--- a/src/hotspot/share/runtime/interfaceSupport.hpp Fri Mar 16 08:26:53 2018 -0400
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,623 +0,0 @@
-/*
- * Copyright (c) 1997, 2017, 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 "gc/shared/gcLocker.hpp"
-#include "runtime/handles.inline.hpp"
-#include "runtime/mutexLocker.hpp"
-#include "runtime/orderAccess.hpp"
-#include "runtime/os.hpp"
-#include "runtime/safepointMechanism.inline.hpp"
-#include "runtime/thread.inline.hpp"
-#include "runtime/vmThread.hpp"
-#include "utilities/globalDefinitions.hpp"
-#include "utilities/macros.hpp"
-#include "utilities/preserveException.hpp"
-
-// 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) throw() {
- return ptr;
- }
-};
-
-// InterfaceSupport provides functionality used by the VM_LEAF_BASE and
-// VM_ENTRY_BASE 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;
-
- // 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();
-
- 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:
- static void serialize_thread_state_with_handler(JavaThread* thread) {
- serialize_thread_state_internal(thread, true);
- }
-
- // Should only call this if we know that we have a proper SEH set up.
- static void serialize_thread_state(JavaThread* thread) {
- serialize_thread_state_internal(thread, false);
- }
-
- private:
- static void serialize_thread_state_internal(JavaThread* thread, bool needs_exception_handler) {
- // 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
- if (needs_exception_handler) {
- os::write_memory_serialize_page_with_handler(thread);
- } else {
- os::write_memory_serialize_page(thread);
- }
- }
- }
- }
-};
-
-
-// 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
- thread->set_thread_state((JavaThreadState)(from + 1));
-
- InterfaceSupport::serialize_thread_state(thread);
-
- SafepointMechanism::block_if_requested(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
- thread->set_thread_state((JavaThreadState)(from + 1));
-
- InterfaceSupport::serialize_thread_state_with_handler(thread);
-
- SafepointMechanism::block_if_requested(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
- thread->set_thread_state(_thread_in_native_trans);
-
- InterfaceSupport::serialize_thread_state_with_handler(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 (SafepointMechanism::poll(thread) || 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 ThreadInVMForHandshake : public ThreadStateTransition {
- const JavaThreadState _original_state;
-
- void transition_back() {
- // This can be invoked from transition states and must return to the original state properly
- assert(_thread->thread_state() == _thread_in_vm, "should only call when leaving VM after handshake");
- _thread->set_thread_state(_thread_in_vm_trans);
-
- InterfaceSupport::serialize_thread_state(_thread);
-
- SafepointMechanism::block_if_requested(_thread);
-
- _thread->set_thread_state(_original_state);
- }
-
- public:
-
- ThreadInVMForHandshake(JavaThread* thread) : ThreadStateTransition(thread),
- _original_state(thread->thread_state()) {
-
- if (thread->has_last_Java_frame()) {
- thread->frame_anchor()->make_walkable(thread);
- }
-
- thread->set_thread_state(_thread_in_vm);
- }
-
- ~ThreadInVMForHandshake() {
- transition_back();
- }
-
-};
-
-class ThreadInVMfromJava : public ThreadStateTransition {
- public:
- ThreadInVMfromJava(JavaThread* thread) : ThreadStateTransition(thread) {
- trans_from_java(_thread_in_vm);
- }
- ~ThreadInVMfromJava() {
- if (_thread->stack_yellow_reserved_zone_disabled()) {
- _thread->enable_stack_yellow_reserved_zone();
- }
- 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);
- assert(!_thread->is_pending_jni_exception_check(), "Pending JNI Exception Check");
- // 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() {
