| --- | |
| ; RUN: llc %s -march=x86-64 -run-pass=livedebugvalues -o - -experimental-debug-variable-locations | FileCheck %s -implicit-check-not=DBG_VALUE |
| ; |
| ; Test that InstrRefBasedLDV / livedebugvalues doesn't crash when it sees |
| ; illegal instruction referencing debug-info. This can be caused by |
| ; optimisations not updating debug-info or doing it incorrectly, which is |
| ; inevitable. When that happens, we should safely drop the variable location, |
| ; but not crash. |
| |
| define i32 @_Z8bb_to_bb() local_unnamed_addr !dbg !12 { |
| entry: |
| 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 |
| debugValueSubstitutions: |
| - { srcinst: 4, srcop: 0, dstinst: 3, dstop: 0, subreg: 0 } |
| body: | |
| bb.0.entry: |
| successors: %bb.1, %bb.2 |
| ; CHECK-LABE: bb.0.entry: |
| |
| $rax = MOV64ri 1, debug-instr-number 1, debug-location !17 |
| DBG_INSTR_REF 1, 0, !16, !DIExpression(), debug-location !17 |
| ;; First check that picking out location works as usual. |
| ; CHECK: DBG_INSTR_REF 1, 0 |
| ; CHECK-NEXT: DBG_VALUE $rax |
| |
| $rax = MOV64ri 1, debug-instr-number 2, debug-location !17 |
| DBG_INSTR_REF 2, 999, !16, !DIExpression(), debug-location !17 |
| ;; Test out of bounds operand number. |
| ; CHECK: DBG_INSTR_REF 2, 999 |
| ; CHECK-NEXT: DBG_VALUE $noreg |
| |
| $rax = MOV64ri 1, debug-instr-number 3, debug-location !17 |
| DBG_INSTR_REF 3, 1, !16, !DIExpression(), debug-location !17 |
| ;; Test non-register operand |
| ; CHECK: DBG_INSTR_REF 3, 1 |
| ; CHECK-NEXT: DBG_VALUE $noreg |
| |
| ;; FIXME: We should test what happens when this meta-instruction is seen |
| ;; by livedbugvalues with an instruction number. However, right now it's |
| ;; impossible to turn the machine-code verifier off when loading MIR? |
| ;KILL implicit killed $eflags, debug-instr-number 4, debug-location !17 |
| ;DBG_INSTR_REF 4, 0, !16, !DIExpression(), debug-location !17 |
| ;;; Test non-def operand |
| ;; check: DBG_INSTR_REF 4, 0 |
| ;; check-next: DBG_VALUE $noreg |
| |
| $noreg = MOV32ri 1, debug-instr-number 5, debug-location !17 |
| DBG_INSTR_REF 5, 0, !16, !DIExpression(), debug-location !17 |
| ;; Def of $noreg? |
| ; CHECK: DBG_INSTR_REF 5, 0 |
| ; CHECK-NEXT: DBG_VALUE $noreg |
| |
| JCC_1 %bb.1, 1, implicit $eflags |
| JMP_1 %bb.2 |
| |
| bb.1: |
| successors: %bb.3 |
| ; CHECK-LABEL: bb.1: |
| |
| DBG_PHI $rax, 6 |
| DBG_INSTR_REF 6, 1, !16, !DIExpression(), debug-location !17 |
| ;; Test out-of-bounds reference to a DBG_PHI. |
| ; CHECK: DBG_INSTR_REF 6, 1 |
| ; CHECK-NEXT: DBG_VALUE $noreg |
| |
| DBG_PHI $noreg, 7 |
| JMP_1 %bb.3 |
| |
| bb.2: |
| successors: %bb.3 |
| ; CHECK-LABEL: bb.2: |
| DBG_PHI 1, 6 |
| DBG_INSTR_REF 6, 0, !16, !DIExpression(), debug-location !17 |
| ;; Test non-reg operand to DBG_PHI. It's not clear if this can ever happen |
| ;; as the result of an optimisation, but lets test for it anyway. |
| ; CHECK: DBG_INSTR_REF 6, 0 |
| ; CHECK-NEXT: DBG_VALUE $noreg |
| |
| DBG_PHI 1, 7 |
| JMP_1 %bb.3 |
| |
| bb.3: |
| ; CHECK-LABEL: bb.3: |
| DBG_INSTR_REF 7, 0, !16, !DIExpression(), debug-location !17 |
| ;; PHI resolution of illegal inputs shouldn't crash either. It should also |
| ;; come out as a $noreg location. |
| ; CHECK: DBG_INSTR_REF 7, 0 |
| ; CHECK-NEXT: DBG_VALUE $noreg |
| |
| RET 0, debug-location !17 |
| |
| ... |