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 /*

  * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.

  * Copyright (c) 2015, 2016, Loongson Technology. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

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  */

 #include "precompiled.hpp"

 #include "asm/macroAssembler.hpp"

 #include "code/vtableStubs.hpp"

 #include "interp_masm_mips_64.hpp"

 #include "memory/resourceArea.hpp"

 //#include "oops/InstanceKlass.hpp"

 #include "oops/klassVtable.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "vmreg_mips.inline.hpp"

 #ifdef COMPILER2

 #include "opto/runtime.hpp"

 #endif

 // 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;  reciever in T0.

 // used registers :

 // Rmethod : receiver klass & method

 // NOTE: If this code is used by the C1, the receiver_location is always 0.

 // when reach here, receiver in T0, klass in T8

 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {

   const int gs2_code_length = VtableStub::pd_code_size_limit(true);

   VtableStub* s = new(gs2_code_length) VtableStub(true, vtable_index);

   ResourceMark rm;

   CodeBuffer cb(s->entry_point(), gs2_code_length);

   MacroAssembler* masm = new MacroAssembler(&cb);

   Register t1 = T8, t2 = Rmethod;

 #ifndef PRODUCT

   if (CountCompiledCalls) {

     __ li(AT, SharedRuntime::nof_megamorphic_calls_addr());

     __ lw(t1, AT , 0);

     __ addiu(t1, t1, 1);

     __ sw(t1, AT,0);

   }

 #endif

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

   //assert(receiver_location == T0->as_VMReg(), "receiver expected in T0");

   // get receiver klass

   address npe_addr = __ pc();

   //add for compressedoops

   __ load_klass(t1, T0);

   // 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

     __ lw(t2, t1, InstanceKlass::vtable_length_offset()*wordSize);

     assert(Assembler::is_simm16(vtable_index*vtableEntry::size()), "change this code");

     __ move(AT, vtable_index*vtableEntry::size());

     __ slt(AT, AT, t2);

     __ bne(AT, R0, L);

     __ delayed()->nop();

     __ move(A2, vtable_index);

     __ move(A1, A0);

     __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), A1, A2);

     __ bind(L);

   }

 #endif // PRODUCT

   // load methodOop and target address

   const Register method = Rmethod;

   __ ld_ptr(method, t1,  entry_offset*wordSize + vtableEntry::method_offset_in_bytes());

   if (DebugVtables) {

     Label L;

     __ beq(method, R0, L);

     __ delayed()->nop();

     __ lw(AT, method,in_bytes(Method::from_compiled_offset()));

     __ bne(AT, R0, L);

     __ delayed()->nop();

     __ stop("Vtable entry is NULL");

     __ bind(L);

   }

   // T8: receiver klass

   // T0: receiver

   // Rmethod: methodOop

   // T9: entry

   address ame_addr = __ pc();

   __ ld_ptr(T9, method,in_bytes(Method::from_compiled_offset()));

   __ jr(T9);

   __ delayed()->nop();

   masm->flush();

   s->set_exception_points(npe_addr, ame_addr);

   return s;

 }

 // i am not sure which register to contain Interface, now i just assume A1. FIXME

 // used registers :

 //  T1 T2

 // when reach here, the receiver in T0, klass in T1

 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 gs2_code_length = VtableStub::pd_code_size_limit(false);

   VtableStub* s = new(gs2_code_length) VtableStub(false, vtable_index);

   ResourceMark rm;

   CodeBuffer cb(s->entry_point(), gs2_code_length);

   MacroAssembler* masm = new MacroAssembler(&cb);

   // we T8,T9 as temparary register, they are free from register allocator

   Register t1 = T8, t2 = T2;

   // Entry arguments:

   //  T1: Interface

   //  T0: Receiver

 #ifndef PRODUCT

   if (CountCompiledCalls) {

     __ li(AT, SharedRuntime::nof_megamorphic_calls_addr());

     __ lw(T8, AT, 0);

     __ addi(T8, T8,1);

     __ sw(T8, AT, 0);

   }

 #endif /* PRODUCT */

   address npe_addr = __ pc();

   //add for compressedoops

   __ load_klass(t1, T0);

   // 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");

   assert(Assembler::is_simm16(base), "change this code");

   __ daddi(t2, t1, base);

   assert(Assembler::is_simm16(InstanceKlass::vtable_length_offset() * wordSize), "change this code");

   __ lw(AT, t1, InstanceKlass::vtable_length_offset() * wordSize);

   __ dsll(AT, AT, Address::times_8);

   __ dadd(t2, t2, AT);

   if (HeapWordsPerLong > 1) {

     __ round_to(t2, BytesPerLong);

   }

   Label hit, entry;

   assert(Assembler::is_simm16(itableOffsetEntry::size() * wordSize), "change this code");

   __ bind(entry);

 #ifdef ASSERT

   // Check that the entry is non-null

   if (DebugVtables) {

     Label L;

     assert(Assembler::is_simm16(itableOffsetEntry::interface_offset_in_bytes()), "change this code");

     __ lw(AT, t1, itableOffsetEntry::interface_offset_in_bytes());

     __ bne(AT, R0, L);

     __ delayed()->nop();

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

     __ bind(L);

   }

 #endif

   assert(Assembler::is_simm16(itableOffsetEntry::interface_offset_in_bytes()), "change this code");

   __ ld_ptr(AT, t2, itableOffsetEntry::interface_offset_in_bytes());

   __ bne(AT, T1, entry);

   __ delayed()->addi(t2, t2, itableOffsetEntry::size() * wordSize);

   // We found a hit, move offset into T9

   __ ld_ptr(t2, t2, itableOffsetEntry::offset_offset_in_bytes() - itableOffsetEntry::size() * wordSize);

   // 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 = ebx;

   const Register method = Rmethod;

   __ dsll(AT, t2, Address::times_1);

   __ add(AT, AT, t1 );

   __ ld_ptr(method, AT,  method_offset);

 #ifdef ASSERT

   if (DebugVtables) {

     Label L1;

     __ beq(method, R0, L1);

     __ delayed()->nop();

     __ lw(AT, method,in_bytes(Method::from_compiled_offset()));

     __ bne(AT, R0, L1);

     __ delayed()->nop();

     __ stop("methodOop is null");

     __ bind(L1);

   }

 #endif // ASSERT

 /*

   // Rmethod: methodOop

   // T0: receiver

   // T9: entry point

   __ jmp(T9);

 #endif // COMPILER2

 */

   address ame_addr = __ pc();

   __ ld_ptr(T9, method,in_bytes(Method::from_compiled_offset()));

   __ jr(T9);

   __ delayed()->nop();

   masm->flush();

   s->set_exception_points(npe_addr, ame_addr);

   return s;

 }

 // NOTE : whenever you change the code above, dont forget to change the const here

 int VtableStub::pd_code_size_limit(bool is_vtable_stub) {

   if (is_vtable_stub) {

     return ( DebugVtables ? 600 : 28) + (CountCompiledCalls ? 24 : 0)+

            (UseCompressedOops ? 16 : 0);

   } else {

     return  ( DebugVtables ? 636 : 72) + (CountCompiledCalls ? 24 : 0)+

             (UseCompressedOops ? 32 : 0);

   }

 }

 int VtableStub::pd_code_alignment() {

   return wordSize;

 }