1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/cpu/x86/vm/vtableStubs_x86_32.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,216 @@
1.4 +/*
1.5 + * Copyright 1997-2006 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/_vtableStubs_x86_32.cpp.incl"
1.30 +
1.31 +// machine-dependent part of VtableStubs: create VtableStub of correct size and
1.32 +// initialize its code
1.33 +
1.34 +#define __ masm->
1.35 +
1.36 +#ifndef PRODUCT
1.37 +extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index);
1.38 +#endif
1.39 +
1.40 +// used by compiler only; may use only caller saved registers rax, rbx, rcx.
1.41 +// rdx holds first int arg, rsi, rdi, rbp are callee-save & must be preserved.
1.42 +// Leave receiver in rcx; required behavior when +OptoArgsInRegisters
1.43 +// is modifed to put first oop in rcx.
1.44 +//
1.45 +VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
1.46 + const int i486_code_length = VtableStub::pd_code_size_limit(true);
1.47 + VtableStub* s = new(i486_code_length) VtableStub(true, vtable_index);
1.48 + ResourceMark rm;
1.49 + CodeBuffer cb(s->entry_point(), i486_code_length);
1.50 + MacroAssembler* masm = new MacroAssembler(&cb);
1.51 +
1.52 +#ifndef PRODUCT
1.53 +
1.54 + if (CountCompiledCalls) {
1.55 + __ increment(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
1.56 + }
1.57 +#endif /* PRODUCT */
1.58 +
1.59 + // get receiver (need to skip return address on top of stack)
1.60 + assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
1.61 +
1.62 + // get receiver klass
1.63 + address npe_addr = __ pc();
1.64 + __ movl(rax, Address(rcx, oopDesc::klass_offset_in_bytes()));
1.65 + // compute entry offset (in words)
1.66 + int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();
1.67 +#ifndef PRODUCT
1.68 + if (DebugVtables) {
1.69 + Label L;
1.70 + // check offset vs vtable length
1.71 + __ cmpl(Address(rax, instanceKlass::vtable_length_offset()*wordSize), vtable_index*vtableEntry::size());
1.72 + __ jcc(Assembler::greater, L);
1.73 + __ movl(rbx, vtable_index);
1.74 + __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), rcx, rbx);
1.75 + __ bind(L);
1.76 + }
1.77 +#endif // PRODUCT
1.78 +
1.79 + const Register method = rbx;
1.80 +
1.81 + // load methodOop and target address
1.82 + __ movl(method, Address(rax, entry_offset*wordSize + vtableEntry::method_offset_in_bytes()));
1.83 + if (DebugVtables) {
1.84 + Label L;
1.85 + __ cmpl(method, NULL_WORD);
1.86 + __ jcc(Assembler::equal, L);
1.87 + __ cmpl(Address(method, methodOopDesc::from_compiled_offset()), NULL_WORD);
1.88 + __ jcc(Assembler::notZero, L);
1.89 + __ stop("Vtable entry is NULL");
1.90 + __ bind(L);
1.91 + }
1.92 +
1.93 + // rax,: receiver klass
1.94 + // method (rbx): methodOop
1.95 + // rcx: receiver
1.96 + address ame_addr = __ pc();
1.97 + __ jmp( Address(method, methodOopDesc::from_compiled_offset()));
1.98 +
1.99 + masm->flush();
1.100 + s->set_exception_points(npe_addr, ame_addr);
1.101 + return s;
1.102 +}
1.103 +
1.104 +
1.105 +VtableStub* VtableStubs::create_itable_stub(int vtable_index) {
1.106 + // Note well: pd_code_size_limit is the absolute minimum we can get away with. If you
1.107 + // add code here, bump the code stub size returned by pd_code_size_limit!
