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hg clone http://hg.openjdk.java.net/jdk9/jdk9 sh get_source.sh 

jaxp: transaction abort! jaxp: rollback completed jaxp: abort: stream ended unexpectedly (got 33981 bytes, expected 44934)

jaxws: transaction abort!jaxws: rollback completed jaxws: abort: HTTP request error (incomplete response) jaxws: (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)

https://github.com/unofficial-openjdk/openjdk/https://github.com/dmlloyd/openjdk

$ git clone https://github.com/dmlloyd/openjdk.gitCloning into 'openjdk'...remote: Counting objects: 1205936, done.remote: Compressing objects: 100% (4192/4192), done.error: RPC failed; curl 56 LibreSSL SSL_read: SSL_ERROR_SYSCALL, errno 54fatal: The remote end hung up unexpectedlyfatal: early EOFfatal: index-pack failed
$ git clone https://github.com/dmlloyd/openjdk.gitCloning into 'openjdk'...remote: Counting objects: 1205936, done.remote: Compressing objects: 100% (4192/4192), done.error: RPC failed; curl 18 transfer closed with outstanding read data remainingfatal: The remote end hung up unexpectedlyfatal: early EOFfatal: index-pack failed
$ git clone https://github.com/dmlloyd/openjdk.gitCloning into 'openjdk'...remote: Counting objects: 1205936, done.remote: Compressing objects: 100% (4192/4192), done.error: RPC failed; curl 56 LibreSSL SSL_read: SSL_ERROR_SYSCALL, errno 60fatal: The remote end hung up unexpectedlyfatal: early EOFfatal: index-pack failed

sh configure --with-debug-level=slowdebug --disable-warnings-as-errors --with-freetype-include=/usr/local/Cellar/freetype/2.9.1/include/freetype2--with-freetype-lib=/usr/local/Cellar/freetype/2.9.1/lib --with-boot-jdk=/Library/Java/JavaVirtualMachines/jdk1.8.0_161.jdk/Contents/Home --with-target-bits=64 

make all

----- Build times -------Start 2022-01-16 00:53:13 End 2022-01-16 01:00:4400:07:31 TOTALFinished building target 'all' in configuration 'macosx-x86_64-normal-server- slowdebug'

# include "precompiled.hpp"...# include "utilities/macros.hpp"# if INCLUDE_ALL_GCS# include "gc/cms/concurrentMarkSweepThread.hpp"# include "gc/g1/suspendibleThreadSet.hpp"# endif // INCLUDE_ALL_GCS# ifdef COMPILER1# include "c1/c1_globals.hpp"# endif
// 调试引入ostream# include "utilities/ostream.hpp"

// --------------------------------------------------------------------------------------------------// Implementation of Safepoint begin/endstatic bool timeout_error_printed = false;

void SafepointSynchronize::handle_polling_page_exception(JavaThread *thread) { assert(thread->is_Java_thread(), "polling reference encountered by VM thread"); assert(thread->thread_state() == _thread_in_Java, "should come from Java code"); assert(SafepointSynchronize::is_synchronizing(), "polling encountered outside safepoint synchronization");
 if (ShowSafepointMsgs) { tty->print("handle_polling_page_exception: "); } if (PrintSafepointStatistics) { inc_page_trap_count(); } ...}

_JNI_IMPORT_OR_EXPORT_ jint JNICALL JNI_CreateJavaVM(JavaVM **vm, void **penv, void *args) { jint result = 0; # ifdef _WIN32 __try {# endif // 核心入口 result = JNI_CreateJavaVM_inner(vm, penv, args);# ifdef _WIN32 } __except(topLevelExceptionFilter((_EXCEPTION_POINTERS*)_exception_info())) { // Nothing to do. }# endif return result;}

(lldb) process handle SIGSEGV --stop=false

// return null if not foundprivate native Class<?> findBootstrapClass(String name);

JNIEXPORT jclass JNICALLJava_java_lang_ClassLoader_findBootstrapClass(JNIEnv *env, jobject loader, jstring classname){ char *clname; jclass cls = 0; char buf[128]; ...}

static JNINativeMethod methods[] = { {"hashCode", "()I", (void *)&JVM_IHashCode}, {"wait", "(J)V", (void *)&JVM_MonitorWait}, {"notify", "()V", (void *)&JVM_MonitorNotify}, {"notifyAll", "()V", (void *)&JVM_MonitorNotifyAll}, {"clone", "()Ljava/lang/Object;", (void *)&JVM_Clone},};
JNIEXPORT void JNICALLJava_java_lang_Object_registerNatives(JNIEnv *env, jclass cls){ (*env)->RegisterNatives(env, cls, methods, sizeof(methods)/sizeof(methods[0]));}

