Java example source code file (sharkIntrinsics.cpp)

This example Java source code file (sharkIntrinsics.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

basicblock, null, pointertype\:\:getunqual, sharkintrinsics, sharkintrinsics\:\:do_intrinsic, sharkintrinsics\:\:do_object_getclass, sharkstate, sharktype\:\:intptr_type, sharktype\:\:oop_type, sharkvalue, sharkvalue\:\:create_jdouble, sharkvalue\:\:create_jint, sharkvalue\:\:create_jobject, value

The sharkIntrinsics.cpp Java example source code

/*
 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 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 "shark/llvmHeaders.hpp"
#include "shark/sharkIntrinsics.hpp"
#include "shark/sharkState.hpp"
#include "shark/sharkValue.hpp"
#include "shark/shark_globals.hpp"

using namespace llvm;

bool SharkIntrinsics::is_intrinsic(ciMethod *target) {
  switch (target->intrinsic_id()) {
  case vmIntrinsics::_none:
    return false;

    // java.lang.Math
  case vmIntrinsics::_min:
  case vmIntrinsics::_max:
  case vmIntrinsics::_dabs:
  case vmIntrinsics::_dsin:
  case vmIntrinsics::_dcos:
  case vmIntrinsics::_dtan:
  case vmIntrinsics::_datan2:
  case vmIntrinsics::_dsqrt:
  case vmIntrinsics::_dlog:
  case vmIntrinsics::_dlog10:
  case vmIntrinsics::_dpow:
  case vmIntrinsics::_dexp:
    return true;

    // java.lang.Object
  case vmIntrinsics::_getClass:
    return true;

    // java.lang.System
  case vmIntrinsics::_currentTimeMillis:
    return true;

    // java.lang.Thread
  case vmIntrinsics::_currentThread:
    return true;

    // sun.misc.Unsafe
  case vmIntrinsics::_compareAndSwapInt:
    return true;

  default:
    if (SharkPerformanceWarnings) {
      warning(
        "unhandled intrinsic vmIntrinsic::%s",
        vmIntrinsics::name_at(target->intrinsic_id()));
    }
  }
  return false;
}

void SharkIntrinsics::inline_intrinsic(ciMethod *target, SharkState *state) {
  SharkIntrinsics intrinsic(state, target);
  intrinsic.do_intrinsic();
}

void SharkIntrinsics::do_intrinsic() {
  switch (target()->intrinsic_id()) {
    // java.lang.Math
  case vmIntrinsics::_min:
    do_Math_minmax(llvm::ICmpInst::ICMP_SLE);
    break;
  case vmIntrinsics::_max:
    do_Math_minmax(llvm::ICmpInst::ICMP_SGE);
    break;
  case vmIntrinsics::_dabs:
    do_Math_1to1(builder()->fabs());
    break;
  case vmIntrinsics::_dsin:
    do_Math_1to1(builder()->sin());
    break;
  case vmIntrinsics::_dcos:
    do_Math_1to1(builder()->cos());
    break;
  case vmIntrinsics::_dtan:
    do_Math_1to1(builder()->tan());
    break;
  case vmIntrinsics::_datan2:
    do_Math_2to1(builder()->atan2());
    break;
  case vmIntrinsics::_dsqrt:
    do_Math_1to1(builder()->sqrt());
    break;
  case vmIntrinsics::_dlog:
    do_Math_1to1(builder()->log());
    break;
  case vmIntrinsics::_dlog10:
    do_Math_1to1(builder()->log10());
    break;
  case vmIntrinsics::_dpow:
    do_Math_2to1(builder()->pow());
    break;
  case vmIntrinsics::_dexp:
    do_Math_1to1(builder()->exp());
    break;

    // java.lang.Object
  case vmIntrinsics::_getClass:
    do_Object_getClass();
    break;

    // java.lang.System
  case vmIntrinsics::_currentTimeMillis:
    do_System_currentTimeMillis();
    break;

    // java.lang.Thread
  case vmIntrinsics::_currentThread:
    do_Thread_currentThread();
    break;

