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From "Ilya Berezhniuk (JIRA)" <j...@apache.org>
Subject [jira] Closed: (HARMONY-4689) [drlvm][jvmti] JVMTI Extension: Native Code Access Interface (NCAI) implementation
Date Thu, 29 Nov 2007 17:35:45 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-4689?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Ilya Berezhniuk closed HARMONY-4689.

Everything looks fine.

Thanks Gregory, all.

> [drlvm][jvmti] JVMTI Extension: Native Code Access Interface (NCAI) implementation
> ----------------------------------------------------------------------------------
>                 Key: HARMONY-4689
>                 URL: https://issues.apache.org/jira/browse/HARMONY-4689
>             Project: Harmony
>          Issue Type: New Feature
>          Components: Contributions, DRLVM
>            Reporter: Ilya Berezhniuk
>            Assignee: Gregory Shimansky
>         Attachments: 2007_11_11__changes_in_existing_VM_files.patch, 2007_11_11__changes_in_patch.diff,
2007_11_11__patch_for_new_files_from_bulk.patch, 2007_11_13__changes_in_existing_VM_files.patch,
2007_11_13__changes_in_patch.diff, 2007_11_13__patch_for_new_files_from_bulk.patch, ncai_bulk.zip
> The contribution consists of the following component: 
>   - Native Code Access Interface (NCAI) implementation
> JVMTI enables debugging of Java frames but ignores native frames (e.g., frames within
JNI code).  NCAI is a prototype JVMTI extension interface that allows the VM to participate
in debugging operations on native code as well.  At EclipseCon 2007, we demoed this NCAI component
along with a seamless mixed Java/JNI debugger that consumes this interface for an Eclipse
extension (http://www.eclipsecon.org/2007/index.php?page=sub/&id=4129).  We wanted to
donate this component which was prototyped using Apache Harmony so that it could help (a)
promote mixed Java/JNI debugging discussions and (b) be harvested for potential additional
uses within Apache Harmony.
> Below are some details on NCAI implementation.
> 1) Basic features provided by the current NCAI implementation:
> - Setting breakpoints in native code
> - Single stepping through native code with 3 step modes: STEP_INTO, STEP_OVER and STEP_OUT
> - Trapping OS-level signals/exceptions
> - Trapping loading and unloading of dynamic/shared libraries
> - Getting information about loaded dynamic/shared libraries
> - Getting list of threads running in VM process
> - OS-level threads suspending/resuming/terminating
> - Processor registers inspection and modification (for suspended threads)
> - Getting call stack for suspended threads including both Java and native frames
> - Memory inspection and modification
> - Getting OS-level signals/exceptions information
> 2) Harmony base:
> - Bulk contains a patch for existing DRLVM code and a set of new files arranged with
DRLVM directory structure
> - Patch was rebased to apply over DRLVM revision r567700
> 3) Current implementation provides all the features listed above for IA-32 architecture
only. DRLVM remains buildable on other platforms, but not all the features will work.

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