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1--- |2 ; RUN: llc %s -mtriple=x86_64 -run-pass=livedebugvalues -o - -experimental-debug-variable-locations | FileCheck %s -implicit-check-not=DBG_VALUE3 4 define i32 @_Z8bb_to_bb() local_unnamed_addr !dbg !12 {5 entry:6 ret i32 0, !dbg !177 }8 9 !llvm.dbg.cu = !{!0}10 !llvm.module.flags = !{!7, !8, !9, !10}11 !llvm.ident = !{!11}12 !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)13 !1 = !DIFile(filename: "main.cpp", directory: "F:\")14 !2 = !{}15 !3 = !{!4}16 !4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())17 !5 = distinct !DIGlobalVariable(name: "start", scope: !0, file: !1, line: 4, type: !6, isLocal: false, isDefinition: true)18 !6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)19 !7 = !{i32 2, !"Dwarf Version", i32 4}20 !8 = !{i32 2, !"Debug Info Version", i32 3}21 !9 = !{i32 1, !"wchar_size", i32 2}22 !10 = !{i32 7, !"PIC Level", i32 2}23 !11 = !{!"clang version 10.0.0"}24 !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)25 !13 = !DISubroutineType(types: !14)26 !14 = !{!6, !6}27 !15 = !{!16}28 !16 = !DILocalVariable(name: "myVar", scope: !12, file: !1, line: 7, type: !6)29 !17 = !DILocation(line: 10, scope: !12)30 31...32---33name: _Z8bb_to_bb34debugInstrRef: true35debugValueSubstitutions:36 - { srcinst: 4, srcop: 0, dstinst: 3, dstop: 0, subreg: 0 }37body: |38 bb.0.entry:39 $rax = MOV64ri 1, debug-instr-number 1, debug-location !1740 ; This debug instruction should identify the value as being in $rax.41 DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !1742 ; CHECK: DBG_VALUE_LIST {{.+}}, $rax43 44 $rbx = COPY killed $rax, debug-location !1745 $rax = MOV64ri 1, debug-location !1746 ; CHECK: DBG_VALUE_LIST {{.+}}, $rbx47 48 DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !1749 ; No instruction is labelled with the number "2". This should produce an50 ; empty variable location.51 ; CHECK: DBG_VALUE_LIST {{.+}}, $noreg52 53 $rbx = MOV64ri 1, debug-instr-number 3, debug-location !1754 JMP_1 %bb.155 56 57 ; CHECK-LABEL: bb.1:58 bb.1:59 60 DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(3, 0), debug-location !1761 ; This refers to a value def'd in a parent block -- but it should be62 ; tracked into this block.63 ; CHECK: DBG_VALUE_LIST {{.+}}, $rbx64 JMP_1 %bb.265 66 ; CHECK-LABEL: bb.2:67 bb.2:68 ; Just like any other variable location, live-ins should be created for69 ; any successor blocks.70 ; CHECK: DBG_VALUE_LIST {{.+}}, $rbx71 72 DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(5, 0), debug-location !1773 ; This is a debug use-before-def: the value appears a few instructions74 ; later. Any earlier value should be terminated here, _and_ we should75 ; emit a DBG_VALUE when the value becomes available.76 ; CHECK: DBG_VALUE_LIST {{.+}}, $noreg77 78 $rax = MOV64ri 1, debug-location !1779 $rax = MOV64ri 1, debug-location !1780 $rcx = MOV64ri 1, debug-instr-number 5, debug-location !1781 ; CHECK: DBG_VALUE_LIST {{.+}}, $rcx82 $rax = MOV64ri 1, debug-location !1783 84 DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(6, 0), debug-location !1785 ; Another debug use-before-def, but across block boundaries.86 ; CHECK: DBG_VALUE_LIST {{.+}}, $noreg87 JMP_1 %bb.388 89 ; CHECK-LABEL: bb.3:90 bb.3:91 $rax = MOV64ri 1, debug-location !1792 $rdx = MOV64ri 1, debug-instr-number 6, debug-location !1793 ; CHECK: DBG_VALUE_LIST {{.+}}, $rdx94 95 ; Terminate variable location for next few blocks,96 DBG_VALUE $noreg, $noreg, !16, !DIExpression(), debug-location !1797 ; CHECK: DBG_VALUE $noreg, $noreg98 JMP_1 %bb.499 100 bb.4:101 ; The next three blocks form a debug use-before-def modelling a scenario102 ; where an instruction is sunk (debug inst in bb5, value in bb6). However,103 ; because a different path joins bb.6, we should _not_ add any DBG_VALUE.104 ; A different variable value may enter the block via the other path.105 $rdx = MOV64ri 1, implicit-def $eflags, debug-location !17106 JCC_1 %bb.6, 4, implicit $eflags, debug-location !17107 bb.5:108 DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(7, 0), debug-location !17109 ; CHECK: DBG_VALUE_LIST {{.+}}, $noreg110 JMP_1 %bb.6, debug-location !17111 bb.6:112 $rsi = MOV64ri 1, debug-instr-number 7, debug-location !17113 JMP_1 %bb.7, debug-location !17114 115 ; A use-before-def shouldn't pass another definition of the variable location116 ; or value.117 bb.7:118 DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(8, 0), debug-location !17119 ; CHECK: DBG_VALUE_LIST {{.+}}, $noreg120 DBG_VALUE $rax, $noreg, !16, !DIExpression(), debug-location !17121 ; CHECK: DBG_VALUE $rax, $noreg,122 $rdi = MOV64ri 1, debug-instr-number 8, debug-location !17123 124 ; Loops: use-before-defs should be live-through loops, assuming that nothing125 ; in that loop modifies the variable location.126 bb.8:127 DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(9, 0), debug-location !17128 ; CHECK: DBG_VALUE_LIST {{.+}}, $noreg129 JCC_1 %bb.8, 4, implicit $eflags130 bb.9:131 $rax = MOV64ri 11, debug-instr-number 9, debug-location !17132 ; CHECK: DBG_VALUE_LIST {{.+}}, $rax133 134 ; Likewise, use-before-defs where anything changes the variable location135 ; or value in the loop, should be discarded.136 bb.10:137 ; live-in,138 ; CHECK: DBG_VALUE_LIST {{.+}}, $rax139 DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(10, 0), debug-location !17140 ; CHECK: DBG_VALUE_LIST {{.+}}, $noreg141 142 bb.11:143 $rbx = MOV64ri 1, debug-location !17144 145 bb.12:146 DBG_INSTR_REF !16, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(9, 0), debug-location !17147 ; This still has a value in $rax,148 ; CHECK: DBG_VALUE_LIST {{.+}}, $rax149 JCC_1 %bb.11, 4, implicit $eflags150 151 bb.13:152 ; Live in,153 ; CHECK: DBG_VALUE_LIST {{.+}}, $rax154 $rbx = MOV64ri 11, debug-instr-number 10, debug-location !17155 ; This is instruction 10 referred to in bb.10. However, as the variable156 ; location/value has been modified in the meantime, no DBG_VALUE should be157 ; generated here.158 RET64 $eax, debug-location !17159...160