Option `--dump`

For other argument values, see Option .

For the examples here, we use this program:

$ cat t.rb
puts 'Foo'

The supported dump items:

insns: Instruction sequences:

```sh
$ ruby --dump=insns t.rb
== disasm: #<ISeq:<main>@t.rb:1 (1,0)-(1,10)> (catch: FALSE)
0000 putself                                                          (   1)[Li]
0001 dupstring                              "Foo"
0003 opt_send_without_block                 <calldata!mid:puts, argc:1, FCALL|ARGS_SIMPLE>
0005 leave
```

parsetree: Abstract syntax tree (AST):

```console
$ ruby --dump=parsetree t.rb
###########################################################
## Do NOT use this node dump for any purpose other than  ##
## debug and research.  Compatibility is not guaranteed. ##
###########################################################

# @ NODE_SCOPE (line: 1, location: (1,0)-(1,10))
# +- nd_tbl: (empty)
# +- nd_args:
# |   (null node)
# +- nd_body:
#     @ NODE_FCALL (line: 1, location: (1,0)-(1,10))*
#     +- nd_mid: :puts
#     +- nd_args:
#         @ NODE_LIST (line: 1, location: (1,5)-(1,10))
#         +- nd_alen: 1
#         +- nd_head:
#         |   @ NODE_STR (line: 1, location: (1,5)-(1,10))
#         |   +- nd_lit: "Foo"
#         +- nd_next:
#             (null node)
```

