win10编译v8引擎

记录在win10编译v8过程。

编译环境

参考网址 可以单独通过git从github下载v8引擎源码，官方推荐使用depot_toos下载源码，因此本文使用depot_tools下载拉去v8源码。

设置代理

因为v8源码在外网上,默认不能访问,因此需要配置一个代理。
打开window控制台,设置代理信息

@echo off
set HTTP_PROXY=http://127.0.0.1:8293
set HTTPS_PROXY=http://127.0.0.1:8293

下载depot_tools

下载depot_tools压缩包, 或者使用git clone下来 git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
然后配置环境变量, 添加depot_tools目录到环境变量path中

安装window 10 sdk

编译v8在window上需要window sdk, 当前在win10上编译v8需要最新window sdk版本为10.0.20348.0, 下载网址,下载完成安装。

下载v8 源码

打开控制台,进入指定目录创建v8目录,然后进入v8目录后执行fetch v8获取v8源码

cd c:\home
mkdir v8
cd v8
fetch v8

编译步骤

打开控制台,进入v8目录,使用gn生成编译文件

cd c:\home\v8\v8

编译32位v8程序

通过gn生成编译环境后需要修改对应目录下的args.gn文件,修改对应的target_cpu类型（x86）

编译debug版

gn args out/x86.debug
#执行完后需要修改args.gn文件,然后执行ninja编译

ninja -C out\x86.debug v8_monolith

编译release版

gn args out/x86.release
#执行完后需要修改args.gn文件,然后执行ninja编译

ninja -C out\x86.release v8_monolith

args.gn文件内容

文件路径路径: c:\home\v8\v8\out\x86.release\args.gn

v8_monolithic=true 
v8_use_external_startup_data=false 
use_custom_libcxx=false 
is_component_build=false 
treat_warnings_as_errors=false 
v8_symbol_level=0 
is_clang=false 
is_debug=false   #是否debug
target_cpu="x86" #目标cpu类型

编译64位v8程序

编译debug版

gn args out/x64.debug
#执行完后需要修改args.gn文件,然后执行ninja编译

ninja -C out\x64.debug v8_monolith

编译release版

gn args out/x64.release
#执行完后需要修改args.gn文件,然后执行ninja编译

ninja -C out\x64.release v8_monolith

args.gn文件内容

文件路径路径: c:\home\v8\v8\out\x64.release\args.gn

v8_monolithic=true 
v8_use_external_startup_data=false 
use_custom_libcxx=false 
is_component_build=false 
treat_warnings_as_errors=false 
v8_symbol_level=0 
is_clang=false 
is_debug=false   #是否debug
target_cpu="x64" #目标cpu类型

c++样例

需要注意的是初始化v8的时候，必须填充当前程序的路径，否则会出现异常.

void CJavaScriptEngine::TestFunction() {
	TCHAR szCurrentDir[MAX_PATH] = { 0 };
	GetModuleFileName(NULL, szCurrentDir, sizeof(szCurrentDir));
	SStringT exePath(szCurrentDir);
	SStringA exePath1 = S_CW2A(exePath);
	// Initialize V8.
	v8::V8::InitializeICUDefaultLocation(exePath1.c_str());
	v8::V8::InitializeExternalStartupData(exePath1.c_str());
	std::unique_ptr<v8::Platform> platform = v8::platform::NewDefaultPlatform();
	v8::V8::InitializePlatform(platform.get());
	v8::V8::Initialize();

	// Create a new Isolate and make it the current one.
	v8::Isolate::CreateParams create_params;
	create_params.array_buffer_allocator =
		v8::ArrayBuffer::Allocator::NewDefaultAllocator();
	v8::Isolate* isolate = v8::Isolate::New(create_params);
	{
		v8::Isolate::Scope isolate_scope(isolate);

		// Create a stack-allocated handle scope.
		v8::HandleScope handle_scope(isolate);

		// Create a new context.
		v8::Local<v8::Context> context = v8::Context::New(isolate);

		// Enter the context for compiling and running the hello world script.
		v8::Context::Scope context_scope(context);

		{
			// Create a string containing the JavaScript source code.
			v8::Local<v8::String> source =
				v8::String::NewFromUtf8Literal(isolate, "'Hello' + ', World!'");

			// Compile the source code.
			v8::Local<v8::Script> script =
				v8::Script::Compile(context, source).ToLocalChecked();

			// Run the script to get the result.
			v8::Local<v8::Value> result = script->Run(context).ToLocalChecked();

			// Convert the result to an UTF8 string and print it.
			v8::String::Utf8Value utf8(isolate, result);
			printf("%s\n", *utf8);
		}

		{
			// Use the JavaScript API to generate a WebAssembly module.
			//
			// |bytes| contains the binary format for the following module:
			//
			//     (func (export "add") (param i32 i32) (result i32)
			//       get_local 0
			//       get_local 1
			//       i32.add)
			//
			const char csource[] = R"(
        let bytes = 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
        ]);
        let module = new WebAssembly.Module(bytes);
        let instance = new WebAssembly.Instance(module);
        instance.exports.add(3, 4);
      )";

			// Create a string containing the JavaScript source code.
			v8::Local<v8::String> source =
				v8::String::NewFromUtf8Literal(isolate, csource);

			// Compile the source code.
			v8::Local<v8::Script> script =
				v8::Script::Compile(context, source).ToLocalChecked();

			// Run the script to get the result.
			v8::Local<v8::Value> result = script->Run(context).ToLocalChecked();

			// Convert the result to a uint32 and print it.
			uint32_t number = result->Uint32Value(context).ToChecked();
			printf("3 + 4 = %u\n", number);
		}
	}

	// Dispose the isolate and tear down V8.
	isolate->Dispose();
	v8::V8::Dispose();
	v8::V8::DisposePlatform();
	delete create_params.array_buffer_allocator;
}