llvm/test/DebugInfo/WebAssembly/dbg-loc-reg-stackify.mir

# RUN: llc -run-pass wasm-reg-stackify %s -o - | FileCheck %s

--- |
  target triple = "wasm32-unknown-unknown"

  declare void @use(i32)

  define void @sink_same_bb() {
    unreachable
  }
  define void @clone_same_bb() {
    unreachable
  }
  define void @clone_different_bb_0() {
    unreachable
  }
  define void @clone_different_bb_1() {
    unreachable
  }

  !llvm.dbg.cu = !{!0}
  !llvm.module.flags = !{!2, !3, !4}

  !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, emissionKind: FullDebug)
  !1 = !DIFile(filename: "test.c", directory: "")
  !2 = !{i32 7, !"Dwarf Version", i32 5}
  !3 = !{i32 2, !"Debug Info Version", i32 3}
  !4 = !{i32 1, !"wchar_size", i32 4}
  !6 = distinct !DISubprogram(name: "sink_same_bb", scope: !1, file: !1, line: 1, type: !7, scopeLine: 1, unit: !0)
  !7 = !DISubroutineType(types: !8)
  !8 = !{null}
...

---
# Sinking within the same BB preserves the debug location.
# CHECK-LABEL: name: sink_same_bb
name: sink_same_bb
liveins:
  - { reg: '$arguments' }
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $arguments
    %0:i32 = CONST_I32 1, implicit-def $arguments, debug-location !DILocation(line:10, scope:!6)
    NOP implicit-def $arguments
    CALL @use, %0:i32, implicit-def $arguments
    RETURN implicit-def $arguments

  ; CHECK:      %0:i32 = CONST_I32 1, {{.*}}, debug-location !DILocation(line: 10
  ; CHECK-NEXT: CALL @use
...

---
# Cloning within the same BB preserves the debug location.
# CHECK-LABEL: name: clone_same_bb
name: clone_same_bb
liveins:
  - { reg: '$arguments' }
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $arguments
    %0:i32 = CONST_I32 1, implicit-def $arguments, debug-location !DILocation(line:10, scope:!6)
    NOP implicit-def $arguments
    CALL @use, %0:i32, implicit-def $arguments
    CALL @use, %0:i32, implicit-def $arguments
    RETURN implicit-def $arguments

  ; CHECK:      CALL @use
  ; CHECK-NEXT: %1:i32 = CONST_I32 1, {{.*}}, debug-location !DILocation(line: 10
  ; CHECK-NEXT: CALL @use
...

---
# Cloning to a different BB preserves the debug location in this case because
# the destination BB has an instruction that has the same debug location
# (test.c:10).
# CHECK-LABEL: name: clone_different_bb_0
name: clone_different_bb_0
liveins:
  - { reg: '$arguments' }
tracksRegLiveness: true
body: |
  bb.0:
    successors: %bb.1
    liveins: $arguments
    %0:i32 = CONST_I32 1, implicit-def $arguments, debug-location !DILocation(line:10, scope:!6)
    BR %bb.1, implicit-def $arguments

  bb.1:
  ; predecessors: %bb.0
    CALL @use, %0:i32, implicit-def $arguments, debug-location !DILocation(line:10, scope:!6)
    RETURN implicit-def $arguments

  ; CHECK: bb.1:
  ; CHECK:      %1:i32 = CONST_I32 1, {{.*}}, debug-location !DILocation(line: 10
  ; CHECK-NEXT: CALL @use, %1, {{.*}}, debug-location !DILocation(line: 10
...

---
# Cloning to a different BB does NOT preserve the debug location in this case
# because the destination BB doesn't have an instruction that has the same debug
# location (It has test.c:20 but not test.c:10).
# CHECK-LABEL: name: clone_different_bb_1
name: clone_different_bb_1
liveins:
  - { reg: '$arguments' }
tracksRegLiveness: true
body: |
  bb.0:
    successors: %bb.1
    liveins: $arguments
    %0:i32 = CONST_I32 1, implicit-def $arguments, debug-location !DILocation(line:10, scope:!6)
    BR %bb.1, implicit-def $arguments

  bb.1:
  ; predecessors: %bb.0
    CALL @use, %0:i32, implicit-def $arguments, debug-location !DILocation(line:20, scope:!6)
    RETURN implicit-def $arguments

  ; CHECK: bb.1:
  ; CHECK:      %1:i32 = CONST_I32 1
  ; CHECK-NOT:  %1:i32 = CONST_I32 1, {{.*}}, debug-location !DILocation(line: 10
  ; CHECK-NEXT: CALL @use, %1, {{.*}}, debug-location !DILocation(line: 20
...