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
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
|
/* This testcase is part of GDB, the GNU debugger.
Copyright 2013-2018 Free Software Foundation, Inc.
Contributed by Intel Corp. <markus.t.metzger@intel.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
This file has been generated using:
gcc -S -O2 -dA -g tailcall.c -o i686-tailcall.S */
.file "tailcall.c"
.text
.Ltext0:
.p2align 4,,15
.type bar, @function
bar:
.LFB0:
.file 1 "tailcall.c"
# tailcall.c:22
.loc 1 22 0
.cfi_startproc
# BLOCK 2 freq:10000 seq:0
# PRED: ENTRY [100.0%] (FALLTHRU)
# tailcall.c:24
.loc 1 24 0
movl $42, %eax
# SUCC: EXIT [100.0%]
ret
.cfi_endproc
.LFE0:
.size bar, .-bar
.p2align 4,,15
.type foo, @function
foo:
.LFB1:
# tailcall.c:28
.loc 1 28 0
.cfi_startproc
# BLOCK 2 freq:10000 seq:0
# PRED: ENTRY [100.0%] (FALLTHRU)
# tailcall.c:29
.loc 1 29 0
jmp bar
# SUCC: EXIT [100.0%] (ABNORMAL,SIBCALL)
.LVL0:
.cfi_endproc
.LFE1:
.size foo, .-foo
.section .text.startup,"ax",@progbits
.p2align 4,,15
.globl main
.type main, @function
main:
.LFB2:
# tailcall.c:34
.loc 1 34 0
.cfi_startproc
# BLOCK 2 freq:10000 seq:0
# PRED: ENTRY [100.0%] (FALLTHRU)
# tailcall.c:37
.loc 1 37 0
call foo
.LVL1:
# tailcall.c:38
.loc 1 38 0
addl $1, %eax
.LVL2:
# SUCC: EXIT [100.0%]
# tailcall.c:41
.loc 1 41 0
ret
.cfi_endproc
.LFE2:
.size main, .-main
.text
.Letext0:
.section .debug_info,"",@progbits
.Ldebug_info0:
.long 0x8f # Length of Compilation Unit Info
.value 0x4 # DWARF version number
.long .Ldebug_abbrev0 # Offset Into Abbrev. Section
.byte 0x4 # Pointer Size (in bytes)
.uleb128 0x1 # (DIE (0xb) DW_TAG_compile_unit)
.long .LASF0 # DW_AT_producer: "GNU C 4.8.3 20140911 (Red Hat 4.8.3-7) -mtune=generic -march=i686 -g -O2"
.byte 0x1 # DW_AT_language
.long .LASF1 # DW_AT_name: "tailcall.c"
.long .LASF2 # DW_AT_comp_dir: ""
.long .Ldebug_ranges0+0 # DW_AT_ranges
.long 0 # DW_AT_low_pc
.long .Ldebug_line0 # DW_AT_stmt_list
.uleb128 0x2 # (DIE (0x25) DW_TAG_subprogram)
.ascii "bar\0" # DW_AT_name
.byte 0x1 # DW_AT_decl_file (tailcall.c)
.byte 0x15 # DW_AT_decl_line
# DW_AT_prototyped
.long 0x3a # DW_AT_type
.long .LFB0 # DW_AT_low_pc
.long .LFE0-.LFB0 # DW_AT_high_pc
.uleb128 0x1 # DW_AT_frame_base
.byte 0x9c # DW_OP_call_frame_cfa
# DW_AT_GNU_all_call_sites
.uleb128 0x3 # (DIE (0x3a) DW_TAG_base_type)
.byte 0x4 # DW_AT_byte_size
.byte 0x5 # DW_AT_encoding
.ascii "int\0" # DW_AT_name
.uleb128 0x4 # (DIE (0x41) DW_TAG_subprogram)
.ascii "foo\0" # DW_AT_name
.byte 0x1 # DW_AT_decl_file (tailcall.c)
.byte 0x1b # DW_AT_decl_line
# DW_AT_prototyped
.long 0x3a # DW_AT_type
.long .LFB1 # DW_AT_low_pc
.long .LFE1-.LFB1 # DW_AT_high_pc
.uleb128 0x1 # DW_AT_frame_base
.byte 0x9c # DW_OP_call_frame_cfa
# DW_AT_GNU_all_call_sites
.long 0x64 # DW_AT_sibling
.uleb128 0x5 # (DIE (0x5a) DW_TAG_GNU_call_site)
.long .LVL0 # DW_AT_low_pc
# DW_AT_GNU_tail_call
.long 0x25 # DW_AT_abstract_origin
.byte 0 # end of children of DIE 0x41
.uleb128 0x6 # (DIE (0x64) DW_TAG_subprogram)
# DW_AT_external
.long .LASF3 # DW_AT_name: "main"
.byte 0x1 # DW_AT_decl_file (tailcall.c)
.byte 0x21 # DW_AT_decl_line
