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author Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
date Tue, 16 Apr 2019 18:58:24 +0900
parents 32e35be2ce71
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51:5f949b153f65 52:73b27e5c1d79
1 2018-05-29----
2 ❯ lldb -- /Users/anatofuz/workspace/cr/Basic/build_perl6/bin/moar nqp.moarvm examples/hello_world.nqp [13:52:54]
3 (lldb) target create "/Users/anatofuz/workspace/cr/Basic/build_perl6/bin/moar"
4 Current executable set to '/Users/anatofuz/workspace/cr/Basic/build_perl6/bin/moar' (x86_64).
5 (lldb) settings set -- target.run-args "nqp.moarvm" "examples/hello_world.nqp"
6 (lldb) b add_bb_facts
7 Breakpoint 1: where = libmoar.dylib`add_bb_facts + 32 at facts.c:362, address = 0x0000000000118540
8 (lldb) c
9 error: invalid process
10 (lldb) run
11 Process 8479 launched: '/Users/anatofuz/workspace/cr/Basic/build_perl6/bin/moar' (x86_64)
12 Process 8479 stopped
13 * thread #2, stop reason = breakpoint 1.1
14 frame #0: 0x00000001001bb540 libmoar.dylib`add_bb_facts(tc=0x0000000100802e30, g=0x0000000100f4efe0, bb=0x0000000102115e00, p=0x0000000100f514d0, cur_deopt_idx=-1) at facts.c:362
15 359 MVMint32 i, is_phi;
16 360
17 361 /* Look for instructions that provide or propagate facts. */
18 -> 362 MVMSpeshIns *ins = bb->first_ins;
19 363 while (ins) {
20 364 /* See if there's deopt and logged annotations. Sync cur_deopt_idx
21 365 * and, for logged+deopt-one, add logged facts and guards. */
22 Target 0: (moar) stopped.
23 (lldb) bt
24 * thread #2, stop reason = breakpoint 1.1
25 * frame #0: 0x00000001001bb540 libmoar.dylib`add_bb_facts(tc=0x0000000100802e30, g=0x0000000100f4efe0, bb=0x0000000102115e00, p=0x0000000100f514d0, cur_deopt_idx=-1) at facts.c:362
26 frame #1: 0x00000001001bb503 libmoar.dylib`MVM_spesh_facts_discover(tc=0x0000000100802e30, g=0x0000000100f4efe0, p=0x0000000100f514d0) at facts.c:659
27 frame #2: 0x00000001001b4eb7 libmoar.dylib`MVM_spesh_candidate_add(tc=0x0000000100802e30, p=0x0000000100f514d0) at candidate.c:61
28 frame #3: 0x00000001001cf991 libmoar.dylib`worker(tc=0x0000000100802e30, callsite=0x00000001006c9150, args=0x0000000000000000) at worker.c:16
29 frame #4: 0x000000010014e8e2 libmoar.dylib`invoke_handler(tc=0x0000000100802e30, invokee=0x0000000102014840, callsite=0x00000001006c9150, args=0x0000000000000000) at MVMCFunction.c:9
30 frame #5: 0x00000001000e8494 libmoar.dylib`thread_initial_invoke(tc=0x0000000100802e30, data=0x0000000100802050) at threads.c:59
31 frame #6: 0x00000001000aefee libmoar.dylib`MVM_interp_run(tc=0x0000000100802e30, initial_invoke=(libmoar.dylib`thread_initial_invoke at threads.c:50), invoke_data=0x0000000100802050) at interp.c:93
32 frame #7: 0x00000001000e7a35 libmoar.dylib`start_thread(data=0x0000000100802050) at threads.c:87
33 frame #8: 0x00007fff7b9fe661 libsystem_pthread.dylib`_pthread_body + 340
34 frame #9: 0x00007fff7b9fe50d libsystem_pthread.dylib`_pthread_start + 377
35 frame #10: 0x00007fff7b9fdbf9 libsystem_pthread.dylib`thread_start + 13
36
37 (lldb) n
38 Process 8479 stopped
39 * thread #2, stop reason = step over
40 frame #0: 0x00000001001bb579 libmoar.dylib`add_bb_facts(tc=0x0000000100802e30, g=0x0000000100f4efe0, bb=0x0000000102115e00, p=0x0000000100f514d0, cur_deopt_idx=-1) at facts.c:370
41 367 MVMSpeshAnn *ann_deopt_one = NULL;
42 368 MVMSpeshAnn *ann_logged = NULL;
43 369 MVMint32 is_deopt_ins = 0;
44 -> 370 while (ann) {
45 371 switch (ann->type) {
46 372 case MVM_SPESH_ANN_DEOPT_ONE_INS:
47 373 ann_deopt_one = ann;
48 Target 0: (moar) stopped.
49 (lldb)
50 Process 8479 stopped
51 * thread #2, stop reason = step over
52 frame #0: 0x00000001001bb620 libmoar.dylib`add_bb_facts(tc=0x0000000100802e30, g=0x0000000100f4efe0, bb=0x0000000102115e00, p=0x0000000100f514d0, cur_deopt_idx=-1) at facts.c:385
53 382 }
54 383 ann = ann->next;
55 384 }
56 -> 385 if (ann_deopt_one && ann_logged)
57 386 log_facts(tc, g, bb, ins, p, ann_deopt_one, ann_logged);
