Subject:
Embedding the shell
Date:
Wed, 8 Sep 1999 16:01:44 -0400
From:
"Kurt Westerfeld" <kurt@westerfeld.com>
To:
"Norris Boyd" <norris@netscape.com>
Norris, please find the attached zip file containing the (minor)
modifications to the Rhino shell module that enables the shell to be
embedded in a host application.
There are two areas of change to be concerned about:
1. Any and all references to System.in/out/err have been modified to use
Main.in/out/err, which default to System.in/out/err. Methods to do a setIn,
setOut, and setErr were added. Note that in/out/err on Main were made
static public, so that the jikes compiler wouldn't complain (I had them as
static protected, but when accessed outside of the package, a warning was
issued).
2. The global and sharedGlobal static variables were made protected so
that my app can make use of them (to add extensions after an initial pass
through main()).
That's it.
I have successfully used the facility to drop a remote telnet server into
the shell interpreter, effectively giving our server a remote shell
interpreter. It's quite nice, as we have a lot of extensions to Rhino
written that blend into our server already.
PS, I am still working on the array issues, but made a lot of progress
today. I just wanted to get this stuff off my desk.
Thanks!
________________________________________________________________________
Kurt Westerfeld
Managed Object Solutions
2722 Merrilee Drive
Suite 350
Fairfax, VA 22031
Phone: 703.208.3330 x225
Fax: 703.208.3331
http://www.mosol.com
mailto:kurt@mosol.com
shell.zip
Name:
shell.zip
Type:
Zip Compressed Data (application/x-zip-compressed)
Encoding:
base64
==============================================================================
Subject:
Rhino Array Source (Fixed)
Date:
Thu, 9 Sep 1999 14:12:03 -0400
From:
"Kurt Westerfeld" <kurt@mosol.com>
To:
"Norris Boyd" <norris@netscape.com>
Attached is NativeJavaObject.java, which seems to now pass the tests supplied to me by you and Scott. Not a lot of change, but a lot of
testing and thinking was involved. <g>
PS. I also fixed a bug in reportConversionError() which was throwing an IllegalArgumentException inside of the MessageFormat class at times.
It also looks a little nicer (uses formatting from NativeJavaMethod) and closer to the C implementation.
NativeJavaObject.java
Name:
NativeJavaObject.java
Type:
Java Source File (text/java)
Encoding:
quoted-printable
- Added support for reflecting interface constants as Components.interfaces.nsIFoo.* (this may change).
- Only interfaces marked 'scriptable' are visible in the Components.interfaces array.
- Getting rid of some of the template style syntax.
- Added GetWStringCopied and GetWStringShared for lame tests of speed in wstring copies.
- Cleaned up more Unix warnings.
- Throw nsIXPCException objects rather than strings into JS.
- Better and more information in exceptions - including names of result codes and call stack.
- Added nsIJSErrorReport as attachment to exceptions for JS errors.
- Exceptions thrown in JS now get properly translated into result codes.
- Exceptions thrown JS->native->JS get propagated.
- Added per thread nsIXPConnect::[G,S]etPendingException.
- Added XPCConvert::JSValToXPCException - still needs better handling JS exception objects.
- Added XPCConvert::JSErrorToXPCException.
- No longer eat JS errrors in wrapped JS code called from native code.
- Declare xpconnect result codes in nsIXPConnect.h.
- Changed format of xpc.msg to give error names and descriptions.
- Fixed extraneous semicolons on XPC_IMPLEMENT_* macro usage.
- Using NS_IMPL_ISUPPORTS2 for nsIXPCScriptable declarations.
- Improve refcounting in xpccomponents.
- Turned some common code into macros.
- Converting some interfaces to use mccabe's NS_IMPL_* macros.
- Cleanup lots of trailing whitespace.
- Fixed idl comments.
