This patch changes the AST mark function so that it will walk through
nodes in the NODE buffer marking Ruby objects rather than using a mark
array to guarantee liveness. The reason I want to do this is so that
when compaction happens on major GCs, node objects will have their
references pinned (or possibly we can update them correctly).
This is broken at least since 2.5 (I didn't check earlier versions).
It resulted in failure in test_ast.rb when the tests were added before
the parser change.
Basically, in remove_duplicate_keys, if the node is modified, set
the location information to the previous location information. The
removal of keys should not affect the location in the code.
Previously, **{} was removed by the parser:
```
$ ruby --dump=parse -e '{**{}}'
@ NODE_SCOPE (line: 1, location: (1,0)-(1,6))
+- nd_tbl: (empty)
+- nd_args:
| (null node)
+- nd_body:
@ NODE_HASH (line: 1, location: (1,0)-(1,6))*
+- nd_brace: 1 (hash literal)
+- nd_head:
(null node)
```
Since it was removed by the parser, the compiler did not know
about it, and `m(**{})` was therefore treated as `m()`.
This modifies the parser to not remove the `**{}`. A simple
approach for this is fairly simple by just removing a few
lines from the parser, but that would cause two hash
allocations every time it was used. The approach taken here
modifies both the parser and the compiler, and results in `**{}`
not allocating any hashes in the usual case.
The basic idea is we use a literal node in the parser containing
a frozen empty hash literal. In the compiler, we recognize when
that is used, and if it is the only keyword present, we just
push it onto the VM stack (no creation of a new hash or merging
of keywords). If it is the first keyword present, we push a
new empty hash onto the VM stack, so that later keywords can
merge into it. If it is not the first keyword present, we can
ignore it, since the there is no reason to merge an empty hash
into the existing hash.
Example instructions for `m(**{})`
Before (note ARGS_SIMPLE):
```
== disasm: #<ISeq:<main>@-e:1 (1,0)-(1,7)> (catch: FALSE)
0000 putself ( 1)[Li]
0001 opt_send_without_block <callinfo!mid:m, argc:0, FCALL|ARGS_SIMPLE>, <callcache>
0004 leave
```
After (note putobject and KW_SPLAT):
```
== disasm: #<ISeq:<main>@-e:1 (1,0)-(1,7)> (catch: FALSE)
0000 putself ( 1)[Li]
0001 putobject {}
0003 opt_send_without_block <callinfo!mid:m, argc:1, FCALL|KW_SPLAT>, <callcache>
0006 leave
```
Example instructions for `m(**h, **{})`
Before and After (no change):
```
== disasm: #<ISeq:<main>@-e:1 (1,0)-(1,12)> (catch: FALSE)
0000 putself ( 1)[Li]
0001 putspecialobject 1
0003 newhash 0
0005 putself
0006 opt_send_without_block <callinfo!mid:h, argc:0, FCALL|VCALL|ARGS_SIMPLE>, <callcache>
0009 opt_send_without_block <callinfo!mid:core#hash_merge_kwd, argc:2, ARGS_SIMPLE>, <callcache>
0012 opt_send_without_block <callinfo!mid:m, argc:1, FCALL|KW_SPLAT>, <callcache>
0015 leave
```
Example instructions for `m(**{}, **h)`
Before:
```
== disasm: #<ISeq:<main>@-e:1 (1,0)-(1,12)> (catch: FALSE)
0000 putself ( 1)[Li]
0001 putspecialobject 1
0003 newhash 0
0005 putself
0006 opt_send_without_block <callinfo!mid:h, argc:0, FCALL|VCALL|ARGS_SIMPLE>, <callcache>
0009 opt_send_without_block <callinfo!mid:core#hash_merge_kwd, argc:2, ARGS_SIMPLE>, <callcache>
0012 opt_send_without_block <callinfo!mid:m, argc:1, FCALL|KW_SPLAT>, <callcache>
0015 leave
```
After (basically the same except for the addition of swap):
```
== disasm: #<ISeq:<main>@-e:1 (1,0)-(1,12)> (catch: FALSE)
0000 putself ( 1)[Li]
0001 newhash 0
0003 putspecialobject 1
0005 swap
0006 putself
0007 opt_send_without_block <callinfo!mid:h, argc:0, FCALL|VCALL|ARGS_SIMPLE>, <callcache>
0010 opt_send_without_block <callinfo!mid:core#hash_merge_kwd, argc:2, ARGS_SIMPLE>, <callcache>
0013 opt_send_without_block <callinfo!mid:m, argc:1, FCALL|KW_SPLAT>, <callcache>
0016 leave
```
This reverts the changes to parse.y in
a5b37262524ac39d2af13eea174486370a581c23 as they are not actually
needed and cause the warning for duplicate hash keys to not be
emitted.
The on_params hook will use :nil as the keyword rest argument.
There is a new on_nokw_param hook as well.
This fixes a type issue in the previous code, where an ID was
passed where a VALUE was the declared type. The symbol :nil is
passed instead of the id.
This syntax means the method should be treated as a method that
uses keyword arguments, but no specific keyword arguments are
supported, and therefore calling the method with keyword arguments
will raise an ArgumentError. It is still allowed to double splat
an empty hash when calling the method, as that does not pass
any keyword arguments.
`rb_ast_t` holds a reference to this object, so it should mark the
object. Currently it is relying on the `mark_ary` on `node_buffer` to
ensure that the object stays alive. But since the array internals can
move, this could cause a segv if compaction impacts the array.
Single assignment with rescue modifier applies rescue to the RHS:
a = raise rescue 1 # a = (raise rescue 1)
Previously, multiple assignment with rescue modifier applied rescue
to the entire expression:
a, b = raise rescue [1, 2] # (a, b = raise) rescue [1, 2]
This makes multiple assignment with rescue modifier consistent with
single assignment with rescue modifier, applying rescue to the RHS:
a, b = raise rescue [1, 2] # a, b = (raise rescue [1, 2])
Implements [Feature #8239]
Fixes [Bug #8279]
This reverts commit 326c00b6f8.
We also confirmed that test_gced_eval_location fails without the changes:
56741781820190804T000003Z.fail.html.gz
20190804T003005Z.fail.html.gz
20190804T000007Z.fail.html.gz
20190804T001806Z.fail.html.gz
20190804T003005Z.fail.html.gz
* parse.y (yycompile): make sure in advance that the `__FILE__`
object shares a fstring, to get rid of dangling path name.
Fixed up 53e9908d8a. [Bug #16041]
* vm_eval.c (eval_make_iseq): ditto.
As a comment token includes the newline, so delayed newline token
just follows it should not be dispatched. [Bug #11485]
Co-Authored-By: Jeremy Evans <code@jeremyevans.net>
* parse.y (value_expr_check): if either of `then` or `else`
statements is not a void value expression, the whole `if` is not
also a void value expression. [Bug #15932]
* string.c (str_replace_shared_without_enc): free previous buffer
before replaced.
* parse.y (gettable): make sure in advance that the `__FILE__`
object shares a fstring, to get rid of replacement with the
fstring later.
TODO: this hack may be needed in other places.
[Bug #15916]
Co-Authored-By: luke-gru (Luke Gruber) <luke.gru@gmail.com>
