceAllUsesWith(SelPtr); 2493221345Sdim SelectorAliases[i]->eraseFromParent(); 2494193326Sed } 2495221345Sdim 2496193326Sed // Number of classes defined. 2497198092Srdivacky Elements.push_back(llvm::ConstantInt::get(llvm::Type::getInt16Ty(VMContext), 2498193326Sed Classes.size())); 2499193326Sed // Number of categories defined 2500198092Srdivacky Elements.push_back(llvm::ConstantInt::get(llvm::Type::getInt16Ty(VMContext), 2501193326Sed Categories.size())); 2502193326Sed // Create an array of classes, then categories, then static object instances 2503193326Sed Classes.insert(Classes.end(), Categories.begin(), Categories.end()); 2504193326Sed // NULL-terminated list of static object instances (mainly constant strings) 2505193326Sed Classes.push_back(Statics); 2506193326Sed Classes.push_back(NULLPtr); 2507193326Sed llvm::Constant *ClassList = llvm::ConstantArray::get(ClassListTy, Classes); 2508193326Sed Elements.push_back(ClassList); 2509198092Srdivacky // Construct the symbol table 2510296417Sdim llvm::Constant *SymTab = 2511296417Sdim MakeGlobal(SymTabTy, Elements, CGM.getPointerAlign()); 2512193326Sed 2513193326Sed // The symbol table is contained in a module which has some version-checking 2514193326Sed // constants 2515224145Sdim llvm::StructType * ModuleTy = llvm::StructType::get(LongTy, LongTy, 2516223017Sdim PtrToInt8Ty, llvm::PointerType::getUnqual(SymTabTy), 2517276479Sdim (RuntimeVersion >= 10) ? IntTy : nullptr, nullptr); 2518193326Sed Elements.clear(); 2519221345Sdim // Runtime version, used for ABI compatibility checking. 2520221345Sdim Elements.push_back(llvm::ConstantInt::get(LongTy, RuntimeVersion)); 2521193326Sed // sizeof(ModuleTy) 2522243830Sdim llvm::DataLayout td(&TheModule); 2523221345Sdim Elements.push_back( 2524221345Sdim llvm::ConstantInt::get(LongTy, 2525221345Sdim td.getTypeSizeInBits(ModuleTy) / 2526221345Sdim CGM.getContext().getCharWidth())); 2527221345Sdim 2528221345Sdim // The path to the source file where this module was declared 2529221345Sdim SourceManager &SM = CGM.getContext().getSourceManager(); 2530221345Sdim const FileEntry *mainFile = SM.getFileEntryForID(SM.getMainFileID()); 2531221345Sdim std::string path = 2532221345Sdim std::string(mainFile->getDir()->getName()) + '/' + mainFile->getName(); 2533221345Sdim Elements.push_back(MakeConstantString(path, ".objc_source_file_name")); 2534223017Sdim Elements.push_back(SymTab); 2535221345Sdim 2536224145Sdim if (RuntimeVersion >= 10) 2537234353Sdim switch (CGM.getLangOpts().getGC()) { 2538224145Sdim case LangOptions::GCOnly: 2539223017Sdim Elements.push_back(llvm::ConstantInt::get(IntTy, 2)); 2540223017Sdim break; 2541224145Sdim case LangOptions::NonGC: 2542234353Sdim if (CGM.getLangOpts().ObjCAutoRefCount) 2543224145Sdim Elements.push_back(llvm::ConstantInt::get(IntTy, 1)); 2544224145Sdim else 2545224145Sdim Elements.push_back(llvm::ConstantInt::get(IntTy, 0)); 2546224145Sdim break; 2547224145Sdim case LangOptions::HybridGC: 2548224145Sdim Elements.push_back(llvm::ConstantInt::get(IntTy, 1)); 2549224145Sdim break; 2550224145Sdim } 2551223017Sdim 2552296417Sdim llvm::Value *Module = MakeGlobal(ModuleTy, Elements, CGM.getPointerAlign()); 2553193326Sed 2554193326Sed // Create the load function calling the runtime entry point with the module 2555193326Sed // structure 2556193326Sed llvm::Function * LoadFunction = llvm::Function::Create( 2557198092Srdivacky llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), false), 2558193326Sed llvm::GlobalValue::InternalLinkage, ".objc_load_function", 2559193326Sed &TheModule); 2560198092Srdivacky llvm::BasicBlock *EntryBB = 2561198092Srdivacky llvm::BasicBlock::Create(VMContext, "entry", LoadFunction); 2562296417Sdim CGBuilderTy Builder(CGM, VMContext); 2563193326Sed Builder.SetInsertPoint(EntryBB); 2564193326Sed 2565223017Sdim llvm::FunctionType *FT = 2566226633Sdim llvm::FunctionType::get(Builder.getVoidTy(), 2567226633Sdim llvm::PointerType::getUnqual(ModuleTy), true); 2568223017Sdim llvm::Value *Register = CGM.CreateRuntimeFunction(FT, "__objc_exec_class"); 2569193326Sed Builder.CreateCall(Register, Module); 2570234353Sdim 2571234353Sdim if (!ClassAliases.empty()) { 2572234353Sdim llvm::Type *ArgTypes[2] = {PtrTy, PtrToInt8Ty}; 2573234353Sdim llvm::FunctionType *RegisterAliasTy = 2574234353Sdim llvm::FunctionType::get(Builder.getVoidTy(), 2575234353Sdim ArgTypes, false); 2576234353Sdim llvm::Function *RegisterAlias = llvm::Function::Create( 2577234353Sdim RegisterAliasTy, 2578234353Sdim llvm::GlobalValue::ExternalWeakLinkage, "class_registerAlias_np", 2579234353Sdim &TheModule); 2580234353Sdim llvm::BasicBlock *AliasBB = 2581234353Sdim llvm::BasicBlock::Create(VMContext, "alias", LoadFunction); 2582234353Sdim llvm::BasicBlock *NoAliasBB = 2583234353Sdim llvm::BasicBlock::Create(VMContext, "no_alias", LoadFunction); 2584234353Sdim 2585234353Sdim // Branch based on whether the runtime provided class_registerAlias_np() 2586234353Sdim llvm::Value *HasRegisterAlias = Builder.CreateICmpNE(RegisterAlias, 2587234353Sdim llvm::Constant::getNullValue(RegisterAlias->getType())); 2588234353Sdim Builder.CreateCondBr(HasRegisterAlias, AliasBB, NoAliasBB); 2589234353Sdim 2590276479Sdim // The true branch (has alias registration function): 2591234353Sdim Builder.SetInsertPoint(AliasBB); 2592234353Sdim // Emit alias registration calls: 2593234353Sdim for (std::vector<ClassAliasPair>::iterator iter = ClassAliases.begin(); 2594234353Sdim iter != ClassAliases.end(); ++iter) { 2595234353Sdim llvm::Constant *TheClass = 2596234353Sdim TheModule.getGlobalVariable(("_OBJC_CLASS_" + iter->first).c_str(), 2597234353Sdim true); 2598276479Sdim if (TheClass) { 2599234353Sdim TheClass = llvm::ConstantExpr::getBitCast(TheClass, PtrTy); 2600288943Sdim Builder.CreateCall(RegisterAlias, 2601288943Sdim {TheClass, MakeConstantString(iter->second)}); 2602234353Sdim } 2603234353Sdim } 2604234353Sdim // Jump to end: 2605234353Sdim Builder.CreateBr(NoAliasBB); 2606234353Sdim 2607234353Sdim // Missing alias registration function, just return from the function: 2608234353Sdim Builder.SetInsertPoint(NoAliasBB); 2609234353Sdim } 2610193326Sed Builder.CreateRetVoid(); 2611193326Sed 2612193326Sed return LoadFunction; 2613193326Sed} 2614193326Sed 2615193326Sedllvm::Function *CGObjCGNU::GenerateMethod(const ObjCMethodDecl *OMD, 2616198092Srdivacky const ObjCContainerDecl *CD) { 2617198092Srdivacky const ObjCCategoryImplDecl *OCD = 2618193326Sed dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext()); 2619226633Sdim StringRef CategoryName = OCD ? OCD->getName() : ""; 2620226633Sdim StringRef ClassName = CD->getName(); 2621221345Sdim Selector MethodName = OMD->getSelector(); 