- if (_thread->stack_yellow_reserved_zone_disabled()) {
- _thread->enable_stack_yellow_reserved_zone();
- }
- 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 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 (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 VM_LEAF_BASE(result_type, header) \
- TRACE_CALL(result_type, header) \
- debug_only(NoHandleMark __hm;) \
- os::verify_stack_alignment(); \
- /* begin of body */
-
-#define VM_ENTRY_BASE_FROM_LEAF(result_type, header, thread) \
- TRACE_CALL(result_type, header) \
- debug_only(ResetNoHandleMark __rnhm;) \
- HandleMarkCleaner __hm(thread); \
- Thread* THREAD = thread; \
- os::verify_stack_alignment(); \
- /* begin of body */
-
-
-// ENTRY routines may lock, GC and throw exceptions
-
-#define VM_ENTRY_BASE(result_type, header, thread) \
- TRACE_CALL(result_type, header) \
- HandleMarkCleaner __hm(thread); \
- Thread* THREAD = thread; \
- os::verify_stack_alignment(); \
- /* begin of body */
-
-
-// QUICK_ENTRY routines behave like ENTRY but without a handle mark
-
-#define VM_QUICK_ENTRY_BASE(result_type, header, thread) \
- TRACE_CALL(result_type, header) \
- debug_only(NoHandleMark __hm;) \
- Thread* THREAD = thread; \
- os::verify_stack_alignment(); \
- /* 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); \
- VM_ENTRY_BASE(result_type, header, thread) \
- debug_only(VMEntryWrapper __vew;)
-
-
-#define IRT_LEAF(result_type, header) \
- result_type header { \
- VM_LEAF_BASE(result_type, header) \
- debug_only(NoSafepointVerifier __nspv(true);)
-
-
-#define IRT_ENTRY_NO_ASYNC(result_type, header) \
- result_type header { \
- ThreadInVMfromJavaNoAsyncException __tiv(thread); \
- VM_ENTRY_BASE(result_type, header, thread) \
- debug_only(VMEntryWrapper __vew;)
-
-#define IRT_END }
-
-
-// Definitions for JRT (Java (Compiler/Shared) Runtime)
-
-#define JRT_ENTRY(result_type, header) \
- result_type header { \
- ThreadInVMfromJava __tiv(thread); \
- VM_ENTRY_BASE(result_type, header, thread) \
- debug_only(VMEntryWrapper __vew;)
-
-
-#define JRT_LEAF(result_type, header) \
- result_type header { \
- VM_LEAF_BASE(result_type, header) \
- debug_only(JRTLeafVerifier __jlv;)
-
-
-#define JRT_ENTRY_NO_ASYNC(result_type, header) \
- result_type header { \
- ThreadInVMfromJavaNoAsyncException __tiv(thread); \
- VM_ENTRY_BASE(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_NO_ASYNC \
- { \
- ThreadInVMfromJavaNoAsyncException __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;) \
- VM_ENTRY_BASE(result_type, header, thread)
-
-
-// Ensure that the VMNativeEntryWrapper constructor, which can cause
-// a GC, is called outside the NoHandleMark (set via VM_QUICK_ENTRY_BASE).
-#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;) \
- VM_QUICK_ENTRY_BASE(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"); \
- VM_LEAF_BASE(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;) \
- VM_ENTRY_BASE(result_type, header, thread)
-
-
-#define JVM_ENTRY_NO_ENV(result_type, header) \
-extern "C" { \
- result_type JNICALL header { \
- JavaThread* thread = JavaThread::current(); \
- ThreadInVMfromNative __tiv(thread); \
- debug_only(VMNativeEntryWrapper __vew;) \
- VM_ENTRY_BASE(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;) \
- VM_QUICK_ENTRY_BASE(result_type, header, thread)
-
-
-#define JVM_LEAF(result_type, header) \
-extern "C" { \
- result_type JNICALL header { \
- VM_Exit::block_if_vm_exited(); \
- VM_LEAF_BASE(result_type, header)
-
-
-#define JVM_ENTRY_FROM_LEAF(env, result_type, header) \
- { { \
- JavaThread* thread=JavaThread::thread_from_jni_environment(env); \
- ThreadInVMfromNative __tiv(thread); \
- debug_only(VMNativeEntryWrapper __vew;) \
- VM_ENTRY_BASE_FROM_LEAF(result_type, header, thread)
-
-
-#define JVM_END } }
-
-#endif // SHARE_VM_RUNTIME_INTERFACESUPPORT_HPP