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1# RUN: llc -O1 -start-before=greedy -stop-after=virtregrewriter -o /dev/null %s -debug-only=livedebugvars 2>&1 -experimental-debug-variable-locations=false | FileCheck -check-prefix=CHECKDBG %s2 3# REQUIRES: asserts4 5# This test case was generated by using the following c program:6# extern void foo(int, int);7#8# int bar[2] = {1, 2};9#10# int main(int argc, char** argv)11# {12# int a0 = bar[0];13# int a1 = bar[1];14# foo(a0, a1);15# return 0;16# }17#18# It was compiled with -g and -O1, and the mir was dumped before ra greedy.19 20--- |21 ; ModuleID = 'live-debug-vars-unused-arg.ll'22 source_filename = "live-debug-vars-unused-arg.c"23 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"24 target triple = "x86_64-unknown-linux-gnu"25 26 @bar = local_unnamed_addr global [2 x i32] [i32 1, i32 2], align 4, !dbg !027 28 ; Function Attrs: nounwind uwtable29 define i32 @main(i32 %argc, i8** nocapture readnone %argv) local_unnamed_addr #0 !dbg !14 {30 entry:31 tail call void @llvm.dbg.value(metadata i32 %argc, metadata !21, metadata !DIExpression()), !dbg !2532 tail call void @llvm.dbg.value(metadata i8** %argv, metadata !22, metadata !DIExpression()), !dbg !2633 %0 = load i32, i32* getelementptr inbounds ([2 x i32], [2 x i32]* @bar, i64 0, i64 0), align 4, !dbg !27, !tbaa !2834 tail call void @llvm.dbg.value(metadata i32 %0, metadata !23, metadata !DIExpression()), !dbg !3235 %1 = load i32, i32* getelementptr inbounds ([2 x i32], [2 x i32]* @bar, i64 0, i64 1), align 4, !dbg !33, !tbaa !2836 tail call void @llvm.dbg.value(metadata i32 %1, metadata !24, metadata !DIExpression()), !dbg !3437 tail call void @foo(i32 %0, i32 %1) #2, !dbg !3538 ret i32 0, !dbg !3639 }40 41 declare void @foo(i32, i32) local_unnamed_addr42 43 ; Function Attrs: nounwind readnone speculatable44 declare void @llvm.dbg.value(metadata, metadata, metadata) #145 46 ; Function Attrs: nounwind47 declare void @llvm.stackprotector(i8*, i8**) #248 49 attributes #0 = { nounwind uwtable }50 attributes #1 = { nounwind readnone speculatable }51 attributes #2 = { nounwind }52 53 !llvm.dbg.cu = !{!2}54 !llvm.module.flags = !{!10, !11, !12}55 !llvm.ident = !{!13}56 57 !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())58 !1 = distinct !DIGlobalVariable(name: "bar", scope: !2, file: !3, line: 3, type: !6, isLocal: false, isDefinition: true)59 !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 6.0.0 (trunk 313866) (llvm/trunk 313875)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)60 !3 = !DIFile(filename: "live-debug-vars-unused-arg.c", directory: "/")61 !4 = !{}62 !5 = !{!0}63 !6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 64, elements: !8)64 !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)65 !8 = !{!9}66 !9 = !DISubrange(count: 2)67 !10 = !{i32 2, !"Dwarf Version", i32 4}68 !11 = !{i32 2, !"Debug Info Version", i32 3}69 !12 = !{i32 1, !"wchar_size", i32 4}70 !13 = !{!"clang version 6.0.0 (trunk 313866) (llvm/trunk 313875)"}71 !14 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 5, type: !15, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !20)72 !15 = !DISubroutineType(types: !16)73 !16 = !{!7, !7, !17}74 !17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !18, size: 64)75 !18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64)76 !19 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)77 !20 = !