xref: /llvm-project/llvm/test/DebugInfo/MIR/X86/live-debug-values-stack-clobber.mir (revision c81a121f3f230cfe468b6def6d2904b4aefb855b)
1# RUN: llc -mtriple=x86_64-unknown-unknown %s -o - -run-pass=livedebugvalues | FileCheck %s
2#
3# Fix some of PR42772. Consider the code below: the arguments are forced onto
4# the stack by the FORCE_SPILL macro, and go out of liveness if the
5# "bees == 2" conditional is not taken. A spill slot is then re-used to
6# preserve quux over the second FORCE_SPILL, over-writing the value of either
7# "a" or "b". LiveDebugValues should detect when this happens, and terminate
8# stack-spill locations when they get overwritten by a new value.
9#
10# --------8<--------
11# #define FORCE_SPILL() \
12#   __asm volatile("" : : : \
13#                    "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "rbp", "r8", \
14#                    "r9", "r10", "r11", "r12", "r13", "r14", "r15")
15#
16# volatile int bees = 0;
17#
18# long int f(long int a, long int b) {
19#   if (bees == 12)
20#    return 3;
21#
22#   FORCE_SPILL();
23#   if (bees == 2)
24#     return a - b;
25#
26#   int quux = sum(1, 2);
27#   FORCE_SPILL();
28#   bees++;
29#   return quux;
30# }
31# -------->8--------
32#
33# CHECK:       ![[ANUM:[0-9]+]] = !DILocalVariable(name: "a"
34# CHECK:       ![[BNUM:[0-9]+]] = !DILocalVariable(name: "b"
35# CHECK:       ![[CNUM:[0-9]+]] = !DILocalVariable(name: "c"
36#
37# These variables should be spilt,
38# CHECK-LABEL: bb.1.if.end:
39# CHECK:       MOV64mr $rsp, 1, $noreg, 16, $noreg, killed renamable $rsi
40# CHECK-NEXT:  DBG_VALUE_LIST ![[CNUM]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_plus_uconst, 16, DW_OP_deref
41# CHECK-SAME:  $rsp, $rdi
42# CHECK-NEXT:  DBG_VALUE $rsp, 0, ![[BNUM]], !DIExpression(
43# CHECK-NEXT:  MOV64mr $rsp, 1, $noreg, 8, $noreg, killed renamable $rdi
44# CHECK-NEXT:  DBG_VALUE_LIST ![[CNUM]], !DIExpression({{[^)]+}}DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 8, DW_OP_deref
45# CHECK-SAME:  $rsp, $rsp
46# CHECK-NEXT:  DBG_VALUE $rsp, 0, ![[ANUM]], !DIExpression(
47# CHECK-NEXT:  INLINEASM
48#
49# Then the location of "a" should be terminated when overwritten
50# CHECK-LABEL: bb.3.if.end3:
51# CHECK:       CALL64pcrel32 @sum
52# CHECK-NEXT:  MOV64mr $rsp, 1, $noreg, 8, $noreg, $rax
53# CHECK-NEXT:  DBG_VALUE_LIST ![[CNUM]], !DIExpression({{[^)]*}}), $noreg, $noreg
54# CHECK-NEXT:  DBG_VALUE $noreg, $noreg, ![[ANUM]], !DIExpression()
55# CHECK-NEXT:  INLINEASM
56
57--- |
58  target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
59  target triple = "x86_64-unknown-linux-gnu"
60
61  @bees = external global i32, !dbg !0
62
63  ; Function Attrs: noinline norecurse nounwind readnone uwtable
64  declare i64 @sum(i64, i64)
65
66  ; Function Attrs: noinline nounwind uwtable
67  define i64 @f(i64 %a, i64 %b) !dbg !12 {
68  entry:
69    br label %if.end
70  if.end:
71    br label %if.then2
72  if.then2:
73    br label %if.end3
74  if.end3:
75    br label %return
76  return:
77    ret i64 0
78  }
79
80  !llvm.dbg.cu = !{!2}
81  !llvm.module.flags = !{!8, !9, !10}
82
83  !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
84  !1 = distinct !DIGlobalVariable(name: "bees", scope: !2, file: !3, line: 6, type: !6, isLocal: false, isDefinition: true)
85  !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
86  !3 = !DIFile(filename: "pr42772.c", directory: ".")
