Mac编译OpenJDK7(8)和Eclipse调试Hotspot

一、前言

1. Java是我主要的生产语言，但对JVM不是很了解，最近也在看《深入理解Java虚拟机 第二版》，所以想亲手编译OpenJDK和调试HotSpot虚拟机
2. 系统是15年的Mac OS X（10.11.5），而OpenJDK7却是13的，完全按照书本来，肯定是编译不过的，本文记录了在这个痛苦过程中遇到的坑，希望对其他人能有所帮助
3. OpenJDK8使用configure && make的方式，比较容易就编译通过
4. 感谢westion717，chenjingbo，裴银祥的分享，最后会列出相应的参考链接

二、下载

1. openjdk-7u40-fcs-src-b43-26_aug_2013.zip
2. openjdk-8-src-b132-03_mar_2014.zip
3. OpenJDK7 Build README
4. OpenJDK8 Build README
5. Eclipse CPP NEON

三、 系统环境

KeyValueOS10.11.5 El CapitanApple LLVM version7.3.0 (clang-703.0.31)makeGNU Make 3.81Xcode7.3.1Ant1.9.7LLVM GCC(clang)4.2.1zip3.0unzip5.52freeType2.6.1

四、编译OpenJDK7

1. 环境依赖

KeyValueGNU make≧ 3.81Bootstrap JDK≧ JDK6 , < JDK7XCode≧ 4.1Ant≧ 1.7.1LLVM GCC≧ 4.2.1zip≧ 2.2unzip≧ 5.12freeType≧ 2.3

2. 环境变量（openjdk7.bash）

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# 设定语言选项，必须设置export LANG=C# Mac平台，C编译器不再是GCC，是clangexport CC=clang# 跳过clang的一些严格的语法检查，不然会将N多的警告作为Errorexport COMPILER_WARNINGS_FATAL=false# 链接时使用的参数export LFLAGS='-Xlinker -lstdc++'# 是否使用clangexport USE_CLANG=true# 使用64位数据模型export LP64=1# 告诉编译平台是64位，不然会按32位来编译export ARCH_DATA_MODEL=64# 允许自动下载依赖export ALLOW_DOWNLOADS=true# 并行编译的线程数，编译时间长，为了不影响其他工作，我选择为2export HOTSPOT_BUILD_JOBS=2export ALT_PARALLEL_COMPILE_JOBS=2# 是否跳过与先前版本的比较export SKIP_COMPARE_IMAGES=true# 是否使用预编译头文件，加快编译速度export USE_PRECOMPILED_HEADER=true# 是否使用增量编译export INCREMENTAL_BUILD=true# 编译内容export BUILD_LANGTOOLS=trueexport BUILD_JAXP=trueexport BUILD_JAXWS=trueexport BUILD_CORBA=trueexport BUILD_HOTSPOT=trueexport BUILD_JDK=true# 编译版本export SKIP_DEBUG_BUILD=trueexport SKIP_FASTDEBUG_BUILD=falseexport DEBUG_NAME=debug# 避开javaws和浏览器Java插件之类的部分的buildexport BUILD_DEPLOY=falseexport BUILD_INSTALL=false# FreeTypeexport FREETYPE_LIB_PATH=/usr/X11R6/libexport FREETYPE_HEADERS_PATH=/usr/X11R6/includeexport ALT_FREETYPE_LIB_PATH=/usr/local/Cellar/freetype/2.6_1/libexport ALT_FREETYPE_HEADERS_PATH=/usr/local/Cellar/freetype/2.6_1/include# 目标编译版本信息export MILESTONE=internalexport BUILD_NUMBER=b25# 指定bootstrap jdk的路径。反引号的意思是执行这段shell代码后得到的结果作为该环境变量的值export ALT_BOOTDIR=`/usr/libexec/java_home -v 1.6`# 编译结果的输出路径export ALT_OUTPUTDIR=/Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk/build# ANTexport ANT_HOME=/Users/zhongmingmao/Downloads/apache-ant-1.9.7# 取消环境变量的设置，减少警告unset JAVA_HOMEunset CLASSPATHunset LD_LIBRARY_PATH

