Menelusuri Kesalahan Modul WebAssembly
Manfaatkan alat pengembang peramban dan teknik penelusuran kesalahan lainnya untuk memeriksa serta memperbaiki masalah pada aplikasi WASM Anda.
Menelusuri Kesalahan Modul WebAssembly adalah pelajaran WebAssembly (WASM) for High Performance Apps gratis di CoddyKit. Ini adalah pelajaran 3 dari 4. Kamu bisa membaca pelajaran lengkapnya di bawah secara gratis — lalu praktikkan langsung di browser dengan editor kode bawaan dan tutor AI 24/7. Ini adalah bagian dari jalur belajar WebAssembly (WASM) for High Performance Apps, dan progresmu tersinkronisasi di web dan aplikasi CoddyKit. Kursus WebAssembly (WASM) for High Performance Apps mencakup 4 pelajaran total.
Bagian dari pelajaran ini belum diterjemahkan dan ditampilkan dalam bahasa Inggris.
Debugging WASM: An Overview
Ever wondered how to peek inside your WebAssembly code while it runs? Debugging WASM lets you find and fix issues in your high-performance modules.
It's a bit different from debugging pure JavaScript, but modern browser developer tools offer powerful capabilities to help you out.
Browser DevTools: Sources Tab
Your browser's developer tools are your best friend for WASM debugging. In Chrome, open DevTools (F12 or Cmd+Option+I).
- Navigate to the Sources tab.
- Look for your WASM module in the file tree, often under
wasm://or similar. - Without source maps, you'll see raw WebAssembly text format – which is very hard to read!
Source Maps: From WASM to Source
Debugging raw WebAssembly text is incredibly tough! Source maps are special files that link the compiled WASM code back to your original C, C++, or Rust source code.
When present, your browser can display your original source files, allowing you to debug them directly, just like JavaScript.
Rust & wasm-pack Source Maps
When compiling Rust to WASM, tools like wasm-pack can automatically generate source maps. The key is to compile in debug mode.
A simple Rust function that adds one to a number:
// src/lib.rs
#[no_mangle]
pub extern "C" fn add_one(num: i32) -> i32 {
// This function adds 1 to the input number.
// It will be exported from the WASM module.
num + 1
}Loading WASM & Source Maps
Let's see how a browser loads a WASM module. When compiled with source maps (e.g., wasm-pack build --target web --dev), the browser uses them to show your original Rust/C/C++ files in the Sources tab.
Here's how JavaScript loads a tiny, conceptual WASM module:
async function loadAndRunWasm() {
// This is a conceptual WASM binary for 'add(a, b) => a + b'
const wasmCode = new Uint8Array([
0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00, 0x01, 0x07, 0x01, 0x60,
0x02, 0x7f, 0x7f, 0x01, 0x7f, 0x03, 0x02, 0x01, 0x00, 0x07, 0x07, 0x01,
0x03, 0x61, 0x64, 0x64, 0x00, 0x00, 0x0a, 0x09, 0x01, 0x07, 0x00, 0x20,
0x00, 0x20, 0x01, 0x6a, 0x0b
]);
const wasmModule = await WebAssembly.instantiate(wasmCode, {});
const add = wasmModule.instance.exports.add;
console.log("WASM add(5, 7):", add(5, 7)); // Expected: 12
}
loadAndRunWasm();Pausing Execution with Breakpoints
Just like JavaScript, you can set breakpoints directly in your original C/C++/Rust source files shown in the Sources tab of your browser's DevTools.
- Click on the line number in the gutter where you want to pause execution.
- When your WASM code executes that line, the browser will pause, letting you inspect variables and the call stack.
Inspect Variables, Memory & Stack
When execution pauses at a breakpoint, you gain powerful insights:
- Scope pane: View local variables and function arguments, often with their original names if source maps are good.
- Memory Inspector: Use the dedicated 'Memory' tab or right-click a memory address to inspect WASM's linear memory buffer.
- Call Stack pane: See the sequence of function calls that led to the current point, including both JavaScript and WASM frames.
