duke@435: /*
duke@435:  * Copyright 2003-2006 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_64.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,
duke@435:                                           oop receiver,
duke@435:                                           int index);
duke@435: #endif
duke@435: 
duke@435: VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {
duke@435:   const int amd64_code_length = VtableStub::pd_code_size_limit(true);
duke@435:   VtableStub* s = new(amd64_code_length) VtableStub(true, vtable_index);
duke@435:   ResourceMark rm;
duke@435:   CodeBuffer cb(s->entry_point(), amd64_code_length);
duke@435:   MacroAssembler* masm = new MacroAssembler(&cb);
duke@435: 
duke@435: #ifndef PRODUCT
duke@435:   if (CountCompiledCalls) {
duke@435:     __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
duke@435:   }
duke@435: #endif
duke@435: 
duke@435:   // get receiver (need to skip return address on top of stack)
duke@435:   assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
duke@435: 
duke@435:   // Free registers (non-args) are rax, rbx
duke@435: 
duke@435:   // get receiver klass
duke@435:   address npe_addr = __ pc();
duke@435:   __ movq(rax, Address(j_rarg0, oopDesc::klass_offset_in_bytes()));
duke@435: 
duke@435:   // compute entry offset (in words)
duke@435:   int entry_offset =
duke@435:     instanceKlass::vtable_start_offset() + vtable_index * vtableEntry::size();
duke@435: 
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),
duke@435:             vtable_index * vtableEntry::size());
duke@435:     __ jcc(Assembler::greater, L);
duke@435:     __ movl(rbx, vtable_index);
duke@435:     __ call_VM(noreg,
duke@435:                CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), j_rarg0, rbx);
duke@435:     __ bind(L);
duke@435:   }
duke@435: #endif // PRODUCT
duke@435: 
duke@435:   // load methodOop and target address
duke@435:   const Register method = rbx;
duke@435: 
duke@435:   __ movq(method, Address(rax,
duke@435:                           entry_offset * wordSize +
duke@435:                           vtableEntry::method_offset_in_bytes()));
duke@435:   if (DebugVtables) {
duke@435:     Label L;
duke@435:     __ cmpq(method, (int)NULL);
duke@435:     __ jcc(Assembler::equal, L);
duke@435:     __ cmpq(Address(method, methodOopDesc::from_compiled_offset()), (int)NULL_WORD);
duke@435:     __ jcc(Assembler::notZero, L);
duke@435:     __ stop("Vtable entry is NULL");
duke@435:     __ bind(L);
duke@435:   }
duke@435:   // rax: receiver klass
duke@435:   // rbx: methodOop
duke@435:   // rcx: receiver
duke@435:   address ame_addr = __ pc();
duke@435:   __ jmp( Address(rbx, methodOopDesc::from_compiled_offset()));
duke@435: 
duke@435:   __ 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
duke@435:   // away with.  If you add code here, bump the code stub size
duke@435:   // returned by pd_code_size_limit!
duke@435:   const int amd64_code_length = VtableStub::pd_code_size_limit(false);
duke@435:   VtableStub* s = new(amd64_code_length) VtableStub(false, vtable_index);
duke@435:   ResourceMark rm;
duke@435:   CodeBuffer cb(s->entry_point(), amd64_code_length);
duke@435:   MacroAssembler* masm = new MacroAssembler(&cb);
duke@435: 
duke@435: #ifndef PRODUCT
duke@435:   if (CountCompiledCalls) {
duke@435:     __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));
duke@435:   }
duke@435: #endif
duke@435: 
duke@435:   // Entry arguments:
duke@435:   //  rax: Interface
duke@435:   //  j_rarg0: Receiver
duke@435: 
duke@435:   // Free registers (non-args) are rax (interface), rbx
duke@435: 
duke@435:   // get receiver (need to skip return address on top of stack)
duke@435: 
duke@435:   assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");
duke@435:   // get receiver klass (also an implicit null-check)
duke@435:   address npe_addr = __ pc();
duke@435: 
duke@435:   __ movq(rbx, Address(j_rarg0, oopDesc::klass_offset_in_bytes()));
duke@435: 
duke@435:   // If we take a trap while this arg is on the stack we will not
duke@435:   // be able to walk the stack properly. This is not an issue except
duke@435:   // when there are mistakes in this assembly code that could generate
duke@435:   // a spurious fault. Ask me how I know...
