More specifically on 64-bit platforms, when other heuristic fail:
- in AOT mode unbox all int typed phis.
- in JIT mode unbox all non-Smi int typed phis i.e. mixed
Mint/Smi phis.
This brings treatment of int phis closer to how we treat other
boxed phis.
This considerably improves AOT code quality for loops which
our current conservative heuristic does not currently hit,
for example:
void foo(int start, int end) {
for (var i = start; i < end; i++) {
}
}
Code like this would use a boxed Phi previously which does not make
sense.
In JIT mode to really benefit from aggressive unboxing we
might need to shift from over-reliance on Smi operations, e.g.
when phi is unboxed we want to cascade that through and unbox
operations which are performed on it transitively. This requires
much more sophisticated algorithm and is outside of scope for this
change.
In AOT we in general treat all arithmetic operations as operations
over 64-bit int values so unboxing phis makes more sense.
As a result of this change we see small improvement in code size:
flutter_gallery_app_so_gzip_size -0.2392%
TEST=ci
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-release-x64-try
Change-Id: Iae9a16f353e53f649da4e665d2812ad47099a674
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/187860
Commit-Queue: Vyacheslav Egorov <vegorov@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
This CL removes asserts that prevented background compiler from doing class finalization.
It adds program_lock synchronization for when object properties are updated during class finalization.
It also encloses code instructions installation into safepoint scopes to ensure that no code is executed during installation.
Issue https://github.com/dart-lang/sdk/issues/36097
TEST=existing test suite
Change-Id: If297e44f51b187242eca2cdcfff066c8f6386d97
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/178163
Commit-Queue: Alexander Aprelev <aam@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Currently we have things called XPtr which are not what you get from ptr().
Old world:
handle->raw() returns RawObject* (tagged)
raw_obj->ptr() returns RawObject* (untagged)
After 6fe15f6df9:
handle->raw() returns ObjectPtr
obj_ptr->ptr() returns ObjectLayout*
New world:
handle->ptr() returns ObjectPtr
obj_ptr->untag() returns UntaggedObject*
TEST=ci
Change-Id: I6c7f34014cf20737607caaf84979838300d12df2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149367
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Siva Annamalai <asiva@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
When this flag is enabled, then the validity of real token positions are
checked in three places:
* FlowGraphChecker::VisitInstruction
* CodeSourceMapBuilder::BufferChangeLocation
* DescriptorList::AddDescriptor
The validity check ensures that, if the flow graph has an inlining
ID, that the instruction has an inlining ID and that any real token
position is a valid source offset for the appropriate script (found
via the inlining ID) by attempting to look up line and column.
This flag is disabled by default until existing issues with invalid
inlining IDs and token positions are resolved.
TEST=Enabled the flag manually to check that it caught invalid token
positions.
Bug: https://github.com/dart-lang/sdk/issues/44436
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-release-x64-try,vm-kernel-precomp-linux-product-x64-try
Change-Id: I86439db3661d976ac4ea608d132e3277425615d5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/175641
Reviewed-by: Martin Kustermann <kustermann@google.com>
For some reason constexpr seems to need a definition, because the linker
complains about not being able to find the symbol:
% tools/gn.py -ax64 -mdebug -d0
% tools/build.py -ax64 -mdebug
...
ld.lld: error: undefined symbol: dart::FlowGraphBuilderHelper::kPhiSelfReference
>>> referenced by constant_propagator_test.cc:53 (../../runtime/vm/compiler/backend/constant_propagator_test.cc:53)
...
We may also want to consider passing `-fmerge-all-constants` explicitly
in the future - though it is not standards compliant.
See also http://crbug.com/829795.
Change-Id: I1cc125a01751c8a83092b033e80afdcc591c7b92
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/144287
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>
So far we relied on our normal Dart tests to exercise and test TTS.
This CL adds concrete TTS unit tests, which directly construct the
values the TTS accepts via the calling convention (instance,
dst_type, instantiator tav, function tav), and allows us to test
* whether TTS handled the type test
* whether TTS was falling back to STC which handled the type test
* whether TTS (and STC) preserve the necessary registers
This CL also gets rid of TMP usage in TTS related code.
