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Bug #16161
closedtailcall_optimization may be disabled after r67315
ruby -v:
ruby 2.7.0dev (2019-09-09T23:18:03Z master 3678c37119) [x86_64-linux]
Backport:
Description
Before r67315:
$ ./miniruby -v -e 'iseq = RubyVM::InstructionSequence.compile("def foo(n, s = 0);return s if n < 1;foo(n - 1, n + s); end", tailcall_optimization: true); iseq.eval; p foo(900_000)'
ruby 2.7.0dev (2019-03-20 trunk 67314) [x86_64-linux]
405000450000
After r67315:
$ ./miniruby -v -e 'iseq = RubyVM::InstructionSequence.compile("def foo(n, s = 0);return s if n < 1;foo(n - 1, n + s); end", tailcall_optimization: true); iseq.eval; p foo(900_000)'
ruby 2.7.0dev (2019-03-20 trunk 67315) [x86_64-linux]
Traceback (most recent call last):
10080: from -e:1:in `<main>'
10079: from <compiled>:1:in `foo'
10078: from <compiled>:1:in `foo'
10077: from <compiled>:1:in `foo'
10076: from <compiled>:1:in `foo'
10075: from <compiled>:1:in `foo'
10074: from <compiled>:1:in `foo'
10073: from <compiled>:1:in `foo'
... 10068 levels...
4: from <compiled>:1:in `foo'
3: from <compiled>:1:in `foo'
2: from <compiled>:1:in `foo'
1: from <compiled>:1:in `foo'
<compiled>:1:in `foo': stack level too deep (SystemStackError)
master:
$ ./miniruby -v -e 'iseq = RubyVM::InstructionSequence.compile("def foo(n, s = 0);return s if n < 1;foo(n - 1, n + s); end", tailcall_optimization: true); iseq.eval; p foo(900_000)'
ruby 2.7.0dev (2019-09-09T23:18:03Z master 3678c37119) [x86_64-linux]
Traceback (most recent call last):
10080: from -e:1:in `<main>'
10079: from <compiled>:1:in `foo'
10078: from <compiled>:1:in `foo'
10077: from <compiled>:1:in `foo'
10076: from <compiled>:1:in `foo'
10075: from <compiled>:1:in `foo'
10074: from <compiled>:1:in `foo'
10073: from <compiled>:1:in `foo'
... 10068 levels...
4: from <compiled>:1:in `foo'
3: from <compiled>:1:in `foo'
2: from <compiled>:1:in `foo'
1: from <compiled>:1:in `foo'
<compiled>:1:in `foo': stack level too deep (SystemStackError)
I think ruby should not raise SystemStackError with tailcall_optimization, should it?
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