package org.eclipse.jdt.internal.compiler.classfmt; | |
/* | |
* (c) Copyright IBM Corp. 2000, 2001. | |
* All Rights Reserved. | |
*/ | |
import org.eclipse.jdt.internal.compiler.env.*; | |
import org.eclipse.jdt.internal.compiler.impl.*; | |
import org.eclipse.jdt.internal.compiler.ast.*; | |
import org.eclipse.jdt.internal.compiler.codegen.*; | |
import org.eclipse.jdt.internal.compiler.util.*; | |
public class FieldInfo extends ClassFileStruct implements AttributeNamesConstants, IBinaryField { | |
private Constant constant; | |
private boolean isDeprecated; | |
private int[] constantPoolOffsets; | |
private int accessFlags; | |
private char[] name; | |
private char[] signature; | |
private int attributesCount; | |
private int attributeBytes; | |
/** | |
* @param classFileBytes byte[] | |
* @param offsets int[] | |
* @param offset int | |
*/ | |
public FieldInfo (byte classFileBytes[], int offsets[], int offset) throws ClassFormatException { | |
super(classFileBytes, offset); | |
constantPoolOffsets = offsets; | |
accessFlags = -1; | |
int attributesCount = u2At(6); | |
int readOffset = 8; | |
for (int i = 0; i < attributesCount; i++) { | |
readOffset += (6 + u4At(readOffset + 2)); | |
} | |
attributeBytes = readOffset; | |
} | |
/** | |
* Return the constant of the field. | |
* Return org.eclipse.jdt.internal.compiler.Constant.NotAConstant if there is none. | |
* @return org.eclipse.jdt.internal.compiler.Constant | |
*/ | |
public Constant getConstant() { | |
if (constant == null) { | |
// read constant | |
readConstantAttribute(); | |
} | |
return constant; | |
} | |
/** | |
* Answer an int whose bits are set according the access constants | |
* defined by the VM spec. | |
* Set the AccDeprecated and AccSynthetic bits if necessary | |
* @return int | |
*/ | |
public int getModifiers() { | |
if (accessFlags == -1) { | |
// compute the accessflag. Don't forget the deprecated attribute | |
accessFlags = u2At(0); | |
readDeprecatedAttributes(); | |
if (isDeprecated) { | |
accessFlags |= AccDeprecated; | |
} | |
if (isSynthetic()) { | |
accessFlags |= AccSynthetic; | |
} | |
} | |
return accessFlags; | |
} | |
/** | |
* Answer the name of the field. | |
* @return char[] | |
*/ | |
public char[] getName() { | |
if (name == null) { | |
// read the name | |
int utf8Offset = constantPoolOffsets[u2At(2)] - structOffset; | |
name = utf8At(utf8Offset + 3, u2At(utf8Offset + 1)); | |
} | |
return name; | |
} | |
/** | |
* Answer the resolved name of the receiver's type in the | |
* class file format as specified in section 4.3.2 of the Java 2 VM spec. | |
* | |
* For example: | |
* - java.lang.String is Ljava/lang/String; | |
* - an int is I | |
* - a 2 dimensional array of strings is [[Ljava/lang/String; | |
* - an array of floats is [F | |
* @return char[] | |
*/ | |
public char[] getTypeName() { | |
if (signature == null) { | |
// read the signature | |
int utf8Offset = constantPoolOffsets[u2At(4)] - structOffset; | |
signature = utf8At(utf8Offset + 3, u2At(utf8Offset + 1)); | |
} | |
return signature; | |
} | |
/** | |
* Return a wrapper that contains the constant of the field. | |
* Throws a java.ibm.compiler.java.classfmt.ClassFormatException in case the signature is | |
* incompatible with the constant tag. | |
* | |
* @exception java.ibm.compiler.java.classfmt.ClassFormatException | |
* @return java.lang.Object | |
*/ | |
public Object getWrappedConstantValue() throws ClassFormatException { | |
int attributesCount = u2At(6); | |
int readOffset = 8; | |
for (int i = 0; i < attributesCount; i++) { | |
int utf8Offset = constantPoolOffsets[u2At(8)] - structOffset; | |
char[] attributeName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1)); | |
if (CharOperation | |
.equals(attributeName, ConstantValueName)) { | |
// read the right constant | |
int relativeOffset = constantPoolOffsets[u2At(14)] - structOffset; | |
switch (u1At(relativeOffset)) { | |
case IntegerTag : | |
return new Integer(i4At(relativeOffset + 1)); | |
case FloatTag : | |
return new Float(floatAt(relativeOffset + 1)); | |
case DoubleTag : | |
return new Double(doubleAt(relativeOffset + 1)); | |
case LongTag : | |
return new Long(i8At(relativeOffset + 1)); | |
case StringTag : | |
utf8Offset = constantPoolOffsets[u2At(relativeOffset + 1)] - structOffset; | |
return String.valueOf(utf8At(utf8Offset + 3, u2At(utf8Offset + 1))); | |
} | |
} | |
readOffset += (6 + u4At(readOffset + 2)); | |
} | |
return null; | |
} | |
/** | |
* Return true if the field has a constant value attribute, false otherwise. | |
* @return boolean | |
*/ | |
public boolean hasConstant() { | |
int attributesCount = u2At(6); | |
int readOffset = 8; | |
boolean isConstant = false; | |
