1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
|
# RUN: llc %s -o - -experimental-debug-variable-locations=true \
# RUN: -run-pass=livedebugvalues | \
# RUN: FileCheck %s --implicit-check-not=DBG_VALUE
#
## Check that LiveDebugValues can track and join DBG_INSTR_REFs that use
## registers, stack slots, and constants in a single instruction.
#
# CHECK: ![[VAR_D:[0-9]+]] = !DILocalVariable(name: "d"
# CHECK-LABEL: bb.0.entry
#
## Value at end of first block should use the registers given by DBG_PHI, and
## fold the offset+deref from stack slot [$rsp+12] into the expression.
# CHECK: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $ebp, $rsp, $ebx, 6
# CHECK-LABEL: bb.1.while.body
#
## Prior DBG_VALUE_LIST should be live-in to this bb.1.
# CHECK: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $ebp, $rsp, $ebx, 6
#
## When $ebp is spilled to a stack slot, a new debug value using the stack slot
## should be inserted.
# CHECK: MOV32mr $rsp, {{.+}} $ebp
# CHECK-NEXT: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_plus_uconst, 16, DW_OP_deref, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $rsp, $rsp, $ebx, 6
#
## Similarly produce a new debug value when $ebx is spilled.
# CHECK: MOV32mr $rsp, {{.+}} $ebx
# CHECK-NEXT: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_plus_uconst, 16, DW_OP_deref, DW_OP_LLVM_arg, 2, DW_OP_plus_uconst, 20, DW_OP_deref, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $rsp, $rsp, $rsp, 6
#
## When the value in the stack slot is restored and then that slot is clobbered, the debug value should use the restored register.
# CHECK: MOV32mi $rsp
# CHECK-NEXT: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_plus_uconst, 16, DW_OP_deref, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $rsp, $rsp, $ebx, 6
#
## Repeat for the next stack slot that gets restored and then clobbered.
# CHECK: MOV32mi $rsp
# CHECK-NEXT: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $ebp, $rsp, $ebx, 6
#
## TODO: The debug value range should be terminated when the value in $ebx is clobbered.
#
## At the end of the block a new DBG_INSTR_REF begins a new range.
# CHECK: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $ebp, $rsp, $ebx, 6
# CHECK-LABEL: bb.2.while.end
#
## Finally, the two entry debug values should be joined, as they have identical
## expressions, their respective stack slots and constants are identical, and
## the remaining operands occupy the same registers out of each block.
# CHECK: DBG_VALUE_LIST ![[VAR_D]]
# CHECK-SAME: !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus_uconst, 12, DW_OP_deref, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value)
# CHECK-SAME: $ebp, $rsp, $ebx, 6
--- |
; ModuleID = 'test.ll'
source_filename = "test.cpp"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z3fooii(i32 noundef %a, i32 noundef %b) local_unnamed_addr !dbg !9 {
entry:
%call = tail call noundef i32 @_Z3bazv(), !dbg !18
call void @llvm.dbg.value(metadata !DIArgList(i32 %a, i32 %call, i32 %b), metadata !17, metadata !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus, DW_OP_constu, 6, DW_OP_minus, DW_OP_stack_value)), !dbg !19
%cmp19 = icmp sgt i32 %b, %a, !dbg !20
br i1 %cmp19, label %while.body.preheader, label %while.end, !dbg !21
while.body.preheader: ; preds = %entry
br label %while.body, !dbg !21
