Previously, the VM used a linear array to cache previous instantiations
of a type arguments object. Now once the cache hits a certain number
of occupied entries, the VM changes to using a hash-based approach.
The InstantiateTypeArguments stubs have not yet been updated to
traverse the hash-based cache, so once the cache has grown too large,
all attempts at instantiations, even those that are in the cache, go to
the runtime. Thus, until the stubs are updated, this is only an
improvement if the cost of traversing the linear cache dominates the
cost of making a runtime call. Our benchmarks see a ~40% performance
regression for hash-based caches of size 100 but a ~400% performance
improvement for hash-based caches of size 1000. Thus, we currently
split the difference and set the maximum size of linear caches to 500.
TEST=vm/cc/TypeArguments_Cache_ManyInstantiations
Bug: https://github.com/dart-lang/sdk/issues/48344
Change-Id: I7f1376943523bb5bcd8b175cfb1936779ea73d60
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-dwarf-linux-product-x64-try,vm-kernel-precomp-linux-product-x64-try,vm-kernel-precomp-linux-release-x64-try,vm-kernel-precomp-nnbd-mac-release-arm64-try,vm-kernel-precomp-nnbd-linux-release-simarm_x64-try,vm-kernel-precomp-linux-release-simarm-try,vm-kernel-precomp-nnbd-linux-release-x64-try,vm-kernel-precomp-nnbd-linux-release-simarm64-try,vm-kernel-precomp-nnbd-linux-debug-simriscv64-try,vm-kernel-precomp-tsan-linux-release-x64-try,vm-kernel-tsan-linux-release-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/265325
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Tess Strickland <sstrickl@google.com>
Instead of using an integer literal use constexpr popcount
function instead.
The misalignment causes an incorrect generation of a call
to a shared write barrier stub for the last allocatable register
on ARM64.
Reported by Lin Zuojian <zuojian.lzj@alibaba-inc.com>
TEST=ci
Change-Id: I69ce32da958573be0ec8967e462f8a378a778a28
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/254401
Commit-Queue: Slava Egorov <vegorov@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Per breaking change #45451 we are removing support for dart-ext:
style native extensions from the Dart VM.
This CL removes the associated VM code, tests and samples. It also ports
a single test which used dart-ext: import to use FFI instead.
TEST=ci
Bug: https://github.com/dart-lang/sdk/issues/45451
Change-Id: Iae984bce32baf29a950b5de1323939006a217b94
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/212050
Commit-Queue: Slava Egorov <vegorov@google.com>
Reviewed-by: Daco Harkes <dacoharkes@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
This relands https://dart-review.googlesource.com/c/sdk/+/205633
but without renaming TARGET_OS_IPHONE to DART_TARGET_OS_IPHONE.
It also changes uses of TARGET_OS_IOS to
DART_TARGET_OS_MACOS_IOS to be consistent with the rest of the
VM.
TargetConditionals.h for XCode 13 defines several
TARGET_OS_* preprocessor symbols that confuse the
Dart build. There is probably a more targeted fix
for this, but renaming the symbols that Dart uses
will also prevent this problem if more symbols
are added to the platform headers in the future.
See: https://github.com/dart-lang/sdk/issues/46499
TEST=It builds.
Change-Id: Ie775c19dd23cfdf5f65e5ebc6ee4ec3a561676fa
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/205860
Commit-Queue: Zach Anderson <zra@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
This reverts commit aa9201b76b.
Reason for revert: blocks G3 roll (b/192627187)
Original change's description:
> [vm] Prefix HOST_OS_* and TARGET_OS_* with DART_
>
> TargetConditionals.h for XCode 13 defines several
> TARGET_OS_* preprocessor symbols that confuse the
> Dart build. There is probably a more targeted fix
> for this, but renaming the symbols that Dart uses
> will also prevent this problem if more symbols
> are added to the platform headers in the future.
>
> See: https://github.com/dart-lang/sdk/issues/46499
>
> TEST=It builds.
> Change-Id: I3b33a03b4a9a14b76d55fe12f8cdefec4b3c3664
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/205633
> Commit-Queue: Zach Anderson <zra@google.com>
> Reviewed-by: Siva Annamalai <asiva@google.com>
TBR=rmacnak@google.com,zra@google.com,asiva@google.com
Change-Id: Ib06ca418c7e9d3b4df62c72c033cd39f462f7667
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/205790
Reviewed-by: Slava Egorov <vegorov@google.com>
Commit-Queue: Slava Egorov <vegorov@google.com>
This removes the need for the image snapshot writer to know the
starting memory offset of any ELF sections. Instead, relocation
and symbol information are recorded in the ELF writer to be
resolved during finalization.
This is a step towards being able to reorder sections in the
ELF memory space for better packing into segments. Delaying
relocation and symbol resolution also moves towards merging
multiple text or data sections into a single section if desired.
In addition, this CL removes redundant rows from the DWARF line
number program matrix to reduce the size of debugging information.