{!21, !22, !23, !24}78 !21 = !DILocalVariable(name: "argc", arg: 1, scope: !14, file: !3, line: 5, type: !7)79 !22 = !DILocalVariable(name: "argv", arg: 2, scope: !14, file: !3, line: 5, type: !17)80 !23 = !DILocalVariable(name: "a0", scope: !14, file: !3, line: 7, type: !7)81 !24 = !DILocalVariable(name: "a1", scope: !14, file: !3, line: 8, type: !7)82 !25 = !DILocation(line: 5, column: 14, scope: !14)83 !26 = !DILocation(line: 5, column: 27, scope: !14)84 !27 = !DILocation(line: 7, column: 12, scope: !14)85 !28 = !{!29, !29, i64 0}86 !29 = !{!"int", !30, i64 0}87 !30 = !{!"omnipotent char", !31, i64 0}88 !31 = !{!"Simple C/C++ TBAA"}89 !32 = !DILocation(line: 7, column: 7, scope: !14)90 !33 = !DILocation(line: 8, column: 12, scope: !14)91 !34 = !DILocation(line: 8, column: 7, scope: !14)92 !35 = !DILocation(line: 9, column: 3, scope: !14)93 !36 = !DILocation(line: 10, column: 3, scope: !14)94 95...96---97name: main98alignment: 1699exposesReturnsTwice: false100legalized: false101regBankSelected: false102selected: false103tracksRegLiveness: true104registers:105 - { id: 0, class: gr32, preferred-register: '' }106 - { id: 1, class: gr64, preferred-register: '' }107 - { id: 2, class: gr32, preferred-register: '' }108 - { id: 3, class: gr32, preferred-register: '' }109 - { id: 4, class: gr32, preferred-register: '' }110liveins:111frameInfo:112 isFrameAddressTaken: false113 isReturnAddressTaken: false114 hasStackMap: false115 hasPatchPoint: false116 stackSize: 0117 offsetAdjustment: 0118 maxAlignment: 0119 adjustsStack: true120 hasCalls: true121 stackProtector: ''122 maxCallFrameSize: 4294967295123 hasOpaqueSPAdjustment: false124 hasVAStart: false125 hasMustTailInVarArgFunc: false126 savePoint: []127 restorePoint: []128fixedStack:129stack:130constants:131body: |132 bb.0.entry:133 DBG_VALUE $edi, _, !21, !DIExpression(), debug-location !25134 DBG_VALUE $rsi, _, !22, !DIExpression(), debug-location !26135 %2 = MOV32rm $rip, 1, _, @bar, _, debug-location !27 :: (dereferenceable load (s32) from `i32* getelementptr inbounds ([2 x i32], [2 x i32]* @bar, i64 0, i64 0)`, !tbaa !28)136 DBG_VALUE %2, _, !23, !DIExpression(), debug-location !32137 %3 = MOV32rm $rip, 1, _, @bar + 4, _, debug-location !33 :: (dereferenceable load (s32) from `i32* getelementptr inbounds ([2 x i32], [2 x i32]* @bar, i64 0, i64 1)`, !tbaa !28)138 DBG_VALUE %3, _, !24, !DIExpression(), debug-location !34139 ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !35140 $edi = COPY %2, debug-location !35141 $esi = COPY %3, debug-location !35142 CALL64pcrel32 @foo, csr_64, implicit $rsp, implicit $ssp, implicit killed $edi, implicit killed $esi, implicit-def $rsp, debug-location !35143 ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp, debug-location !35144 $eax = MOV32r0 implicit-def dead $eflags, debug-location !36145 RET 0, killed $eax, debug-location !36146 147...148 149# Let's verify that the slot index ranges for the unused variables argc/argv,150# connected to physical regs $edi and $rsi, does not overlap with the ranges151# for %2 and %3. The register allocator is actually allocating the152# virtual registers # to $edi and $esi, so the ranges for argc/argv should153# not cover the whole BB.154#155# CHECKDBG-LABEL: ********** EMITTING LIVE DEBUG VARIABLES **********156# CHECKDBG-NEXT: !"argc,5" [0B;0e): 0 Loc0=$edi157# CHECKDBG-NEXT: [0B;0e): 0 %bb.0-160B158# CHECKDBG-NEXT: !"argv,5" [0B;0e): 0 Loc0=$rsi159# CHECKDBG-NEXT: [0B;0e): 0 %bb.0-160B160# CHECKDBG-NEXT: !"a0,7" [16r;64r): 0 Loc0=%2161# CHECKDBG-NEXT: [16r;64r): 0 %bb.0-160B162# CHECKDBG-NEXT: !"a1,8" [32r;80r): 0 Loc0=%3163# CHECKDBG-NEXT: [32r;80r): 0 %bb.0-160B164