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

 /*

  * 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;

   __ jmp(entry);

   __ bind(next);

   __ addl(rbx, itableOffsetEntry::size() * wordSize);

   __ bind(entry);

 #ifdef ASSERT

     // Check that the entry is non-null

   if (DebugVtables) {

     Label L;

     __ pushl(rbx);

     __ movl(rbx, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));

     __ testl(rbx, rbx);

     __ jcc(Assembler::notZero, L);

     __ stop("null entry point found in itable's offset table");

     __ bind(L);

     __ popl(rbx);

   }

 #endif

   __ cmpl(rax, Address(rbx, itableOffsetEntry::interface_offset_in_bytes()));

   __ 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()));

   masm->flush();

   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 ? 140 : 55) + (CountCompiledCalls ? 6 : 0);

   }

 }

 int VtableStub::pd_code_alignment() {

   return wordSize;

 }