jdk8-mips64-public/hotspot: src/share/vm/runtime/interfaceSupport.hpp@3582bf76420e (annotated)

src/share/vm/runtime/interfaceSupport.hpp@3582bf76420e (annotated)

src/share/vm/runtime/interfaceSupport.hpp

Thu, 27 Jan 2011 16:11:27 -0800

author: coleenp
date: Thu, 27 Jan 2011 16:11:27 -0800
changeset 2497: 3582bf76420e
parent 2314: f95d63e2154a
child 2708: 1d1603768966
permissions: -rw-r--r--

6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank

 /*
  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_RUNTIME_INTERFACESUPPORT_HPP
 #define SHARE_VM_RUNTIME_INTERFACESUPPORT_HPP
 #include "memory/gcLocker.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/mutexLocker.hpp"
 #include "runtime/orderAccess.hpp"
 #include "runtime/os.hpp"
 #include "runtime/safepoint.hpp"
 #include "runtime/vmThread.hpp"
 #include "utilities/globalDefinitions.hpp"
 #include "utilities/preserveException.hpp"
 #include "utilities/top.hpp"
 #ifdef TARGET_OS_FAMILY_linux
 # include "thread_linux.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_solaris
 # include "thread_solaris.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_windows
 # include "thread_windows.inline.hpp"
 #endif
 // Wrapper for all entry points to the virtual machine.
 // The HandleMarkCleaner is a faster version of HandleMark.
 // It relies on the fact that there is a HandleMark further
 // down the stack (in JavaCalls::call_helper), and just resets
 // to the saved values in that HandleMark.
 class HandleMarkCleaner: public StackObj {
  private:
   Thread* _thread;
  public:
   HandleMarkCleaner(Thread* thread) {
     _thread = thread;
     _thread->last_handle_mark()->push();
   }
   ~HandleMarkCleaner() {
     _thread->last_handle_mark()->pop_and_restore();
   }
  private:
   inline void* operator new(size_t size, void* ptr) {
     return ptr;
   }
 };
 // InterfaceSupport provides functionality used by the __LEAF and __ENTRY
 // macros. These macros are used to guard entry points into the VM and
 // perform checks upon leave of the VM.
 class InterfaceSupport: AllStatic {
 # ifdef ASSERT
  public:
   static long _scavenge_alot_counter;
   static long _fullgc_alot_counter;
   static long _number_of_calls;
   static long _fullgc_alot_invocation;
   // tracing
   static void trace(const char* result_type, const char* header);
   // Helper methods used to implement +ScavengeALot and +FullGCALot
   static void check_gc_alot() { if (ScavengeALot || FullGCALot) gc_alot(); }
   static void gc_alot();
   static void walk_stack_from(vframe* start_vf);
   static void walk_stack();
 # ifdef ENABLE_ZAP_DEAD_LOCALS
   static void zap_dead_locals_old();
 # endif
   static void zombieAll();
   static void unlinkSymbols();
   static void deoptimizeAll();
   static void stress_derived_pointers();
   static void verify_stack();
   static void verify_last_frame();
 # endif
  public:
   // OS dependent stuff
 #ifdef TARGET_OS_FAMILY_linux
 # include "interfaceSupport_linux.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_solaris
 # include "interfaceSupport_solaris.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_windows
 # include "interfaceSupport_windows.hpp"
 #endif
 };
 // Basic class for all thread transition classes.
 class ThreadStateTransition : public StackObj {
  protected:
   JavaThread* _thread;
  public:
   ThreadStateTransition(JavaThread *thread) {
     _thread = thread;
     assert(thread != NULL && thread->is_Java_thread(), "must be Java thread");
   }
   // Change threadstate in a manner, so safepoint can detect changes.
