duke@435: /*
xdono@772:  * Copyright 1997-2008 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: #include "incls/_precompiled.incl"
duke@435: #include "incls/_vtableStubs_x86_32.cpp.incl"
duke@435: 
duke@435: // machine-dependent part of VtableStubs: create VtableStub of correct size and
duke@435: // initialize its code
duke@435: 
duke@435: #define __ masm->
duke@435: 
duke@435: #ifndef PRODUCT
duke@435: extern "C" void bad_compiled_vtable_index(JavaThread* thread, oop receiver, int index);
duke@435: #endif
duke@435: 
duke@435: // used by compiler only; may use only caller saved registers rax, rbx, rcx.
duke@435: // rdx holds first int arg, rsi, rdi, rbp are callee-save & must be preserved.
duke@435: // Leave receiver in rcx; required behavior when +OptoArgsInRegisters
duke@435: // is modifed to put first oop in rcx.
duke@435: //
duke@435: VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
duke@435:   const int i486_code_length = VtableStub::pd_code_size_limit(true);
duke@435:   VtableStub* s = new(i486_code_length) VtableStub(true, vtable_index);
duke@435:   ResourceMark rm;
duke@435:   CodeBuffer cb(s->entry_point(), i486_code_length);
duke@435:   MacroAssembler* masm = new MacroAssembler(&cb);
duke@435: 
duke@435: #ifndef PRODUCT
duke@435: 
duke@435:   if (CountCompiledCalls) {
never@739:     __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
duke@435:   }
duke@435: #endif /* PRODUCT */
duke@435: 
duke@435:   // get receiver (need to skip return address on top of stack)
duke@435:   assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
duke@435: 
duke@435:   // get receiver klass
duke@435:   address npe_addr = __ pc();
never@739:   __ movptr(rax, Address(rcx, oopDesc::klass_offset_in_bytes()));
duke@435:   // compute entry offset (in words)
duke@435:   int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();
duke@435: #ifndef PRODUCT
duke@435:   if (DebugVtables) {
duke@435:     Label L;
duke@435:     // check offset vs vtable length
duke@435:     __ cmpl(Address(rax, instanceKlass::vtable_length_offset()*wordSize), vtable_index*vtableEntry::size());
duke@435:     __ jcc(Assembler::greater, L);
duke@435:     __ movl(rbx, vtable_index);
duke@435:     __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), rcx, rbx);
duke@435:     __ bind(L);
duke@435:   }
duke@435: #endif // PRODUCT
duke@435: 
duke@435:   const Register method = rbx;
duke@435: 
duke@435:   // load methodOop and target address
never@739:   __ movptr(method, Address(rax, entry_offset*wordSize + vtableEntry::method_offset_in_bytes()));
duke@435:   if (DebugVtables) {
duke@435:     Label L;
never@739:     __ cmpptr(method, (int32_t)NULL_WORD);
duke@435:     __ jcc(Assembler::equal, L);
never@739:     __ cmpptr(Address(method, methodOopDesc::from_compiled_offset()), (int32_t)NULL_WORD);
duke@435:     __ jcc(Assembler::notZero, L);
duke@435:     __ stop("Vtable entry is NULL");
duke@435:     __ bind(L);
duke@435:   }
duke@435: 
duke@435:   // rax,: receiver klass
duke@435:   // method (rbx): methodOop
duke@435:   // rcx: receiver
duke@435:   address ame_addr = __ pc();
duke@435:   __ jmp( Address(method, methodOopDesc::from_compiled_offset()));
duke@435: 
duke@435:   masm->flush();
duke@435:   s->set_exception_points(npe_addr, ame_addr);
duke@435:   return s;
duke@435: }
duke@435: 
duke@435: 
duke@435: VtableStub* VtableStubs::create_itable_stub(int vtable_index) {
duke@435:   // Note well: pd_code_size_limit is the absolute minimum we can get away with.  If you
duke@435:   //            add code here, bump the code stub size returned by pd_code_size_limit!