# The contents of this file are subject to the Netscape Public License
# Version 1.0 (the "NPL"); you may not use this file except in
# compliance with the NPL. You may obtain a copy of the NPL at
# http://www.mozilla.org/NPL/
#
# Software distributed under the NPL is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
# for the specific language governing rights and limitations under the
# NPL.
#
# The Initial Developer of this code under the NPL is Netscape
# Communications Corporation. Portions created by Netscape are
# Copyright (C) 1998 Netscape Communications Corporation. All Rights
# Reserved.
#
DEPTH = ../../../..
topsrcdir = @top_srcdir@
srcdir = @srcdir@
VPATH = @srcdir@
include $(DEPTH)/config/autoconf.mk
LIBRARY_NAME = xpconnect
MODULE = xpconnect
CPPSRCS = \
nsXPConnect.cpp \
xpcarbitrary.cpp \
xpccomponents.cpp \
xpccontext.cpp \
xpcconvert.cpp \
xpcjsid.cpp \
xpclog.cpp \
xpcmaps.cpp \
xpcmodule.cpp \
xpcstack.cpp \
xpcthreadcontext.cpp \
xpcthrower.cpp \
xpcwrappedjs.cpp \
xpcwrappedjsclass.cpp \
xpcwrappednative.cpp \
xpcwrappednativeclass.cpp \
xpcwrappednativejsops.cpp \
$(NULL)
include $(topsrcdir)/config/config.mk
# XXX hackage!
# only copy the .so to components dir on platforms where xptcall is supported
# Unixish x86
ifneq (,$(filter SunOS Linux FreeBSD NetBSD BSD_OS,$(OS_ARCH)))
ifeq (86,$(findstring 86,$(OS_TEST)))
IS_COMPONENT = 1
endif
endif
# Neutrino Cross-Compiled for x86
ifneq (,$(filter NTO,$(OS_TARGET)))
ifeq (86,$(findstring 86,$(OS_TEST)))
IS_COMPONENT = 1
endif
endif
# Solaris/sparc
ifeq ($(OS_ARCH),SunOS)
ifneq (86,$(findstring 86,$(OS_TEST)))
IS_COMPONENT = 1
endif
endif
# Linux/sparc
ifeq ($(OS_ARCH),Linux)
ifeq ($(OS_TEST),sparc)
IS_COMPONENT = 1
endif
endif
# NetBSD/m68k
ifeq ($(OS_ARCH),NetBSD)
ifneq (,$(filter amiga atari hp300 mac68k mvme68k next68k sun3 sun3x x68k,$(OS_TEST)))
IS_COMPONENT = 1
endif
endif
# BeOS/Intel
ifeq ($(OS_ARCH),BeOS)
ifeq ($(OS_TEST),BePC)
IS_COMPONENT = 1
endif
endif
# HPUX
ifeq ($(OS_ARCH),HP-UX)
ifneq ($(CC),gcc)
IS_COMPONENT = 1
endif
endif
# AIX
ifeq ($(OS_ARCH),AIX)
IS_COMPONENT = 1
endif
# IRIX
ifeq ($(OS_ARCH),IRIX)
ifneq ($(basename $(OS_RELEASE)),5)
IS_COMPONENT = 1
endif
endif
# OpenVMS (Alpha only at this point)
ifeq ($(OS_ARCH),OpenVMS)
ifeq ($(CPU_ARCH),Alpha)
IS_COMPONENT = 1
endif
endif
# Linux or NetBSD ARM
ifneq (,$(filter Linux NetBSD,$(OS_ARCH)))
ifeq (arm,$(findstring arm,$(OS_TEST)))
IS_COMPONENT = 1
endif
ifeq (sa110,$(findstring sa110,$(OS_TEST)))
IS_COMPONENT = 1
endif
endif
include $(topsrcdir)/config/rules.mk
# this is automatically discovered under BeOS
ifneq ($(OS_ARCH),BeOS)
LIBS += \
-lmozjs \
-lxpcom \
-lmozreg \
$(NSPR_LIBS) \
$(NULL)
endif
DEFINES += -DJSFILE -DJS_THREADSAFE
The fix sort of works. But there are some new problems. I enclosed two JavaScript files, button.js and image.js.
If I load button.js first and then image.js, I got the following:
js> load("button.js");
js> load("image.js");
Ambiguous import: [JavaClass javax.swing.ImageIcon] and [JavaClass javax.swing.ImageIcon]
js> load("image.js");
Ambiguous import: [JavaClass java.net.URL] and [JavaClass java.net.URL]
js> load("image.js");
Ambiguous import: [JavaClass java.lang.System] and [JavaClass java.lang.System]
js> load("image.js");
loadImage for 0
Ambiguous import: [JavaClass java.awt.Toolkit] and [JavaClass java.awt.Toolkit]
js> load("image.js");
loadImage for 0
js>
If I load imag.js first and then button.js, I got the following:
js> load("image.js");
loadImage for 0
js: [JavaPackage java.lang.URL] is not a function.
