Hi Charlie,
I see; it works. What is the best forum for feedback?
For starters, it took me a minute to understand that void is used as a
method return type, but is left out as a method argument. This is no problem
as long as it is stated somewhere in block letters (avoiding the words large
type here).
Let me know if it is this forum or somewhere else.
Thanks for the tool and your help,
best regards,
René.
On Tue, Oct 14, 2008 at 1:19 PM, Charles Oliver Nutter <
[EMAIL PROTECTED]> wrote:
>
> I need to provide some better examples, but the missing bit of code is
> generating the class files after you've done the building process:
>
> builder.generate do |filename, class_builder|
> File.open(filename, 'w') {|f| f.write(class_builder.generate)}
> end
>
> The generate method on the main builder passes the .class filename and
> the ClassBuilder for each class. ClassBuilder#generate produces the
> bytes for the class.
>
> Note that I've never released JVMScript officially, but I want to; if
> you start playing around with it, keep in mind the following:
>
> 1. I'm interested in input and willing to make changes before doing a
> release
> 2. The Compiler namespace will probably become JVMScript
>
> So a shorter, more complete example:
>
> ~/projects/duby ➔ cat simple.rb
> require 'jvmscript'
>
> builder = Compiler::FileBuilder.build('simple.source') do
> public_class 'simple', object do
> public_static_method 'main', void, string[] do
> aload 0
> ldc_int 0
> aaload
> aprintln
> end
> end
> end
>
> builder.generate do |file, cls|
> File.open(file, 'w') {|f| f.write(cls.generate)}
> end
>
> ~/projects/duby ➔ jruby -I ../jvmscript/lib simple.rb
>
> ~/projects/duby ➔ javap -c simple
> Compiled from "simple.source"
> public class simple extends java.lang.Object{
> public static void main(java.lang.String[]);
> Code:
> 0: aload_0
> 1: ldc #8; //int 0
> 3: aaload
> 4: dup
> 5: getstatic #14; //Field
> java/lang/System.out:Ljava/io/PrintStream;
> 8: swap
> 9: invokevirtual #20; //Method
> java/io/PrintStream.println:(Ljava/lang/Object;)V
>
> }
>
> - Charlie
>
> René Jansen wrote:
> > Hi Charlie,
> >
> > thanks for sharing this, it looks most useful. I downloaded and ran it;
> > the testcases run ok. I cannot figure out how to make it write
> > MyClass.class; please forgive me my Ruby-ignorance here. I removed the
> > things I though to be for the testcase only, and have it execute outside
> > of a method. It executes ok, but Erik Meijer would be very happy: there
> > are no side-effects. That I know of.
> >
> > best regards and thanks in advance.
> >
> > René.
> >
> > On Fri, Oct 10, 2008 at 7:58 PM, Charles Oliver Nutter
> > <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> wrote:
> >
> >
> > René Jansen wrote:
> > > Just a quick question: which assembler are you guys using for
> > > experimentation? I find myself wanting to try out some things,
> > but I am
> > > in a bind between ooLong and Jasmin or maybe ASM. Is there an
> > unofficial
> > > official assembler, preferably something with macros (old s/370
> bal
> > > programmer that I am) and its own disassembler.
> > >
> > > I noticed there is a class called Assembler in the tools sources,
> is
> > > this only usable from javac or is it addressable in any other way?
> > >
> > > If no disassembler goes with the package, I would prefer
> > something that
> > > is close enough to javap that I can write a small thingy to
> rearrange
> > > its output into something that I can assemble - something that
> > ASM can
> > > but in a very verbose way.
> > >
> > > Please let me know what you use.
> >
> > I'm using ASM exclusively, but usually wrapped behind one of my own
> > shims.
> >
> > Either this super-trivial shim that just exposes a method-per-opcode:
> >
> > http://is.gd/3RsP
> >
> > Or my unreleased Ruby DSL for ASM, "JVMScript":
> >
> > http://kenai.com/projects/jvmscript
> >
> > The latter is probably more interesting to you, but obviously has a
> > dependency on JRuby. Perhaps that's not a problem for your toolchain.
> >
> > Here's a short sample:
> >
> > builder = Compiler::FileBuilder.build("somefile.source") do
> > package "org.awesome", "stuff" do
> > public_class "MyClass", object do
> > public_field "list", ArrayList
> >
> > public_constructor string, ArrayList do
> > aload 0
> > invokespecial object, "<init>", [void]
> > aload 0
> > aload 1
> > aload 2
> > invokevirtual this, "bar", [ArrayList, string, ArrayList]
> > aload 0
> > swap
> > putfield this, "list", ArrayList
> > returnvoid
> > end
> >
> > public_static_method "foo", this, string do
> > new this
> > dup
> > aload 0
> > new ArrayList
> > dup
> > invokespecial ArrayList, "<init>", [void]
> > invokespecial this, "<init>", [void, string, ArrayList]
> > areturn
> > end
> >
> > public_method "bar", ArrayList, string, ArrayList do
> > aload 1
> > invokevirtual(string, "toLowerCase", string)
> > aload 2
> > swap
> > invokevirtual(ArrayList, "add", [boolean, object])
> > aload 2
> > areturn
> > end
> >
> > public_method("getList", ArrayList) do
> > aload 0
> > getfield this, "list", ArrayList
> > areturn
> > end
> >
> > public_static_method("main", void, string[]) do
> > aload 0
> > ldc_int 0
> > aaload
> > invokestatic this, "foo", [this, string]
> > invokevirtual this, "getList", ArrayList
> > aprintln
> > returnvoid
> > end
> > end
> > end
> > end
> >
> > - Charlie
> >
> >
> >
> >
> >
> > >
>
>
>
> >
>
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