/**
* Constructor.
*
* @param code The {@link Code} attribute being decompiled.
*/
public Frame(Code code) {
operandStack = new Stack<String>();
localVars = new LocalVarInfo[code.getMaxLocals()];
int i = 0;
MethodInfo mi = code.getMethodInfo();
// Instance methods have an implicit first parameter of "this".
if (!mi.isStatic()) {
localVars[i++] = new LocalVarInfo("this", true);
}
// Name the passed-in local vars by their types. longs and doubles
// take up two slots.
String[] paramTypes = mi.getParameterTypes();
for (int param_i = 0; param_i < paramTypes.length; param_i++) {
String type = paramTypes[param_i];
if (type.indexOf('.') > -1) { // Class types.
type = type.substring(type.lastIndexOf('.') + 1);
}
String name = "localVar_" + type + "_" + param_i;
localVars[i] = new LocalVarInfo(name, true);
i++;
if ("long".equals(type) || "double".equals(type)) {
i++; // longs and doubles take up two slots.
}
}
// NOTE: Other local vars will still be "null" here! We need to
// infer their types from their usage during disassembly/decompilation.
System.out.println("NOTE: " + (localVars.length - i) + " unknown localVars slots");
}
/**
* Reads a <code>MethodInfo</code> from an input stream.
*
* @param cf The class file defining the method.
* @param in The input stream to read from.
* @return The method information read.
* @throws IOException If an IO error occurs.
*/
public static MethodInfo read(ClassFile cf, DataInputStream in) throws IOException {
int accessFlags = in.readUnsignedShort();
int nameIndex = in.readUnsignedShort();
int descriptorIndex = in.readUnsignedShort();
MethodInfo mi = new MethodInfo(cf, accessFlags, nameIndex, descriptorIndex);
int attrCount = in.readUnsignedShort();
for (int j = 0; j < attrCount; j++) {
AttributeInfo ai = mi.readAttribute(in);
if (ai instanceof Signature) {
mi.signatureAttr = (Signature) ai;
} else if (ai instanceof Code) {
mi.codeAttr = (Code) ai;
} else if (ai != null) {
mi.addAttribute(ai);
}
}
return mi;
}
