src/llvm-project/llvm/test/DebugInfo/WebAssembly/dbg-value-reg-coloring.mir

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

# Tests for invalid DBG_VALUE set to undef after in RegColoring

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

  declare void @use(i32)

  define void @coalesce_test_0() {
    call void @llvm.dbg.value(metadata i32 0, metadata !5, metadata !DIExpression()), !dbg !10
    ret void
  }
  define void @coalesce_test_1() {
    unreachable
  }
  define void @coalesce_test_2() {
    unreachable
  }
  define void @coalesce_test_3() {
    unreachable
  }
  declare void @llvm.dbg.value(metadata, metadata, metadata)

  !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}
  !5 = !DILocalVariable(name: "var_a", scope: !6, file: !1, line: 2, type: !9)
  !6 = distinct !DISubprogram(name: "coalesce_test_0", scope: !1, file: !1, line: 1, type: !7, scopeLine: 1, unit: !0)
  !7 = !DISubroutineType(types: !8)
  !8 = !{null}
  !9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
  !10 = !DILocation(line: 0, scope: !6)
  !11 = !DILocalVariable(name: "var_b", scope: !6, file: !1, line: 2, type: !9)
  !12 = !DILocalVariable(name: "var_c", scope: !6, file: !1, line: 2, type: !9)
...

---
# %0 and %1 are coalesced in this test
# CHECK-LABEL: name: coalesce_test_0
name: coalesce_test_0
liveins:
  - { reg: '$arguments' }
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $arguments
    %0:i32 = CONST_I32 0, implicit-def $arguments
    ; This should remain the same
    DBG_VALUE %0, $noreg, !5, !DIExpression(), debug-location !10
    ; This should be set to undef, because this is within %0's live range
    DBG_VALUE %1, $noreg, !10, !DIExpression(), debug-location !10
    CALL @use, %0, implicit-def $arguments
    NOP implicit-def $arguments
    %1:i32 = CONST_I32 1, implicit-def $arguments
    ; This should be set to undef, because this is within %1's live range
    DBG_VALUE %0, $noreg, !5, !DIExpression(), debug-location !10
    ; This should remain the same
    DBG_VALUE %1, $noreg, !10, !DIExpression(), debug-location !10
    CALL @use, %1, implicit-def $arguments
    RETURN implicit-def $arguments

  ; CHECK:      %0:i32 = CONST_I32 0
  ; CHECK-NEXT: DBG_VALUE %0, $noreg
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: CALL @use, %0
  ; CHECK-NEXT: NOP
  ; CHECK-NEXT: %0:i32 = CONST_I32 1
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: DBG_VALUE %0, $noreg
  ; CHECK-NEXT: CALL @use, %0
  ; CHECK-NEXT: RETURN implicit-def $arguments
...

---
# A similar test with above, only with more consecutive DBG_VALUEs. These
# consecutive DBG_VALUEs will be handled with a quick last result check.
# CHECK-LABEL: name: coalesce_test_1
name: coalesce_test_1
liveins:
  - { reg: '$arguments' }
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $arguments
    %0:i32 = CONST_I32 0, implicit-def $arguments
    ; All DBG_VALUE %1s in %0's live range will be set to undef
    DBG_VALUE %1, $noreg, !10, !DIExpression(), debug-location !10
    DBG_VALUE %1, $noreg, !10, !DIExpression(), debug-location !10
    DBG_VALUE %0, $noreg, !5, !DIExpression(), debug-location !10
    DBG_VALUE %1, $noreg, !10, !DIExpression(), debug-location !10
    CALL @use, %0, implicit-def $arguments
    NOP implicit-def $arguments
    %1:i32 = CONST_I32 1, implicit-def $arguments
    ; All DBG_VALUE %0s in %1's live range will be set to undef
    DBG_VALUE %0, $noreg, !5, !DIExpression(), debug-location !10
    DBG_VALUE %0, $noreg, !5, !DIExpression(), debug-location !10
    DBG_VALUE %1, $noreg, !10, !DIExpression(), debug-location !10
    DBG_VALUE %0, $noreg, !5, !DIExpression(), debug-location !10
    CALL @use, %1, implicit-def $arguments
    RETURN implicit-def $arguments

  ; CHECK:      %0:i32 = CONST_I32 0
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: DBG_VALUE %0, $noreg
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: CALL @use, %0
  ; CHECK-NEXT: NOP
  ; CHECK-NEXT: %0:i32 = CONST_I32 1
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: DBG_VALUE %0, $noreg
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: CALL @use, %0
  ; CHECK-NEXT: RETURN implicit-def $arguments
...

