From c5fc1ce975ecdf1c6818714e47579c5d3531c4ca Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@ruby-lang.org>
Date: Mon, 6 Jun 2022 17:27:56 -0700
Subject: Emit special instruction for array literal + .(hash|min|max)

This commit introduces a new instruction `opt_newarray_send` which is
used when there is an array literal followed by either the `hash`,
`min`, or `max` method.

```
[a, b, c].hash
```

Will emit an `opt_newarray_send` instruction.  This instruction falls
back to a method call if the "interested" method has been monkey
patched.

Here are some examples of the instructions generated:

```
$ ./miniruby --dump=insns -e '[@a, @b].max'
== disasm: #<ISeq:<main>@-e:1 (1,0)-(1,12)> (catch: FALSE)
0000 getinstancevariable                    :@a, <is:0>               (   1)[Li]
0003 getinstancevariable                    :@b, <is:1>
0006 opt_newarray_send                      2, :max
0009 leave
$ ./miniruby --dump=insns -e '[@a, @b].min'
== disasm: #<ISeq:<main>@-e:1 (1,0)-(1,12)> (catch: FALSE)
0000 getinstancevariable                    :@a, <is:0>               (   1)[Li]
0003 getinstancevariable                    :@b, <is:1>
0006 opt_newarray_send                      2, :min
0009 leave
$ ./miniruby --dump=insns -e '[@a, @b].hash'
== disasm: #<ISeq:<main>@-e:1 (1,0)-(1,13)> (catch: FALSE)
0000 getinstancevariable                    :@a, <is:0>               (   1)[Li]
0003 getinstancevariable                    :@b, <is:1>
0006 opt_newarray_send                      2, :hash
0009 leave
```

[Feature #18897] [ruby-core:109147]

Co-authored-by: John Hawthorn <jhawthorn@github.com>
---
 defs/id.def | 1 +
 1 file changed, 1 insertion(+)

(limited to 'defs')

diff --git a/defs/id.def b/defs/id.def
index c8d7b6af3e..2ddde7be70 100644
--- a/defs/id.def
+++ b/defs/id.def
@@ -2,6 +2,7 @@
 firstline, predefined = __LINE__+1, %[\
   max
   min
+  hash
   freeze
   nil?
   inspect
-- 
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