| 5dfcc78af479937ba8dafceefd9b1931a88dfaaf |
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11-Aug-2012 |
Ard Biesheuvel <ard.biesheuvel@gmail.com> |
hardening: eliminate all text relocations from lidbvm
This patch consists of:
- changes to mterp/ that turn all literals from absolute
to PC relative, so the relocations can be resolved at
(build) link time
- changes to compiler/template/ that result in the
compiler templates to live in the non-executable
.data.rel.ro section (this code is never executed
directly, only from the jit heap, so there is no
reason to put it in the .text section)
Change-Id: I2dc97bd4720b393a74b7277a188f0c7b681fc932
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@gmail.com>
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| 9a3147c7412f4794434b4c2604aa2ba784867774 |
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03-Mar-2011 |
buzbee <buzbee@google.com> |
Interpreter restructuring
This is a restructuring of the Dalvik ARM and x86 interpreters:
o Combine the old portstd and portdbg interpreters into a single
portable interpreter.
o Add debug/profiling support to the fast (mterp) interpreters.
o Delete old mechansim of switching between interpreters. Now, once
you choose an interpreter at startup, you stick with it.
o Allow JIT to co-exist with profiling & debugging (necessary for
first-class support of debugging with the JIT active).
o Adds single-step capability to the fast assembly interpreters without
slowing them down (and, in fact, measurably improves their performance).
o Remove old "polling for safe point" mechanism. Breakouts now achieved
via modifying base of interpreter handler table.
o Simplify interpeter control mechanism.
o Allow thread-granularity control for profiling & debugging
The primary motivation behind this change was to improve the responsiveness
of debugging and profiling and to make it easier to add new debugging and
profiling capabilities in the future. Instead of always bailing out to the
slow debug portable interpreter, we can now stay in the fast interpreter.
A nice side effect of the change is that the fast interpreters
got a healthy speed boost because we were able to replace the
polling safepoint check that involved a dozen or so instructions
with a single table-base reload. When combined with the two earlier CLs
related to this restructuring, we show a 5.6% performance improvement
using libdvm_interp.so on the Checkers benchmark relative to Honeycomb.
Change-Id: I8d37e866b3618def4e582fc73f1cf69ffe428f3c
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| 98f3eb12bf2a33c49712e093d5cc2aa713a93aa5 |
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01-Mar-2011 |
buzbee <buzbee@google.com> |
Exception cleanup in the assembly interpreters
Removed the last of the "exception as strings" calls from the
assembly interpreters, replacing them with the helper functions.
Change-Id: I4c44cde348ed7d2ea99f908bc22166afeb5e3d37
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| 9f601a917c8878204482c37aec7005054b6776fa |
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12-Feb-2011 |
buzbee <buzbee@google.com> |
Interpreter restructuring: eliminate InterpState
The key datastructure for the interpreter is InterpState.
This change eliminates it, merging its data with the Thread structure.
Here's why:
In principio creavit Fadden Thread et InterpState. And it was good.
Thread holds thread-private state, while InterpState captures data
associated with a Dalvik interpreter activation. Because JNI calls
can result in nested interpreter invocations, we can have more than one
InterpState for each actual thread. InterpState was relatively small,
and it all worked well. It was used enough that in the Arm version
a register (rGLUE) was dedicated to it.
Then, along came the JIT guys, who saw InterpState as a convenient place
to dump all sorts of useful data that they wanted quick access to through
that dedicated register. InterpState grew and grew. In terms of
space, this wasn't a big problem - but it did mean that the initialization
cost of each interpreter activation grew as well. For applications
that do a lot of callbacks from native code into Dalvik, this is
measurable. It's also mostly useless cost because much of the JIT-related
InterpState initialization was setting up useful constants - things that
don't need to be saved and restored all the time.
The biggest problem, though, deals with thread control. When something
interesting is happening that needs all threads to be stopped (such as
GC and debugger attach), we have access to all of the Thread structures,
but we don't have access to all of the InterpState structures (which
may be buried/nested on the native stack). As a result, polling for
thread suspension is done via a one-indirection pointer chase. InterpState
itself can't hold the stop bits because we can't always find it, so
instead it holds a pointer to the global or thread-specific stop control.
Yuck.
With this change, we eliminate InterpState and merge all needed data
into Thread. Further, we replace the decidated rGLUE register with a
pointer to the Thread structure (rSELF). The small subset of state
data that needs to be saved and restored across nested interpreter
activations is collected into a record that is saved to the interpreter
frame, and restored on exit. Further, these small records are linked
together to allow tracebacks to show nested activations. Old InterpState
variables that simply contain useful constants are initialized once at
thread creation time.
This CL is large enough by itself that the new ability to streamline
suspend checks is not done here - that will happen in a future CL. Here
we just focus on consolidation.
Change-Id: Ide6b2fb85716fea454ac113f5611263a96687356
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| d82097f6b409c5cd48568e54eb701604c3cceb18 |
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27-Sep-2010 |
buzbee <buzbee@google.com> |
Change GC card making to use object head, bug fix for volatile sput obj
This CL changes the way we mark GC card to consistently use the object
head (previously, we marked somewhere in the object - often the head, but
not always). Also, previously a coding error caused us to skip the card
mark for OP_APUT_OBJECT_VOLATILES. Fixed here.
Change-Id: I133ef6395c51a0466c9708209b08e79c3083aff2
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| d3b0a4bf6b2e38e6e9e80e203ca753e941084103 |
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27-Sep-2010 |
buzbee <buzbee@google.com> |
Change GC card making to use object head, bug fix for volatile sput obj
This CL changes the way we mark GC card to consistently use the object
head (previously, we marked somewhere in the object - often the head, but
not always). Also, previously a coding error caused us to skip the card
mark for OP_APUT_OBJECT_VOLATILES. Fixed here.
Change-Id: I53eb333b9bd0b770201af0dc617d9a8f38afa699
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| 919eb063ce4542d3698e10e20aba9a2dfbdd0f82 |
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12-Jul-2010 |
buzbee <buzbee@google.com> |
Interpreter & JIT support for write barriers
In this iteration, cards are marked on either the store address or
the object head (whichever leads to faster code). In all cases,
though, card marks are deferred until after the associated store
has completed.
Change-Id: I633d6e8c3bebdb80bde92efb4fa6fc7cc84f60fc
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| 7365493ad8d360c1dcf9cd8b6eee62747af01cae |
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09-Jun-2010 |
Carl Shapiro <cshapiro@google.com> |
Remove repeated newlines at the end of files.
Change-Id: I1e3d103a7b932ef21acedb6438c0f26b315df28f
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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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| 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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