Mailing-List: contact issues-help@drill.apache.org; run by ezmlm
Precedence: bulk
Reply-To: dev@drill.apache.org
Date: Fri, 9 Dec 2016 04:37:00 +0000 (UTC)
From: "ASF GitHub Bot (JIRA)" <jira@apache.org>
To: issues@drill.apache.org
Message-ID: <JIRA.13021973.1479607723000.480324.1481258220483@Atlassian.JIRA>
In-Reply-To: <JIRA.13021973.1479607723000@Atlassian.JIRA>
References: <JIRA.13021973.1479607723000@Atlassian.JIRA> <JIRA.13021973.1479607723588@arcas>
Subject: [jira] [Commented] (DRILL-5052) Option to debug generated Java code
 using an IDE
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
archived-at: Fri, 09 Dec 2016 04:37:02 -0000


    [ https://issues.apache.org/jira/browse/DRILL-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15734276#comment-15734276 ] 

ASF GitHub Bot commented on DRILL-5052:
---------------------------------------

Github user paul-rogers commented on a diff in the pull request:

    https://github.com/apache/drill/pull/660#discussion_r91640094
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/compile/JaninoClassCompiler.java ---
    @@ -58,5 +56,27 @@ public JaninoClassCompiler(ClassLoader parentClassLoader, boolean debug) {
       }
     
       @Override
    +  public Map<String,byte[]> compile(final ClassNames className, final String sourceCode)
    +      throws CompileException, IOException, ClassNotFoundException {
    +
    +    ClassFile[] classFiles = doCompile( className, sourceCode );
    +    Map<String,byte[]> results = new HashMap<>( );
    +    for(int i = 0;  i < classFiles.length;  i++) {
    +      ClassFile classFile = classFiles[i];
    +      results.put( classFile.getThisClassName(), classFile.toByteArray() );
    +    }
    +    return results;
    +  }
    +
    +  public ClassFile[] doCompile(final ClassNames className, final String sourceCode)
    --- End diff --
    
    Done.


> Option to debug generated Java code using an IDE
> ------------------------------------------------
>
>                 Key: DRILL-5052
>                 URL: https://issues.apache.org/jira/browse/DRILL-5052
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Execution - Codegen
>    Affects Versions: 1.8.0
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>            Priority: Minor
>
> Drill makes extensive use of Java code generation to implement its operators. Drill uses sophisticated techniques to blend generated code with pre-compiled template code. An unfortunate side-effect of this behavior is that it is very difficult to visualize and debug the generated code.
> As it turns out, Drill's code-merge facility is, in essence, a do-it-yourself version of subclassing. The Drill "template" is the parent class, the generated code is the subclass. But, rather than using plain-old subclassing, Drill combines the code from the two classes into a single "artificial" packet of byte codes for which no source exists.
> Modify the code generation path to optionally allow "plain-old Java" compilation: the generated code is a subclass of the template. Compile the generated code as a plain-old Java class with no byte-code fix-up. Write the code to a known location that the IDE can search when looking for source files.
> With this change, developers can turn on the above feature, set a breakpoint in a template, then step directly into the generated Java code called from the template.
> This feature should be an option, enabled by developers when needed. The existing byte-code technique should be used for production code generation.


--
This message was sent by Atlassian JIRA
(v6.3.4#6332)