The purpose of the wasm_js_compatibility target is to facilitate experiments with a JS compatibility mode for Dart2Wasm. Initially, we're just going to focus on typed data, but this will give us a place to experiment with moving List and String to JS as well.
In addition, someday down the road we hope to experiment with two additional compatibility changes:
1) Exclusively using double for all Dart numbers
2) Allowing undefined to flow as null.
The two major benefits of this approach are:
1) Much faster JS interop
2) To make it easier to bring up Dart2JS applications on Dart2Wasm
The only downside will be access overhead on the Wasm side, but the JS builtins proposal could potentially bring us close to parity with Wasm builtins someday.
Tested: Wasm specific trivial refactor.
Change-Id: I2c09426b6999507c1de6e584e9bc7072a088bda9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/313240
Commit-Queue: Joshua Litt <joshualitt@google.com>
Reviewed-by: Ömer Ağacan <omersa@google.com>
Reviewed-by: William Hesse <whesse@google.com>
This adds basic infrastructure for a stringref implementation in
dart2wasm:
- A `--[no-]stringref` option to the compiler
- An option in the `WasmTarget`, controlling the name of the target
- Separate sets of patch files for the two targets
- Separate platform dill files for the two targets
For now, the patch file contents are the same, and the compiler flag
is not used by the backend (only by the `dart2wasm` script to select
the appropriate platform dill file). Both of these will change as the
implementation progresses.
Tested: ci + manual check that the option selects the correct dill
Change-Id: I2c9bb95ba06fd3de3f7007703ef545e3f0c728ba
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/310621
Commit-Queue: Aske Simon Christensen <askesc@google.com>
Reviewed-by: Ömer Ağacan <omersa@google.com>
The `dartaotruntime` is built in `product` mode even when we do a release build. This CL wires up a product flag so we always build the Dart2Wasm product snapshot when creating the SDK.
Change-Id: Ic8c6a6da180a47a19ba818d7c449f712c9e60123
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/264887
Reviewed-by: Slava Egorov <vegorov@google.com>
Commit-Queue: Joshua Litt <joshualitt@google.com>
Reviewed-by: Jake Macdonald <jakemac@google.com>
This CL introduces a new kernel-to-kernel pass in Wasm backend to
compile `FfiNative`-annotated external functions to external functions
with `wasm:import` pragmas.
The new pass `WasmFfiNativeTransformer` extends `FfiNativeTransformer`.
Some `FfiNativeTransformer` methods made public to allow reuse in the
pass.
The conversion works like this: when we see a member like:
@FfiNative<Int8 Function(Int8, Int8)>("ffi.addInt8")
external int addInt8(int a, int b);
We generate a Wasm import using Wasm ABI types according to emscripten
calling conventions:
@pragma('wasm:import', 'ffi.addInt8')
external static WasmI32 addInt8_$import(WasmI32 a, WasmI32 b);
and convert the original member (`addInt8()`) to a wrapper function that
calls the Wasm import, converting the arguments and return values to
Dart types:
static int addInt8(int a, int b) {
return WasmI32.toIntSigned(
addInt8_$import(
WasmI32::int8FromInt(a),
WasmI32::int8FromInt(b),
));
}
Build, test, and CI changes:
- Test runner now uses `// SharedObjects=...` lines in dart2wasm tests
to pass extra Wasm modules to d8 command used to run the tests.
Support for `// SharedObjects=...` lines were already used in
native/AOT FFI tests, not added in this CL. We just start to use those
lines in dart2wasm tests.
- dart2wasm gn file updated with a target "test_wasm_modules" that
builds FFI test Wasm modules to Wasm using emcc (emscripten C
compiler).
- CI dart2wasm_hostasserts configuration updated to copy the Wasm files
generated by the "test_wasm_modules" target to the shards.
TEST=tests/web/wasm/ffi_native_test
Change-Id: I6527fe4e2ca2b582e16d84fee244e9cbe6dee307
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/252822
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: Ömer Ağacan <omersa@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Aske Simon Christensen <askesc@google.com>
This adds a --platform= option to dart2wasm to read the SDK libraries
from that dill file instead of compiling them from source every time.
If the option is not given, the SDK libraries are compiled, like before.
Also adds a "dart2wasm" build target, which will build the dart2wasm
platform dill and compile dart2wasm to two AOT snapshots (with and
without asserts). The dart2wasm scripts in sdk/bin are updated to run
via these snapshots and use this platform dill.
This speeds up test runs for the dart2wasm-hostasserts-linux-x64-d8
configuration by approximately 45x.
Change-Id: If2c7750a6eb39725310745f887792784d0dfc583
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/243624
Commit-Queue: Aske Simon Christensen <askesc@google.com>
Reviewed-by: William Hesse <whesse@google.com>
Reviewed-by: Joshua Litt <joshualitt@google.com>
