# After adding new debug instruction for labels, it is possible to have
# debug instructions before DBG_VALUE. When querying DBG_VALUE's slot
# index using previous instruction and the previous instruction is debug
# instruction, it will trigger an assertion as using debug instruction
# to get slot index. This test is to emulate the case when DBG_VALUE's
# previous instruction is DBG_LABEL in LiveDebugVariables pass.
#
# RUN: llc -run-pass=livedebugvars -run-pass=virtregrewriter -o - %s | FileCheck %s
--- |
target triple = "x86_64-unknown-linux-gnu"
define i32 @foo(i32 %a, i32 %b) !dbg !4 {
entry:
ret i32 0, !dbg !12
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "debug-var-slot.c", directory: "./")
!2 = !{}
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: true, unit: !0, retainedNodes: !2)
!5 = !DISubroutineType(types: !6)
!6 = !{!7, !7, !7}
!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!8 = !DILabel(scope: !4, name: "top", file: !1, line: 4)
!9 = !DILocation(line: 4, column: 1, scope: !4)
!10 = !DILocalVariable(name: "local_var", scope: !4, file: !1, line: 7, type: !7)
!11 = !DILocation(line: 7, column: 1, scope: !4)
!12 = !DILocation(line: 8, column: 3, scope: !4)
!13 = !DILocalVariable(name: "local_var2", scope: !4, file: !1, line: 7, type: !7)
...
---
name: foo
tracksRegLiveness: true
body: |
bb.0:
DBG_VALUE $esi, $noreg, !13, !DIExpression(), debug-location !11
DBG_LABEL !8, debug-location !9
DBG_VALUE $edi, $noreg, !10, !DIExpression(), debug-location !11
RET 0, undef $eax, debug-location !12
...
# CHECK-LABEL: name: foo
# CHECK: bb.0:
# CHECK-DAG: DBG_LABEL
# CHECK-DAG: DBG_VALUE $esi
# CHECK-DAG: DBG_VALUE $edi
Codebase Browser
llvm