This CL also adds documentation about TTS to
runtime/docs/compiler/type_testing_stubs.md.
This CL also fixes two issues:
* handle all-dynamic null vector `as Foo<..., T, ...>`
* compare the actual type parameter value in `as Foo<..., T, ...>`
(instead of using type_class_id>)
There seem to be no major performance changes, some benchmarks change
positive/negative but many of them seem to be bi-modal.
Issue https://github.com/dart-lang/sdk/issues/40964
Issue https://github.com/dart-lang/sdk/issues/40736
Change-Id: Iad41e405fe693c67be6221a18e3dad03cc0a5f24
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/139461
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Régis Crelier <regis@google.com>
Three bugs were fixed:
1. BitVector::Equals was not fully fixed by the original CL.
2. We need to add old objects to the deferred marking queue during
RememberLiveTemporaries().
3. The thread being scanned in RestoreWriteBarrierInvariant may not
be scheduled, so we cannot use its store buffer block.
In addition, this changed uncovered another bug fixed in:
https://dart-review.googlesource.com/c/sdk/+/138960.
Original CL is in patchset 3.
This reverts commit 30a12a349e.
Change-Id: I36169b09563998ed5b3c3eac70ee0ebe78853e62
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/138920
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Samir Jindel <sjindel@google.com>
This reverts commit eff1a9ff97.
Reason for revert:
Causes flaky hits of RELEASE_ASSERT in marker.cc, see b/151131634.
Original change's description:
> Re-land "[vm] Aggressive write-barrier elimination."
>
> The original revision is in Patchset 3.
>
> Four bugs were fixed:
>
> 1. JoinEntryInstr::SuccessorCount() is not the correct way to get the
> number of successor blocks from the Join block;
> JoinEntryInstr::last_instruction()->SuccessorCount() must be used
> instead.
>
> 2. BitVector::Equals() was non-deterministically returning 'false'
> for equal vectors.
>
> 3. All blocks need to be processed at least once during the Analysis
> phase (not only in the SaveResults phase).
>
> 4. We were not removing write barriers from StoreIndexed instructions,
> even though we had support for it.
>
> This reverts commit 7fd8ad5a2d.
>
> Fixes https://github.com/dart-lang/sdk/issues/40780
>
> Change-Id: I9650ec2c547ec49cf88ca0524e14f6c245621f6a
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/138086
> Commit-Queue: Samir Jindel <sjindel@google.com>
> Reviewed-by: Martin Kustermann <kustermann@google.com>
> Reviewed-by: Ryan Macnak <rmacnak@google.com>
TBR=kustermann@google.com,rmacnak@google.com,sjindel@google.com
Change-Id: If9afd84465175fad2431405a97e9293c8bd5e476
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/138808
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>
The original revision is in Patchset 3.
Four bugs were fixed:
1. JoinEntryInstr::SuccessorCount() is not the correct way to get the
number of successor blocks from the Join block;
JoinEntryInstr::last_instruction()->SuccessorCount() must be used
instead.
2. BitVector::Equals() was non-deterministically returning 'false'
for equal vectors.
3. All blocks need to be processed at least once during the Analysis
phase (not only in the SaveResults phase).
4. We were not removing write barriers from StoreIndexed instructions,
even though we had support for it.
This reverts commit 7fd8ad5a2d.
Fixes https://github.com/dart-lang/sdk/issues/40780
Change-Id: I9650ec2c547ec49cf88ca0524e14f6c245621f6a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/138086
Commit-Queue: Samir Jindel <sjindel@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
This is a Dart-tailored implementation of the "row-displacement
dispatch table" technique for closed-world instance calls:
All interface targets in the program are grouped into selectors such
that all targets that could potentially be called from the same call
site have the same selector (currently just grouped by name).
Each selector is assigned a selector offset such that offset + classid
is unique for all selector/classid combinations where the class
implements the selector.
At every instance call site that has an interface target (i.e. where
the static type of the receiver is not dynamic), the selector offset +
receiver classid is computed and used as index into a global table of
entry points.
