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view src/share/vm/runtime/javaCalls.hpp @ 3979:4dfb2df418f2
6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp
author | johnc |
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date | Thu, 22 Sep 2011 10:57:37 -0700 |
parents | 1d1603768966 |
children | 0654ee04b214 f08d439fab8c |
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/* * Copyright (c) 1997, 2011, 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_JAVACALLS_HPP #define SHARE_VM_RUNTIME_JAVACALLS_HPP #include "memory/allocation.hpp" #include "oops/methodOop.hpp" #include "runtime/handles.hpp" #include "runtime/javaFrameAnchor.hpp" #include "runtime/vmThread.hpp" #ifdef TARGET_ARCH_x86 # include "jniTypes_x86.hpp" #endif #ifdef TARGET_ARCH_sparc # include "jniTypes_sparc.hpp" #endif #ifdef TARGET_ARCH_zero # include "jniTypes_zero.hpp" #endif #ifdef TARGET_ARCH_arm # include "jniTypes_arm.hpp" #endif #ifdef TARGET_ARCH_ppc # include "jniTypes_ppc.hpp" #endif #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 // A JavaCallWrapper is constructed before each JavaCall and destructed after the call. // Its purpose is to allocate/deallocate a new handle block and to save/restore the last // Java fp/sp. A pointer to the JavaCallWrapper is stored on the stack. class JavaCallWrapper: StackObj { friend class VMStructs; private: JavaThread* _thread; // the thread to which this call belongs JNIHandleBlock* _handles; // the saved handle block methodOop _callee_method; // to be able to collect arguments if entry frame is top frame oop _receiver; // the receiver of the call (if a non-static call) JavaFrameAnchor _anchor; // last thread anchor state that we must restore JavaValue* _result; // result value public: // Construction/destruction JavaCallWrapper(methodHandle callee_method, Handle receiver, JavaValue* result, TRAPS); ~JavaCallWrapper(); // Accessors JavaThread* thread() const { return _thread; } JNIHandleBlock* handles() const { return _handles; } JavaFrameAnchor* anchor(void) { return &_anchor; } JavaValue* result() const { return _result; } // GC support methodOop callee_method() { return _callee_method; } oop receiver() { return _receiver; } void oops_do(OopClosure* f); }; // Encapsulates arguments to a JavaCall (faster, safer, and more convenient than using var-args) class JavaCallArguments : public StackObj { private: enum Constants { _default_size = 8 // Must be at least # of arguments in JavaCalls methods }; intptr_t _value_buffer [_default_size + 1]; bool _is_oop_buffer[_default_size + 1]; intptr_t* _value; bool* _is_oop; int _size; int _max_size; bool _start_at_zero; // Support late setting of receiver void initialize() { // Starts at first element to support set_receiver. _value = &_value_buffer[1]; _is_oop = &_is_oop_buffer[1]; _max_size = _default_size; _size = 0; _start_at_zero = false; } public: JavaCallArguments() { initialize(); } JavaCallArguments(Handle receiver) { initialize(); push_oop(receiver); } JavaCallArguments(int max_size) { if (max_size > _default_size) { _value = NEW_RESOURCE_ARRAY(intptr_t, max_size + 1); _is_oop = NEW_RESOURCE_ARRAY(bool, max_size + 1); // Reserve room for potential receiver in value and is_oop _value++; _is_oop++; _max_size = max_size; _size = 0; _start_at_zero = false; } else { initialize(); } } inline void push_oop(Handle h) { _is_oop[_size] = true; JNITypes::put_obj((oop)h.raw_value(), _value, _size); } inline void push_int(int i) { _is_oop[_size] = false; JNITypes::put_int(i, _value, _size); } inline void push_double(double d) { _is_oop[_size] = false; _is_oop[_size + 1] = false; JNITypes::put_double(d, _value, _size); } inline void push_long(jlong l) { _is_oop[_size] = false; _is_oop[_size + 1] = false; JNITypes::put_long(l, _value, _size); } inline void push_float(float f) { _is_oop[_size] = false; JNITypes::put_float(f, _value, _size); } // receiver Handle receiver() { assert(_size > 0, "must at least be one argument"); assert(_is_oop[0], "first argument must be an oop"); assert(_value[0] != 0, "receiver must be not-null"); return Handle((oop*)_value[0], false); } void set_receiver(Handle h) { assert(_start_at_zero == false, "can only be called once"); _start_at_zero = true; _is_oop--; _value--; _size++; _is_oop[0] = true; _value[0] = (intptr_t)h.raw_value(); } // Converts all Handles to oops, and returns a reference to parameter vector intptr_t* parameters() ; int size_of_parameters() const { return _size; } // Verify that pushed arguments fits a given method void verify(methodHandle method, BasicType return_type, Thread *thread); }; // All calls to Java have to go via JavaCalls. Sets up the stack frame // and makes sure that the last_Java_frame pointers are chained correctly. // class JavaCalls: AllStatic { static void call_helper(JavaValue* result, methodHandle* method, JavaCallArguments* args, TRAPS); public: // Optimized Constuctor call static void call_default_constructor(JavaThread* thread, methodHandle method, Handle receiver, TRAPS); // call_special // ------------ // The receiver must be first oop in argument list static void call_special(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS); static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS); // No args static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS); static void call_special(JavaValue* result, Handle receiver, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS); // virtual call // ------------ // The receiver must be first oop in argument list static void call_virtual(JavaValue* result, KlassHandle spec_klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS); static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, TRAPS); // No args static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS); static void call_virtual(JavaValue* result, Handle receiver, KlassHandle spec_klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS); // Static call // ----------- static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, JavaCallArguments* args, TRAPS); static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS); static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, TRAPS); static void call_static(JavaValue* result, KlassHandle klass, Symbol* name, Symbol* signature, Handle arg1, Handle arg2, TRAPS); // Low-level interface static void call(JavaValue* result, methodHandle method, JavaCallArguments* args, TRAPS); }; #endif // SHARE_VM_RUNTIME_JAVACALLS_HPP