Wed, 16 Feb 2011 13:30:31 -0800
7013964: openjdk LICENSE file needs rebranding
Reviewed-by: darcy, katleman, jjg
duke@435 | 1 | /* |
stefank@2314 | 2 | * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
stefank@2314 | 26 | #include "asm/assembler.hpp" |
stefank@2314 | 27 | #include "assembler_x86.inline.hpp" |
stefank@2314 | 28 | #include "code/vtableStubs.hpp" |
stefank@2314 | 29 | #include "interp_masm_x86_32.hpp" |
stefank@2314 | 30 | #include "memory/resourceArea.hpp" |
stefank@2314 | 31 | #include "oops/instanceKlass.hpp" |
stefank@2314 | 32 | #include "oops/klassVtable.hpp" |
stefank@2314 | 33 | #include "runtime/sharedRuntime.hpp" |
stefank@2314 | 34 | #include "vmreg_x86.inline.hpp" |
stefank@2314 | 35 | #ifdef COMPILER2 |
stefank@2314 | 36 | #include "opto/runtime.hpp" |
stefank@2314 | 37 | #endif |
duke@435 | 38 | |
duke@435 | 39 | // machine-dependent part of VtableStubs: create VtableStub of correct size and |
duke@435 | 40 | // initialize its code |
duke@435 | 41 | |
duke@435 | 42 | #define __ masm-> |
duke@435 | 43 | |
duke@435 | 44 | #ifndef PRODUCT |
duke@435 | 45 | extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index); |
duke@435 | 46 | #endif |
duke@435 | 47 | |
jrose@1058 | 48 | // These stubs are used by the compiler only. |
jrose@1058 | 49 | // Argument registers, which must be preserved: |
jrose@1058 | 50 | // rcx - receiver (always first argument) |
jrose@1058 | 51 | // rdx - second argument (if any) |
jrose@1058 | 52 | // Other registers that might be usable: |
jrose@1058 | 53 | // rax - inline cache register (is interface for itable stub) |
jrose@1058 | 54 | // rbx - method (used when calling out to interpreter) |
jrose@1058 | 55 | // Available now, but may become callee-save at some point: |
jrose@1058 | 56 | // rsi, rdi |
jrose@1058 | 57 | // Note that rax and rdx are also used for return values. |
duke@435 | 58 | // |
duke@435 | 59 | VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { |
duke@435 | 60 | const int i486_code_length = VtableStub::pd_code_size_limit(true); |
duke@435 | 61 | VtableStub* s = new(i486_code_length) VtableStub(true, vtable_index); |
duke@435 | 62 | ResourceMark rm; |
duke@435 | 63 | CodeBuffer cb(s->entry_point(), i486_code_length); |
duke@435 | 64 | MacroAssembler* masm = new MacroAssembler(&cb); |
duke@435 | 65 | |
duke@435 | 66 | #ifndef PRODUCT |
duke@435 | 67 | |
duke@435 | 68 | if (CountCompiledCalls) { |
never@739 | 69 | __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); |
duke@435 | 70 | } |
duke@435 | 71 | #endif /* PRODUCT */ |
duke@435 | 72 | |
duke@435 | 73 | // get receiver (need to skip return address on top of stack) |
duke@435 | 74 | assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx"); |
duke@435 | 75 | |
duke@435 | 76 | // get receiver klass |
duke@435 | 77 | address npe_addr = __ pc(); |
never@739 | 78 | __ movptr(rax, Address(rcx, oopDesc::klass_offset_in_bytes())); |
duke@435 | 79 | // compute entry offset (in words) |
duke@435 | 80 | int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size(); |
duke@435 | 81 | #ifndef PRODUCT |
duke@435 | 82 | if (DebugVtables) { |
duke@435 | 83 | Label L; |
duke@435 | 84 | // check offset vs vtable length |
duke@435 | 85 | __ cmpl(Address(rax, instanceKlass::vtable_length_offset()*wordSize), vtable_index*vtableEntry::size()); |
duke@435 | 86 | __ jcc(Assembler::greater, L); |
duke@435 | 87 | __ movl(rbx, vtable_index); |
duke@435 | 88 | __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), rcx, rbx); |
duke@435 | 89 | __ bind(L); |
duke@435 | 90 | } |
duke@435 | 91 | #endif // PRODUCT |
duke@435 | 92 | |
duke@435 | 93 | const Register method = rbx; |
duke@435 | 94 | |
duke@435 | 95 | // load methodOop and target address |
never@739 | 96 | __ movptr(method, Address(rax, entry_offset*wordSize + vtableEntry::method_offset_in_bytes())); |
duke@435 | 97 | if (DebugVtables) { |
