Extend the test runner to `wback`

[manuranga]

Current test runner in nballerina/test dir compiles and run ll files. Extend this to run wat files.

[poorna2152]

• wasm-interp tool when run with the command $ wasm-interp test.wasm --run-all-exports --trace did not produce an output and needed a .wasmfile to run the tool. So in order to run the tests the .watfiles should be converted to .wasm format first and then run through the wasm-interp tool.

• The tool wasmer provides a tool which can take a .wat as the input and runs it without the explicit need to convert to wasm format. wasmer main.wat -i add 10 5

• Wasmer can also generate a .exe file for the .wat file.

• However it doesn't seem like they provide a command line flag to import functions. Importing function can be done like this. Either through a python, C/C++, Rust or Go script.

[manuranga]

Wasmer looks like a good choice to me, please also evaluate other options. Can we use V8?

[poorna2152]

Added three new files.

• runwcheck.sh
• wsub.mk
• main.js

.wat file is converted to .wasm using the wasm-opt tool in Binaryen. The generated wasm file is run through the main.js file which provides console.log as an import function. Since the wasm-opt tool is used currently the path to it is hard-coded in the wsub.mk file. The make test wat=true command is used to run the tests for the wback. make test wat=false command can be used to run the tests for nback. Run the compiler with --outWat flag to generate webassembly. bal run -- [path-to-file] --outWat

[poorna2152]

Updated the makefiles to include following commands.

• make testwat: run wasm tests
• make testll: run ll tests
• make test: run both wasm and ll tests.
• make -j2 test: run both wasm and ll tests parallely.

wasm-opt tool is used to convert wat to wasm. To find the path to the wasm-opt created a shell script which search the $HOME directory for a wasm-opt tool. Updated the Github action files to,

• Download and extract the Binaryen tool releases
• Download and install NodeJs.