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New Post: writing an expression to disk

billchi — Sun, 22 Nov 2009 22:09:08 GMT

The only support we have is if you have a LambdaExpr, and you pass a MethodBuilder to Compile. It is up to the caller to create the assembly, save it to disk, etc. IronPython does this if you want to see how they use it.

Bill

From: CodeMoniker [mailto:notifications@codeplex.com]
Sent: Sunday, November 22, 2009 2:06 PM
To: Bill Chiles
Subject: writing an expression to disk [dlr:75885]

From: CodeMoniker

Is it possible to write a Microsoft.Scripting.Ast.Expression to disk as IL code so that it can be executed later? It is actually an ExpressionBlock, but I could change this if need be.

I found this post:

http://dlr.codeplex.com/Thread/View.aspx?ThreadId=48559

This involved ScriptCode.SaveToAssembly. I couldn't figure out how to get that to work with just an Expression.

thanks in advance

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New Post: writing an expression to disk

CodeMoniker — Sun, 22 Nov 2009 22:06:08 GMT

Is it possible to write a Microsoft.Scripting.Ast.Expression to disk as IL code so that it can be executed later? It is actually an ExpressionBlock, but I could change this if need be.

I found this post:

http://dlr.codeplex.com/Thread/View.aspx?ThreadId=48559

This involved ScriptCode.SaveToAssembly. I couldn't figure out how to get that to work with just an Expression.

thanks in advance

New Post: Cannot compile with WPF

tomix1980 — Sat, 21 Nov 2009 07:49:49 GMT

Hi,

As soon as adding a new WPF project to the solution of DLR i am geeting alot of errors

Error 1 Friend access was granted to 'System.Core, PublicKey=00000000000000000400000000000000', but the output assembly is named 'System.Core, Version=0.9.6.20, Culture=neutral, PublicKeyToken=null'. Try adding a reference to 'System.Core, PublicKey=00000000000000000400000000000000' or changing the output assembly name to match.

Error 2 Warning as Error: The predefined type 'System.Linq.Expressions.ElementInit' is defined in multiple assemblies in the global alias; using definition from 'C:\DLR-0.92-Src\Codeplex-DLR-0.92\Src\Runtime\Microsoft.Scripting.Core\Ast\ElementInit.cs'

I am using VS.NET 2010 Beta2

Thanks in advance

New Post: Invoke Exception in Mono

ibluesun — Thu, 19 Nov 2009 19:08:36 GMT

The visibility of the class is public

the visibility of the FunctionDelegate Property is private {But I tested it with public visibility and it was the same error} (in fact it is running under .net framework without errors but not in Mono )

here is a snippet of the code

    internal System.Delegate _FunctionDelegate;

        private Func<QsValue> FunctionDelegate_0
        {
            get
            {
                return (Func<QsValue>)_FunctionDelegate;
            }
        }

        private Func<QsParameter, QsValue> FunctionDelegate_1
        {
            get
            {
                return (Func<QsParameter, QsValue>)_FunctionDelegate;
            }
        }

New Post: Invoke Exception in Mono

TomasMatousek — Thu, 19 Nov 2009 18:06:19 GMT

What is the visibility of the property Qs.Runtime.QsFunction:FunctionDelegate? Is the getter public? Is QsFunction class public?

New Post: Invoke Exception in Mono

ibluesun — Thu, 19 Nov 2009 12:45:02 GMT

Hello

in my QuantitySystem project

I have a strange exception when evaluating expression in Mono (which I really I don't know if it is related to the DLR or the mono implementation) :(

Exception:

MethodAccessException: Method `Qs.Runtime.QsFunction:get_FunctionDelegate_1 ()' is inaccessible from method `(wrapper dynamic-method) object:lambda_method (System.Runtime.CompilerServices.Closure)'

this happens when I make a call to evaluated function

Qs> f(x) = x^2
Qs> f(8)

The corresponding expression from the debug view when evaluating f(8) is:

.Invoke (.Constant(f(x) = x^2).FunctionDelegate_1)(.Try {
        .Call Qs.Runtime.QsParameter.MakeParameter(
            .Constant(DimensionlessQuantity: 8 <1>),
            "8")
    } .Catch (System.Exception) {
        .Call Qs.Runtime.QsParameter.MakeParameter(
            null,
            "8")
    })