while.body: ; preds = %while.body.preheader, %while.body
%a.addr.021 = phi i32 [ %mul3, %while.body ], [ %a, %while.body.preheader ]
%b.addr.020 = phi i32 [ %add2, %while.body ], [ %b, %while.body.preheader ]
%call1 = tail call noundef i32 @_Z3bazv(), !dbg !22
tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() #3, !dbg !24, !srcloc !25
%add2 = add i32 %b.addr.020, 2, !dbg !26
%mul3 = shl nsw i32 %a.addr.021, 1, !dbg !27
call void @llvm.dbg.value(metadata !DIArgList(i32 %mul3, i32 %call, i32 %add2), metadata !17, metadata !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus, DW_OP_constu, 6, DW_OP_minus, DW_OP_stack_value)), !dbg !19
%cmp = icmp sgt i32 %add2, %mul3, !dbg !20
br i1 %cmp, label %while.body, label %while.end, !dbg !21, !llvm.loop !28
while.end: ; preds = %while.body, %entry
%b.addr.0.lcssa = phi i32 [ %b, %entry ], [ %add2, %while.body ]
%a.addr.0.lcssa = phi i32 [ %a, %entry ], [ %mul3, %while.body ]
%add7 = sub i32 %b.addr.0.lcssa, %call, !dbg !31
%sub8 = add i32 %add7, %a.addr.0.lcssa, !dbg !32
ret i32 %sub8, !dbg !33
}
declare !dbg !34 noundef i32 @_Z3bazv() local_unnamed_addr
; Function Attrs: nocallback nofree nosync nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!2, !3, !4, !5, !6, !7}
!llvm.ident = !{!8}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus_14, file: !1, producer: "clang version 16.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
!1 = !DIFile(filename: "test.cpp", directory: "/")
!2 = !{i32 7, !"Dwarf Version", i32 5}
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = !{i32 1, !"wchar_size", i32 4}
!5 = !{i32 8, !"PIC Level", i32 2}
!6 = !{i32 7, !"PIE Level", i32 2}
!7 = !{i32 7, !"uwtable", i32 2}
!8 = !{!"clang version 16.0.0"}
!9 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooii", scope: !1, file: !1, line: 3, type: !10, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !13)
!10 = !DISubroutineType(types: !11)
!11 = !{!12, !12, !12}
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!13 = !{!14, !15, !16, !17}
!14 = !DILocalVariable(name: "a", arg: 1, scope: !9, file: !1, line: 3, type: !12)
!15 = !DILocalVariable(name: "b", arg: 2, scope: !9, file: !1, line: 3, type: !12)
!16 = !DILocalVariable(name: "c", scope: !9, file: !1, line: 4, type: !12)
!17 = !DILocalVariable(name: "d", scope: !9, file: !1, line: 5, type: !12)
!18 = !DILocation(line: 4, column: 11, scope: !9)
!19 = !DILocation(line: 0, scope: !9)
!20 = !DILocation(line: 6, column: 12, scope: !9)
!21 = !DILocation(line: 6, column: 3, scope: !9)
!22 = !DILocation(line: 7, column: 5, scope: !23)
!23 = distinct !DILexicalBlock(scope: !9, file: !1, line: 6, column: 17)
!24 = !DILocation(line: 9, column: 5, scope: !23)
!25 = !{i64 129}
!26 = !DILocation(line: 8, column: 7, scope: !23)
!27 = !DILocation(line: 10, column: 7, scope: !23)
!28 = distinct !{!28, !21, !29, !30}
!29 = !DILocation(line: 12, column: 3, scope: !9)
!30 = !{!"llvm.loop.mustprogress"}
!31 = !DILocation(line: 13, column: 12, scope: !9)
!32 = !DILocation(line: 13, column: 16, scope: !9)
!33 = !DILocation(line: 13, column: 3, scope: !9)
!34 = !DISubprogram(name: "baz", linkageName: "_Z3bazv", scope: !1, file: !1, line: 1, type: !35, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !37)
!35 = !DISubroutineType(types: !36)
!36 = !{!12}
!37 = !{}
...
