[WinEH] Add a funclet layout pass

Windows EH funclets need to be contiguous.  The FuncletLayout pass will
ensure that the funclets are together and begin with a funclet entry MBB.

Differential Revision: http://reviews.llvm.org/D12943

llvm-svn: 247937

1 files changed, 45 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/funclet-layout.ll b/llvm/test/CodeGen/X86/funclet-layout.ll
new file mode 100644
index 00000000000..9e6fbb6fbb5
--- /dev/null
+++ b/llvm/test/CodeGen/X86/funclet-layout.ll
@@ -0,0 +1,45 @@
+; RUN: llc -mtriple=x86_64-windows-msvc < %s | FileCheck %s
+
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc"
+
+define void @f(i1 %B) personality i32 (...)* @__CxxFrameHandler3 {
+entry:
+  invoke void @g()
+          to label %unreachable unwind label %catch.dispatch
+
+catch.dispatch:
+  %cp = catchpad [i8* null, i32 64, i8* null]
+          to label %catch unwind label %catchendblock
+
+catch:
+  br i1 %B, label %catchret, label %catch
+
+catchret:
+  catchret %cp to label %try.cont
+
+try.cont:
+  ret void
+
+catchendblock:
+  catchendpad unwind to caller
+
+unreachable:
+  unreachable
+}
+
+; CHECK-LABEL: f:
+
+; The entry funclet contains %entry and %try.cont
+; CHECK: # %entry
+; CHECK: # %try.cont
+; CHECK: retq
+
+; The catch funclet contains %catch and %catchret
+; CHECK: # %catch
+; CHECK: # %catchret
+; CHECK: retq
+
+declare void @g()
+
+declare i32 @__CxxFrameHandler3(...)