jdk 编译
· 3 min read
前言
jdk 某个版本之后是自举的，所以编译jdk之前先有一个jdk。 主要参照https://openjdk.java.net/groups/build/doc/building.html
下载jdk
字节码
src\hotspot\share\interpreter\bytecodes.cpp
BytecodeInterpreter::run
(gdb) bt
#0 TemplateTable::if_icmp (cc=4294967295) at /home/ubuntu/jdk/src/hotspot/cpu/x86/templateTable_x86.cpp:2381
#1 0x00007ffff70a9519 in Template::generate (this=0x7ffff7d60be0 <TemplateTable::_template_table+5088>, masm=0x7ffff0019760) at /home/ubuntu/jdk/src/hotspot/share/interpreter/templateTable.cpp:63
#2 0x00007ffff709bde8 in TemplateInterpreterGenerator::generate_and_dispatch (this=0x7ffff5c5da40, t=0x7ffff7d60be0 <TemplateTable::_template_table+5088>, tos_out=vtos)
at /home/ubuntu/jdk/src/hotspot/share/interpreter/templateInterpreterGenerator.cpp:392
#3 0x00007ffff709b934 in TemplateInterpreterGenerator::set_short_entry_points (this=0x7ffff5c5da40, t=0x7ffff7d60be0 <TemplateTable::_template_table+5088>,
bep=@0x7ffff5c5d398: 0x7fffe1008a37 "H\211d$\330H\201", <incomplete sequence \354\200>, cep=@0x7ffff5c5d3a0: 0x7fffe1008a37 "H\211d$\330H\201", <incomplete sequence \354\200>,
sep=@0x7ffff5c5d3a8: 0x7fffe1008a37 "H\211d$\330H\201", <incomplete sequence \354\200>, aep=@0x7ffff5c5d3b0: 0x7fffe1008a37 "H\211d$\330H\201", <incomplete sequence \354\200>,
iep=@0x7ffff5c5d3b8: 0x7fffe1028807 "PSQRH\213M\330H\205\311\017\204", <incomplete sequence \312>, lep=@0x7ffff5c5d3c0: 0x7fffe1008a37 "H\211d$\330H\201", <incomplete sequence \354\200>,
fep=@0x7ffff5c5d3c8: 0x7fffe1008a37 "H\211d$\330H\201", <incomplete sequence \354\200>, dep=@0x7ffff5c5d3d0: 0x7fffe1008a37 "H\211d$\330H\201", <incomplete sequence \354\200>,
vep=@0x7ffff5c5d3d8: 0x7fffe1028800 "\213\004$H\203\304\bPSQRH\213M\330H\205\311\017\204", <incomplete sequence \312>) at /home/ubuntu/jdk/src/hotspot/share/interpreter/templateInterpreterGenerator.cpp:356
#4 0x00007ffff709b46c in TemplateInterpreterGenerator::set_entry_points (this=0x7ffff5c5da40, code=Bytecodes::_if_icmpeq) at /home/ubuntu/jdk/src/hotspot/share/interpreter/templateInterpreterGenerator.cpp:325
#5 0x00007ffff709b06d in TemplateInterpreterGenerator::set_entry_points_for_all_bytes (this=0x7ffff5c5da40) at /home/ubuntu/jdk/src/hotspot/share/interpreter/templateInterpreterGenerator.cpp:281
#6 0x00007ffff709ac13 in TemplateInterpreterGenerator::generate_all (this=0x7ffff5c5da40) at /home/ubuntu/jdk/src/hotspot/share/interpreter/templateInterpreterGenerator.cpp:234
#7 0x00007ffff70993cb in TemplateInterpreterGenerator::TemplateInterpreterGenerator (this=0x7ffff5c5da40, _code=0x7ffff00a28b0) at /home/ubuntu/jdk/src/hotspot/share/interpreter/templateInterpreterGenerator.cpp:42
#8 0x00007ffff7097e5b in TemplateInterpreter::initialize () at /home/ubuntu/jdk/src/hotspot/share/interpreter/templateInterpreter.cpp:56
#9 0x00007ffff69e06a2 in interpreter_init () at /home/ubuntu/jdk/src/hotspot/share/interpreter/interpreter.cpp:116
#10 0x00007ffff69bbe73 in init_globals () at /home/ubuntu/jdk/src/hotspot/share/runtime/init.cpp:119
#11 0x00007ffff70d59b7 in Threads::create_vm (args=0x7ffff5c5de20, canTryAgain=0x7ffff5c5dd2b) at /home/ubuntu/jdk/src/hotspot/share/runtime/thread.cpp:3728
#12 0x00007ffff6adcd5d in JNI_CreateJavaVM_inner (vm=0x7ffff5c5de78, penv=0x7ffff5c5de80, args=0x7ffff5c5de20) at /home/ubuntu/jdk/src/hotspot/share/prims/jni.cpp:3945
#13 0x00007ffff6add0b1 in JNI_CreateJavaVM (vm=0x7ffff5c5de78, penv=0x7ffff5c5de80, args=0x7ffff5c5de20) at /home/ubuntu/jdk/src/hotspot/share/prims/jni.cpp:4036
#14 0x00007ffff7fba88c in InitializeJVM (pvm=0x7ffff5c5de78, penv=0x7ffff5c5de80, ifn=0x7ffff5c5ded0) at /home/ubuntu/jdk/src/java.base/share/native/libjli/java.c:1527
#15 0x00007ffff7fb7447 in JavaMain (_args=0x7fffffffb040) at /home/ubuntu/jdk/src/java.base/share/native/libjli/java.c:414
#16 0x00007ffff7d7a609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#17 0x00007ffff7ed8293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
类加载
Thread 2 "java" hit Breakpoint 3, SystemDictionary::load_instance_class (class_name=0x7fffcc2d90f0, class_loader=..., __the_thread__=0x7ffff001b800)
at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/classfile/systemDictionary.cpp:1386
1386 InstanceKlass* SystemDictionary::load_instance_class(Symbol* class_name, Handle class_loader, TRAPS) {
(gdb) bt