yydebug: Debugging information from yacc parser generator:

```
$ ruby --dump=yydebug t.rb
Starting parse
Entering state 0
Reducing stack by rule 1 (line 1295):
lex_state: NONE -> BEG at line 1296
vtable_alloc:12392: 0x0000558453df1a00
vtable_alloc:12393: 0x0000558453df1a60
cmdarg_stack(push): 0 at line 12406
cond_stack(push): 0 at line 12407
#=> $$ = nterm $@1 (1.0-1.0: )
Stack now 0
Entering state 2
Reading a token:
lex_state: BEG -> CMDARG at line 9049
Next token is token "local variable or method" (1.0-1.4: puts)
Shifting token "local variable or method" (1.0-1.4: puts)
Entering state 35
Reading a token: Next token is token "string literal" (1.5-1.6: )
Reducing stack by rule 742 (line 5567):
$1 = token "local variable or method" (1.0-1.4: puts)
#=> $$ = nterm operation (1.0-1.4: )
Stack now 0 2
Entering state 126
Reducing stack by rule 78 (line 1794):
$1 = nterm operation (1.0-1.4: )
#=> $$ = nterm fcall (1.0-1.4: )
Stack now 0 2
Entering state 80
Next token is token "string literal" (1.5-1.6: )
Reducing stack by rule 292 (line 2723):
cmdarg_stack(push): 1 at line 2737
#=> $$ = nterm $@16 (1.4-1.4: )
Stack now 0 2 80
Entering state 235
Next token is token "string literal" (1.5-1.6: )
Shifting token "string literal" (1.5-1.6: )
Entering state 216
Reducing stack by rule 607 (line 4706):
#=> $$ = nterm string_contents (1.6-1.6: )
Stack now 0 2 80 235 216
Entering state 437
Reading a token: Next token is token "literal content" (1.6-1.9: "Foo")
Shifting token "literal content" (1.6-1.9: "Foo")
Entering state 503
Reducing stack by rule 613 (line 4802):
$1 = token "literal content" (1.6-1.9: "Foo")
#=> $$ = nterm string_content (1.6-1.9: )
Stack now 0 2 80 235 216 437
Entering state 507
Reducing stack by rule 608 (line 4716):
$1 = nterm string_contents (1.6-1.6: )
$2 = nterm string_content (1.6-1.9: )
#=> $$ = nterm string_contents (1.6-1.9: )
Stack now 0 2 80 235 216
Entering state 437
Reading a token:
lex_state: CMDARG -> END at line 7276
Next token is token "terminator" (1.9-1.10: )
Shifting token "terminator" (1.9-1.10: )
Entering state 508
Reducing stack by rule 590 (line 4569):
$1 = token "string literal" (1.5-1.6: )
$2 = nterm string_contents (1.6-1.9: )
$3 = token "terminator" (1.9-1.10: )
#=> $$ = nterm string1 (1.5-1.10: )
Stack now 0 2 80 235
Entering state 109
Reducing stack by rule 588 (line 4559):
$1 = nterm string1 (1.5-1.10: )
#=> $$ = nterm string (1.5-1.10: )
Stack now 0 2 80 235
Entering state 108
Reading a token:
lex_state: END -> BEG at line 9200
Next token is token '\n' (1.10-1.10: )
Reducing stack by rule 586 (line 4541):
$1 = nterm string (1.5-1.10: )
#=> $$ = nterm strings (1.5-1.10: )
Stack now 0 2 80 235
Entering state 107
Reducing stack by rule 307 (line 2837):
$1 = nterm strings (1.5-1.10: )
#=> $$ = nterm primary (1.5-1.10: )
Stack now 0 2 80 235
Entering state 90
Next token is token '\n' (1.10-1.10: )
Reducing stack by rule 261 (line 2553):
$1 = nterm primary (1.5-1.10: )
#=> $$ = nterm arg (1.5-1.10: )
Stack now 0 2 80 235
Entering state 220
Next token is token '\n' (1.10-1.10: )
Reducing stack by rule 270 (line 2586):
$1 = nterm arg (1.5-1.10: )
#=> $$ = nterm arg_value (1.5-1.10: )
Stack now 0 2 80 235
Entering state 221
Next token is token '\n' (1.10-1.10: )
Reducing stack by rule 297 (line 2779):
$1 = nterm arg_value (1.5-1.10: )
#=> $$ = nterm args (1.5-1.10: )
Stack now 0 2 80 235
Entering state 224
Next token is token '\n' (1.10-1.10: )
Reducing stack by rule 772 (line 5626):
#=> $$ = nterm none (1.10-1.10: )
Stack now 0 2 80 235 224
Entering state 442
Reducing stack by rule 296 (line 2773):
$1 = nterm none (1.10-1.10: )

#=> $$ = nterm opt_block_arg (1.10-1.10: )
Stack now 0 2 80 235 224
Entering state 441
Reducing stack by rule 288 (line 2696):
$1 = nterm args (1.5-1.10: )
$2 = nterm opt_block_arg (1.10-1.10: )
#=> $$ = nterm call_args (1.5-1.10: )
Stack now 0 2 80 235
Entering state 453
Reducing stack by rule 293 (line 2723):
$1 = nterm $@16 (1.4-1.4: )
$2 = nterm call_args (1.5-1.10: )
cmdarg_stack(pop): 0 at line 2754
#=> $$ = nterm command_args (1.4-1.10: )
Stack now 0 2 80
Entering state 333
Next token is token '\n' (1.10-1.10: )
Reducing stack by rule 79 (line 1804):
$1 = nterm fcall (1.0-1.4: )
$2 = nterm command_args (1.4-1.10: )
#=> $$ = nterm command (1.0-1.10: )
Stack now 0 2
Entering state 81
Next token is token '\n' (1.10-1.10: )
Reducing stack by rule 73 (line 1770):
$1 = nterm command (1.0-1.10: )
#=> $$ = nterm command_call (1.0-1.10: )
Stack now 0 2
Entering state 78
Reducing stack by rule 51 (line 1659):
$1 = nterm command_call (1.0-1.10: )
#=> $$ = nterm expr (1.0-1.10: )
Stack now 0 2
Entering state 75
Next token is token '\n' (1.10-1.10: )
Reducing stack by rule 39 (line 1578):
$1 = nterm expr (1.0-1.10: )
#=> $$ = nterm stmt (1.0-1.10: )
Stack now 0 2
Entering state 73
Next token is token '\n' (1.10-1.10: )
Reducing stack by rule 8 (line 1354):
$1 = nterm stmt (1.0-1.10: )
#=> $$ = nterm top_stmt (1.0-1.10: )
Stack now 0 2
Entering state 72
Reducing stack by rule 5 (line 1334):
$1 = nterm top_stmt (1.0-1.10: )
#=> $$ = nterm top_stmts (1.0-1.10: )
Stack now 0 2
Entering state 71
Next token is token '\n' (1.10-1.10: )
Shifting token '\n' (1.10-1.10: )
Entering state 311
Reducing stack by rule 769 (line 5618):
$1 = token '\n' (1.10-1.10: )
#=> $$ = nterm term (1.10-1.10: )
Stack now 0 2 71
Entering state 313
Reducing stack by rule 770 (line 5621):
$1 = nterm term (1.10-1.10: )
#=> $$ = nterm terms (1.10-1.10: )
Stack now 0 2 71
Entering state 314
Reading a token: Now at end of input.
Reducing stack by rule 759 (line 5596):
$1 = nterm terms (1.10-1.10: )
#=> $$ = nterm opt_terms (1.10-1.10: )
Stack now 0 2 71
Entering state 312
Reducing stack by rule 3 (line 1321):
$1 = nterm top_stmts (1.0-1.10: )
$2 = nterm opt_terms (1.10-1.10: )
#=> $$ = nterm top_compstmt (1.0-1.10: )
Stack now 0 2
Entering state 70
Reducing stack by rule 2 (line 1295):
$1 = nterm $@1 (1.0-1.0: )
$2 = nterm top_compstmt (1.0-1.10: )
vtable_free:12426: p->lvtbl->args(0x0000558453df1a00)
vtable_free:12427: p->lvtbl->vars(0x0000558453df1a60)
cmdarg_stack(pop): 0 at line 12428
cond_stack(pop): 0 at line 12429
#=> $$ = nterm program (1.0-1.10: )
Stack now 0
Entering state 1
Now at end of input.
Shifting token "end-of-input" (1.10-1.10: )
Entering state 3
Stack now 0 1 3
Cleanup: popping token "end-of-input" (1.10-1.10: )
Cleanup: popping nterm program (1.0-1.10: )
```

Additional flags can follow dump items.

+comment: Add comments to AST.
+error-tolerant: Parse in error-tolerant mode.
-optimize: Disable optimizations for instruction sequences.

Option --dump

Option `--dump`