[JavaPackage java.lang.URL] is not a function.
js> load("image.js");
js: [JavaPackage java.lang.ImageIcon] is not a function.
[JavaPackage java.lang.ImageIcon] is not a function.
js> load("image.js");
js: [JavaPackage java.lang.ImageIcon] is not a function.
[JavaPackage java.lang.ImageIcon] is not a function.
js> load("image.js");
js: [JavaPackage java.lang.ImageIcon] is not a function.
[JavaPackage java.lang.ImageIcon] is not a function.
js> load("button.js");
js: [JavaPackage java.lang.JButton] is not a function.
[JavaPackage java.lang.JButton] is not a function.
js> load("button.js");
js: [JavaPackage java.lang.JButton] is not a function.
[JavaPackage java.lang.JButton] is not a function.
js> load("image.js");
js: [JavaPackage java.lang.ImageIcon] is not a function.
[JavaPackage java.lang.ImageIcon] is not a function.
js>
It looks like something wrong in the image.js file but this should not interfere with button.js. It looks like some arbitary package objects are created, like java.lang.URL. This happened in NativeJavaPackage.get method. If a class of java.lang.URL is not found, a package object is then created. So next time the interpreter encounters URL, it somehow uses the object java.lang.URL instead of the correct class object java.net.URL.. This is one problem. The interference between button.js and jmage.js is another problem.
Howard
----- Original Message -----
From: Norris Boyd
To: \ Howard\\ Xuhua Lin
Sent: Thursday, August 12, 1999 12:58 PM
Subject: Re: ImporterTopLevel problem
Sorry I've been slow. I finished up the fix this morning and have posted it on the ftp site and checked into cvs.
Let me know if it works for you.
--Norris
\"Howard\" Xuhua Lin wrote:
Hi, Norris, what's the status of the ImporterTopeLevel problem (i.e if you use importPackage twice, you will get an "Ambiguous import" exception)? Are you still working on it? Howard
Subject:
ImporterTopLevel problem
Date:
Fri, 6 Aug 1999 15:42:50 -0400
From:
"\"Howard\" Xuhua Lin" <howard@softcom.com>
To:
"Norris Boyd" <norris@netscape.com>
CC:
"Andrew Wason" <aw@softcom.com>
Hi, The following script will cause an EvaluatorException: Ambiguous import: [JavaPackage java.awt.JButton] and [JavaPackage
java.awt.Packages.javax.swing.JButton] in the js shell:
js>importPackage(java.awt);
js>importPackage(Packages.javax.swing);
js>new JButton();.
The current JS shell will not print this exception message, even though the comment says "// Already printed message, so just fall
through". I add System.err.println(ee.getMessage()); for this exception.
The problem is that in NativeJavaPackage.get(String, Scriptable) method, if a ClassNotFoundException is caught, a
NativeJavaPackage object is created and passed back to ImporterTopLevel.get Method. So in ImporterTopLevel.get method, object v
is always not NOT_FOUND and the ambiguous exception will be thrown. Object v is supposed to be a Class object but it actually is
a Package object.
The fix can be either (1) in NativeJavaPackage.get(String, Scriptable) method, if a ClassNotFoundException is caught, return a
NOT_FOUND object (you may still create a Package object) or (2) in ImporterTopLevel.get method, make sure the returned object
from NativeJavaPackage.get method is of NativeJavaClass type.
Howard
Error if an interface is declared [scriptable], but contains methods that can't be scripted because they refer to native-declared types, unless the method is declared [noscript].
This change is intended to make it easier to determine when an interface is not scriptable, and to make it easier to see what changes need to be made to make it scriptable.
As many of the .idl files in the tree defined [scriptable] interfaces that contained non-scriptable methods, I've sprinkled [noscript] throughout. As the interfaces weren't scriptable anyway, this shouldn't change their visibility to javascript.
