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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5052) Option to debug generated Java code using an IDE
Date Thu, 08 Dec 2016 15:26:59 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15732491#comment-15732491
] 

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

Github user arina-ielchiieva commented on a diff in the pull request:

    https://github.com/apache/drill/pull/660#discussion_r91277152
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/compile/CodeCompiler.java
---
    @@ -33,36 +32,71 @@
     import com.google.common.cache.LoadingCache;
     import com.google.common.collect.Lists;
     
    +/**
    + * Global code compiler mechanism shared by all threads and operators.
    + * Holds a single cache of generated code (keyed by code source) to
    + * prevent compiling identical code multiple times. Supports both
    + * the byte-code merging and plain-old Java methods of code
    + * generation and compilation.
    + */
    +
     public class CodeCompiler {
    -//  private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(CodeCompiler.class);
    +
    +  public static final String COMPILE_BASE = "drill.exec.compile";
    +  String MAX_LOADING_CACHE_SIZE_CONFIG = COMPILE_BASE + ".cache_max_size";
    --- End diff --
    
    public static final?


> 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.



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