87  !4 = !{}
88  !5 = !{!0}
89  !6 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !7)
90  !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
91  !8 = !{i32 2, !"Dwarf Version", i32 4}
92  !9 = !{i32 2, !"Debug Info Version", i32 3}
93  !10 = !{i32 1, !"wchar_size", i32 4}
94  !12 = distinct !DISubprogram(name: "f", scope: !3, file: !3, line: 15, type: !13, scopeLine: 15, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !16)
95  !13 = !DISubroutineType(types: !14)
96  !14 = !{!15, !15, !15}
97  !15 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
98  !16 = !{!17, !18, !19}
99  !17 = !DILocalVariable(name: "a", arg: 1, scope: !12, file: !3, line: 15, type: !15)
100  !18 = !DILocalVariable(name: "b", arg: 2, scope: !12, file: !3, line: 15, type: !15)
101  !19 = !DILocalVariable(name: "c", scope: !12, file: !3, line: 23, type: !7)
102  !28 = !DILocation(line: 1, column: 1, scope: !12)
103
104...
105---
106name:            f
107tracksRegLiveness: true
108debugInstrRef: true
109liveins:
110  - { reg: '$rdi', virtual-reg: '' }
111  - { reg: '$rsi', virtual-reg: '' }
112frameInfo:
113  stackSize:       72
114  offsetAdjustment: -72
115  maxAlignment:    8
116  adjustsStack:    true
117  hasCalls:        true
118  cvBytesOfCalleeSavedRegisters: 48
119fixedStack:
120  - { id: 0, type: spill-slot, offset: -56, size: 8, alignment: 8, stack-id: default,
121      callee-saved-register: '$rbx', callee-saved-restored: true, debug-info-variable: '',
122      debug-info-expression: '', debug-info-location: '' }
123  - { id: 1, type: spill-slot, offset: -48, size: 8, alignment: 16, stack-id: default,
124      callee-saved-register: '$r12', callee-saved-restored: true, debug-info-variable: '',
125      debug-info-expression: '', debug-info-location: '' }
126  - { id: 2, type: spill-slot, offset: -40, size: 8, alignment: 8, stack-id: default,
127      callee-saved-register: '$r13', callee-saved-restored: true, debug-info-variable: '',
128      debug-info-expression: '', debug-info-location: '' }
129  - { id: 3, type: spill-slot, offset: -32, size: 8, alignment: 16, stack-id: default,
130      callee-saved-register: '$r14', callee-saved-restored: true, debug-info-variable: '',
131      debug-info-expression: '', debug-info-location: '' }
132  - { id: 4, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default,
133      callee-saved-register: '$r15', callee-saved-restored: true, debug-info-variable: '',
134      debug-info-expression: '', debug-info-location: '' }
135  - { id: 5, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
136      callee-saved-register: '$rbp', callee-saved-restored: true, debug-info-variable: '',
137      debug-info-expression: '', debug-info-location: '' }
138stack:
139  - { id: 0, name: '', type: spill-slot, offset: -72, size: 8, alignment: 8,
140      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
141      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
142  - { id: 1, name: '', type: spill-slot, offset: -64, size: 8, alignment: 8,
143      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
144      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
145body:             |
146  bb.0.entry:
147    successors: %bb.4, %bb.1
148    liveins: $rdi, $rsi, $rbp, $r15, $r14, $r13, $r12, $rbx
149
150    DBG_VALUE $rdi, $noreg, !17, !DIExpression(), debug-location !28
151    DBG_VALUE $rdi, $noreg, !17, !DIExpression(), debug-location !28
152    DBG_VALUE $rsi, $noreg, !18, !DIExpression(), debug-location !28
153    DBG_VALUE $rsi, $noreg, !18, !DIExpression(), debug-location !28
154    DBG_VALUE_LIST !19, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_plus), $rsi, $rdi, debug-location !28
155    frame-setup PUSH64r killed $rbp, implicit-def $rsp, implicit $rsp, debug-location !28
156    frame-setup PUSH64r killed $r15, implicit-def $rsp, implicit $rsp, debug-location !28
157    frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp, debug-location !28
158    frame-setup PUSH64r killed $r13, implicit-def $rsp, implicit $rsp, debug-location !28
159    frame-setup PUSH64r killed $r12, implicit-def $rsp, implicit $rsp, debug-location !28
160    frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp, debug-location !28
