src/share/vm/shark/sharkValue.cpp

/*
 * Copyright (c) 1999, 2010, 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/ciType.hpp"
#include "shark/llvmHeaders.hpp"
#include "shark/llvmValue.hpp"
#include "shark/sharkBuilder.hpp"
#include "shark/sharkValue.hpp"

using namespace llvm;

// Cloning

SharkValue* SharkNormalValue::clone() const {
  return SharkValue::create_generic(type(), generic_value(), zero_checked());
}
SharkValue* SharkPHIValue::clone() const {
  return SharkValue::create_phi(type(), (PHINode *) generic_value(), this);
}
SharkValue* SharkAddressValue::clone() const {
  return SharkValue::address_constant(address_value());
}

// Casting

bool SharkValue::is_phi() const {
  return false;
}
bool SharkPHIValue::is_phi() const {
  return true;
}
SharkPHIValue* SharkValue::as_phi() {
  ShouldNotCallThis();
}
SharkPHIValue* SharkPHIValue::as_phi() {
  return this;
}

// Comparison

bool SharkNormalValue::equal_to(SharkValue *other) const {
  return (this->type()          == other->type() &&
          this->generic_value() == other->generic_value() &&
          this->zero_checked()  == other->zero_checked());
}
bool SharkAddressValue::equal_to(SharkValue *other) const {
  return (this->address_value() == other->address_value());
}

// Type access

ciType* SharkValue::type() const {
  ShouldNotCallThis();
}
ciType* SharkNormalValue::type() const {
  return _type;
}

BasicType SharkNormalValue::basic_type() const {
  return type()->basic_type();
}
BasicType SharkAddressValue::basic_type() const {
  return T_ADDRESS;
}

int SharkNormalValue::size() const {
  return type()->size();
}
int SharkAddressValue::size() const {
  return 1;
}

bool SharkValue::is_jint() const {
  return false;
}
bool SharkValue::is_jlong() const {
  return false;
}
bool SharkValue::is_jfloat() const {
  return false;
}
bool SharkValue::is_jdouble() const {
  return false;
}
bool SharkValue::is_jobject() const {
  return false;
}
bool SharkValue::is_jarray() const {
  return false;
}
bool SharkValue::is_address() const {
  return false;
}

bool SharkNormalValue::is_jint() const {
  return llvm_value()->getType() == SharkType::jint_type();
}
bool SharkNormalValue::is_jlong() const {
  return llvm_value()->getType() == SharkType::jlong_type();
}
bool SharkNormalValue::is_jfloat() const {
  return llvm_value()->getType() == SharkType::jfloat_type();
}
bool SharkNormalValue::is_jdouble() const {
  return llvm_value()->getType() == SharkType::jdouble_type();
}
bool SharkNormalValue::is_jobject() const {
  return llvm_value()->getType() == SharkType::oop_type();
}
bool SharkNormalValue::is_jarray() const {
  return basic_type() == T_ARRAY;
}
bool SharkAddressValue::is_address() const {
  return true;
}

// Typed conversions from SharkValues

Value* SharkValue::jint_value() const {
  ShouldNotCallThis();
}
Value* SharkValue::jlong_value() const {
  ShouldNotCallThis();
}
Value* SharkValue::jfloat_value() const {
  ShouldNotCallThis();
}
Value* SharkValue::jdouble_value() const {
  ShouldNotCallThis();
}
Value* SharkValue::jobject_value() const {
  ShouldNotCallThis();
}
Value* SharkValue::jarray_value() const {
  ShouldNotCallThis();
}
int SharkValue::address_value() const {
  ShouldNotCallThis();
}

Value* SharkNormalValue::jint_value() const {
  assert(is_jint(), "should be");
  return llvm_value();
}
Value* SharkNormalValue::jlong_value() const {
  assert(is_jlong(), "should be");
  return llvm_value();
}
Value* SharkNormalValue::jfloat_value() const {
  assert(is_jfloat(), "should be");
  return llvm_value();
}
Value* SharkNormalValue::jdouble_value() const {
  assert(is_jdouble(), "should be");
  return llvm_value();
}
Value* SharkNormalValue::jobject_value() const {
  assert(is_jobject(), "should be");
  return llvm_value();
}
Value* SharkNormalValue::jarray_value() const {
  // XXX assert(is_jarray(), "should be");
  // XXX http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=324
  assert(is_jobject(), "should be");
  return llvm_value();
}
int SharkAddressValue::address_value() const {
  return _bci;
}

// Type-losing conversions -- use with care!

Value* SharkNormalValue::generic_value() const {
  return llvm_value();
}
Value* SharkAddressValue::generic_value() const {
  return LLVMValue::intptr_constant(address_value());
}

Value* SharkValue::intptr_value(SharkBuilder* builder) const {
  ShouldNotCallThis();
}
Value* SharkNormalValue::intptr_value(SharkBuilder* builder) const {
  return builder->CreatePtrToInt(jobject_value(), SharkType::intptr_type());
}

// Phi-style stuff for SharkPHIState::add_incoming

void SharkValue::addIncoming(SharkValue *value, BasicBlock* block) {
  ShouldNotCallThis();
}
void SharkPHIValue::addIncoming(SharkValue *value, BasicBlock* block) {
  assert(!is_clone(), "shouldn't be");
  ((llvm::PHINode *) generic_value())->addIncoming(
      value->generic_value(), block);
  if (!value->zero_checked())
    _all_incomers_zero_checked = false;
}
void SharkAddressValue::addIncoming(SharkValue *value, BasicBlock* block) {
  assert(this->equal_to(value), "should be");
}

// Phi-style stuff for SharkState::merge

SharkValue* SharkNormalValue::merge(SharkBuilder* builder,
                                    SharkValue*   other,
                                    BasicBlock*   other_block,
                                    BasicBlock*   this_block,
                                    const char*   name) {
  assert(type() == other->type(), "should be");
  assert(zero_checked() == other->zero_checked(), "should be");

  PHINode *phi = builder->CreatePHI(SharkType::to_stackType(type()), 0, name);
  phi->addIncoming(this->generic_value(), this_block);
  phi->addIncoming(other->generic_value(), other_block);
  return SharkValue::create_generic(type(), phi, zero_checked());
}
SharkValue* SharkAddressValue::merge(SharkBuilder* builder,
                                     SharkValue*   other,
                                     BasicBlock*   other_block,
                                     BasicBlock*   this_block,
                                     const char*   name) {
  assert(this->equal_to(other), "should be");
  return this;
}

// Repeated null and divide-by-zero check removal

bool SharkValue::zero_checked() const {
  ShouldNotCallThis();
}
void SharkValue::set_zero_checked(bool zero_checked) {
  ShouldNotCallThis();
}

bool SharkNormalValue::zero_checked() const {
  return _zero_checked;
}
void SharkNormalValue::set_zero_checked(bool zero_checked) {
  _zero_checked = zero_checked;
}