duke@435 | 98 | Label L; |
never@739 | 99 | __ cmpptr(method, (int32_t)NULL_WORD); |
duke@435 | 100 | __ jcc(Assembler::equal, L); |
never@739 | 101 | __ cmpptr(Address(method, methodOopDesc::from_compiled_offset()), (int32_t)NULL_WORD); |
duke@435 | 102 | __ jcc(Assembler::notZero, L); |
duke@435 | 103 | __ stop("Vtable entry is NULL"); |
duke@435 | 104 | __ bind(L); |
duke@435 | 105 | } |
duke@435 | 106 | |
duke@435 | 107 | // rax,: receiver klass |
duke@435 | 108 | // method (rbx): methodOop |
duke@435 | 109 | // rcx: receiver |
duke@435 | 110 | address ame_addr = __ pc(); |
duke@435 | 111 | __ jmp( Address(method, methodOopDesc::from_compiled_offset())); |
duke@435 | 112 | |
duke@435 | 113 | masm->flush(); |
jrose@1058 | 114 | |
jrose@1058 | 115 | if (PrintMiscellaneous && (WizardMode || Verbose)) { |
jrose@1058 | 116 | tty->print_cr("vtable #%d at "PTR_FORMAT"[%d] left over: %d", |
jrose@1058 | 117 | vtable_index, s->entry_point(), |
jrose@1058 | 118 | (int)(s->code_end() - s->entry_point()), |
jrose@1058 | 119 | (int)(s->code_end() - __ pc())); |
jrose@1058 | 120 | } |
jrose@1058 | 121 | guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
jrose@1144 | 122 | // shut the door on sizing bugs |
jrose@1144 | 123 | int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
jrose@1144 | 124 | assert(vtable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
jrose@1058 | 125 | |
duke@435 | 126 | s->set_exception_points(npe_addr, ame_addr); |
duke@435 | 127 | return s; |
duke@435 | 128 | } |
duke@435 | 129 | |
duke@435 | 130 | |
jrose@1058 | 131 | VtableStub* VtableStubs::create_itable_stub(int itable_index) { |
duke@435 | 132 | // Note well: pd_code_size_limit is the absolute minimum we can get away with. If you |
duke@435 | 133 | // add code here, bump the code stub size returned by pd_code_size_limit! |
duke@435 | 134 | const int i486_code_length = VtableStub::pd_code_size_limit(false); |
jrose@1058 | 135 | VtableStub* s = new(i486_code_length) VtableStub(false, itable_index); |
duke@435 | 136 | ResourceMark rm; |
duke@435 | 137 | CodeBuffer cb(s->entry_point(), i486_code_length); |
duke@435 | 138 | MacroAssembler* masm = new MacroAssembler(&cb); |
duke@435 | 139 | |
duke@435 | 140 | // Entry arguments: |
duke@435 | 141 | // rax,: Interface |
duke@435 | 142 | // rcx: Receiver |
duke@435 | 143 | |
duke@435 | 144 | #ifndef PRODUCT |
duke@435 | 145 | if (CountCompiledCalls) { |
never@739 | 146 | __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); |
duke@435 | 147 | } |
duke@435 | 148 | #endif /* PRODUCT */ |
duke@435 | 149 | // get receiver (need to skip return address on top of stack) |
duke@435 | 150 | |
duke@435 | 151 | assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx"); |
duke@435 | 152 | |
duke@435 | 153 | // get receiver klass (also an implicit null-check) |
duke@435 | 154 | address npe_addr = __ pc(); |
jrose@1058 | 155 | __ movptr(rsi, Address(rcx, oopDesc::klass_offset_in_bytes())); |
duke@435 | 156 | |
jrose@1058 | 157 | // Most registers are in use; we'll use rax, rbx, rsi, rdi |
jrose@1058 | 158 | // (If we need to make rsi, rdi callee-save, do a push/pop here.) |
jrose@1058 | 159 | const Register method = rbx; |
jrose@1058 | 160 | Label throw_icce; |
duke@435 | 161 | |
duke@435 | 162 | // Get methodOop and entrypoint for compiler |
jrose@1058 | 163 | __ lookup_interface_method(// inputs: rec. class, interface, itable index |
jrose@1058 | 164 | rsi, rax, itable_index, |
jrose@1058 | 165 | // outputs: method, scan temp. reg |
jrose@1058 | 166 | method, rdi, |
jrose@1058 | 167 | throw_icce); |
duke@435 | 168 | |
duke@435 | 169 | // method (rbx): methodOop |
duke@435 | 170 | // rcx: receiver |
duke@435 | 171 | |
duke@435 | 172 | #ifdef ASSERT |
duke@435 | 173 | if (DebugVtables) { |
duke@435 | 174 | Label L1; |
never@739 | 175 | __ cmpptr(method, (int32_t)NULL_WORD); |
