Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/cpu/x86/vm/vtableStubs_x86_64.cpp
src/cpu/x86/vm/vtableStubs_x86_64.cpp
- changeset 435
- a61af66fc99e
- child 451
- f8236e79048a
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| 1 /* | |
| 2 * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_vtableStubs_x86_64.cpp.incl" | |
| 27 | |
| 28 // machine-dependent part of VtableStubs: create VtableStub of correct size and | |
| 29 // initialize its code | |
| 30 | |
| 31 #define __ masm-> | |
| 32 | |
| 33 #ifndef PRODUCT | |
| 34 extern "C" void bad_compiled_vtable_index(JavaThread* thread, | |
| 35 oop receiver, | |
| 36 int index); | |
| 37 #endif | |
| 38 | |
| 39 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { | |
| 40 const int amd64_code_length = VtableStub::pd_code_size_limit(true); | |
| 41 VtableStub* s = new(amd64_code_length) VtableStub(true, vtable_index); | |
| 42 ResourceMark rm; | |
| 43 CodeBuffer cb(s->entry_point(), amd64_code_length); | |
| 44 MacroAssembler* masm = new MacroAssembler(&cb); | |
| 45 | |
| 46 #ifndef PRODUCT | |
| 47 if (CountCompiledCalls) { | |
| 48 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); | |
| 49 } | |
| 50 #endif | |
| 51 | |
| 52 // get receiver (need to skip return address on top of stack) | |
| 53 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0"); | |
| 54 | |
| 55 // Free registers (non-args) are rax, rbx | |
| 56 | |
| 57 // get receiver klass | |
| 58 address npe_addr = __ pc(); | |
| 59 __ movq(rax, Address(j_rarg0, oopDesc::klass_offset_in_bytes())); | |
| 60 | |
| 61 // compute entry offset (in words) | |
| 62 int entry_offset = | |
| 63 instanceKlass::vtable_start_offset() + vtable_index * vtableEntry::size(); | |
| 64 | |
| 65 #ifndef PRODUCT | |
| 66 if (DebugVtables) { | |
| 67 Label L; | |
| 68 // check offset vs vtable length | |
| 69 __ cmpl(Address(rax, instanceKlass::vtable_length_offset() * wordSize), | |
| 70 vtable_index * vtableEntry::size()); | |
| 71 __ jcc(Assembler::greater, L); | |
| 72 __ movl(rbx, vtable_index); | |
| 73 __ call_VM(noreg, | |
| 74 CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), j_rarg0, rbx); | |
| 75 __ bind(L); | |
| 76 } | |
| 77 #endif // PRODUCT | |
| 78 | |
| 79 // load methodOop and target address | |
| 80 const Register method = rbx; | |
| 81 | |
| 82 __ movq(method, Address(rax, | |
| 83 entry_offset * wordSize + | |
| 84 vtableEntry::method_offset_in_bytes())); | |
| 85 if (DebugVtables) { | |
| 86 Label L; | |
| 87 __ cmpq(method, (int)NULL); | |
| 88 __ jcc(Assembler::equal, L); | |
| 89 __ cmpq(Address(method, methodOopDesc::from_compiled_offset()), (int)NULL_WORD); | |
| 90 __ jcc(Assembler::notZero, L); | |
| 91 __ stop("Vtable entry is NULL"); | |
| 92 __ bind(L); | |
| 93 } | |
| 94 // rax: receiver klass | |
| 95 // rbx: methodOop | |
| 96 // rcx: receiver | |
| 97 address ame_addr = __ pc(); | |
| 98 __ jmp( Address(rbx, methodOopDesc::from_compiled_offset())); | |
| 99 | |
| 100 __ flush(); | |
| 101 s->set_exception_points(npe_addr, ame_addr); | |
| 102 return s; | |
| 103 } | |
| 104 | |
| 105 | |
| 106 VtableStub* VtableStubs::create_itable_stub(int vtable_index) { | |
| 107 // Note well: pd_code_size_limit is the absolute minimum we can get | |
| 108 // away with. If you add code here, bump the code stub size | |
| 109 // returned by pd_code_size_limit! | |
| 110 const int amd64_code_length = VtableStub::pd_code_size_limit(false); | |
| 111 VtableStub* s = new(amd64_code_length) VtableStub(false, vtable_index); | |
| 112 ResourceMark rm; | |
| 113 CodeBuffer cb(s->entry_point(), amd64_code_length); | |
| 114 MacroAssembler* masm = new MacroAssembler(&cb); | |
| 115 | |
| 116 #ifndef PRODUCT | |
| 117 if (CountCompiledCalls) { | |
| 118 __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); | |
| 119 } | |
| 120 #endif | |
| 121 | |
| 122 // Entry arguments: | |
| 123 // rax: Interface | |
| 124 // j_rarg0: Receiver | |
| 125 | |
| 126 // Free registers (non-args) are rax (interface), rbx | |
| 127 | |
| 128 // get receiver (need to skip return address on top of stack) | |
