2007-08-21 17:43:55 +00:00
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//===---- CGBuiltin.cpp - Emit LLVM Code for builtins ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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2007-12-29 19:59:25 +00:00
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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2007-08-21 17:43:55 +00:00
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//
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//===----------------------------------------------------------------------===//
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//
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// This contains code to emit Objective-C code as LLVM code.
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//
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//===----------------------------------------------------------------------===//
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2008-04-09 15:51:31 +00:00
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#include "CGObjCRuntime.h"
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2007-08-21 17:43:55 +00:00
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#include "CodeGenFunction.h"
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#include "CodeGenModule.h"
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2008-08-11 05:35:13 +00:00
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#include "clang/AST/DeclObjC.h"
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2008-06-17 18:05:57 +00:00
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2007-08-21 17:43:55 +00:00
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using namespace clang;
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using namespace CodeGen;
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2008-06-24 17:04:18 +00:00
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/// Emits an instance of NSConstantString representing the object.
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2008-08-12 00:12:39 +00:00
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llvm::Value *CodeGenFunction::EmitObjCStringLiteral(const ObjCStringLiteral *E) {
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std::string String(E->getString()->getStrData(), E->getString()->getByteLength());
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llvm::Constant *C = CGM.getObjCRuntime().GenerateConstantString(String);
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2008-08-20 00:28:19 +00:00
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// FIXME: This bitcast should just be made an invariant on the Runtime.
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2008-08-12 00:12:39 +00:00
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return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType()));
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2008-06-24 17:04:18 +00:00
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}
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/// Emit a selector.
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llvm::Value *CodeGenFunction::EmitObjCSelectorExpr(const ObjCSelectorExpr *E) {
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// Untyped selector.
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// Note that this implementation allows for non-constant strings to be passed
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// as arguments to @selector(). Currently, the only thing preventing this
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// behaviour is the type checking in the front end.
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2008-08-11 18:12:00 +00:00
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return CGM.getObjCRuntime().GetSelector(Builder, E->getSelector());
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2008-06-24 17:04:18 +00:00
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}
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2008-08-20 00:28:19 +00:00
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llvm::Value *CodeGenFunction::EmitObjCProtocolExpr(const ObjCProtocolExpr *E) {
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// FIXME: This should pass the Decl not the name.
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return CGM.getObjCRuntime().GenerateProtocolRef(Builder, E->getProtocol());
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}
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2008-06-24 17:04:18 +00:00
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2008-08-23 03:46:30 +00:00
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RValue CodeGenFunction::EmitObjCMessageExpr(const ObjCMessageExpr *E) {
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2008-06-24 17:04:18 +00:00
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// Only the lookup mechanism and first two arguments of the method
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// implementation vary between runtimes. We can get the receiver and
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// arguments in generic code.
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2008-08-11 18:12:00 +00:00
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CGObjCRuntime &Runtime = CGM.getObjCRuntime();
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2008-06-24 17:04:18 +00:00
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const Expr *ReceiverExpr = E->getReceiver();
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bool isSuperMessage = false;
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2008-08-25 08:19:24 +00:00
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bool isClassMessage = false;
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2008-06-24 17:04:18 +00:00
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// Find the receiver
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llvm::Value *Receiver;
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if (!ReceiverExpr) {
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2008-08-16 00:25:02 +00:00
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const ObjCInterfaceDecl *OID = E->getClassInfo().first;
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// Very special case, super send in class method. The receiver is
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// self (the class object) and the send uses super semantics.
