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Java example source code file (sharkCacheDecache.cpp)

This example Java source code file (sharkCacheDecache.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

createaddressofosrbufentry, growablearray, pointertype\:\:getunqual, sharkcacher\:\:read_value_from_frame, sharkdecacher\:\:process_method_slot, sharkdecacher\:\:process_pc_slot, sharkdecacher\:\:start_monitors, sharktype::intptr_type, sharktype::to_stacktype, sharktype\:\:method_type, sharktype\:\:oop_type, sharkvalue, sharkvalue\:\:create_generic, value

The sharkCacheDecache.cpp Java example source code

/*
 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2008, 2009 Red Hat, Inc.
 * 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 "ci/ciMethod.hpp"
#include "code/debugInfoRec.hpp"
#include "shark/llvmValue.hpp"
#include "shark/sharkBuilder.hpp"
#include "shark/sharkCacheDecache.hpp"
#include "shark/sharkFunction.hpp"
#include "shark/sharkState.hpp"

using namespace llvm;

void SharkDecacher::start_frame() {
  // Start recording the debug information
  _pc_offset = code_buffer()->create_unique_offset();
  _oopmap = new OopMap(
    oopmap_slot_munge(stack()->oopmap_frame_size()),
    oopmap_slot_munge(arg_size()));
  debug_info()->add_safepoint(pc_offset(), oopmap());
}

void SharkDecacher::start_stack(int stack_depth) {
  // Create the array we'll record our stack slots in
  _exparray = new GrowableArray<ScopeValue*>(stack_depth);

  // Set the stack pointer
  stack()->CreateStoreStackPointer(
    builder()->CreatePtrToInt(
      stack()->slot_addr(
        stack()->stack_slots_offset() + max_stack() - stack_depth),
      SharkType::intptr_type()));
}

void SharkDecacher::process_stack_slot(int          index,
                                       SharkValue** addr,
                                       int          offset) {
  SharkValue *value = *addr;

  // Write the value to the frame if necessary
  if (stack_slot_needs_write(index, value)) {
    write_value_to_frame(
      SharkType::to_stackType(value->basic_type()),
      value->generic_value(),
      adjusted_offset(value, offset));
  }

  // Record the value in the oopmap if necessary
  if (stack_slot_needs_oopmap(index, value)) {
    oopmap()->set_oop(slot2reg(offset));
  }

  // Record the value in the debuginfo if necessary
  if (stack_slot_needs_debuginfo(index, value)) {
    exparray()->append(slot2lv(offset, stack_location_type(index, addr)));
  }
}

void SharkDecacher::start_monitors(int num_monitors) {
  // Create the array we'll record our monitors in
  _monarray = new GrowableArray<MonitorValue*>(num_monitors);
}

void SharkDecacher::process_monitor(int index, int box_offset, int obj_offset) {
  oopmap()->set_oop(slot2reg(obj_offset));

  monarray()->append(new MonitorValue(
    slot2lv (obj_offset, Location::oop),
    slot2loc(box_offset, Location::normal)));
}

void SharkDecacher::process_oop_tmp_slot(Value** value, int offset) {
  // Decache the temporary oop slot
  if (*value) {
    write_value_to_frame(
      SharkType::oop_type(),
      *value,
      offset);

    oopmap()->set_oop(slot2reg(offset));
  }
}

void SharkDecacher::process_method_slot(Value** value, int offset) {
  // Decache the method pointer
  write_value_to_frame(
    SharkType::Method_type(),
    *value,
    offset);

}

void SharkDecacher::process_pc_slot(int offset) {
  // Record the PC
  builder()->CreateStore(
    builder()->code_buffer_address(pc_offset()),
    stack()->slot_addr(offset));
}

void SharkDecacher::start_locals() {
  // Create the array we'll record our local variables in
  _locarray = new GrowableArray<ScopeValue*>(max_locals());}

void SharkDecacher::process_local_slot(int          index,
                                       SharkValue** addr,
                                       int          offset) {
  SharkValue *value = *addr;

  // Write the value to the frame if necessary
  if (local_slot_needs_write(index, value)) {
    write_value_to_frame(
      SharkType::to_stackType(value->basic_type()),
      value->generic_value(),
      adjusted_offset(value, offset));
  }

