Function asanify

tools/acorn-optimizer.mjs:1251–1281

(ast)

// Add ASan check to direct HEAP* loads/stores.
// That lets ASan cover JS too.
function asanify(ast) {
  recursiveWalk(ast, {
    FunctionDeclaration(node, c) {
      if (node.id.type === 'Identifier' && node.id.name === 'establishStackSpace') {
        // skip establishStackSpace, because it sets up variables used by ASan itself
      } else {
        c(node.body);
      }
    },
    AssignmentExpression(node, c) {
      const target = node.left;
      const value = node.right;
      c(value);
      if (isHEAPAccess(target)) {
        // Instrument a store.
        asanifyTransform(target, '___asan_storeN');
      } else {
        c(target);
      }
    },
    MemberExpression(node, c) {
      c(node.property);
      if (!isHEAPAccess(node)) {
        c(node.object);
      } else {
        // Instrument a load.
        asanifyTransform(node, '___asan_loadN');
      }
    },
  });
}

function multiply(value, by) {
  return {