All files / src/generator loop.js

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// @flow
import mapSyntax from './map-syntax';
import mergeBlock from './merge-block';
import opcode from '../emitter/opcode';
import type { GeneratorType } from './flow/types';
 
const generateLoop: GeneratorType = (node, parent) => {
  const block = [];
  const mapper = mapSyntax(parent);
 
  // First param in a for loop is assignment expression or Noop if it's a while loop
  const [initializer, condition, ...body] = node.params;
 
  block.push.apply(block, [initializer].map(mapper).reduce(mergeBlock, []));
  block.push({ kind: opcode.Block, params: [0x40] });
  block.push({ kind: opcode.Loop, params: [0x40] });
 
  block.push.apply(block, [condition].map(mapper).reduce(mergeBlock, []));
  block.push({ kind: opcode.i32Eqz, params: [] });
  block.push({ kind: opcode.BrIf, params: [1] });
 
  block.push.apply(block, body.map(mapper).reduce(mergeBlock, []));
 
  block.push({ kind: opcode.Br, params: [0] });
 
  block.push({ kind: opcode.End, params: [] });
  block.push({ kind: opcode.End, params: [] });
 
  return block;
};
 
export default generateLoop;