in src/main/java/org/apache/bcel/util/CodeHTML.java [78:366]
private String codeToHTML(final ByteSequence bytes, final int methodNumber) throws IOException {
final short opcode = (short) bytes.readUnsignedByte();
String name;
final String signature;
int defaultOffset = 0;
final int low;
final int high;
int index;
final int classIndex;
final int vindex;
final int constant;
final int[] jumpTable;
int noPadBytes = 0;
final int offset;
final StringBuilder buf = new StringBuilder(256); // CHECKSTYLE IGNORE MagicNumber
buf.append("<TT>").append(Const.getOpcodeName(opcode)).append("</TT></TD><TD>");
/*
* Special case: Skip (0-3) padding bytes, i.e., the following bytes are 4-byte-aligned
*/
if (opcode == Const.TABLESWITCH || opcode == Const.LOOKUPSWITCH) {
final int remainder = bytes.getIndex() % 4;
noPadBytes = remainder == 0 ? 0 : 4 - remainder;
for (int i = 0; i < noPadBytes; i++) {
bytes.readByte();
}
// Both cases have a field default_offset in common
defaultOffset = bytes.readInt();
}
switch (opcode) {
case Const.TABLESWITCH:
low = bytes.readInt();
high = bytes.readInt();
offset = bytes.getIndex() - 12 - noPadBytes - 1;
defaultOffset += offset;
buf.append("<TABLE BORDER=1><TR>");
// Print switch indices in first row (and default)
jumpTable = new int[high - low + 1];
for (int i = 0; i < jumpTable.length; i++) {
jumpTable[i] = offset + bytes.readInt();
buf.append("<TH>").append(low + i).append("</TH>");
}
buf.append("<TH>default</TH></TR>\n<TR>");
// Print target and default indices in second row
for (final int element : jumpTable) {
buf.append("<TD><A HREF=\"#code").append(methodNumber).append("@").append(element).append("\">").append(element).append("</A></TD>");
}
buf.append("<TD><A HREF=\"#code").append(methodNumber).append("@").append(defaultOffset).append("\">").append(defaultOffset)
.append("</A></TD></TR>\n</TABLE>\n");
break;
/*
* Lookup switch has variable length arguments.
*/
case Const.LOOKUPSWITCH:
final int npairs = bytes.readInt();
offset = bytes.getIndex() - 8 - noPadBytes - 1;
jumpTable = new int[npairs];
defaultOffset += offset;
buf.append("<TABLE BORDER=1><TR>");
// Print switch indices in first row (and default)
for (int i = 0; i < npairs; i++) {
final int match = bytes.readInt();
jumpTable[i] = offset + bytes.readInt();
buf.append("<TH>").append(match).append("</TH>");
}
buf.append("<TH>default</TH></TR>\n<TR>");
// Print target and default indices in second row
for (int i = 0; i < npairs; i++) {
buf.append("<TD><A HREF=\"#code").append(methodNumber).append("@").append(jumpTable[i]).append("\">").append(jumpTable[i])
.append("</A></TD>");
}
buf.append("<TD><A HREF=\"#code").append(methodNumber).append("@").append(defaultOffset).append("\">").append(defaultOffset)
.append("</A></TD></TR>\n</TABLE>\n");
break;
/*
* Two address bytes + offset from start of byte stream form the jump target.
*/
case Const.GOTO:
case Const.IFEQ:
case Const.IFGE:
case Const.IFGT:
case Const.IFLE:
case Const.IFLT:
case Const.IFNE:
case Const.IFNONNULL:
case Const.IFNULL:
case Const.IF_ACMPEQ:
case Const.IF_ACMPNE:
case Const.IF_ICMPEQ:
case Const.IF_ICMPGE:
case Const.IF_ICMPGT:
case Const.IF_ICMPLE:
case Const.IF_ICMPLT:
case Const.IF_ICMPNE:
case Const.JSR:
index = bytes.getIndex() + bytes.readShort() - 1;
buf.append("<A HREF=\"#code").append(methodNumber).append("@").append(index).append("\">").append(index).append("</A>");
break;
/*
* Same for 32-bit wide jumps
*/
case Const.GOTO_W:
case Const.JSR_W:
final int windex = bytes.getIndex() + bytes.readInt() - 1;
buf.append("<A HREF=\"#code").append(methodNumber).append("@").append(windex).append("\">").append(windex).append("</A>");
break;
/*
* Index byte references local variable (register)
*/
case Const.ALOAD:
case Const.ASTORE:
case Const.DLOAD:
case Const.DSTORE:
case Const.FLOAD:
case Const.FSTORE:
case Const.ILOAD:
case Const.ISTORE:
case Const.LLOAD:
case Const.LSTORE:
case Const.RET:
if (wide) {
vindex = bytes.readShort();
wide = false; // Clear flag
} else {
vindex = bytes.readUnsignedByte();
}
buf.append("%").append(vindex);
break;
/*
* Remember wide byte which is used to form a 16-bit address in the following instruction. Relies on that the method is
* called again with the following opcode.
*/
case Const.WIDE:
wide = true;
buf.append("(wide)");
break;
/*
* Array of basic type.
*/
case Const.NEWARRAY:
buf.append("<FONT COLOR=\"#00FF00\">").append(Const.getTypeName(bytes.readByte())).append("</FONT>");
break;
/*
* Access object/class fields.
