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WebAssembly for Systems Programming

Building High-Performance Portable Software with Wasm

WebAssembly for Systems Programming
This book is 100% completeLast updated on 2026-08-01
Steve Publications

Build fast, portable software that runs almost anywhere with WebAssembly. From reusable libraries and command line tools to plugins and server-side services, this practical guide shows how Wasm works and how to use it in real projects with complete code and clear explanations from start to production.

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About

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About the Book

WebAssembly has evolved from a browser bytecode format into a genuine systems programming platform. This book takes you from first principles through production deployment, explaining not only how WebAssembly works but why it is designed the way it is. You will learn to build reusable libraries, command-line tools, plugin architectures, and server-side services that run with near-native performance across any platform. Every chapter features complete, working code that compiles and runs without omissions or placeholders, guiding you step by step from setting up your development environment to deploying reliable, efficient, portable WebAssembly-based systems in production.

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About the Author

Steve Publications

Steve is a technology professional with over 20 years of experience in software development, server infrastructure, cybersecurity, vulnerability research and reverse engineering. He specializes in analyzing complex systems, identifying weaknesses and improving security.

Beyond his professional work, Steve collaborates with researchers and industry experts to create practical technical books covering software development, cybersecurity, cloud computing, DevOps, AI and enterprise technologies. His goal is to help IT professionals, students and enthusiasts develop practical skills through clear explanations, real-world examples and hands-on exercises.

At Steve Publications, we use AI to assist with translation, proofreading and editing but not to replace the research, technical expertise or hands-on experience behind our books. Some authors publish under pseudonyms for privacy or professional reasons.

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Contents

Table of Contents

Building High-Performance Portable Software with Wasm

Introduction

  1. What This Book Will Teach You
  2. How This Book Is Structured
  3. What Makes WebAssembly Different
  4. A Note on Versions and Stability

Chapter 1: What Is WebAssembly and Why It Matters for Systems Programming

  1. From Browser Bytecode to Systems Platform
  2. The Portability Problem in Modern Systems Programming
  3. Performance Characteristics and Trade-offs
  4. The WebAssembly Ecosystem Landscape
  5. What This Book Will Build

Chapter 2: Architecture Deep Dive: The WebAssembly Execution Model

  1. The Stack Machine Design Philosophy
  2. Types and Values in WebAssembly
  3. Instructions and Control Flow
  4. Functions as First-Class Units
  5. Verification and Safety Guarantees

Chapter 3: Memory Model: Linear Memory and Allocation Strategies

  1. The Linear Memory Abstraction
  2. Memory Operations and Bounds Checking
  3. Stack Allocation Within Linear Memory
  4. Heap Allocators for WebAssembly
  5. Memory Sharing and Inter-Module Communication

Chapter 4: Modules and Interfaces: The WebAssembly Component Model

  1. WebAssembly Modules: Structure and Semantics
  2. Exports and Imports: Connecting Code
  3. The WebAssembly Component Model
  4. Resource Management in Components
  5. Building Composable Systems with Components

Chapter 5: Toolchains and Development Setup

  1. Installing Core Runtimes: Wasmtime and Wasmer
  2. Compiling from Rust to WebAssembly
  3. Compiling from C and C++ to WebAssembly
  4. Build Tools: wasm-pack, wasm-tools, and cargo-wasi
  5. Development Workflow Patterns

Chapter 6: WASI: The WebAssembly System Interface

  1. Why WASI Exists: Bridging Modules and Operating Systems
  2. WASI Preview 1 API Surface
  3. Running WASI Modules with Wasmtime
  4. WASI Preview 2 and the Component Model
  5. Custom Host Implementations of WASI

Chapter 7: Language Interoperability: Writing and Calling WebAssembly from Multiple Languages

  1. Rust as a First-Class WebAssembly Language
  2. C and C++ Compilation to WebAssembly
  3. Go WebAssembly Support and Limitations
  4. AssemblyScript and TypeScript-to-Wasm
  5. Cross-Language Calling Patterns

Chapter 8: Building Reusable WebAssembly Modules and Libraries

  1. Designing Stable APIs for WebAssembly Modules
  2. Memory Management Across Module Boundaries
  3. Packaging and Distributing WebAssembly Libraries
  4. Dependency Management in WebAssembly Projects
  5. Case Study: Building a Data Processing Library as WebAssembly

Chapter 9: Command-Line Tools and Plugins with WebAssembly

  1. Building CLI Tools That Run as WebAssembly
  2. The Plugin Architecture Pattern
  3. Building a Plugin Host in Rust
  4. Writing Plugins as WebAssembly Modules
  5. Real-World Plugin Systems Using WebAssembly

Chapter 10: Server-Side WebAssembly: High-Performance Services

  1. Server-Side Runtimes: Wasmtime, WasmEdge, and Spin
  2. Building HTTP Services with WebAssembly
  3. Compute-Intensive Workloads in WebAssembly
  4. Multi-Threading and Parallelism in Server-Side Wasm
  5. Scaling WebAssembly Services

Chapter 11: Security and Sandboxing: Trusting Untrusted Code

  1. The WebAssembly Security Model
  2. Capability-Based Access Control with WASI
  3. Threat Models for WebAssembly Systems
  4. Side Channel Attacks and Defenses
  5. Secure Plugin and Extension Architectures

Chapter 12: Debugging, Profiling, and Optimization

  1. Debugging WebAssembly Code
  2. Profiling WebAssembly Performance
  3. Runtime Optimization: JIT and AOT Compilation
  4. Code-Level Optimization Techniques
  5. Benchmarking WebAssembly Applications

Chapter 13: Testing WebAssembly Systems Software

  1. Unit Testing WebAssembly Modules
  2. Integration Testing Strategies
  3. Property-Based Testing and Fuzzing
  4. Cross-Runtime Compatibility Testing
  5. Mutation Testing and Coverage Analysis

Chapter 14: Deployment and Operations

  1. Packaging WebAssembly Applications for Production
  2. Deploying to Cloud Platforms
  3. Monitoring and Observability
  4. Updating and Versioning Deployed Modules
  5. Operational Best Practices

Chapter 15: Advanced Systems Programming with WebAssembly

  1. Building Custom WebAssembly Runtimes
  2. WebAssembly in the Kernel and Operating Systems
  3. Advanced Networking with WebAssembly
  4. Memory-Mapped I/O and Hardware Access Patterns
  5. The Future of WebAssembly as a Systems Platform

Conclusion: The WebAssembly Systems Programming Paradigm

  1. What WebAssembly Does Well
  2. When WebAssembly Is Not the Right Choice
  3. A Practical Decision Framework
  4. The Skills You Now Have
  5. Looking Forward

References

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