  // Record the value in the oopmap if necessary
  if (local_slot_needs_oopmap(index, value)) {
    oopmap()->set_oop(slot2reg(offset));
  }

  // Record the value in the debuginfo if necessary
  if (local_slot_needs_debuginfo(index, value)) {
    locarray()->append(slot2lv(offset, local_location_type(index, addr)));
  }
}

void SharkDecacher::end_frame() {
  // Record the scope
  debug_info()->describe_scope(
    pc_offset(),
    target(),
    bci(),
    true,
    false,
    false,
    debug_info()->create_scope_values(locarray()),
    debug_info()->create_scope_values(exparray()),
    debug_info()->create_monitor_values(monarray()));

  // Finish recording the debug information
  debug_info()->end_safepoint(pc_offset());
}

void SharkCacher::process_stack_slot(int          index,
                                     SharkValue** addr,
                                     int          offset) {
  SharkValue *value = *addr;

  // Read the value from the frame if necessary
  if (stack_slot_needs_read(index, value)) {
    *addr = SharkValue::create_generic(
      value->type(),
      read_value_from_frame(
        SharkType::to_stackType(value->basic_type()),
        adjusted_offset(value, offset)),
      value->zero_checked());
  }
}

void SharkOSREntryCacher::process_monitor(int index,
                                          int box_offset,
                                          int obj_offset) {
  // Copy the monitor from the OSR buffer to the frame
  int src_offset = max_locals() + index * 2;
  builder()->CreateStore(
    builder()->CreateLoad(
      CreateAddressOfOSRBufEntry(src_offset, SharkType::intptr_type())),
    stack()->slot_addr(box_offset, SharkType::intptr_type()));
  builder()->CreateStore(
    builder()->CreateLoad(
      CreateAddressOfOSRBufEntry(src_offset + 1, SharkType::oop_type())),
    stack()->slot_addr(obj_offset, SharkType::oop_type()));
}

void SharkCacher::process_oop_tmp_slot(Value** value, int offset) {
  // Cache the temporary oop
  if (*value)
    *value = read_value_from_frame(SharkType::oop_type(), offset);
}

void SharkCacher::process_method_slot(Value** value, int offset) {
  // Cache the method pointer
  *value = read_value_from_frame(SharkType::Method_type(), offset);
}

void SharkFunctionEntryCacher::process_method_slot(Value** value, int offset) {
  // "Cache" the method pointer
  *value = method();
}

void SharkCacher::process_local_slot(int          index,
                                     SharkValue** addr,
                                     int          offset) {
  SharkValue *value = *addr;

  // Read the value from the frame if necessary
  if (local_slot_needs_read(index, value)) {
    *addr = SharkValue::create_generic(
      value->type(),
      read_value_from_frame(
        SharkType::to_stackType(value->basic_type()),
        adjusted_offset(value, offset)),
      value->zero_checked());
  }
}

Value* SharkOSREntryCacher::CreateAddressOfOSRBufEntry(int         offset,
                                                       Type* type) {
  Value *result = builder()->CreateStructGEP(osr_buf(), offset);
  if (type != SharkType::intptr_type())
    result = builder()->CreateBitCast(result, PointerType::getUnqual(type));
  return result;
}

void SharkOSREntryCacher::process_local_slot(int          index,
                                             SharkValue** addr,
                                             int          offset) {
  SharkValue *value = *addr;

  // Read the value from the OSR buffer if necessary
  if (local_slot_needs_read(index, value)) {
    *addr = SharkValue::create_generic(
      value->type(),
      builder()->CreateLoad(
        CreateAddressOfOSRBufEntry(
          adjusted_offset(value, max_locals() - 1 - index),
          SharkType::to_stackType(value->basic_type()))),
      value->zero_checked());
  }
}

void SharkDecacher::write_value_to_frame(Type* type,
                                         Value*      value,
                                         int         offset) {
  builder()->CreateStore(value, stack()->slot_addr(offset, type));
}

Value* SharkCacher::read_value_from_frame(Type* type, int offset) {
  return builder()->CreateLoad(stack()->slot_addr(offset, type));
}

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