Function instrument

deps/v8/tools/wasm/wasm-import-profiler.js:10–38

(imports, profile)

  let instanceCounter = 0;

  function instrument(imports, profile) {
    let orig_imports = imports;
    return new Proxy(imports, {
      get: (obj, module_name) => {
        let orig_module = orig_imports[module_name];
        return new Proxy(orig_module, {
          get: (obj, item_name) => {
            let orig_func = orig_module[item_name];
            let item = orig_func;
            if (typeof orig_func == "function") {
              var full_name = module_name + "." + item_name;
              print("instrumented " + full_name);
              profile[full_name] = {name: full_name, count: 0, total: 0};
              item = function profiled_func(...args) {
                var before = performance.now();
                var result = orig_func(...args);
                var delta = performance.now() - before;
                var data = profile[full_name];
                data.count++;
                data.total += delta;
                return result;
              }
            }
            return item;
          }
        })
      }
    });
  }

  function dumpProfile(profile) {
    let array = [];