for (int i = 0; i < attributesCount; i++) { | |
int utf8Offset = constantPoolOffsets[u2At(8)] - structOffset; | |
char[] attributeName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1)); | |
if (CharOperation.equals(attributeName, ConstantValueName)) { | |
isConstant = true; | |
} | |
readOffset += (6 + u4At(readOffset + 2)); | |
} | |
return isConstant; | |
} | |
/** | |
* Return true if the field is a synthetic field, false otherwise. | |
* @return boolean | |
*/ | |
private boolean isSynthetic() { | |
int attributesCount = u2At(6); | |
int readOffset = 8; | |
boolean isSynthetic = false; | |
for (int i = 0; i < attributesCount; i++) { | |
int utf8Offset = constantPoolOffsets[u2At(8)] - structOffset; | |
char[] attributeName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1)); | |
if (CharOperation.equals(attributeName, SyntheticName)) { | |
isSynthetic = true; | |
} | |
readOffset += (6 + u4At(readOffset + 2)); | |
} | |
return isSynthetic; | |
} | |
private void readConstantAttribute() { | |
int attributesCount = u2At(6); | |
int readOffset = 8; | |
boolean isConstant = false; | |
for (int i = 0; i < attributesCount; i++) { | |
int utf8Offset = constantPoolOffsets[u2At(8)] - structOffset; | |
char[] attributeName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1)); | |
if (CharOperation | |
.equals(attributeName, ConstantValueName)) { | |
isConstant = true; | |
// read the right constant | |
int relativeOffset = constantPoolOffsets[u2At(14)] - structOffset; | |
switch (u1At(relativeOffset)) { | |
case IntegerTag : | |
char[] sign = getTypeName(); | |
if (sign.length == 1) { | |
switch (sign[0]) { | |
case 'Z' : // boolean constant | |
constant = new BooleanConstant(i4At(relativeOffset + 1) == 1); | |
break; | |
case 'I' : // integer constant | |
constant = new IntConstant(i4At(relativeOffset + 1)); | |
break; | |
case 'C' : // char constant | |
constant = new CharConstant((char) i4At(relativeOffset + 1)); | |
break; | |
case 'B' : // byte constant | |
constant = new ByteConstant((byte) i4At(relativeOffset + 1)); | |
break; | |
case 'S' : // short constant | |
constant = new ShortConstant((short) i4At(relativeOffset + 1)); | |
break; | |
default: | |
constant = Constant.NotAConstant; | |
} | |
} else { | |
constant = Constant.NotAConstant; | |
} | |
break; | |
case FloatTag : | |
constant = new FloatConstant(floatAt(relativeOffset + 1)); | |
break; | |
case DoubleTag : | |
constant = new DoubleConstant(doubleAt(relativeOffset + 1)); | |
break; | |
case LongTag : | |
constant = new LongConstant(i8At(relativeOffset + 1)); | |
break; | |
case StringTag : | |
utf8Offset = constantPoolOffsets[u2At(relativeOffset + 1)] - structOffset; | |
constant = | |
new StringConstant( | |
String.valueOf(utf8At(utf8Offset + 3, u2At(utf8Offset + 1)))); | |
break; | |
} | |
} | |
readOffset += (6 + u4At(readOffset + 2)); | |
} | |
if (!isConstant) { | |
constant = Constant.NotAConstant; | |
} | |
} | |
private void readDeprecatedAttributes() { | |
int attributesCount = u2At(6); | |
int readOffset = 8; | |
for (int i = 0; i < attributesCount; i++) { | |
int utf8Offset = constantPoolOffsets[u2At(readOffset)] - structOffset; | |
char[] attributeName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1)); | |
if (CharOperation.equals(attributeName, DeprecatedName)) { | |
isDeprecated = true; | |
} | |
readOffset += (6 + u4At(readOffset + 2)); | |
} | |
} | |
/** | |
* Answer the size of the receiver in bytes. | |
* | |
* @return int | |
*/ | |
public int sizeInBytes() { | |
return attributeBytes; | |
} | |
public void throwFormatException() throws ClassFormatException { | |
throw new ClassFormatException(ClassFormatException.ErrBadFieldInfo); | |
} | |
public String toString() { | |
StringBuffer buffer = new StringBuffer(this.getClass().getName()); | |
int modifiers = getModifiers(); | |
return buffer | |
.append("{"/*nonNLS*/) | |
.append( | |
((modifiers & AccDeprecated) != 0 ? "deprecated "/*nonNLS*/ : ""/*nonNLS*/) | |
+ ((modifiers & 0x0001) == 1 ? "public "/*nonNLS*/ : ""/*nonNLS*/) | |
+ ((modifiers & 0x0002) == 0x0002 ? "private "/*nonNLS*/ : ""/*nonNLS*/) | |
+ ((modifiers & 0x0004) == 0x0004 ? "protected "/*nonNLS*/ : ""/*nonNLS*/) | |
+ ((modifiers & 0x0008) == 0x000008 ? "static "/*nonNLS*/ : ""/*nonNLS*/) | |
+ ((modifiers & 0x0010) == 0x0010 ? "final "/*nonNLS*/ : ""/*nonNLS*/) | |
+ ((modifiers & 0x0040) == 0x0040 ? "volatile "/*nonNLS*/ : ""/*nonNLS*/) | |
+ ((modifiers & 0x0080) == 0x0080 ? "transient "/*nonNLS*/ : ""/*nonNLS*/)) | |
.append(getTypeName()) | |
.append(" "/*nonNLS*/) | |
.append(getName()) | |
.append(" "/*nonNLS*/) | |
.append(getConstant()) | |
.append("}"/*nonNLS*/) | |
.toString(); | |
} | |
} |