58 387
59 388 /* Look through operands for reads and writes. */
60 Target 0: (moar) stopped.
61 (lldb) l
62 389 is_phi = ins->info->opcode == MVM_SSA_PHI;
63 390 for (i = 0; i < ins->info->num_operands; i++) {
64 391 /* Reads need usage tracking; if the read is after a deopt point
65 392 * relative to the write then give it an extra usage bump. */
66 393 if ((is_phi && i > 0)
67 394 || (!is_phi && (ins->info->operands[i] & MVM_operand_rw_mask) == MVM_operand_read_reg)) {
68 395 MVMSpeshFacts *facts = &(g->facts[ins->operands[i].reg.orig][ins->operands[i].reg.i]);
69 (lldb) l
70 396 facts->usages += facts->deopt_idx == cur_deopt_idx ? 1 : 2;
71 397 }
72 398
73 399 /* Writes need the current deopt index and the writing instruction
74 400 * to be specified. A write that's on a deopt instruction bumps
75 401 * the usage too. */
76 402 if ((is_phi && i == 0)
77 (lldb) n
78 Process 8479 stopped
79 * thread #2, stop reason = step over
80 frame #0: 0x00000001001bb65b libmoar.dylib`add_bb_facts(tc=0x0000000100802e30, g=0x0000000100f4efe0, bb=0x0000000102115e00, p=0x0000000100f514d0, cur_deopt_idx=-1) at facts.c:389
81 386 log_facts(tc, g, bb, ins, p, ann_deopt_one, ann_logged);
82 387
83 388 /* Look through operands for reads and writes. */
84 -> 389 is_phi = ins->info->opcode == MVM_SSA_PHI;
85 390 for (i = 0; i < ins->info->num_operands; i++) {
86 391 /* Reads need usage tracking; if the read is after a deopt point
87 392 * relative to the write then give it an extra usage bump. */
88 Target 0: (moar) stopped.
89 (lldb) p MVM_SSA_PHI
90 error: use of undeclared identifier 'MVM_SSA_PHI'
91 (lldb) nexr
92 error: 'nexr' is not a valid command.
93 error: Unrecognized command 'nexr'.
94 (lldb) n
95 Process 8479 stopped
96 * thread #2, stop reason = step over
97 frame #0: 0x00000001001bb677 libmoar.dylib`add_bb_facts(tc=0x0000000100802e30, g=0x0000000100f4efe0, bb=0x0000000102115e00, p=0x0000000100f514d0, cur_deopt_idx=-1) at facts.c:390
98 387
99 388 /* Look through operands for reads and writes. */
100 389 is_phi = ins->info->opcode == MVM_SSA_PHI;
101 -> 390 for (i = 0; i < ins->info->num_operands; i++) {
102 391 /* Reads need usage tracking; if the read is after a deopt point
103 392 * relative to the write then give it an extra usage bump. */
104 393 if ((is_phi && i > 0)
105 Target 0: (moar) stopped.
106 (lldb) p is_phi
107 (MVMint32) $14 = 0
108 (lldb) p ins
109 (MVMSpeshIns *) $15 = 0x0000000102115e60
110 (lldb) p *ins
111 (MVMSpeshIns) $16 = {
112 info = 0x00000001005757c0
113 operands = 0x0000000000000000
114 prev = 0x0000000000000000
115 next = 0x0000000000000000
116 annotations = 0x0000000000000000
117 }
118 (lldb) p *ins->info
119 (MVMOpInfo) $17 = {
120 opcode = 0
121 name = 0x00000001002def92 "no_op"
122 mark = {
123 [0] = ' '
124 [1] = ' '
125 }
126 num_operands = 0
127 pure = '\0'
128 deopt_point = '\0'
129 logged = '\0'
130 no_inline = '\0'
131 jittivity = '\0'
132 uses_hll = '\0'
133 operands = ([0] = '\0', [1] = '\0', [2] = '\0', [3] = '\0', [4] = '\0', [5] = '\0', [6] = '\0', [7] = '\0')
134 }
135
136
137 * profilingの箇所を見ていく
138
139 * perlスクリプトをperl6に移植する
140 * markdownのparserみたいなのを書き換えてみるなど
141 * タイトループを早くするのか，ここのハッシュを早くするのか，オブジェクトのオペレーションを早くするのか…
142 * 手近な場所をとにかく見ていきたい
143
144 * native codeをやるのかvmをやるのか
145
146 * bytecode interpureter, gc関連を書き直すという手もある
147
148 * gcc vs clang
149
150 * llvm側でtail coll呼び出す時はフラグを見ている
151 * code grarであるというフラグを渡している感じ
152
153 * script言語--> 上手く並列化出来ない
154
155 * targetとしてCbCのコードを吐く
156 * 継続コード(meta level)
157 * 継続コードを見て計算結果を見て変えていく
158 * MoarVMのJIT，nqpのコンパイラにcbcを生成する部分を入れる
159 * perlccみたいなものをいれる
160 * targetのアプリケーション...whileでstring matchをする部分を最適化する
161
162 * 正規表現の箇所をターゲットとして書くのも手…!?
163 * fileをmmapを使うかどうかなど
164 * 並列のgrep
165 * 早くなるには早くなる
166 * cache prefetchの処理でも高速化出来る
167
168
169 ----------
170 2018-06-05----
171 MoarVMが実際にインタプリタとして走っているのはMVM_interp_runという関数らしい．
172 これはスレッド毎に用意されるらしい
173
174 定義自体は `src/core/interp.c`に書かれている
175
176 MVMInstancとかいう構造体に全ての情報が入っている
177
178 MVM_cu_map_from_fileでスレッド情報とファイルから生成した結果をMVMCompUnit構造体として生成している
179
180 DISPATCHでNEXT_OPを判断している，これはオペランドリストとswitch文が同じオーダーで書かれているので
181 最適化しやすいらしい
182
183 MVM_interp_runの後DISPATCHというマクロでNEXT_OPというマクロに応じて処理を行っているが
184 これがMoarVMのバイトコードを一対一対応しているので5000行のcase文が生成されている
185
186
187 ----------