120 lines
4.5 KiB
YAML
120 lines
4.5 KiB
YAML
--- |
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; RUN: llc %s -march=x86-64 -run-pass=livedebugvalues -o - -experimental-debug-variable-locations | FileCheck %s -implicit-check-not=DBG_VALUE
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;
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; Test that InstrRefBasedLDV / livedebugvalues doesn't crash when it sees
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; illegal instruction referencing debug-info. This can be caused by
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; optimisations not updating debug-info or doing it incorrectly, which is
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; inevitable. When that happens, we should safely drop the variable location,
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; but not crash.
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define i32 @_Z8bb_to_bb() local_unnamed_addr !dbg !12 {
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entry:
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ret i32 0, !dbg !17
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8, !9, !10}
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!llvm.ident = !{!11}
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!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)
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!1 = !DIFile(filename: "main.cpp", directory: "F:\")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
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!5 = distinct !DIGlobalVariable(name: "start", scope: !0, file: !1, line: 4, type: !6, isLocal: false, isDefinition: true)
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!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!7 = !{i32 2, !"Dwarf Version", i32 4}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{i32 1, !"wchar_size", i32 2}
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!10 = !{i32 7, !"PIC Level", i32 2}
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!11 = !{!"clang version 10.0.0"}
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!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)
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!13 = !DISubroutineType(types: !14)
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!14 = !{!6, !6}
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!15 = !{!16}
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!16 = !DILocalVariable(name: "myVar", scope: !12, file: !1, line: 7, type: !6)
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!17 = !DILocation(line: 10, scope: !12)
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...
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---
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name: _Z8bb_to_bb
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debugValueSubstitutions:
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- { srcinst: 4, srcop: 0, dstinst: 3, dstop: 0, subreg: 0 }
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body: |
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bb.0.entry:
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successors: %bb.1, %bb.2
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; CHECK-LABE: bb.0.entry:
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$rax = MOV64ri 1, debug-instr-number 1, debug-location !17
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DBG_INSTR_REF 1, 0, !16, !DIExpression(), debug-location !17
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;; First check that picking out location works as usual.
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; CHECK: DBG_INSTR_REF 1, 0
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; CHECK-NEXT: DBG_VALUE $rax
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$rax = MOV64ri 1, debug-instr-number 2, debug-location !17
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DBG_INSTR_REF 2, 999, !16, !DIExpression(), debug-location !17
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;; Test out of bounds operand number.
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; CHECK: DBG_INSTR_REF 2, 999
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; CHECK-NEXT: DBG_VALUE $noreg
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$rax = MOV64ri 1, debug-instr-number 3, debug-location !17
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DBG_INSTR_REF 3, 1, !16, !DIExpression(), debug-location !17
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;; Test non-register operand
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; CHECK: DBG_INSTR_REF 3, 1
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; CHECK-NEXT: DBG_VALUE $noreg
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;; FIXME: We should test what happens when this meta-instruction is seen
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;; by livedbugvalues with an instruction number. However, right now it's
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;; impossible to turn the machine-code verifier off when loading MIR?
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;KILL implicit killed $eflags, debug-instr-number 4, debug-location !17
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;DBG_INSTR_REF 4, 0, !16, !DIExpression(), debug-location !17
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;;; Test non-def operand
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;; check: DBG_INSTR_REF 4, 0
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;; check-next: DBG_VALUE $noreg
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$noreg = MOV32ri 1, debug-instr-number 5, debug-location !17
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DBG_INSTR_REF 5, 0, !16, !DIExpression(), debug-location !17
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;; Def of $noreg?
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; CHECK: DBG_INSTR_REF 5, 0
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; CHECK-NEXT: DBG_VALUE $noreg
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JCC_1 %bb.1, 1, implicit $eflags
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JMP_1 %bb.2
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bb.1:
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successors: %bb.3
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; CHECK-LABEL: bb.1:
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DBG_PHI $rax, 6
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DBG_INSTR_REF 6, 1, !16, !DIExpression(), debug-location !17
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;; Test out-of-bounds reference to a DBG_PHI.
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; CHECK: DBG_INSTR_REF 6, 1
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; CHECK-NEXT: DBG_VALUE $noreg
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DBG_PHI $noreg, 7
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JMP_1 %bb.3
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bb.2:
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successors: %bb.3
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; CHECK-LABEL: bb.2:
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DBG_PHI 1, 6
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DBG_INSTR_REF 6, 0, !16, !DIExpression(), debug-location !17
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;; Test non-reg operand to DBG_PHI. It's not clear if this can ever happen
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;; as the result of an optimisation, but lets test for it anyway.
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; CHECK: DBG_INSTR_REF 6, 0
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; CHECK-NEXT: DBG_VALUE $noreg
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DBG_PHI 1, 7
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JMP_1 %bb.3
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bb.3:
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; CHECK-LABEL: bb.3:
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DBG_INSTR_REF 7, 0, !16, !DIExpression(), debug-location !17
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;; PHI resolution of illegal inputs shouldn't crash either. It should also
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;; come out as a $noreg location.
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; CHECK: DBG_INSTR_REF 7, 0
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; CHECK-NEXT: DBG_VALUE $noreg
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RET 0, debug-location !17
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...
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