llvm/test/Transforms/SimplifyCFG/empty-catchpad.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s

declare void @f()
declare void @llvm.foo(i32) nounwind
declare void @ProcessCLRException()

define void @test1() personality void ()* @ProcessCLRException {
; CHECK-LABEL: @test1(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    invoke void @f()
; CHECK-NEXT:    to label [[EXIT:%.*]] unwind label [[EXN_DISPATCH:%.*]]
; CHECK:       exn.dispatch:
; CHECK-NEXT:    [[CS:%.*]] = catchswitch within none [label %pad1] unwind to caller
; CHECK:       pad1:
; CHECK-NEXT:    [[CP1:%.*]] = catchpad within [[CS]] [i32 1]
; CHECK-NEXT:    call void @llvm.foo(i32 1)
; CHECK-NEXT:    catchret from [[CP1]] to label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  invoke void @f()
  to label %exit unwind label %exn.dispatch
exn.dispatch:
  %cs = catchswitch within none [label %pad1, label %pad2] unwind to caller
pad1:
  %cp1 = catchpad within %cs [i32 1]
  call void @llvm.foo(i32 1)
  catchret from %cp1 to label %exit
pad2:
  %cp2 = catchpad within %cs [i32 2]
  unreachable
exit:
  ret void
}
; Remove unreachble catch2, leave catch1 as-is

; Remove both catchpads and the catchswitch from exn.dispatch
define void @test2() personality void ()* @ProcessCLRException {
; CHECK-LABEL: @test2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    call void @f()
; CHECK-NEXT:    invoke void @f()
; CHECK-NEXT:    to label [[VIA_CATCHSWITCH:%.*]] unwind label [[CLEANUP_INNER:%.*]]
; CHECK:       cleanup.inner:
; CHECK-NEXT:    [[CP_INNER:%.*]] = cleanuppad within none []
; CHECK-NEXT:    call void @llvm.foo(i32 0)
; CHECK-NEXT:    cleanupret from [[CP_INNER]] unwind to caller
; CHECK:       via.catchswitch:
; CHECK-NEXT:    invoke void @f()
; CHECK-NEXT:    to label [[EXIT:%.*]] unwind label [[DISPATCH_INNER:%.*]]
; CHECK:       dispatch.inner:
; CHECK-NEXT:    [[CS_INNER:%.*]] = catchswitch within none [label %pad.inner] unwind to caller
; CHECK:       pad.inner:
; CHECK-NEXT:    [[CATCH_INNER:%.*]] = catchpad within [[CS_INNER]] [i32 0]
; CHECK-NEXT:    call void @llvm.foo(i32 1)
; CHECK-NEXT:    catchret from [[CATCH_INNER]] to label [[EXIT]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  invoke void @f()
  to label %via.cleanup unwind label %exn.dispatch
via.cleanup:
  invoke void @f()
  to label %via.catchswitch unwind label %cleanup.inner
cleanup.inner:
  %cp.inner = cleanuppad within none []
  call void @llvm.foo(i32 0)
  cleanupret from %cp.inner unwind label %exn.dispatch
via.catchswitch:
  invoke void @f()
  to label %exit unwind label %dispatch.inner
dispatch.inner:
  %cs.inner = catchswitch within none [label %pad.inner] unwind label %exn.dispatch
pad.inner:
  %catch.inner = catchpad within %cs.inner [i32 0]
  call void @llvm.foo(i32 1)
  catchret from %catch.inner to label %exit
exn.dispatch:
  %cs = catchswitch within none [label %pad1, label %pad2] unwind to caller
pad1:
  catchpad within %cs [i32 1]
  unreachable
pad2:
  catchpad within %cs [i32 2]
  unreachable
exit:
  ret void
}

; Same as @test2, but exn.dispatch catchswitch has an unwind dest that
; preds need to be reidrected to
define void @test3() personality void ()* @ProcessCLRException {
; CHECK-LABEL: @test3(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    invoke void @f()
; CHECK-NEXT:    to label [[VIA_CLEANUP:%.*]] unwind label [[CLEANUP:%.*]]
; CHECK:       via.cleanup:
; CHECK-NEXT:    invoke void @f()
; CHECK-NEXT:    to label [[VIA_CATCHSWITCH:%.*]] unwind label [[CLEANUP_INNER:%.*]]
; CHECK:       cleanup.inner:
; CHECK-NEXT:    [[CP_INNER:%.*]] = cleanuppad within none []
; CHECK-NEXT:    call void @llvm.foo(i32 0)
; CHECK-NEXT:    cleanupret from [[CP_INNER]] unwind label [[CLEANUP]]
; CHECK:       via.catchswitch:
; CHECK-NEXT:    invoke void @f()
; CHECK-NEXT:    to label [[EXIT:%.*]] unwind label [[DISPATCH_INNER:%.*]]
; CHECK:       dispatch.inner:
; CHECK-NEXT:    [[CS_INNER:%.*]] = catchswitch within none [label %pad.inner] unwind label [[CLEANUP]]
; CHECK:       pad.inner:
; CHECK-NEXT:    [[CATCH_INNER:%.*]] = catchpad within [[CS_INNER]] [i32 0]
; CHECK-NEXT:    call void @llvm.foo(i32 1)
; CHECK-NEXT:    catchret from [[CATCH_INNER]] to label [[EXIT]]
; CHECK:       cleanup:
; CHECK-NEXT:    [[CP:%.*]] = cleanuppad within none []
; CHECK-NEXT:    call void @llvm.foo(i32 0)
; CHECK-NEXT:    cleanupret from [[CP]] unwind to caller
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  invoke void @f()
  to label %via.cleanup unwind label %exn.dispatch
via.cleanup:
  invoke void @f()
  to label %via.catchswitch unwind label %cleanup.inner
cleanup.inner:
  %cp.inner = cleanuppad within none []
  call void @llvm.foo(i32 0)
  cleanupret from %cp.inner unwind label %exn.dispatch
via.catchswitch:
  invoke void @f()
  to label %exit unwind label %dispatch.inner
dispatch.inner:
  %cs.inner = catchswitch within none [label %pad.inner] unwind label %exn.dispatch
pad.inner:
  %catch.inner = catchpad within %cs.inner [i32 0]
  call void @llvm.foo(i32 1)
  catchret from %catch.inner to label %exit
exn.dispatch:
  %cs = catchswitch within none [label %pad1, label %pad2] unwind label %cleanup
pad1:
  catchpad within %cs [i32 1]
  unreachable
pad2:
  catchpad within %cs [i32 2]
  unreachable
cleanup:
  %cp = cleanuppad within none []
  call void @llvm.foo(i32 0)
  cleanupret from %cp unwind to caller
exit:
  ret void
}