   // Time-critical: called on exit from every runtime routine
   static inline void transition(JavaThread *thread, JavaThreadState from, JavaThreadState to) {
     assert(from != _thread_in_Java, "use transition_from_java");
     assert(from != _thread_in_native, "use transition_from_native");
     assert((from & 1) == 0 && (to & 1) == 0, "odd numbers are transitions states");
     assert(thread->thread_state() == from, "coming from wrong thread state");
     // Change to transition state (assumes total store ordering!  -Urs)
     thread->set_thread_state((JavaThreadState)(from + 1));
     // Make sure new state is seen by VM thread
     if (os::is_MP()) {
       if (UseMembar) {
         // Force a fence between the write above and read below
         OrderAccess::fence();
       } else {
         // store to serialize page so VM thread can do pseudo remote membar
         os::write_memory_serialize_page(thread);
       }
     }
     if (SafepointSynchronize::do_call_back()) {
       SafepointSynchronize::block(thread);
     }
     thread->set_thread_state(to);
     CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();)
   }
   // transition_and_fence must be used on any thread state transition
   // where there might not be a Java call stub on the stack, in
   // particular on Windows where the Structured Exception Handler is
   // set up in the call stub. os::write_memory_serialize_page() can
   // fault and we can't recover from it on Windows without a SEH in
   // place.
   static inline void transition_and_fence(JavaThread *thread, JavaThreadState from, JavaThreadState to) {
     assert(thread->thread_state() == from, "coming from wrong thread state");
     assert((from & 1) == 0 && (to & 1) == 0, "odd numbers are transitions states");
     // Change to transition state (assumes total store ordering!  -Urs)
     thread->set_thread_state((JavaThreadState)(from + 1));
     // Make sure new state is seen by VM thread
     if (os::is_MP()) {
       if (UseMembar) {
         // Force a fence between the write above and read below
         OrderAccess::fence();
       } else {
         // Must use this rather than serialization page in particular on Windows
         InterfaceSupport::serialize_memory(thread);
       }
     }
     if (SafepointSynchronize::do_call_back()) {
       SafepointSynchronize::block(thread);
     }
     thread->set_thread_state(to);
     CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();)
   }
   // Same as above, but assumes from = _thread_in_Java. This is simpler, since we
   // never block on entry to the VM. This will break the code, since e.g. preserve arguments
   // have not been setup.
   static inline void transition_from_java(JavaThread *thread, JavaThreadState to) {
     assert(thread->thread_state() == _thread_in_Java, "coming from wrong thread state");
     thread->set_thread_state(to);
   }
   static inline void transition_from_native(JavaThread *thread, JavaThreadState to) {
     assert((to & 1) == 0, "odd numbers are transitions states");
     assert(thread->thread_state() == _thread_in_native, "coming from wrong thread state");
     // Change to transition state (assumes total store ordering!  -Urs)
     thread->set_thread_state(_thread_in_native_trans);
     // Make sure new state is seen by GC thread
     if (os::is_MP()) {
       if (UseMembar) {
         // Force a fence between the write above and read below
         OrderAccess::fence();
       } else {
         // Must use this rather than serialization page in particular on Windows
         InterfaceSupport::serialize_memory(thread);
       }
     }
     // We never install asynchronous exceptions when coming (back) in
     // to the runtime from native code because the runtime is not set
     // up to handle exceptions floating around at arbitrary points.
     if (SafepointSynchronize::do_call_back() || thread->is_suspend_after_native()) {
       JavaThread::check_safepoint_and_suspend_for_native_trans(thread);
       // Clear unhandled oops anywhere where we could block, even if we don't.
       CHECK_UNHANDLED_OOPS_ONLY(thread->clear_unhandled_oops();)
     }
     thread->set_thread_state(to);
   }
  protected:
    void trans(JavaThreadState from, JavaThreadState to)  { transition(_thread, from, to); }
    void trans_from_java(JavaThreadState to)              { transition_from_java(_thread, to); }
    void trans_from_native(JavaThreadState to)            { transition_from_native(_thread, to); }
    void trans_and_fence(JavaThreadState from, JavaThreadState to) { transition_and_fence(_thread, from, to); }
 };
 class ThreadInVMfromJava : public ThreadStateTransition {
  public:
   ThreadInVMfromJava(JavaThread* thread) : ThreadStateTransition(thread) {
     trans_from_java(_thread_in_vm);
   }
   ~ThreadInVMfromJava()  {
     trans(_thread_in_vm, _thread_in_Java);
     // Check for pending. async. exceptions or suspends.
     if (_thread->has_special_runtime_exit_condition()) _thread->handle_special_runtime_exit_condition();
   }
 };
 class ThreadInVMfromUnknown {
  private:
   JavaThread* _thread;
  public:
   ThreadInVMfromUnknown() : _thread(NULL) {
     Thread* t = Thread::current();
     if (t->is_Java_thread()) {
       JavaThread* t2 = (JavaThread*) t;
       if (t2->thread_state() == _thread_in_native) {
         _thread = t2;
         ThreadStateTransition::transition_from_native(t2, _thread_in_vm);
         // Used to have a HandleMarkCleaner but that is dangerous as
         // it could free a handle in our (indirect, nested) caller.
