Reason for revert:
[Sheriff] Leads to crashes on all webrtc chromium testers, e.g.:
https://build.chromium.org/p/chromium.webrtc/builders/Mac%20Tester/builds/49664
Original issue's description:
> [heap] Parallel newspace evacuation, semispace copy, and compaction \o/
>
> All parallelism can be turned off using --predictable, or --noparallel-compaction.
>
> This patch completely parallelizes
> - semispace copy: from space -> to space (within newspace)
> - newspace evacuation: newspace -> oldspace
> - oldspace compaction: oldspace -> oldspace
>
> Previously newspace has been handled sequentially (semispace copy, newspace
> evacuation) before compacting oldspace in parallel. However, on a high level
> there are no dependencies between those two actions, hence we parallelize them
> altogether. We base the number of evacuation tasks on the overall set of
> to-be-processed pages (newspace + oldspace compaction pages).
>
> Some low-level details:
> - The hard cap on number of tasks has been lifted
> - We cache store buffer entries locally before merging them back into the global
> StoreBuffer in a finalization phase.
> - We cache AllocationSite operations locally before merging them back into the
> global pretenuring storage in a finalization phase.
> - AllocationSite might be compacted while they would be needed for newspace
> evacuation. To mitigate any problems we defer checking allocation sites for
> newspace till merging locally buffered data.
>
> CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_asan_rel,v8_linux64_tsan_rel,v8_mac64_asan_rel
> BUG=chromium:524425
> LOG=N
> R=hpayer@chromium.org, ulan@chromium.org
>
> Committed: https://crrev.com/8f0fd8c0370ae8c5aab56491b879d7e30c329062
> Cr-Commit-Position: refs/heads/master@{#33523}
TBR=hpayer@chromium.org,ulan@chromium.org,mlippautz@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:524425
Review URL: https://codereview.chromium.org/1643473002
Cr-Commit-Position: refs/heads/master@{#33539}
All parallelism can be turned off using --predictable, or --noparallel-compaction.
This patch completely parallelizes
- semispace copy: from space -> to space (within newspace)
- newspace evacuation: newspace -> oldspace
- oldspace compaction: oldspace -> oldspace
Previously newspace has been handled sequentially (semispace copy, newspace
evacuation) before compacting oldspace in parallel. However, on a high level
there are no dependencies between those two actions, hence we parallelize them
altogether. We base the number of evacuation tasks on the overall set of
to-be-processed pages (newspace + oldspace compaction pages).
Some low-level details:
- The hard cap on number of tasks has been lifted
- We cache store buffer entries locally before merging them back into the global
StoreBuffer in a finalization phase.
- We cache AllocationSite operations locally before merging them back into the
global pretenuring storage in a finalization phase.
- AllocationSite might be compacted while they would be needed for newspace
evacuation. To mitigate any problems we defer checking allocation sites for
newspace till merging locally buffered data.
CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_asan_rel,v8_linux64_tsan_rel,v8_mac64_asan_rel
BUG=chromium:524425
LOG=N
R=hpayer@chromium.org, ulan@chromium.org
Review URL: https://codereview.chromium.org/1577853007
Cr-Commit-Position: refs/heads/master@{#33523}
This increases the size of register operands to be 16-bit.
Not all bytecodes have wide register variants, so when they are
needed a register translator will copy them into a small area
reserved at the top of the 8-bit register range and these registers
are supplied as arguments to the bytecode with 8-bit operands.
This is non-intrusive for typical bytecode where the number of
registers is less than 120. For bytecodes with wide register
operands (above the window) their index needs to be translated
to avoid the reserved translation window.
Enables splay.js to run in Octane and a handful of mjsunit tests.
BUG=v8:4280,v8:4675
LOG=NO
Review URL: https://codereview.chromium.org/1613163002
Cr-Commit-Position: refs/heads/master@{#33516}
The current support for try-catch in the interpreter can handle most of
the cases appearing in our test suite. Also the flag in question did not
detect try-finally constructs. This removes the flag and instead extends
the test expectations.
