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Clement Skau 4d5055805f [VM/FFI] Adds FFI leaf calls. 
This CL adds FFI leaf calls by adding `lookupFunction(.., isLeaf)`
and `_asFunctionInternal(.., isLeaf)`, which generate FFI leaf calls.
These calls skip a lot of the usual frame building and generated <->
native transition overhead.

`benchmark/FfiCall/` shows a 1.1x - 4.3x speed-up between the regular
FFI calls and their leaf call counterparts (JIT, x64, release).

TEST=Adds `tests/ffi{,_2}/vmspecific_leaf_call_test.dart`. Tested FFI tests.

Closes: https://github.com/dart-lang/sdk/issues/36707
Cq-Include-Trybots: luci.dart.try:vm-precomp-ffi-qemu-linux-release-arm-try,vm-ffi-android-release-arm64-try,vm-ffi-android-release-arm-try,vm-ffi-android-product-arm64-try,vm-ffi-android-product-arm-try,vm-ffi-android-debug-arm64-try,vm-ffi-android-debug-arm-try,vm-kernel-linux-debug-ia32-try,vm-kernel-win-debug-ia32-try,vm-kernel-win-debug-x64-try,vm-kernel-win-release-x64-try,vm-kernel-mac-debug-x64-try,vm-kernel-precomp-nnbd-mac-release-simarm64-try,vm-kernel-precomp-android-release-arm64-try,vm-kernel-precomp-asan-linux-release-x64-try,vm-kernel-precomp-linux-release-simarm_x64-try,vm-kernel-precomp-obfuscate-linux-release-x64-try,vm-kernel-precomp-ubsan-linux-release-x64-try,vm-kernel-precomp-tsan-linux-release-x64-try,vm-kernel-precomp-win-release-x64-try,vm-precomp-ffi-qemu-linux-release-arm-try,vm-kernel-reload-rollback-linux-debug-x64-try,vm-kernel-reload-linux-debug-x64-try
Bug: https://github.com/dart-lang/sdk/issues/36707
Change-Id: Id8824f36b0006bf09951207bd004356fe6e9f46e
Cq-Do-Not-Cancel-Tryjobs: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/179768
Commit-Queue: Clement Skau <cskau@google.com>
Reviewed-by: Daco Harkes <dacoharkes@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
2021-05-21 11:12:02 +00:00
..
ffi [VM/FFI] Adds FFI leaf calls. 2021-05-21 11:12:02 +00:00
sample_extension [native_extensions] Convert uri to path so that on Windows native extension loading works. 2021-04-01 03:22:35 +00:00
.gitignore [samples] Duplicate samples prior to NNBD migration 2020-11-24 18:50:28 +00:00
README [samples] Duplicate samples prior to NNBD migration 2020-11-24 18:50:28 +00:00
samples_2.status [test] Apply simarm64 status file entries to simarm64c. 2021-02-25 21:18:02 +00:00

README 

This directory contains sample Dart programs.

The samples in this directory have not been migrated to non-nullable by
default. Please see directory `samples` for migrated samples.