         // We expect any handles will be short lived and figure we
         // don't need an actual HandleMark.
       }
     }
   }
   ~ThreadInVMfromUnknown()  {
     if (_thread) {
       ThreadStateTransition::transition_and_fence(_thread, _thread_in_vm, _thread_in_native);
     }
   }
 };
 class ThreadInVMfromNative : public ThreadStateTransition {
  public:
   ThreadInVMfromNative(JavaThread* thread) : ThreadStateTransition(thread) {
     trans_from_native(_thread_in_vm);
   }
   ~ThreadInVMfromNative() {
     trans_and_fence(_thread_in_vm, _thread_in_native);
   }
 };
 class ThreadToNativeFromVM : public ThreadStateTransition {
  public:
   ThreadToNativeFromVM(JavaThread *thread) : ThreadStateTransition(thread) {
     // We are leaving the VM at this point and going directly to native code.
     // Block, if we are in the middle of a safepoint synchronization.
     assert(!thread->owns_locks(), "must release all locks when leaving VM");
     thread->frame_anchor()->make_walkable(thread);
     trans_and_fence(_thread_in_vm, _thread_in_native);
     // Check for pending. async. exceptions or suspends.
     if (_thread->has_special_runtime_exit_condition()) _thread->handle_special_runtime_exit_condition(false);
   }
   ~ThreadToNativeFromVM() {
     trans_from_native(_thread_in_vm);
     // We don't need to clear_walkable because it will happen automagically when we return to java
   }
 };
 class ThreadBlockInVM : public ThreadStateTransition {
  public:
   ThreadBlockInVM(JavaThread *thread)
   : ThreadStateTransition(thread) {
     // Once we are blocked vm expects stack to be walkable
     thread->frame_anchor()->make_walkable(thread);
     trans_and_fence(_thread_in_vm, _thread_blocked);
   }
   ~ThreadBlockInVM() {
     trans_and_fence(_thread_blocked, _thread_in_vm);
     // We don't need to clear_walkable because it will happen automagically when we return to java
   }
 };
 // This special transition class is only used to prevent asynchronous exceptions
 // from being installed on vm exit in situations where we can't tolerate them.
 // See bugs: 4324348, 4854693, 4998314, 5040492, 5050705.
 class ThreadInVMfromJavaNoAsyncException : public ThreadStateTransition {
  public:
   ThreadInVMfromJavaNoAsyncException(JavaThread* thread) : ThreadStateTransition(thread) {
     trans_from_java(_thread_in_vm);
   }
   ~ThreadInVMfromJavaNoAsyncException()  {
     trans(_thread_in_vm, _thread_in_Java);
     // NOTE: We do not check for pending. async. exceptions.
     // If we did and moved the pending async exception over into the
     // pending exception field, we would need to deopt (currently C2
     // only). However, to do so would require that we transition back
     // to the _thread_in_vm state. Instead we postpone the handling of
     // the async exception.
     // Check for pending. suspends only.
     if (_thread->has_special_runtime_exit_condition())
       _thread->handle_special_runtime_exit_condition(false);
   }
 };
 // Debug class instantiated in JRT_ENTRY and ITR_ENTRY macro.
 // Can be used to verify properties on enter/exit of the VM.
