113 lines · plain
1--- |2 ; RUN: llc %s -mtriple=x86_64 -run-pass=livedebugvalues -o - -force-instr-ref-livedebugvalues=1 -emulate-old-livedebugvalues=0 | FileCheck %s -implicit-check-not=DBG_VALUE3 4 ;; When using instruction referencing LiveDebugValues, when a register gets5 ;; clobbered, we should transfer variable locations to backup locations, if6 ;; one is available.7 ;; I've written this test in terms of DBG_VALUEs rather than DBG_INSTR_REFs8 ;; as this is purely a LiveDebugValues feature, and should work without the9 ;; need to use any other instructoin referencing work.10 11 declare i32 @use() local_unnamed_addr;12 13 define i32 @_Z8bb_to_bb() local_unnamed_addr !dbg !12 {14 entry:15 br label %bb1, !dbg !1716 bb1:17 br label %bb2, !dbg !1718 bb2:19 br label %bb3, !dbg !1720 bb3:21 br label %bb3, !dbg !1722 bb4:23 br label %bb3, !dbg !1724 bb5:25 ret i32 0, !dbg !1726 }27 28 !llvm.dbg.cu = !{!0}29 !llvm.module.flags = !{!7, !8, !9, !10}30 !llvm.ident = !{!11}31 !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)32 !1 = !DIFile(filename: "main.cpp", directory: "F:\")33 !2 = !{}34 !3 = !{!4}35 !4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())36 !5 = distinct !DIGlobalVariable(name: "start", scope: !0, file: !1, line: 4, type: !6, isLocal: false, isDefinition: true)37 !6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)38 !7 = !{i32 2, !"Dwarf Version", i32 4}39 !8 = !{i32 2, !"Debug Info Version", i32 3}40 !9 = !{i32 1, !"wchar_size", i32 2}41 !10 = !{i32 7, !"PIC Level", i32 2}42 !11 = !{!"clang version 10.0.0"}43 !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)44 !13 = !DISubroutineType(types: !14)45 !14 = !{!6, !6}46 !15 = !{!16}47 !16 = !DILocalVariable(name: "myVar", scope: !12, file: !1, line: 7, type: !6)48 !17 = !DILocation(line: 10, scope: !12)49 50...51---52name: _Z8bb_to_bb53debugInstrRef: true54stack:55 - { id: 0, type: spill-slot, offset: -12, size: 4, alignment: 4 }56body: |57 bb.0.entry:58 $eax = MOV32ri 0, debug-location !1759 $eax = COPY $ebx60 DBG_VALUE $eax, $noreg, !16, !DIExpression(), debug-location !1761 ;; Over-write eax, we should recover its location as being in ebx.62 $eax = MOV32ri 0, debug-location !1763 64 ; CHECK: DBG_VALUE $eax65 ; CHECK-NEXT: $eax = MOV32ri 066 ; CHECK-NEXT: DBG_VALUE $ebx67 68 ;; The same should occur for spills.69 $ebx = MOV32ri 2, debug-location !1770 MOV32mr $rsp, 1, _, -12, _, killed $ebx :: (store 4 into %stack.0)71 DBG_VALUE $ebx, $noreg, !16, !DIExpression(), debug-location !1772 $ebx = MOV32ri 0, debug-location !1773 74 ; CHECK-NEXT: $ebx = MOV32ri 275 ; CHECK-NEXT: MOV32mr $rsp76 ; CHECK-NEXT: DBG_VALUE $ebx77 ; CHECK-NEXT: $ebx = MOV32ri78 ; CHECK-NEXT: DBG_VALUE $rsp79 80 ;; Try re-loading the variable value from the stack; we shouldn't issue a81 ;; DBG_VALUE to follow it, the stack locations are usually longer lived and82 ;; this reduces location list entropy. Then, clobber the stack location,83 ;; and check that we can relocate the variable to being in the loaded84 ;; register.85 $ebx = MOV32rm $rsp, 1, _, -12, _ :: (load 4 from %stack.0)86 MOV32mr $rsp, 1, _, -12, _, killed $esi :: (store 4 into %stack.0)87 ; CHECK: $ebx = MOV32rm88 ; CHECK-NEXT: MOV32mr $rsp89 ; CHECK-NEXT: DBG_VALUE $ebx90 91 ;; Now test copies and register masks.92 $eax = COPY $ebx93 DBG_VALUE $ebx, $noreg, !16, !DIExpression(), debug-location !1794 ;; Overwrite ebx with a copy.95 $ecx = MOV32ri 1, debug-location !1796 $ebx = COPY $ecx97 98 ; CHECK: DBG_VALUE $ebx99 ; CHECK-NEXT: $ecx = MOV32ri100 ; CHECK-NEXT: $ebx = COPY101 ; CHECK-NEXT: DBG_VALUE $eax102 103 ;; Similarly, with a register mask104 $ebx = COPY $eax105 CALL64pcrel32 @use, csr_64, implicit $rsp, implicit $edi, implicit-def $rsp, debug-location !17106 107 ; CHECK-NEXT: $ebx = COPY $eax108 ; CHECK-NEXT: CALL64pcrel32109 ; CHECK-NEXT: DBG_VALUE $ebx110 111 RET64 $eax, debug-location !17112...113