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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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If wasm-opt is run with no passes, warn, as we've gotten reports that people
assume a tool called "wasm-opt" should optimize automatically (but we follow
llvm's opt convention of not doing so).
Add a --quiet (-q) flag that suppresses this minor warning, and the other minor
warning where there is no output file.
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See emscripten-core/emscripten#9381 for rationale.
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See emscripten-core/emscripten#9206, the asyncify names can need complex escaping, so this provides an escape hatch.
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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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The lists are comma separated, but the names can have internal commas since they are human-readable. This adds awareness of bracketing things, so void foo(int, double) is parsed as a single function name, properly.
Helps emscripten-core/emscripten#9128
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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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The blacklist means "functions here are to be ignored and not instrumented, we can assume they never unwind." The whitelist means "only these functions, and no others, can unwind." I had hoped such lists would not be necessary, since Asyncify's overhead is much smaller than the old Asyncify and Emterpreter, but as projects have noticed, the overhead to size and speed is still significant. The lists give power users a way to reduce any unnecessary overhead.
A slightly tricky thing is escaping of names: we escape names from the names section (see #2261 #1646). The lists arrive in human-readable format, so we escape them before comparing to the internal escaped names. To enable that I refactored wasm-binary a little bit to provide the escaping logic, cc @yurydelendik
If both lists are specified, an error is shown (since that is meaningless). If a name appears in a list that is not in the module, we show a warning, which will hopefully help people debug typos etc. I had hoped to make this an error, but the problem is that due to inlining etc. a single list will not always work for both unoptimized and optimized builds (a function may vanish when optimizing, due to duplicate function elimination or inlining).
Fixes #2218.
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After some discussion this seems like a less confusing name: what the pass does is "asyncify" code, after all.
The one downside is the name overlaps with the old emscripten "Asyncify" utility, which we'll need to clarify in the docs there.
This keeps the old --bysyncify flag around for now, which is helpful for avoiding temporary breakage on CI as we move the emscripten side as well.
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