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if (!OID) {
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assert(!strcmp(E->getClassName()->getName(), "super") &&
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"Unexpected missing class interface in message send.");
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isSuperMessage = true;
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2008-08-25 08:19:24 +00:00
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Receiver = LoadObjCSelf();
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} else {
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Receiver = Runtime.GetClass(Builder, OID);
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2008-06-24 17:04:18 +00:00
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}
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2008-08-25 08:19:24 +00:00
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isClassMessage = true;
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2008-08-10 01:53:14 +00:00
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} else if (const PredefinedExpr *PDE =
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dyn_cast<PredefinedExpr>(E->getReceiver())) {
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assert(PDE->getIdentType() == PredefinedExpr::ObjCSuper);
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2008-06-24 17:04:18 +00:00
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isSuperMessage = true;
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Receiver = LoadObjCSelf();
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} else {
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2008-08-12 05:28:47 +00:00
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Receiver = EmitScalarExpr(E->getReceiver());
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2008-06-24 17:04:18 +00:00
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}
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if (isSuperMessage) {
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2008-06-26 04:42:20 +00:00
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// super is only valid in an Objective-C method
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const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl);
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2008-08-23 03:46:30 +00:00
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return Runtime.GenerateMessageSendSuper(*this, E,
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2008-08-25 08:19:24 +00:00
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OMD->getClassInterface(),
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Receiver,
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isClassMessage);
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2008-06-24 17:04:18 +00:00
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}
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2008-08-25 08:19:24 +00:00
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return Runtime.GenerateMessageSend(*this, E, Receiver, isClassMessage);
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2007-08-21 17:43:55 +00:00
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}
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2008-08-26 08:29:31 +00:00
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/// StartObjCMethod - Begin emission of an ObjCMethod. This generates
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/// the LLVM function and sets the other context used by
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/// CodeGenFunction.
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// FIXME: This should really be merged with GenerateCode.
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void CodeGenFunction::StartObjCMethod(const ObjCMethodDecl *OMD) {
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2008-08-15 22:20:32 +00:00
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CurFn = CGM.getObjCRuntime().GenerateMethod(OMD);
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2008-06-17 18:05:57 +00:00
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llvm::BasicBlock *EntryBB = llvm::BasicBlock::Create("entry", CurFn);
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// Create a marker to make it easy to insert allocas into the entryblock
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// later. Don't create this with the builder, because we don't want it
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// folded.
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llvm::Value *Undef = llvm::UndefValue::get(llvm::Type::Int32Ty);
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AllocaInsertPt = new llvm::BitCastInst(Undef, llvm::Type::Int32Ty, "allocapt",
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EntryBB);
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FnRetTy = OMD->getResultType();
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CurFuncDecl = OMD;
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Builder.SetInsertPoint(EntryBB);
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// Emit allocs for param decls. Give the LLVM Argument nodes names.
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llvm::Function::arg_iterator AI = CurFn->arg_begin();
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2008-08-16 03:19:19 +00:00
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// Name the struct return argument.
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2008-06-17 18:05:57 +00:00
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if (hasAggregateLLVMType(OMD->getResultType())) {
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2008-08-16 03:19:19 +00:00
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AI->setName("agg.result");
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2008-06-17 18:05:57 +00:00
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++AI;
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}
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2008-08-16 03:19:19 +00:00
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2008-06-17 18:05:57 +00:00
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// Add implicit parameters to the decl map.
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2008-08-16 03:19:19 +00:00
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EmitParmDecl(*OMD->getSelfDecl(), AI);
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++AI;
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EmitParmDecl(*OMD->getCmdDecl(), AI);
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2008-06-17 18:05:57 +00:00
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++AI;
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for (unsigned i = 0, e = OMD->getNumParams(); i != e; ++i, ++AI) {
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assert(AI != CurFn->arg_end() && "Argument mismatch!");
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EmitParmDecl(*OMD->getParamDecl(i), AI);
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}
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2008-08-16 03:19:19 +00:00
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assert(AI == CurFn->arg_end() && "Argument mismatch");
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2008-08-26 08:29:31 +00:00
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}
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/// Generate an Objective-C method. An Objective-C method is a C function with
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/// its pointer, name, and types registered in the class struture.
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void CodeGenFunction::GenerateObjCMethod(const ObjCMethodDecl *OMD) {
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StartObjCMethod(OMD);
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EmitStmt(OMD->getBody());
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const CompoundStmt *S = dyn_cast<CompoundStmt>(OMD->getBody());
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if (S) {
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FinishFunction(S->getRBracLoc());
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} else {
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FinishFunction();
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}
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}
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// FIXME: I wasn't sure about the synthesis approach. If we end up
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// generating an AST for the whole body we can just fall back to
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// having a GenerateFunction which takes the body Stmt.
