For the arrays of the Int/Uint/Float/Double types this has been
implemented straight in the ffi_patch.dart file and `elements` returns a
typed-data list view on the original data backing the array.
The Bool and Pointer arrays return helper classes from their `elements`
getter. These helper classes implement the `List` interface utilizing
the `operator []` implementation of the underlying arrays. This is also
implemented directly in the ffi_patch.dart file.
The `elements` getter for array arrays is rewritten in the CFE
(use_sites.dart) to instantiate a helper class to which the size of a
single element of the array is passed (this information is not available
in ffi_patch.dart, hence the rewrite in the CFE). The helper class
implements the `List` interface and performs some pointer arithmetic
with the provided element size to implement its methods.
The `elements` getters for struct and union arrays are also rewritten in
the CFE to instantiate a helper class to which a constructor tearoff for
instantiating the underlying struct/union type is passed. The helper
class also implements the `List` interface and uses the provided
constructor tearoff to create instantiated structs/unions of the
elements in the list.
Last, but not least, the `elements` getter for abi-specific integer
arrays is also rewritten in the CFI to instantiate a helper class to
which a closure is provided to load abi specific integers from the
underlying array data structure.
TEST=tests/ffi/array_compound_elements_test.dart
TEST=tests/ffi/array_primitive_elements_generated_test.dart
CoreLibraryReviewExempt: Dart VM only.
Bug: https://github.com/dart-lang/sdk/issues/45508
Change-Id: I211a42174057c39632c6a363d4e8e6fa8e94e801
Cq-Include-Trybots: dart/try:vm-aot-android-release-arm64c-try,vm-aot-android-release-arm_x64-try,vm-aot-asan-linux-release-x64-try,vm-aot-linux-debug-x64-try,vm-aot-linux-debug-x64c-try,vm-aot-mac-release-arm64-try,vm-aot-mac-release-x64-try,vm-aot-msan-linux-release-x64-try,vm-aot-obfuscate-linux-release-x64-try,vm-aot-optimization-level-linux-release-x64-try,vm-aot-tsan-linux-release-x64-try,vm-aot-ubsan-linux-release-x64-try,vm-aot-win-debug-arm64-try,vm-aot-win-debug-x64-try,vm-aot-win-debug-x64c-try,vm-appjit-linux-debug-x64-try,vm-asan-linux-release-arm64-try,vm-asan-linux-release-x64-try,vm-checked-mac-release-arm64-try,vm-eager-optimization-linux-release-ia32-try,vm-eager-optimization-linux-release-x64-try,vm-ffi-android-debug-arm-try,vm-ffi-android-debug-arm64c-try,vm-ffi-mac-debug-simarm64_arm64-try,vm-ffi-qemu-linux-release-arm-try,vm-ffi-qemu-linux-release-riscv64-try,vm-fuchsia-release-arm64-try,vm-fuchsia-release-x64-try,vm-linux-debug-ia32-try,vm-linux-debug-x64-try,vm-linux-debug-x64c-try,vm-mac-debug-arm64-try,vm-mac-debug-x64-try,vm-msan-linux-release-arm64-try,vm-msan-linux-release-x64-try,vm-reload-linux-debug-x64-try,vm-reload-rollback-linux-debug-x64-try,vm-tsan-linux-release-arm64-try,vm-tsan-linux-release-x64-try,vm-ubsan-linux-release-arm64-try,vm-ubsan-linux-release-x64-try,vm-win-debug-arm64-try,vm-win-debug-x64-try,vm-win-debug-x64c-try,vm-win-release-ia32-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/414821
Commit-Queue: Daco Harkes <dacoharkes@google.com>
Reviewed-by: Daco Harkes <dacoharkes@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Lasse Nielsen <lrn@google.com>
Daco Harkes