 #ifdef ASSERT
 class VMEntryWrapper {
  public:
   VMEntryWrapper() {
     if (VerifyLastFrame) {
       InterfaceSupport::verify_last_frame();
     }
   }
   ~VMEntryWrapper() {
     InterfaceSupport::check_gc_alot();
     if (WalkStackALot) {
       InterfaceSupport::walk_stack();
     }
 #ifdef ENABLE_ZAP_DEAD_LOCALS
     if (ZapDeadLocalsOld) {
       InterfaceSupport::zap_dead_locals_old();
     }
 #endif
 #ifdef COMPILER2
     // This option is not used by Compiler 1
     if (StressDerivedPointers) {
       InterfaceSupport::stress_derived_pointers();
     }
 #endif
     if (DeoptimizeALot || DeoptimizeRandom) {
       InterfaceSupport::deoptimizeAll();
     }
     if (ZombieALot) {
       InterfaceSupport::zombieAll();
     }
     if (UnlinkSymbolsALot) {
       InterfaceSupport::unlinkSymbols();
     }
     // do verification AFTER potential deoptimization
     if (VerifyStack) {
       InterfaceSupport::verify_stack();
     }
   }
 };
 class VMNativeEntryWrapper {
  public:
   VMNativeEntryWrapper() {
     if (GCALotAtAllSafepoints) InterfaceSupport::check_gc_alot();
   }
   ~VMNativeEntryWrapper() {
     if (GCALotAtAllSafepoints) InterfaceSupport::check_gc_alot();
   }
 };
 #endif
 // VM-internal runtime interface support
 #ifdef ASSERT
 class RuntimeHistogramElement : public HistogramElement {
   public:
    RuntimeHistogramElement(const char* name);
 };
 #define TRACE_CALL(result_type, header)                            \
   InterfaceSupport::_number_of_calls++;                            \
   if (TraceRuntimeCalls)                                           \
     InterfaceSupport::trace(#result_type, #header);                \
   if (CountRuntimeCalls) {                                         \
     static RuntimeHistogramElement* e = new RuntimeHistogramElement(#header); \
     if (e != NULL) e->increment_count();                           \
   }
 #else
 #define TRACE_CALL(result_type, header)                            \
   /* do nothing */
 #endif
 // LEAF routines do not lock, GC or throw exceptions
 #define __LEAF(result_type, header)                                  \
   TRACE_CALL(result_type, header)                                    \
   debug_only(NoHandleMark __hm;)                                     \
   /* begin of body */
 // ENTRY routines may lock, GC and throw exceptions
 #define __ENTRY(result_type, header, thread)                         \
   TRACE_CALL(result_type, header)                                    \
   HandleMarkCleaner __hm(thread);                                    \
   Thread* THREAD = thread;                                           \
   /* begin of body */
 // QUICK_ENTRY routines behave like ENTRY but without a handle mark
 #define __QUICK_ENTRY(result_type, header, thread)                   \
   TRACE_CALL(result_type, header)                                    \
   debug_only(NoHandleMark __hm;)                                     \
   Thread* THREAD = thread;                                           \
   /* begin of body */
 // Definitions for IRT (Interpreter Runtime)
 // (thread is an argument passed in to all these routines)
 #define IRT_ENTRY(result_type, header)                               \
   result_type header {                                               \
     ThreadInVMfromJava __tiv(thread);                                \
     __ENTRY(result_type, header, thread)                             \
     debug_only(VMEntryWrapper __vew;)
 #define IRT_LEAF(result_type, header)                                \
   result_type header {                                               \
     __LEAF(result_type, header)                                      \
     debug_only(No_Safepoint_Verifier __nspv(true);)
 #define IRT_ENTRY_NO_ASYNC(result_type, header)                      \
   result_type header {                                               \
     ThreadInVMfromJavaNoAsyncException __tiv(thread);                \
     __ENTRY(result_type, header, thread)                             \
     debug_only(VMEntryWrapper __vew;)
 // Another special case for nmethod_entry_point so the nmethod that the
 // interpreter is about to branch to doesn't get flushed before as we
 // branch to it's interpreter_entry_point.  Skip stress testing here too.
 // Also we don't allow async exceptions because it is just too painful.