R=rmcilroy@chromium.org
BUG=v8:4674
LOG=n
Review URL: https://codereview.chromium.org/1631593003
Cr-Commit-Position: refs/heads/master@{#33494}
Is it frozen water? Is it a train? No, but it's both (relatively) fast and
(relatively) cool, it's ICE, the IC-Explorer. Upload an IC trace and you can
easily* drill-down on where most IC changes happen. It even comes with a colored
title and runs in your favourite browser without dependencies (yeah, I'm looking
at you JQuery!)
*according to a user study with a random 1-person group.
R=mvstanton@chromium.org
BUG=
Review URL: https://codereview.chromium.org/1618213003
Cr-Commit-Position: refs/heads/master@{#33467}
This simplifies correlating offsets with the output from
--print-opt-code, which outputs offsets in decimal.
We keep the hex output since branch instructions in the perf dump use
hex labels. We just include the decimal offset along with the hex offset.
BUG=
Review URL: https://codereview.chromium.org/1612403002
Cr-Commit-Position: refs/heads/master@{#33455}
Show tick count, besides the percentage spent on an
instruction. Aids perf investigations where we deal with
stalls, for example. Percentage-wise, the execution appears
distributed similarly, but the regression becomes more
apparent in the tick counts.
Review URL: https://codereview.chromium.org/1607323003
Cr-Commit-Position: refs/heads/master@{#33452}
Reason for revert:
The random nature of the tests caused the following buildbot to fail: https://build.chromium.org/p/client.v8/builders/V8%20Linux%20gcc%204.8/builds/4724/steps/Check/logs/stdio
Original issue's description:
> [profiler] Implement POC Sampling Heap Profiler
>
> This implements a proof-of-concept sampling based heap profiler inspired by
> tcmalloc's heap profiler [1] and Go's mprof/memprofile [2].
>
> The basic idea is the sample allocations using a randomized Poisson process. At
> any point in time we can cheaply request the set of live sample objects that
> should be a representative sample of heap. Samples include stack-traces from the
> allocation sites, making this an effective tool for memory leak debugging.
>
> Unlike AllocationTracking, this is intended to be cheap and usable online in
> production.
>
> The proof-of-concept is only sampling new-space allocations at this point.
> Support for sampling paged space and native allocations is anticipated in the
> future.
>
> [1] http://goog-perftools.sourceforge.net/doc/heap_profiler.html
> [2] http://blog.golang.org/profiling-go-programs
>
> Committed: https://crrev.com/e5a9947811db9c9e23557dbad27f8b8a349b3262
> Cr-Commit-Position: refs/heads/master@{#33448}
TBR=jochen@chromium.org,alph@chromium.org,hpayer@chromium.org,yangguo@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
Review URL: https://codereview.chromium.org/1615173002
Cr-Commit-Position: refs/heads/master@{#33449}
This implements a proof-of-concept sampling based heap profiler inspired by
tcmalloc's heap profiler [1] and Go's mprof/memprofile [2].
The basic idea is the sample allocations using a randomized Poisson process. At
any point in time we can cheaply request the set of live sample objects that
should be a representative sample of heap. Samples include stack-traces from the
allocation sites, making this an effective tool for memory leak debugging.
Unlike AllocationTracking, this is intended to be cheap and usable online in
production.
The proof-of-concept is only sampling new-space allocations at this point.
Support for sampling paged space and native allocations is anticipated in the
future.
[1] http://goog-perftools.sourceforge.net/doc/heap_profiler.html
[2] http://blog.golang.org/profiling-go-programs
Review URL: https://codereview.chromium.org/1555553002
Cr-Commit-Position: refs/heads/master@{#33448}
This removes the above flag definition. The flag is no longer needed as
the default implementation is more than capable of faking presence of
handling of try-catch and try-finally constructs by now.
R=rmcilroy@chromium.org
BUG=v8:4674
LOG=n
Review URL: https://codereview.chromium.org/1603063003
Cr-Commit-Position: refs/heads/master@{#33402}
This implements a first version of exception handler table construction
within the interpreter. Note that the local control flow for try-catch
and try-finally statements is still off, and also stack unwinding does
not yet respect interpreter frames. But generated handler tables should
be populated correctly already.