duke@435: 
duke@435:   __ pushq(j_rarg1);     // Most registers are in use, so save one
duke@435: 
duke@435:   // compute itable entry offset (in words)
duke@435:   const int base = instanceKlass::vtable_start_offset() * wordSize;
duke@435:   assert(vtableEntry::size() * wordSize == 8,
duke@435:          "adjust the scaling in the code below");
duke@435:   // Get length of vtable
duke@435:   __ movl(j_rarg1,
duke@435:           Address(rbx, instanceKlass::vtable_length_offset() * wordSize));
duke@435:   __ leaq(rbx, Address(rbx, j_rarg1, Address::times_8, base));
duke@435: 
duke@435:   if (HeapWordsPerLong > 1) {
duke@435:     // Round up to align_object_offset boundary
duke@435:     __ round_to_q(rbx, BytesPerLong);
duke@435:   }
dcubed@451:   Label hit, next, entry, throw_icce;
duke@435: 
duke@435:   __ jmpb(entry);
duke@435: 
duke@435:   __ bind(next);
duke@435:   __ addq(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
dcubed@451:   __ movq(j_rarg1, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));
dcubed@451:   __ testq(j_rarg1, j_rarg1);
dcubed@451:   __ jcc(Assembler::zero, throw_icce);
dcubed@451:   __ cmpq(rax, j_rarg1);
dcubed@451:   __ jccb(Assembler::notEqual, next);
duke@435: 
duke@435:   // We found a hit, move offset into j_rarg1
duke@435:   __ movl(j_rarg1, Address(rbx, itableOffsetEntry::offset_offset_in_bytes()));
duke@435: 
duke@435:   // Compute itableMethodEntry
duke@435:   const int method_offset =
duke@435:     (itableMethodEntry::size() * wordSize * vtable_index) +
duke@435:     itableMethodEntry::method_offset_in_bytes();
duke@435: 
duke@435:   // Get methodOop and entrypoint for compiler
duke@435: 
duke@435:   // Get klass pointer again
duke@435:   __ movq(rax, Address(j_rarg0, oopDesc::klass_offset_in_bytes()));
duke@435: 
duke@435:   const Register method = rbx;
duke@435:   __ movq(method, Address(rax, j_rarg1, Address::times_1, method_offset));
duke@435: 
duke@435:   // Restore saved register, before possible trap.
duke@435:   __ popq(j_rarg1);
duke@435: 
duke@435:   // method (rbx): methodOop
duke@435:   // j_rarg0: receiver
duke@435: 
duke@435: 
duke@435: #ifdef ASSERT
dcubed@451:   if (DebugVtables) {
dcubed@451:     Label L2;
dcubed@451:     __ cmpq(method, (int)NULL);
dcubed@451:     __ jcc(Assembler::equal, L2);
dcubed@451:     __ cmpq(Address(method, methodOopDesc::from_compiled_offset()), (int)NULL_WORD);
dcubed@451:     __ jcc(Assembler::notZero, L2);
dcubed@451:     __ stop("compiler entrypoint is null");
dcubed@451:     __ bind(L2);
dcubed@451:   }
duke@435: #endif // ASSERT
duke@435: 
dcubed@451:   // rbx: methodOop
dcubed@451:   // j_rarg0: receiver
dcubed@451:   address ame_addr = __ pc();
dcubed@451:   __ jmp(Address(method, methodOopDesc::from_compiled_offset()));
dcubed@451: 
dcubed@451:   __ bind(throw_icce);
dcubed@451:   // Restore saved register
dcubed@451:   __ popq(j_rarg1);
dcubed@451:   __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
duke@435: 
duke@435:   __ 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: 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 ? 512 : 24) + (CountCompiledCalls ? 13 : 0);
duke@435:   } else {
duke@435:     // Itable stub size
dcubed@451:     return (DebugVtables ? 636 : 72) + (CountCompiledCalls ? 13 : 0);
duke@435:   }
duke@435: }
duke@435: 
duke@435: int VtableStub::pd_code_alignment() {
duke@435:   return wordSize;
duke@435: }