3. 加载并检查环境变量

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# 加载环境变量source ../../openjdk7.bash# 检查环境变量make sanity# 检查结果（仅仅显示关键信息）Build Machine Information:   build machine = MacBuild Directory Structure:   CWD = /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk   TOPDIR = .   LANGTOOLS_TOPDIR = ./langtools   JAXP_TOPDIR = ./jaxp   JAXWS_TOPDIR = ./jaxws   CORBA_TOPDIR = ./corba   HOTSPOT_TOPDIR = ./hotspot   JDK_TOPDIR = ./jdkBuild Directives:   BUILD_LANGTOOLS = true   BUILD_JAXP = true   BUILD_JAXWS = true   BUILD_CORBA = true   BUILD_HOTSPOT = true   BUILD_JDK    = trueHotspot Settings:      HOTSPOT_BUILD_JOBS  = 2      HOTSPOT_OUTPUTDIR   = /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk/build/hotspot/outputdir      HOTSPOT_EXPORT_PATH = /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk/build/hotspot/importBootstrap Settings:  BOOTDIR = /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home    ALT_BOOTDIR = /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home  BOOT_VER = 1.6.0 [requires at least 1.6]  OUTPUTDIR = /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk/build    ALT_OUTPUTDIR = /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk/build  ABS_OUTPUTDIR = /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk/buildBuild Tool Settings:  ANT_HOME = /Users/zhongmingmao/Downloads/apache-ant-1.9.7  COMPILER_PATH = /Applications/Xcode.app/Contents/Developer/usr/bin/  COMPILER_NAME = LLVM-GCC4  COMPILER_VERSION = LLVM-GCC4  CC_VER = 4.2.1 [requires at least 4.2.1]  ZIP_VER = 3.0 [requires at least 2.2]  UNZIP_VER = 5.52 [requires at least 5.12]  ANT_VER = 1.9.7 [requires at least 1.7.1]  TEMPDIR = /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk/build/tmpBuild Directives:  OPENJDK = true  COMPILE_APPROACH = parallel  PARALLEL_COMPILE_JOBS = 2    ALT_PARALLEL_COMPILE_JOBS = 2  COMPILER_WARNINGS_FATAL = false  INCREMENTAL_BUILD = trueBuild Platform Settings:  USER = zhongmingmao  PLATFORM = macosx  ARCH = x86_64  LIBARCH = x86_64  ARCH_FAMILY = x86_64  ARCH_DATA_MODEL = 64  ARCHPROP = x86_64  OS_VERSION = 15.5.0 [requires at least 11.2]  OS_VARIANT_NAME = MacOSX  OS_VARIANT_VERSION = 10.11.5  MB_OF_MEMORY = 8192GNU Make Settings:  MAKE = /Applications/Xcode.app/Contents/Developer/usr/bin/make  MAKE_VER = 3.81 [requires at least 3.81]  MAKECMDGOALS = sanity  SHELL = /bin/shTarget Build Versions:  JDK_VERSION = 1.7.0  MILESTONE = internal  RELEASE = 1.7.0-internal-debug  FULL_VERSION = 1.7.0-internal-debug-b25  BUILD_NUMBER = b25External File/Binary Locations:  LANGTOOLS_DIST =    ALT_LANGTOOLS_DIST = /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk/build/langtools/dist  CORBA_DIST =    ALT_CORBA_DIST = /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk/build/corba/dist  JAXP_DIST =    ALT_JAXP_DIST = /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk/build/jaxp/dist  JAXWS_DIST =    ALT_JAXWS_DIST = /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk/build/jaxws/dist  HOTSPOT_IMPORT_PATH = /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk/build/hotspot/import    ALT_HOTSPOT_IMPORT_PATH = /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk/build/hotspot/import  HOTSPOT_SERVER_PATH = /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk/build/hotspot/import/jre/lib/server  CACERTS_FILE = ./../src/share/lib/security/cacerts  CUPS_HEADERS_PATH = /usr/includeOpenJDK-specific settings:  FREETYPE_HEADERS_PATH = /usr/local/Cellar/freetype/2.6_1/include    ALT_FREETYPE_HEADERS_PATH = /usr/local/Cellar/freetype/2.6_1/include  FREETYPE_LIB_PATH = /usr/local/Cellar/freetype/2.6_1/lib    ALT_FREETYPE_LIB_PATH = /usr/local/Cellar/freetype/2.6_1/libPrevious JDK Settings:  PREVIOUS_JDK_VERSION = 1.6.0  PREVIOUS_RELEASE_IMAGE = /Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/HomeSanity check passed.