R=oth@chromium.org
BUG=v8:4674
LOG=n
Review URL: https://codereview.chromium.org/1607433005
Cr-Commit-Position: refs/heads/master@{#33400}
Now that we support eval in Ignition, remove the fallback for eval checks
and make the flag only fallback on catch blocks.
BUG=v8:4280,v8:4676
LOG=N
Review URL: https://codereview.chromium.org/1595223004
Cr-Commit-Position: refs/heads/master@{#33384}
This splits out the SourcePosition class into a separate header file.
Reason for this refactoring is that said class is mostly used by the
Crankshaft compiler and not needed for all compilers. Also having the
assembler depend on the class creates a dependency cycle.
R=bmeurer@chromium.org
Review URL: https://codereview.chromium.org/1581083009
Cr-Commit-Position: refs/heads/master@{#33325}
Split RegisterAllocationScope out of ExpressionResult and allocate one
for each statement. This ensures that we always have an outer register
allocation scope for statement code (used in CountOperation and
RegisterExecutionResult). Also refactored the register allocator code to
move it to it's own file and rename from TemporaryRegisterScope to
BytecodeRegisterAllocator.
BUG=v8:4280
LOG=N
Review URL: https://codereview.chromium.org/1587033002
Cr-Commit-Position: refs/heads/master@{#33296}
- Use valgrind from v8/third_party/valgrind fetched as custom
deps. This will make the check more portable on buildbot
slaves without the need to install valgrind.
- Build path to checked executable to be ready for swarming.
BUG=chromium:535160
LOG=n
NOTRY=true
Review URL: https://codereview.chromium.org/1585093002
Cr-Commit-Position: refs/heads/master@{#33287}
We use a scratchpad to remember visited allocation sites for post processing
(making tenure decisions). The previous implementation used a rooted FixedArray
with constant length (256) to remember all sites. Updating the scratchpad is a
bottleneck in any parallel/concurrent implementation of newspace evacuation.
The new implementation uses a HashMap with allocation sites as keys and
temporary counts as values. During evacuation we collect a local hashmap of
visited allocation sites. Upon merging the local hashmap back into a global one
we update potential forward pointers of compacted allocation sites. The
scavenger can directly enter its entries into the global hashmap. Note that the
actual memento found count is still kept on the AllocationSite as it needs to
survive scavenges and full GCs.
BUG=chromium:524425
LOG=N
R=hpayer@chromium.org
Review URL: https://codereview.chromium.org/1535723002
Cr-Commit-Position: refs/heads/master@{#33233}
This migrates the remaining Date builtins to C++ and removes obsolete
intrinsics and JavaScript wrappers. This reduces the overhead imposed
by the Date builtins, and will allow us to optimize them later in the
TurboFan compiler, while the interpreter doesn't need to worry about
them.
R=yangguo@chromium.org
BUG=chromium:576574
LOG=n
Committed: https://crrev.com/1e51af1a5c80b1650de47dd4bc8f846fa2d85281
Cr-Commit-Position: refs/heads/master@{#33228}
Review URL: https://codereview.chromium.org/1579613002
Cr-Commit-Position: refs/heads/master@{#33231}
Reason for revert:
[Sheriff] Breaks https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20noi18n%20-%20debug/builds/5711
Original issue's description:
> [builtins] Refactor the remaining Date builtins.
>
> This migrates the remaining Date builtins to C++ and removes obsolete
> intrinsics and JavaScript wrappers. This reduces the overhead imposed
> by the Date builtins, and will allow us to optimize them later in the
> TurboFan compiler, while the interpreter doesn't need to worry about
> them.
