| # RUN: llc %s -o - -run-pass=livedebugvalues \ |
| # RUN: -experimental-debug-variable-locations \ |
| # RUN: | FileCheck %s |
| # |
| # This test used to cause an infinite loop in InstrRefBasedLDV. Observe block |
| # five: on the first entry the desired variable value is in $rdx and $rcx, on |
| # both paths to the block. However, the block rotates values between those |
| # registers, and feeds a zero-value in too. Ultimately, there is no correct |
| # location for the variable in that block. |
| # This caused an infinite loop in a previous implementation of LiveDebugValues. |
| # Keep this around as a regression test, and check that no location is picked |
| # in block 5. |
| # |
| # CHECK-LABEL: bb.3: |
| # CHECK: DBG_INSTR_REF 7, 0 |
| # CHECK-NEXT: DBG_VALUE $rdx |
| # CHECK-NEXT: $rcx = MOV64rr $rdx |
| # CHECK-LABEL: bb.4: |
| # CHECK: DBG_VALUE $rcx |
| # CHECK-NEXT: $rdx = MOV64rr killed $rcx |
| # CHECK-LABEL: bb.5: |
| # CHEKC-NOT: DBG_VALUE |
| --- | |
| target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| ; Function Attrs: nofree norecurse nosync nounwind readonly uwtable |
| define dso_local void @bees() local_unnamed_addr !dbg !13 { |
| entry: |
| ret void, !dbg !22 |
| } |
| |
| ; Function Attrs: nofree nosync nounwind readnone speculatable willreturn |
| declare void @llvm.dbg.value(metadata, metadata, metadata) |
| |
| !llvm.dbg.cu = !{!2} |
| !llvm.module.flags = !{!8, !9, !10, !11} |
| !llvm.ident = !{!12} |
| |
| !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression()) |
| !1 = distinct !DIGlobalVariable(name: "xmlNormalizeURIPath_path", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true) |
| !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 10.0 (git@github.com:llvm/llvm-project 9d8de79d09c9560c094d90b010e8315fe2712ec2)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None) |
| !3 = !DIFile(filename: "test4.c", directory: "/tmp") |
| !4 = !{} |
| !5 = !{!0} |
| !6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64) |
| !7 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char) |
| !8 = !{i32 7, !"Dwarf Version", i32 4} |
| !9 = !{i32 2, !"Debug Info Version", i32 3} |
| !10 = !{i32 1, !"wchar_size", i32 4} |
| !11 = !{i32 7, !"uwtable", i32 1} |
| !12 = !{!"clang version 10.0 (git@github.com:llvm/llvm-project 9d8de79d09c9560c094d90b010e8315fe2712ec2)"} |
| !13 = distinct !DISubprogram(name: "xmlNormalizeURIPath", scope: !3, file: !3, line: 2, type: !14, scopeLine: 2, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !16) |
| !14 = !DISubroutineType(types: !15) |
| !15 = !{null} |
| !16 = !{!17, !18} |
| !17 = !DILocalVariable(name: "cur", scope: !13, file: !3, line: 3, type: !6) |
| !18 = !DILocalVariable(name: "segp", scope: !19, file: !3, line: 5, type: !6) |
| !19 = distinct !DILexicalBlock(scope: !13, file: !3, line: 4, column: 13) |
| !20 = !DILocation(line: 4, column: 3, scope: !13) |
| !21 = !DILocation(line: 0, scope: !13) |
| !22 = !DILocation(line: 0, scope: !19) |
| !23 = !DILocation(line: 6, column: 5, scope: !19) |
| !24 = !DILocation(line: 6, column: 12, scope: !19) |
| !25 = !{!26, !26, i64 0} |
| !26 = !{!"omnipotent char", !27, i64 0} |
| !27 = !{!"Simple C/C++ TBAA"} |
| !28 = !DILocation(line: 6, column: 27, scope: !19) |
| !29 = !DILocation(line: 7, column: 7, scope: !19) |
| !30 = distinct !{!30, !23, !31, !32, !33} |
| !31 = !DILocation(line: 7, column: 9, scope: !19) |
| !32 = !{!"llvm.loop.mustprogress"} |
| !33 = !{!"llvm.loop.unroll.disable"} |
| |
| ... |
| --- |
| name: bees |
| alignment: 16 |
| tracksRegLiveness: true |
| frameInfo: |
| maxAlignment: 1 |
| maxCallFrameSize: 0 |
| machineFunctionInfo: {} |
| body: | |
| bb.0: |
| $rdx = MOV64ri 0, implicit-def $eflags |
| $esi = MOV32ri 0, implicit-def $eflags |
| |
| bb.1: |
| successors: %bb.2(0x03e0f83e), %bb.1(0x7c1f07c2) |
| liveins: $rcx, $rdi, $rdx, $eflags |
| |
| DBG_PHI $rcx, 2 |
| DBG_INSTR_REF 2, 0, !18, !DIExpression(), debug-location !22 |
| JCC_1 %bb.1, 4, implicit $eflags, debug-location !22 |
| |
| bb.2: |
| successors: %bb.4(0x30000000), %bb.3(0x50000000) |
| liveins: $rcx, $rdi, $eflags |
| |
| JCC_1 %bb.4, 4, implicit $eflags, debug-location !22 |
| |
| bb.3: |
| successors: %bb.5(0x04000000) |
| liveins: $rcx, $rdi, $eflags |
| |
| $rdx = MOV64ri 0, debug-instr-number 7, debug-location !22 |
| DBG_INSTR_REF 7, 0, !18, !DIExpression(), debug-location !22 |
| $rcx = MOV64rr $rdx |
| JMP_1 %bb.5, debug-location !22 |
| |
| bb.4: |
| liveins: $rcx, $rdi, $eflags |
| |
| $rdx = MOV64rr killed $rcx, debug-location !22 |
| |
| bb.5: |
| successors: %bb.5(0x7c000000), %bb.6(0x04000000) |
| liveins: $rdi, $rdx, $eflags |
| |
| $rcx = MOV64rr $rdx, debug-location !22 |
| $rdx = MOV64ri 0 ; jmorse -- disabling this makes variable live-through |
| JCC_1 %bb.5, 6, implicit $eflags, debug-location !22 |
| |
| bb.6: |
| RET64 debug-location !22 |
| |
| ... |