161    $rsp = frame-setup SUB64ri8 $rsp, 24, implicit-def dead $eflags
162    renamable $ecx = MOV32rm $rip, 1, $noreg, @bees, $noreg, debug-location !28 :: (volatile dereferenceable load (s32) from @bees)
163    $eax = MOV32ri 3, implicit-def $rax
164    CMP32ri killed renamable $ecx, 12, implicit-def $eflags, debug-location !28
165    JCC_1 %bb.4, 4, implicit $eflags, debug-location !28
166
167  bb.1.if.end:
168    successors: %bb.2, %bb.3
169    liveins: $rdi, $rsi
170
171    MOV64mr $rsp, 1, $noreg, 16, $noreg, killed renamable $rsi :: (store (s64) into %stack.1)
172    MOV64mr $rsp, 1, $noreg, 8, $noreg, killed renamable $rdi :: (store (s64) into %stack.0)
173    INLINEASM &"", 1, 12, implicit-def dead early-clobber $rax, 12, implicit-def dead early-clobber $rbx, 12, implicit-def dead early-clobber $rcx, 12, implicit-def dead early-clobber $rdx, 12, implicit-def dead early-clobber $rsi, 12, implicit-def dead early-clobber $rdi, 12, implicit-def dead early-clobber $rbp, 12, implicit-def dead early-clobber $r8, 12, implicit-def dead early-clobber $r9, 12, implicit-def dead early-clobber $r10, 12, implicit-def dead early-clobber $r11, 12, implicit-def dead early-clobber $r12, 12, implicit-def dead early-clobber $r13, 12, implicit-def dead early-clobber $r14, 12, implicit-def dead early-clobber $r15, 12, implicit-def dead early-clobber $df, 12, implicit-def dead early-clobber $fpsw, 12, implicit-def dead early-clobber $eflags, debug-location !28
174    renamable $eax = MOV32rm $rip, 1, $noreg, @bees, $noreg, debug-location !28 :: (volatile dereferenceable load (s32) from @bees)
175    CMP32ri killed renamable $eax, 2, implicit-def $eflags, debug-location !28
176    JCC_1 %bb.3, 5, implicit killed $eflags, debug-location !28
177
178  bb.2.if.then2:
179    successors: %bb.4
180
181    renamable $rax = MOV64rm $rsp, 1, $noreg, 8, $noreg :: (load (s64) from %stack.0)
182    renamable $rax = SUB64rm killed renamable $rax, $rsp, 1, $noreg, 16, $noreg, implicit-def dead $eflags, debug-location !28 :: (load (s64) from %stack.1)
183    JMP_1 %bb.4
184
185  bb.3.if.end3:
186    successors: %bb.4
187
188    $edi = MOV32ri 1, implicit-def $rdi, debug-location !28
189    $esi = MOV32ri 2, implicit-def $rsi, debug-location !28
190    CALL64pcrel32 @sum, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit $rsi, implicit-def $rsp, implicit-def $ssp, implicit-def $rax, debug-location !28
191    MOV64mr $rsp, 1, $noreg, 8, $noreg, $rax :: (store (s64) into %stack.0)
192    INLINEASM &"", 1, 12, implicit-def dead early-clobber $rax, 12, implicit-def dead early-clobber $rbx, 12, implicit-def dead early-clobber $rcx, 12, implicit-def dead early-clobber $rdx, 12, implicit-def dead early-clobber $rsi, 12, implicit-def dead early-clobber $rdi, 12, implicit-def dead early-clobber $rbp, 12, implicit-def dead early-clobber $r8, 12, implicit-def dead early-clobber $r9, 12, implicit-def dead early-clobber $r10, 12, implicit-def dead early-clobber $r11, 12, implicit-def dead early-clobber $r12, 12, implicit-def dead early-clobber $r13, 12, implicit-def dead early-clobber $r14, 12, implicit-def dead early-clobber $r15, 12, implicit-def dead early-clobber $df, 12, implicit-def dead early-clobber $fpsw, 12, implicit-def dead early-clobber $eflags, debug-location !28
193    ADD32mi $rip, 1, $noreg, @bees, $noreg, 1, implicit-def dead $eflags, debug-location !28 :: (volatile store (s32) into @bees), (volatile dereferenceable load (s32) from @bees)
194    renamable $rax = MOVSX64rm32 $rsp, 1, $noreg, 8, $noreg, debug-location !28 :: (load (s32) from %stack.0, align 8)
195
196  bb.4.return:
197    liveins: $rax
198
199    $rsp = frame-destroy ADD64ri8 $rsp, 24, implicit-def dead $eflags, debug-location !28
200    $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28
201    $r12 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28
202    $r13 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28
203    $r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28
204    $r15 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28
205    $rbp = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !28
206    RET64 $rax, debug-location !28
207
208...
209