jdk8-mips64-public/hotspot: src/share/vm/runtime/javaCalls.hpp@32bc598624bd (annotated)

src/share/vm/runtime/javaCalls.hpp@32bc598624bd (annotated)

src/share/vm/runtime/javaCalls.hpp

Tue, 07 May 2019 20:38:26 +0000

author: phh
date: Tue, 07 May 2019 20:38:26 +0000
changeset 9669: 32bc598624bd
parent 6198: 55fb97c4c58d
child 9703: 2fdf635bcf28
permissions: -rw-r--r--

8176100: [REDO][REDO] G1 Needs pre barrier on dereference of weak JNI handles
Summary: Add tag bit to all JNI weak handles
Reviewed-by: kbarrett, coleenp, tschatzl

 /*
  * 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_JAVACALLS_HPP
 #define SHARE_VM_RUNTIME_JAVACALLS_HPP
 #include "memory/allocation.hpp"
 #include "oops/method.hpp"
 #include "runtime/handles.hpp"
 #include "runtime/javaFrameAnchor.hpp"
 #include "runtime/thread.inline.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
 // 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
   Method*          _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
   Method*          callee_method()          { return _callee_method; }
   oop              receiver()               { return _receiver; }
   void             oops_do(OopClosure* f);
   bool             is_first_frame() const   { return _anchor.last_Java_sp() == NULL; }
 };
 // 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];
   u_char      _value_state_buffer[_default_size + 1];
   intptr_t*   _value;
   u_char*     _value_state;
   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];
     _value_state = &_value_state_buffer[1];
     _max_size = _default_size;
     _size = 0;
     _start_at_zero = false;
   }
   // Helper for push_oop and the like.  The value argument is a
   // "handle" that refers to an oop.  We record the address of the
   // handle rather than the designated oop.  The handle is later
   // resolved to the oop by parameters().  This delays the exposure of
   // naked oops until it is GC-safe.
   template<typename T>
   inline int push_oop_impl(T handle, int size) {
     // JNITypes::put_obj expects an oop value, so we play fast and
     // loose with the type system.  The cast from handle type to oop
     // *must* use a C-style cast.  In a product build it performs a
     // reinterpret_cast. In a debug build (more accurately, in a
     // CHECK_UNHANDLED_OOPS build) it performs a static_cast, invoking
     // the debug-only oop class's conversion from void* constructor.
     JNITypes::put_obj((oop)handle, _value, size); // Updates size.
     return size;                // Return the updated size.
   }
  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);
       _value_state = NEW_RESOURCE_ARRAY(u_char, max_size + 1);
       // Reserve room for potential receiver in value and state
       _value++;
       _value_state++;
       _max_size = max_size;
       _size = 0;
       _start_at_zero = false;
     } else {
       initialize();
     }
   }
   // The possible values for _value_state elements.
   enum {
     value_state_primitive,
     value_state_oop,
     value_state_handle,
     value_state_jobject,
     value_state_limit
   };
   inline void push_oop(Handle h) {
     _value_state[_size] = value_state_handle;
     _size = push_oop_impl(h.raw_value(), _size);
   }
   inline void push_jobject(jobject h) {
     _value_state[_size] = value_state_jobject;
     _size = push_oop_impl(h, _size);
   }
   inline void push_int(int i) {
     _value_state[_size] = value_state_primitive;
     JNITypes::put_int(i, _value, _size);
   }
   inline void push_double(double d) {
     _value_state[_size] = value_state_primitive;
     _value_state[_size + 1] = value_state_primitive;
     JNITypes::put_double(d, _value, _size);
   }
   inline void push_long(jlong l) {
     _value_state[_size] = value_state_primitive;
     _value_state[_size + 1] = value_state_primitive;
     JNITypes::put_long(l, _value, _size);
   }
   inline void push_float(float f) {
     _value_state[_size] = value_state_primitive;
     JNITypes::put_float(f, _value, _size);
   }
   // receiver
   Handle receiver() {
     assert(_size > 0, "must at least be one argument");
     assert(_value_state[0] == value_state_handle,
            "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;
     _value_state--;
     _value--;
     _size++;
     _value_state[0] = value_state_handle;
     push_oop_impl(h.raw_value(), 0);
   }
   // 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);
 };
 // 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

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/javaCalls.hpp@32bc598624bd (annotated)

src/share/vm/runtime/javaCalls.hpp