icBuffer_ppc.cpp

/*
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 * 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
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 * published by the Free Software Foundation.
 *
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 * 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.
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#include "precompiled.hpp"
#include "asm/assembler.hpp"
#include "assembler_ppc.inline.hpp"
#include "code/icBuffer.hpp"
#include "gc_interface/collectedHeap.inline.hpp"
#include "interpreter/bytecodes.hpp"
#include "memory/resourceArea.hpp"
#include "nativeInst_ppc.hpp"
#include "oops/oop.inline.hpp"
#include "oops/oop.inline2.hpp"

#define __ masm.

int InlineCacheBuffer::ic_stub_code_size() {
  return MacroAssembler::load_const_size + MacroAssembler::b64_patchable_size;
}

void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point) {
  ResourceMark rm;
  CodeBuffer code(code_begin, ic_stub_code_size());
  MacroAssembler masm(&code);
  // Note: even though the code contains an embedded metadata, we do not need reloc info
  // because
  // (1) the metadata is old (i.e., doesn't matter for scavenges)
  // (2) these ICStubs are removed *before* a GC happens, so the roots disappear.

  // Load the oop ...
  __ load_const(R19_method, (address) cached_value, R0);
  // ... and jump to entry point.
  __ b64_patchable((address) entry_point, relocInfo::none);

  __ flush();
}

address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {
  NativeMovConstReg* move = nativeMovConstReg_at(code_begin);   // creation also verifies the object
  NativeJump*        jump = nativeJump_at(move->next_instruction_address());
  return jump->jump_destination();
}

void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) {
  NativeMovConstReg* move = nativeMovConstReg_at(code_begin);   // creation also verifies the object
  void* o = (void*)move->data();
  return o;
}