>
> R=yangguo@chromium.org
> BUG=chromium:576574
> LOG=n
>
> Committed: https://crrev.com/1e51af1a5c80b1650de47dd4bc8f846fa2d85281
> Cr-Commit-Position: refs/heads/master@{#33228}
TBR=yangguo@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:576574
Review URL: https://codereview.chromium.org/1574223002
Cr-Commit-Position: refs/heads/master@{#33230}
This migrates the remaining Date builtins to C++ and removes obsolete
intrinsics and JavaScript wrappers. This reduces the overhead imposed
by the Date builtins, and will allow us to optimize them later in the
TurboFan compiler, while the interpreter doesn't need to worry about
them.
R=yangguo@chromium.org
BUG=chromium:576574
LOG=n
Review URL: https://codereview.chromium.org/1579613002
Cr-Commit-Position: refs/heads/master@{#33228}
This increases the size of addressable constant pool entries for jumps
to match other bytecodes using operands indexing the constant pool.
This change also introduces reservations for constant pool entries.
Reservations are used for forward jumps to ensure a constant pool entry
will be available when the jump target (label) is bound and the jump is
patched up in the bytecode array.
BUG=v8:4280
LOG=N
Review URL: https://codereview.chromium.org/1546683002
Cr-Commit-Position: refs/heads/master@{#33125}
This patch adds the basis for subclassing TypedArrays, Arrays and
ArrayBuffers through the @@species hook, added in ES2015. This is
the first patch in a series. This patch simply defines the
@@species Symbol and installs it on the appropriate constructors.
The behavior is guarded behind the --harmony-species flag.
R=cbruni
BUG=v8:4093
LOG=Y
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel
TBR=hpayer@chromium.org
Review URL: https://codereview.chromium.org/1558543002
Cr-Commit-Position: refs/heads/master@{#33095}
Adds --turbo to the set of flags run with ignition (making the
configuration pure Ignition+TurboFan except for fallbacks to
full-codegen for catch / eval). Also changes the default
--ignition-filter to allow everything, rather than omit everything.
BUG=v8:4280
LOG=N
Review URL: https://codereview.chromium.org/1537433003
Cr-Commit-Position: refs/heads/master@{#33090}
Add control for the ignition test suites. This will be
followed by a change on the infra side that targets the
ignition set instead of the hardcoded mjsunit.
After that, cctest can be enabled in a separate CL. This CL
already includes the logic for running cctest for ignition
on swarming.
BUG=v8:4280
LOG=N
Review URL: https://codereview.chromium.org/1559943002
Cr-Commit-Position: refs/heads/master@{#33089}
When the 'y' flag was shipped, the property RegExp.prototype.unicode was
accidentally also shipped. However, the existence of this property should
be a usable feature testing point. This patch adds the 'unicode' getter on
RegExp.prototype only if the --harmony-regexp-unicode flag is turned on.
R=cbruni
CC=yangguo
BUG=v8:4644
LOG=Y
Review URL: https://codereview.chromium.org/1550713002
Cr-Commit-Position: refs/heads/master@{#33049}
This is based on the Skia Implementation.
More on the project can be found here:
https://docs.google.com/a/chromium.org/document/d/1_4LAnInOB8tM_DLjptWiszRwa4qwiSsDzMkO4tU-Qes/edit#heading=h.p97rw6yt8o2j
The V8 Tracing platform will replace the isolate->event_logger().
But since the current embedders (namely chromium) currently use the isolate->event_logger, I made the default implementation (event-tracer) call into isolate->event_logger if an event_logger was set.
Once the embedders properly implement the interface (for example in chromium it would look like this: https://codereview.chromium.org/707273005/), the default implementation will be doing nothing.
Once the embedders side is fixed, we will change how V8 uses the tracing framework beyond the call from Logger:CallEventLogger. (which would also include a d8 implementation)
BUG=v8:4560
LOG=N
Review URL: https://codereview.chromium.org/988893003
Cr-Commit-Position: refs/heads/master@{#32959}
This change adds support for local control flow when building graphs
from bytecode. The change ensures loop emitted from the bytecode
generator are in natural order so the only back branches are for loops.
BUG=v8:4280
LOG=N
Review URL: https://codereview.chromium.org/1502243002
Cr-Commit-Position: refs/heads/master@{#32911}