4. 编译Debug版本

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# 编译命令make debug_build 2>&1 |tee $ALT_OUTPUTDIR/build.log# 编译结果#-- Build times ----------Target debug_buildStart 2016-07-13 00:21:16End   2016-07-13 00:30:2500:00:12 corba00:00:10 hotspot00:00:02 jaxp00:00:05 jaxws00:08:35 jdk00:00:03 langtools00:09:09 TOTAL-------------------------# 运行编译结果./build-debug/j2sdk-image/bin/java -versionopenjdk version "1.7.0-internal-debug"OpenJDK Runtime Environment (build 1.7.0-internal-debug-b25)OpenJDK 64-Bit Server VM (build 24.0-b56-jvmg, mixed mode)

5. 编译过程中遇到的坑(按出现顺序记录)

5.1 乱码问题

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# 具体报错openjdk/build/../build-debug/corba/gensrc/org/omg/PortableServer/AdapterActivatorOperations.java:8: ´íÎó: ±àÂëasciiµÄ    ²»¿ÉÓ³Éä×Ö·û* 2016??7??12?? ?????? ????05??39??22?? CST# 解决办法find build-debug/corba/gensrc/org/ -name '*.java' | while read p; do native2ascii -encoding UTF-8 $p > tmpj; mv tmpj $p; doneexport _JAVA_OPTIONS=-Dfile.encoding=ASCII

5.2 clang不支持参数-fpch-deps

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# 具体报错clang: error: unknown argument: '-fpch-deps'# 解决方法1. 首先查找对应的配置文件find . -type f ! -name "*.java" | xargs grep -r "\-fpch\-deps"1.1 匹配的查找结果如下（Mac来源于BSD，选择BSD）./hotspot/make/bsd/makefiles/gcc.make:DEPFLAGS = -fpch-deps -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)./hotspot/make/linux/makefiles/gcc.make:DEPFLAGS = -fpch-deps -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)./hotspot/make/solaris/makefiles/gcc.make:DEPFLAGS = -fpch-deps -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)2 修改hotspot/make/bsd/makefiles/gcc.make2.1 注释216-218行# Flags for generating make dependency flags.# ifneq ("${CC_VER_MAJOR}", "2")# DEPFLAGS = -fpch-deps -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)# endif2.2 在218行下添加下面代码DEPFLAGS = -MMD -MP -MF $(DEP_DIR)/$(@:%=%.d)ifeq ($(USE_CLANG),)  ifneq ($(CC_VER_MAJOR), 2)    DEPFLAGS += -fpch-deps  endifendif

