| --- | |
| ; RUN: llc %s -march=x86-64 -run-pass=livedebugvalues -o - -force-instr-ref-livedebugvalues=1 -emulate-old-livedebugvalues=0 | FileCheck %s -implicit-check-not=DBG_VALUE |
| |
| ;; When using instruction referencing LiveDebugValues, when a register gets |
| ;; clobbered, we should transfer variable locations to backup locations, if |
| ;; one is available. |
| ;; I've written this test in terms of DBG_VALUEs rather than DBG_INSTR_REFs |
| ;; as this is purely a LiveDebugValues feature, and should work without the |
| ;; need to use any other instructoin referencing work. |
| |
| declare i32 @use() local_unnamed_addr; |
| |
| define i32 @_Z8bb_to_bb() local_unnamed_addr !dbg !12 { |
| entry: |
| br label %bb1, !dbg !17 |
| bb1: |
| br label %bb2, !dbg !17 |
| bb2: |
| br label %bb3, !dbg !17 |
| bb3: |
| br label %bb3, !dbg !17 |
| bb4: |
| br label %bb3, !dbg !17 |
| bb5: |
| ret i32 0, !dbg !17 |
| } |
| |
| !llvm.dbg.cu = !{!0} |
| !llvm.module.flags = !{!7, !8, !9, !10} |
| !llvm.ident = !{!11} |
| !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) |
| !1 = !DIFile(filename: "main.cpp", directory: "F:\") |
| !2 = !{} |
| !3 = !{!4} |
| !4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression()) |
| !5 = distinct !DIGlobalVariable(name: "start", scope: !0, file: !1, line: 4, type: !6, isLocal: false, isDefinition: true) |
| !6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) |
| !7 = !{i32 2, !"Dwarf Version", i32 4} |
| !8 = !{i32 2, !"Debug Info Version", i32 3} |
| !9 = !{i32 1, !"wchar_size", i32 2} |
| !10 = !{i32 7, !"PIC Level", i32 2} |
| !11 = !{!"clang version 10.0.0"} |
| !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) |
| !13 = !DISubroutineType(types: !14) |
| !14 = !{!6, !6} |
| !15 = !{!16} |
| !16 = !DILocalVariable(name: "myVar", scope: !12, file: !1, line: 7, type: !6) |
| !17 = !DILocation(line: 10, scope: !12) |
| |
| ... |
| --- |
| name: _Z8bb_to_bb |
| stack: |
| - { id: 0, type: spill-slot, offset: -12, size: 4, alignment: 4 } |
| body: | |
| bb.0.entry: |
| $eax = MOV32ri 0, debug-location !17 |
| $eax = COPY $ebx |
| DBG_VALUE $eax, $noreg, !16, !DIExpression(), debug-location !17 |
| ;; Over-write eax, we should recover its location as being in ebx. |
| $eax = MOV32ri 0, debug-location !17 |
| |
| ; CHECK: DBG_VALUE $eax |
| ; CHECK-NEXT: $eax = MOV32ri 0 |
| ; CHECK-NEXT: DBG_VALUE $ebx |
| |
| ;; The same should occur for spills. |
| $ebx = MOV32ri 2, debug-location !17 |
| MOV32mr $rsp, 1, _, -12, _, killed $ebx :: (store 4 into %stack.0) |
| DBG_VALUE $ebx, $noreg, !16, !DIExpression(), debug-location !17 |
| $ebx = MOV32ri 0, debug-location !17 |
| |
| ; CHECK-NEXT: $ebx = MOV32ri 2 |
| ; CHECK-NEXT: MOV32mr $rsp |
| ; CHECK-NEXT: DBG_VALUE $ebx |
| ; CHECK-NEXT: $ebx = MOV32ri |
| ; CHECK-NEXT: DBG_VALUE $rsp |
| |
| ;; Now test copies and register masks. |
| $eax = COPY $ebx |
| DBG_VALUE $ebx, $noreg, !16, !DIExpression(), debug-location !17 |
| ;; Overwrite ebx with a copy. |
| $ecx = MOV32ri 1, debug-location !17 |
| $ebx = COPY $ecx |
| |
| ; CHECK: DBG_VALUE $ebx |
| ; CHECK-NEXT: $ecx = MOV32ri |
| ; CHECK-NEXT: $ebx = COPY |
| ; CHECK-NEXT: DBG_VALUE $eax |
| |
| ;; Similarly, with a register mask |
| $ebx = COPY $eax |
| CALL64pcrel32 @use, csr_64, implicit $rsp, implicit $edi, implicit-def $rsp, debug-location !17 |
| |
| ; CHECK-NEXT: $ebx = COPY $eax |
| ; CHECK-NEXT: CALL64pcrel32 |
| ; CHECK-NEXT: DBG_VALUE $ebx |
| |
| RET64 $eax, debug-location !17 |
| ... |