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/// GenerateObjCGetter - Generate an Objective-C property getter
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/// function. The given Decl must be either an ObjCCategoryImplDecl
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/// or an ObjCImplementationDecl.
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void CodeGenFunction::GenerateObjCGetter(const ObjCPropertyImplDecl *PID) {
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const ObjCPropertyDecl *PD = PID->getPropertyDecl();
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ObjCMethodDecl *OMD = PD->getGetterMethodDecl();
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assert(OMD && "Invalid call to generate getter (empty method)");
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// FIXME: This is rather murky, we create this here since they will
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// not have been created by Sema for us.
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OMD->createImplicitParams(getContext());
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StartObjCMethod(OMD);
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// FIXME: What about nonatomic?
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SourceLocation Loc = PD->getLocation();
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ValueDecl *Self = OMD->getSelfDecl();
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ObjCIvarDecl *Ivar = PID->getPropertyIvarDecl();
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DeclRefExpr Base(Self, Self->getType(), Loc);
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ObjCIvarRefExpr IvarRef(Ivar, Ivar->getType(), Loc, &Base,
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true, true);
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ReturnStmt Return(Loc, &IvarRef);
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EmitStmt(&Return);
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FinishFunction();
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}
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/// GenerateObjCSetter - Generate an Objective-C property setter
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/// function. The given Decl must be either an ObjCCategoryImplDecl
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/// or an ObjCImplementationDecl.
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void CodeGenFunction::GenerateObjCSetter(const ObjCPropertyImplDecl *PID) {
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const ObjCPropertyDecl *PD = PID->getPropertyDecl();
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ObjCMethodDecl *OMD = PD->getSetterMethodDecl();
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assert(OMD && "Invalid call to generate setter (empty method)");
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// FIXME: This is rather murky, we create this here since they will
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// not have been created by Sema for us.
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OMD->createImplicitParams(getContext());
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StartObjCMethod(OMD);
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switch (PD->getSetterKind()) {
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case ObjCPropertyDecl::Assign: break;
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case ObjCPropertyDecl::Copy:
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CGM.ErrorUnsupported(PID, "Obj-C setter with 'copy'");
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break;
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case ObjCPropertyDecl::Retain:
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CGM.ErrorUnsupported(PID, "Obj-C setter with 'retain'");
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break;
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}
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2008-08-16 03:19:19 +00:00
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2008-08-26 08:29:31 +00:00
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// FIXME: What about nonatomic?
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SourceLocation Loc = PD->getLocation();
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ValueDecl *Self = OMD->getSelfDecl();
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ObjCIvarDecl *Ivar = PID->getPropertyIvarDecl();
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DeclRefExpr Base(Self, Self->getType(), Loc);
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ParmVarDecl *ArgDecl = OMD->getParamDecl(0);
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DeclRefExpr Arg(ArgDecl, ArgDecl->getType(), Loc);
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ObjCIvarRefExpr IvarRef(Ivar, Ivar->getType(), Loc, &Base,
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true, true);
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BinaryOperator Assign(&IvarRef, &Arg, BinaryOperator::Assign,
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Ivar->getType(), Loc);
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EmitStmt(&Assign);
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FinishFunction();
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2008-06-17 18:05:57 +00:00
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}
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2008-08-16 03:19:19 +00:00
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llvm::Value *CodeGenFunction::LoadObjCSelf(void) {
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const ObjCMethodDecl *OMD = cast<ObjCMethodDecl>(CurFuncDecl);
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return Builder.CreateLoad(LocalDeclMap[OMD->getSelfDecl()], "self");
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2008-06-17 18:05:57 +00:00
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}
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2008-04-09 15:51:31 +00:00
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CGObjCRuntime::~CGObjCRuntime() {}
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