Originally, rows were written for every PC offset visited by the
CodeSourceMap. However, no row is needed if the source information
(file, line, column) is the same as the previously written row.
There are also fixes to Utils::{IsInt,IsUint,IsAbsoluteUint} to
allow N >= the bit size of the value.
TEST=Refactoring, so existing tests.
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-debug-simarm_x64-try,vm-kernel-precomp-linux-debug-x64-try,vm-kernel-precomp-linux-release-simarm-try,vm-kernel-precomp-linux-release-simarm64-try,vm-kernel-precomp-dwarf-linux-product-x64-try
Change-Id: I09f87cea214bca06b6fca60cd66138dae6da9e83
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/203766
Commit-Queue: Tess Strickland <sstrickl@google.com>
Reviewed-by: Slava Egorov <vegorov@google.com>
TargetConditionals.h for XCode 13 defines several
TARGET_OS_* preprocessor symbols that confuse the
Dart build. There is probably a more targeted fix
for this, but renaming the symbols that Dart uses
will also prevent this problem if more symbols
are added to the platform headers in the future.
See: https://github.com/dart-lang/sdk/issues/46499
TEST=It builds.
Change-Id: I3b33a03b4a9a14b76d55fe12f8cdefec4b3c3664
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/205633
Commit-Queue: Zach Anderson <zra@google.com>
Reviewed-by: Siva Annamalai <asiva@google.com>
This is a reland of 5909fd111d
Does a large refactoring on the V8 snapshot profile writer
to clean things up, add more debugging support, and to fix
the problems that surfaced during the original landing.
Other changes:
Changes Serializer::CreateArtificialNodeIfNeeded() to create
artificial nodes for Code objects and immutable arrays.
Fixes CodeSerializationCluster::Trace() to only push needed parts of
discarded code objects, instead of tracing them like full code objects.
Adds test cases to v8_snapshot_profile_writer_test that exercise
the following situations (both separately and together):
* Non-symbolic stack traces are enabled and code and function objects
are dropped when not needed at runtime.
* Creation of the dispatch table is disabled.
TEST=vm/dart{,_2}/v8_snapshot_profile_writer_test
Original change's description:
> [vm] Fix V8 snapshot profile handling of the dispatch table.
>
> Fixes https://github.com/dart-lang/sdk/issues/45702.
>
> TEST=Tests listed in the issue above.
>
> Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-debug-x64-try
> Change-Id: Ibf5e3ccf3828c01f9dda47de360314dabe8cb8a9
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/195272
> Reviewed-by: Daco Harkes <dacoharkes@google.com>
> Commit-Queue: Tess Strickland <sstrickl@google.com>
Change-Id: I8e7030267fe190079a8f68d00fe20bf7170e5719
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-debug-x64-try,vm-kernel-precomp-linux-product-x64-try,vm-kernel-precomp-mac-release-simarm64-try,vm-kernel-precomp-linux-debug-x64c-try,vm-kernel-precomp-obfuscate-linux-release-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/195513
Reviewed-by: Daco Harkes <dacoharkes@google.com>
Commit-Queue: Tess Strickland <sstrickl@google.com>
Rationale:
Useful in the future when compiler wants to constant fold
operations related to leading/trailing/counting (non)zeros.
https://github.com/dart-lang/sdk/issues/38346
Change-Id: I158aca125d3a15019af20ca7c2a516b74e4d84c2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/119920
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Commit-Queue: Aart Bik <ajcbik@google.com>
Rationale:
Useful to implement the simulator, but also useful
in the future when compiler wants to constant fold
operations related to bit reversal.
https://github.com/dart-lang/sdk/issues/38346
Change-Id: I2f09ba6b1897202b5c07a2cff771afd7bbc99495
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/119703
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Aart Bik <ajcbik@google.com>
Rationale:
Mostly an AOT 64-bit improvement of DIV and MOV by constant
on X64_64. Also a few minor supporting optimizations
that were missed. With unit tests.
https://github.com/dart-lang/sdk/issues/37789
Change-Id: I2f12d6a24bbe983324521d7d4d778f20b34d18a1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/114901
Commit-Queue: Aart Bik <ajcbik@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Change some static_libraries to source_sets to make ODR violations link-time errors.
This is needed to enable (stop suppressing) -fvisibility=hidden in Fuchsia product builds.
Change-Id: I699cec8d4b516beab9cebf9db0a522a7ff99e004
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/99822
Reviewed-by: Zach Anderson <zra@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Internal builds in Google are catching this as an error.
I'm guarding it because I assume we might support building using other
compilers.
Change-Id: I665099cace9c6a40d737c471dd1b0fdb326fea39
Reviewed-on: https://dart-review.googlesource.com/c/91162
Commit-Queue: Siva Annamalai <asiva@google.com>
Reviewed-by: Siva Annamalai <asiva@google.com>
Add missing rename of CountOneBits in ARM assembler.
Change-Id: I735da06343248573a1b049109ebc2bf0d1634960
Reviewed-on: https://dart-review.googlesource.com/18504
Reviewed-by: Zach Anderson <zra@google.com>
