159 lines
6.0 KiB
Plaintext
159 lines
6.0 KiB
Plaintext
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--- |
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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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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 }
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body: |
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bb.0.entry:
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$rax = MOV64ri 1, debug-instr-number 1, debug-location !17
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; This debug instruction should identify the value as being in $rax.
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DBG_INSTR_REF 1, 0, !16, !DIExpression(), debug-location !17
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; CHECK: DBG_VALUE $rax, $noreg
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$rbx = COPY killed $rax, debug-location !17
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$rax = MOV64ri 1, debug-location !17
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; Presently, this COPY isn't followed. Dealing with that is future work.
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DBG_INSTR_REF 2, 0, !16, !DIExpression(), debug-location !17
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; No instruction is labelled with the number "2". This should produce an
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; empty variable location.
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; CHECK: DBG_VALUE $noreg, $noreg
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$rbx = MOV64ri 1, debug-instr-number 3, debug-location !17
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JMP_1 %bb.1
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; CHECK-LABEL: bb.1:
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bb.1:
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DBG_INSTR_REF 3, 0, !16, !DIExpression(), debug-location !17
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; This refers to a value def'd in a parent block -- but it should be
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; tracked into this block.
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; CHECK: DBG_VALUE $rbx, $noreg
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JMP_1 %bb.2
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; CHECK-LABEL: bb.2:
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bb.2:
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; Just like any other variable location, live-ins should be created for
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; any successor blocks.
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; CHECK: DBG_VALUE $rbx, $noreg
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DBG_INSTR_REF 5, 0, !16, !DIExpression(), debug-location !17
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; This is a debug use-before-def: the value appears a few instructions
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; later. Any earlier value should be terminated here, _and_ we should
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; emit a DBG_VALUE when the value becomes available.
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; CHECK: DBG_VALUE $noreg, $noreg
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$rax = MOV64ri 1, debug-location !17
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$rax = MOV64ri 1, debug-location !17
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$rcx = MOV64ri 1, debug-instr-number 5, debug-location !17
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; CHECK: DBG_VALUE $rcx, $noreg
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$rax = MOV64ri 1, debug-location !17
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DBG_INSTR_REF 6, 0, !16, !DIExpression(), debug-location !17
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; Another debug use-before-def, but across block boundaries.
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; CHECK: DBG_VALUE $noreg, $noreg
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JMP_1 %bb.3
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; CHECK-LABEL: bb.3:
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bb.3:
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$rax = MOV64ri 1, debug-location !17
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$rdx = MOV64ri 1, debug-instr-number 6, debug-location !17
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; CHECK: DBG_VALUE $rdx, $noreg
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; Terminate variable location for next few blocks,
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DBG_VALUE $noreg, $noreg, !16, !DIExpression(), debug-location !17
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; CHECK: DBG_VALUE $noreg, $noreg
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JMP_1 %bb.4
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bb.4:
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; The next three blocks form a debug use-before-def modelling a scenario
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; where an instruction is sunk (debug inst in bb5, value in bb6). However,
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; because a different path joins bb.6, we should _not_ add any DBG_VALUE.
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; A different variable value may enter the block via the other path.
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$rdx = MOV64ri 1, implicit-def $eflags, debug-location !17
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JCC_1 %bb.6, 4, implicit $eflags, debug-location !17
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bb.5:
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DBG_INSTR_REF 7, 0, !16, !DIExpression(), debug-location !17
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; CHECK: DBG_VALUE $noreg, $noreg
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JMP_1 %bb.6, debug-location !17
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bb.6:
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$rsi = MOV64ri 1, debug-instr-number 7, debug-location !17
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JMP_1 %bb.7, debug-location !17
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; A use-before-def shouldn't pass another definition of the variable location
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; or value.
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bb.7:
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DBG_INSTR_REF 8, 0, !16, !DIExpression(), debug-location !17
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; CHECK: DBG_VALUE $noreg, $noreg
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DBG_VALUE $rax, $noreg, !16, !DIExpression(), debug-location !17
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; CHECK: DBG_VALUE $rax, $noreg,
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$rdi = MOV64ri 1, debug-instr-number 8, debug-location !17
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; Loops: use-before-defs should be live-through loops, assuming that nothing
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; in that loop modifies the variable location.
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bb.8:
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DBG_INSTR_REF 9, 0, !16, !DIExpression(), debug-location !17
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; CHECK: DBG_VALUE $noreg, $noreg
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JCC_1 %bb.8, 4, implicit $eflags
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bb.9:
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$rax = MOV64ri 11, debug-instr-number 9, debug-location !17
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; CHECK: DBG_VALUE $rax, $noreg,
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; Likewise, use-before-defs where anything changes the variable location
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; or value in the loop, should be discarded.
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bb.10:
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; live-in,
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; CHECK: DBG_VALUE $rax, $noreg,
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DBG_INSTR_REF 10, 0, !16, !DIExpression(), debug-location !17
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; CHECK: DBG_VALUE $noreg, $noreg
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bb.11:
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$rbx = MOV64ri 1, debug-location !17
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bb.12:
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DBG_INSTR_REF 9, 0, !16, !DIExpression(), debug-location !17
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; This still has a value in $rax,
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; CHECK: DBG_VALUE $rax, $noreg
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JCC_1 %bb.11, 4, implicit $eflags
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bb.13:
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; Live in,
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; CHECK: DBG_VALUE $rax, $noreg
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$rbx = MOV64ri 11, debug-instr-number 10, debug-location !17
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; This is instruction 10 referred to in bb.10. However, as the variable
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; location/value has been modified in the meantime, no DBG_VALUE should be
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; generated here.
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RETQ $eax, debug-location !17
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...
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