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The purpose of the datacount section is to pre-declare how many data
segments there will be so that engines can allocate space for them
and not have to back patch subsequent instructions in the code section
that refer to them. Once we use IRBuilder in the binary parser, we will
have to have the data segments available by the time we parse
instructions that use them, so eagerly construct the data segments when
parsing the datacount section.
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Don't directly import names from shared.py and support.py, and use
prefixes instead. Also this reorders imports based on PEP
recommendation.
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pep8 specifies 4 space indentation. The use of 2 spaces is, I believe
a historical anomaly where certain large organizations such as google
chose 2 over 4 and have yet to make the switch.
Since there isn't too much code in binaryen today it seems reasonable to
make the switch.
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I fixed flatten.bin.txt which seems to have just had some corrupted data, and I removed some fancy unicode from the spec comments tests, which I'm not sure it's important enough to figure out how to fix.
Fixes #1691
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This reverts commit cb2d63586c08a3dd194d2b733ceb3f5051c081f8.
The issues with feature validation were mostly resolved in #1993, and
this PR finishes the job by adding feature flags to wasm-as to avoid
emitting the DataCount section when bulk-memory is not enabled.
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Its presence was causing validation errors in the Emscripten test
suite. This should be reverted once the default feature set is no
longer All.
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* DataCount section
Read the DataCount section and verify that it agrees with the data
section. Also emit the DataCount section when bulk-memory is enabled
and there are a nonzero number of segments. Factor out some shared
unit test code.
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