This CL fixes TFA summary collector to use right-hand side value as the
result of SuperPropertySet expression instead of result of setter invocation.
Change-Id: Ie2388387645eeec95096ab797e2718b7e031131b
Reviewed-on: https://dart-review.googlesource.com/48300
Reviewed-by: Martin Kustermann <kustermann@google.com>
This CL adds tree shaking transformation into TFA transformer, replacing
simple DropMethodBodiesVisitor. In addition to removing bodies of
unreachable members, tree shaker is able to remove unused classes, typedefs
and member declarations, and replace unreachable calls with 'throw'.
Total(CodeSize) of flutter_gallery in --release mode
before: 11,671,369
after: 11,499,694
https://github.com/dart-lang/sdk/issues/30480
Change-Id: I966cf222eb9725b7a75dd193ac479436b9b9b4c3
Reviewed-on: https://dart-review.googlesource.com/46942
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
In Dart, if initializer throws an exception, a static non-const field
will have a null value, even if result of initializer is non-nullable.
This CL fixes TFA to make static non-const fields with initializer
nullable in order to correctly handle this case.
Change-Id: Ib451927b3da508c18ea43fcd0533066fb129a45e
Reviewed-on: https://dart-review.googlesource.com/46577
Reviewed-by: Zach Anderson <zra@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>
* Introduce --tfa option in gen_kernel and 'useGlobalTypeFlowAnalysis'
parameter in compileToKernel(), which is used in Flutter's frontend
server.
* Split entry_points_extra.json into 2 parts: common to all embedders
and specific to a standalone VM (entry_points_extra_standalone.json).
* Extract generation of entry points JSON files into a separate .gni
file, introduce action to generate entry points JSON using
gen_snapshot instead of dart_bootstrap (required for Flutter), and
action to copy checked-in extra entry points file.
Issue: https://github.com/dart-lang/sdk/issues/30480
Change-Id: Ie0af9d7128d7fc0e3a9d623fd3c1589e87c83f5c
Reviewed-on: https://dart-review.googlesource.com/43884
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Zach Anderson <zra@google.com>
This CL adds auto-generation of entry points JSON file for standalone VM
during build (in runtime_kernel target, as it is only used for
kernel-based transformation).
pkg/vm/tool/precompiler2 script is changed to automatically pass
auto-generated entry points to gen_kernel.
New option --entry-points is added to pkg/vm/bin/gen_kernel.dart in order to
specify custom entry points files.
Checked-in entry_points.json is still used for testing and in gen_kernel
if --entry-points is not specified.
Issue: https://github.com/dart-lang/sdk/issues/30480
Change-Id: I39c4461e48763f40d7565656dc33e23fc5d9c2cb
Reviewed-on: https://dart-review.googlesource.com/42521
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Zach Anderson <zra@google.com>
This CL changes incoming argument types of raw (opaque, untracked) calls
in type flow analysis (TFA) from static parameter types to 'dynamic'.
Currently, raw calls are used to approximate calls from native code to
entry points and calls through tear-offs. Using static parameter types
is not correct for raw calls as incoming argument types should not include
the effect of strong mode argument type checks inside the body of a
method. This change has almost no impact on the results of analysis
because intersection with static parameter types is already performed when
applying a summary.
To fill out the remaining gap, static types of fields are now taken
into account in TFA: type of an incoming value is intersected with a static
field type in _FieldValue.setValue().
Also, this CL includes a fix for handling cyclic type parameters in TFA
(this problem appears on language_2/cyclic_type_variable_test test as
soon as TFA starts looking at static types of fields).
Issue: https://github.com/dart-lang/sdk/issues/30480
Change-Id: Ib79f1399e6c086445a61acc22a24a5e37bf481e6
Reviewed-on: https://dart-review.googlesource.com/42820
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
This CL revises implementation of concrete types and set types in
global type flow analysis. For concrete types, unique comparable
class identifiers are assigned. SetType, instead of storing elements
in a Set, stores them in a List ordered by class identifiers.
This makes comparison, union and intersection of set types linear of
number of elements.
Issue: https://github.com/dart-lang/sdk/issues/30480
Change-Id: I85a2aa7e550fd5708352bdca515bf5cb5dc221d1
Reviewed-on: https://dart-review.googlesource.com/42120
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>
This CL adds special case for FutureOr<T> type (which is a union
of Future<T> and T) into type flow analysis.
As type flow analysis doesn't retain information about generic type
arguments yet, FutureOr<T> is treated as AnyType for now.
