Port to web assembly

[krczapla]

I added HYPERSCAN_WASM32 cmake option. If enabled, it sets appropriate headers and compile definitions that enables WASM compilation;

I conditionaly replace some of the codeblocks that are not compilable into WASM. This blocks fetch cpu information in order to enable some extra features (that how I understand it). In the WASM conext there is no "CPU" hence no CPU info;

In order to build wasm hyperscan you need to do following:

1. Prepare environment

Install and activate emscripten sdk. Follow steps in this instruction: https://emscripten.org/docs/getting_started/downloads.html. Use version that supports wasm exceptions proposal e.g. 3.1.16. Install nodejs version that supports wasm exceptions e.g. v16.16.0.

2. Configure Hyperscan

cd <where-you-want-to-build-hyperscan>
mkdir <build-dir>
cd <build-dir>
emcmake cmake -DFAT_RUNTIME=FALSE -DBUILD_EXAMPLES=OFF -DHYPERSCAN_WASM32=ON -DHYPERSCAN_EMSCRIPTEN_BOOST=ON -S ../ -B .

3. Build hscheck

emmake make -j<jobs> hscheck

4. Run hscheck

node --experimental-wasm-simd --experimental-wasm-eh ./<build-dir>/bin/hscheck.js

[Litch1-v]

@krczapla thanks for your job,I build it successfully,but the hscheck.wasm size up to 90M,is there any way to reduce its size?

[strawgate]

Did you have to do anything special to get emcmake to find boost? Im getting errors that i need to specify boost_root but the normal hyperscan build instructions work just fine