5.3 形参默认值问题

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# 具体报错openjdk/hotspot/src/share/vm/code/relocInfo.hpp:374:27: error: friend declaration specifying a default argument must      be a definitioninline friend relocInfo prefix_relocInfo(int datalen = 0);openjdk/hotspot/src/share/vm/code/relocInfo.hpp:469:18: error: friend declaration specifying a default argument must      be the only declarationinline relocInfo prefix_relocInfo(int datalen) {openjdk/hotspot/src/share/vm/code/relocInfo.hpp:470:21: error: 'fits_into_immediate' is a protected member of 'reloc     Info'assert(relocInfo::fits_into_immediate(datalen), "datalen in limits");openjdk/hotspot/src/share/vm/code/relocInfo.hpp:471:59: error: 'RAW_BITS' is a protected member of 'relocInfo'return relocInfo(relocInfo::data_prefix_tag, relocInfo::RAW_BITS, relocInfo::datalen_tag | datalen);openjdk/hotspot/src/share/vm/code/relocInfo.hpp:471:10: error: calling a protected constructor of class 'relocInfo'return relocInfo(relocInfo::data_prefix_tag, relocInfo::RAW_BITS, relocInfo::datalen_tag | datalen);# 解决办法# 修改relocInfo.hpp（路径：hotspot/src/share/vm/code/relocInfo.hpp）修改374行inline friend relocInfo prefix_relocInfo(int datalen);修改469行inline relocInfo prefix_relocInfo(int datalen = 0) {   assert(relocInfo::fits_into_immediate(datalen), "datalen in limits");   return relocInfo(relocInfo::data_prefix_tag, relocInfo::RAW_BITS, relocInfo::datalen_tag | datalen);}

5.4 十年问题

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# 具体报错Error: time is more than 10 years from present: 1136059200000java.lang.RuntimeException: time is more than 10 years from present: 1136059200000  at build.tools.generatecurrencydata.GenerateCurrencyData.makeSpecialCaseEntry(GenerateCurrencyData.java:285)  at build.tools.generatecurrencydata.GenerateCurrencyData.buildMainAndSpecialCaseTables(GenerateCurrencyData.java:225)  at build.tools.generatecurrencydata.GenerateCurrencyData.main(GenerateCurrencyData.java:154)# 解决办法# 修改CurrencyData.properties（路径：jdk/src/share/classes/java/util/CurrencyData.properties）修改108行AZ=AZM;2009-12-31-20-00-00;AZN修改381行MZ=MZM;2009-06-30-22-00-00;MZN修改443行RO=ROL;2009-06-30-21-00-00;RON修改535行TR=TRL;2009-12-31-22-00-00;TRY修改561行VE=VEB;2009-01-01-04-00-00;VEF

5.5 非空函数不返回值的问题一

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# 具体报错../../../src/solaris/native/java/net/net_util_md.c:117:9: error: non-void function 'getDefaultScopeID' should return a value [-Wreturn-type]        CHECK_NULL(c);        ^../../../src/share/native/java/net/net_util.h:45:40: note: expanded from macro 'CHECK_NULL'#define CHECK_NULL(x) if ((x) == NULL) return;                                       ^../../../src/solaris/native/java/net/net_util_md.c:119:9: error: non-void function 'getDefaultScopeID' should return a value [-Wreturn-type]        CHECK_NULL(c);        ^../../../src/share/native/java/net/net_util.h:45:40: note: expanded from macro 'CHECK_NULL'#define CHECK_NULL(x) if ((x) == NULL) return;# 解决办法# 修改net_util_md.c（路径：jdk/src/solaris/native/java/net/net_util_md.c）修改117、119行CHECK_NULL_RETURN(c , 0);

5.6 权限问题

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# 具体报错Permission denied - ./src/core/PrimitiveCoder.hs (Errno::EACCES)# 解决办法chmod 755 jdk/src/macosx/native/jobjc/src/core/PrimitiveCoder.hs

5.7 clang不支持GC的问题

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# 具体报错clang: error: garbage collection is no longer supported# 解决办法1. 首先查找相应的配置文件find . -type f ! -name "*.log" | xargs grep -r "GCC_ENABLE_OBJC_GC"1.1 匹配的查找结果如下nary file ./build-debug/JObjC.dst/dgph matches./jdk/src/macosx/native/jobjc/JObjC.xcodeproj/project.pbxproj:                                GCC_ENABLE_OBJC_GC = supported;./jdk/src/macosx/native/jobjc/JObjC.xcodeproj/project.pbxproj:                                GCC_ENABLE_OBJC_GC = supported;2. 修改project.pbxproj（路径：./jdk/src/macosx/native/jobjc/JObjC.xcodeproj/project.pbxproj）修改705、713行GCC_ENABLE_OBJC_GC = "";