Subject:
reflection and illegal package access
Date:
Wed, 04 Aug 1999 21:56:20 -0400
From:
Andrew Wason <aw@softcom.com>
To:
norris@netscape.com (Norris Boyd)
CC:
Howard Lin <howard@softcom.com>
If you run Rhino under JDK1.2 with a security manager:
java -Djava.security.manager=java.lang.SecurityManager
org.mozilla.javascript.tools.shell.Main
Then reflection fails for objects that are in a restricted access package
(e.g. sun.*). Rhino is reflecting based on the dynamic type of the object
instead of the declared static return type.
In this example, createImage is declared to return java.awt.Image, but it
returns sun.awt.image.OffScreenImage. Attempting to reflect this class
results in a java.security.AccessControlException for
java.lang.RuntimePermission accessClassInPackage.sun.awt.image.
Here is the script. You will need to type it in because you won't be able
to load it from a file due to the security manager.
var f = new java.awt.Frame();
f.setVisible(true);
var i = f.createImage(10,10);
Subject:
null arguments
Date:
Wed, 04 Aug 1999 13:22:35 -0400
From:
Andrew Wason <aw@softcom.com>
To:
norris@netscape.com
CC:
Howard Lin <howard@softcom.com>
When I try to pass a null argument to an interface implemented in JS, I get:
js: Cannot convert null to an object.
js: uncaught JavaScript exception:
org.mozilla.javascript.EvaluatorException: Cannot convert null to an object.
var b = new Packages.javax.swing.border.Border() {
getBorderInsets : function(c) {
return new Insets(0,0,0,0);
}
};
b.getBorderInsets(null);
Here is the stack trace where the exception is happening:
java.lang.reflect.InvocationTargetException:
org.mozilla.javascript.EvaluatorException: Cannot convert null to an object.
at
org.mozilla.javascript.tools.ToolErrorReporter.runtimeError(ToolErrorReporte
r.java:106)
at org.mozilla.javascript.Context.reportRuntimeError(Context.java:484)
at org.mozilla.javascript.Context.reportRuntimeError(Context.java:500)
at
org.mozilla.javascript.ScriptRuntime.toObject(ScriptRuntime.java:529)
at org.mozilla.javascript.Context.toObject(Context.java:1107)
at adapter0.getBorderInsets(<adapter>)
at java.lang.reflect.Method.invoke(Native Method)
at
org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java,
Compiled Code)
at org.mozilla.javascript.ScriptRuntime.call(ScriptRuntime.java:1256)
at org.mozilla.javascript.Interpreter.interpret(Interpreter.java,
Compiled Code)
at
org.mozilla.javascript.InterpretedScript.call(InterpretedScript.java:49)
at
org.mozilla.javascript.InterpretedScript.exec(InterpretedScript.java:37)
at org.mozilla.javascript.Context.evaluateReader(Context.java:691)
at
org.mozilla.javascript.tools.shell.Main.processSource(Main.java, Compiled Code)
at org.mozilla.javascript.tools.shell.Main.main(Main.java:146)
Context.toObject does not allow wrapping nulls.
JavaAdapter.generateOverride should generate bytecode to check if an
argument is null and if it is not call Context.toObject.
I'll take a look at fixing this after the other JavaAdapter patches get
checked in so we don't get out of sync.
Andrew
--
Andrew Wason
SoftCom, Inc.
aw@softcom.com
* Accept patch from Andrew Wason <aw@softcom.com>:
Subject:
Re: partial interface problem
Date:
Wed, 04 Aug 1999 13:04:37 -0400
From:
Andrew Wason <aw@softcom.com>
To:
norris@netscape.com
CC:
Howard Lin <howard@softcom.com>
>I'm having a problem implementing a Java interface in JS where I don't
>implement all the methods, and one of the methods I don't define returns
>non-void.
I have a patch for this. I generate bytecode in
JavaAdapter.generateReturnResult to check the return type on the stack from
JavaAdapter.callMethod. If it is Undefined, return null.
I'm not positive this is the right way to fix this - maybe it should be
fixed closer to the source (e.g. prevent callMethod from returning
Undefined to begin with)
Andrew
--
Andrew Wason
SoftCom, Inc.
aw@softcom.com
Subject:
default JavaAdapter patch
Date:
Tue, 20 Jul 1999 15:35:01 -0400
From:
Andrew Wason <aw@softcom.com>
To:
norris@netscape.com
CC:
mccabe@netscape.com, rogerl@netscape.com
Attached is a patch to the patch I sent a while ago for the JavaAdapter stuff.