*/
case Const.GETFIELD:
case Const.GETSTATIC:
case Const.PUTFIELD:
case Const.PUTSTATIC:
index = bytes.readShort();
final ConstantFieldref c1 = constantPool.getConstant(index, Const.CONSTANT_Fieldref, ConstantFieldref.class);
classIndex = c1.getClassIndex();
name = constantPool.getConstantString(classIndex, Const.CONSTANT_Class);
name = Utility.compactClassName(name, false);
index = c1.getNameAndTypeIndex();
final String fieldName = constantPool.constantToString(index, Const.CONSTANT_NameAndType);
if (name.equals(className)) { // Local field
buf.append("<A HREF=\"").append(className).append("_methods.html#field").append(fieldName).append("\" TARGET=Methods>").append(fieldName)
.append("</A>\n");
} else {
buf.append(constantHtml.referenceConstant(classIndex)).append(".").append(fieldName);
}
break;
/*
* Operands are references to classes in constant pool
*/
case Const.CHECKCAST:
case Const.INSTANCEOF:
case Const.NEW:
index = bytes.readShort();
buf.append(constantHtml.referenceConstant(index));
break;
/*
* Operands are references to methods in constant pool
*/
case Const.INVOKESPECIAL:
case Const.INVOKESTATIC:
case Const.INVOKEVIRTUAL:
case Const.INVOKEINTERFACE:
case Const.INVOKEDYNAMIC:
final int mIndex = bytes.readShort();
final String str;
if (opcode == Const.INVOKEINTERFACE) { // Special treatment needed
bytes.readUnsignedByte(); // Redundant
bytes.readUnsignedByte(); // Reserved
// int nargs = bytes.readUnsignedByte(); // Redundant
// int reserved = bytes.readUnsignedByte(); // Reserved
final ConstantInterfaceMethodref c = constantPool.getConstant(mIndex, Const.CONSTANT_InterfaceMethodref, ConstantInterfaceMethodref.class);
classIndex = c.getClassIndex();
index = c.getNameAndTypeIndex();
name = Class2HTML.referenceClass(classIndex);
} else if (opcode == Const.INVOKEDYNAMIC) { // Special treatment needed
bytes.readUnsignedByte(); // Reserved
bytes.readUnsignedByte(); // Reserved
final ConstantInvokeDynamic c = constantPool.getConstant(mIndex, Const.CONSTANT_InvokeDynamic, ConstantInvokeDynamic.class);
index = c.getNameAndTypeIndex();
name = "#" + c.getBootstrapMethodAttrIndex();
} else {
// UNDONE: Java8 now allows INVOKESPECIAL and INVOKESTATIC to
// reference EITHER a Methodref OR an InterfaceMethodref.
// Not sure if that affects this code or not. (markro)
final ConstantMethodref c = constantPool.getConstant(mIndex, Const.CONSTANT_Methodref, ConstantMethodref.class);
classIndex = c.getClassIndex();
index = c.getNameAndTypeIndex();
name = Class2HTML.referenceClass(classIndex);
}
str = Class2HTML.toHTML(constantPool.constantToString(constantPool.getConstant(index, Const.CONSTANT_NameAndType)));
// Get signature, i.e., types
final ConstantNameAndType c2 = constantPool.getConstant(index, Const.CONSTANT_NameAndType, ConstantNameAndType.class);
signature = constantPool.constantToString(c2.getSignatureIndex(), Const.CONSTANT_Utf8);
final String[] args = Utility.methodSignatureArgumentTypes(signature, false);
final String type = Utility.methodSignatureReturnType(signature, false);
buf.append(name).append(".<A HREF=\"").append(className).append("_cp.html#cp").append(mIndex).append("\" TARGET=ConstantPool>").append(str)
.append("</A>").append("(");
// List arguments
for (int i = 0; i < args.length; i++) {
buf.append(Class2HTML.referenceType(args[i]));
if (i < args.length - 1) {
buf.append(", ");
}
}
// Attach return type
buf.append("):").append(Class2HTML.referenceType(type));
break;
/*
* Operands are references to items in constant pool
*/
case Const.LDC_W:
case Const.LDC2_W:
index = bytes.readShort();
buf.append("<A HREF=\"").append(className).append("_cp.html#cp").append(index).append("\" TARGET=\"ConstantPool\">")
.append(Class2HTML.toHTML(constantPool.constantToString(index, constantPool.getConstant(index).getTag()))).append("</a>");
break;
case Const.LDC:
index = bytes.readUnsignedByte();
buf.append("<A HREF=\"").append(className).append("_cp.html#cp").append(index).append("\" TARGET=\"ConstantPool\">")
.append(Class2HTML.toHTML(constantPool.constantToString(index, constantPool.getConstant(index).getTag()))).append("</a>");
break;
/*
* Array of references.
*/
case Const.ANEWARRAY:
index = bytes.readShort();
buf.append(constantHtml.referenceConstant(index));
break;
/*
* Multidimensional array of references.
*/
case Const.MULTIANEWARRAY:
index = bytes.readShort();
final int dimensions = bytes.readByte();
buf.append(constantHtml.referenceConstant(index)).append(":").append(dimensions).append("-dimensional");
break;
/*
* Increment local variable.
*/
case Const.IINC:
if (wide) {
vindex = bytes.readShort();
constant = bytes.readShort();
wide = false;
} else {
vindex = bytes.readUnsignedByte();
constant = bytes.readByte();
}
buf.append("%").append(vindex).append(" ").append(constant);
break;
default:
if (Const.getNoOfOperands(opcode) > 0) {
for (int i = 0; i < Const.getOperandTypeCount(opcode); i++) {
switch (Const.getOperandType(opcode, i)) {
case Const.T_BYTE:
buf.append(bytes.readUnsignedByte());
break;
case Const.T_SHORT: // Either branch or index
buf.append(bytes.readShort());
break;
case Const.T_INT:
buf.append(bytes.readInt());
break;
default: // Never reached
throw new IllegalStateException("Unreachable default case reached! " + Const.getOperandType(opcode, i));
}
buf.append(" ");
}
}
}
buf.append("</TD>");
return buf.toString();
}