If the receiver can be null (as determined by the front-end TFA and the
VM type propagation), a null check is inserted before the call.
An arguments descriptor is provided (only) for selectors that need it
(those which have type parameters or optional/named parameters).
The dispatch table calls don't need the monomorphic entry code, so for
functions that are only called via dispatch table calls (i.e. never
called dynamically), the monomorphic entry code is left out.
Some future improvements to the table dispatch implementation are
mentioned in https://github.com/dart-lang/sdk/issues/40188
The table dispatch flag is disabled by default in this commit. A
separate commit enables the flag.
Change-Id: Ic2911742b4a2c9a8d3bc7df60605454cbe4c0714
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/126648
Commit-Queue: Aske Simon Christensen <askesc@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
This is a reland of https://dart-review.googlesource.com/c/sdk/+/113123
after stack overflow in the interpreter was fixed in https://dart-review.googlesource.com/c/sdk/+/117061
Original change's description:
Temporary setting of FLAG_enable_interpreter is avoided in the VM unit tests as
this flag is global and used by kernel service isolate while running tests.
Flipping this flag causes assertion failures in kernel isolate's background compiler
or infinite loop between LazyCompile stub and CompileFunction as AttachBytecode
doesn't set entry point to InterpretCall.
The less intrusive way to ensure compilation of functions in unit tests is to set
FLAG_compilation_counter_threshold to 0.
Change-Id: Ibbcf4b5bb0df558851c80cfa40a9a54f949dd187
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/117122
Reviewed-by: Régis Crelier <regis@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>
This adds in a version of the IL deserializer that doesn't actually do
any deserialization yet.
However, it adds in a couple of compile passes that passes the FlowGraph
for compiled functions through the serializer and deserializer. If the
deserialization step succeeds, then the FlowGraph stored in the
CompilerPassState is replaced with the new FlowGraph for the rest of the
compiler.
Also change the default zone handling in the FlowGraphSerializer to use
the zone for the current thread, instead of the zone stored in the
FlowGraph, so that it is appropriately affected by StackZone uses.
Bug: https://github.com/dart-lang/sdk/issues/36882
Change-Id: I8fa1c7af434f724ccec45ddb73263f84730af5b0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/113184
Commit-Queue: Teagan Strickland <sstrickl@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Aart Bik <ajcbik@google.com>
This reverts commit beee442625.
Reason for revert: StackOverflow on language_2/deep_nesting_expression_test/01 in interpreted mode.
Original change's description:
> [vm/bytecode] Switch kernel service dill to bytecode if building Dart SDK with --bytecode
>
> Temporary setting of FLAG_enable_interpreter is avoided in the VM unit tests as
> this flag is global and used by kernel service isolate while running tests.
> Flipping this flag causes assertion failures in kernel isolate's background compiler
> or infinite loop between LazyCompile stub and CompileFunction as AttachBytecode
> doesn't set entry point to InterpretCall.
>
> The less intrusive way to ensure compilation of functions in unit tests is to set
> FLAG_compilation_counter_threshold to 0.
>
> Change-Id: Ia46ff8d03d66ab8b147b9d89336548c4a9c29f5d
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/113123
> Commit-Queue: Alexander Markov <alexmarkov@google.com>
> Reviewed-by: Régis Crelier <regis@google.com>
TBR=rmacnak@google.com,alexmarkov@google.com,regis@google.com
Change-Id: I67cd03a56f9a2d29aa6597d38779e77ca3a16b18
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/113480
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Temporary setting of FLAG_enable_interpreter is avoided in the VM unit tests as
this flag is global and used by kernel service isolate while running tests.
Flipping this flag causes assertion failures in kernel isolate's background compiler
or infinite loop between LazyCompile stub and CompileFunction as AttachBytecode
doesn't set entry point to InterpretCall.
The less intrusive way to ensure compilation of functions in unit tests is to set
FLAG_compilation_counter_threshold to 0.
Change-Id: Ia46ff8d03d66ab8b147b9d89336548c4a9c29f5d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/113123
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Régis Crelier <regis@google.com>
The FlowGraph on which to run is available at each method call site, so
we don't need to store it.
