1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/cpu/x86/vm/dump_x86_64.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,114 @@
1.4 +/*
1.5 + * Copyright 2004-2007 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +# include "incls/_precompiled.incl"
1.29 +# include "incls/_dump_x86_64.cpp.incl"
1.30 +
1.31 +
1.32 +
1.33 +// Generate the self-patching vtable method:
1.34 +//
1.35 +// This method will be called (as any other Klass virtual method) with
1.36 +// the Klass itself as the first argument. Example:
1.37 +//
1.38 +// oop obj;
1.39 +// int size = obj->klass()->klass_part()->oop_size(this);
1.40 +//
1.41 +// for which the virtual method call is Klass::oop_size();
1.42 +//
1.43 +// The dummy method is called with the Klass object as the first
1.44 +// operand, and an object as the second argument.
1.45 +//
1.46 +
1.47 +//=====================================================================
1.48 +
1.49 +// All of the dummy methods in the vtable are essentially identical,
1.50 +// differing only by an ordinal constant, and they bear no releationship
1.51 +// to the original method which the caller intended. Also, there needs
1.52 +// to be 'vtbl_list_size' instances of the vtable in order to
1.53 +// differentiate between the 'vtable_list_size' original Klass objects.
1.54 +
1.55 +#define __ masm->
1.56 +
1.57 +void CompactingPermGenGen::generate_vtable_methods(void** vtbl_list,
1.58 + void** vtable,
1.59 + char** md_top,
1.60 + char* md_end,
1.61 + char** mc_top,
1.62 + char* mc_end) {
1.63 +
1.64 + intptr_t vtable_bytes = (num_virtuals * vtbl_list_size) * sizeof(void*);
1.65 + *(intptr_t *)(*md_top) = vtable_bytes;
1.66 + *md_top += sizeof(intptr_t);
1.67 + void** dummy_vtable = (void**)*md_top;
1.68 + *vtable = dummy_vtable;
1.69 + *md_top += vtable_bytes;
1.70 +
1.71 + // Get ready to generate dummy methods.
1.72 +
1.73 + CodeBuffer cb((unsigned char*)*mc_top, mc_end - *mc_top);
1.74 + MacroAssembler* masm = new MacroAssembler(&cb);
1.75 +
1.76 + Label common_code;
1.77 + for (int i = 0; i < vtbl_list_size; ++i) {
1.78 + for (int j = 0; j < num_virtuals; ++j) {
1.79 + dummy_vtable[num_virtuals * i + j] = (void*)masm->pc();
1.80 +
1.81 + // Load eax with a value indicating vtable/offset pair.
1.82 + // -- bits[ 7..0] (8 bits) which virtual method in table?
1.83 + // -- bits[12..8] (5 bits) which virtual method table?
1.84 + // -- must fit in 13-bit instruction immediate field.
1.85 + __ movl(rax, (i << 8) + j);
1.86 + __ jmp(common_code);
1.87 + }
1.88 + }
1.89 +
1.90 + __ bind(common_code);
1.91 +
1.92 + // Expecting to be called with "thiscall" convections -- the arguments
1.93 + // are on the stack and the "this" pointer is in c_rarg0. In addition, rax
1.94 + // was set (above) to the offset of the method in the table.
1.95 +
1.96 + __ pushq(c_rarg1); // save & free register
1.97 + __ pushq(c_rarg0); // save "this"
1.98 + __ movq(c_rarg0, rax);
1.99 + __ shrq(c_rarg0, 8); // isolate vtable identifier.
1.100 + __ shlq(c_rarg0, LogBytesPerWord);
1.101 + __ lea(c_rarg1, ExternalAddress((address)vtbl_list)); // ptr to correct vtable list.
1.102 + __ addq(c_rarg1, c_rarg0); // ptr to list entry.
1.103 + __ movq(c_rarg1, Address(c_rarg1, 0)); // get correct vtable address.
1.104 + __ popq(c_rarg0); // restore "this"
1.105 + __ movq(Address(c_rarg0, 0), c_rarg1); // update vtable pointer.
1.106 +
1.107 + __ andq(rax, 0x00ff); // isolate vtable method index
1.108 + __ shlq(rax, LogBytesPerWord);
1.109 + __ addq(rax, c_rarg1); // address of real method pointer.
1.110 + __ popq(c_rarg1); // restore register.
1.111 + __ movq(rax, Address(rax, 0)); // get real method pointer.
1.112 + __ jmp(rax); // jump to the real method.
1.113 +
1.114 + __ flush();
1.115 +
1.116 + *mc_top = (char*)__ pc();
1.117 +}