2622193326Sed bool isClassMethod = !OMD->isInstanceMethod(); 2623193326Sed 2624193326Sed CodeGenTypes &Types = CGM.getTypes(); 2625226633Sdim llvm::FunctionType *MethodTy = 2626234353Sdim Types.GetFunctionType(Types.arrangeObjCMethodDeclaration(OMD)); 2627193326Sed std::string FunctionName = SymbolNameForMethod(ClassName, CategoryName, 2628193326Sed MethodName, isClassMethod); 2629193326Sed 2630198092Srdivacky llvm::Function *Method 2631198092Srdivacky = llvm::Function::Create(MethodTy, 2632198092Srdivacky llvm::GlobalValue::InternalLinkage, 2633198092Srdivacky FunctionName, 2634198092Srdivacky &TheModule); 2635193326Sed return Method; 2636193326Sed} 2637193326Sed 2638223017Sdimllvm::Constant *CGObjCGNU::GetPropertyGetFunction() { 2639221345Sdim return GetPropertyFn; 2640193326Sed} 2641193326Sed 2642223017Sdimllvm::Constant *CGObjCGNU::GetPropertySetFunction() { 2643221345Sdim return SetPropertyFn; 2644193326Sed} 2645193326Sed 2646234353Sdimllvm::Constant *CGObjCGNU::GetOptimizedPropertySetFunction(bool atomic, 2647234353Sdim bool copy) { 2648276479Sdim return nullptr; 2649234353Sdim} 2650234353Sdim 2651223017Sdimllvm::Constant *CGObjCGNU::GetGetStructFunction() { 2652221345Sdim return GetStructPropertyFn; 2653207619Srdivacky} 2654223017Sdimllvm::Constant *CGObjCGNU::GetSetStructFunction() { 2655221345Sdim return SetStructPropertyFn; 2656218893Sdim} 2657249423Sdimllvm::Constant *CGObjCGNU::GetCppAtomicObjectGetFunction() { 2658276479Sdim return nullptr; 2659234353Sdim} 2660249423Sdimllvm::Constant *CGObjCGNU::GetCppAtomicObjectSetFunction() { 2661276479Sdim return nullptr; 2662249423Sdim} 2663207619Srdivacky 2664198092Srdivackyllvm::Constant *CGObjCGNU::EnumerationMutationFunction() { 2665221345Sdim return EnumerationMutationFn; 2666193326Sed} 2667193326Sed 2668221345Sdimvoid CGObjCGNU::EmitSynchronizedStmt(CodeGenFunction &CGF, 2669210299Sed const ObjCAtSynchronizedStmt &S) { 2670221345Sdim EmitAtSynchronizedStmt(CGF, S, SyncEnterFn, SyncExitFn); 2671210299Sed} 2672193326Sed 2673193326Sed 2674221345Sdimvoid CGObjCGNU::EmitTryStmt(CodeGenFunction &CGF, 2675210299Sed const ObjCAtTryStmt &S) { 2676210299Sed // Unlike the Apple non-fragile runtimes, which also uses 2677210299Sed // unwind-based zero cost exceptions, the GNU Objective C runtime's 2678210299Sed // EH support isn't a veneer over C++ EH. Instead, exception 2679243830Sdim // objects are created by objc_exception_throw and destroyed by 2680210299Sed // the personality function; this avoids the need for bracketing 2681210299Sed // catch handlers with calls to __blah_begin_catch/__blah_end_catch 2682210299Sed // (or even _Unwind_DeleteException), but probably doesn't 2683210299Sed // interoperate very well with foreign exceptions. 2684221345Sdim // 2685221345Sdim // In Objective-C++ mode, we actually emit something equivalent to the C++ 2686221345Sdim // exception handler. 