From: Per Bothner <per@bothner.com>
To: Kay Zheng <l04m33@gmail.com>, Kawa mailing list <kawa@sourceware.org>
Subject: Re: The "--no-inline" option caused Kawa to generate invalid bytecode
Date: Tue, 05 Sep 2017 03:28:00 -0000 [thread overview]
Message-ID: <471ca916-1ba1-6ed4-4ff6-0966da00c7cc@bothner.com> (raw)
In-Reply-To: <CAJCc8OwD+ea+e29=dPhGoZ9W8fZms_i-aOOLcxHrKgPZYANyrg@mail.gmail.com>
On 09/04/2017 03:25 AM, Kay Zheng wrote:
> Hi Per,
>
> I think I hit a bug regarding "(define-early-constant ...)" and the
> "--no-inline" option.
I was able to reproduce the problem.
> I then disassembled kawa-test.class (the result is appended at the end
> of this email), and found that there was a "aload_0" instruction in
> the static initialization block. I'm not familiar with the JVM, but
> search results said the instruction was to read the argument array,
> yet there was no argument list for the static initialization block at
> all.
aload_0 does not necessarily means to read the argument array.
It means to push the contents of local variable 0 (which must
be a reference to an object or null) onto the operand stack.
The first few local variables are commonly used for parameters,
but <clinit> takes no parameters, not even the implicit 'this'.
In this case I'm guessing a bug in the Compilation.loadCallContext method.
--
--Per Bothner
per@bothner.com http://per.bothner.com/
next prev parent reply other threads:[~2017-09-05 3:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-04 10:25 Kay Zheng
2017-09-05 3:28 ` Per Bothner [this message]
2017-09-05 16:51 ` Kay Zheng
2017-10-05 6:29 ` Per Bothner
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