#0 SystemDictionary::load_instance_class (class_name=0x7fffcc2d90f0, class_loader=..., __the_thread__=0x7ffff001b800)
at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/classfile/systemDictionary.cpp:1386
#1 0x00007ffff61bf8ab in SystemDictionary::resolve_instance_class_or_null (name=0x7fffcc2d90f0, class_loader=..., protection_domain=..., __the_thread__=0x7ffff001b800)
at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/classfile/systemDictionary.cpp:854
#2 0x00007ffff61bdcf8 in SystemDictionary::resolve_instance_class_or_null_helper (class_name=0x7fffcc2d90f0, class_loader=..., protection_domain=..., __the_thread__=0x7ffff001b800)
at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/classfile/systemDictionary.cpp:272
#3 0x00007ffff61bdb5e in SystemDictionary::resolve_or_null (class_name=0x7fffcc2d90f0, class_loader=..., protection_domain=..., __the_thread__=0x7ffff001b800)
at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/classfile/systemDictionary.cpp:255
#4 0x00007ffff61bd7d1 in SystemDictionary::resolve_or_fail (class_name=0x7fffcc2d90f0, class_loader=..., protection_domain=..., throw_error=true, __the_thread__=0x7ffff001b800)
at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/classfile/systemDictionary.cpp:203
#5 0x00007ffff61bdae8 in SystemDictionary::resolve_or_fail (class_name=0x7fffcc2d90f0, throw_error=true, __the_thread__=0x7ffff001b800)
at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/classfile/systemDictionary.cpp:245
#6 0x00007ffff61c3490 in SystemDictionary::resolve_wk_klass (id=SystemDictionary::Object_klass_knum, __the_thread__=0x7ffff001b800)
at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/classfile/systemDictionary.cpp:1938
#7 0x00007ffff61c35c5 in SystemDictionary::resolve_wk_klasses_until (limit_id=SystemDictionary::Cloneable_klass_knum, start_id=@0x7ffff7fbc974: SystemDictionary::Object_klass_knum,
__the_thread__=0x7ffff001b800) at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/classfile/systemDictionary.cpp:1948
#8 0x00007ffff5c5c46d in SystemDictionary::resolve_wk_klasses_through (end_id=SystemDictionary::Class_klass_knum, start_id=@0x7ffff7fbc974: SystemDictionary::Object_klass_knum,
__the_thread__=0x7ffff001b800) at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/classfile/systemDictionary.hpp:391
#9 0x00007ffff61c37a3 in SystemDictionary::resolve_well_known_classes (__the_thread__=0x7ffff001b800) at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/classfile/systemDictionary.cpp:1991
#10 0x00007ffff61c32d8 in SystemDictionary::initialize (__the_thread__=0x7ffff001b800) at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/classfile/systemDictionary.cpp:1898
#11 0x00007ffff623b65c in Universe::genesis (__the_thread__=0x7ffff001b800) at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/memory/universe.cpp:329
#12 0x00007ffff623dd21 in universe2_init () at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/memory/universe.cpp:953
#13 0x00007ffff5a575e7 in init_globals () at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/runtime/init.cpp:125
#14 0x00007ffff620ecbe in Threads::create_vm (args=0x7ffff7fbce20, canTryAgain=0x7ffff7fbcd2b) at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/runtime/thread.cpp:3731
#15 0x00007ffff5b6b598 in JNI_CreateJavaVM_inner (vm=0x7ffff7fbce78, penv=0x7ffff7fbce80, args=0x7ffff7fbce20) at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/prims/jni.cpp:3935
#16 0x00007ffff5b6b8c2 in JNI_CreateJavaVM (vm=0x7ffff7fbce78, penv=0x7ffff7fbce80, args=0x7ffff7fbce20) at /home/dinosaur/jdk12/jdk-jdk-12-25/src/hotspot/share/prims/jni.cpp:4021
#17 0x00007ffff7bc6601 in InitializeJVM (pvm=0x7ffff7fbce78, penv=0x7ffff7fbce80, ifn=0x7ffff7fbced0) at /home/dinosaur/jdk12/jdk-jdk-12-25/src/java.base/share/native/libjli/java.c:1529
#18 0x00007ffff7bc320c in JavaMain (_args=0x7fffffffaa30) at /home/dinosaur/jdk12/jdk-jdk-12-25/src/java.base/share/native/libjli/java.c:414
#19 0x00007ffff71956db in start_thread (arg=0x7ffff7fbd700) at pthread_create.c:463
#20 0x00007ffff78ef61f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb) p class_name->_body@10
$14 = {"ja", "va", "/l", "an", "g/", "Ob", "je", "ct", "\361", <incomplete sequence \361>, "\377\377"}
解析文件流
ClassFileParser::parse_stream
find_transitive_override
重载
find_transitive_override
update_inherited_vtable
签名
Method::name_and_sig_as_C_string