[REQUEST] Web Assembly JIT compiler

[aschrein]

It is possible to get native jitted code for web assembly(wasm) out of javascript engines like SpiderMonkey and V8. Here is an example.

I think it makes sense to add wat(wasm text)-to-x86 explorer in the future to study optimization opportunities. One could use CE to generate wat and then copy-paste that wat in the second window and get native assembly.

One way to get native assembly is to run v8 with --print-wasm-code option. There's also a way using v8's internals to get custom output.

Adding that would involve installing wasm tools for (wat -> wasm) conversion and one of the javasctipt engines. I personally tried using v8 and it wasn't difficult in terms of installing/compiling from source compared to llvm/clang. Although that would also involve pulling some google internal tools like depot_tools.

Thanks,
Anton

[gautam1168]

Please look at the issue #264
and this discussion #4700

Im adding a webassembly thing to it right now. I am adding a way to do it through c++ -> clang -> wasm -> d8

Although I could also use wabt to do it from .wat files directly. But I have had wabt fail me before this, so Ill do that later. I could do spydermonkey but I haven't ever compiled it before, unlike d8. But I would like to compare spydermonkey and d8 too.

[gautam1168]

I have this working right now where I have added the bytes of the compiled add function directly to the javascript file. You can see both the webassembly code generated by the baseline compiler and then the optimized code here:

[gautam1168]

I got webassembly working using clang and c in my local env. You can make a tree view and have a js file with a special string. The javascript compiler class will then compile the c file to wasm and put the bytes in the javascript file before giving it to d8.