annotate src/cpu/sparc/vm/dump_sparc.cpp @ 0:a61af66fc99e

Initial load
author duke
date Sat, 01 Dec 2007 00:00:00 +0000
parents
children 6b2273dd6fa9
rev   line source
duke@0 1 /*
duke@0 2 * Copyright 2004-2007 Sun Microsystems, Inc. All Rights Reserved.
duke@0 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@0 4 *
duke@0 5 * This code is free software; you can redistribute it and/or modify it
duke@0 6 * under the terms of the GNU General Public License version 2 only, as
duke@0 7 * published by the Free Software Foundation.
duke@0 8 *
duke@0 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@0 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@0 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@0 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@0 13 * accompanied this code).
duke@0 14 *
duke@0 15 * You should have received a copy of the GNU General Public License version
duke@0 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@0 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@0 18 *
duke@0 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@0 20 * CA 95054 USA or visit www.sun.com if you need additional information or
duke@0 21 * have any questions.
duke@0 22 *
duke@0 23 */
duke@0 24
duke@0 25 # include "incls/_precompiled.incl"
duke@0 26 # include "incls/_dump_sparc.cpp.incl"
duke@0 27
duke@0 28
duke@0 29
duke@0 30 // Generate the self-patching vtable method:
duke@0 31 //
duke@0 32 // This method will be called (as any other Klass virtual method) with
duke@0 33 // the Klass itself as the first argument. Example:
duke@0 34 //
duke@0 35 // oop obj;
duke@0 36 // int size = obj->klass()->klass_part()->oop_size(this);
duke@0 37 //
duke@0 38 // for which the virtual method call is Klass::oop_size();
duke@0 39 //
duke@0 40 // The dummy method is called with the Klass object as the first
duke@0 41 // operand, and an object as the second argument.
duke@0 42 //
duke@0 43
duke@0 44 //=====================================================================
duke@0 45
duke@0 46 // All of the dummy methods in the vtable are essentially identical,
duke@0 47 // differing only by an ordinal constant, and they bear no releationship
duke@0 48 // to the original method which the caller intended. Also, there needs
duke@0 49 // to be 'vtbl_list_size' instances of the vtable in order to
duke@0 50 // differentiate between the 'vtable_list_size' original Klass objects.
duke@0 51
duke@0 52 #define __ masm->
duke@0 53
duke@0 54 void CompactingPermGenGen::generate_vtable_methods(void** vtbl_list,
duke@0 55 void** vtable,
duke@0 56 char** md_top,
duke@0 57 char* md_end,
duke@0 58 char** mc_top,
duke@0 59 char* mc_end) {
duke@0 60
duke@0 61 intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);
duke@0 62 *(intptr_t *)(*md_top) = vtable_bytes;
duke@0 63 *md_top += sizeof(intptr_t);
duke@0 64 void** dummy_vtable = (void**)*md_top;
duke@0 65 *vtable = dummy_vtable;
duke@0 66 *md_top += vtable_bytes;
duke@0 67
duke@0 68 guarantee(*md_top <= md_end, "Insufficient space for vtables.");
duke@0 69
duke@0 70 // Get ready to generate dummy methods.
duke@0 71
duke@0 72 CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
duke@0 73 MacroAssembler* masm = new MacroAssembler(&cb);
duke@0 74
duke@0 75 Label common_code;
duke@0 76 for (int i = 0; i < vtbl_list_size; ++i) {
duke@0 77 for (int j = 0; j < num_virtuals; ++j) {
duke@0 78 dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();
duke@0 79 __ save(SP, -256, SP);
duke@0 80 __ brx(Assembler::always, false, Assembler::pt, common_code);
duke@0 81
duke@0 82 // Load L0 with a value indicating vtable/offset pair.
duke@0 83 // -- bits[ 7..0] (8 bits) which virtual method in table?
duke@0 84 // -- bits[12..8] (5 bits) which virtual method table?
duke@0 85 // -- must fit in 13-bit instruction immediate field.
duke@0 86 __ delayed()->set((i << 8) + j, L0);
duke@0 87 }
duke@0 88 }
duke@0 89
duke@0 90 __ bind(common_code);
duke@0 91
duke@0 92 // Expecting to be called with the "this" pointer in O0/I0 (where
duke@0 93 // "this" is a Klass object). In addition, L0 was set (above) to
duke@0 94 // identify the method and table.
duke@0 95
duke@0 96 // Look up the correct vtable pointer.
duke@0 97
duke@0 98 __ set((intptr_t)vtbl_list, L2); // L2 = address of new vtable list.
duke@0 99 __ srl(L0, 8, L3); // Isolate L3 = vtable identifier.
duke@0 100 __ sll(L3, LogBytesPerWord, L3);
duke@0 101 __ ld_ptr(L2, L3, L3); // L3 = new (correct) vtable pointer.
duke@0 102 __ st_ptr(L3, Address(I0, 0)); // Save correct vtable ptr in entry.
duke@0 103
duke@0 104 // Restore registers and jump to the correct method;
duke@0 105
duke@0 106 __ and3(L0, 255, L4); // Isolate L3 = method offset;.
duke@0 107 __ sll(L4, LogBytesPerWord, L4);
duke@0 108 __ ld_ptr(L3, L4, L4); // Get address of correct virtual method
duke@0 109 Address method(L4, 0);
duke@0 110 __ jmpl(method, G0); // Jump to correct method.
duke@0 111 __ delayed()->restore(); // Restore registers.
duke@0 112
duke@0 113 __ flush();
duke@0 114 *mc_top = (char*)__ pc();
duke@0 115
duke@0 116 guarantee(*mc_top <= mc_end, "Insufficient space for method wrappers.");
duke@0 117 }