# DW_AT_prototyped
.long 0x3a # DW_AT_type
.long .LFB2 # DW_AT_low_pc
.long .LFE2-.LFB2 # DW_AT_high_pc
.uleb128 0x1 # DW_AT_frame_base
.byte 0x9c # DW_OP_call_frame_cfa
# DW_AT_GNU_all_call_sites
.uleb128 0x7 # (DIE (0x79) DW_TAG_variable)
.long .LASF4 # DW_AT_name: "answer"
.byte 0x1 # DW_AT_decl_file (tailcall.c)
.byte 0x23 # DW_AT_decl_line
.long 0x3a # DW_AT_type
.long .LLST0 # DW_AT_location
.uleb128 0x8 # (DIE (0x88) DW_TAG_GNU_call_site)
.long .LVL1 # DW_AT_low_pc
.long 0x41 # DW_AT_abstract_origin
.byte 0 # end of children of DIE 0x64
.byte 0 # end of children of DIE 0xb
.section .debug_abbrev,"",@progbits
.Ldebug_abbrev0:
.uleb128 0x1 # (abbrev code)
.uleb128 0x11 # (TAG: DW_TAG_compile_unit)
.byte 0x1 # DW_children_yes
.uleb128 0x25 # (DW_AT_producer)
.uleb128 0xe # (DW_FORM_strp)
.uleb128 0x13 # (DW_AT_language)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3 # (DW_AT_name)
.uleb128 0xe # (DW_FORM_strp)
.uleb128 0x1b # (DW_AT_comp_dir)
.uleb128 0xe # (DW_FORM_strp)
.uleb128 0x55 # (DW_AT_ranges)
.uleb128 0x17 # (DW_FORM_sec_offset)
.uleb128 0x11 # (DW_AT_low_pc)
.uleb128 0x1 # (DW_FORM_addr)
.uleb128 0x10 # (DW_AT_stmt_list)
.uleb128 0x17 # (DW_FORM_sec_offset)
.byte 0
.byte 0
.uleb128 0x2 # (abbrev code)
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
.byte 0 # DW_children_no
.uleb128 0x3 # (DW_AT_name)
.uleb128 0x8 # (DW_FORM_string)
.uleb128 0x3a # (DW_AT_decl_file)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3b # (DW_AT_decl_line)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x27 # (DW_AT_prototyped)
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x49 # (DW_AT_type)
.uleb128 0x13 # (DW_FORM_ref4)
.uleb128 0x11 # (DW_AT_low_pc)
.uleb128 0x1 # (DW_FORM_addr)
.uleb128 0x12 # (DW_AT_high_pc)
.uleb128 0x6 # (DW_FORM_data4)
.uleb128 0x40 # (DW_AT_frame_base)
.uleb128 0x18 # (DW_FORM_exprloc)
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
.uleb128 0x19 # (DW_FORM_flag_present)
.byte 0
.byte 0
.uleb128 0x3 # (abbrev code)
.uleb128 0x24 # (TAG: DW_TAG_base_type)
.byte 0 # DW_children_no
.uleb128 0xb # (DW_AT_byte_size)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3e # (DW_AT_encoding)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3 # (DW_AT_name)
.uleb128 0x8 # (DW_FORM_string)
.byte 0
.byte 0
.uleb128 0x4 # (abbrev code)
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
.byte 0x1 # DW_children_yes
.uleb128 0x3 # (DW_AT_name)
.uleb128 0x8 # (DW_FORM_string)
.uleb128 0x3a # (DW_AT_decl_file)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3b # (DW_AT_decl_line)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x27 # (DW_AT_prototyped)
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x49 # (DW_AT_type)
.uleb128 0x13 # (DW_FORM_ref4)
.uleb128 0x11 # (DW_AT_low_pc)
.uleb128 0x1 # (DW_FORM_addr)
.uleb128 0x12 # (DW_AT_high_pc)
.uleb128 0x6 # (DW_FORM_data4)
.uleb128 0x40 # (DW_AT_frame_base)
.uleb128 0x18 # (DW_FORM_exprloc)
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x1 # (DW_AT_sibling)
.uleb128 0x13 # (DW_FORM_ref4)
.byte 0
.byte 0
.uleb128 0x5 # (abbrev code)
.uleb128 0x4109 # (TAG: DW_TAG_GNU_call_site)
.byte 0 # DW_children_no
