Daco Harkes
d27f166b75
This CL enables tree shaking of `Struct` sub classes by simulating the native behavior in Dart code. We call the struct constructors in let expressions where FFI trampolines are created which allocate these struct objects in native code. This way TFA is instructed about the native behavior. The VM recognizes these constructor calls as dead code and removes them. For more info see go/dart-ffi-struct-treeshaking. Closes: https://github.com/dart-lang/sdk/issues/38721 This CL fixes the types on the generated #fromTypedDataBase constructors. Also, this CL also cleans up the struct naming: * _addressOf -> _typedDataBase * _fromPointer -> _fromTypedDataBase * #pointer -> #typedDataBase These cleanups are not split into a separate CL to prevent updating the .expect files multiple times. Finally, this CL enables running a single transformer test through: `dart pkg/vm/test/transformations/type_flow/transformer_test.dart name` TEST=pkg/vm/testcases/transformations/type_flow/transformer/ffi_struct_constructors.dart TEST=tests/ffi(_2)/function_callbacks_structs_by_value_generated_test.dart TEST=tests/ffi(_2)/function_structs_by_value_generated_test.dart Change-Id: I418d0d73bc86b234dfe5b7b04ae726c33d2b8aeb Cq-Include-Trybots: luci.dart.try:vm-precomp-ffi-qemu-linux-release-arm-try,vm-ffi-android-debug-arm64-try,vm-kernel-precomp-asan-linux-release-x64-try,vm-kernel-precomp-dwarf-linux-product-x64-try,vm-kernel-precomp-linux-debug-x64-try,vm-kernel-precomp-obfuscate-linux-release-x64-try,analyzer-analysis-server-linux-try,analyzer-linux-release-try,dart-sdk-linux-try,vm-kernel-reload-rollback-linux-debug-x64-try,vm-kernel-reload-linux-debug-x64-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/193661 Commit-Queue: Daco Harkes <dacoharkes@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com>
This package hosts VM specific Dart code and helper scripts.