* [ruby-core:107459] [Ruby master Bug#18569] RubyVM::InstructionSequence#disasm returns nil for composed functions
@ 2022-02-03 10:46 GabrielMalakias (Gabriel Malaquias)
2022-02-03 12:58 ` [ruby-core:107465] " byroot (Jean Boussier)
2022-02-04 21:12 ` [ruby-core:107488] " jeremyevans0 (Jeremy Evans)
0 siblings, 2 replies; 3+ messages in thread
From: GabrielMalakias (Gabriel Malaquias) @ 2022-02-03 10:46 UTC (permalink / raw
To: ruby-core
Issue #18569 has been reported by GabrielMalakias (Gabriel Malaquias).
----------------------------------------
Bug #18569: RubyVM::InstructionSequence#disasm returns nil for composed functions
https://bugs.ruby-lang.org/issues/18569
* Author: GabrielMalakias (Gabriel Malaquias)
* Status: Open
* Priority: Normal
* ruby -v: 3.1.0
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
I was testing function composition Proc#>> (https://ruby-doc.org/core-2.6/Proc.html#method-i-3E-3E) and noticed that when disassembling composed functions it always returns nil.
``` ruby
first_proc = proc { |x| x + 2 }
puts RubyVM::InstructionSequence.disasm(first_proc)
# returns
# == disasm: #<ISeq:block in <main>@disasm.rb:3 (3,18)-(3,31)> (catch: FALSE)
# local table (size: 1, argc: 1 [opts: 0, rest: -1, post: 0, block: -1, kw: -1@-1, kwrest: -1])
# [ 1] x@0<Arg>
# 0000 getlocal_WC_0 x@0 ( 3)[LiBc]
# 0002 putobject 2
# 0004 opt_plus <calldata!mid:+, argc:1, ARGS_SIMPLE>[CcCr]
# 0006 leave [Br]
# -------------------------------------
puts RubyVM::InstructionSequence.disasm(first_proc >> first_proc)
# return nil
```
Is this expected or there is something weird happening here? I'm happy to help fixing it with some help in case it's a bug
---Files--------------------------------
disasm.rb (631 Bytes)
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
* [ruby-core:107465] [Ruby master Bug#18569] RubyVM::InstructionSequence#disasm returns nil for composed functions
2022-02-03 10:46 [ruby-core:107459] [Ruby master Bug#18569] RubyVM::InstructionSequence#disasm returns nil for composed functions GabrielMalakias (Gabriel Malaquias)
@ 2022-02-03 12:58 ` byroot (Jean Boussier)
2022-02-04 21:12 ` [ruby-core:107488] " jeremyevans0 (Jeremy Evans)
1 sibling, 0 replies; 3+ messages in thread
From: byroot (Jean Boussier) @ 2022-02-03 12:58 UTC (permalink / raw
To: ruby-core
Issue #18569 has been updated by byroot (Jean Boussier).
Don't take my word as definitive, but I'd say it's expected. `Proc#<<` return has no "source code":
```ruby
>> proc{}.source_location
=> ["(irb)", 4]
>> (proc{} << proc{}).source_location
=> nil
```
Think of it as a "delegator", it has no InstructionSequence of its own.
----------------------------------------
Bug #18569: RubyVM::InstructionSequence#disasm returns nil for composed functions
https://bugs.ruby-lang.org/issues/18569#change-96368
* Author: GabrielMalakias (Gabriel Malaquias)
* Status: Open
* Priority: Normal
* ruby -v: 3.1.0
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
I was testing function composition Proc#>> (https://ruby-doc.org/core-2.6/Proc.html#method-i-3E-3E) and noticed that when disassembling composed functions it always returns nil.
``` ruby
first_proc = proc { |x| x + 2 }
puts RubyVM::InstructionSequence.disasm(first_proc)
# returns
# == disasm: #<ISeq:block in <main>@disasm.rb:3 (3,18)-(3,31)> (catch: FALSE)
# local table (size: 1, argc: 1 [opts: 0, rest: -1, post: 0, block: -1, kw: -1@-1, kwrest: -1])
# [ 1] x@0<Arg>
# 0000 getlocal_WC_0 x@0 ( 3)[LiBc]
# 0002 putobject 2
# 0004 opt_plus <calldata!mid:+, argc:1, ARGS_SIMPLE>[CcCr]
# 0006 leave [Br]
# -------------------------------------
puts RubyVM::InstructionSequence.disasm(first_proc >> first_proc)
# return nil
```
Is this expected or there is something weird happening here? I'm happy to help fixing it with some help in case it's a bug
---Files--------------------------------
disasm.rb (631 Bytes)
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
* [ruby-core:107488] [Ruby master Bug#18569] RubyVM::InstructionSequence#disasm returns nil for composed functions
2022-02-03 10:46 [ruby-core:107459] [Ruby master Bug#18569] RubyVM::InstructionSequence#disasm returns nil for composed functions GabrielMalakias (Gabriel Malaquias)
2022-02-03 12:58 ` [ruby-core:107465] " byroot (Jean Boussier)
@ 2022-02-04 21:12 ` jeremyevans0 (Jeremy Evans)
1 sibling, 0 replies; 3+ messages in thread
From: jeremyevans0 (Jeremy Evans) @ 2022-02-04 21:12 UTC (permalink / raw
To: ruby-core
Issue #18569 has been updated by jeremyevans0 (Jeremy Evans).
Status changed from Open to Rejected
I agree, this is expected behavior, since there is no instruction sequence for a composed proc. If you would like an instruction sequence, you need to manually compose the proc in Ruby.
----------------------------------------
Bug #18569: RubyVM::InstructionSequence#disasm returns nil for composed functions
https://bugs.ruby-lang.org/issues/18569#change-96390
* Author: GabrielMalakias (Gabriel Malaquias)
* Status: Rejected
* Priority: Normal
* ruby -v: 3.1.0
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
I was testing function composition Proc#>> (https://ruby-doc.org/core-2.6/Proc.html#method-i-3E-3E) and noticed that when disassembling composed functions it always returns nil.
``` ruby
first_proc = proc { |x| x + 2 }
puts RubyVM::InstructionSequence.disasm(first_proc)
# returns
# == disasm: #<ISeq:block in <main>@disasm.rb:3 (3,18)-(3,31)> (catch: FALSE)
# local table (size: 1, argc: 1 [opts: 0, rest: -1, post: 0, block: -1, kw: -1@-1, kwrest: -1])
# [ 1] x@0<Arg>
# 0000 getlocal_WC_0 x@0 ( 3)[LiBc]
# 0002 putobject 2
# 0004 opt_plus <calldata!mid:+, argc:1, ARGS_SIMPLE>[CcCr]
# 0006 leave [Br]
# -------------------------------------
puts RubyVM::InstructionSequence.disasm(first_proc >> first_proc)
# return nil
```
Is this expected or there is something weird happening here? I'm happy to help fixing it with some help in case it's a bug
---Files--------------------------------
disasm.rb (631 Bytes)
--
https://bugs.ruby-lang.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-02-03 10:46 [ruby-core:107459] [Ruby master Bug#18569] RubyVM::InstructionSequence#disasm returns nil for composed functions GabrielMalakias (Gabriel Malaquias)
2022-02-03 12:58 ` [ruby-core:107465] " byroot (Jean Boussier)
2022-02-04 21:12 ` [ruby-core:107488] " jeremyevans0 (Jeremy Evans)
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