---
name: _Z3fooii
alignment: 16
tracksRegLiveness: true
tracksDebugUserValues: true
debugInstrRef: true
registers: []
liveins:
- { reg: '$edi', virtual-reg: '' }
- { reg: '$esi', virtual-reg: '' }
frameInfo:
stackSize: 72
offsetAdjustment: -72
maxAlignment: 4
adjustsStack: true
hasCalls: true
stackProtector: ''
functionContext: ''
cvBytesOfCalleeSavedRegisters: 48
savePoint: ''
restorePoint: ''
fixedStack:
- { id: 0, type: spill-slot, offset: -56, size: 8, alignment: 8, stack-id: default,
callee-saved-register: '$rbx', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
- { id: 1, type: spill-slot, offset: -48, size: 8, alignment: 16, stack-id: default,
callee-saved-register: '$r12', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
- { id: 2, type: spill-slot, offset: -40, size: 8, alignment: 8, stack-id: default,
callee-saved-register: '$r13', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
- { id: 3, type: spill-slot, offset: -32, size: 8, alignment: 16, stack-id: default,
callee-saved-register: '$r14', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
- { id: 4, type: spill-slot, offset: -24, size: 8, alignment: 8, stack-id: default,
callee-saved-register: '$r15', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
- { id: 5, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: default,
callee-saved-register: '$rbp', callee-saved-restored: true, debug-info-variable: '',
debug-info-expression: '', debug-info-location: '' }
stack:
- { id: 0, name: '', type: spill-slot, offset: -60, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 1, name: '', type: spill-slot, offset: -64, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 2, name: '', type: spill-slot, offset: -68, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
callSites: []
debugValueSubstitutions: []
constants: []
machineFunctionInfo: {}
body: |
bb.0.entry:
successors: %bb.1(0x78e38e39), %bb.3(0x071c71c7)
liveins: $edi, $esi, $rbp, $r15, $r14, $r13, $r12, $rbx
frame-setup PUSH64r killed $rbp, implicit-def $rsp, implicit $rsp
frame-setup CFI_INSTRUCTION def_cfa_offset 16
frame-setup PUSH64r killed $r15, implicit-def $rsp, implicit $rsp
frame-setup CFI_INSTRUCTION def_cfa_offset 24
frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp
frame-setup CFI_INSTRUCTION def_cfa_offset 32
frame-setup PUSH64r killed $r13, implicit-def $rsp, implicit $rsp
frame-setup CFI_INSTRUCTION def_cfa_offset 40
frame-setup PUSH64r killed $r12, implicit-def $rsp, implicit $rsp
frame-setup CFI_INSTRUCTION def_cfa_offset 48
frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp
frame-setup CFI_INSTRUCTION def_cfa_offset 56
$rsp = frame-setup SUB64ri8 $rsp, 24, implicit-def dead $eflags
frame-setup CFI_INSTRUCTION def_cfa_offset 80
CFI_INSTRUCTION offset $rbx, -56
CFI_INSTRUCTION offset $r12, -48
CFI_INSTRUCTION offset $r13, -40
CFI_INSTRUCTION offset $r14, -32
CFI_INSTRUCTION offset $r15, -24
CFI_INSTRUCTION offset $rbp, -16
DBG_PHI $esi, 5
DBG_PHI $edi, 3
$ebx = MOV32rr $esi
$ebp = MOV32rr $edi
CALL64pcrel32 target-flags(x86-plt) @_Z3bazv, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-instr-number 4, debug-location !18
MOV32mr $rsp, 1, $noreg, 12, $noreg, $eax :: (store (s32) into %stack.2)
DBG_INSTR_REF !17, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value), dbg-instr-ref(3, 0), dbg-instr-ref(4, 6), dbg-instr-ref(5, 0), 6, debug-location !19
CMP32rr renamable $ebx, renamable $ebp, implicit-def $eflags, debug-location !20
JCC_1 %bb.3, 14, implicit $eflags, debug-location !21
bb.1.while.body (align 16):
successors: %bb.1(0x78e38e39), %bb.3(0x071c71c7)
liveins: $ebp, $ebx
