test/CodeGen/WebAssembly/cfg-stackify-eh.mir

# RUN: llc -mtriple=wasm32-unknown-unknown -exception-model=wasm -run-pass wasm-cfg-stackify %s -o - | FileCheck %s

--- |
  target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
  target triple = "wasm32-unknown-unknown"

  @__wasm_lpad_context = external global { i32, i8*, i32 }

  declare void @may_throw()
  ; Function Attrs: nounwind
  declare void @dont_throw() #0
  declare i8* @__cxa_begin_catch(i8*)
  declare void @__cxa_end_catch()
  declare void @__cxa_rethrow()
  ; Function Attrs: nounwind
  declare i32 @__gxx_wasm_personality_v0(...)
  declare i32 @_Unwind_CallPersonality(i8*) #0

  define void @test0() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
    unreachable
  }
  define void @test1() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
    unreachable
  }
  define void @test2() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
    unreachable
  }
  define void @test3() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
    unreachable
  }

  attributes #0 = { nounwind }

---
# Simplest try-catch
# try {
#   may_throw();
# } catch (...) {
# }
name: test0
# CHECK-LABEL: name: test0
liveins:
  - { reg: '$arguments', reg: '$value_stack' }
body: |
  bb.0:
    successors: %bb.2, %bb.1

    CALL_VOID @may_throw, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    BR %bb.2, implicit-def $arguments
  ; CHECK-LABEL: bb.0:
    ; CHECK: TRY
    ; CHECK-NEXT: CALL_VOID @may_throw

  bb.1 (landing-pad):
  ; predecessors: %bb.0
    successors: %bb.2

    %2:i32 = CATCH_I32 0, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %3:i32 = CALL_I32 @__cxa_begin_catch, %2:i32, implicit-def dead $arguments, implicit $sp32, implicit $sp64, implicit-def $value_stack, implicit $value_stack
    DROP_I32 killed %3:i32, implicit-def $arguments
    CALL_VOID @__cxa_end_catch, implicit-def dead $arguments, implicit $sp32, implicit $sp64

  bb.2:
  ; predecessors: %bb.0, %bb.1

    RETURN_VOID implicit-def dead $arguments
  ; CHECK-LABEL: bb.2:
    ; CHECK-NEXT: END_TRY
    ; CHECK: RETURN_VOID
...
---

# Nested try-catch inside another catch
#  try {
#    may_throw();
#  } catch (int n) {
#    try {
#      may_throw();
#    } catch (int n) {
#    }
#  }
name: test1
# CHECK-LABEL: name: test1
liveins:
  - { reg: '$arguments', reg: '$value_stack' }
body: |
  bb.0:
    successors: %bb.9, %bb.1

    CALL_VOID @may_throw, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    BR %bb.9, implicit-def $arguments
  ; CHECK-LABEL: bb.0:
    ; CHECK: TRY
    ; CHECK-NEXT: CALL_VOID @may_throw

  bb.1 (landing-pad):
  ; predecessors: %bb.0
    successors: %bb.2, %bb.7

    %30:i32 = CATCH_I32 0, implicit-def dead $arguments
    LOCAL_SET_I32 0, %30:i32, implicit-def $arguments
    %16:i32 = CONST_I32 0, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %27:i32 = CONST_I32 0, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    STORE_I32 2, @__wasm_lpad_context + 4, %16:i32, %27:i32, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack :: (store 4 into `i8** getelementptr inbounds ({ i32, i8*, i32 }, { i32, i8*, i32 }* @__wasm_lpad_context, i32 0, i32 1)`)
    %26:i32 = CONST_I32 0, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %25:i32 = CONST_I32 0, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    STORE_I32 2, @__wasm_lpad_context, %26:i32, %25:i32, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack :: (store 4 into `i32* getelementptr inbounds ({ i32, i8*, i32 }, { i32, i8*, i32 }* @__wasm_lpad_context, i32 0, i32 0)`)
    %32:i32 = LOCAL_GET_I32 0, implicit-def $arguments
    %31:i32 = CALL_I32 @_Unwind_CallPersonality, %32:i32, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    DROP_I32 killed %31:i32, implicit-def $arguments
    %24:i32 = CONST_I32 0, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %17:i32 = LOAD_I32 2, @__wasm_lpad_context + 8, %24:i32, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack :: (dereferenceable load 4 from `i32* getelementptr inbounds ({ i32, i8*, i32 }, { i32, i8*, i32 }* @__wasm_lpad_context, i32 0, i32 2)`)
    %18:i32 = CONST_I32 1, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %19:i32 = NE_I32 %17:i32, %18:i32, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    BR_IF %bb.7, %19:i32, implicit-def $arguments, implicit-def $value_stack, implicit $value_stack

