1 /*
   2  * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright 2012, 2013 SAP AG. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #include "precompiled.hpp"
  27 #include "asm/assembler.hpp"
  28 #include "assembler_ppc.inline.hpp"
  29 #include "code/icBuffer.hpp"
  30 #include "gc_interface/collectedHeap.inline.hpp"
  31 #include "interpreter/bytecodes.hpp"
  32 #include "memory/resourceArea.hpp"
  33 #include "nativeInst_ppc.hpp"
  34 #include "oops/oop.inline.hpp"
  35 #include "oops/oop.inline2.hpp"
  36 
  37 #define __ masm.
  38 
  39 int InlineCacheBuffer::ic_stub_code_size() {
  40   return MacroAssembler::load_const_size + MacroAssembler::b64_patchable_size;
  41 }
  42 
  43 void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point) {
  44   ResourceMark rm;
  45   CodeBuffer code(code_begin, ic_stub_code_size());
  46   MacroAssembler masm(&code);
  47   // Note: even though the code contains an embedded metadata, we do not need reloc info
  48   // because
  49   // (1) the metadata is old (i.e., doesn't matter for scavenges)
  50   // (2) these ICStubs are removed *before* a GC happens, so the roots disappear.
  51 
  52   // Load the oop ...
  53   __ load_const(R19_method, (address) cached_value, R0);
  54   // ... and jump to entry point.
  55   __ b64_patchable((address) entry_point, relocInfo::none);
  56 
  57   __ flush();
  58 }
  59 
  60 address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {
  61   NativeMovConstReg* move = nativeMovConstReg_at(code_begin);   // creation also verifies the object
  62   NativeJump*        jump = nativeJump_at(move->next_instruction_address());
  63   return jump->jump_destination();
  64 }
  65 
  66 void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) {
  67   NativeMovConstReg* move = nativeMovConstReg_at(code_begin);   // creation also verifies the object
  68   void* o = (void*)move->data();
  69   return o;
  70 }
  71