If a SecurityManager is installed, attempting to access the
"org.mozilla.javascript.JavaAdapter" system property can throw a
SecurityException. This should not prevent the default JavaAdapter
implementation from being used.
Andrew
--
Andrew Wason
SoftCom, Inc.
aw@softcom.com
Subject:
Rhino reflection patch
Date:
Wed, 28 Jul 1999 18:14:52 -0400
From:
Andrew Wason <aw@softcom.com>
To:
norris@netscape.com
CC:
mccabe@netscape.com, rogerl@netscape.com, Howard Lin <howard@softcom.com>
When JavaAdapter generates an adapter class, it does not take into account
the types of method parameters when wrapping the generated methods arguments.
This means that if a non-public class implements a public interface the
non-public class type will be wrapped instead of the declared public
interface - and methods cannot be invoked via the wrapper.
I have attached sample code (reflect-demo.zip) which shows this. The
JavaScript caller.js generates an adapter implementing the CallerInterface
interface. CallerInterface has a method (doSomething) which takes an
argument of type pkg.Interface. pkg.Target is a non-public class that
implements pkg.Interface. If an instance of pkg.Target is passed to the
CallerInterface adapter doSomething method, an Error is thrown because
pkg.Target.doSomething is called (instead of pkg.Interface.doSomething) and
pkg.Target is not public.
I have attached a patch to Context.java, ScriptRuntime.java and
JavaAdapter.java. I overloaded toObject in Context and ScriptRuntime to
take a 3rd argument which is the declared type of the object being
wrapped. This is passed to NativeJavaObject.wrap so that it generates the
correct wrapper. I changed JavaAdapter.generateOverride to generate
bytecode calling Context.toObject passing the declared Class type of the
argument.
Context.java also includes my previously submitted patch for dealing with
SecurityExceptions and the JavaAdapter property (because this patch has not
been checked into CVS yet).
Andrew
--
Andrew Wason
SoftCom, Inc.
aw@softcom.com
reflect-patch.txt
Name:
reflect-patch.txt
Type:
Plain Text (text/plain)
reflect-demo.zip
Name:
reflect-demo.zip
Type:
Zip Compressed Data (application/x-zip-compressed)
Encoding:
base64
2) add a test that acts as a sample for doing oberloaded methods on xpconnect wraped natives.
3) add a NOT_IMPLEMENTED method to wrapped native for getting the prototype JS object.
4) Set the global object of the JSContext as the wrapped native JSObject's parent when creating this JSObject. This makes JS code compiled against the wrapper actuall work!
5) fix the refcounting on factories in the tests/components module
Thanks go to Andrew Wason <aw@softcom.com> for finding this problem and providing the patch:
If we implement a Java interface in JavaScript, and a method in that interface returns a Java object, we get a java.lang.IncompatibleClassChangeError: org/mozilla/javascript/Wrapper exception.
We have attached a sample JavaScript file which duplicates the error.
The problem is JavaAdapter is generating an INVOKEVIRTUAL bytecode to call Wrapper.unwrap, but Wrapper is an interface and so INVOKEINTERFACE should be used instead. As a result of this change, the IFEQ bytecode generated needs to jump more bytes. We have attached a patch that fixes the problem.
Andrew
--
Andrew Wason
SoftCom, Inc.
aw@softcom.com
- normalized initial MPL comment to match the format of others in the tree, including an initial -*- Mode line.
- removed RCS $log$, etc. comments. We use CVS, and they just make spurious changes...
- js_DecompileValueGenerator had rusted due to bytecode/source-note changes,
or maybe parts of it never worked right. Anyway, it now does not induce a
crashing underflow in the decompiler. As part of this fix, it now takes a
checkStack flag telling whether to look for the jsval v argument on the JS
stack. The calls from ImportProperty, js_SetProperty, and js_DeleteProperty
pass in v a jsval for the property id, which should not be sought after on
the stack (it might happen to be there due to o['p'] = 2, but we want to
decompile o["p"], not "p").
