Code gen. for @protocol expression in the new nonfragile abi.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@63408 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGObjCMac.cpp b/lib/CodeGen/CGObjCMac.cpp
index 526a95a..cf7010a 100644
--- a/lib/CodeGen/CGObjCMac.cpp
+++ b/lib/CodeGen/CGObjCMac.cpp
@@ -638,10 +638,8 @@
virtual void GenerateCategory(const ObjCCategoryImplDecl *CMD);
virtual void GenerateClass(const ObjCImplementationDecl *ClassDecl);
-
virtual llvm::Value *GenerateProtocolRef(CGBuilderTy &Builder,
- const ObjCProtocolDecl *PD)
- { return 0; }
+ const ObjCProtocolDecl *PD);
virtual llvm::Function *GetPropertyGetFunction(){ return 0; }
virtual llvm::Function *GetPropertySetFunction()
@@ -3461,6 +3459,38 @@
BuildClassMetaData(TClassName, MetaTClass, SuperClassGV, CLASS_RO_GV);
}
+/// GenerateProtocolRef - This routine is called to generate code for
+/// a protocol reference expression; as in:
+/// @code
+/// @protocol(Proto1);
+/// @endcode
+/// It generates a weak reference to l_OBJC_PROTOCOL_REFERENCE_$_Proto1
+/// which will hold address of the protocol meta-data.
+///
+llvm::Value *CGObjCNonFragileABIMac::GenerateProtocolRef(CGBuilderTy &Builder,
+ const ObjCProtocolDecl *PD) {
+
+ llvm::Constant *Init = llvm::ConstantExpr::getBitCast(GetProtocolRef(PD),
+ ObjCTypes.ExternalProtocolPtrTy);
+
+ std::string ProtocolName("\01l_OBJC_PROTOCOL_REFERENCE_$_");
+ ProtocolName += PD->getNameAsCString();
+
+ llvm::GlobalVariable *PTGV = CGM.getModule().getGlobalVariable(ProtocolName);
+ if (PTGV)
+ return Builder.CreateLoad(PTGV, false, "tmp");
+ PTGV = new llvm::GlobalVariable(
+ Init->getType(), false,
+ llvm::GlobalValue::WeakLinkage,
+ Init,
+ ProtocolName,
+ &CGM.getModule());
+ PTGV->setSection("__DATA, __objc_protorefs, coalesced, no_dead_strip");
+ PTGV->setVisibility(llvm::GlobalValue::HiddenVisibility);
+ UsedGlobals.push_back(PTGV);
+ return Builder.CreateLoad(PTGV, false, "tmp");
+}
+
/// GenerateCategory - Build metadata for a category implementation.
/// struct _category_t {
/// const char * const name;
@@ -3936,7 +3966,7 @@
Desc[0] = llvm::ConstantExpr::getBitCast(GetMethodVarName(MD->getSelector()),
ObjCTypes.SelectorPtrTy);
Desc[1] = GetMethodVarType(MD);
- // FIXME. This is really always NULL?
+ // Protocol methods have no implementation. So, this entry is always NULL.
Desc[2] = llvm::Constant::getNullValue(ObjCTypes.Int8PtrTy);
return llvm::ConstantStruct::get(ObjCTypes.MethodTy, Desc);
}