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Posted to commits@harmony.apache.org by "Gregory Shimansky (JIRA)" <ji...@apache.org> on 2008/01/14 18:56:34 UTC
[jira] Created: (HARMONY-5386) [drlvm][verifier] Unaligned access
to memory on IPF
[drlvm][verifier] Unaligned access to memory on IPF
---------------------------------------------------
Key: HARMONY-5386
URL: https://issues.apache.org/jira/browse/HARMONY-5386
Project: Harmony
Issue Type: Bug
Components: DRLVM
Environment: Linux IPF
Reporter: Gregory Shimansky
Priority: Minor
When running DRLVM on IPF it gives errors about unaligned access to the memory. The access happens in verifier in instr_props.h:287 when accessing propHashTable pointer. It happens to be aligned to 4 bytes, not to 8 as required for an array of pointers.
It happens because verifier's internal allocator doesn't align returned pointers to any value. The sequence of allocations looks like this: 1024 bytes, 4 bytes, 128 bytes. The 3rd allocation is not aligned because it goes after an allocation of 4 bytes. This is exactly the place where propHashTable is allocated in the code.
To make code work correctly on IPF it is either necessary to change verifier's internal allocator to make it possible to align returned pointers or it is necessary to align pointers returned by allocator in each case individually.
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[jira] Assigned: (HARMONY-5386) [drlvm][verifier] Unaligned access
to memory on IPF
Posted by "Mikhail Loenko (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HARMONY-5386?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mikhail Loenko reassigned HARMONY-5386:
---------------------------------------
Assignee: Mikhail Loenko
> [drlvm][verifier] Unaligned access to memory on IPF
> ---------------------------------------------------
>
> Key: HARMONY-5386
> URL: https://issues.apache.org/jira/browse/HARMONY-5386
> Project: Harmony
> Issue Type: Bug
> Components: DRLVM
> Environment: Linux IPF
> Reporter: Gregory Shimansky
> Assignee: Mikhail Loenko
> Priority: Minor
>
> When running DRLVM on IPF it gives errors about unaligned access to the memory. The access happens in verifier in instr_props.h:287 when accessing propHashTable pointer. It happens to be aligned to 4 bytes, not to 8 as required for an array of pointers.
> It happens because verifier's internal allocator doesn't align returned pointers to any value. The sequence of allocations looks like this: 1024 bytes, 4 bytes, 128 bytes. The 3rd allocation is not aligned because it goes after an allocation of 4 bytes. This is exactly the place where propHashTable is allocated in the code.
> To make code work correctly on IPF it is either necessary to change verifier's internal allocator to make it possible to align returned pointers or it is necessary to align pointers returned by allocator in each case individually.
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