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
| # RUN: llc -o - %s -start-after=patchable-function -filetype=obj -O0 -mtriple=i386-unknown-linux-gnu -dwarf-version=4 | llvm-dwarfdump -v - | FileCheck %s
# From the code:
#
# debug-loc-offset1.cc
# int bar (int b) {
# return b+4;
# }
#
# debug-loc-offset2.cc
# struct A {
# int var;
# virtual char foo();
# };
#
# void baz(struct A a) {
# int z = 2;
# if (a.var > 2)
# z++;
# if (a.foo() == 'a')
# z++;
# }
#
# Compiled separately for i386-pc-linux-gnu and linked together.
# This ensures that we have multiple compile units and multiple location lists
# so that we can verify that
# debug_loc entries are relative to the low_pc of the CU. The loc entry for
# the byval argument in foo.cpp is in the second CU and so should have
# an offset relative to that CU rather than from the beginning of the text
# section.
#
# Checking that we have two compile units with two sets of high/lo_pc.
# CHECK: .debug_info contents
# CHECK: DW_TAG_compile_unit
# CHECK: DW_AT_low_pc {{.*}} (0x0000000000000020 ".text")
# CHECK: DW_AT_high_pc
#
# CHECK: DW_TAG_subprogram
# CHECK-NOT: DW_TAG
# CHECK: DW_AT_linkage_name [DW_FORM_strp]{{.*}}"_Z3baz1A"
# CHECK-NOT: {{DW_TAG|NULL}}
# CHECK: DW_TAG_formal_parameter
# CHECK-NOT: DW_TAG
# CHECK: DW_AT_location [DW_FORM_sec_offset] ({{.*}}
# CHECK-NEXT: [0x00000029, 0x00000037): DW_OP_breg0 EAX+0, DW_OP_deref
# CHECK-NEXT: [0x00000037, 0x00000063): DW_OP_breg5 EBP-8, DW_OP_deref, DW_OP_deref
# CHECK-NEXT: DW_AT_name [DW_FORM_strp]{{.*}}"a"
#
# CHECK: DW_TAG_variable
# CHECK: DW_AT_location [DW_FORM_exprloc]
# CHECK-NOT: DW_AT_location
#
# CHECK: DW_TAG_compile_unit
# CHECK: DW_AT_low_pc {{.*}} (0x0000000000000000 ".text")
# CHECK: DW_AT_high_pc
#
# CHECK: DW_TAG_subprogram
# CHECK-NOT: DW_TAG
# CHECK: DW_AT_linkage_name [DW_FORM_strp]{{.*}}"_Z3bari"
# CHECK-NOT: {{DW_TAG|NULL}}
# CHECK: DW_TAG_formal_parameter
# CHECK-NOT: DW_TAG
# CHECK: DW_AT_location [DW_FORM_sec_offset] ({{.*}}
# CHECK-NEXT: [0x00000000, 0x0000000a): DW_OP_consts +0, DW_OP_stack_value
# CHECK-NEXT: [0x0000000a, 0x00000017): DW_OP_consts +1, DW_OP_stack_value)
# CHECK-NEXT: DW_AT_name [DW_FORM_strp]{{.*}}"b"
#
# CHECK: .debug_loc contents:
# CHECK: 0x00000000:
# CHECK-NEXT: [0x00000000, 0x0000000a): DW_OP_consts +0, DW_OP_stack_value
# CHECK-NEXT: [0x0000000a, 0x00000017): DW_OP_consts +1, DW_OP_stack_value
# CHECK: 0x00000022:
# CHECK-NEXT: [0x00000009, 0x00000017): DW_OP_breg0 EAX+0, DW_OP_deref
# CHECK-NEXT: [0x00000017, 0x00000043): DW_OP_breg5 EBP-8, DW_OP_deref, DW_OP_deref
--- |
target triple = "i386-unknown-linux-gnu"
%struct.A = type { i32 (...)**, i32 }
; Function Attrs: nounwind
define i32 @_Z3bari(i32 %b) #0 !dbg !10 {
entry:
%b.addr = alloca i32, align 4
store i32 %b, i32* %b.addr, align 4
call void @llvm.dbg.value(metadata i32 0, metadata !14, metadata !DIExpression()), !dbg !15
%0 = load i32, i32* %b.addr, align 4, !dbg !16
call void @llvm.dbg.value(metadata i32 1, metadata !14, metadata !DIExpression()), !dbg !15
%add = add nsw i32 %0, 4, !dbg !16
ret i32 %add, !dbg !16
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
define void @_Z3baz1A(%struct.A* %a) #2 !dbg !17 {
entry:
%z = alloca i32, align 4
call void @llvm.dbg.declare(metadata %struct.A* %a, metadata !20, metadata !DIExpression(DW_OP_deref)), !dbg !21
call void @llvm.dbg.declare(metadata i32* %z, metadata !22, metadata !DIExpression()), !dbg !23
store i32 2, i32* %z, align 4, !dbg !23
%var = getelementptr inbounds %struct.A, %struct.A* %a, i32 0, i32 1, !dbg !24
%0 = load i32, i32* %var, align 4, !dbg !24
%cmp = icmp sgt i32 %0, 2, !dbg !24
br i1 %cmp, label %if.then, label %if.end, !dbg !24
if.then: ; preds = %entry
%1 = load i32, i32* %z, align 4, !dbg !26
%inc = add nsw i32 %1, 1, !dbg !26
store i32 %inc, i32* %z, align 4, !dbg !26
br label %if.end, !dbg !26
if.end: ; preds = %if.then, %entry
%call = call signext i8 @_ZN1A3fooEv(%struct.A* %a), !dbg !27
%conv = sext i8 %call to i32, !dbg !27
%cmp1 = icmp eq i32 %conv, 97, !dbg !27
br i1 %cmp1, label %if.then2, label %if.end4, !dbg !27