5.8 返回值大于返回类型精度的问题

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# 具体报错openjdk/build-debug/JObjC.build/src/jobjc/com/apple/jobjc/appkit/AppKitFramework.java:355: ?????     public final float NSEventDurationForever(){ return 1.797693134862316E+308f; }# 解决办法1. 修改bridgesupport.gmk（路径：jdk/src/macosx/native/jobjc/bridgesupport.gmk）修改54行all:2. 修改AppKitFull.bridgesupport（路径：build-debug/stable_bridge_metadata/AppKitFull.bridgesupport）修改1485行<enum name='NSEventDurationForever' value='3.40282E+38'/>3. 修改AppKitFramework.java（路径：build-debug/JObjC.build/src/jobjc/com/apple/jobjc/appkit/AppKitFramework.java）修改355行public final double NSEventDurationForever(){ return 3.40282E+38d; }

5.9 非空函数不返回值的问题二

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# 具体报错openjdk/jdk/src/macosx/native/sun/awt/AWTEvent.m:385:24: error: non-void function 'NsGetDeadKeyChar' should return a value [-Wreturn-type]    if (uchr == nil) { return; }# 解决办法# 修改AWTEvent.m（路径：jdk/src/macosx/native/sun/awt/AWTEvent.m）修改385行if (uchr == nil) { return 0; }

五、Eclipse调试Hotspot

1. 导入项目

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# 操作file -> new -> Makefile Project with Existing Code# 备注hotspot目录 : 在OpenJDK源代码根目录下

1. 修改项目属性

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# 操作项目右键 -> properites -> C/C++ Build

1.1 Builder Settings

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# 备注Build command : make -f Makefile ALT_BOOTDIR=/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home ARCH_DATA_MODEL=64 LANG=C COMPILER_WARNINGS_FATAL=false LFLAGS='-Xlinker -lstdc++' USE_CLANG=true LP64=1 CC=clang HOTSPOT_BUILD_JOBS=2 SHOW_ALL_WARNINGS=falseBuild directory : ${workspace_loc:/hotspot}/make

1.2 Behavior

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# 备注Build(Incremental build) : jvmg

2. 构建项目前准备

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# 目的防止进度条出现"Remote System Explorer Operation"，导致Eclipse卡顿# 操作一Eclipse -> Preferences -> General -> Startup and Shutdown.- Uncheck RSE UI.# 操作二Eclipse -> Preferences -> Remote Systems.- Uncheck Re-open Remote Systems view to previous state.

3. 构建项目

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# 操作Project -> Build Project -> 漫长地等待# 构建结果（只显示最后的内容）.....echo "Doing vm.make build:"Doing vm.make build:All done.cd bsd_amd64_compiler2/jvmg && ./test_gammaJAVA_HOME must point to a 64-bit OpenJDK.19:49:47 Build Finished (took 11s.789ms)

4. 调试HotSpot

4.1 配置全局GDB路径

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# 操作Eclipse -> Preferences -> C/C++ -> Debug -> GDB# 备注GDB debugger : /usr/local/bin/gdb

4.2 Debug配置

4.2.1 新建C/C++ Application

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# 操作Debug Configurations -> new -> C/C++ Application# 启动程序C/C++ Application : /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk_copy/hotspot/build/bsd/bsd_amd64_compiler2/jvmg/gamma

4.2.2 配置Arguments

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Program arguments : Hello # 自己编译的class文件

4.2.3 配置Environment（新增三个环境变量）

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# 1. 加上自己的class路径，否则会ClassNotFoundCLASSPATH : .:/Users/zhongmingmao/Documents/source_code/java/openjdk/my_class# 2. 配置JAVA_HOME，即编译OpenJDK7时产生的目录，否则会报下面错误  JAVA_HOME must point to a valid JDK/JRE to run gamma  Error: could not find libjava.dylib  Error: could not find Java 2 Runtime Environment.JAVA_HOME : /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk_copy/build-debug/j2sdk-image# 3. 配置LD_LIBRARY_PATH，即Eclipse编译HotSpot产生的目录，当然也可以使用编译OpenJDK7时产生的目录，否则会报下面的错误  dyld: Library not loaded: @rpath/libjvm.dylib    Referenced from: /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk_copy/hotspot/build/bsd/bsd_amd64_compiler2/jvmg/gamma    Reason: image not foundLD_LIBRARY_PATH : /Users/zhongmingmao/Documents/source_code/java/openjdk/openjdk7/openjdk_copy/hotspot/build/bsd/bsd_amd64_compiler2/jvmg

