[PATCH] D50144: Add Windows support for the GNUstep Objective-C ABI V2.

[Dustin L. Howett via Phabricator via cfe-commits]

DHowett-MSFT accepted this revision.
DHowett-MSFT added a comment.
This revision is now accepted and ready to land.

This looks good to me, but I don't have a strong understanding of "outlining."



================
Comment at: lib/CodeGen/CGBlocks.cpp:1262
+  if (IsWindows) {
+    auto *Init = llvm::Function::Create(llvm::FunctionType::get(CGM.VoidTy,
+          {}), llvm::GlobalValue::InternalLinkage, ".block_isa_init",
----------------
Is there value in emitting a list of blocks that need to be initialized, then initializing them in one go in a COMDAT-foldable function?


================
Comment at: lib/CodeGen/CGObjCGNU.cpp:1522
+          GetClassVar(clsAlias.first) }, sectionName<ClassAliasSection>());
+    // On ELF platforms, add a null value fore each special section so that we
+    // can always guarantee that the _start and _stop symbols will exist and be
----------------
nit: `fore`


================
Comment at: lib/CodeGen/CGObjCRuntime.cpp:234
+        if ((CPI = dyn_cast_or_null<llvm::CatchPadInst>(Handler.Block->getFirstNonPHI()))) {
+        CGF.CurrentFuncletPad = CPI;
+        CPI->setOperand(2, CGF.getExceptionSlot().getPointer());
----------------
this region may need reformatting


================
Comment at: lib/CodeGen/CGObjCRuntime.cpp:274
     CGF.EmitBranchThroughCleanup(Cont);
-  }
+    CGF.CurrentFuncletPad = nullptr;
+  }  
----------------
There's a scoped save/restore helper for this that'll offer better support for nested funclets.

```
SaveAndRestore<llvm::Instruction *> RestoreCurrentFuncletPad(CGF.CurrentFuncletPad);
```


Repository:
  rC Clang

https://reviews.llvm.org/D50144