Extend default fiber stack size tentatively

packages/npm-packages/ruby-wasm-wasi/src/browser.ts

@@ -70,7 +70,15 @@ export const DefaultRubyVM = async (
 }> => {
   await init();
 
-  const wasi = new WASI({});
+  const wasi = new WASI({
+    env: {
+      // FIXME(katei): setjmp consumes a LOT of stack now, so we extend
+      // default Fiber stack size as well as main stack size allocated
+      // by wasm-ld's --stack-size. The ideal solution is to reduce
+      // stack consumption in setjmp.
+      "RUBY_FIBER_MACHINE_STACK_SIZE": "16777216"
+    }
+  });
   const vm = new RubyVM();
 
   const imports = wasi.getImports(rubyModule) as WebAssembly.Imports;

packages/npm-packages/ruby-wasm-wasi/src/node.ts

@@ -2,7 +2,15 @@ import { WASI } from "wasi";
 import { RubyVM } from "./index";
 
 export const DefaultRubyVM = async (rubyModule: WebAssembly.Module) => {
-  const wasi = new WASI();
+  const wasi = new WASI({
+    env: {
+      // FIXME(katei): setjmp consumes a LOT of stack now, so we extend
+      // default Fiber stack size as well as main stack size allocated
+      // by wasm-ld's --stack-size. The ideal solution is to reduce
+      // stack consumption in setjmp.
+      "RUBY_FIBER_MACHINE_STACK_SIZE": "16777216"
+    }
+  });
   const vm = new RubyVM();
   const imports = {
     wasi_snapshot_preview1: wasi.wasiImport,

packages/npm-packages/ruby-wasm-wasi/test-e2e/integrations/browser-script.spec.ts

@@ -10,26 +10,31 @@ if (!process.env.RUBY_NPM_PACKAGE_ROOT) {
     setupProxy(context);
   })
 
+  const resolveBinding = async (page: Page, name: string) => {
+    let checkResolved;
+    const resolvedValue = new Promise((resolve) => {
+      checkResolved = resolve;
+    })
+    await page.exposeBinding(name, async (source, v) => {
+      checkResolved(v);
+    });
+    return async () => await resolvedValue
+  }
+
   test.describe('data-eval="async"', () => {
-    test("JS::Object#await returns value", async ({ page, context }) => {
-      let checkResolved;
-      const resolvedValue = new Promise((resolve) => {
-        checkResolved = resolve;
-      })
-      await page.exposeBinding('checkResolved', async (source, v) => {
-        checkResolved(v);
-      });
+    test("JS::Object#await returns value", async ({ page }) => {
+      const resolve = await resolveBinding(page, "checkResolved");
       await page.setContent(`
       <script src="https://cdn.jsdelivr.net/npm/ruby-head-wasm-wasi@latest/dist/browser.script.iife.js"></script>
       <script type="text/ruby" data-eval="async">
       require "js"
       JS.global.checkResolved JS.global[:Promise].resolve(42).await
       </script>
     `)
-      expect(await resolvedValue).toBe(42);
+      expect(await resolve()).toBe(42);
     })
 
-    test("JS::Object#await throws error on default attr", async ({ page, context }) => {
+    test("JS::Object#await throws error on default attr", async ({ page }) => {
       await page.setContent(`
       <script src="https://cdn.jsdelivr.net/npm/ruby-head-wasm-wasi@latest/dist/browser.script.iife.js"></script>
       <script type="text/ruby">
@@ -40,5 +45,17 @@ if (!process.env.RUBY_NPM_PACKAGE_ROOT) {
       const error = await page.waitForEvent("pageerror")
       expect(error.message).toMatch(/please ensure that you specify `data-eval="async"`/)
     })
+
+    test("default stack size is enough to require 'json'", async ({ page }) => {
+      const resolve = await resolveBinding(page, "checkResolved");
+      await page.setContent(`
+      <script src="https://cdn.jsdelivr.net/npm/ruby-head-wasm-wasi@latest/dist/browser.script.iife.js"></script>
+      <script type="text/ruby" data-eval="async">
+      require 'json'
+      JS.global.checkResolved "ok"
+      </script>
+     `)
+      expect(await resolve()).toBe("ok");
+    })
   })
 }