jdk8-mips64-public/hotspot: src/cpu/mips/vm/metaspaceShared_mips

src/cpu/mips/vm/metaspaceShared_mips_64.cpp@3cedde979d75 (annotated)

src/cpu/mips/vm/metaspaceShared_mips_64.cpp

Tue, 31 May 2016 00:22:06 -0400

author: aoqi
date: Tue, 31 May 2016 00:22:06 -0400
changeset 16: 3cedde979d75
parent 1: 2d8a650513c2
child 6880: 52ea28d233d2
permissions: -rw-r--r--

[Code Reorganization] load_two_bytes_from_at_bcp -> get_2_byte_integer_at_bcp
remove useless MacroAssembler::store_two_byts_to_at_bcp
change MacroAssembler::load_two_bytes_from_at_bcp to InterpreterMacroAssembler::get_2_byte_integer_at_bcp
change MacroAssembler::get_4_byte_integer_at_bcp to InterpreterMacroAssembler::get_4_byte_integer_at_bcp

 /*
  * Copyright (c) 2004, 2012, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2015, 2016, Loongson Technology. 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.
  *
  */
 #include "precompiled.hpp"
 #include "asm/macroAssembler.hpp"
 #include "asm/codeBuffer.hpp"
 #include "memory/metaspaceShared.hpp"
 // Generate the self-patching vtable method:
 //
 // This method will be called (as any other Klass virtual method) with
 // the Klass itself as the first argument.  Example:
 //
 //      oop obj;
 //      int size = obj->klass()->klass_part()->oop_size(this);
 //
 // for which the virtual method call is Klass::oop_size();
 //
 // The dummy method is called with the Klass object as the first
 // operand, and an object as the second argument.
 //
 //=====================================================================
 // All of the dummy methods in the vtable are essentially identical,
 // differing only by an ordinal constant, and they bear no releationship
 // to the original method which the caller intended. Also, there needs
 // to be 'vtbl_list_size' instances of the vtable in order to
 // differentiate between the 'vtable_list_size' original Klass objects.
 #define __ masm->
 void MetaspaceShared::generate_vtable_methods(void** vtbl_list,
                                                    void** vtable,
                                                    char** md_top,
                                                    char* md_end,
                                                    char** mc_top,
                                                    char* mc_end) {
   intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);
   *(intptr_t *)(*md_top) = vtable_bytes;
   *md_top += sizeof(intptr_t);
   void** dummy_vtable = (void**)*md_top;
   *vtable = dummy_vtable;
   *md_top += vtable_bytes;
   // Get ready to generate dummy methods.
   CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
   MacroAssembler* masm = new MacroAssembler(&cb);
   Label common_code;
   for (int i = 0; i < vtbl_list_size; ++i) {
     for (int j = 0; j < num_virtuals; ++j) {
       dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();
       // Load eax with a value indicating vtable/offset pair.
       // -- bits[ 7..0]  (8 bits) which virtual method in table?
       // -- bits[12..8]  (5 bits) which virtual method table?
       // -- must fit in 13-bit instruction immediate field.
       __ move(V0, (i << 8) + j);
       __ b(common_code);
       __ delayed()->nop();
     }
   }
   __ bind(common_code);
   __ srl(T9, V0, 8);		// isolate vtable identifier.
   __ shl(T9, LogBytesPerWord);
   __ li(AT, (long)vtbl_list);
   __ add(T9, AT, T9);
   __ lw(T9, T9, 0); 		// get correct vtable address.
   __ sw(T9, A0, 0);		// update vtable pointer.
   __ andi(V0, V0, 0x00ff);	// isolate vtable method index
   __ shl(V0, LogBytesPerWord);
   __ add(T9, T9, V0);		// address of real method pointer.
   __ jr(T9);			// get real method pointer.
   __ delayed()->nop();
   __ flush();
   *mc_top = (char*)__ pc();
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/mips/vm/metaspaceShared_mips_64.cpp@3cedde979d75 (annotated)

src/cpu/mips/vm/metaspaceShared_mips_64.cpp