Step-by-Step Execution
Once paused at a breakpoint, use the debugger controls to navigate your code line by line:
- Step Over (F10): Execute the current line and move to the next.
- Step Into (F11): Dive into a function call on the current line.
- Step Out (Shift+F11): Finish executing the current function and return to where it was called.
- Resume (F8): Continue execution until the next breakpoint or the program ends.
Debugging JS-WASM Interaction
Often, bugs occur at the boundary where JavaScript calls WASM functions or vice-versa. Set breakpoints in both your JavaScript and WASM code.
You can step seamlessly between JS and WASM execution frames in the DevTools call stack, making it easy to trace data flow and identify issues in the interop layer.
Debugging Knowledge Check
Test your understanding of WebAssembly debugging!
Debugging WASM: Recap
Today, you learned how to leverage browser developer tools to debug your WebAssembly applications. We covered:
- Using source maps to see original source code.
- Setting breakpoints and stepping through execution.
- Inspecting variables, memory, and the call stack.
- Debugging interactions between JavaScript and WASM.
Mastering these techniques is crucial for building robust and performant WASM applications. Keep practicing!
Belajar WebAssembly (WASM) for High Performance Apps dengan tutor AI — gratis
Tulis dan jalankan kode asli di browser kamu, dapatkan bantuan instan dari tutor AI 24/7, dan lanjutkan di mana kamu tinggalkan di web atau aplikasi.
- Kursus
- 12
- Pelajaran
- 48
Pertanyaan yang Sering Diajukan
Apakah pelajaran “Menelusuri Kesalahan Modul WebAssembly” gratis?
Ya — teks lengkap “Menelusuri Kesalahan Modul WebAssembly” gratis dibaca di sini di web. Untuk praktiknya secara interaktif (editor kode bawaan dan tutor AI 24/7) dan buka sisa kursus WebAssembly (WASM) for High Performance Apps, upgrade ke CoddyKit PRO. Kursus WebAssembly (WASM) for High Performance Apps mencakup 4 pelajaran total.
Apa yang akan aku pelajari di “Menelusuri Kesalahan Modul WebAssembly”?
Manfaatkan alat pengembang peramban dan teknik penelusuran kesalahan lainnya untuk memeriksa serta memperbaiki masalah pada aplikasi WASM Anda. Kamu berlatih WebAssembly (WASM) for High Performance Apps dengan kode praktik yang langsung kamu jalankan di browser, dan tutor AI 24/7 menjawab pertanyaanmu saat kamu mengerjakan pelajaran ini.
Apakah aku perlu pengalaman untuk memulai WebAssembly (WASM) for High Performance Apps?
Tidak diperlukan pengalaman sebelumnya. WebAssembly (WASM) for High Performance Apps di CoddyKit dirancang untuk pemula hingga pelajar tingkat lanjut, jadi kamu bisa memulai di sini atau dari awal dan belajar sesuai kecepatan kamu sendiri. Ini adalah pelajaran 3 dari 4.
Berapa lama pelajaran “Menelusuri Kesalahan Modul WebAssembly” memakan waktu?
Sebagian besar pelajaran CoddyKit memakan waktu sekitar 5–10 menit. Setiap pelajaran ringkas dan interaktif, jadi kamu membuat kemajuan stabil dan melanjutkan dari tempat kamu tinggalkan di web dan aplikasi.
Bisakah aku menulis dan menjalankan kode dalam pelajaran WebAssembly (WASM) for High Performance Apps ini?
Ya. Setiap pelajaran WebAssembly (WASM) for High Performance Apps menyertakan editor kode bawaan, jadi kamu menulis dan menjalankan kode nyata langsung di browser dan mendapatkan umpan balik AI instan — tidak diperlukan penyiapan lokal.
Semua pelajaran dalam kursus ini
- Menguji Kinerja WASM
- Mengoptimalkan Kode Rust untuk WASM
- Menelusuri Kesalahan Modul WebAssembly
- SIMD dan Multithreading untuk Throughput Maksimal