Function craftInvokerFunction

frontend/src/assets/js/decrypt.js:3023–3130

(humanName, argTypes, classType, cppInvokerFunc, cppTargetFunc)

        });
      }};
  function craftInvokerFunction(humanName, argTypes, classType, cppInvokerFunc, cppTargetFunc) {
      // humanName: a human-readable string name for the function to be generated.
      // argTypes: An array that contains the embind type objects for all types in the function signature.
      //    argTypes[0] is the type object for the function return value.
      //    argTypes[1] is the type object for function this object/class type, or null if not crafting an invoker for a class method.
      //    argTypes[2...] are the actual function parameters.
      // classType: The embind type object for the class to be bound, or null if this is not a method of a class.
      // cppInvokerFunc: JS Function object to the C++-side function that interops into C++ code.
      // cppTargetFunc: Function pointer (an integer to FUNCTION_TABLE) to the target C++ function the cppInvokerFunc will end up calling.
      var argCount = argTypes.length;
  
      if (argCount < 2) {
          throwBindingError("argTypes array size mismatch! Must at least get return value and 'this' types!");
      }
  
      var isClassMethodFunc = (argTypes[1] !== null && classType !== null);
  
      // Free functions with signature "void function()" do not need an invoker that marshalls between wire types.
  // TODO: This omits argument count check - enable only at -O3 or similar.
  //    if (ENABLE_UNSAFE_OPTS && argCount == 2 && argTypes[0].name == "void" && !isClassMethodFunc) {
  //       return FUNCTION_TABLE[fn];
  //    }
  
      // Determine if we need to use a dynamic stack to store the destructors for the function parameters.
      // TODO: Remove this completely once all function invokers are being dynamically generated.
      var needsDestructorStack = false;
  
      for (var i = 1; i < argTypes.length; ++i) { // Skip return value at index 0 - it's not deleted here.
          if (argTypes[i] !== null && argTypes[i].destructorFunction === undefined) { // The type does not define a destructor function - must use dynamic stack
              needsDestructorStack = true;
              break;
          }
      }
  
      var returns = (argTypes[0].name !== "void");
  
      var argsList = "";
      var argsListWired = "";
      for (var i = 0; i < argCount - 2; ++i) {
          argsList += (i!==0?", ":"")+"arg"+i;
          argsListWired += (i!==0?", ":"")+"arg"+i+"Wired";
      }
  
      var invokerFnBody =
          "return function "+makeLegalFunctionName(humanName)+"("+argsList+") {\n" +
          "if (arguments.length !== "+(argCount - 2)+") {\n" +
              "throwBindingError('function "+humanName+" called with ' + arguments.length + ' arguments, expected "+(argCount - 2)+" args!');\n" +
          "}\n";
  
      if (needsDestructorStack) {
          invokerFnBody +=
              "var destructors = [];\n";
      }
  
      var dtorStack = needsDestructorStack ? "destructors" : "null";
      var args1 = ["throwBindingError", "invoker", "fn", "runDestructors", "retType", "classParam"];
      var args2 = [throwBindingError, cppInvokerFunc, cppTargetFunc, runDestructors, argTypes[0], argTypes[1]];