  bb.2:
  ; predecessors: %bb.1
    successors: %bb.8, %bb.3, %bb.6

    %34:i32 = LOCAL_GET_I32 0, implicit-def $arguments
    %33:i32 = CALL_I32 @__cxa_begin_catch, %34:i32, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    DROP_I32 killed %33:i32, implicit-def $arguments
    CALL_VOID @may_throw, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    BR %bb.8, implicit-def $arguments
  ; CHECK-LABEL: bb.2:
    ; CHECK: DROP_I32
    ; CHECK-NEXT: TRY
    ; CHECK-NEXT: TRY
    ; CHECK-NEXT: CALL_VOID @may_throw

  bb.3 (landing-pad):
  ; predecessors: %bb.2
    successors: %bb.4, %bb.5

    %35:i32 = CATCH_I32 0, implicit-def dead $arguments
    LOCAL_SET_I32 0, %35:i32, implicit-def $arguments
    %21:i32 = CONST_I32 0, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %20:i32 = CONST_I32 1, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    STORE_I32 2, @__wasm_lpad_context, %21:i32, %20:i32, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack :: (store 4 into `i32* getelementptr inbounds ({ i32, i8*, i32 }, { i32, i8*, i32 }* @__wasm_lpad_context, i32 0, i32 0)`)
    %37:i32 = LOCAL_GET_I32 0, implicit-def $arguments
    %36:i32 = CALL_I32 @_Unwind_CallPersonality, %37:i32, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    DROP_I32 killed %36:i32, implicit-def $arguments
    %29:i32 = CONST_I32 0, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %22:i32 = LOAD_I32 2, @__wasm_lpad_context + 8, %29:i32, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack :: (dereferenceable load 4 from `i32* getelementptr inbounds ({ i32, i8*, i32 }, { i32, i8*, i32 }* @__wasm_lpad_context, i32 0, i32 2)`)
    %28:i32 = CONST_I32 1, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %23:i32 = NE_I32 %22:i32, %28:i32, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    BR_IF %bb.5, %23:i32, implicit-def $arguments, implicit-def $value_stack, implicit $value_stack

  bb.4:
  ; predecessors: %bb.3
    successors: %bb.8

    %39:i32 = LOCAL_GET_I32 0, implicit-def $arguments
    %38:i32 = CALL_I32 @__cxa_begin_catch, %39:i32, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    DROP_I32 killed %38:i32, implicit-def $arguments
    CALL_VOID @__cxa_end_catch, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    BR %bb.8, implicit-def $arguments

  bb.5:
  ; predecessors: %bb.3
    successors: %bb.6

    CALL_VOID @__cxa_rethrow, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    RETHROW %bb.6, implicit-def $arguments

  bb.6 (landing-pad):
  ; predecessors: %bb.2, %bb.5

    CATCH_ALL implicit-def $arguments
    CALL_VOID @__cxa_end_catch, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    RETHROW_TO_CALLER implicit-def $arguments
  ; CHECK-LABEL: bb.6 (landing-pad):
    ; CHECK-NEXT: END_TRY

  bb.7:
  ; predecessors: %bb.1

    CALL_VOID @__cxa_rethrow, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    RETHROW_TO_CALLER implicit-def $arguments
  ; CHECK-LABEL: bb.7:
    ; CHECK-NEXT: END_TRY
    ; CHECK: RETHROW 0

  bb.8:
  ; predecessors: %bb.2, %bb.4
    successors: %bb.9

    CALL_VOID @__cxa_end_catch, implicit-def dead $arguments, implicit $sp32, implicit $sp64

  bb.9:
  ; predecessors: %bb.0, %bb.8

    RETURN_VOID implicit-def dead $arguments
  ; CHECK-LABEL: bb.9:
    ; CHECK-NEXT: END_TRY
...
---

# A loop within a try.
#  try {
#    for (int i = 0; i < n; ++i)
#      may_throw();
#  } catch (...) {
#  }
name: test2
# CHECK-LABEL: name: test2
liveins:
  - { reg: '$arguments', reg: '$value_stack' }
body: |
  bb.0:
    successors: %bb.1, %bb.4

