wasmonkey/src/wasm/wasmLoader.js

Write and run C code inside JavaScript file.

const fs = require("fs");
const settings = require("../../settings");


const WASM_CONFIGS = {
    wasmMemory: new WebAssembly.Memory({initial:256, maximum: 256}),
    wasmTable: new WebAssembly.Table({
        initial: 1,
        maximum: 1,
        element: "anyfunc"
    }),
    wasmLibArgs: {
        __handle_stack_overflow: ()=>{},
        emscripten_resize_heap: ()=>{},
        __lock: ()=>{}, 
        __unlock: ()=>{},
        memory: this.wasmMemory, 
        table: this.wasmTable 
    },
    wasmInfo: {
        env: this.wasmLibArgs,
        wasi_snapshot_preview1: this.wasmLibArgs
    }
}

const load = () => {
    const filePath = 
            settings.rootFolder+"/"+settings.execFolderName+"/"+settings.execFileName+".wasm";
    let wasmBuffer;
    try {
        wasmBuffer = fs.readFileSync(filePath);
    }
    catch(err) {
        console.log(err)
    }

    let instance = new WebAssembly.Instance(new WebAssembly.Module(wasmBuffer), WASM_CONFIGS.wasmInfo);
    return instance.exports
}






module.exports = {load}

// const fs = require("fs");
// const { exec } = require("child_process");

// const CONFIG_FOLDER_NAME = "malanka";
// const PARSED_FILE_SUBSUFFIX = ".mal.js";
// const CODE_SECTION_TAG = "@malanka {"
// const EXECUTION_FILE_PATH = CONFIG_FOLDER_NAME+"/execute.c";

// const filesToParse = [];
// let resultCodeTemplate = 
// `
// #include "emscripten.h"


// `;

// const checkForFile = path => {
//     let isDirectory = false;
//     try {
//         isDirectory = fs.lstatSync(path).isDirectory();
//     }
//     catch(err) {
//         console.log(err)
//     }
//     if(path.replace("./","") !== CONFIG_FOLDER_NAME) {
//         if(!isDirectory) {
//             let filename = path.split("/");
//             filename = filename[filename.length-1];
//             if(filename.includes(PARSED_FILE_SUBSUFFIX)) {
//                 filesToParse.push(path);
//             }
//         }
//         else {
//             iterateFiles(path);
//         }
//     }
// }

// const iterateFiles = path => {
//     var files = fs.readdirSync(path);
//     files.forEach(file => {
//         checkForFile(path+"/"+file);
//     });
// }

// const analazeTagSection = codeText => {
//     let codeLines = codeText.split("\n");
//     let isTagSpecialCodeSectionOpened = false;
//     let isSingleStrLiteral = false;
//     let isDoubleStrLiteral = false;
//     let openedFigureBracketsCount = 0;
//     codeLines.forEach(line => {
//         line = line.trim();
//         if(isTagSpecialCodeSectionOpened) {
//             // for "}" bracket of tag special code section 
//             if(!isSingleStrLiteral && !isDoubleStrLiteral && openedFigureBracketsCount===1) {
//                 if(line.trim()==="}") {
//                     isTagSpecialCodeSectionOpened = false;
//                     openedFigureBracketsCount = 0;
//                 }
//             }
//             isSingleStrLiteral = (line.split("'").length-1)%2 ? !isSingleStrLiteral : isSingleStrLiteral;
//             isDoubleStrLiteral = (line.split('"').length-1)%2 ? !isDoubleStrLiteral : isDoubleStrLiteral;
//             openedFigureBracketsCount += (line.split("{").length-1)-(line.split("}").length-1);
            
//             if(isTagSpecialCodeSectionOpened)
//                 resultCodeTemplate += line+"\n"
//         }
//         else {
//             let codeSectionTagIndex = line.indexOf(CODE_SECTION_TAG);
//             if (codeSectionTagIndex != -1) {
//                 // check for comments befor
//                 let appendStr = line.substring(0,codeSectionTagIndex);
//                 if(!appendStr.includes("//")) {
//                     isTagSpecialCodeSectionOpened = true;
//                     openedFigureBracketsCount = 1;
//                 }
//             }
//         }
//     });
// }

// const parseFilesTagsCode = _ => {
//     filesToParse.forEach(file => {
//         try {
//             const data = fs.readFileSync(file, 'utf8')
//             analazeTagSection(data);
//         } catch (err) {
//             console.error(err)
//         }
//         return;
//     });
// }

// const writeToExecutionFile = _ => {
//     try {
//         const data = fs.writeFileSync(EXECUTION_FILE_PATH, resultCodeTemplate)
//       } catch (err) {
//         console.error(err)
//       }
// }

// const execute = _ => {
//     let compileCommand = `emcc ${EXECUTION_FILE_PATH} -o ${CONFIG_FOLDER_NAME}/compiled.wasm -s WASM=1 --no-entry`;
//     exec(compileCommand, (error, stdout, stderr) => {
//         if (error) {
//             console.log(`error: ${error.message}`);
//             return;
//         }
//         if (stderr) {
//             console.log(`stderr: ${stderr}`);
//             return;
//         }
//     });
// }






// let wasmExports = null;

// let wasmMemory = new WebAssembly.Memory({initial: 256, maximum: 256});

// let wasmTable = new WebAssembly.Table({
//     'initial': 1,
//     'maximum': 1,
//     'element': 'anyfunc'
// });

// let asmLibraryArg = { 
//     "__handle_stack_overflow": ()=>{},
//     "emscripten_resize_heap": ()=>{},
//     "__lock": ()=>{}, 
//     "__unlock": ()=>{},
//     "memory": wasmMemory, 
//     "table": wasmTable 
// };

// var info = {
//     'env': asmLibraryArg,
//     'wasi_snapshot_preview1': asmLibraryArg
// };

// function factorialTest(n) {
//     return n !== 0 ? n*factorialTest(n-1) : 1;
// }

// function goFactorial(count, n) {
//     for (let i = 0; i < count; i++)
//         factorialTest(n);
// }

// function loadWasm(){
//     const wasmBuffer = fs.readFileSync('./malanka/compiled.wasm');
//     WebAssembly.instantiate(wasmBuffer,info).then(wasmModule => {
//         let wasm_exports = wasmModule.instance.exports;
//         let n = 10;
//         let start_ts = Date.now();
//         goFactorial(10e6,15);
//         goFactorial(10e6,15);
//         goFactorial(10e6,15);
//         // wasm_exports["goFactorial"](10e6,15)
//         // wasm_exports["goFactorial"](10e6,15)
//         // wasm_exports["goFactorial"](10e6,15)
//         console.log("time: " + (Date.now()-start_ts));
//     });

// }

// // iterateFiles(".");
// // parseFilesTagsCode();
// // writeToExecutionFile();
// execute();
// loadWasm();

// // recurisiveFiles('parser.js');