This also avoids issues in the future if we ever rebuild the FlowGraph
entirely during compilation, since we won't be using a BlockScheduler
object that caches an older version of the FlowGraph.
Change-Id: I5653e1230131fbada3fe01cfa6c1ac37846fccb0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/113024
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Teagan Strickland <sstrickl@google.com>
When provided, the opcode is implicitly inserted before each provided
MatchCode, which simplifies test cases that contain kMoveGlob or
kMoveParallelMoves before all other types of entries.
Change-Id: I51119fb66176cb54e1588687aa53b8d4ce80d9b5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/101290
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Teagan Strickland <sstrickl@google.com>
Based on the unified typed data layout, we can now inline accesses to
typed data interface classes if there are no 3rd party implementations
of those interfaces.
Example: If a receiver is of type Uint8List and we call `[]` or `[]=` we
will inline the byte access.
Instead of changing the existing inliner / call specializer we add this
as an extra pass: If the inliner / call specializer infer that the
receiver type is e.g. internal typed data then it will perform the
inlining itself using more optimized LoadIndexed instruction.
=> Only if those existing optimization passes have not been able to inline
the access will we, later on in the compilation pipeline, run a
specialized pass which will inline the accesses using LoadUntagged +
LoadIndexed (which is slightly less efficient than using only LoadIndexed
for internal typed data).
As a first step this is only done for AOT.
For ease of writing tests matching certain IR graphs this CL also adds a
IR pattern matcher.
Issue https://github.com/dart-lang/sdk/issues/35154
Cq-Include-Trybots: luci.dart.try:vm-canary-linux-debug-try, vm-dartkb-linux-debug-x64-try, vm-dartkb-linux-release-x64-try, vm-kernel-asan-linux-release-x64-try, vm-kernel-checked-linux-release-x64-try, vm-kernel-linux-debug-ia32-try, vm-kernel-linux-debug-simdbc64-try, vm-kernel-linux-debug-x64-try, vm-kernel-linux-product-x64-try, vm-kernel-linux-release-ia32-try, vm-kernel-linux-release-simarm-try, vm-kernel-linux-release-simarm64-try, vm-kernel-linux-release-simdbc64-try, vm-kernel-linux-release-x64-try, vm-kernel-optcounter-threshold-linux-release-ia32-try, vm-kernel-optcounter-threshold-linux-release-x64-try, vm-kernel-precomp-android-release-arm-try, vm-kernel-precomp-bare-linux-release-simarm-try, vm-kernel-precomp-bare-linux-release-simarm64-try, vm-kernel-precomp-bare-linux-release-x64-try, vm-kernel-precomp-linux-debug-x64-try, vm-kernel-precomp-linux-product-x64-try, vm-kernel-precomp-linux-release-simarm-try, vm-kernel-precomp-linux-release-simarm64-try, vm-kernel-precomp-linux-release-x64-try, vm-kernel-precomp-obfuscate-linux-release-x64-try, vm-kernel-precomp-win-release-simarm64-try, vm-kernel-precomp-win-release-x64-try, vm-kernel-reload-linux-debug-x64-try, vm-kernel-reload-linux-release-x64-try, vm-kernel-reload-rollback-linux-debug-x64-try, vm-kernel-reload-rollback-linux-release-x64-try, vm-kernel-win-debug-ia32-try, vm-kernel-win-debug-x64-try, vm-kernel-win-product-x64-try, vm-kernel-win-release-ia32-try, vm-kernel-win-release-x64-try
Change-Id: I5f2e01a55f46b473f64478b05679f65b9fd7c4c8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/98662
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
The two existing places where IR is built are changed to use this new
helper. It supports running normal JIT/AOT passes as well as a
user-specified set of passes.
In order to allow vm/cc tests to make assertions about AOT pipeline this CL
enables the DART_PRECOMPILER define in run_vm_tests binary (similar to
gen_snapshot, run_vm_tests has now JIT and AOT support)
Change-Id: Ib51a024a81e0291e89d20860b8b9a2762611426c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/98482
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Reviewed-by: Aart Bik <ajcbik@google.com>
Alexander Markov