I am storing the function expression and delegate in a QsFunction object and specify the required delegate (which is called by property) by the parameter numbers (this corresponds to .FunctionDelegate_1, _2, ..., _12 )

however If I made a sequence call (which is another conceptual object)

Qs> S[x] ..> x^2
Qs> S[8]

no error occur and the expression debug of S[8] is

Sequence Call:
.Call (.Call Qs.Runtime.QsSequence.GetSequence(
    .Constant(Microsoft.Scripting.Runtime.Scope),
    "",
    "f%1#0")).GetElementValue(8)

I figured out that the expression calls are different.

but I don't know if this is related to Mono or DLR

Thank you

Ahmed Sadek

QsException: Unhandled

MethodAccessException: Method `Qs.Runtime.QsFunction:get_FunctionDelegate_1 ()' is inaccessible from method `(wrapper dynamic-method) object:lambda_method (System.Runtime.CompilerServices.Closure)'QsException: Unhandled

MethodAccessException: Method `Qs.Runtime.QsFunction:get_FunctionDelegate_1 ()' is inaccessible from method `(wrapper dynamic-method) object:lambda_method (System.Runtime.CompilerServices.Closure)'

New Post: ForExpression

billchi — Wed, 18 Nov 2009 18:19:25 GMT

It will be a while before we add higher-level, reducible nodes for the loop constructs we planned. There might be an example of ForExpr in the ET spec on the codeplex site. Sorry for the teaser, but it will be quite a while before we add these nice to haves.

Cheers,

Bill

From: CodeMoniker [mailto:notifications@codeplex.com]
Sent: Wednesday, November 18, 2009 9:53 AM
To: Bill Chiles
Subject: ForExpression [dlr:75505]

From: CodeMoniker

I read in dlr-overview.doc that ForExpressions are not supported but that they will be on codeplex eventually.

What is the status on this? I just downloaded latest and didn't find anything. I could be looking in the wrong places though.

thanks for the help

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New Post: ForExpression

CodeMoniker — Wed, 18 Nov 2009 17:52:50 GMT

I read in dlr-overview.doc that ForExpressions are not supported but that they will be on codeplex eventually.

What is the status on this? I just downloaded latest and didn't find anything. I could be looking in the wrong places though.

thanks for the help

New Post: Dynamic operations can only be performed in homogenous AppDomain.

ktwoplex — Tue, 17 Nov 2009 20:40:56 GMT

This was related to an app.config option, I did not spend the time to isolate the exact one. However it's more than likely it's one that applies only to .net 4.

New Post: Dynamic operations can only be performed in homogenous AppDomain.

ktwoplex — Sun, 15 Nov 2009 03:52:47 GMT

I'm getting this exeption in my project, I've been following dlr for a while, so this was all a-ok until the latest ctp/beta/.net4b2 2010...

I built the dlr from source to get a bit more info, as the exception first occur's in system.core (A first chance exception of type 'System.InvalidOperationException' occurred in System.Core.dll), I also tried building the system.core included with the latest (I guess there will be a new build tomarrow) dlr, however it is missing several files (included at end of post);

After getting a PythonEngine, I'm trying to SetVariable('name", some.instance), which is where this exeption happens.

System.Core.dll!System.Runtime.CompilerServices.CallSiteBinder.BindCore<System.Func<System.Runtime.CompilerServices.CallSite,object,object,object>>(System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite,object,object,object>> site, object[] args) + 0x166 bytes
  System.Core.dll!System.Dynamic.UpdateDelegates.UpdateAndExecute2<object,object,object>(System.Runtime.CompilerServices.CallSite site = {System.Runtime.CompilerServices.CallSite<System.Func<System.Runtime.CompilerServices.CallSite,object,object,object>>}, object arg0 = {Microsoft.Scripting.Runtime.Scope}, object arg1 = {SO.RTL.LocalHDB}) + 0x29b bytes
  Microsoft.Scripting.dll!Microsoft.Scripting.Runtime.DynamicOperations.SetMember(object obj, string name, object value, bool ignoreCase) Line 216 + 0x11 bytes C#
  Microsoft.Scripting.dll!Microsoft.Scripting.Hosting.ObjectOperations.SetMember(object obj, string name, object value) Line 142 + 0x15 bytes C#
  Microsoft.Scripting.dll!Microsoft.Scripting.Hosting.ScriptScope.SetVariable(string name, object value) Line 122 + 0x1a bytes C#

I tried to find any other references, but the only place I found anything was in the source code for the DLR ;).