| 129 | |
| 130 assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0"); | |
| 131 // get receiver klass (also an implicit null-check) | |
| 132 address npe_addr = __ pc(); | |
| 133 | |
| 134 __ movq(rbx, Address(j_rarg0, oopDesc::klass_offset_in_bytes())); | |
| 135 | |
| 136 // If we take a trap while this arg is on the stack we will not | |
| 137 // be able to walk the stack properly. This is not an issue except | |
| 138 // when there are mistakes in this assembly code that could generate | |
| 139 // a spurious fault. Ask me how I know... | |
| 140 | |
| 141 __ pushq(j_rarg1); // Most registers are in use, so save one | |
| 142 | |
| 143 // compute itable entry offset (in words) | |
| 144 const int base = instanceKlass::vtable_start_offset() * wordSize; | |
| 145 assert(vtableEntry::size() * wordSize == 8, | |
| 146 "adjust the scaling in the code below"); | |
| 147 // Get length of vtable | |
| 148 __ movl(j_rarg1, | |
| 149 Address(rbx, instanceKlass::vtable_length_offset() * wordSize)); | |
| 150 __ leaq(rbx, Address(rbx, j_rarg1, Address::times_8, base)); | |
| 151 | |
| 152 if (HeapWordsPerLong > 1) { | |
| 153 // Round up to align_object_offset boundary | |
| 154 __ round_to_q(rbx, BytesPerLong); | |
| 155 } | |
| 156 Label hit, next, entry; | |
| 157 | |
| 158 __ jmpb(entry); | |
| 159 | |
| 160 __ bind(next); | |
| 161 __ addq(rbx, itableOffsetEntry::size() * wordSize); | |
| 162 | |
| 163 __ bind(entry); | |
| 164 | |
| 165 #ifdef ASSERT | |
| 166 // Check that the entry is non-null | |
| 167 if (DebugVtables) { | |
| 168 Label L; | |
| 169 __ pushq(rbx); | |
| 170 __ movq(rbx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes())); | |
| 171 __ testq(rbx, rbx); | |
| 172 __ jcc(Assembler::notZero, L); | |
| 173 __ stop("null entry point found in itable's offset table"); | |
| 174 __ bind(L); | |
| 175 __ popq(rbx); | |
| 176 } | |
| 177 #endif | |
| 178 | |
| 179 __ cmpq(rax, Address(rbx, itableOffsetEntry::interface_offset_in_bytes())); | |
| 180 __ jcc(Assembler::notEqual, next); | |
| 181 | |
| 182 // We found a hit, move offset into j_rarg1 | |
| 183 __ movl(j_rarg1, Address(rbx, itableOffsetEntry::offset_offset_in_bytes())); | |
| 184 | |
| 185 // Compute itableMethodEntry | |
| 186 const int method_offset = | |
| 187 (itableMethodEntry::size() * wordSize * vtable_index) + | |
| 188 itableMethodEntry::method_offset_in_bytes(); | |
| 189 | |
| 190 // Get methodOop and entrypoint for compiler | |
| 191 | |
| 192 // Get klass pointer again | |
| 193 __ movq(rax, Address(j_rarg0, oopDesc::klass_offset_in_bytes())); | |
| 194 | |
| 195 const Register method = rbx; | |
| 196 __ movq(method, Address(rax, j_rarg1, Address::times_1, method_offset)); | |
| 197 | |
| 198 // Restore saved register, before possible trap. | |
| 199 __ popq(j_rarg1); | |
| 200 | |
| 201 // method (rbx): methodOop | |
| 202 // j_rarg0: receiver | |
| 203 | |
| 204 | |
| 205 #ifdef ASSERT | |
| 206 if (DebugVtables) { | |
| 207 Label L2; | |
| 208 __ cmpq(method, (int)NULL); | |
| 209 __ jcc(Assembler::equal, L2); | |
| 210 __ cmpq(Address(method, methodOopDesc::from_compiled_offset()), (int)NULL_WORD); | |
| 211 __ jcc(Assembler::notZero, L2); | |
| 212 __ stop("compiler entrypoint is null"); | |
| 213 __ bind(L2); | |
| 214 } | |
| 215 #endif // ASSERT | |
| 216 | |
| 217 // rbx: methodOop | |
| 218 // j_rarg0: receiver | |
| 219 address ame_addr = __ pc(); | |
| 220 __ jmp(Address(method, methodOopDesc::from_compiled_offset())); | |
| 221 | |
| 222 __ flush(); | |
| 223 s->set_exception_points(npe_addr, ame_addr); | |
| 224 return s; | |
| 225 } | |
| 226 | |
| 227 int VtableStub::pd_code_size_limit(bool is_vtable_stub) { | |
| 228 if (is_vtable_stub) { | |
| 229 // Vtable stub size | |
| 230 return (DebugVtables ? 512 : 24) + (CountCompiledCalls ? 13 : 0); | |
| 231 } else { | |
| 232 // Itable stub size | |
| 233 return (DebugVtables ? 636 : 64) + (CountCompiledCalls ? 13 : 0); | |
| 234 } | |
| 235 } | |
| 236 | |
| 237 int VtableStub::pd_code_alignment() { | |
| 238 return wordSize; | |
| 239 } |