if.then2: ; preds = %if.end
%2 = load i32, i32* %z, align 4, !dbg !29
%inc3 = add nsw i32 %2, 1, !dbg !29
store i32 %inc3, i32* %z, align 4, !dbg !29
br label %if.end4, !dbg !29
if.end4: ; preds = %if.then2, %if.end
ret void, !dbg !30
}
declare signext i8 @_ZN1A3fooEv(%struct.A*) #2
; Function Attrs: nounwind
declare void @llvm.stackprotector(i8*, i8**) #3
attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone speculatable }
attributes #2 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #3 = { nounwind }
!llvm.dbg.cu = !{!0, !3}
!llvm.module.flags = !{!7, !8}
!llvm.ident = !{!9, !9}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.5.0 (210479)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
!1 = !DIFile(filename: "debug-loc-offset1.cc", directory: "/llvm_cmake_gcc")
!2 = !{}
!3 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !4, producer: "clang version 3.5.0 (210479)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !5, globals: !2, imports: !2)
!4 = !DIFile(filename: "debug-loc-offset2.cc", directory: "/llvm_cmake_gcc")
!5 = !{!6}
!6 = !DICompositeType(tag: DW_TAG_structure_type, name: "A", file: !4, line: 1, flags: DIFlagFwdDecl, identifier: "_ZTS1A")
!7 = !{i32 2, !"Dwarf Version", i32 4}
!8 = !{i32 2, !"Debug Info Version", i32 3}
!9 = !{!"clang version 3.5.0 (210479)"}
!10 = distinct !DISubprogram(name: "bar", linkageName: "_Z3bari", scope: !1, file: !1, line: 1, type: !11, isLocal: false, isDefinition: true, scopeLine: 1, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
!11 = !DISubroutineType(types: !12)
!12 = !{!13, !13}
!13 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!14 = !DILocalVariable(name: "b", arg: 1, scope: !10, file: !1, line: 1, type: !13)
!15 = !DILocation(line: 1, scope: !10)
!16 = !DILocation(line: 2, scope: !10)
!17 = distinct !DISubprogram(name: "baz", linkageName: "_Z3baz1A", scope: !4, file: !4, line: 6, type: !18, isLocal: false, isDefinition: true, scopeLine: 6, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !3, retainedNodes: !2)
!18 = !DISubroutineType(types: !19)
!19 = !{null, !6}
!20 = !DILocalVariable(name: "a", arg: 1, scope: !17, file: !4, line: 6, type: !6)
!21 = !DILocation(line: 6, scope: !17)
!22 = !DILocalVariable(name: "z", scope: !17, file: !4, line: 7, type: !13)
!23 = !DILocation(line: 7, scope: !17)
!24 = !DILocation(line: 8, scope: !25)
!25 = distinct !DILexicalBlock(scope: !17, file: !4, line: 8)
!26 = !DILocation(line: 9, scope: !25)
!27 = !DILocation(line: 10, scope: !28)
!28 = distinct !DILexicalBlock(scope: !17, file: !4, line: 10)
!29 = !DILocation(line: 11, scope: !28)
!30 = !DILocation(line: 12, scope: !17)
...
---
name: _Z3bari
alignment: 16
tracksRegLiveness: true
frameInfo:
stackSize: 8
offsetAdjustment: -4
maxAlignment: 4
maxCallFrameSize: 0
fixedStack:
- { id: 0, type: spill-slot, offset: -8, size: 4, alignment: 8, stack-id: default }
- { id: 1, size: 4, alignment: 16, stack-id: default }
stack:
- { id: 0, type: spill-slot, offset: -12, size: 4, alignment: 4, stack-id: default }
body: |
bb.0.entry:
frame-setup PUSH32r killed $ebp, implicit-def $esp, implicit $esp
CFI_INSTRUCTION def_cfa_offset 8
CFI_INSTRUCTION offset $ebp, -8
$ebp = frame-setup MOV32rr $esp
CFI_INSTRUCTION def_cfa_register $ebp
frame-setup PUSH32r undef $eax, implicit-def $esp, implicit $esp
renamable $eax = MOV32rm $ebp, 1, $noreg, 8, $noreg :: (load 4 from %fixed-stack.1)
DBG_VALUE 0, 0, !14, !DIExpression(), debug-location !15
renamable $ecx = MOV32rm $ebp, 1, $noreg, 8, $noreg, debug-location !16 :: (load 4 from %ir.b.addr)
DBG_VALUE 1, 0, !14, !DIExpression(), debug-location !15
renamable $ecx = ADD32ri8 renamable $ecx, 4, implicit-def $eflags, debug-location !16
MOV32mr $ebp, 1, $noreg, -4, $noreg, killed $eax :: (store 4 into %fixed-stack.1)
$eax = MOV32rr killed $ecx, debug-location !16
$esp = frame-destroy ADD32ri8 $esp, 4, implicit-def dead $eflags, debug-location !16
$ebp = frame-destroy POP32r implicit-def $esp, implicit $esp, debug-location !16
CFI_INSTRUCTION def_cfa $esp, 4, debug-location !16
RETL implicit killed $eax, debug-location !16
...
