SourceDebugExtensionAttributepublic class SourceDebugExtensionAttribute extends Attribute The SourceDebugExtension attribute is an optional attribute defined in JSR-045
in the attributes table of the ClassFile structure. There can be no more than one
SourceDebugExtension attribute in the attributes table of a given ClassFile
structure. The SourceDebugExtension attribute has the following format:
SourceDebugExtension_attribute {
u2 attribute_name_index;
u4 attribute_length;
u1 debug_extension[attribute_length];
}
The items of the SourceDebugExtension_attribute structure are as follows:
- attribute_name_index
- The value of the attribute_name_index item must be a valid index into the
constant_pool table. The constant_pool entry at that index must be a
CONSTANT_Utf8_info structure representing the string "SourceDebugExtension".
- attribute_length
- The value of the attribute_length item indicates the length of
the attribute, excluding the initial six bytes. The value of the
attribute_length item is thus the number of bytes in the debug_extension[]
item.
- debug_extension[]
- The debug_extension array holds a string, which must be in UTF-8 format.
There is no terminating zero byte. The string in the debug_extension item
will be interpreted as extended debugging information. The content of this
string has no semantic effect on the Java Virtual Machine.
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| Fields Summary |
|---|
| public String | debugExtension |
| Constructors Summary |
|---|
public SourceDebugExtensionAttribute()
super("SourceDebugExtension");
| public SourceDebugExtensionAttribute(String debugExtension)
this();
this.debugExtension = debugExtension;
|
| Methods Summary |
|---|
| private byte[] | putUTF8(java.lang.String s)
int charLength = s.length();
int byteLength = 0;
for (int i = 0; i < charLength; ++i) {
char c = s.charAt(i);
if (c >= '\001" && c <= '\177") {
byteLength++;
} else if (c > '\u07FF") {
byteLength += 3;
} else {
byteLength += 2;
}
}
/*if (byteLength > 65535) {
throw new IllegalArgumentException();
}*/
byte[] data = new byte[byteLength];
for (int i = 0; i < charLength;) {
char c = s.charAt(i);
if (c >= '\001" && c <= '\177") {
data[i++] = (byte)c;
} else if (c > '\u07FF") {
data[i++] = (byte)(0xE0 | c >> 12 & 0xF);
data[i++] = (byte)(0x80 | c >> 6 & 0x3F);
data[i++] = (byte)(0x80 | c & 0x3F);
} else {
data[i++] = (byte)(0xC0 | c >> 6 & 0x1F);
data[i++] = (byte)(0x80 | c & 0x3F);
}
}
return data;
| | protected oracle.toplink.libraries.asm.Attribute | read(oracle.toplink.libraries.asm.ClassReader cr, int off, int len, char[] buf, int codeOff, oracle.toplink.libraries.asm.Label[] labels)
return new SourceDebugExtensionAttribute(readUTF8(cr, off, len));
| | private java.lang.String | readUTF8(oracle.toplink.libraries.asm.ClassReader cr, int index, int utfLen)
int endIndex = index + utfLen;
byte[] b = cr.b;
char[] buf = new char[utfLen];
int strLen = 0;
int c, d, e;
while (index < endIndex) {
c = b[index++] & 0xFF;
switch (c >> 4) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
// 0xxxxxxx
buf[strLen++] = (char)c;
break;
case 12:
case 13:
// 110x xxxx 10xx xxxx
d = b[index++];
buf[strLen++] = (char)(((c & 0x1F) << 6) | (d & 0x3F));
break;
default:
// 1110 xxxx 10xx xxxx 10xx xxxx
d = b[index++];
e = b[index++];
buf[strLen++] = (char)(((c & 0x0F) << 12) | ((d & 0x3F) << 6) | (e & 0x3F));
break;
}
}
return new String(buf, 0, strLen);
| | public java.lang.String | toString()
return debugExtension;
| | protected oracle.toplink.libraries.asm.ByteVector | write(oracle.toplink.libraries.asm.ClassWriter cw, byte[] code, int len, int maxStack, int maxLocals)
byte[] b = putUTF8(debugExtension);
return new ByteVector().putByteArray(b, 0, b.length);
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