4.2.4 配置Debugger

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GDB debugger : /usr/local/bin/gdb

4.3 Debug视图

六、编译OpenJDK8

1. 与OpenJDK7的区别

• The build is now a configure && make style build
• Ant is no longer used when building the OpenJDK
• Any GNU make 3.81 or newer should work
• Use of ALT_* environment variables for configuring the build is no longer supported

2. 环境依赖

KeyValueGNU make≧ 3.81Bootstrap JDK≧ JDK7U7 , < JDK8XCode≧ 4.5.2

3. 修改部分代码和配置

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# 1. 修改generated-configure.sh（路径：common/autoconf/generated-configure.sh）注释20061行// as_fn_error $? "GCC compiler is required. Try setting --with-tools-dir." "$LINENO" 5注释21640行// as_fn_error $? "GCC compiler is required. Try setting --with-tools-dir." "$LINENO" 5# 2. 修改relocInfo.hpp（路径：hotspot/src/share/vm/code/relocInfo.hpp）修改376行inline friend relocInfo prefix_relocInfo(int datalen);修改472行inline relocInfo prefix_relocInfo(int datalen = 0) {   assert(relocInfo::fits_into_immediate(datalen), "datalen in limits");   return relocInfo(relocInfo::data_prefix_tag, relocInfo::RAW_BITS, relocInfo::datalen_tag | datalen);}

4. configure

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# 用法sh ./configure --help=short# 实际命令参数sh configure --with-debug-level=slowdebug --with-boot-jdk=`/usr/libexec/java_home -v 1.7` --with-target-bits=64 --with-jvm-variants=server --with-jdk-variant=normal --with-milestone=internal --with-update-version=b25 --with-build-number=b25 --with-num-cores=2 --with-jobs=4 CC=clang CXX=clang++# 输出（仅显示关键信息）Configuration summary:* Debug level:    slowdebug* JDK variant:    normal* JVM variants:   server* OpenJDK target: OS: macosx, CPU architecture: x86, address length: 64Tools summary:* Boot JDK:       java version "1.7.0_79" Java(TM) SE Runtime Environment (build 1.7.0_79-b15) Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)  (at /Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home)* C Compiler:     Apple LLVM version (clang-703.0.31) version 7.3.0 (clang-703.0.31) (at /usr/bin/clang)* C++ Compiler:   Apple LLVM version (clang-703.0.31) version 7.3.0 (clang-703.0.31) (at /usr/bin/clang++)Build performance summary:* Cores to use:   4* Memory limit:   8192 MB* ccache status:  installed, but disabled (version older than 3.1.4)

5. make

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# 用法make help# 实际命令参数make COMPILER_WARNINGS_FATAL=false LFLAGS='-Xlinker -lstdc++' CC=clang USE_CLANG=true LP64=1# 输出（仅显示关键信息）----- Build times -------Start 2016-07-10 16:05:19End   2016-07-10 16:12:4100:00:44 corba00:01:32 hotspot00:00:23 jaxp00:00:36 jaxws00:04:06 jdk00:00:00 langtools00:07:22 TOTAL-------------------------

6. java -version

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# 命令build/macosx-x86_64-normal-server-slowdebug/jdk/bin/java -version# 输出openjdk version "1.8.0_b25-internal-debug"OpenJDK Runtime Environment (build 1.8.0_b25-internal-debug-b25)OpenJDK 64-Bit Server VM (build 25.0-b70-debug, mixed mode)

七、参考资料

1. 自己动手编译JDK并单步调试hotspot（Mac）
2. 在eclipse中调试hotspot
3. mac上eclipse用gdb调试