1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/cpu/mips/vm/metaspaceShared_mips_64.cpp Fri Apr 29 00:06:10 2016 +0800
1.3 @@ -0,0 +1,107 @@
1.4 +/*
1.5 + * Copyright (c) 2004, 2012, Oracle and/or its affiliates. All rights reserved.
1.6 + * Copyright (c) 2015, 2016, Loongson Technology. All rights reserved.
1.7 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.8 + *
1.9 + * This code is free software; you can redistribute it and/or modify it
1.10 + * under the terms of the GNU General Public License version 2 only, as
1.11 + * published by the Free Software Foundation.
1.12 + *
1.13 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.14 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.15 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.16 + * version 2 for more details (a copy is included in the LICENSE file that
1.17 + * accompanied this code).
1.18 + *
1.19 + * You should have received a copy of the GNU General Public License version
1.20 + * 2 along with this work; if not, write to the Free Software Foundation,
1.21 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.22 + *
1.23 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.24 + * or visit www.oracle.com if you need additional information or have any
1.25 + * questions.
1.26 + *
1.27 + */
1.28 +
1.29 +#include "precompiled.hpp"
1.30 +#include "asm/macroAssembler.hpp"
1.31 +#include "asm/codeBuffer.hpp"
1.32 +#include "memory/metaspaceShared.hpp"
1.33 +
1.34 +// Generate the self-patching vtable method:
1.35 +//
1.36 +// This method will be called (as any other Klass virtual method) with
1.37 +// the Klass itself as the first argument. Example:
1.38 +//
1.39 +// oop obj;
1.40 +// int size = obj->klass()->klass_part()->oop_size(this);
1.41 +//
1.42 +// for which the virtual method call is Klass::oop_size();
1.43 +//
1.44 +// The dummy method is called with the Klass object as the first
1.45 +// operand, and an object as the second argument.
1.46 +//
1.47 +
1.48 +//=====================================================================
1.49 +
1.50 +// All of the dummy methods in the vtable are essentially identical,
1.51 +// differing only by an ordinal constant, and they bear no releationship
1.52 +// to the original method which the caller intended. Also, there needs
1.53 +// to be 'vtbl_list_size' instances of the vtable in order to
1.54 +// differentiate between the 'vtable_list_size' original Klass objects.
1.55 +
1.56 +#define __ masm->
1.57 +
1.58 +void MetaspaceShared::generate_vtable_methods(void** vtbl_list,
1.59 + void** vtable,
1.60 + char** md_top,
1.61 + char* md_end,
1.62 + char** mc_top,
1.63 + char* mc_end) {
1.64 +
1.65 + intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);
1.66 + *(intptr_t *)(*md_top) = vtable_bytes;
1.67 + *md_top += sizeof(intptr_t);
1.68 + void** dummy_vtable = (void**)*md_top;
1.69 + *vtable = dummy_vtable;
1.70 + *md_top += vtable_bytes;
1.71 +
1.72 + // Get ready to generate dummy methods.
1.73 +
1.74 + CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
1.75 + MacroAssembler* masm = new MacroAssembler(&cb);
1.76 +
1.77 + Label common_code;
1.78 + for (int i = 0; i < vtbl_list_size; ++i) {
1.79 + for (int j = 0; j < num_virtuals; ++j) {
1.80 + dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();
1.81 +
1.82 + // Load eax with a value indicating vtable/offset pair.
1.83 + // -- bits[ 7..0] (8 bits) which virtual method in table?
1.84 + // -- bits[12..8] (5 bits) which virtual method table?
1.85 + // -- must fit in 13-bit instruction immediate field.
1.86 + __ move(V0, (i << 8) + j);
1.87 + __ b(common_code);
1.88 + __ delayed()->nop();
1.89 + }
1.90 + }
1.91 +
1.92 + __ bind(common_code);
1.93 +
1.94 + __ srl(T9, V0, 8); // isolate vtable identifier.
1.95 + __ shl(T9, LogBytesPerWord);
1.96 + __ li(AT, (long)vtbl_list);
1.97 + __ add(T9, AT, T9);
1.98 + __ lw(T9, T9, 0); // get correct vtable address.
1.99 + __ sw(T9, A0, 0); // update vtable pointer.
1.100 +
1.101 + __ andi(V0, V0, 0x00ff); // isolate vtable method index
1.102 + __ shl(V0, LogBytesPerWord);
1.103 + __ add(T9, T9, V0); // address of real method pointer.
1.104 + __ jr(T9); // get real method pointer.
1.105 + __ delayed()->nop();
1.106 +
1.107 + __ flush();
1.108 +
1.109 + *mc_top = (char*)__ pc();
1.110 +}
