JVM 源码阅读

JVM 源码阅读

github openjdk-projects openjdk8-github

JDK 11

Linux 编译源码

JDK 1.8

MACOS 编译源码

https://www.cnblogs.com/jhxxb/p/11094578.html

1. 安装 mercurial brew install hg 或者 brew install mercurial

   加速编译 brew install ccache

2. 下载源码

   hg clone http://hg.openjdk.java.net/jdk8u/jdk8u
   cd jdk8u
   bash get_source.sh
   

3. 阅读README-builds.html 文件，按照文档给出的指导进行下面的编译操作

4. 下载安装jdk7,jdk7和8是可以共存的

5. 执行配置 bash ./configure --enable-ccache --with-boot-jdk=/Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home --with-debug-level=slowdebug --with-native-debug-symbols=internal 报错

   configure: error: Failed to determine Xcode version.
   # 查看xcode版本
   xcodebuild -version
   # 报错
   xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance
   # 由于本地安装了xcode 则直接执行下面的命令 问题解决
   sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
   

报错

configure: error: Could not find freetype!
## 安装
brew install freetype

最终输出信息

====================================================
A new configuration has been successfully created in
/Users/admin/Workspace/src/jdk8u/build/macosx-x86_64-normal-server-slowdebug
using configure arguments '--with-boot-jdk=/Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home --with-debug-level=slowdebug --with-native-debug-symbols=internal'.

Configuration summary:
* Debug level:    slowdebug
* JDK variant:    normal
* JVM variants:   server
* OpenJDK target: OS: macosx, CPU architecture: x86, address length: 64

Tools summary:
* Boot JDK:       java version "1.7.0_80" Java(TM) SE Runtime Environment (build 1.7.0_80-b15) Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)  (at /Library/Java/JavaVirtualMachines/jdk1.7.0_80.jdk/Contents/Home)
* Toolchain:      clang (clang/LLVM)
* C Compiler:     Version 12.0.5 (at /usr/bin/clang)
* C++ Compiler:   Version 12.0.5 (at /usr/bin/clang++)

Build performance summary:
* Cores to use:   4
* Memory limit:   16384 MB

1. 编译 CONF参数可以不指定 make images JOBS=8 CONF=macosx-x86_64-normal-server-slowdebug

2. 验证是否成功 ./build/macosx-x86_64-normal-server-release/jdk/bin/java -version /Users/admin/Workspace/src/jdk8u/build/macosx-x86_64-normal-server-slowdebug/jdk/bin/java -version

debug

gdb

mac 环境没法用 会卡住，现在官方还没给出解决方案 export LD_LIBRARY_PATH=/Users/admin/Workspace/src/jdk8u/build/macosx-x86_64-normal-server-slowdebug/hotspot/bsd_amd64_compiler2/debug gdb --args /Users/admin/Workspace/src/jdk8u/build/macosx-x86_64-normal-server-slowdebug/jdk/bin/java -version

lldb

由于gdb 没法用 lldb -- /Users/admin/Workspace/src/jdk8u/build/macosx-x86_64-normal-server-slowdebug/jdk/bin/java -version

可能会碰到线程中断的问题

* thread #3, stop reason = signal SIGSEGV
    frame #0: 0x0000000108cc42b4
->  0x108cc42b4: movl   (%rsi), %eax
    0x108cc42b6: leaq   0xf8(%rbp), %rsi
    0x108cc42bd: vmovdqu %ymm0, (%rsi)
    0x108cc42c1: vmovdqu %ymm7, 0x20(%rsi)
Target 0: (java) stopped.

解决方式

process handle -p true -n true -s true SIGSEGV
c

最终成功