[WinEH] Add cleanupendpad instruction

Summary:
Add a `cleanupendpad` instruction, used to mark exceptional exits out of
cleanups (for languages/targets that can abort a cleanup with another
exception).  The `cleanupendpad` instruction is similar to the `catchendpad`
instruction in that it is an EH pad which is the target of unwind edges in
the handler and which itself has an unwind edge to the next EH action.
The `cleanupendpad` instruction, similar to `cleanupret` has a `cleanuppad`
argument indicating which cleanup it exits.  The unwind successors of a
`cleanuppad`'s `cleanupendpad`s must agree with each other and with its
`cleanupret`s.

Update WinEHPrepare (and docs/tests) to accomodate `cleanupendpad`.

Reviewers: rnk, andrew.w.kaylor, majnemer

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D12433

llvm-svn: 246751

1 files changed, 6 insertions, 4 deletions

diff --git a/llvm/include/llvm-c/Core.h b/llvm/include/llvm-c/Core.h
index 3bb8828fe84..14675854266 100644
--- a/llvm/include/llvm-c/Core.h
+++ b/llvm/include/llvm-c/Core.h
@@ -251,10 +251,11 @@ typedef enum {
   LLVMLandingPad     = 59,
   LLVMCleanupRet     = 61,
   LLVMCatchRet       = 62,
-  LLVMCatchPad     = 63,
-  LLVMTerminatePad = 64,
-  LLVMCleanupPad   = 65,
-  LLVMCatchEndPad  = 66
+  LLVMCatchPad       = 63,
+  LLVMTerminatePad   = 64,
+  LLVMCleanupPad     = 65,
+  LLVMCatchEndPad    = 66,
+  LLVMCleanupEndPad  = 67
 
 } LLVMOpcode;
 
@@ -1228,6 +1229,7 @@ LLVMTypeRef LLVMX86MMXType(void);
         macro(CatchPadInst)               \
         macro(TerminatePadInst)           \
         macro(CatchEndPadInst)            \
+        macro(CleanupEndPadInst)            \
       macro(UnaryInstruction)               \
         macro(AllocaInst)                   \
         macro(CastInst)                     \