39b8f7bef4
Before this CL kernel tags had specialized tags that was marked by the single high bit, then using the three lowest bits for a value: 128 + value = 0b10000xxx 136 + value = 0b10001xxx 144 + value = 0b10010xxx So the numbers from 128 to 151 is taken by this scheme, but because of the high bit marking stuff being special we can't really use 152-256. This CL shifts the specialized tags up so it instead uses the 3 highest bits as a marker while still using the lower 3 bits for the value: 224 + value = 0b11100xxx 232 + value = 0b11101xxx 240 + value = 0b11110xxx This takes up 224-247 and leave 248-255 unused. It would let us use 128-223 though. (If we eventually need more we can probably remove one of the specialized ranges (SpecializedVariableSet isn't used very much in previously sampled dill files) and use 4 bits for tagging). Additionally, a tool to print free tags has been added (via binary.md), and the "binary version is in sync with VM" test has been prepared for version > 99. TEST=Existing tests. Change-Id: If77b12cee6fc3801628dd67dc40afbb018ec8a61 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/284302 Reviewed-by: Martin Kustermann <kustermann@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Jens Johansen <jensj@google.com> |
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| binary.md | ||
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| PRESUBMIT.py | ||
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| README.md | ||
Dart Kernel
Dart Kernel is a small high-level language derived from Dart. It is designed for use as an intermediate format for whole-program analysis and transformations, and to be consumed by codegen and execution backends.
The kernel language has an in-memory representation in Dart and can be serialized as binary or text.
Both the kernel language and its implementations are unstable and are under development.
This package contains the Dart part of the implementation and contains:
- A transformable IR for the kernel language
- Serialization of kernel code
Note: The APIs in this package are in an early state; developers should be careful about depending on this package. In particular, there is no semver contract for release versions of this package. Please depend directly on individual versions.
See ast.dart for the in-memory IR, or binary.md for a description of the binary format. For now, the textual format is very ad-hoc and cannot be parsed back in.