MOV32mr $rsp, 1, $noreg, 16, $noreg, killed renamable $ebp :: (store (s32) into %stack.1)
MOV32mr $rsp, 1, $noreg, 20, $noreg, killed renamable $ebx :: (store (s32) into %stack.0)
CALL64pcrel32 target-flags(x86-plt) @_Z3bazv, csr_64, implicit $rsp, implicit $ssp, implicit-def $rsp, implicit-def $ssp, implicit-def dead $eax, debug-location !22
INLINEASM &"", 1 /* sideeffect attdialect */, 12 /* clobber */, implicit-def dead early-clobber $rax, 12 /* clobber */, implicit-def dead early-clobber $rbx, 12 /* clobber */, implicit-def dead early-clobber $rcx, 12 /* clobber */, implicit-def dead early-clobber $rdx, 12 /* clobber */, implicit-def dead early-clobber $rsi, 12 /* clobber */, implicit-def dead early-clobber $rdi, 12 /* clobber */, implicit-def dead early-clobber $rbp, 12 /* clobber */, implicit-def dead early-clobber $r8, 12 /* clobber */, implicit-def dead early-clobber $r9, 12 /* clobber */, implicit-def dead early-clobber $r10, 12 /* clobber */, implicit-def dead early-clobber $r11, 12 /* clobber */, implicit-def dead early-clobber $r12, 12 /* clobber */, implicit-def dead early-clobber $r13, 12 /* clobber */, implicit-def dead early-clobber $r14, 12 /* clobber */, implicit-def dead early-clobber $r15, 12 /* clobber */, implicit-def dead early-clobber $df, 12 /* clobber */, implicit-def early-clobber $fpsw, 12 /* clobber */, implicit-def dead early-clobber $eflags, !25, debug-location !24
renamable $ebp = MOV32rm $rsp, 1, $noreg, 16, $noreg :: (load (s32) from %stack.1)
renamable $ebx = MOV32rm $rsp, 1, $noreg, 20, $noreg :: (load (s32) from %stack.0)
MOV32mi $rsp, 1, $noreg, 20, $noreg, 0 :: (store (s32) into %stack.0)
MOV32mi $rsp, 1, $noreg, 16, $noreg, 0 :: (store (s32) into %stack.1)
renamable $ebx = ADD32ri8 killed renamable $ebx, 2, implicit-def dead $eflags, debug-instr-number 2, debug-location !26
renamable $ebp = nsw ADD32rr killed renamable $ebp, renamable $ebp, implicit-def dead $eflags, debug-instr-number 1, debug-location !27
DBG_INSTR_REF !17, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 2, DW_OP_mul, DW_OP_LLVM_arg, 1, DW_OP_plus, DW_OP_LLVM_arg, 3, DW_OP_minus, DW_OP_stack_value), dbg-instr-ref(1, 0), dbg-instr-ref(4, 6), dbg-instr-ref(2, 0), 6, debug-location !19
CMP32rr renamable $ebx, renamable $ebp, implicit-def $eflags, debug-location !20
JCC_1 %bb.1, 15, implicit $eflags, debug-location !21
bb.3.while.end:
liveins: $ebp, $ebx
renamable $ebx = SUB32rm killed renamable $ebx, $rsp, 1, $noreg, 12, $noreg, implicit-def dead $eflags, debug-location !31 :: (load (s32) from %stack.2)
renamable $ebx = ADD32rr killed renamable $ebx, killed renamable $ebp, implicit-def dead $eflags, debug-location !32
$eax = MOV32rr killed $ebx, debug-location !33
$rsp = frame-destroy ADD64ri8 $rsp, 24, implicit-def dead $eflags, debug-location !33
frame-destroy CFI_INSTRUCTION def_cfa_offset 56, debug-location !33
$rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !33
frame-destroy CFI_INSTRUCTION def_cfa_offset 48, debug-location !33
$r12 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !33
frame-destroy CFI_INSTRUCTION def_cfa_offset 40, debug-location !33
$r13 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !33
frame-destroy CFI_INSTRUCTION def_cfa_offset 32, debug-location !33
$r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !33
frame-destroy CFI_INSTRUCTION def_cfa_offset 24, debug-location !33
$r15 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !33
frame-destroy CFI_INSTRUCTION def_cfa_offset 16, debug-location !33
$rbp = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !33
frame-destroy CFI_INSTRUCTION def_cfa_offset 8, debug-location !33
RET64 $eax, debug-location !33
...
|