    // sun.misc.Unsafe
  case vmIntrinsics::_compareAndSwapInt:
    do_Unsafe_compareAndSwapInt();
    break;

  default:
    ShouldNotReachHere();
  }
}

void SharkIntrinsics::do_Math_minmax(ICmpInst::Predicate p) {
  // Pop the arguments
  SharkValue *sb = state()->pop();
  SharkValue *sa = state()->pop();
  Value *a = sa->jint_value();
  Value *b = sb->jint_value();

  // Perform the test
  BasicBlock *ip       = builder()->GetBlockInsertionPoint();
  BasicBlock *return_a = builder()->CreateBlock(ip, "return_a");
  BasicBlock *return_b = builder()->CreateBlock(ip, "return_b");
  BasicBlock *done     = builder()->CreateBlock(ip, "done");

  builder()->CreateCondBr(builder()->CreateICmp(p, a, b), return_a, return_b);

  builder()->SetInsertPoint(return_a);
  builder()->CreateBr(done);

  builder()->SetInsertPoint(return_b);
  builder()->CreateBr(done);

  builder()->SetInsertPoint(done);
  PHINode *phi = builder()->CreatePHI(a->getType(), 0, "result");
  phi->addIncoming(a, return_a);
  phi->addIncoming(b, return_b);

  // Push the result
  state()->push(
    SharkValue::create_jint(
      phi,
      sa->zero_checked() && sb->zero_checked()));
}

void SharkIntrinsics::do_Math_1to1(Value *function) {
  SharkValue *empty = state()->pop();
  assert(empty == NULL, "should be");
  state()->push(
    SharkValue::create_jdouble(
      builder()->CreateCall(
        function, state()->pop()->jdouble_value())));
  state()->push(NULL);
}

void SharkIntrinsics::do_Math_2to1(Value *function) {
  SharkValue *empty = state()->pop();
  assert(empty == NULL, "should be");
  Value *y = state()->pop()->jdouble_value();
  empty = state()->pop();
  assert(empty == NULL, "should be");
  Value *x = state()->pop()->jdouble_value();

  state()->push(
    SharkValue::create_jdouble(
      builder()->CreateCall2(function, x, y)));
  state()->push(NULL);
}

void SharkIntrinsics::do_Object_getClass() {
  Value *klass = builder()->CreateValueOfStructEntry(
    state()->pop()->jobject_value(),
    in_ByteSize(oopDesc::klass_offset_in_bytes()),
    SharkType::klass_type(),
    "klass");

  state()->push(
    SharkValue::create_jobject(
      builder()->CreateValueOfStructEntry(
        klass,
        Klass::java_mirror_offset(),
        SharkType::oop_type(),
        "java_mirror"),
      true));
}

void SharkIntrinsics::do_System_currentTimeMillis() {
  state()->push(
    SharkValue::create_jlong(
      builder()->CreateCall(builder()->current_time_millis()),
      false));
  state()->push(NULL);
}

void SharkIntrinsics::do_Thread_currentThread() {
  state()->push(
    SharkValue::create_jobject(
      builder()->CreateValueOfStructEntry(
        thread(), JavaThread::threadObj_offset(),
        SharkType::oop_type(),
        "threadObj"),
      true));
}

void SharkIntrinsics::do_Unsafe_compareAndSwapInt() {
  // Pop the arguments
  Value *x      = state()->pop()->jint_value();
  Value *e      = state()->pop()->jint_value();
  SharkValue *empty = state()->pop();
  assert(empty == NULL, "should be");
  Value *offset = state()->pop()->jlong_value();
  Value *object = state()->pop()->jobject_value();
  Value *unsafe = state()->pop()->jobject_value();

  // Convert the offset
  offset = builder()->CreateCall(
    builder()->unsafe_field_offset_to_byte_offset(),
    offset);

  // Locate the field
  Value *addr = builder()->CreateIntToPtr(
    builder()->CreateAdd(
      builder()->CreatePtrToInt(object, SharkType::intptr_type()),
      builder()->CreateIntCast(offset, SharkType::intptr_type(), true)),
    PointerType::getUnqual(SharkType::jint_type()),
    "addr");

  // Perform the operation
  Value *result = builder()->CreateAtomicCmpXchg(addr, e, x, llvm::SequentiallyConsistent);
  // Push the result
  state()->push(
    SharkValue::create_jint(
      builder()->CreateIntCast(
        builder()->CreateICmpEQ(result, e), SharkType::jint_type(), true),
      false));
}