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 /*

  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.

  * Copyright 2012, 2013 SAP AG. 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.

  *

  */

 #include "precompiled.hpp"

 #include "asm/assembler.hpp"

 #include "asm/macroAssembler.inline.hpp"

 #include "code/vtableStubs.hpp"

 #include "interp_masm_ppc_64.hpp"

 #include "memory/resourceArea.hpp"

 #include "oops/instanceKlass.hpp"

 #include "oops/klassVtable.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "vmreg_ppc.inline.hpp"

 #ifdef COMPILER2

 #include "opto/runtime.hpp"

 #endif

 #define __ masm->

 #ifdef PRODUCT

 #define BLOCK_COMMENT(str) // nothing

 #else

 #define BLOCK_COMMENT(str) __ block_comment(str)

 #endif

 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")

 #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.

 VtableStub* VtableStubs::create_vtable_stub(int vtable_index) {

   // PPC port: use fixed size.

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

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

   ResourceMark rm;

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

   MacroAssembler* masm = new MacroAssembler(&cb);

   address start_pc;

 #ifndef PRODUCT

   if (CountCompiledCalls) {

     __ load_const(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr());

     __ lwz(R12_scratch2, 0, R11_scratch1);

     __ addi(R12_scratch2, R12_scratch2, 1);

     __ stw(R12_scratch2, 0, R11_scratch1);

   }

 #endif

   assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");

   // Get receiver klass.

   const Register rcvr_klass = R11_scratch1;

   // We might implicit NULL fault here.

   address npe_addr = __ pc(); // npe = null pointer exception

   __ load_klass_with_trap_null_check(rcvr_klass, R3);

  // 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.

     const Register vtable_len = R12_scratch2;

     __ lwz(vtable_len, InstanceKlass::vtable_length_offset()*wordSize, rcvr_klass);

     __ cmpwi(CCR0, vtable_len, vtable_index*vtableEntry::size());

     __ bge(CCR0, L);

     __ li(R12_scratch2, vtable_index);

     __ call_VM(noreg, CAST_FROM_FN_PTR(address, bad_compiled_vtable_index), R3_ARG1, R12_scratch2, false);

     __ bind(L);

   }

 #endif

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

   __ ld(R19_method, v_off, rcvr_klass);

 #ifndef PRODUCT

   if (DebugVtables) {

     Label L;

     __ cmpdi(CCR0, R19_method, 0);

     __ bne(CCR0, L);

     __ stop("Vtable entry is ZERO", 102);

     __ bind(L);

   }

 #endif

   // If the vtable entry is null, the method is abstract.

   address ame_addr = __ pc(); // ame = abstract method error

   __ ld_with_trap_null_check(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);

   __ mtctr(R12_scratch2);

   __ bctr();

   masm->flush();

   guarantee(__ pc() <= s->code_end(), "overflowed buffer");

   s->set_exception_points(npe_addr, ame_addr);

   return s;

 }

 VtableStub* VtableStubs::create_itable_stub(int vtable_index) {

   // PPC port: use fixed size.

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

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

   ResourceMark rm;

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

   MacroAssembler* masm = new MacroAssembler(&cb);

   address start_pc;

 #ifndef PRODUCT

   if (CountCompiledCalls) {

     __ load_const(R11_scratch1, SharedRuntime::nof_megamorphic_calls_addr());

     __ lwz(R12_scratch2, 0, R11_scratch1);

     __ addi(R12_scratch2, R12_scratch2, 1);

     __ stw(R12_scratch2, 0, R11_scratch1);

   }

 #endif

   assert(VtableStub::receiver_location() == R3_ARG1->as_VMReg(), "receiver expected in R3_ARG1");

   // Entry arguments:

   //  R19_method: Interface

   //  R3_ARG1: Receiver

   //

   const Register rcvr_klass = R11_scratch1;

   const Register vtable_len = R12_scratch2;

   const Register itable_entry_addr = R21_tmp1;

   const Register itable_interface = R22_tmp2;

   // Get receiver klass.