Issue: https://github.com/dart-lang/sdk/issues/30480
Change-Id: Ieb4d862b5a993fe46c9662d9bcb0e1f06058a166
Reviewed-on: https://dart-review.googlesource.com/40463
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Implemented more efficient way to iterate ClassSet in class_hierarchy.dart,
ClassSet becomes Iterable<Class>. This considerably improves speed of
ClosedWorldClassHierarchy.getSingleTargetForInterfaceInvocation() and
CHA-based devirtualization.
Time of CHA-based devirtualization on Flutter Gallery reduced
from ~13.4s to ~1.2s.
Also, ClassHierarchy used in devirtualization is configured to ignore
ambiguous supertypes to avoid crashes on Flutter Gallery.
Change-Id: Iaca251ca268aad3d8bb652247650096f19c25839
Reviewed-on: https://dart-review.googlesource.com/38960
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
This relands 75a9579ea0.
The approach works as follows:
Step 1: Kernel transform. Under the closed world assumption compute the
set of selectors dispatched dynamically, then mark all procedures that don't
match any of those selectors as 'not-dispatched-dynamically'.
Step 2: VM backend. When building IR for a function if this function was
marked as not-dispatched-dynamically then omit type checks for any parameter
that is not marked as generic-covariant-impl, as such arguments are guaranteed
to be checked on the caller side (by front-end).
+------------------------+------------+----------+-----------+--------------+
| benchmark | baseline | current | with opt | improved by |
+------------------------+------------+----------+-----------+--------------+
| stock_layout_iteration | 2366.3786 | 2724.3 | 2562.75 | -5.93% |
| stock_build_iteration | 3824.3 | 4914.8 | 4681 | -4.76% |
+------------------------+------------+----------+-----------+--------------+
* Flutter gallery Instructions size is reduced by 11% (8748720 bytes to 7846368 bytes).
Baseline is at 6196496 bytes.
Alternatively to annotating individual procedures, I considered annotating Program node
with a set of dynamically dispatched selectors. Decoding and passing this information
around proved to be quite cumbersome in the "streaming" world, so I opted for a simpler
approach where all individual procedures are annotated.
Bug: https://github.com/dart-lang/sdk/issues/3179
Change-Id: I2f32a609e3872c74d5ae7bbd97555453aaedf15f
Reviewed-on: https://dart-review.googlesource.com/38125
Commit-Queue: Samir Jindel <sjindel@google.com>
Reviewed-by: Samir Jindel <sjindel@google.com>
This reverts commit 75a9579ea0.
Reason for revert: function_subtype_bound_closure7_test fails in darkp
Original change's description:
> [vm/kernel/aot] Skip unnecessary type checks on parameters of instance methods.
>
> The approach works as follows:
>
> Step 1: Kernel transform. Under the closed world assumption compute the
> set of selectors dispatched dynamically, then mark all procedures that don't
> match any of those selectors as 'not-dispatched-dynamically'.
>
> Step 2: VM backend. When building IR for a function if this function was
> marked as not-dispatched-dynamically then omit type checks for any parameter
> that is not marked as generic-covariant-impl, as such arguments are guaranteed
> to be checked on the caller side (by front-end).
>
> # Performance Impact
>
> +------------------------+------------+----------+-----------+--------------+
> | benchmark | baseline | current | with opt | improved by |
> +------------------------+------------+----------+-----------+--------------+
> | stock_layout_iteration | 2366.3786 | 2724.3 | 2562.75 | -5.93% |
> | stock_build_iteration | 3824.3 | 4914.8 | 4681 | -4.76% |
> +------------------------+------------+----------+-----------+--------------+
>
> * Flutter gallery Instructions size is reduced by 11% (8748720 bytes to 7846368 bytes).
> Baseline is at 6196496 bytes.
>
> # Alternative Implementations
>
> Alternatively to annotating individual procedures, I considered annotating Program node
> with a set of dynamically dispatched selectors. Decoding and passing this information
> around proved to be quite cumbersome in the "streaming" world, so I opted for a simpler
> approach where all individual procedures are annotated.
