1. 编译、调试HotSpot VM 8

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原创 2024-09-22 01:52:59 1.8k 阅读 AI 写同款· GEO 优化 ›

调试HotSpot的JIT编译的注意事项通常，当您编译 Java 程序时，它首先由 Java 编译器编译为字节码。但是，该字节码尚未优化。在 HotSpot（OpenJDK 的 JVM）中，这在运行时发生，并由 JIT（即时编译器）完成。这种处理方式允许 JIT 最大限度地利用代码运行的条件，例如硬件，甚至在某种程度上利用输入到程序中的特定数据。阅读详情

编译环境

Ubuntu 22.04.1 (Jammy Jellyfish)

OpenJDK jdk8-b120

注意：Ubuntu 配置 apt 安装源为阿里源可以提高加载速度

设置 apt 安装阿里源

备份

sudo cp /ect/apt/sources.list /etc/apt/sources.list.bak

添加阿里源

deb http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse

deb-src http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ jammy-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse

更新

sudo apt-get update && sudo apt-get upgrade

安装JDK7

略... (最新的ubuntu下，apt 已经不提供jdk7的安装软件了,..F...)

下载要编译的JDK8版本

1. 筛选tag:

打开github:https://github.com/openjdk/jdk/,筛选一下下一步需要构件的版本的tag

2. 下载代码

可以使用git clone。也可以点击点击Download Zip，这里使用Download Zip的方式。

注意：如果选择git clone注意只需要clone这个tag的就行。如果clone所有的代码量比较大，会很慢。

执行编译

1. configure检测

slowdebug 模式

bash ./configure --with-target-bits=64 --with-jvm-variants=server  --with-debug-level=slowdebug --disable-zip-debug-info  --with-boot-jdk=/home/cap/software/jdk7/

release 模式

bash ./configure --with-target-bits=64 --with-jvm-variants=server  --with-debug-level=release --disable-zip-debug-info  --with-boot-jdk=/home/cap/software/jdk7/

参数解释:

--with-target-bits=64: 构建64的JDK

--with-jvm-variants=server :构建server模式的JDK

--with-debug-level=slowdebug: slowdebug带有更多的调试信息

--disable-zip-debug-info：禁止压缩调试信息，可以方便调试

--with-boot-jdk=/export/soft/java-se-7u75-ri/ ：表示boot jdk的路径，就是jdk7的路径

release：使用此选项编译 JDK 以进行生产发布，通常会关闭调试信息和开启优化。

fastdebug：以调试信息编译 JDK，但不包含额外的调试功能和检查。

product：编译用于生产环境的 JDK，类似于 release 选项。

optimize：开启所有优化。

debug：开启完整的调试信息和调试功能。

2. 可能碰到的错误

1~6

1. 错误提示：configure: error: Cannot find GNU make 3.81 or newer! Please put it in the path, or add e.g. MAKE=/opt/gmake3.81/make as argument to configure.

sudo apt-get install make

2. 错误提示：configure: error: Could not find a C compiler. You might be able to fix this by running 'sudo apt-get install build-essential'.

# 安装 build-essential
sudo apt-get install build-essential

3. 错误提示：configure: error: Could not find all X11 headers (shape.h Xrender.h XTest.h Intrinsic.h). You might be able to fix this by running 'sudo apt-get install libX11-dev libxext-dev libxrender-dev libxtst-dev libxt-dev'.

# 安装 libX11-dev libxext-dev libxrender-dev libxtst-dev libxt-dev
# 注意 libx11-dev 的 X 是小写
sudo apt-get install libx11-dev libxext-dev libxrender-dev libxtst-dev libxt-dev

4. 错误提示：configure: error: Could not find cups! You might be able to fix this by running 'sudo apt-get install libcups2-dev'.

# 安装 libcups2-dev
sudo apt-get install libcups2-dev

5. 错误提示：configure: error: Could not find freetype! You might be able to fix this by running 'sudo apt-get install libfreetype6-dev'.

# 安装 libfreetype6-dev
sudo apt-get install libfreetype6-dev

6. 错误提示：configure: error: Could not find alsa! You might be able to fix this by running 'sudo apt-get install libasound2-dev'.

# 安装 libasound2-dev
sudo apt-get install libasound2-dev

7. gcc版本问题

根据官方文档()OpenJDK Build README，构建jdk8需要gcc 4.3。

安装gcc和g++ 4.9版本

修改apt源：

sudo vi /etc/apt/sources.list

添加以下内容到文件末尾：

#install gcc 4.9
deb http://dk.archive.ubuntu.com/ubuntu/ xenial main
deb http://dk.archive.ubuntu.com/ubuntu/ xenial universe

Xenial Xerus 是 Ubuntu 的 16.04 版本的代号，在22.04版本(Jammy Jellyfish)版本的deb中已经找不到gcc4.9的包

更新源&安装gcc4.9

sudo apt-get update
sudo apt install gcc-4.9
sudo apt install g++-4.9

管理多版本gcc：

cap@cap:/usr/bin$ sudo mv gcc gcc-11

cap@cap:/usr/bin$ sudo mv g++ g++-11

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-11 50
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-11 50

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 20
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.9 20

切换到4.9版本：

sudo update-alternatives --config gcc
cap@cap:/usr/bin$ sudo update-alternatives --config gcc