2687221345Sdim EmitTryCatchStmt(CGF, S, EnterCatchFn, ExitCatchFn, ExceptionReThrowFn); 2688221345Sdim return ; 2689193326Sed} 2690193326Sed 2691221345Sdimvoid CGObjCGNU::EmitThrowStmt(CodeGenFunction &CGF, 2692249423Sdim const ObjCAtThrowStmt &S, 2693249423Sdim bool ClearInsertionPoint) { 2694193326Sed llvm::Value *ExceptionAsObject; 2695193326Sed 2696193326Sed if (const Expr *ThrowExpr = S.getThrowExpr()) { 2697226633Sdim llvm::Value *Exception = CGF.EmitObjCThrowOperand(ThrowExpr); 2698193326Sed ExceptionAsObject = Exception; 2699193326Sed } else { 2700198092Srdivacky assert((!CGF.ObjCEHValueStack.empty() && CGF.ObjCEHValueStack.back()) && 2701193326Sed "Unexpected rethrow outside @catch block."); 2702193326Sed ExceptionAsObject = CGF.ObjCEHValueStack.back(); 2703193326Sed } 2704226633Sdim ExceptionAsObject = CGF.Builder.CreateBitCast(ExceptionAsObject, IdTy); 2705243830Sdim llvm::CallSite Throw = 2706249423Sdim CGF.EmitRuntimeCallOrInvoke(ExceptionThrowFn, ExceptionAsObject); 2707243830Sdim Throw.setDoesNotReturn(); 2708239462Sdim CGF.Builder.CreateUnreachable(); 2709249423Sdim if (ClearInsertionPoint) 2710249423Sdim CGF.Builder.ClearInsertionPoint(); 2711193326Sed} 2712193326Sed 2713221345Sdimllvm::Value * CGObjCGNU::EmitObjCWeakRead(CodeGenFunction &CGF, 2714296417Sdim Address AddrWeakObj) { 2715249423Sdim CGBuilderTy &B = CGF.Builder; 2716223017Sdim AddrWeakObj = EnforceType(B, AddrWeakObj, PtrToIdTy); 2717296417Sdim return B.CreateCall(WeakReadFn.getType(), WeakReadFn, 2718296417Sdim AddrWeakObj.getPointer()); 2719193326Sed} 2720193326Sed 2721221345Sdimvoid CGObjCGNU::EmitObjCWeakAssign(CodeGenFunction &CGF, 2722296417Sdim llvm::Value *src, Address dst) { 2723249423Sdim CGBuilderTy &B = CGF.Builder; 2724203955Srdivacky src = EnforceType(B, src, IdTy); 2725203955Srdivacky dst = EnforceType(B, dst, PtrToIdTy); 2726296417Sdim B.CreateCall(WeakAssignFn.getType(), WeakAssignFn, 2727296417Sdim {src, dst.getPointer()}); 2728193326Sed} 2729193326Sed 2730221345Sdimvoid CGObjCGNU::EmitObjCGlobalAssign(CodeGenFunction &CGF, 2731296417Sdim llvm::Value *src, Address dst, 2732212904Sdim bool threadlocal) { 2733249423Sdim CGBuilderTy &B = CGF.Builder; 2734203955Srdivacky src = EnforceType(B, src, IdTy); 2735203955Srdivacky dst = EnforceType(B, dst, PtrToIdTy); 2736288943Sdim // FIXME. Add threadloca assign API 2737288943Sdim assert(!threadlocal && "EmitObjCGlobalAssign - Threal Local API NYI"); 2738296417Sdim B.CreateCall(GlobalAssignFn.getType(), GlobalAssignFn, 2739296417Sdim {src, dst.getPointer()}); 2740193326Sed} 2741193326Sed 2742221345Sdimvoid CGObjCGNU::EmitObjCIvarAssign(CodeGenFunction &CGF, 2743296417Sdim llvm::Value *src, Address dst, 2744198092Srdivacky llvm::Value *ivarOffset) { 2745249423Sdim CGBuilderTy &B = CGF.Builder; 2746203955Srdivacky src = EnforceType(B, src, IdTy); 2747223017Sdim dst = EnforceType(B, dst, IdTy); 2748296417Sdim B.CreateCall(IvarAssignFn.getType(), IvarAssignFn, 2749296417Sdim {src, dst.getPointer(), ivarOffset}); 2750193326Sed} 2751193326Sed 2752221345Sdimvoid CGObjCGNU::EmitObjCStrongCastAssign(CodeGenFunction &CGF, 2753296417Sdim llvm::Value *src, Address dst) { 2754249423Sdim CGBuilderTy &B = CGF.Builder; 2755203955Srdivacky src = EnforceType(B, src, IdTy); 2756203955Srdivacky dst = EnforceType(B, dst, PtrToIdTy); 2757296417Sdim B.CreateCall(StrongCastAssignFn.getType(), StrongCastAssignFn, 2758296417Sdim {src, dst.getPointer()}); 2759193326Sed} 2760193326Sed 2761221345Sdimvoid CGObjCGNU::EmitGCMemmoveCollectable(CodeGenFunction &CGF, 2762296417Sdim Address DestPtr, 2763296417Sdim Address SrcPtr, 2764210299Sed llvm::Value *Size) { 2765249423Sdim CGBuilderTy &B = CGF.Builder; 2766223017Sdim DestPtr = EnforceType(B, DestPtr, PtrTy); 2767223017Sdim SrcPtr = EnforceType(B, SrcPtr, PtrTy); 2768203955Srdivacky 