    %18:i32 = CONST_I32 0, implicit-def dead $arguments
    LOCAL_SET_I32 1, %18:i32, implicit-def $arguments
    %14:i32 = CONST_I32 0, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %19:i32 = LOCAL_GET_I32 0, implicit-def $arguments
    %9:i32 = GE_S_I32 %14:i32, %19:i32, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    BR_IF %bb.4, %9:i32, implicit-def $arguments

  bb.1:
  ; predecessors: %bb.0, %bb.3
    successors: %bb.3, %bb.2

    CALL_VOID @may_throw, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    BR %bb.3, implicit-def $arguments
  ; CHECK-LABEL: bb.1:
    ; CHECK: LOOP
    ; CHECK: TRY
    ; CHECK-NEXT: CALL_VOID @may_throw

  bb.2 (landing-pad):
  ; predecessors: %bb.1
    successors: %bb.4

    %11:i32 = CATCH_I32 0, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %22:i32 = CALL_I32 @__cxa_begin_catch, %11:i32, implicit-def dead $arguments, implicit $sp32, implicit $sp64, implicit-def $value_stack, implicit $value_stack
    DROP_I32 killed %22:i32, implicit-def $arguments
    CALL_VOID @__cxa_end_catch, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    BR %bb.4, implicit-def $arguments

  bb.3:
  ; predecessors: %bb.1
    successors: %bb.1, %bb.4

    %20:i32 = LOCAL_GET_I32 1, implicit-def $arguments
    %17:i32 = CONST_I32 1, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %16:i32 = ADD_I32 %20:i32, %17:i32, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %15:i32 = LOCAL_TEE_I32 1, %16:i32, implicit-def $arguments
    %21:i32 = LOCAL_GET_I32 0, implicit-def $arguments
    %10:i32 = GE_S_I32 %15:i32, %21:i32, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    BR_UNLESS %bb.1, %10:i32, implicit-def $arguments
  ; CHECK-LABEL: bb.3:
    ; CHECK: END_TRY

  bb.4:
  ; predecessors: %bb.2, %bb.0, %bb.3

    RETURN_VOID implicit-def dead $arguments
...
---

# A loop within a catch
#  try {
#    may_throw();
#  } catch (...) {
#    for (int i = 0; i < n; ++i)
#      dont_throw();
#  }
name: test3
# CHECK-LABEL: name: test3
liveins:
  - { reg: '$arguments', reg: '$value_stack' }
body: |
  bb.0:
    successors: %bb.4, %bb.1

    CALL_VOID @may_throw, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    BR %bb.4, implicit-def $arguments
  ; CHECK-LABEL: bb.0:
    ; CHECK: TRY
    ; CHECK-NEXT: CALL_VOID @may_throw

  bb.1 (landing-pad):
  ; predecessors: %bb.0
    successors: %bb.2, %bb.3

    %9:i32 = CATCH_I32 0, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %18:i32 = CALL_I32 @__cxa_begin_catch, %9:i32, implicit-def dead $arguments, implicit $sp32, implicit $sp64, implicit-def $value_stack, implicit $value_stack
    DROP_I32 killed %18:i32, implicit-def $arguments
    %19:i32 = CONST_I32 0, implicit-def dead $arguments
    LOCAL_SET_I32 1, %19:i32, implicit-def $arguments
    %14:i32 = CONST_I32 0, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %20:i32 = LOCAL_GET_I32 0, implicit-def $arguments
    %10:i32 = GE_S_I32 %14:i32, %20:i32, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    BR_IF %bb.3, %10:i32, implicit-def $arguments, implicit-def $value_stack, implicit $value_stack

  bb.2:
  ; predecessors: %bb.1, %bb.2
    successors: %bb.2, %bb.3

    CALL_VOID @dont_throw, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    %21:i32 = LOCAL_GET_I32 1, implicit-def $arguments
    %17:i32 = CONST_I32 1, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %16:i32 = ADD_I32 %21:i32, %17:i32, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    %15:i32 = LOCAL_TEE_I32 1, %16:i32, implicit-def $arguments
    %22:i32 = LOCAL_GET_I32 0, implicit-def $arguments
    %11:i32 = GE_S_I32 %15:i32, %22:i32, implicit-def dead $arguments, implicit-def $value_stack, implicit $value_stack
    BR_UNLESS %bb.2, %11:i32, implicit-def $arguments, implicit-def $value_stack, implicit $value_stack

  bb.3:
  ; predecessors: %bb.1, %bb.2
    successors: %bb.4

    CALL_VOID @__cxa_end_catch, implicit-def dead $arguments, implicit $sp32, implicit $sp64

  bb.4:
  ; predecessors: %bb.0, %bb.3

    RETURN_VOID implicit-def dead $arguments
  ; CHECK-LABEL: bb.4:
    ; CHECK: END_TRY