1.108 + const int i486_code_length = VtableStub::pd_code_size_limit(false);
1.109 + VtableStub* s = new(i486_code_length) VtableStub(false, vtable_index);
1.110 + ResourceMark rm;
1.111 + CodeBuffer cb(s->entry_point(), i486_code_length);
1.112 + MacroAssembler* masm = new MacroAssembler(&cb);
1.113 +
1.114 + // Entry arguments:
1.115 + // rax,: Interface
1.116 + // rcx: Receiver
1.117 +
1.118 +#ifndef PRODUCT
1.119 + if (CountCompiledCalls) {
1.120 + __ increment(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
1.121 + }
1.122 +#endif /* PRODUCT */
1.123 + // get receiver (need to skip return address on top of stack)
1.124 +
1.125 + assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
1.126 +
1.127 + // get receiver klass (also an implicit null-check)
1.128 + address npe_addr = __ pc();
1.129 + __ movl(rbx, Address(rcx, oopDesc::klass_offset_in_bytes()));
1.130 +
1.131 + __ movl(rsi, rbx); // Save klass in free register
1.132 + // Most registers are in use, so save a few
1.133 + __ pushl(rdx);
1.134 + // compute itable entry offset (in words)
1.135 + const int base = instanceKlass::vtable_start_offset() * wordSize;
1.136 + assert(vtableEntry::size() * wordSize == 4, "adjust the scaling in the code below");
1.137 + __ movl(rdx, Address(rbx, instanceKlass::vtable_length_offset() * wordSize)); // Get length of vtable
1.138 + __ leal(rbx, Address(rbx, rdx, Address::times_4, base));
1.139 + if (HeapWordsPerLong > 1) {
1.140 + // Round up to align_object_offset boundary
1.141 + __ round_to(rbx, BytesPerLong);
1.142 + }
1.143 +
1.144 + Label hit, next, entry;
1.145 +
1.146 + __ jmp(entry);
1.147 +
1.148 + __ bind(next);
1.149 + __ addl(rbx, itableOffsetEntry::size() * wordSize);
1.150 +
1.151 + __ bind(entry);
1.152 +
1.153 +#ifdef ASSERT
1.154 + // Check that the entry is non-null
1.155 + if (DebugVtables) {
1.156 + Label L;
1.157 + __ pushl(rbx);
1.158 + __ movl(rbx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
1.159 + __ testl(rbx, rbx);
1.160 + __ jcc(Assembler::notZero, L);
1.161 + __ stop("null entry point found in itable's offset table");
1.162 + __ bind(L);
1.163 + __ popl(rbx);
1.164 + }
1.165 +#endif
1.166 + __ cmpl(rax, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
1.167 + __ jcc(Assembler::notEqual, next);
1.168 +
1.169 + // We found a hit, move offset into rbx,
1.170 + __ movl(rdx, Address(rbx, itableOffsetEntry::offset_offset_in_bytes()));
1.171 +
1.172 + // Compute itableMethodEntry.
1.173 + const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + itableMethodEntry::method_offset_in_bytes();
1.174 +
1.175 + // Get methodOop and entrypoint for compiler
1.176 + const Register method = rbx;
1.177 + __ movl(method, Address(rsi, rdx, Address::times_1, method_offset));
1.178 +
1.179 + // Restore saved register, before possible trap.
1.180 + __ popl(rdx);
1.181 +
1.182 + // method (rbx): methodOop
1.183 + // rcx: receiver
1.184 +
1.185 +#ifdef ASSERT
1.186 + if (DebugVtables) {
1.187 + Label L1;
1.188 + __ cmpl(method, NULL_WORD);
1.189 + __ jcc(Assembler::equal, L1);
1.190 + __ cmpl(Address(method, methodOopDesc::from_compiled_offset()), NULL_WORD);
1.191 + __ jcc(Assembler::notZero, L1);
1.192 + __ stop("methodOop is null");
1.193 + __ bind(L1);
1.194 + }
1.195 +#endif // ASSERT
1.196 +
1.197 + address ame_addr = __ pc();
1.198 + __ jmp(Address(method, methodOopDesc::from_compiled_offset()));
1.199 +
1.200 + masm->flush();
1.201 + s->set_exception_points(npe_addr, ame_addr);
1.202 + return s;
1.203 +}
1.204 +
1.205 +
1.206 +
1.207 +int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
1.208 + if (is_vtable_stub) {
1.209 + // Vtable stub size
1.210 + return (DebugVtables ? 210 : 16) + (CountCompiledCalls ? 6 : 0);
1.211 + } else {
1.212 + // Itable stub size
1.213 + return (DebugVtables ? 140 : 55) + (CountCompiledCalls ? 6 : 0);
1.214 + }
1.215 +}
1.216 +
1.217 +int VtableStub::pd_code_alignment() {
1.218 + return wordSize;
1.219 +}
