| /* |
| * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| */ |
| |
| #include "incls/_precompiled.incl" |
| #include "incls/_vtableStubs_x86_32.cpp.incl" |
| |
| // machine-dependent part of VtableStubs: create VtableStub of correct size and |
| // initialize its code |
| |
| #define __ masm-> |
| |
| #ifndef PRODUCT |
| extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index); |
| #endif |
| |
| // used by compiler only; may use only caller saved registers rax, rbx, rcx. |
| // rdx holds first int arg, rsi, rdi, rbp are callee-save & must be preserved. |
| // Leave receiver in rcx; required behavior when +OptoArgsInRegisters |
| // is modifed to put first oop in rcx. |
| // |
| VtableStub* VtableStubs::create_vtable_stub(int vtable_index) { |
| const int i486_code_length = VtableStub::pd_code_size_limit(true); |
| VtableStub* s = new(i486_code_length) VtableStub(true, vtable_index); |
| ResourceMark rm; |
| CodeBuffer cb(s->entry_point(), i486_code_length); |
| MacroAssembler* masm = new MacroAssembler(&cb); |
| |
| #ifndef PRODUCT |
| |
| if (CountCompiledCalls) { |
| __ increment(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); |
| } |
| #endif /* PRODUCT */ |
| |
| // get receiver (need to skip return address on top of stack) |
| assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx"); |
| |
| // get receiver klass |
| address npe_addr = __ pc(); |
| __ movl(rax, Address(rcx, oopDesc::klass_offset_in_bytes())); |
| // compute entry offset (in words) |
| int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size(); |
| #ifndef PRODUCT |
| if (DebugVtables) { |
| Label L; |
| // check offset vs vtable length |
| __ cmpl(Address(rax, instanceKlass::vtable_length_offset()*wordSize), vtable_index*vtableEntry::size()); |
| __ jcc(Assembler::greater, L); |
| __ movl(rbx, vtable_index); |
| __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), rcx, rbx); |
| __ bind(L); |
| } |
| #endif // PRODUCT |
| |
| const Register method = rbx; |
| |
| // load methodOop and target address |
| __ movl(method, Address(rax, entry_offset*wordSize + vtableEntry::method_offset_in_bytes())); |
| if (DebugVtables) { |
| Label L; |
| __ cmpl(method, NULL_WORD); |
| __ jcc(Assembler::equal, L); |
| __ cmpl(Address(method, methodOopDesc::from_compiled_offset()), NULL_WORD); |
| __ jcc(Assembler::notZero, L); |
| __ stop("Vtable entry is NULL"); |
| __ bind(L); |
| } |
| |
| // rax,: receiver klass |
| // method (rbx): methodOop |
| // rcx: receiver |
| address ame_addr = __ pc(); |
| __ jmp( Address(method, methodOopDesc::from_compiled_offset())); |
| |
| masm->flush(); |
| s->set_exception_points(npe_addr, ame_addr); |
| return s; |
| } |
| |
| |
| VtableStub* VtableStubs::create_itable_stub(int vtable_index) { |
| // Note well: pd_code_size_limit is the absolute minimum we can get away with. If you |
| // add code here, bump the code stub size returned by pd_code_size_limit! |
| const int i486_code_length = VtableStub::pd_code_size_limit(false); |
| VtableStub* s = new(i486_code_length) VtableStub(false, vtable_index); |
| ResourceMark rm; |
| CodeBuffer cb(s->entry_point(), i486_code_length); |
| MacroAssembler* masm = new MacroAssembler(&cb); |
| |
| // Entry arguments: |
| // rax,: Interface |
| // rcx: Receiver |
| |
| #ifndef PRODUCT |
| if (CountCompiledCalls) { |
| __ increment(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr())); |
| } |
| #endif /* PRODUCT */ |
| // get receiver (need to skip return address on top of stack) |
| |
| assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx"); |
| |
| // get receiver klass (also an implicit null-check) |
| address npe_addr = __ pc(); |
| __ movl(rbx, Address(rcx, oopDesc::klass_offset_in_bytes())); |
| |
| __ movl(rsi, rbx); // Save klass in free register |
| // Most registers are in use, so save a few |
| __ pushl(rdx); |
| // compute itable entry offset (in words) |
| const int base = instanceKlass::vtable_start_offset() * wordSize; |
| assert(vtableEntry::size() * wordSize == 4, "adjust the scaling in the code below"); |
| __ movl(rdx, Address(rbx, instanceKlass::vtable_length_offset() * wordSize)); // Get length of vtable |
| __ leal(rbx, Address(rbx, rdx, Address::times_4, base)); |
| if (HeapWordsPerLong > 1) { |
| // Round up to align_object_offset boundary |
| __ round_to(rbx, BytesPerLong); |
| } |
| |
| Label hit, next, entry, throw_icce; |
| |
| __ jmpb(entry); |
| |
| __ bind(next); |
| __ addl(rbx, itableOffsetEntry::size() * wordSize); |
| |
| __ bind(entry); |
| |
| // If the entry is NULL then we've reached the end of the table |
| // without finding the expected interface, so throw an exception |
| __ movl(rdx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes())); |
| __ testl(rdx, rdx); |
| __ jcc(Assembler::zero, throw_icce); |
| __ cmpl(rax, rdx); |
| __ jcc(Assembler::notEqual, next); |
| |
| // We found a hit, move offset into rbx, |
| __ movl(rdx, Address(rbx, itableOffsetEntry::offset_offset_in_bytes())); |
| |
| // Compute itableMethodEntry. |
| const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + itableMethodEntry::method_offset_in_bytes(); |
| |
| // Get methodOop and entrypoint for compiler |
| const Register method = rbx; |
| __ movl(method, Address(rsi, rdx, Address::times_1, method_offset)); |
| |
| // Restore saved register, before possible trap. |
| __ popl(rdx); |
| |
| // method (rbx): methodOop |
| // rcx: receiver |
| |
| #ifdef ASSERT |
| if (DebugVtables) { |
| Label L1; |
| __ cmpl(method, NULL_WORD); |
| __ jcc(Assembler::equal, L1); |
| __ cmpl(Address(method, methodOopDesc::from_compiled_offset()), NULL_WORD); |
| __ jcc(Assembler::notZero, L1); |
| __ stop("methodOop is null"); |
| __ bind(L1); |
| } |
| #endif // ASSERT |
| |
| address ame_addr = __ pc(); |
| __ jmp(Address(method, methodOopDesc::from_compiled_offset())); |
| |
| __ bind(throw_icce); |
| // Restore saved register |
| __ popl(rdx); |
| __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry())); |
| |
| masm->flush(); |
| |
| guarantee(__ pc() <= s->code_end(), "overflowed buffer"); |
| |
| s->set_exception_points(npe_addr, ame_addr); |
| return s; |
| } |
| |
| |
| |
| int VtableStub::pd_code_size_limit(bool is_vtable_stub) { |
| if (is_vtable_stub) { |
| // Vtable stub size |
| return (DebugVtables ? 210 : 16) + (CountCompiledCalls ? 6 : 0); |
| } else { |
| // Itable stub size |
| return (DebugVtables ? 144 : 64) + (CountCompiledCalls ? 6 : 0); |
| } |
| } |
| |
| int VtableStub::pd_code_alignment() { |
| return wordSize; |
| } |