   // We might implicit NULL fault here.

   address npe_addr = __ pc(); // npe = null pointer exception

   __ load_klass_with_trap_null_check(rcvr_klass, R3_ARG1);

   //__ ld(rcvr_klass, oopDesc::klass_offset_in_bytes(), R3_ARG1);

   BLOCK_COMMENT("Load start of itable entries into itable_entry.");

   __ lwz(vtable_len, InstanceKlass::vtable_length_offset() * wordSize, rcvr_klass);

   __ slwi(vtable_len, vtable_len, exact_log2(vtableEntry::size() * wordSize));

   __ add(itable_entry_addr, vtable_len, rcvr_klass);

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

   BLOCK_COMMENT("Increment itable_entry_addr in loop.");

   const int vtable_base_offset = InstanceKlass::vtable_start_offset() * wordSize;

   __ addi(itable_entry_addr, itable_entry_addr, vtable_base_offset + itableOffsetEntry::interface_offset_in_bytes());

   const int itable_offset_search_inc = itableOffsetEntry::size() * wordSize;

   Label search;

   __ bind(search);

   __ ld(itable_interface, 0, itable_entry_addr);

   // Handle IncompatibleClassChangeError in itable stubs.

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

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

   BLOCK_COMMENT("Handle IncompatibleClassChangeError in itable stubs.");

   Label throw_icce;

   __ cmpdi(CCR1, itable_interface, 0);

   __ cmpd(CCR0, itable_interface, R19_method);

   __ addi(itable_entry_addr, itable_entry_addr, itable_offset_search_inc);

   __ beq(CCR1, throw_icce);

   __ bne(CCR0, search);

   // Entry found and itable_entry_addr points to it, get offset of vtable for interface.

   const Register vtable_offset = R12_scratch2;

   const Register itable_method = R11_scratch1;

   const int vtable_offset_offset = (itableOffsetEntry::offset_offset_in_bytes() -

                                     itableOffsetEntry::interface_offset_in_bytes()) -

                                    itable_offset_search_inc;

   __ lwz(vtable_offset, vtable_offset_offset, itable_entry_addr);

   // Compute itableMethodEntry and get methodOop and entry point for compiler.

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

     itableMethodEntry::method_offset_in_bytes();

   __ add(itable_method, rcvr_klass, vtable_offset);

   __ ld(R19_method, method_offset, itable_method);

 #ifndef PRODUCT

   if (DebugVtables) {

     Label ok;

     __ cmpd(CCR0, R19_method, 0);

     __ bne(CCR0, ok);

     __ stop("methodOop is null", 103);

     __ bind(ok);

   }

 #endif

   // If the vtable entry is null, the method is abstract.

   address ame_addr = __ pc(); // ame = abstract method error

   // Must do an explicit check if implicit checks are disabled.

   assert(!MacroAssembler::needs_explicit_null_check(in_bytes(Method::from_compiled_offset())), "sanity");

   if (!ImplicitNullChecks || !os::zero_page_read_protected()) {

     if (TrapBasedNullChecks) {

       __ trap_null_check(R19_method);

     } else {

       __ cmpdi(CCR0, R19_method, 0);

       __ beq(CCR0, throw_icce);

     }

   }

   __ ld(R12_scratch2, in_bytes(Method::from_compiled_offset()), R19_method);

   __ mtctr(R12_scratch2);

   __ bctr();

   // Handle IncompatibleClassChangeError in itable stubs.

   // More detailed error message.

   // We force resolving of the call site by jumping to the "handle

   // wrong method" stub, and so let the interpreter runtime do all the

   // dirty work.

   __ bind(throw_icce);

   __ load_const(R11_scratch1, SharedRuntime::get_handle_wrong_method_stub());

   __ mtctr(R11_scratch1);

   __ bctr();

   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 {

     int decode_klass_size = MacroAssembler::instr_size_for_decode_klass_not_null();

     if (is_vtable_stub) {

       return 20 + decode_klass_size +  8 + 8;   // Plain + cOops + Traps + safety

     } else {

       return 96 + decode_klass_size + 12 + 8;   // Plain + cOops + Traps + safety

     }

   }

 }

 int VtableStub::pd_code_alignment() {

   const unsigned int icache_line_size = 32;

   return icache_line_size;

 }