Also, can you remove the references to System.Data, they seem unused. Also, if possiable in the future, with your binary releases, would it make much sence to have a client profile targetted set of signed bits also?

(missing system.core files);

error CS1504: Source file 'C:\Users\files\Downloads\dlr-34591\DLR_Main\Src\Runtime\Microsoft.Scripting.Core\Ast\ExpressionWriter.cs' could not be opened ('Unspecified error ')
error CS1504: Source file 'C:\Users\files\Downloads\dlr-34591\DLR_Main\Src\Runtime\Microsoft.Scripting.Core\Actions\SmallRuleSet.cs' could not be opened ('Unspecified error ')
error CS1504: Source file 'C:\Users\files\Downloads\dlr-34591\DLR_Main\Src\Runtime\Microsoft.Scripting.Core\Ast\TreeComparer.cs' could not be opened ('Unspecified error ')
error CS1504: Source file 'C:\Users\files\Downloads\dlr-34591\DLR_Main\Src\Runtime\Microsoft.Scripting.Core\Actions\AutoRuleTemplate.cs' could not be opened ('Unspecified error ')
error CS1504: Source file 'C:\Users\files\Downloads\dlr-34591\DLR_Main\Src\Runtime\Microsoft.Scripting.Core\Compiler\ArgumentPrepender.cs' could not be opened ('Unspecified error ')
error CS1504: Source file 'C:\Users\files\Downloads\dlr-34591\DLR_Main\Src\Runtime\Microsoft.Scripting.Core\Utils\WeakUniqueSet.cs' could not be opened ('Unspecified error ')
error CS1504: Source file 'C:\Users\files\Downloads\dlr-34591\DLR_Main\Src\Runtime\Microsoft.Scripting.Core\Actions\CallSiteRule.cs' could not be opened ('Unspecified error ')

Thanks,

Shane

New Post: Hosting interface and multiple-file source

TomasMatousek — Wed, 11 Nov 2009 18:28:11 GMT

We have some basic line mapping on ScriptSource but it's missing support for multiple file debug info (it only stores a line to line mapping). Also the languages currently ignore this mapping. We should, however, fix this in future versions.

Do you implement your own language? If so a workround would be to add some public method taking the mapping on your LanguageContext implementation. The host can then bypass the default source unit compilation code path - retrieve the context from a ScriptEngine by calling HostingHelpers.GetLanguageContext and call the method directly. If you want more clean design that also works with remoting you can implement a service (see ScriptEngine.GetService<T>).

New Post: Hosting interface and multiple-file source

dotneteer — Wed, 11 Nov 2009 06:58:09 GMT

Hi, I have a situation that I have my source in multiple files (such as include files). These files are preprocessed into a single script file. In order to inject debug info, I need to pass some mapping between my source code and the merged code to my compiler. I use ScriptEngine.CreateScriptSource method to pass my source code to the hosting interface. I could subclass the TextContentProvider to pass my mapping information. On the other end, I subclass LanguageContext and override the CompileSourceCode method. As far as I can see, the SourceUnit does carry the TextContentProvider. However, SourceUnit is a sealed class and only exposes the Reader of TextContentProvider through the GetReader() method. As a result, I am not able to retrieve whatever mapping information that I added to the TextContentProvider subclass. Is there a way around this problem? Thanks.

New Post: GetDynamicMemberNames() doesn't provide much info

billchi — Fri, 06 Nov 2009 16:34:35 GMT

I think you're right, and when C# gets a REPL, certainly looking at doing some live intellisense (from objects in the execution environment) would make that experience better.

Bill

From: r_keith_hill [mailto:notifications@codeplex.com]
Sent: Wednesday, November 04, 2009 9:20 PM
To: Bill Chiles
Subject: Re: GetDynamicMemberNames() doesn't provide much info [dlr:74111]

From: r_keith_hill

Yeah I get the issue with expando objects. It will be interesting to see how the C# team can narrow the gap between the current edit-compile-debug environment and REPL environments that are much better suited to using dynamic types.

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New Post: GetDynamicMemberNames() doesn't provide much info

r_keith_hill — Thu, 05 Nov 2009 05:20:21 GMT

New Post: GetDynamicMemberNames() doesn't provide much info

dinov — Thu, 05 Nov 2009 01:04:05 GMT

You’re absolutely correct about what this method is for. IronPython also uses it for the dir() function for displaying what members are available and I believe the VS debugger also uses it for displaying members.