.uleb128 0x11 # (DW_AT_low_pc)
.uleb128 0x1 # (DW_FORM_addr)
.uleb128 0x2115 # (DW_AT_GNU_tail_call)
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x31 # (DW_AT_abstract_origin)
.uleb128 0x13 # (DW_FORM_ref4)
.byte 0
.byte 0
.uleb128 0x6 # (abbrev code)
.uleb128 0x2e # (TAG: DW_TAG_subprogram)
.byte 0x1 # DW_children_yes
.uleb128 0x3f # (DW_AT_external)
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x3 # (DW_AT_name)
.uleb128 0xe # (DW_FORM_strp)
.uleb128 0x3a # (DW_AT_decl_file)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3b # (DW_AT_decl_line)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x27 # (DW_AT_prototyped)
.uleb128 0x19 # (DW_FORM_flag_present)
.uleb128 0x49 # (DW_AT_type)
.uleb128 0x13 # (DW_FORM_ref4)
.uleb128 0x11 # (DW_AT_low_pc)
.uleb128 0x1 # (DW_FORM_addr)
.uleb128 0x12 # (DW_AT_high_pc)
.uleb128 0x6 # (DW_FORM_data4)
.uleb128 0x40 # (DW_AT_frame_base)
.uleb128 0x18 # (DW_FORM_exprloc)
.uleb128 0x2117 # (DW_AT_GNU_all_call_sites)
.uleb128 0x19 # (DW_FORM_flag_present)
.byte 0
.byte 0
.uleb128 0x7 # (abbrev code)
.uleb128 0x34 # (TAG: DW_TAG_variable)
.byte 0 # DW_children_no
.uleb128 0x3 # (DW_AT_name)
.uleb128 0xe # (DW_FORM_strp)
.uleb128 0x3a # (DW_AT_decl_file)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x3b # (DW_AT_decl_line)
.uleb128 0xb # (DW_FORM_data1)
.uleb128 0x49 # (DW_AT_type)
.uleb128 0x13 # (DW_FORM_ref4)
.uleb128 0x2 # (DW_AT_location)
.uleb128 0x17 # (DW_FORM_sec_offset)
.byte 0
.byte 0
.uleb128 0x8 # (abbrev code)
.uleb128 0x4109 # (TAG: DW_TAG_GNU_call_site)
.byte 0 # DW_children_no
.uleb128 0x11 # (DW_AT_low_pc)
.uleb128 0x1 # (DW_FORM_addr)
.uleb128 0x31 # (DW_AT_abstract_origin)
.uleb128 0x13 # (DW_FORM_ref4)
.byte 0
.byte 0
.byte 0
.section .debug_loc,"",@progbits
.Ldebug_loc0:
.LLST0:
.long .LVL1 # Location list begin address (*.LLST0)
.long .LVL2 # Location list end address (*.LLST0)
.value 0x3 # Location expression size
.byte 0x70 # DW_OP_breg0
.sleb128 1
.byte 0x9f # DW_OP_stack_value
.long .LVL2 # Location list begin address (*.LLST0)
.long .LFE2 # Location list end address (*.LLST0)
.value 0x1 # Location expression size
.byte 0x50 # DW_OP_reg0
.long 0 # Location list terminator begin (*.LLST0)
.long 0 # Location list terminator end (*.LLST0)
.section .debug_aranges,"",@progbits
.long 0x24 # Length of Address Ranges Info
.value 0x2 # DWARF Version
.long .Ldebug_info0 # Offset of Compilation Unit Info
.byte 0x4 # Size of Address
.byte 0 # Size of Segment Descriptor
.value 0 # Pad to 8 byte boundary
.value 0
.long .Ltext0 # Address
.long .Letext0-.Ltext0 # Length
.long .LFB2 # Address
.long .LFE2-.LFB2 # Length
.long 0
.long 0
.section .debug_ranges,"",@progbits
.Ldebug_ranges0:
.long .Ltext0 # Offset 0
.long .Letext0
.long .LFB2 # Offset 0x8
.long .LFE2
.long 0
.long 0
.section .debug_line,"",@progbits
.Ldebug_line0:
.section .debug_str,"MS",@progbits,1
.LASF1:
.string "tailcall.c"
.LASF3:
.string "main"
.LASF0:
.string "GNU C 4.8.3 20140911 (Red Hat 4.8.3-7) -mtune=generic -march=i686 -g -O2"
.LASF4:
.string "answer"
.LASF2:
.string ""
.ident "GCC: (GNU) 4.8.3 20140911 (Red Hat 4.8.3-7)"
.section .note.GNU-stack,"",@progbits
|
