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Merge pull request #203 from jphp-compiler/stage-0.7.0
Stage-0.7.0
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jphp-core/src/org/develnext/jphp/core/common/ObjectSizeCalculator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| package org.develnext.jphp.core.common; | ||
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| import java.lang.reflect.Field; | ||
| import java.util.HashSet; | ||
| import java.util.Set; | ||
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| /** | ||
| * @author Kyrylo Holodnov | ||
| */ | ||
| public class ObjectSizeCalculator { | ||
| private static final int REFERENCE_SIZE; | ||
| private static final int HEADER_SIZE; | ||
| private static final int LONG_SIZE = 8; | ||
| private static final int INT_SIZE = 4; | ||
| private static final int BYTE_SIZE = 1; | ||
| private static final int BOOLEAN_SIZE = 1; | ||
| private static final int CHAR_SIZE = 2; | ||
| private static final int SHORT_SIZE = 2; | ||
| private static final int FLOAT_SIZE = 4; | ||
| private static final int DOUBLE_SIZE = 8; | ||
| private static final int ALIGNMENT = 8; | ||
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| static { | ||
| try { | ||
| if (System.getProperties().get("java.vm.name").toString().contains("64")) { | ||
| //java.vm.name is something like "Java HotSpot(TM) 64-Bit Server VM" | ||
| REFERENCE_SIZE = 8; | ||
| HEADER_SIZE = 16; | ||
| } else { | ||
| REFERENCE_SIZE = 4; | ||
| HEADER_SIZE = 8; | ||
| } | ||
| } catch (Exception ex) { | ||
| ex.printStackTrace(); | ||
| throw new AssertionError(ex); | ||
| } | ||
| } | ||
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| public static long sizeOf(Object o) throws IllegalAccessException { | ||
| return sizeOf(o, new HashSet()); | ||
| } | ||
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| private static long sizeOf(Object o, Set visited) throws IllegalAccessException { | ||
| if (o == null) { | ||
| return 0; | ||
| } | ||
| ObjectWrapper objectWrapper = new ObjectWrapper(o); | ||
| if (visited.contains(objectWrapper)) { | ||
| //We have reference graph with cycles. | ||
| return 0; | ||
| } | ||
| visited.add(objectWrapper); | ||
| long size = HEADER_SIZE; | ||
| Class clazz = o.getClass(); | ||
| if (clazz.isArray()) { | ||
| if (clazz == long[].class) { | ||
| long[] objs = (long[]) o; | ||
| size += objs.length * LONG_SIZE; | ||
| } else if (clazz == int[].class) { | ||
| int[] objs = (int[]) o; | ||
| size += objs.length * INT_SIZE; | ||
| } else if (clazz == byte[].class) { | ||
| byte[] objs = (byte[]) o; | ||
| size += objs.length * BYTE_SIZE; | ||
| } else if (clazz == boolean[].class) { | ||
| boolean[] objs = (boolean[]) o; | ||
| size += objs.length * BOOLEAN_SIZE; | ||
| } else if (clazz == char[].class) { | ||
| char[] objs = (char[]) o; | ||
| size += objs.length * CHAR_SIZE; | ||
| } else if (clazz == short[].class) { | ||
| short[] objs = (short[]) o; | ||
| size += objs.length * SHORT_SIZE; | ||
| } else if (clazz == float[].class) { | ||
| float[] objs = (float[]) o; | ||
| size += objs.length * FLOAT_SIZE; | ||
| } else if (clazz == double[].class) { | ||
| double[] objs = (double[]) o; | ||
| size += objs.length * DOUBLE_SIZE; | ||
| } else { | ||
| Object[] objs = (Object[]) o; | ||
| for (int i = 0; i < objs.length; i++) { | ||
| size += sizeOf(objs[i], visited) + REFERENCE_SIZE; | ||
| } | ||
| } | ||
| size += INT_SIZE; | ||
| } else { | ||
| Field[] fields = o.getClass().getDeclaredFields(); | ||
| for (int i = 0; i < fields.length; i++) { | ||
| if (java.lang.reflect.Modifier.isStatic(fields[i].getModifiers())) { | ||
| continue; | ||
| } | ||
| fields[i].setAccessible(true); | ||
| String fieldType = fields[i].getGenericType().toString(); | ||
| if (fieldType.equals("long")){ | ||
| size += LONG_SIZE; | ||
| }else if (fieldType.equals("int")){ | ||
| size += INT_SIZE; | ||
| }else if (fieldType.equals("byte")){ | ||
| size += BYTE_SIZE; | ||
| }else if (fieldType.equals("boolean")){ | ||
| size += BOOLEAN_SIZE; | ||
| }else if (fieldType.equals("char")){ | ||
| size += CHAR_SIZE; | ||
| }else if (fieldType.equals("short")){ | ||
| size += SHORT_SIZE; | ||
| }else if (fieldType.equals("float")){ | ||
| size += FLOAT_SIZE; | ||
| }else if (fieldType.equals("double")){ | ||
| size += DOUBLE_SIZE; | ||
| }else{ | ||
| size += sizeOf(fields[i].get(o), visited) + REFERENCE_SIZE; | ||
| } | ||
| } | ||
| } | ||
| if ((size % ALIGNMENT) != 0) { | ||
| size = ALIGNMENT * (size / ALIGNMENT) + ALIGNMENT; | ||
| } | ||
| return size; | ||
| } | ||
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| private static final class ObjectWrapper { | ||
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| private Object object; | ||
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| public ObjectWrapper(Object object) { | ||
| this.object = object; | ||
| } | ||
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| @Override | ||
| public boolean equals(Object obj) { | ||
| if (obj == this) { | ||
| return true; | ||
| } | ||
| if ((obj == null) || (obj.getClass() != ObjectWrapper.class)) { | ||
| return false; | ||
| } | ||
| return object == ((ObjectWrapper) obj).object; | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| int hash = 3; | ||
| hash = 47 * hash + System.identityHashCode(object); | ||
| return hash; | ||
| } | ||
| } | ||
| } |
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