1. 在Ubuntu上构建编译jdk12-CFANZ编程社区

构建编译环境

下载openjdk12的的源码
链接
zip下载

安装GCC

sudo apt-get install build-essential

安装OpenJDK的编译依赖库

FreeType   sudo apt-get install libfreetype6-dev

CUPS   sudo apt-get install libcups2-dev

X11   sudo apt-get install libx11-dev libxext-dev libxrender-dev libxrandr-dev libxtst-dev libxt-dev

ALSA   sudo apt-get install libasound2-dev

libffi  sudo apt-get install libffi-dev

Autoconf  sudo apt-get install autoconf

想要编译OpenJDK12就要安装至少OpenJDK11

sudo apt-get install openjdk-11-jdk

bash configure --help打印出configure命令的帮助
编译FastDebug版、仅含Server模式的HotSpot虚拟机
bash configure --enable-debug --with-jvm-variants=server

编译成功的话

====================================================
A new configuration has been successfully created in
/home/amazong-xyb/Desktop/JVM-Lreaned/jdk12-06222165c35f/build/linux-x86_64-server-fastdebug
using configure arguments '--enable-debug --with-jvm-variants=server'.

Configuration summary:
* Debug level:    fastdebug
* HS debug level: fastdebug
* JVM variants:   server
* JVM features:   server: 'aot cds cmsgc compiler1 compiler2 epsilongc g1gc graal jfr jni-check jvmci jvmti management nmt parallelgc serialgc services shenandoahgc vm-structs zgc' 
* OpenJDK target: OS: linux, CPU architecture: x86, address length: 64
* Version string: 12-internal+0-adhoc.amazongxyb.jdk12-06222165c35f (12-internal)

Tools summary:
* Boot JDK:       openjdk version "11.0.14" 2022-01-18 OpenJDK Runtime Environment (build 11.0.14+9-Ubuntu-0ubuntu2.18.04) OpenJDK 64-Bit Server VM (build 11.0.14+9-Ubuntu-0ubuntu2.18.04, mixed mode, sharing)  (at /usr/lib/jvm/java-11-openjdk-amd64)
* Toolchain:      gcc (GNU Compiler Collection)
* C Compiler:     Version 7.5.0 (at /usr/bin/gcc)
* C++ Compiler:   Version 7.5.0 (at /usr/bin/g++)

Build performance summary:
* Cores to use:   4
* Memory limit:   7927 MB

并且在build目录下出现一个

输入make images编译整个OpenJDK后这个目录下就有

bootcycle-spec.gmk  
buildtools     
configure-support  
jdk           
spec.gmk
buildjdk-spec.gmk   
compare.sh     
hotspot            
Makefile      
support
build.log           
configure.log  
images             
make-support

make的命令

···

在build/机器名/jdk/bin/jdk/bin/下运行java -version可以看

openjdk version "11.0.14" 2022-01-18
OpenJDK Runtime Environment (build 11.0.14+9-Ubuntu-0ubuntu2.18.04)
OpenJDK 64-Bit Server VM (build 11.0.14+9-Ubuntu-0ubuntu2.18.04, mixed mode, sharing)

配置jdk环境变量

sudo gedit ~/.bashrc    //配置JAVA_HOME路径 

bashrc文件中添加:

export JAVA_HOME=/home/aaron/jvm/jdk12/build/linux-x86_64-server-fastdebug/jdk
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH


source ~/.bashrc        //使文件立即生效

然后再任意路径下都可以用java -version查看

在jdk的源码编译目录下新建CMakeLists.txt

CMakeLists.txt:

cmake_minimum_required(VERSION 3.7)
project(hotspot)
include_directories(
		src/hotspot/cpu
		src/hotspot/os
		src/hotspot/os_cpu
		src/hotspot/share
		src/hotspot/share/precompiled
		src/hotspot/share/include
		src/java.base/unix/native/include
		src/java.base/share/native/include
		src/java.base/share/native/libjli
)
file(GLOB_RECURSE SOURCE_FILES "*.cpp" "*.hpp" "*.c" "*.h")
add_executable(hotspot ${SOURCE_FILES})

通过CLion打开CMakeLists.txt

就可以把jdk12导入项目了

项目构建完了之后就可以编写Java代码测试一下了
编写Java代码放到/home/aaron/jvm/jdk12/build/linux-x86_64-server-fastdebug/jdk/bin/下。具体编写的Java代码如下:

public class Test{
	public static void main(String[] args){	
		System.out.println("Hello world!");
	}
}

将此代码编译成.class文件

配置Clion中运行配置

打断点调试

q08b6K)

打断点调试
[外链图片转存中…(img-Gi4J8ery-1648366609311)]
[外链图片转存中…(img-2645h0H3-1648366609311)]

搞完了还是啥也看不懂