/** Write a single method with the byte code associated with it. */
private void writeMethod(Method method, int method_number) throws IOException {
// Get raw signature
String signature = method.getSignature();
// Get array of strings containing the argument types
String[] args = Utility.methodSignatureArgumentTypes(signature, false);
// Get return type string
String type = Utility.methodSignatureReturnType(signature, false);
// Get method name
String name = method.getName();
String html_name = Class2HTML.toHTML(name);
// Get method's access flags
String access = Utility.accessToString(method.getAccessFlags());
access = Utility.replace(access, " ", " ");
// Get the method's attributes, the Code Attribute in particular
Attribute[] attributes = method.getAttributes();
file.print(
"<P><B><FONT COLOR=\"#FF0000\">"
+ access
+ "</FONT> "
+ "<A NAME=method"
+ method_number
+ ">"
+ Class2HTML.referenceType(type)
+ "</A> <A HREF=\""
+ class_name
+ "_methods.html#method"
+ method_number
+ "\" TARGET=Methods>"
+ html_name
+ "</A>(");
for (int i = 0; i < args.length; i++) {
file.print(Class2HTML.referenceType(args[i]));
if (i < args.length - 1) {
file.print(", ");
}
}
file.println(")</B></P>");
Code c = null;
byte[] code = null;
if (attributes.length > 0) {
file.print("<H4>Attributes</H4><UL>\n");
for (int i = 0; i < attributes.length; i++) {
byte tag = attributes[i].getTag();
if (tag != ATTR_UNKNOWN) {
file.print(
"<LI><A HREF=\""
+ class_name
+ "_attributes.html#method"
+ method_number
+ "@"
+ i
+ "\" TARGET=Attributes>"
+ ATTRIBUTE_NAMES[tag]
+ "</A></LI>\n");
} else {
file.print("<LI>" + attributes[i] + "</LI>");
}
if (tag == ATTR_CODE) {
c = (Code) attributes[i];
Attribute[] attributes2 = c.getAttributes();
code = c.getCode();
file.print("<UL>");
for (int j = 0; j < attributes2.length; j++) {
tag = attributes2[j].getTag();
file.print(
"<LI><A HREF=\""
+ class_name
+ "_attributes.html#"
+ "method"
+ method_number
+ "@"
+ i
+ "@"
+ j
+ "\" TARGET=Attributes>"
+ ATTRIBUTE_NAMES[tag]
+ "</A></LI>\n");
}
file.print("</UL>");
}
}
file.println("</UL>");
}
if (code != null) { // No code, an abstract method, e.g.
// System.out.println(name + "\n" + Utility.codeToString(code, constant_pool, 0, -1));
// Print the byte code
ByteSequence stream = new ByteSequence(code);
stream.mark(stream.available());
findGotos(stream, method, c);
stream.reset();
file.println(
"<TABLE BORDER=0><TR><TH ALIGN=LEFT>Byte<BR>offset</TH>"
+ "<TH ALIGN=LEFT>Instruction</TH><TH ALIGN=LEFT>Argument</TH>");
for (int i = 0; stream.available() > 0; i++) {
int offset = stream.getIndex();
String str = codeToHTML(stream, method_number);
String anchor = "";
/* Set an anchor mark if this line is targetted by a goto, jsr, etc.
* Defining an anchor for every line is very inefficient!
*/
if (goto_set.get(offset)) {
anchor = "<A NAME=code" + method_number + "@" + offset + "></A>";
}
String anchor2;
if (stream.getIndex() == code.length) {
anchor2 = "<A NAME=code" + method_number + "@" + code.length + ">" + offset + "</A>";
} else {
anchor2 = "" + offset;
}
file.println("<TR VALIGN=TOP><TD>" + anchor2 + "</TD><TD>" + anchor + str + "</TR>");
}
// Mark last line, may be targetted from Attributes window
file.println("<TR><TD> </A></TD></TR>");
file.println("</TABLE>");
}
}
/**
* Find all target addresses in code, so that they can be marked with <A NAME = ...>. Target
* addresses are kept in an BitSet object.
*/
private final void findGotos(ByteSequence bytes, Method method, Code code) throws IOException {
int index;
goto_set = new BitSet(bytes.available());
int opcode;
/* First get Code attribute from method and the exceptions handled
* (try .. catch) in this method. We only need the line number here.
*/
if (code != null) {
CodeException[] ce = code.getExceptionTable();
int len = ce.length;
for (int i = 0; i < len; i++) {
goto_set.set(ce[i].getStartPC());
goto_set.set(ce[i].getEndPC());
goto_set.set(ce[i].getHandlerPC());
}
// Look for local variables and their range
Attribute[] attributes = code.getAttributes();
for (int i = 0; i < attributes.length; i++) {
if (attributes[i].getTag() == ATTR_LOCAL_VARIABLE_TABLE) {
LocalVariable[] vars = ((LocalVariableTable) attributes[i]).getLocalVariableTable();
for (int j = 0; j < vars.length; j++) {
int start = vars[j].getStartPC();
int end = (int) (start + vars[j].getLength());
goto_set.set(start);
goto_set.set(end);
}
break;
}
}
}
// Get target addresses from GOTO, JSR, TABLESWITCH, etc.
for (int i = 0; bytes.available() > 0; i++) {
opcode = bytes.readUnsignedByte();
// System.out.println(OPCODE_NAMES[opcode]);
switch (opcode) {
case TABLESWITCH:
case LOOKUPSWITCH:
// bytes.readByte(); // Skip already read byte
int remainder = bytes.getIndex() % 4;
int no_pad_bytes = (remainder == 0) ? 0 : 4 - remainder;
int default_offset, offset;
for (int j = 0; j < no_pad_bytes; j++) {
bytes.readByte();
}
// Both cases have a field default_offset in common
default_offset = bytes.readInt();
if (opcode == TABLESWITCH) {
int low = bytes.readInt();
int high = bytes.readInt();
offset = bytes.getIndex() - 12 - no_pad_bytes - 1;
default_offset += offset;
goto_set.set(default_offset);
for (int j = 0; j < (high - low + 1); j++) {
index = offset + bytes.readInt();
goto_set.set(index);
}
} else { // LOOKUPSWITCH
int npairs = bytes.readInt();
offset = bytes.getIndex() - 8 - no_pad_bytes - 1;
default_offset += offset;
goto_set.set(default_offset);
for (int j = 0; j < npairs; j++) {
int match = bytes.readInt();
index = offset + bytes.readInt();
goto_set.set(index);
}
}
break;
case GOTO:
case IFEQ:
case IFGE:
case IFGT:
case IFLE:
case IFLT:
case IFNE:
case IFNONNULL:
case IFNULL:
case IF_ACMPEQ:
case IF_ACMPNE:
case IF_ICMPEQ:
case IF_ICMPGE:
case IF_ICMPGT:
case IF_ICMPLE:
case IF_ICMPLT:
case IF_ICMPNE:
case JSR:
// bytes.readByte(); // Skip already read byte
index = bytes.getIndex() + bytes.readShort() - 1;
goto_set.set(index);
break;
case GOTO_W:
case JSR_W:
// bytes.readByte(); // Skip already read byte
index = bytes.getIndex() + bytes.readInt() - 1;
goto_set.set(index);
break;
default:
bytes.unreadByte();
codeToHTML(bytes, 0); // Ignore output
}
}
}