114 lines
4.5 KiB
Plaintext
114 lines
4.5 KiB
Plaintext
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; RUN: llc %s -march=x86-64 -run-pass=livedebugvalues -o - -experimental-debug-variable-locations -emulate-old-livedebugvalues=0 | FileCheck %s -implicit-check-not=DBG_VALUE
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; Sometimes, variables can have multiple locations, and when control flow
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; merges LiveDebugValues has a hard time picking which one the variable lives
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; in. Test two of these scenarios that old LiveDebugValues can't handle: when
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; a value is in two registers, and when a value is both in a register and
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; on the stack.
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; In a register:
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; CHECK-LABEL: bb.0.entry:
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; CHECK: DBG_VALUE $rdi, $noreg, !16, !DIExpression()
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; CHECK-LABEL: bb.1.bb1:
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; CHECK: DBG_VALUE $rbp, $noreg, !16, !DIExpression()
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; CHECK: DBG_VALUE $rbp, $noreg, !16, !DIExpression()
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; CHECK-LABEL: bb.2.bb2:
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; CHECK: DBG_VALUE $rbp, $noreg, !16, !DIExpression()
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; CHECK-LABEL: bb.3.bb3:
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; CHECK: DBG_VALUE $rbp, $noreg, !16, !DIExpression()
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; On the stack: we move from $rbp to a stack slot in bb4, but join back on
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; $rbp in bb6.
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; CHECK-LABEL: bb.4:
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; CHECK: DBG_VALUE $rbp, $noreg, !16, !DIExpression()
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; CHECK: DBG_VALUE $rsp, 0, !16, !DIExpression()
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; CHECK-LABEL: bb.5:
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; CHECK: DBG_VALUE $rbp, $noreg, !16, !DIExpression()
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; CHECK-LABEL: bb.6:
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; CHECK: DBG_VALUE $rbp, $noreg, !16, !DIExpression()
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declare i64 @bees(i64 %arg);
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define i32 @_Z8bb_to_bb(i64 %arg) local_unnamed_addr !dbg !12 {
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entry:
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br label %bb1, !dbg !17
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bb1:
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br label %bb2, !dbg !17
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bb2:
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br label %bb3, !dbg !17
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bb3:
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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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tracksRegLiveness: true
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liveins:
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- { reg: '$rdi', virtual-reg: '' }
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stack:
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- { id: 0, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8,
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stack-id: default, callee-saved-register: '', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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body: |
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bb.0.entry:
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liveins: $rdi
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successors: %bb.1, %bb.2
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DBG_VALUE $rdi, $noreg, !16, !DIExpression(), debug-location !17
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$rbp = MOV64rr $rdi, debug-location !17
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dead $rcx = MOV64ri 0, debug-location !17
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CALL64pcrel32 @bees, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def $rax, debug-location !17
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CMP64ri8 renamable $rax, 1, implicit-def $eflags, debug-location !17
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JCC_1 %bb.2, 4, implicit killed $eflags, debug-location !17
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bb.1.bb1:
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liveins: $rax, $rbp
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successors: %bb.3
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$rbp = MOV64ri 0, debug-location !17
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DBG_VALUE $rbp, $noreg, !16, !DIExpression(), debug-location !17
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JMP_1 %bb.3
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bb.2.bb2:
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liveins: $rax, $rbp
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successors: %bb.3
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$rax = MOV64ri 0, debug-location !17
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bb.3.bb3:
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liveins: $rax, $rbp
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$rdi = MOV64rr $rbp, debug-location !17
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CALL64pcrel32 @bees, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def $rax, debug-location !17
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CMP64ri8 renamable $rax, 1, implicit-def $eflags, debug-location !17
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JCC_1 %bb.5, 4, implicit killed $eflags, debug-location !17
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bb.4:
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liveins: $rax, $rbp
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MOV64mr $rsp, 1, $noreg, 8, $noreg, killed renamable $rbp :: (store 8 into %stack.0)
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JMP_1 %bb.6
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bb.5:
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liveins: $rax, $rbp
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bb.6:
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liveins: $rax, $rbp
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RETQ $rax, debug-location !17
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...
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