---
# The same with coalesce_test_0, but the two registers' live ranges are in
# different BBs.
# CHECK-LABEL: name: coalesce_test_2
name: coalesce_test_2
liveins:
  - { reg: '$arguments' }
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $arguments
    %0:i32 = CONST_I32 0, implicit-def $arguments
    DBG_VALUE %0, $noreg, !5, !DIExpression(), debug-location !10
    DBG_VALUE %1, $noreg, !10, !DIExpression(), debug-location !10
    CALL @use, %0, implicit-def $arguments
    BR %bb.1, implicit-def $arguments

  ; CHECK: bb.0:
  ; CHECK:      %0:i32 = CONST_I32 0
  ; CHECK-NEXT: DBG_VALUE %0, $noreg
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: CALL @use, %0
  ; CHECK-NEXT: BR %bb.1

  bb.1:
    %1:i32 = CONST_I32 1, implicit-def $arguments
    DBG_VALUE %0, $noreg, !5, !DIExpression(), debug-location !10
    DBG_VALUE %1, $noreg, !10, !DIExpression(), debug-location !10
    CALL @use, %1, implicit-def $arguments
    RETURN implicit-def $arguments

  ; CHECK: bb.1:
  ; CHECK-NEXT: %0:i32 = CONST_I32 1
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: DBG_VALUE %0, $noreg
  ; CHECK-NEXT: CALL @use, %0
  ; CHECK-NEXT: RETURN implicit-def $arguments
...

---
# Same test with three registers.
# CHECK-LABEL: name: coalesce_test_3
name: coalesce_test_3
liveins:
  - { reg: '$arguments' }
tracksRegLiveness: true
body: |
  bb.0:
    liveins: $arguments
    %0:i32 = CONST_I32 0, implicit-def $arguments
    DBG_VALUE %0, $noreg, !5, !DIExpression(), debug-location !10
    DBG_VALUE %1, $noreg, !10, !DIExpression(), debug-location !10
    DBG_VALUE %2, $noreg, !11, !DIExpression(), debug-location !10
    CALL @use, %0, implicit-def $arguments
    NOP implicit-def $arguments
    %1:i32 = CONST_I32 1, implicit-def $arguments
    DBG_VALUE %0, $noreg, !5, !DIExpression(), debug-location !10
    DBG_VALUE %1, $noreg, !10, !DIExpression(), debug-location !10
    DBG_VALUE %2, $noreg, !11, !DIExpression(), debug-location !10
    CALL @use, %1, implicit-def $arguments
    NOP implicit-def $arguments
    %2:i32 = CONST_I32 2, implicit-def $arguments
    DBG_VALUE %0, $noreg, !5, !DIExpression(), debug-location !10
    DBG_VALUE %1, $noreg, !10, !DIExpression(), debug-location !10
    DBG_VALUE %2, $noreg, !11, !DIExpression(), debug-location !10
    CALL @use, %2, implicit-def $arguments
    RETURN implicit-def $arguments

  ; CHECK:      %0:i32 = CONST_I32 0
  ; CHECK-NEXT: DBG_VALUE %0, $noreg
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: CALL @use, %0
  ; CHECK-NEXT: NOP
  ; CHECK-NEXT: %0:i32 = CONST_I32 1
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: DBG_VALUE %0, $noreg
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: CALL @use, %0
  ; CHECK-NEXT: NOP
  ; CHECK-NEXT: %0:i32 = CONST_I32 2
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: DBG_VALUE $noreg, $noreg
  ; CHECK-NEXT: DBG_VALUE %0, $noreg
  ; CHECK-NEXT: CALL @use, %0
  ; CHECK-NEXT: RETURN implicit-def $arguments
---