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* show a proper error for an empty asm2wasm input
* handle end of input in processExpressions in binary reading
* memory segment sizes should be unsigned
* validate input in wasm-ctor-eval
* update tests
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* When we eval a ctor, don't just nop the function body that no longer needs to be executed, also remove the export (as we report the ctor being evalled, and the outside will no longer call it).
* Run the pass to remove unused global things. This can usually remove evalled ctors (unless something else happens to call them, which can't happen normally as LLVM wouldn't use a ctor in another place, but e.g. duplicate function merging might merge a ctor with another function).
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* fix wasm-ctor-eval, we need to look for the STACKTOP etc. imports, they may not be named, if this build is not with -g
* pack memory after ctor evalling, since we merge it up which is less efficient
* do some useful opts after ctor-evalling, to clean things up
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Add wasm-ctor-eval, which evaluates functions at compile time - typically static constructor functions - and applies their effects into memory, saving work at startup. If we encounter something we can't evaluate at compile time in our interpreter, stop there.
This is similar to ctor_evaller.py in emscripten (which was for asm.js).
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