---
name: _Z3baz1A
alignment: 16
tracksRegLiveness: true
frameInfo:
stackSize: 28
offsetAdjustment: -24
maxAlignment: 4
adjustsStack: true
hasCalls: true
maxCallFrameSize: 4
fixedStack:
- { id: 0, type: spill-slot, offset: -8, size: 4, alignment: 8, stack-id: default }
- { id: 1, size: 4, alignment: 16, stack-id: default, isImmutable: true }
stack:
- { id: 0, name: z, offset: -12, size: 4, alignment: 4, stack-id: default,
debug-info-variable: '!22', debug-info-expression: '!DIExpression()',
debug-info-location: '!23' }
- { id: 1, type: spill-slot, offset: -16, size: 4, alignment: 4, stack-id: default }
body: |
bb.0.entry:
frame-setup PUSH32r killed $ebp, implicit-def $esp, implicit $esp
CFI_INSTRUCTION def_cfa_offset 8
CFI_INSTRUCTION offset $ebp, -8
$ebp = frame-setup MOV32rr $esp
CFI_INSTRUCTION def_cfa_register $ebp
$esp = frame-setup SUB32ri8 $esp, 24, implicit-def dead $eflags
renamable $eax = MOV32rm $ebp, 1, $noreg, 8, $noreg :: (load 4 from %fixed-stack.1)
DBG_VALUE renamable $eax, 0, !20, !DIExpression(DW_OP_deref), debug-location !21
MOV32mi $ebp, 1, $noreg, -4, $noreg, 2, debug-location !23 :: (store 4 into %ir.z)
CMP32mi8 renamable $eax, 1, $noreg, 4, $noreg, 2, implicit-def $eflags, debug-location !24 :: (load 4 from %ir.var)
MOV32mr $ebp, 1, $noreg, -8, $noreg, killed $eax :: (store 4 into %stack.1)
DBG_VALUE $ebp, 0, !20, !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_deref), debug-location !21
JCC_1 %bb.2, 14, implicit $eflags, debug-location !24
bb.1.if.then:
DBG_VALUE $ebp, 0, !20, !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_deref), debug-location !21
renamable $eax = MOV32rm $ebp, 1, $noreg, -4, $noreg, debug-location !26 :: (load 4 from %ir.z)
renamable $eax = ADD32ri8 renamable $eax, 1, implicit-def $eflags, debug-location !26
MOV32mr $ebp, 1, $noreg, -4, $noreg, killed renamable $eax, debug-location !26 :: (store 4 into %ir.z)
bb.2.if.end:
DBG_VALUE $ebp, 0, !20, !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_deref), debug-location !21
$eax = MOV32rm $ebp, 1, $noreg, -8, $noreg :: (load 4 from %stack.1)
MOV32mr $esp, 1, $noreg, 0, $noreg, killed renamable $eax, debug-location !27 :: (store 4 into stack)
CALLpcrel32 @_ZN1A3fooEv, csr_32, implicit $esp, implicit $ssp, implicit-def $al, debug-location !27
renamable $ecx = MOVSX32rr8 killed renamable $al, debug-location !27
CMP32ri8 killed renamable $ecx, 97, implicit-def $eflags, debug-location !27
JCC_1 %bb.4, 5, implicit $eflags, debug-location !27
bb.3.if.then2:
DBG_VALUE $ebp, 0, !20, !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_deref), debug-location !21
renamable $eax = MOV32rm $ebp, 1, $noreg, -4, $noreg, debug-location !29 :: (load 4 from %ir.z)
renamable $eax = ADD32ri8 renamable $eax, 1, implicit-def $eflags, debug-location !29
MOV32mr $ebp, 1, $noreg, -4, $noreg, killed renamable $eax, debug-location !29 :: (store 4 into %ir.z)
bb.4.if.end4:
DBG_VALUE $ebp, 0, !20, !DIExpression(DW_OP_constu, 8, DW_OP_minus, DW_OP_deref, DW_OP_deref), debug-location !21
$esp = frame-destroy ADD32ri8 $esp, 24, implicit-def dead $eflags, debug-location !30
$ebp = frame-destroy POP32r implicit-def $esp, implicit $esp, debug-location !30
CFI_INSTRUCTION def_cfa $esp, 4, debug-location !30
RETL debug-location !30
...
|