有 2 个候选项可用于替换 gcc (提供 /usr/bin/gcc)。


  选择       路径            优先级  状态

------------------------------------------------------------

* 0            /usr/bin/gcc-11    50        自动模式

  1            /usr/bin/gcc-11    50        手动模式

  2            /usr/bin/gcc-4.9   20        手动模式


要维持当前值[*]请按<回车键>，或者键入选择的编号：2

sudo update-alternatives --config g++

cap@cap:/usr/bin$ sudo update-alternatives --config gcc

有 2 个候选项可用于替换 gcc (提供 /usr/bin/gcc)。

选择       路径            优先级  状态

0            /usr/bin/gcc-11    50        自动模式

1            /usr/bin/gcc-11    50        手动模式

2            /usr/bin/gcc-4.9   20        手动模式

要维持当前值[*]请按<回车键>，或者键入选择的编号：2

3. 检测通过

====================================================

A new configuration has been successfully created in

/home/cap/software/openjdk8/build/linux-x86_64-normal-server-release

using configure arguments '--with-target-bits=64 --with-jvm-variants=server --with-debug-level=release --disable-zip-debug-info --with-boot-jdk=/home/cap/software/jdk7/'.


Configuration summary:

* Debug level:    release

* JDK variant:    normal

* JVM variants:   server

* OpenJDK target: OS: linux, CPU architecture: x86, address length: 64


Tools summary:

* Boot JDK:       openjdk version "1.7.0_75" OpenJDK Runtime Environment (build 1.7.0_75-b13) OpenJDK 64-Bit Server VM (build 24.75-b04, mixed mode)  (at /home/cap/software/jdk7)

* Toolchain:      gcc (GNU Compiler Collection)

* C Compiler:     Version 4.9.3 (at /usr/bin/gcc)

* C++ Compiler:   Version 4.9.3 (at /usr/bin/g++)


Build performance summary:

* Cores to use:   4

* Memory limit:   7728 MB

4. bear make构建

安装 bear

bear主要是用来生成 compilation database。用来给后续Clion使用，如果使用gdb调试不适用Clion的图形化调试可以不用bear。

debug make

cd build/linux_x86_64-normal-server-slowdebug  

bear -- make all

release make

cd build/linux_x86_64-normal-server-release   

bear -- make all

或者可以这样做，但是这样，会导致compile_commands.json被覆盖，

bear -- make CONF=debug all

bear -- make CONF=release all

可能碰到的错误

错误1：操作系统检测失败

错误提示：

*** This OS is not supported: Linux Lincoln 4.15.0-130-generic #134-Ubuntu SMP Tue Jan 5 20:46:26 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

make[5]: *** [check_os_version] Error 1

/home/parallels/workspace/openjdk/jdk-jdk8-b120/hotspot/make/linux/Makefile:234: recipe for target 'check_os_version' failed

解决办法：

修改Makefile文件

vi hotspot/make/linux/Makefile

修改:

SUPPORTED_OS_VERSION = 2.4% 2.5% 2.6% 3%

错误2：make语法不兼容

/usr/bin/make: invalid option -- '8'

/usr/bin/make: invalid option -- '-'

/usr/bin/make: invalid option -- '1'

/usr/bin/make: invalid option -- '2'

...

/usr/bin/make: invalid option -- 'c'

解决方法: 修改adjust-mflags.sh

vi hotspot/make/linux/makefiles/adjust-mflags.sh

添加一个大写I

错误3:忽略警告

错误信息:

cc1plus: all warnings being treated as errors

解决方法: 修改gcc.make文件

vi hotspot/make/linux/makefiles/gcc.make

注释掉如下这行

通过提示

Tools summary:
* Boot JDK:       openjdk version "1.8.0_275" OpenJDK Runtime Environment (build 1.8.0_275-8u275-b01-0ubuntu1~20.04-b01) OpenJDK 64-Bit Server VM (build 25.275-b01, mixed mode)  (at /usr/lib/jvm/java-8-openjdk-amd64)
* C Compiler:     x86_64-linux-gnu-gcc-9 (Ubuntu 9.3.0-17ubuntu1~20.04) version 9.3.0 (at /usr/bin/x86_64-linux-gnu-gcc-9)
* C++ Compiler:   x86_64-linux-gnu-g++-9 (Ubuntu 9.3.0-17ubuntu1~20.04) version 9.3.0 (at /usr/bin/x86_64-linux-gnu-g++-9)

Build performance summary:
* Cores to use:   1
* Memory limit:   3936 MB
* ccache status:  not installed (consider installing)

Build performance tip: ccache gives a tremendous speedup for C++ recompilations.
You do not have ccache installed. Try installing it.
You might be able to fix this by running 'sudo apt-get install ccache'.

编译 - make all

----- Build times -------
Start 2020-12-12 22:17:38
End   2020-12-12 22:51:31
00:00:54 corba
00:01:03 demos
00:04:57 docs
00:16:08 hotspot
00:01:06 images
00:00:35 jaxp
00:01:05 jaxws
00:06:49 jdk
00:00:54 langtools
00:00:21 nashorn
00:33:53 TOTAL
-------------------------
Finished building OpenJDK for target 'all'

确认编译成功

cd /javawork/jdk/build/linux-x86_64-normal-server-release/jdk/bin

./java -version

openjdk version "1.8.0-internal"
OpenJDK Runtime Environment (build 1.8.0-internal-zsh_2020_12_12_22_17-b00)
OpenJDK 64-Bit Server VM (build 25.0-b62, mixed mode)