├─agent Serviceability Agent的客户端实现├─make 用来build出HotSpot的各种配置文件├─src HotSpot VM的源代码│ ├─cpu CPU相关代码（汇编器、模板解释器、ad文件、部分runtime函数在这里实现）│ ├─os 操作系相关代码│ ├─os_cpu 操作系统+CPU的组合相关的代码│ └─share 平台无关的共通代码│ ├─tools 工具│ │ ├─hsdis 反汇编插件│ │ ├─IdealGraphVisualizer 将server编译器的中间代码可视化的工具│ │ ├─launcher 启动程序“java”│ │ ├─LogCompilation 将-XX:+LogCompilation输出的日志（hotspot.log）整理成更容易阅读的格式的工具│ │ └─ProjectCreator 生成Visual Studio的project文件的工具│ └─vm HotSpot VM的核心代码│ ├─adlc 平台描述文件（上面的cpu或os_cpu里的*.ad文件）的编译器│ ├─asm 汇编器接口│ ├─c1 client编译器（又称“C1”）│ ├─ci 动态编译器的公共服务/从动态编译器到VM的接口│ ├─classfile 类文件的处理（包括类加载和系统符号表等）│ ├─code 动态生成的代码的管理│ ├─compiler 从VM调用动态编译器的接口│ ├─gc_implementation GC的实现│ │ ├─concurrentMarkSweep Concurrent Mark Sweep GC的实现│ │ ├─g1 Garbage-First GC的实现（不使用老的分代式GC框架）│ │ ├─parallelScavenge ParallelScavenge GC的实现（server VM默认，不使用老的分代式GC框架）│ │ ├─parNew ParNew GC的实现│ │ └─shared GC的共通实现│ ├─gc_interface GC的接口│ ├─interpreter 解释器，包括“模板解释器”（官方版在用）和“C++解释器”（官方版不在用）│ ├─libadt 一些抽象数据结构│ ├─memory 内存管理相关（老的分代式GC框架也在这里）│ ├─oops HotSpot VM的对象系统的实现│ ├─opto server编译器（又称“C2”或“Opto”）│ ├─prims HotSpot VM的对外接口，包括部分标准库的native部分和JVMTI实现│ ├─runtime 运行时支持库（包括线程管理、编译器调度、锁、反射等）│ ├─services 主要是用来支持JMX之类的管理功能的接口│ ├─shark 基于LLVM的JIT编译器（官方版里没有使用）│ └─utilities 一些基本的工具类└─test 单元测试

// frame::sender_for_compiled_frameframe frame::sender_for_compiled_frame(RegisterMap* map) const { assert(map != NULL, "map must be set"); .... }

# ifndef PRODUCTvoid InstanceKlass::print_dependent_nmethods(bool verbose) { dependencies().print_dependent_nmethods(verbose);}
bool InstanceKlass::is_dependent_nmethod(nmethod* nm) { return dependencies().is_dependent_nmethod(nm);}# endif //PRODUCT

- thread_linux_86.cpp- thread_bsd_86.cpp - thread_solaris_86.cpp- thread_windows_86.cpp

- frame_x86.cpp- frame_arm.cpp- frame_s390.cpp- frame_ppc.cpp

// 这里是向上对齐的宏。比如size是20. 对齐大小alignment是8, 则尝试对齐到24=8*3. # define align_size_up_(size, alignment) (((size) + ((alignment) - 1)) & ~((alignment) - 1)) // 这里是向下对齐的宏。比如size是20. 对齐大小alignment是8, 则尝试对齐到16=8*2. # define align_size_down_(size, alignment) ((size) & ~((alignment) - 1)) 

// 这里偷了个巧。LogHeapWordSize在64位下默认是3, 这里等于是除以8. 然后通过左边添加(HeapWordSize-1)来保证除后的HeapWord个数刚好能包住bytes。 julong size_in_words = ((size_in_bytes + (HeapWordSize-1)) >> LogHeapWordSize);

# define ARENA_ALIGN_M1 (((size_t)(ARENA_AMALLOC_ALIGNMENT)) - 1)# define ARENA_ALIGN_MASK (~((size_t)ARENA_ALIGN_M1))# define ARENA_ALIGN(x) ((((size_t)(x)) + ARENA_ALIGN_M1) & ARENA_ALIGN_MASK)