[ruby-core:108281] [Ruby master Bug#18740] Unable to set a tracepoint on the code with rightward assignment
From:
"hurricup (Alexandr Evstigneev)" <noreply@...>
Date:
2022-04-18 10:00:42 UTC
List:
ruby-core #108281
Issue #18740 has been reported by hurricup (Alexandr Evstigneev).
----------------------------------------
Bug #18740: Unable to set a tracepoint on the code with rightward assignment
https://bugs.ruby-lang.org/issues/18740
* Author: hurricup (Alexandr Evstigneev)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
Affected ruby 3.1.1
Sample illustrating the problem (`test.rb`):
```
def foo
File.read("test.rb")
.split("\n")
.map(&:strip)
.reject(&:empty?)
.first(10) => lines
puts lines
end
TracePoint.new(:line){ puts 'Hi' }.enable(target: RubyVM::InstructionSequence.of(method :foo), target_line: 2)
foo
```
produces
```
<internal:trace_point>:212:in `enable': can not enable any hooks (ArgumentError)
```
iseq for method:
```
== disasm: #<ISeq:foo@/home/hurricup/test.rb:1 (1,0)-(9,3)> (catch: FALSE)
local table (size: 1, argc: 0 [opts: 0, rest: -1, post: 0, block: -1, kw: -1@-1, kwrest: -1])
[ 1] lines@0
0000 putnil ( 6)[LiCa]
0001 putnil
0002 putobject false
0004 putnil
0005 putnil
0006 opt_getinlinecache 15, <is:0> ( 2)
0009 putobject true
0011 getconstant :File
0013 opt_setinlinecache <is:0>
0015 putstring "test.rb"
0017 opt_send_without_block <calldata!mid:read, argc:1, ARGS_SIMPLE>
0019 putstring "\n" ( 3)
0021 opt_send_without_block <calldata!mid:split, argc:1, ARGS_SIMPLE>
0023 putobject :strip ( 4)
0025 send <calldata!mid:map, argc:0, ARGS_BLOCKARG>, nil
0028 putobject :empty? ( 5)
0030 send <calldata!mid:reject, argc:0, ARGS_BLOCKARG>, nil
0033 putobject 10 ( 6)
0035 opt_send_without_block <calldata!mid:first, argc:1, ARGS_SIMPLE>
0037 dup
0038 setlocal_WC_0 lines@0
0040 jump 88
0042 putspecialobject 1 ( 2)
0044 topn 4
0046 branchif 64
0048 putobject NoMatchingPatternError
0050 putspecialobject 1
0052 putobject "%p: %s"
0054 topn 4
0056 topn 7
0058 opt_send_without_block <calldata!mid:core#sprintf, argc:3, ARGS_SIMPLE>
0060 opt_send_without_block <calldata!mid:core#raise, argc:2, ARGS_SIMPLE>
0062 jump 84
0064 putobject NoMatchingPatternKeyError
0066 putspecialobject 1
0068 putobject "%p: %s"
0070 topn 4
0072 topn 7
0074 opt_send_without_block <calldata!mid:core#sprintf, argc:3, ARGS_SIMPLE>
0076 topn 7
0078 topn 9
0080 opt_send_without_block <calldata!mid:new, argc:3, kw:[matchee,key], KWARG>
0082 opt_send_without_block <calldata!mid:core#raise, argc:1, ARGS_SIMPLE>
0084 adjuststack 7
0086 jump 90
0088 adjuststack 6 ( 6)
0090 putself ( 8)[Li]
0091 getlocal_WC_0 lines@0
0093 opt_send_without_block <calldata!mid:puts, argc:1, FCALL|ARGS_SIMPLE>
0095 leave ( 9)[Re]
```
Works like a charm without `=> lines`
--
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