1# RUN: llc %s -mtriple=x86_64 -run-pass=livedebugvalues \ 2# RUN: -mtriple x86_64-unknown-unknown \ 3# RUN: -experimental-debug-variable-locations -o - 2>&1 \ 4# RUN: | FileCheck %s 5# 6# Test that memory operands of instructions are interpreted by LiveDebugValues: 7# if an instruction reference is substituted to a memory operand, we should be 8# able to emit a DBG_VALUE referring to its slot. 9# 10# In addition, further instructions that write to the same stack slot should 11# be recognised as clobbering the value in that slot. 12--- | 13 define i8 @test(i32 %bar) local_unnamed_addr !dbg !7 { 14 entry: 15 ret i8 0, !dbg !12 16 } 17 18 declare dso_local void @ext(i64) 19 20 !llvm.dbg.cu = !{!0} 21 !llvm.module.flags = !{!3, !4, !5, !6} 22 !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug) 23 !1 = !DIFile(filename: "foo.cpp", directory: ".") 24 !2 = !DIBasicType(name: "int", size: 8, encoding: DW_ATE_signed) 25 !3 = !{i32 2, !"Dwarf Version", i32 4} 26 !4 = !{i32 2, !"Debug Info Version", i32 3} 27 !5 = !{i32 1, !"wchar_size", i32 2} 28 !6 = !{i32 7, !"PIC Level", i32 2} 29 !7 = distinct !DISubprogram(name: "foo", linkageName: "foo", scope: !1, file: !1, line: 6, type: !8, scopeLine: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !10) 30 !8 = !DISubroutineType(types: !9) 31 !9 = !{!2, !2} 32 !10 = !{!11} 33 !11 = !DILocalVariable(name: "baz", scope: !7, file: !1, line: 7, type: !2) 34 !12 = !DILocation(line: 10, scope: !7) 35... 36--- 37name: test 38tracksRegLiveness: true 39debugInstrRef: true 40liveins: 41 - { reg: '$rdi', virtual-reg: '' } 42debugValueSubstitutions: 43- { srcinst: 2, srcop: 0, dstinst: 3, dstop: 1000000, subreg: 0 } 44- { srcinst: 4, srcop: 0, dstinst: 5, dstop: 1000000, subreg: 0 } 45stack: 46 - { id: 0, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8, 47 stack-id: default, callee-saved-register: '', callee-saved-restored: true, 48 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' } 49body: | 50 bb.0: 51 liveins: $rdi, $rax 52 DBG_PHI $rax, 1 53 MOV64mr $rsp, 1, $noreg, 16, $noreg, $rdi :: (store 8 into %stack.0) 54 $rax = MOV64ri 0, debug-location !12 55 INC32m $rsp, 1, $noreg, 4, $noreg, implicit-def dead $eflags, debug-instr-number 3, debug-location !DILocation(line: 0, scope: !7) :: (store (s32) into %stack.0) 56 DBG_INSTR_REF !11, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !12 57 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(2, 0) 58 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $rsp 59 ;; Test that the old value (from the DBG_PHI) is not tracked anywhere. It 60 ;; should not be considered as being on the stack any more. 61 DBG_INSTR_REF !11, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !12 62 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0) 63 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $noreg 64 INC32m $rsp, 1, $noreg, 4, $noreg, implicit-def dead $eflags, debug-location !12 :: (store (s32) into %stack.0) 65 ;; The above INC32m should be detected as clobbering the stack location, 66 ;; even though it isn't debug labelled. 67 DBG_INSTR_REF !11, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !12 68 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(2, 0) 69 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $noreg 70 71 ;; Store another debug-labelled value to the stack, 72 INC32m $rsp, 1, $noreg, 4, $noreg, implicit-def dead $eflags, debug-instr-number 5, debug-location !DILocation(line: 0, scope: !7) :: (store (s32) into %stack.0) 73 ;; Point the variable at that value. 74 DBG_INSTR_REF !11, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(4, 0), debug-location !12 75 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(4, 0), 76 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $rsp 77 ;; Overwrite the stack: LiveDebugValues should explicitly undef the stack 78 ;; location with DBG_VALUE_LIST $noreg, as DbgEntityHistoryCalculator doesn't 79 ;; look at the stack. 80 INC32m $rsp, 1, $noreg, 4, $noreg, implicit-def dead $eflags, debug-location !DILocation(line: 0, scope: !7) :: (store (s32) into %stack.0) 81 ; CHECK: INC32m $rsp 82 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $noreg 83 84 $rax = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load 8 from %stack.0) 85 RET64 $rax, debug-location !12 86... 87