>
> Change-Id: I363db6d5dd1138fe25917646313c16d0b213c3b4
> Reviewed-on: https://dart-review.googlesource.com/37822
> Commit-Queue: Vyacheslav Egorov <vegorov@google.com>
> Reviewed-by: Alexander Markov <alexmarkov@google.com>
> Reviewed-by: Samir Jindel <sjindel@google.com>
TBR=vegorov@google.com,alexmarkov@google.com,sjindel@google.com
Change-Id: I0fd6bf3e6edfc3e605da2b996f9a0da6c409d01c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/37802
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
The approach works as follows:
Step 1: Kernel transform. Under the closed world assumption compute the
set of selectors dispatched dynamically, then mark all procedures that don't
match any of those selectors as 'not-dispatched-dynamically'.
Step 2: VM backend. When building IR for a function if this function was
marked as not-dispatched-dynamically then omit type checks for any parameter
that is not marked as generic-covariant-impl, as such arguments are guaranteed
to be checked on the caller side (by front-end).
# Performance Impact
+------------------------+------------+----------+-----------+--------------+
| benchmark | baseline | current | with opt | improved by |
+------------------------+------------+----------+-----------+--------------+
| stock_layout_iteration | 2366.3786 | 2724.3 | 2562.75 | -5.93% |
| stock_build_iteration | 3824.3 | 4914.8 | 4681 | -4.76% |
+------------------------+------------+----------+-----------+--------------+
* Flutter gallery Instructions size is reduced by 11% (8748720 bytes to 7846368 bytes).
Baseline is at 6196496 bytes.
# Alternative Implementations
Alternatively to annotating individual procedures, I considered annotating Program node
with a set of dynamically dispatched selectors. Decoding and passing this information
around proved to be quite cumbersome in the "streaming" world, so I opted for a simpler
approach where all individual procedures are annotated.
Change-Id: I363db6d5dd1138fe25917646313c16d0b213c3b4
Reviewed-on: https://dart-review.googlesource.com/37822
Commit-Queue: Vyacheslav Egorov <vegorov@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Samir Jindel <sjindel@google.com>
* _ReceiverTypeBuilder class is introduced to create receiver type more
efficiently (without using union operations and creating intermediate
types).
* Certain tracing prints are hidden behind kPrintTrace flag to avoid
expensive string interpolations.
* Also, added debugging flag for dumping class hierarchy.
This CL reduces analysis time of Flutter gallery by ~2x.
Change-Id: Ia918b88a4d902895e77aac306dc6a5cf9cecad14
Reviewed-on: https://dart-review.googlesource.com/37644
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>
This CL fixes the case when an invocation is invalidated in the
middle of processing. In such case, its result should not be retained
and it should be re-processed again.
Also:
* _WorkList.pending Set is replaced with LinkedList (reduces analysis time).
* ClassHierarchy is configured to ignore ambiguous supertypes.
* _AssertionError._throwNew entry point is added (as it is implicitly
inserted by flow graph builder).
Change-Id: Ie2d5d29352a5463fbe602910f9ae7f6f77a917d7
Reviewed-on: https://dart-review.googlesource.com/37126
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
* Invocation handlers and InvocationAnalyzer are revised to reduce
complexity of the code, improve precision and efficiency of analysis.
* Invocation now has 2 subclasses: DirectInvocation and
DispatchableInvocation; processing of invocations is moved to these
subclasses and simplified.
DirectInvocation is responsible for processing particular
methods and fields, while DispatchableInvocation processes polymorphic
calls by collecting targets and accurate receiver types for each target,
and delegating to DirectInvocations for processing of each target.
* Dynamic tear-offs and dynamic calls via getter/field are
supported.
* Invalidation of field initializers is implemented.
* Implicit 'return null' at the end of a function is correctly
detected.
Issue: https://github.com/dart-lang/sdk/issues/30480
Change-Id: I3d2ea69fbc95e3eb9aee244ee909016dfcf79bee
Reviewed-on: https://dart-review.googlesource.com/34507
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
This is a pure refactoring which extracts the base class for
Devirtualization transformation. It is needed to add a new implementation
of devirtualization later, in addition to the current CHA-based
implementation.
Change-Id: Ifbc6160150a842f5322cf5aea13a7c2180507c96
Reviewed-on: https://dart-review.googlesource.com/30620
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
* The package:kernel/transformations/precompiler.dart is moved to
package:vm and split into 2 libraries: metadata/direct_call and
transformations/cha_devrtualization.
* Fasta 'target-options' command line argument and
package:kernel/target/implementation_option.dart are cleaned up
as they are no longer used.
Issue: https://github.com/dart-lang/sdk/issues/30480
Change-Id: I21a7b6bc62a036a9694e62a5dae890f6120d79ab
Reviewed-on: https://dart-review.googlesource.com/26360
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Alexander Markov