2769296417Sdim B.CreateCall(MemMoveFn.getType(), MemMoveFn, 2770296417Sdim {DestPtr.getPointer(), SrcPtr.getPointer(), Size}); 2771198092Srdivacky} 2772198092Srdivacky 2773193326Sedllvm::GlobalVariable *CGObjCGNU::ObjCIvarOffsetVariable( 2774193326Sed const ObjCInterfaceDecl *ID, 2775193326Sed const ObjCIvarDecl *Ivar) { 2776193326Sed const std::string Name = "__objc_ivar_offset_" + ID->getNameAsString() 2777193326Sed + '.' + Ivar->getNameAsString(); 2778193326Sed // Emit the variable and initialize it with what we think the correct value 2779193326Sed // is. This allows code compiled with non-fragile ivars to work correctly 2780193326Sed // when linked against code which isn't (most of the time). 2781198092Srdivacky llvm::GlobalVariable *IvarOffsetPointer = TheModule.getNamedGlobal(Name); 2782198092Srdivacky if (!IvarOffsetPointer) { 2783218893Sdim // This will cause a run-time crash if we accidentally use it. A value of 2784218893Sdim // 0 would seem more sensible, but will silently overwrite the isa pointer 2785218893Sdim // causing a great deal of confusion. 2786218893Sdim uint64_t Offset = -1; 2787218893Sdim // We can't call ComputeIvarBaseOffset() here if we have the 2788218893Sdim // implementation, because it will create an invalid ASTRecordLayout object 2789218893Sdim // that we are then stuck with forever, so we only initialize the ivar 2790218893Sdim // offset variable with a guess if we only have the interface. The 2791218893Sdim // initializer will be reset later anyway, when we are generating the class 2792218893Sdim // description. 2793218893Sdim if (!CGM.getContext().getObjCImplementation( 2794207619Srdivacky const_cast<ObjCInterfaceDecl *>(ID))) 2795207619Srdivacky Offset = ComputeIvarBaseOffset(CGM, ID, Ivar); 2796207619Srdivacky 2797226633Sdim llvm::ConstantInt *OffsetGuess = llvm::ConstantInt::get(Int32Ty, Offset, 2798226633Sdim /*isSigned*/true); 2799198092Srdivacky // Don't emit the guess in non-PIC code because the linker will not be able 2800198092Srdivacky // to replace it with the real version for a library. In non-PIC code you 2801198092Srdivacky // must compile with the fragile ABI if you want to use ivars from a 2802198092Srdivacky // GCC-compiled class. 2803234353Sdim if (CGM.getLangOpts().PICLevel || CGM.getLangOpts().PIELevel) { 2804198092Srdivacky llvm::GlobalVariable *IvarOffsetGV = new llvm::GlobalVariable(TheModule, 2805226633Sdim Int32Ty, false, 2806198092Srdivacky llvm::GlobalValue::PrivateLinkage, OffsetGuess, Name+".guess"); 2807198092Srdivacky IvarOffsetPointer = new llvm::GlobalVariable(TheModule, 2808198092Srdivacky IvarOffsetGV->getType(), false, llvm::GlobalValue::LinkOnceAnyLinkage, 2809198092Srdivacky IvarOffsetGV, Name); 2810198092Srdivacky } else { 2811198092Srdivacky IvarOffsetPointer = new llvm::GlobalVariable(TheModule, 2812198092Srdivacky llvm::Type::getInt32PtrTy(VMContext), false, 2813276479Sdim llvm::GlobalValue::ExternalLinkage, nullptr, Name); 2814198092Srdivacky } 2815193326Sed } 2816198092Srdivacky return IvarOffsetPointer; 2817193326Sed} 2818193326Sed 2819221345SdimLValue CGObjCGNU::EmitObjCValueForIvar(CodeGenFunction &CGF, 2820193326Sed QualType ObjectTy, 2821193326Sed llvm::Value *BaseValue, 2822193326Sed const ObjCIvarDecl *Ivar, 2823193326Sed unsigned CVRQualifiers) { 2824208600Srdivacky const ObjCInterfaceDecl *ID = 2825208600Srdivacky ObjectTy->getAs<ObjCObjectType>()->getInterface(); 2826193326Sed return EmitValueForIvarAtOffset(CGF, ID, BaseValue, Ivar, CVRQualifiers, 2827193326Sed EmitIvarOffset(CGF, ID, Ivar)); 2828193326Sed} 2829198092Srdivacky 2830193326Sedstatic const ObjCInterfaceDecl *FindIvarInterface(ASTContext &Context, 2831193326Sed const ObjCInterfaceDecl *OID, 2832193326Sed const ObjCIvarDecl *OIVD) { 2833226633Sdim for (const ObjCIvarDecl *next = OID->all_declared_ivar_begin(); next; 2834226633Sdim next = next->getNextIvar()) { 2835226633Sdim if (OIVD == next) 2836193326Sed return OID; 2837193326Sed } 2838198092Srdivacky 2839193326Sed // Otherwise check in the super class. 2840193326Sed if (const ObjCInterfaceDecl *Super = OID->getSuperClass()) 2841193326Sed return FindIvarInterface(Context, Super, OIVD); 2842198092Srdivacky 2843276479Sdim return nullptr; 2844193326Sed} 2845193326Sed 2846221345Sdimllvm::Value *CGObjCGNU::EmitIvarOffset(CodeGenFunction &CGF, 2847193326Sed const ObjCInterfaceDecl *Interface, 2848193326Sed const ObjCIvarDecl *Ivar) { 2849239462Sdim if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) { 2850193326Sed Interface = FindIvarInterface(CGM.getContext(), Interface, Ivar); 2851224145Sdim if (RuntimeVersion < 10) 2852224145Sdim return CGF.Builder.CreateZExtOrBitCast( 2853296417Sdim CGF.Builder.CreateDefaultAlignedLoad(CGF.Builder.CreateAlignedLoad( 2854296417Sdim ObjCIvarOffsetVariable(Interface, Ivar), 2855296417Sdim CGF.getPointerAlign(), "ivar")), 2856224145Sdim PtrDiffTy); 2857224145Sdim std::string name = "__objc_ivar_offset_value_" + 2858224145Sdim Interface->getNameAsString() +"." + Ivar->getNameAsString(); 2859296417Sdim CharUnits Align = CGM.getIntAlign(); 2860224145Sdim llvm::Value *Offset = TheModule.getGlobalVariable(name); 2861296417Sdim if (!Offset) { 2862296417Sdim auto GV = new llvm::GlobalVariable(TheModule, IntTy, 2863226633Sdim false, llvm::GlobalValue::LinkOnceAnyLinkage, 2864226633Sdim llvm::Constant::getNullValue(IntTy), name); 2865296417Sdim GV->setAlignment(Align.getQuantity()); 2866296417Sdim Offset = GV; 2867296417Sdim } 2868296417Sdim Offset = CGF.Builder.CreateAlignedLoad(Offset, Align); 2869234353Sdim if (Offset->getType() != PtrDiffTy) 2870234353Sdim Offset = CGF.Builder.CreateZExtOrBitCast(Offset, PtrDiffTy); 2871234353Sdim return Offset; 2872193326Sed } 2873193326Sed uint64_t Offset = ComputeIvarBaseOffset(CGF.CGM, Interface, Ivar); 2874226633Sdim return llvm::ConstantInt::get(PtrDiffTy, Offset, /*isSigned*/true); 2875193326Sed} 2876193326Sed 2877221345SdimCGObjCRuntime * 2878221345Sdimclang::CodeGen::CreateGNUObjCRuntime(CodeGenModule &CGM) { 2879239462Sdim switch (CGM.getLangOpts().ObjCRuntime.getKind()) { 2880239462Sdim case ObjCRuntime::GNUstep: 2881221345Sdim return new CGObjCGNUstep(CGM); 2882239462Sdim 2883239462Sdim case ObjCRuntime::GCC: 2884239462Sdim return new CGObjCGCC(CGM); 2885239462Sdim 2886239462Sdim case ObjCRuntime::ObjFW: 2887239462Sdim return new CGObjCObjFW(CGM); 2888239462Sdim 2889239462Sdim case ObjCRuntime::FragileMacOSX: 2890239462Sdim case ObjCRuntime::MacOSX: 2891239462Sdim case ObjCRuntime::iOS: 2892296417Sdim case ObjCRuntime::WatchOS: 2893239462Sdim llvm_unreachable("these runtimes are not GNU runtimes"); 2894239462Sdim } 2895239462Sdim llvm_unreachable("bad runtime"); 2896193326Sed} 2897