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Commitacc2158

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author
duyang
committed
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1 parent4b2174c commitacc2158

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4 files changed

+23
-5
lines changed

4 files changed

+23
-5
lines changed

‎hotspot/src/share/vm/classfile/javaClasses.cpp

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -673,6 +673,7 @@ void java_lang_Class::compute_offsets() {
673673
assert(!offsets_computed,"offsets should be initialized only once");
674674
offsets_computed =true;
675675

676+
//调用宏展开后的 static klassOop Class_klass() { return check_klass_Pre(_well_known_klasses[Class_klass_knum]); } 函数
676677
klassOop k =SystemDictionary::Class_klass();
677678
// The classRedefinedCount field is only present starting in 1.5,
678679
// so don't go fatal.
@@ -3159,7 +3160,8 @@ void JavaClasses::check_offsets() {
31593160
valid &=check_constant(klass_name, cpp_klass_name :: field_name, #field_name, field_sig)
31603161

31613162
// java.lang.String
3162-
3163+
//宏展开
3164+
//valid &= check_offset("java/lang/String", java_lang_String :: value_offset, "value", "[C")
31633165
CHECK_OFFSET("java/lang/String", java_lang_String, value,"[C");
31643166
CHECK_OFFSET("java/lang/String", java_lang_String, offset,"I");
31653167
CHECK_OFFSET("java/lang/String", java_lang_String, count,"I");

‎hotspot/src/share/vm/classfile/systemDictionary.hpp

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -424,6 +424,9 @@ class SystemDictionary : AllStatic {
424424
public:
425425
#defineWK_KLASS_DECLARE(name, ignore_symbol, option) \
426426
static klassOopname() {return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); }
427+
//注意宏展开顺序
428+
//先展开 WK_KLASSES_DO(template) ==> WK_KLASS_DECLARE作为template
429+
//XXX_klass_knum 在 SystemDictionary.hpp的enum WKID中定义
427430
WK_KLASSES_DO(WK_KLASS_DECLARE);
428431
#undef WK_KLASS_DECLARE
429432

‎hotspot/src/share/vm/runtime/init.cpp

Lines changed: 16 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -99,13 +99,15 @@ jint init_globals() {
9999
HandleMark hm;
100100
//初始化一些计数器
101101
management_init();
102-
//初始化java字节码指令
102+
//初始化java字节码指令 byte 数值
103103
bytecodes_init();
104104
//初始化system class loader
105105
classLoader_init();
106-
//
106+
//JIT(及时编译)产生的机器码的缓存
107107
codeCache_init();
108+
//虚拟机版本信息
108109
VM_Version_init();
110+
//jit编译成的机器码入口 c1 编译
109111
stubRoutines_init1();
110112
jint status =universe_init();// dependent on codeCache_init and stubRoutines_init
111113
if (status != JNI_OK)
@@ -118,26 +120,36 @@ jint init_globals() {
118120
marksweep_init();
119121
//控制
120122
accessFlags_init();
121-
//
123+
//字节码table
122124
templateTable_init();
125+
//
123126
InterfaceSupport_init();
127+
//jit相关
124128
SharedRuntime::generate_stubs();
125129
universe2_init();// dependent on codeCache_init and stubRoutines_init
130+
//java对象引用处理
126131
referenceProcessor_init();
132+
//初始化全局/局部jni handles
127133
jni_handles_init();
128134
#ifndef VM_STRUCTS_KERNEL
129135
vmStructs_init();
130136
#endif// VM_STRUCTS_KERNEL
131-
137+
//初始化虚表 用于动态绑定
132138
vtableStubs_init();
139+
//JIT 内联cache
133140
InlineCacheBuffer_init();
141+
//
134142
compilerOracle_init();
143+
//CompilationPolicy 用于选择jit编译的方法或者代码块
135144
compilationPolicy_init();
136145
VMRegImpl::set_regName();
137146

138147
if (!universe_post_init()) {
139148
return JNI_ERR;
140149
}
150+
//计算/检查 jvm预加载的 java.lang.*等 well-known-class
151+
//保证java.lang包下类的正确性，不能轻易被修改，替换
152+
//初始化过field 过滤器
141153
javaClasses_init();// must happen after vtable initialization
142154
stubRoutines_init2();// note: StubRoutines need 2-phase init
143155

‎hotspot/src/share/vm/runtime/thread.cpp

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -3126,6 +3126,7 @@ jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) {
31263126
ObjectMonitor::Initialize() ;
31273127

31283128
// Initialize global modules
3129+
//初始化全局模块
31293130
jint status =init_globals();
31303131
if (status != JNI_OK) {
31313132
delete main_thread;

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