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

 /*

  * Copyright 1997-2008 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_sparc.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, oopDesc* receiver, int index);

 #endif

 // Used by compiler only; may use only caller saved, non-argument registers

 // NOTE:  %%%% if any change is made to this stub make sure that the function

 //             pd_code_size_limit is changed to ensure the correct size for VtableStub

 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {

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

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

   ResourceMark rm;

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

   MacroAssembler* masm = new MacroAssembler(&cb);

 #ifndef PRODUCT

   if (CountCompiledCalls) {

     Address ctr(G5, SharedRuntime::nof_megamorphic_calls_addr());

     __ sethi(ctr);

     __ ld(ctr, G3_scratch);

     __ inc(G3_scratch);

     __ st(G3_scratch, ctr);

   }

 #endif /* PRODUCT */

   assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");

   // get receiver klass

   address npe_addr = __ pc();

   __ load_klass(O0, G3_scratch);

   // set methodOop (in case of interpreted method), and destination address

   int entry_offset = instanceKlass::vtable_start_offset() + vtable_index*vtableEntry::size();

 #ifndef PRODUCT

   if (DebugVtables) {

     Label L;

     // check offset vs vtable length

     __ ld(G3_scratch, instanceKlass::vtable_length_offset()*wordSize, G5);

     __ cmp(G5, vtable_index*vtableEntry::size());

     __ br(Assembler::greaterUnsigned, false, Assembler::pt, L);

     __ delayed()->nop();

     __ set(vtable_index, O2);

     __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), O0, O2);

     __ bind(L);

   }

 #endif

   int v_off = entry_offset*wordSize + vtableEntry::method_offset_in_bytes();

   if( __ is_simm13(v_off) ) {

     __ ld_ptr(G3, v_off, G5_method);

   } else {

     __ set(v_off,G5);

     __ ld_ptr(G3, G5, G5_method);

   }

 #ifndef PRODUCT

   if (DebugVtables) {

     Label L;

     __ br_notnull(G5_method, false, Assembler::pt, L);

     __ delayed()->nop();

     __ stop("Vtable entry is ZERO");

     __ bind(L);

   }

 #endif

   address ame_addr = __ pc();  // if the vtable entry is null, the method is abstract

                                // NOTE: for vtable dispatches, the vtable entry will never be null.

   __ ld_ptr(G5_method, in_bytes(methodOopDesc::from_compiled_offset()), G3_scratch);

   // jump to target (either compiled code or c2iadapter)

   __ JMP(G3_scratch, 0);

   // load methodOop (in case we call c2iadapter)

   __ delayed()->nop();

   masm->flush();

   s->set_exception_points(npe_addr, ame_addr);

   return s;

 }

 // NOTE:  %%%% if any change is made to this stub make sure that the function

 //             pd_code_size_limit is changed to ensure the correct size for VtableStub

 VtableStub* VtableStubs::create_itable_stub(int vtable_index) {

   const int sparc_code_length = VtableStub::pd_code_size_limit(false);

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

   ResourceMark rm;

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

   MacroAssembler* masm = new MacroAssembler(&cb);

   Register G3_klassOop = G3_scratch;

   Register G5_interface = G5;  // Passed in as an argument

   Label search;

   // Entry arguments:

   //  G5_interface: Interface

   //  O0:           Receiver

   assert(VtableStub::receiver_location() == O0->as_VMReg(), "receiver expected in O0");

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

   address npe_addr = __ pc();

   __ load_klass(O0, G3_klassOop);

   __ verify_oop(G3_klassOop);

   // Push a new window to get some temp registers.  This chops the head of all

   // my 64-bit %o registers in the LION build, but this is OK because no longs

   // are passed in the %o registers.  Instead, longs are passed in G1 and G4

   // and so those registers are not available here.

   __ save(SP,-frame::register_save_words*wordSize,SP);

   Register I0_receiver = I0;    // Location of receiver after save

 #ifndef PRODUCT

   if (CountCompiledCalls) {

     Address ctr(L0, SharedRuntime::nof_megamorphic_calls_addr());

     __ sethi(ctr);

     __ ld(ctr, L1);

     __ inc(L1);

     __ st(L1, ctr);

   }

 #endif /* PRODUCT */

   // load start of itable entries into L0 register

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

   __ ld(Address(G3_klassOop, 0, instanceKlass::vtable_length_offset() * wordSize), L0);

   // %%% Could store the aligned, prescaled offset in the klassoop.

