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把 C/C++ 编译成 WebAssembly

参考文章:《从零开始把 C/C++ 编译成 WebAssembly》

源代码

./
 ├── fib.c    # 斐波那契函数
 └── hello.c  # 输出 Hello World!

编译代码

首先安装依赖:

  1. Emscripten
  2. wasi-sdk
  3. WABT (WebAssembly Binary Toolkit)

然后执行下方命令即可编译所有代码,具体每行命令的含义,参考文件内的注释。

./build.sh

测试代码

首先安装 Node.js ,然后在当前目录下执行 npm install,然后就可以执行如下测试:

1. 测试 hello.c

node test-hello.js

将会得到两行输出,分别由 Emscripten 和 wasi-sdk 编译而来:

Hello World!
Hello World!

2. 测试 fib.c

node test-fib.js

将会得到两行输出:

[emcc] fib(3) = 2
[wasi] fib(3) = 2

可以在命令后指定要计算的数字:

node test-fib.js 17

输出:

[wasi] fib(17) = 1597
[emcc] fib(17) = 1597

使用独立运行时

可以使用独立的 WebAssembly 运行时执行编译出来的代码,以 Wasmtime 为例:

# 输出 Hello World!
wasmtime out/hello-wasi.wasm
# 调用 wasi-sdk 编译出来的 fib 函数
wasmtime out/fib-wasi.wasm --invoke fib 8
# 调用 Emscripten 编译出来的 fib 函数
wasmtime out/fib-emcc.wasm --invoke _fib 11

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