[MS-ABI] Assign SEH handler indices to __try blocks

Assigns indices to try blocks. These indices will used in constructing 
tables that the mscrt function __except_handler3 reads during SEH.
Testing will occur once we actually emit the tables, in a subsequent 
patch.

llvm-svn: 213437

1 files changed, 8 insertions, 1 deletions

diff --git a/clang/lib/Sema/Scope.cpp b/clang/lib/Sema/Scope.cpp
index 6c797788238..35e2075b382 100644
--- a/clang/lib/Sema/Scope.cpp
+++ b/clang/lib/Sema/Scope.cpp
@@ -39,6 +39,9 @@ void Scope::Init(Scope *parent, unsigned flags) {
     BlockParent    = parent->BlockParent;
     TemplateParamParent = parent->TemplateParamParent;
     MSLocalManglingParent = parent->MSLocalManglingParent;
+    SEHTryParent = parent->SEHTryParent;
+    if (parent->Flags & SEHTryScope)
+      SEHTryParent = parent;
     if ((Flags & (FnScope | ClassScope | BlockScope | TemplateParamScope |
                   FunctionPrototypeScope | AtCatchScope | ObjCMethodScope)) ==
         0)
@@ -47,13 +50,17 @@ void Scope::Init(Scope *parent, unsigned flags) {
     Depth = 0;
     PrototypeDepth = 0;
     PrototypeIndex = 0;
-    MSLocalManglingParent = FnParent = BlockParent = nullptr;
+    SEHTryParent = MSLocalManglingParent = FnParent = BlockParent = nullptr;
     TemplateParamParent = nullptr;
     MSLocalManglingNumber = 1;
   }
 
   // If this scope is a function or contains breaks/continues, remember it.
   if (flags & FnScope)            FnParent = this;
+  SEHTryIndexPool = 0;
+  SEHTryIndex = -1;
+  if (flags & SEHTryScope)
+    SEHTryIndex = FnParent ? FnParent->SEHTryIndexPool++ : -1;
   // The MS mangler uses the number of scopes that can hold declarations as
   // part of an external name.
   if (Flags & (ClassScope | FnScope)) {