 #define IRT_ENTRY_FOR_NMETHOD(result_type, header)                   \
   result_type header {                                               \
     nmethodLocker _nmlock(nm);                                       \
     ThreadInVMfromJavaNoAsyncException __tiv(thread);                                \
     __ENTRY(result_type, header, thread)
 #define IRT_END }
 // Definitions for JRT (Java (Compiler/Shared) Runtime)
 #define JRT_ENTRY(result_type, header)                               \
   result_type header {                                               \
     ThreadInVMfromJava __tiv(thread);                                \
     __ENTRY(result_type, header, thread)                             \
     debug_only(VMEntryWrapper __vew;)
 #define JRT_LEAF(result_type, header)                                \
   result_type header {                                               \
   __LEAF(result_type, header)                                        \
   debug_only(JRT_Leaf_Verifier __jlv;)
 #define JRT_ENTRY_NO_ASYNC(result_type, header)                      \
   result_type header {                                               \
     ThreadInVMfromJavaNoAsyncException __tiv(thread);                \
     __ENTRY(result_type, header, thread)                             \
     debug_only(VMEntryWrapper __vew;)
 // Same as JRT Entry but allows for return value after the safepoint
 // to get back into Java from the VM
 #define JRT_BLOCK_ENTRY(result_type, header)                         \
   result_type header {                                               \
     TRACE_CALL(result_type, header)                                  \
     HandleMarkCleaner __hm(thread);
 #define JRT_BLOCK                                                    \
     {                                                                \
     ThreadInVMfromJava __tiv(thread);                                \
     Thread* THREAD = thread;                                         \
     debug_only(VMEntryWrapper __vew;)
 #define JRT_BLOCK_END }
 #define JRT_END }
 // Definitions for JNI
 #define JNI_ENTRY(result_type, header)                               \
     JNI_ENTRY_NO_PRESERVE(result_type, header)                       \
     WeakPreserveExceptionMark __wem(thread);
 #define JNI_ENTRY_NO_PRESERVE(result_type, header)             \
 extern "C" {                                                         \
   result_type JNICALL header {                                \
     JavaThread* thread=JavaThread::thread_from_jni_environment(env); \
     assert( !VerifyJNIEnvThread || (thread == Thread::current()), "JNIEnv is only valid in same thread"); \
     ThreadInVMfromNative __tiv(thread);                              \
     debug_only(VMNativeEntryWrapper __vew;)                          \
     __ENTRY(result_type, header, thread)
 // Ensure that the VMNativeEntryWrapper constructor, which can cause
 // a GC, is called outside the NoHandleMark (set via __QUICK_ENTRY).
 #define JNI_QUICK_ENTRY(result_type, header)                         \
 extern "C" {                                                         \
   result_type JNICALL header {                                \
     JavaThread* thread=JavaThread::thread_from_jni_environment(env); \
     assert( !VerifyJNIEnvThread || (thread == Thread::current()), "JNIEnv is only valid in same thread"); \
     ThreadInVMfromNative __tiv(thread);                              \
     debug_only(VMNativeEntryWrapper __vew;)                          \
     __QUICK_ENTRY(result_type, header, thread)
 #define JNI_LEAF(result_type, header)                                \
 extern "C" {                                                         \
   result_type JNICALL header {                                \
     JavaThread* thread=JavaThread::thread_from_jni_environment(env); \
     assert( !VerifyJNIEnvThread || (thread == Thread::current()), "JNIEnv is only valid in same thread"); \
     __LEAF(result_type, header)
 // Close the routine and the extern "C"
 #define JNI_END } }
 // Definitions for JVM
 #define JVM_ENTRY(result_type, header)                               \
 extern "C" {                                                         \
   result_type JNICALL header {                                       \
     JavaThread* thread=JavaThread::thread_from_jni_environment(env); \
     ThreadInVMfromNative __tiv(thread);                              \
     debug_only(VMNativeEntryWrapper __vew;)                          \
     __ENTRY(result_type, header, thread)
 #define JVM_ENTRY_NO_ENV(result_type, header)                        \
 extern "C" {                                                         \
   result_type JNICALL header {                                       \
     JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread();  \
     ThreadInVMfromNative __tiv(thread);                              \
     debug_only(VMNativeEntryWrapper __vew;)                          \
     __ENTRY(result_type, header, thread)
 #define JVM_QUICK_ENTRY(result_type, header)                         \
 extern "C" {                                                         \
   result_type JNICALL header {                                       \
     JavaThread* thread=JavaThread::thread_from_jni_environment(env); \
     ThreadInVMfromNative __tiv(thread);                              \
     debug_only(VMNativeEntryWrapper __vew;)                          \
     __QUICK_ENTRY(result_type, header, thread)
 #define JVM_LEAF(result_type, header)                                \
 extern "C" {                                                         \
   result_type JNICALL header {                                       \
     VM_Exit::block_if_vm_exited();                                   \
     __LEAF(result_type, header)
 #define JVM_END } }
 #endif // SHARE_VM_RUNTIME_INTERFACESUPPORT_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/interfaceSupport.hpp@3582bf76420e (annotated)

src/share/vm/runtime/interfaceSupport.hpp