I think the biggest problem w/ intellisense is that C# doesn’t know either type of the normal object or the type of the meta object. If you solve knowing the type of the normal object it also still doesn’t give you the meta object because the object could be doing something wacky in its IDMOP implementation (e.g. conditionally returning different kinds of meta objects). And even if you could somehow make a meta objects for a lot of meta objects this would be insufficient because the members are determined at runtime – ExpandoObject is a good example of this.

So it’s tough problem that probably needs different solutions for different types of objects/meta objects and cooperation between them and whatever language is doing intellisense.

From: r_keith_hill [mailto:notifications@codeplex.com]
Sent: Wednesday, November 04, 2009 2:28 PM
To: Dino Viehland
Subject: GetDynamicMemberNames() doesn't provide much info [dlr:74111]

From: r_keith_hill

I was reading a draft of a book covering C# 4.0 and it gives an example of using GetDynamicMemberNames to return the list of XElement names for a DynamicObject implementation that wraps an XML file. The idea was that REPL environments like Python can query the member names to provide Intellisense. I get this feature all the time in PowerShell where, if I have created the object, PoweShell can reflect upon the instance and provide Intellisense. If these environments encounter a DynamicObject instance then clearly the data return via reflection isn't very useful. I thought GetDynamicMemberNames() was the way I could write my object to interact better in these other REPL environments.

BTW the Intellisense capability *could* be made available in C# - in theory. The C# compiler,while doing a background compile, would need to create an instance of the object - or better yet - create an instance of a metaobject ie an object that *just* describes the runtime type info for the dynamic object. This metaobject should have no destructive side effects but it probably would need some extra info. Like the XML wrapper would need the path to the XML file. Plus to get a really good Intellisense experience the DynamicObject (or metaobject) needs to be able to return much richer info: member description, parameter information, parameter description, return type, etc.

Thoughts?

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New Post: GetDynamicMemberNames() doesn't provide much info

r_keith_hill — Wed, 04 Nov 2009 22:27:31 GMT

Thoughts?

New Post: Evaluate function in DLR hosting

matan504 — Mon, 02 Nov 2009 18:32:08 GMT

dinov wrote:

engine.Execute(…) returns an object already – so you can just do ‘return engine.Execute(“2+2”);‘

I see. ok i'll try that.

Thanks a lot!

New Post: Evaluate function in DLR hosting

dinov — Mon, 02 Nov 2009 18:19:45 GMT

engine.Execute(…) returns an object already – so you can just do ‘return engine.Execute(“2+2”);‘

From: matan504 [mailto:notifications@codeplex.com]
Sent: Monday, November 02, 2009 10:02 AM
To: Dino Viehland
Subject: Re: Evaluate function in DLR hosting [dlr:73825]

From: matan504

dinov wrote:

You can do engine.Execute(‘2+2’) and it’ll auto-detect that it’s an expression and return the value.

how do i return an object from that?

this Evaluate command is in a C# function that i wrote, and i need it to return an object.

Thanks for the fast reply!

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New Post: Evaluate function in DLR hosting

matan504 — Mon, 02 Nov 2009 18:01:41 GMT

dinov wrote:

You can do engine.Execute(‘2+2’) and it’ll auto-detect that it’s an expression and return the value.

how do i return an object from that?

this Evaluate command is in a C# function that i wrote, and i need it to return an object.

Thanks for the fast reply!

New Post: Evaluate function in DLR hosting

dinov — Mon, 02 Nov 2009 17:34:55 GMT

You can do engine.Execute(‘2+2’) and it’ll auto-detect that it’s an expression and return the value.

From: matan504 [mailto:notifications@codeplex.com]
Sent: Monday, November 02, 2009 7:51 AM
To: Dino Viehland
Subject: Evaluate function in DLR hosting [dlr:73825]

From: matan504

Hi,

I'm currently fixing some code that used IronPython 1 and now uses IronPython 2. of course I noticed that the DLR hosting interface has changed and now uses Microsoft.Scripting and Microsoft.Scripting.Hosting packages.

My problem is that I have an old interface command: "python_engine.Evaluate(string_command)" that returns an Object, and I can't find the equivalent in the new Hosting API.

Could you please give any advice or help,

Thanks in advance,

Matt

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