- js_DecompileValueGenerator would load a generating pc even if the value v
did not match the pc's corresponding stack item! Oops. This lead to less
than idea diagnostics.
- js_DecompileValueGenerator was also not mapping JSOP_TRAP to the real op at
a sufficiently early and univeral point in its control flow.
- Fix PopOff to assert and check for stack underflow in the decompiler, and
beef up PushOff too (it asserted, but did not check).
- js_ReportIsNotFunction now avoids JS_InternString by indexing directly into
cx->runtime->atomState.typeAtoms with the result of JS_TypeOfValue.
- Removed unnecessary local GC root reserved by non-zero trailing member of
obj_eval's JSFunctionSpec initializer.
Add an #if defined(__arm) check to tell jsdtoa.c about the (somewhat bizzare) endian-ness of the ARM architecture.
Thanks go to Stefan Hanske <sh990154@mail.uni-greifswald.de> for this fix.
2) rooted out all instances of JS_ReportErros and replaced with JS exception throwing.
3) added more exception message types.
4) Added service (also reflected into JS) for getting JS and native stack objects to be used in exceptions.
5) Fixed broken test.
6) updated TODO list.
to define an unbound global variable used to enumerate an empty object, when
the standard says no variable should be defined.
- Clean up minor nits, make comment style match prevailing, tighten up for..in
element-indexing special case comments.
- Fix js_Invoke to take CONSTRUCT and INTERNAL flags arg instead of a construct
boolean arg and the JSStackFrame internalCall mis-located boolean non-arg.
Use these flags correctly in all calls (previous version failed to set the
bogus frame.internalCall around js_Invoke calls from jsfun.c and jsstr.c).
2) make the wrappedJS QI check for a match with chained wrappers before trying QI on the wrapped JS object.
3) add support for brendan's new JSArgumentFormatter callback to do auto js arg conversions - with test.
- Fix js_GetAtom fallibility by returning &dummy on assert-botch "can't happen"
index out of range case.
- js_InitAtomMap needn't bother nulling ale->next with tmp save
- js_InitAtomState explicit tail fusion for FROB via goto bad, and early memset
(I know, JSRuntime is cleared already and it contains the atom state ... but
jsatom.c doesn't know that).
- Clear all ATOM_ flags save ATOM_PINNED when creating a new atom.
- Cleanup xtra, ALIGNNUM, etc. useless variables, use JSVAL_ALIGN and JS_MAX.
Despite my stupidity here, I must say that over-includers elsewhere of both
jspubtd.h and jsapi.h, and even jscntxt.h, with system headers intermixed, suck
a lot too.
"external" calls compiled from scripts, which have stack budget depth slots
under the return value slot for the call expression's generating pc.
- New internalCall packed boolean flag in JSStackFrame to distinguish callers
of js_InternalCall so the generating pc isn't mistakenly stored depth slots
below stack space allocated on-the-fly for internal call args/rval.
- Fixed bugzilla bug 8042, finally by storing the call expression's generating
pc -- but only for external calls.
- Whitespace policing, gratuitous parenthesization reduction, etc.
2) breakout js ops into their own file so that the flattening project is less complicated
3) add a noisy object to the test components - this object prints addrefs, release, QIs, ctor, and dtor. This is useful for refcounting tests.
4) cleanup some component registration stuff.
Support for jsGet_ and jsSet_ prefixes to methods for explicit getter
and setter definition.
Addition of "importClass" and "importPackage" top-level functions.
The beginnings of a history object accessible from the shell.
rogerl%netscape.com
cls%seawood.org
jband%netscape.com
briano%netscape.com
norris%netscape.com
mccabe%netscape.com
slamm%netscape.com
shaver%netscape.com
toshok%hungry.com
brendan%mozilla.org
beard%netscape.com
fur%netscape.com
mcafee%netscape.com
cyeh%netscape.com
ramiro%netscape.com
brade%netscape.com
mgleeson1%netscape.com
tbogard%aol.net
waldemar%netscape.com
cbegle%netscape.com
Jerry.Kirk%Nexwarecorp.com
jdunn%netscape.com
sspitzer%netscape.com
dveditz%netscape.com
scc%netscape.com
brendan%netscape.com
dp%netscape.com