llvm-project/llvm/test/CodeGen/WebAssembly/eh-labels.mir

# RUN: llc -mtriple=wasm32-unknown-unknown -exception-model=wasm -mattr=+exception-handling -run-pass wasm-late-eh-prepare -run-pass wasm-cfg-stackify %s -o - | FileCheck %s

# This tests 'try' and 'catch' instructions are correctly placed with respect to
# EH_LABEL instructions.
--- |
  target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
  target triple = "wasm32-unknown-unknown"

  declare i32 @__gxx_wasm_personality_v0(...)
  declare void @foo()
  define void @eh_label_test() personality i8* bitcast (i32 (...)* @__gxx_wasm_personality_v0 to i8*) {
    ret void
  }
...

---
# CHECK-LABEL: eh_label_test
name: eh_label_test
liveins:
  - { reg: '$arguments' }
body: |
  bb.0:
    ; TRY should be before EH_LABEL wrappers of throwing calls
    ; CHECK:      TRY
    ; CHECK-NEXT: EH_LABEL
    ; CHECK-NEXT: CALL_VOID @foo
    ; CHECK-NEXT: EH_LABEL
    successors: %bb.1, %bb.2
    EH_LABEL <mcsymbol .Ltmp0>
    CALL_VOID @foo, implicit-def dead $arguments, implicit $sp32, implicit $sp64
    EH_LABEL <mcsymbol .Ltmp1>

  bb.1 (landing-pad):
  ; predecessors: %bb.0
    successors: %bb.2
    ; CATCH should be after an EH_LABEL at the beginning of an EH pad
    ; CHECK:      EH_LABEL
    ; CHECK-NEXT: CATCH
    EH_LABEL <mcsymbol .Ltmp2>
    dead %0:i32 = EXTRACT_EXCEPTION_I32 implicit-def dead $arguments
    CATCHRET %bb.2, %bb.0, implicit-def dead $arguments

  bb.2:
  ; predecessors: %bb.0, %bb.1
    RETURN implicit-def dead $arguments
...