Wasm3 项目教程

项目介绍

Wasm3 是一个快速的 WebAssembly 解释器，也是最通用的 WASM 运行时。它基于 CoreMark 1.0 和独立基准测试，能够在广泛的架构和平台上运行，包括 x86、x86_64、ARM、RISC-V、PowerPC、MIPS、Xtensa、ARC32 等。Wasm3 不仅可以在 Linux、Windows、OS X、FreeBSD、Android、iOS、OpenWrt、Yocto 等系统上运行，还可以作为库集成到多种编程语言中，如 Python3、Rust、C/C++、GoLang、Zig、Perl、Swift、Net、Nim、Arduino、PlatformIO、Particle、QuickJS 等。

项目快速启动

安装

要安装 Wasm3，请按照以下步骤进行：

1. 克隆项目仓库：

   git clone https://github.com/wasm3/wasm3.git
   cd wasm3
   

2. 编译项目：

   make
   

3. 运行示例：

   ./build/wasm3 examples/dino.wasm
   

使用示例

以下是一个简单的 Wasm3 使用示例，假设你已经有一个编译好的 WASM 文件 example.wasm：

#include "wasm3.h"
#include "m3_env.h"

int main(int argc, char** argv) {
    if (argc < 2) {
        printf("Usage: %s <wasm file>\n", argv[0]);
        return 1;
    }

    const char* wasm_file = argv[1];
    FILE* file = fopen(wasm_file, "rb");
    if (!file) {
        printf("Failed to open wasm file: %s\n", wasm_file);
        return 1;
    }

    fseek(file, 0, SEEK_END);
    size_t wasm_len = ftell(file);
    fseek(file, 0, SEEK_SET);

    uint8_t* wasm_bytes = malloc(wasm_len);
    if (!wasm_bytes) {
        printf("Failed to allocate memory for wasm file\n");
        fclose(file);
        return 1;
    }

    size_t bytes_read = fread(wasm_bytes, 1, wasm_len, file);
    fclose(file);

    if (bytes_read != wasm_len) {
        printf("Failed to read wasm file\n");
        free(wasm_bytes);
        return 1;
    }

    IM3Environment env = m3_NewEnvironment();
    if (!env) {
        printf("Failed to create WASM environment\n");
        free(wasm_bytes);
        return 1;
    }

    IM3Runtime runtime = m3_NewRuntime(env, 1024, NULL);
    if (!runtime) {
        printf("Failed to create WASM runtime\n");
        m3_FreeEnvironment(env);
        free(wasm_bytes);
        return 1;
    }

    IM3Module module;
    M3Result result = m3_ParseModule(env, &module, wasm_bytes, wasm_len);
    if (result) {
        printf("Failed to parse module: %s\n", result);
        m3_FreeRuntime(runtime);
        m3_FreeEnvironment(env);
        free(wasm_bytes);
        return 1;
    }

    result = m3_LoadModule(runtime, module);
    if (result) {
        printf("Failed to load module: %s\n", result);
        m3_FreeModule(module);
        m3_FreeRuntime(runtime);
        m3_FreeEnvironment(env);
        free(wasm_bytes);
        return 1;
    }

    IM3Function f;
    result = m3_FindFunction(&f, runtime, "main");
    if (result) {
        printf("Failed to find function: %s\n", result);
        m3_Free