Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 2003-2006 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_64.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

 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {

   const int amd64_code_length = VtableStub::pd_code_size_limit(true);

   VtableStub* s = new(amd64_code_length) VtableStub(true, vtable_index);

   ResourceMark rm;

   CodeBuffer cb(s->entry_point(), amd64_code_length);

   MacroAssembler* masm = new MacroAssembler(&cb);

 #ifndef PRODUCT

   if (CountCompiledCalls) {

     __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));

   }

 #endif

   // get receiver (need to skip return address on top of stack)

   assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");

   // Free registers (non-args) are rax, rbx

   // get receiver klass

   address npe_addr = __ pc();

   __ load_klass(rax, j_rarg0);

   // 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), j_rarg0, rbx);

     __ bind(L);

   }

 #endif // PRODUCT

   // load methodOop and target address

   const Register method = rbx;

   __ movq(method, Address(rax,

                           entry_offset * wordSize +

                           vtableEntry::method_offset_in_bytes()));

   if (DebugVtables) {

     Label L;

     __ cmpq(method, (int)NULL);

     __ jcc(Assembler::equal, L);

     __ cmpq(Address(method, methodOopDesc::from_compiled_offset()), (int)NULL_WORD);

     __ jcc(Assembler::notZero, L);

     __ stop("Vtable entry is NULL");

     __ bind(L);

   }

   // rax: receiver klass

   // rbx: methodOop

   // rcx: receiver

   address ame_addr = __ pc();

   __ jmp( Address(rbx, methodOopDesc::from_compiled_offset()));

   __ 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 amd64_code_length = VtableStub::pd_code_size_limit(false);

   VtableStub* s = new(amd64_code_length) VtableStub(false, vtable_index);

   ResourceMark rm;

   CodeBuffer cb(s->entry_point(), amd64_code_length);

   MacroAssembler* masm = new MacroAssembler(&cb);

 #ifndef PRODUCT

   if (CountCompiledCalls) {

     __ incrementl(ExternalAddress((address) SharedRuntime::nof_megamorphic_calls_addr()));

   }

 #endif

   // Entry arguments:

   //  rax: Interface

   //  j_rarg0: Receiver

   // Free registers (non-args) are rax (interface), rbx

   // get receiver (need to skip return address on top of stack)

   assert(VtableStub::receiver_location() == j_rarg0->as_VMReg(), "receiver expected in j_rarg0");

   // get receiver klass (also an implicit null-check)

   address npe_addr = __ pc();

   __ load_klass(rbx, j_rarg0);

   // If we take a trap while this arg is on the stack we will not

   // be able to walk the stack properly. This is not an issue except

   // when there are mistakes in this assembly code that could generate

   // a spurious fault. Ask me how I know...

   __ pushq(j_rarg1);     // Most registers are in use, so save one

   // compute itable entry offset (in words)

   const int base = instanceKlass::vtable_start_offset() * wordSize;

   assert(vtableEntry::size() * wordSize == 8,

          "adjust the scaling in the code below");

   // Get length of vtable

   __ movl(j_rarg1,

           Address(rbx, instanceKlass::vtable_length_offset() * wordSize));

   __ leaq(rbx, Address(rbx, j_rarg1, Address::times_8, base));

   if (HeapWordsPerLong > 1) {

     // Round up to align_object_offset boundary

     __ round_to_q(rbx, BytesPerLong);

   }

   Label hit, next, entry, throw_icce;

   __ jmpb(entry);

   __ bind(next);

   __ addq(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

   __ movq(j_rarg1, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));

   __ testq(j_rarg1, j_rarg1);

   __ jcc(Assembler::zero, throw_icce);

   __ cmpq(rax, j_rarg1);

   __ jccb(Assembler::notEqual, next);

   // We found a hit, move offset into j_rarg1

   __ movl(j_rarg1, 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

   // Get klass pointer again

   __ load_klass(rax, j_rarg0);

   const Register method = rbx;

   __ movq(method, Address(rax, j_rarg1, Address::times_1, method_offset));

   // Restore saved register, before possible trap.

   __ popq(j_rarg1);

   // method (rbx): methodOop

   // j_rarg0: receiver

 #ifdef ASSERT

   if (DebugVtables) {

     Label L2;

     __ cmpq(method, (int)NULL);

     __ jcc(Assembler::equal, L2);

     __ cmpq(Address(method, methodOopDesc::from_compiled_offset()), (int)NULL_WORD);

     __ jcc(Assembler::notZero, L2);

     __ stop("compiler entrypoint is null");

     __ bind(L2);

   }

 #endif // ASSERT

   // rbx: methodOop

   // j_rarg0: receiver

   address ame_addr = __ pc();

   __ jmp(Address(method, methodOopDesc::from_compiled_offset()));

   __ bind(throw_icce);

   // Restore saved register

   __ popq(j_rarg1);

   __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));

   __ 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 ? 512 : 24) + (CountCompiledCalls ? 13 : 0) +

            (UseCompressedOops ? 16 : 0);  // 1 leaq can be 3 bytes + 1 long

   } else {

     // Itable stub size

     return (DebugVtables ? 636 : 72) + (CountCompiledCalls ? 13 : 0) +

            (UseCompressedOops ? 32 : 0);  // 2 leaqs

   }

 }

 int VtableStub::pd_code_alignment() {

   return wordSize;

 }