duke@435:   const int i486_code_length = VtableStub::pd_code_size_limit(false);
duke@435:   VtableStub* s = new(i486_code_length) VtableStub(false, vtable_index);
duke@435:   ResourceMark rm;
duke@435:   CodeBuffer cb(s->entry_point(), i486_code_length);
duke@435:   MacroAssembler* masm = new MacroAssembler(&cb);
duke@435: 
duke@435:   // Entry arguments:
duke@435:   //  rax,: Interface
duke@435:   //  rcx: Receiver
duke@435: 
duke@435: #ifndef PRODUCT
duke@435:   if (CountCompiledCalls) {
never@739:     __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
duke@435:   }
duke@435: #endif /* PRODUCT */
duke@435:   // get receiver (need to skip return address on top of stack)
duke@435: 
duke@435:   assert(VtableStub::receiver_location() == rcx->as_VMReg(), "receiver expected in rcx");
duke@435: 
duke@435:   // get receiver klass (also an implicit null-check)
duke@435:   address npe_addr = __ pc();
never@739:   __ movptr(rbx, Address(rcx, oopDesc::klass_offset_in_bytes()));
duke@435: 
never@739:   __ mov(rsi, rbx);   // Save klass in free register
duke@435:   // Most registers are in use, so save a few
never@739:   __ push(rdx);
duke@435:   // compute itable entry offset (in words)
duke@435:   const int base = instanceKlass::vtable_start_offset() * wordSize;
duke@435:   assert(vtableEntry::size() * wordSize == 4, "adjust the scaling in the code below");
duke@435:   __ movl(rdx, Address(rbx, instanceKlass::vtable_length_offset() * wordSize)); // Get length of vtable
never@739:   __ lea(rbx, Address(rbx, rdx, Address::times_ptr, base));
duke@435:   if (HeapWordsPerLong > 1) {
duke@435:     // Round up to align_object_offset boundary
duke@435:     __ round_to(rbx, BytesPerLong);
duke@435:   }
duke@435: 
dcubed@451:   Label hit, next, entry, throw_icce;
duke@435: 
dcubed@451:   __ jmpb(entry);
duke@435: 
duke@435:   __ bind(next);
never@739:   __ addptr(rbx, itableOffsetEntry::size() * wordSize);
duke@435: 
duke@435:   __ bind(entry);
duke@435: 
dcubed@451:   // If the entry is NULL then we've reached the end of the table
dcubed@451:   // without finding the expected interface, so throw an exception
never@739:   __ movptr(rdx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
never@739:   __ testptr(rdx, rdx);
dcubed@451:   __ jcc(Assembler::zero, throw_icce);
never@739:   __ cmpptr(rax, rdx);
duke@435:   __ jcc(Assembler::notEqual, next);
duke@435: 
duke@435:   // We found a hit, move offset into rbx,
duke@435:   __ movl(rdx, Address(rbx, itableOffsetEntry::offset_offset_in_bytes()));
duke@435: 
duke@435:   // Compute itableMethodEntry.
duke@435:   const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + itableMethodEntry::method_offset_in_bytes();
duke@435: 
duke@435:   // Get methodOop and entrypoint for compiler
duke@435:   const Register method = rbx;
never@739:   __ movptr(method, Address(rsi, rdx, Address::times_1, method_offset));
duke@435: 
duke@435:   // Restore saved register, before possible trap.
never@739:   __ pop(rdx);
duke@435: 
duke@435:   // method (rbx): methodOop
duke@435:   // rcx: receiver
duke@435: 
duke@435: #ifdef ASSERT
duke@435:   if (DebugVtables) {
duke@435:       Label L1;
never@739:       __ cmpptr(method, (int32_t)NULL_WORD);
duke@435:       __ jcc(Assembler::equal, L1);
never@739:       __ cmpptr(Address(method, methodOopDesc::from_compiled_offset()), (int32_t)NULL_WORD);
duke@435:       __ jcc(Assembler::notZero, L1);
duke@435:       __ stop("methodOop is null");
duke@435:       __ bind(L1);
duke@435:     }
duke@435: #endif // ASSERT
duke@435: 
duke@435:   address ame_addr = __ pc();
duke@435:   __ jmp(Address(method, methodOopDesc::from_compiled_offset()));
duke@435: 
dcubed@451:   __ bind(throw_icce);
dcubed@451:   // Restore saved register
never@739:   __ pop(rdx);
dcubed@451:   __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
dcubed@451: 
duke@435:   masm->flush();
dcubed@451: 
dcubed@451:   guarantee(__ pc() <= s->code_end(), "overflowed buffer");
dcubed@451: 
duke@435:   s->set_exception_points(npe_addr, ame_addr);
duke@435:   return s;
duke@435: }
duke@435: 
duke@435: 
duke@435: 
duke@435: int VtableStub::pd_code_size_limit(bool is_vtable_stub) {
duke@435:   if (is_vtable_stub) {
duke@435:     // Vtable stub size
duke@435:     return (DebugVtables ? 210 : 16) + (CountCompiledCalls ? 6 : 0);
duke@435:   } else {
duke@435:     // Itable stub size
dcubed@451:     return (DebugVtables ? 144 : 64) + (CountCompiledCalls ? 6 : 0);
duke@435:   }
duke@435: }
duke@435: 
duke@435: int VtableStub::pd_code_alignment() {
duke@435:   return wordSize;
duke@435: }