--- old/src/cpu/x86/vm/metaspaceShared_x86_64.cpp 2017-02-28 17:55:19.756352731 -0800 +++ /dev/null 2016-10-11 18:49:32.781206965 -0700 @@ -1,114 +0,0 @@ -/* - * Copyright (c) 2004, 2012, 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. - * - */ - -#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()->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 relationship -// 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. - __ movl(rax, (i << 8) + j); - __ jmp(common_code); - } - } - - __ bind(common_code); - - // Expecting to be called with "thiscall" convections -- the arguments - // are on the stack and the "this" pointer is in c_rarg0. In addition, rax - // was set (above) to the offset of the method in the table. - - __ push(c_rarg1); // save & free register - __ push(c_rarg0); // save "this" - __ mov(c_rarg0, rax); - __ shrptr(c_rarg0, 8); // isolate vtable identifier. - __ shlptr(c_rarg0, LogBytesPerWord); - __ lea(c_rarg1, ExternalAddress((address)vtbl_list)); // ptr to correct vtable list. - __ addptr(c_rarg1, c_rarg0); // ptr to list entry. - __ movptr(c_rarg1, Address(c_rarg1, 0)); // get correct vtable address. - __ pop(c_rarg0); // restore "this" - __ movptr(Address(c_rarg0, 0), c_rarg1); // update vtable pointer. - - __ andptr(rax, 0x00ff); // isolate vtable method index - __ shlptr(rax, LogBytesPerWord); - __ addptr(rax, c_rarg1); // address of real method pointer. - __ pop(c_rarg1); // restore register. - __ movptr(rax, Address(rax, 0)); // get real method pointer. - __ jmp(rax); // jump to the real method. - - __ flush(); - - *mc_top = (char*)__ pc(); -}