--- |
; RUN: llc %s -march=x86-64 -run-pass=livedebugvalues -o - -experimental-debug-variable-locations | FileCheck %s -implicit-check-not=DBG_VALUE
;
; Test that InstrRefBasedLDV / livedebugvalues doesn't crash when it sees
; illegal instruction referencing debug-info. This can be caused by
; optimisations not updating debug-info or doing it incorrectly, which is
; inevitable. When that happens, we should safely drop the variable location,
; but not crash.
define i32 @_Z8bb_to_bb() local_unnamed_addr !dbg !12 {
entry:
ret i32 0, !dbg !17
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!7, !8, !9, !10}
!llvm.ident = !{!11}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3, debugInfoForProfiling: true, nameTableKind: None)
!1 = !DIFile(filename: "main.cpp", directory: "F:\")
!2 = !{}
!3 = !{!4}
!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
!5 = distinct !DIGlobalVariable(name: "start", scope: !0, file: !1, line: 4, type: !6, isLocal: false, isDefinition: true)
!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!7 = !{i32 2, !"Dwarf Version", i32 4}
!8 = !{i32 2, !"Debug Info Version", i32 3}
!9 = !{i32 1, !"wchar_size", i32 2}
!10 = !{i32 7, !"PIC Level", i32 2}
!11 = !{!"clang version 10.0.0"}
!12 = distinct !DISubprogram(name: "bb_to_bb", linkageName: "bb_to_bb", scope: !1, file: !1, line: 6, type: !13, scopeLine: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !15)
!13 = !DISubroutineType(types: !14)
!14 = !{!6, !6}
!15 = !{!16}
!16 = !DILocalVariable(name: "myVar", scope: !12, file: !1, line: 7, type: !6)
!17 = !DILocation(line: 10, scope: !12)
...
---
name: _Z8bb_to_bb
debugInstrRef: true
debugValueSubstitutions:
- { srcinst: 4, srcop: 0, dstinst: 3, dstop: 0, subreg: 0 }
body: |
bb.0.entry:
successors: %bb.1, %bb.2
; CHECK-LABE: bb.0.entry:
$rax = MOV64ri 1, debug-instr-number 1, debug-location !17
DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !17
;; First check that picking out location works as usual.
; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0)
; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $rax
$rax = MOV64ri 1, debug-instr-number 2, debug-location !17
DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 999), debug-location !17
;; Test out of bounds operand number.
; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(2, 999)
; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $noreg
$rax = MOV64ri 1, debug-instr-number 3, debug-location !17
DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(3, 1), debug-location !17
;; Test non-register operand
; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(3, 1)
; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $noreg
;; FIXME: We should test what happens when this meta-instruction is seen
;; by livedbugvalues with an instruction number. However, right now it's
;; impossible to turn the machine-code verifier off when loading MIR?
;KILL implicit killed $eflags, debug-instr-number 4, debug-location !17
;DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(4, 0), debug-location !17
;;; Test non-def operand
;; check: DBG_INSTR_REF {{.+}}, dbg-instr-ref(4, 0)
;; check-next: DBG_VALUE_LIST {{.+}}, $noreg
$noreg = MOV32ri 1, debug-instr-number 5, debug-location !17
DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(5, 0), debug-location !17
;; Def of $noreg?
; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(5, 0)
; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $noreg
JCC_1 %bb.1, 1, implicit $eflags
JMP_1 %bb.2
bb.1:
successors: %bb.3
; CHECK-LABEL: bb.1:
DBG_PHI $rax, 6
DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(6, 1), debug-location !17
;; Test out-of-bounds reference to a DBG_PHI.
; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(6, 1)
; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $noreg
DBG_PHI $noreg, 7
JMP_1 %bb.3
bb.2:
successors: %bb.3
; CHECK-LABEL: bb.2:
DBG_PHI 1, 6
DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(6, 0), debug-location !17
;; Test non-reg operand to DBG_PHI. It's not clear if this can ever happen
;; as the result of an optimisation, but lets test for it anyway.
; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(6, 0)
; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $noreg
DBG_PHI 1, 7
JMP_1 %bb.3
bb.3:
; CHECK-LABEL: bb.3:
DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(7, 0), debug-location !17
;; PHI resolution of illegal inputs shouldn't crash either. It should also
;; come out as a $noreg location.
; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(7, 0)
; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $noreg
RET 0, debug-location !17
...
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