| 6efd446399ba7a9bb68bf8ddb5a458072a1381b0 |
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23-Apr-2010 |
Andy McFadden <fadden@android.com> |
Fix a deadlock in the breakpoint code.
In froyo we started using "hard" breakpoints, where we replace the
existing opcodes with breakpoint instructions. This requires some
coordination to avoid confusing the verifier. The previous approach
allowed the breakpoints to be inserted, and "undid" them while the
verifier ran; this worked, but caused us to be holding a lock for
an extended period.
The new approach just avoids altering the bytecode of unverified
classes, and then "flushes" the breakpoint set out between the time
when verification completes and class initialization starts. This
removes the possibility of blocking with the lock held, and makes
everything much simpler.
For bug 2615063.
(cherry-pick from dalvik-dev)
Change-Id: I75f19b0cc71fc0babb50ab299c6c5a865e06c919
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| 96516932f1557d8f48a8b2dbbb885af01a11ef6e |
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29-Oct-2009 |
Andy McFadden <fadden@android.com> |
Change the way breakpoints work.
This replaces the breakpoint mechanism with a more efficient approach.
We now insert breakpoint instructions into the bytecode stream instead of
maintaining a table. This requires mapping DEX files as private instead
of shared, which allows copy-on-write to work. mprotect() is used to
guard the pages against inadvertent writes.
Unused opcode EC is now OP_BREAKPOINT. It's not recognized by dexdump or
any interpreter except portdbg, but it can be encountered by the bytecode
verifier (the debugger can request breakpoints in unverified code).
Breakpoint changes are blocked while the verifier runs to avoid races.
This eliminates method->debugBreakpointCount, which is no longer needed.
(Also, it clashed with LinearAlloc's read-only mode.)
The deferred verification error mechanism was using a code-copying
approach to modify the bytecode stream. That has been changed to use
the same copy-on-write modification mechanism.
Also, normalized all PAGE_SIZE/PAGESIZE references to a single
SYSTEM_PAGE_SIZE define.
Simple Fibonacci computation test times (opal-eng):
JIT, no debugger: 10.6ms
Fast interp, no debugger: 36ms
Portable interp, no debugger: 43.8ms
ORIG debug interp, no breakpoints set: 458ms
ORIG debug interp, breakpoint set nearby: 697ms
NEW debug interp, no breakpoints set: 341ms
NEW debug interp, breakpoints set nearby: 341ms
Where "nearby" means there's a breakpoint in the method doing the
computation that isn't actually hit -- the VM had an optimization where
it flagged methods with breakpoints and skipped some of the processing
when possible.
The bottom line is that code should run noticeably faster while a
debugger is attached.
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| 72e93344b4d1ffc71e9c832ec23de0657e5b04a5 |
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13-Nov-2009 |
Jean-Baptiste Queru <jbq@google.com> |
eclair snapshot
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| 686e1e23324f1c1f358f29f13f23e57b41c00eaa |
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27-May-2009 |
Andy McFadden <fadden@android.com> |
Correct handling of certain incompatible class changes.
Tests 065 and 066 depened on the old behavior of the verifier. Updating
them to the new behavior wasn't enough, though, because they weren't
reporting the right error. The verifier's resolution code now examines
the exception to see if the load failure was caused by an incompatible
class change error.
I also updated the description of test 071 to note that it will fail on
the device if you don't have an sdcard.
Added a method to get the exception "cause" field. It handles the
"uninitialized" state, which I keep forgetting about.
Spruced up dvmDumpObject, which hadn't been used in a while. Fixed a
warning in Profile.c.
For internal bug 1866729.
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| 99409883d9c4c0ffb49b070ce307bb33a9dfe9f1 |
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19-Mar-2009 |
The Android Open Source Project <initial-contribution@android.com> |
auto import //branches/master/...@140412
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| af93f33a83ecbd44b8a946bbad5291a79aadc2e8 |
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04-Mar-2009 |
Jean-Baptiste Queru <jbq@google.com> |
Use static const variable for speed. Clarify a comment.
Fixes http://code.google.com/p/android/issues/detail?id=2088
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| f6c387128427e121477c1b32ad35cdcaa5101ba3 |
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04-Mar-2009 |
The Android Open Source Project <initial-contribution@android.com> |
auto import from //depot/cupcake/@135843
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| f72d5de56a522ac3be03873bdde26f23a5eeeb3c |
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04-Mar-2009 |
The Android Open Source Project <initial-contribution@android.com> |
auto import from //depot/cupcake/@135843
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| 5d709784bbf5001012d7f25172927d46f6c1abe1 |
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11-Feb-2009 |
The Android Open Source Project <initial-contribution@android.com> |
auto import from //branches/cupcake/...@130745
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| 4c1a2915e40eceeb68dbc323d28b8bf8763af83b |
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20-Jan-2009 |
The Android Open Source Project <initial-contribution@android.com> |
auto import from //branches/cupcake/...@127101
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| cc05ad238516f1303687aba4a978e24e57c0c07a |
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10-Jan-2009 |
The Android Open Source Project <initial-contribution@android.com> |
auto import from //branches/cupcake/...@125939
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| 89c1feb0a69a7707b271086e749975b3f7acacf7 |
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18-Dec-2008 |
The Android Open Source Project <initial-contribution@android.com> |
Code drop from //branches/cupcake/...@124589
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| 2ad60cfc28e14ee8f0bb038720836a4696c478ad |
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21-Oct-2008 |
The Android Open Source Project <initial-contribution@android.com> |
Initial Contribution
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