1 # RUN: llc %s -march=x86-64 -run-pass=livedebugvalues \
2 # RUN: -mtriple x86_64-unknown-unknown \
3 # RUN: -experimental-debug-variable-locations -o - 2>&1 \
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.
10 # In addition, further instructions that write to the same stack slot should
11 # be recognised as clobbering the value in that slot.
13 define i8 @test(i32 %bar) local_unnamed_addr !dbg !7 {
18 declare dso_local void @ext(i64)
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)
33 !11 = !DILocalVariable(name: "baz", scope: !7, file: !1, line: 7, type: !2)
34 !12 = !DILocation(line: 10, scope: !7)
38 tracksRegLiveness: true
41 - { reg: '$rdi', virtual-reg: '' }
42 debugValueSubstitutions:
43 - { srcinst: 2, srcop: 0, dstinst: 3, dstop: 1000000, subreg: 0 }
44 - { srcinst: 4, srcop: 0, dstinst: 5, dstop: 1000000, subreg: 0 }
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: '' }
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
\r
57 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(2, 0)
\r
58 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $rsp
\r
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
\r
62 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0)
\r
63 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $noreg
\r
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
\r
68 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(2, 0)
\r
69 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $noreg
\r
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
\r
75 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(4, 0),
\r
76 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $rsp
\r
77 ;; Overwrite the stack: LiveDebugValues should explicitly undef the stack
78 ;; location with DBG_VALUE_LIST $noreg, as DbgEntityHistoryCalculator doesn't
\r
80 INC32m $rsp, 1, $noreg, 4, $noreg, implicit-def dead $eflags, debug-location !DILocation(line: 0, scope: !7) :: (store (s32) into %stack.0)
82 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}}, $noreg
\r
84 $rax = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load 8 from %stack.0)
85 RET64 $rax, debug-location !12