   __ sll(L0, exact_log2(vtableEntry::size() * wordSize), L0);

   // see code for instanceKlass::start_of_itable!

   const int vtable_alignment = align_object_offset(1);

   assert(vtable_alignment == 1 || vtable_alignment == 2, "");

   const int odd_bit = vtableEntry::size() * wordSize;

   if (vtable_alignment == 2) {

     __ and3(L0, odd_bit, L1);   // isolate the odd bit

   }

   __ add(G3_klassOop, L0, L0);

   if (vtable_alignment == 2) {

     __ add(L0, L1, L0);         // double the odd bit, to align up

   }

   // Loop over all itable entries until desired interfaceOop (G5_interface) found

   __ bind(search);

   // %%%% Could load both offset and interface in one ldx, if they were

   // in the opposite order.  This would save a load.

   __ ld_ptr(L0, base + itableOffsetEntry::interface_offset_in_bytes(), L1);

   // If the entry is NULL then we've reached the end of the table

   // without finding the expected interface, so throw an exception

   Label throw_icce;

   __ bpr(Assembler::rc_z, false, Assembler::pn, L1, throw_icce);

   __ delayed()->cmp(G5_interface, L1);

   __ brx(Assembler::notEqual, true, Assembler::pn, search);

   __ delayed()->add(L0, itableOffsetEntry::size() * wordSize, L0);

   // entry found and L0 points to it, move offset of vtable for interface into L0

   __ ld(L0, base + itableOffsetEntry::offset_offset_in_bytes(), L0);

   // Compute itableMethodEntry and get methodOop(G5_method) and entrypoint(L0) for compiler

   const int method_offset = (itableMethodEntry::size() * wordSize * vtable_index) + itableMethodEntry::method_offset_in_bytes();

   __ add(G3_klassOop, L0, L1);

   __ ld_ptr(L1, method_offset, G5_method);

 #ifndef PRODUCT

   if (DebugVtables) {

     Label L01;

     __ ld_ptr(L1, method_offset, G5_method);

     __ bpr(Assembler::rc_nz, false, Assembler::pt, G5_method, L01);

     __ delayed()->nop();

     __ stop("methodOop is null");

     __ bind(L01);

     __ verify_oop(G5_method);

   }

 #endif

   // If the following load is through a NULL pointer, we'll take an OS

   // exception that should translate into an AbstractMethodError.  We need the

   // window count to be correct at that time.

   __ restore();                 // Restore registers BEFORE the AME point

   address ame_addr = __ pc();   // if the vtable entry is null, the method is abstract

   __ ld_ptr(G5_method, in_bytes(methodOopDesc::from_compiled_offset()), G3_scratch);

   // G5_method:  methodOop

   // O0:         Receiver

   // G3_scratch: entry point

   __ JMP(G3_scratch, 0);

   __ delayed()->nop();

   __ bind(throw_icce);

   Address icce(G3_scratch, StubRoutines::throw_IncompatibleClassChangeError_entry());

   __ jump_to(icce, 0);

   __ delayed()->restore();

   masm->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 (TraceJumps || DebugVtables || CountCompiledCalls || VerifyOops) return 1000;

   else {

     const int slop = 2*BytesPerInstWord; // sethi;add  (needed for long offsets)

     if (is_vtable_stub) {

       // ld;ld;ld,jmp,nop

       const int basic = 5*BytesPerInstWord +

                         // shift;add for load_klass

                         (UseCompressedOops ? 2*BytesPerInstWord : 0);

       return basic + slop;

     } else {

       // save, ld, ld, sll, and, add, add, ld, cmp, br, add, ld, add, ld, ld, jmp, restore, sethi, jmpl, restore

       const int basic = (20 LP64_ONLY(+ 6)) * BytesPerInstWord +

                         // shift;add for load_klass

                         (UseCompressedOops ? 2*BytesPerInstWord : 0);

       return (basic + slop);

     }

   }

 }

 int VtableStub::pd_code_alignment() {

   // UltraSPARC cache line size is 8 instructions:

   const unsigned int icache_line_size = 32;

   return icache_line_size;

 }