duke@435 | 176 | __ jcc(Assembler::equal, L1); |
never@739 | 177 | __ cmpptr(Address(method, methodOopDesc::from_compiled_offset()), (int32_t)NULL_WORD); |
duke@435 | 178 | __ jcc(Assembler::notZero, L1); |
duke@435 | 179 | __ stop("methodOop is null"); |
duke@435 | 180 | __ bind(L1); |
duke@435 | 181 | } |
duke@435 | 182 | #endif // ASSERT |
duke@435 | 183 | |
duke@435 | 184 | address ame_addr = __ pc(); |
duke@435 | 185 | __ jmp(Address(method, methodOopDesc::from_compiled_offset())); |
duke@435 | 186 | |
dcubed@451 | 187 | __ bind(throw_icce); |
dcubed@451 | 188 | __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); |
duke@435 | 189 | masm->flush(); |
dcubed@451 | 190 | |
jrose@1058 | 191 | if (PrintMiscellaneous && (WizardMode || Verbose)) { |
jrose@1058 | 192 | tty->print_cr("itable #%d at "PTR_FORMAT"[%d] left over: %d", |
jrose@1058 | 193 | itable_index, s->entry_point(), |
jrose@1058 | 194 | (int)(s->code_end() - s->entry_point()), |
jrose@1058 | 195 | (int)(s->code_end() - __ pc())); |
jrose@1058 | 196 | } |
dcubed@451 | 197 | guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
jrose@1144 | 198 | // shut the door on sizing bugs |
jrose@1144 | 199 | int slop = 3; // 32-bit offset is this much larger than an 8-bit one |
jrose@1144 | 200 | assert(itable_index > 10 || __ pc() + slop <= s->code_end(), "room for 32-bit offset"); |
dcubed@451 | 201 | |
duke@435 | 202 | s->set_exception_points(npe_addr, ame_addr); |
duke@435 | 203 | return s; |
duke@435 | 204 | } |
duke@435 | 205 | |
duke@435 | 206 | |
duke@435 | 207 | |
duke@435 | 208 | int VtableStub::pd_code_size_limit(bool is_vtable_stub) { |
duke@435 | 209 | if (is_vtable_stub) { |
duke@435 | 210 | // Vtable stub size |
duke@435 | 211 | return (DebugVtables ? 210 : 16) + (CountCompiledCalls ? 6 : 0); |
duke@435 | 212 | } else { |
duke@435 | 213 | // Itable stub size |
jrose@1058 | 214 | return (DebugVtables ? 256 : 66) + (CountCompiledCalls ? 6 : 0); |
duke@435 | 215 | } |
jrose@1144 | 216 | // In order to tune these parameters, run the JVM with VM options |
jrose@1144 | 217 | // +PrintMiscellaneous and +WizardMode to see information about |
jrose@1144 | 218 | // actual itable stubs. Look for lines like this: |
jrose@1144 | 219 | // itable #1 at 0x5551212[65] left over: 3 |
jrose@1144 | 220 | // Reduce the constants so that the "left over" number is >=3 |
jrose@1144 | 221 | // for the common cases. |
jrose@1144 | 222 | // Do not aim at a left-over number of zero, because a |
jrose@1144 | 223 | // large vtable or itable index (> 16) will require a 32-bit |
jrose@1144 | 224 | // immediate displacement instead of an 8-bit one. |
jrose@1144 | 225 | // |
jrose@1144 | 226 | // The JVM98 app. _202_jess has a megamorphic interface call. |
jrose@1144 | 227 | // The itable code looks like this: |
jrose@1144 | 228 | // Decoding VtableStub itbl[1]@1 |
jrose@1144 | 229 | // mov 0x4(%ecx),%esi |
jrose@1144 | 230 | // mov 0xe8(%esi),%edi |
jrose@1144 | 231 | // lea 0x130(%esi,%edi,4),%edi |
jrose@1144 | 232 | // add $0x7,%edi |
jrose@1144 | 233 | // and $0xfffffff8,%edi |
jrose@1144 | 234 | // lea 0x4(%esi),%esi |
jrose@1144 | 235 | // mov (%edi),%ebx |
jrose@1144 | 236 | // cmp %ebx,%eax |
jrose@1144 | 237 | // je success |
jrose@1144 | 238 | // loop: |
jrose@1144 | 239 | // test %ebx,%ebx |
jrose@1144 | 240 | // je throw_icce |
jrose@1144 | 241 | // add $0x8,%edi |
jrose@1144 | 242 | // mov (%edi),%ebx |
jrose@1144 | 243 | // cmp %ebx,%eax |
jrose@1144 | 244 | // jne loop |
jrose@1144 | 245 | // success: |
jrose@1144 | 246 | // mov 0x4(%edi),%edi |
jrose@1144 | 247 | // mov (%esi,%edi,1),%ebx |
jrose@1144 | 248 | // jmp *0x44(%ebx) |
jrose@1144 | 249 | // throw_icce: |
jrose@1144 | 250 | // jmp throw_ICCE_entry |
duke@435 | 251 | } |
duke@435 | 252 | |
duke@435 | 253 | int VtableStub::pd_code_alignment() { |
duke@435 | 254 | return wordSize; |
duke@435 | 255 | } |