package org.ibex.classgen;
import java.util.StringTokenizer;
+import java.util.Hashtable;
-public class Type {
- public static final Type VOID = new Type("V");
- public static final Type INT = new Type("I");
- public static final Type LONG = new Type("J");
- public static final Type BOOLEAN = new Type("Z");
- public static final Type DOUBLE = new Type("D");
- public static final Type FLOAT = new Type("F");
- public static final Type BYTE = new Type("B");
- public static final Type CHAR = new Type("C");
- public static final Type SHORT = new Type("S");
+public abstract class Type implements CGConst {
+
+ private static Hashtable instances = new Hashtable(); // this has to appear at the top of the file
+
+ // Public API //////////////////////////////////////////////////////////////////////////////
+
+ public static final Type VOID = new Primitive("V", "void");
+ public static final Type INT = new Primitive("I", "int");
+ public static final Type LONG = new Primitive("J", "long");
+ public static final Type BOOLEAN = new Primitive("Z", "boolean");
+ public static final Type DOUBLE = new Primitive("D", "double");
+ public static final Type FLOAT = new Primitive("F", "float");
+ public static final Type BYTE = new Primitive("B", "byte");
+ public static final Type CHAR = new Primitive("C", "char");
+ public static final Type SHORT = new Primitive("S", "short");
- public static final Type.Object OBJECT = new Type.Object("java.lang.Object");
- public static final Type.Object STRING = new Type.Object("java.lang.String");
- public static final Type.Object STRINGBUFFER = new Type.Object("java.lang.StringBuffer");
- public static final Type.Object INTEGER_OBJECT = new Type.Object("java.lang.Integer");
- public static final Type.Object DOUBLE_OBJECT = new Type.Object("java.lang.Double");
- public static final Type.Object FLOAT_OBJECT = new Type.Object("java.lang.Float");
+ public static final Type.Class OBJECT = Type.Class.instance("java.lang.Object");
+ public static final Type.Class STRING = Type.Class.instance("java.lang.String");
+ public static final Type.Class STRINGBUFFER = Type.Class.instance("java.lang.StringBuffer");
+ public static final Type.Class INTEGER_OBJECT = Type.Class.instance("java.lang.Integer");
+ public static final Type.Class DOUBLE_OBJECT = Type.Class.instance("java.lang.Double");
+ public static final Type.Class FLOAT_OBJECT = Type.Class.instance("java.lang.Float");
/** A zero element Type[] array (can be passed as the "args" param when a method takes no arguments */
public static final Type[] NO_ARGS = new Type[0];
- final String descriptor;
+ /**
+ * A "descriptor" is the classfile-mangled text representation of a type (see JLS section 4.3)
+ * guarantee: there will only be one instance of Type for a given descriptor ==> equals() and == are interchangeable
+ */
+ public static Type fromDescriptor(String d) {
+ Type ret = (Type)instances.get(d);
+ if (ret != null) return ret;
+ if (d.startsWith("[")) return new Type.Array(Type.fromDescriptor(d.substring(1)));
+ return new Type.Class(d);
+ }
+
+ public final String toString() { return super.toString(); }
+ public abstract String debugToString();
- Type(String descriptor) { this.descriptor = descriptor; }
+ public final String getDescriptor() { return descriptor; }
+
+ public Type.Array makeArray() { return (Type.Array)Type.fromDescriptor("["+descriptor); }
+ public Type.Array makeArray(int i) { return i==0 ? (Type.Array)this : makeArray().makeArray(i-1); }
+
+ public Type.Ref asRef() { throw new RuntimeException("attempted to use "+this+" as a Type.Ref, which it is not"); }
+ public Type.Class asClass() { throw new RuntimeException("attempted to use "+this+" as a Type.Class, which it is not"); }
+ public Type.Array asArray() { throw new RuntimeException("attempted to use "+this+" as a Type.Array, which it is not"); }
+ public boolean isPrimitive() { return false; }
+ public boolean isRef() { return false; }
+ public boolean isClass() { return false; }
+ public boolean isArray() { return false; }
+
+ // Protected/Private //////////////////////////////////////////////////////////////////////////////
+
+ protected final String descriptor;
- public static Type fromDescriptor(String descriptor) {
- if(descriptor.equals("V")) return VOID;
- if(descriptor.equals("I")) return INT;
- if(descriptor.equals("J")) return LONG;
- if(descriptor.equals("Z")) return BOOLEAN;
- if(descriptor.equals("D")) return DOUBLE;
- if(descriptor.equals("F")) return FLOAT;
- if(descriptor.equals("B")) return BYTE;
- if(descriptor.equals("C")) return CHAR;
- if(descriptor.equals("S")) return SHORT;
- if(Type.Object.validDescriptorString(descriptor)) return new Type.Object(descriptor);
- return null;
+ protected Type(String descriptor) {
+ this.descriptor = descriptor;
+ instances.put(descriptor, this);
}
-
- /** Returns the Java descriptor string for this object ("I", or "Ljava/lang/String", "[[J", etc */
- public final String getDescriptor() { return descriptor; }
- public int hashCode() { return descriptor.hashCode(); }
- public boolean equals(java.lang.Object o) { return o instanceof Type && ((Type)o).descriptor.equals(descriptor); }
-
- /** Returns a one dimensional array type for the base type <i>base</i>
- @param base The base type
- @return A one dimensional array of the base type
- */
- public static Type arrayType(Type base) { return arrayType(base,1); }
- /** Returns a <i>dim</i> dimensional array type for the base type <i>base</i>
- @param base The base type
- @param dim Number if dimensions
- @return A one dimensional array of the base type
- */
- public static Type arrayType(Type base, int dim) {
- StringBuffer sb = new StringBuffer(base.descriptor.length() + dim);
- for(int i=0;i<dim;i++) sb.append("[");
- sb.append(base.descriptor);
- return new Type(sb.toString());
+
+ public static class Primitive extends Type {
+ private String humanReadable;
+ Primitive(String descriptor, String humanReadable) {
+ super(descriptor);
+ this.humanReadable = humanReadable;
+ }
+ public String debugToString() { return humanReadable; }
+ public boolean isPrimitive() { return true; }
}
- /** Class representing Objec types (any non-primitive type) */
- public static class Object extends Type {
- /** Create an Type.Object instance for the specified string. <i>s</i> can be a string in the form
- "java.lang.String", "java/lang/String", or "Ljava/lang/String;".
- @param s The type */
- public Object(String s) { super(_initHelper(s)); }
-
+ public abstract static class Ref extends Type {
+ protected Ref(String descriptor) { super(descriptor); }
+ public abstract String debugToString();
+ public Type.Ref asRef() { return this; }
+ public boolean isRef() { return true; }
+ }
+
+ public static class Array extends Type.Ref {
+ public final Type base;
+ protected Array(Type t) { super("[" + t.getDescriptor()); base = t; }
+ public Type.Array asArray() { return this; }
+ public boolean isArray() { return true; }
+ public String debugToString() { return base.debugToString() + "[]"; }
+ public Type getElementType() { return Type.fromDescriptor(getDescriptor().substring(0, getDescriptor().length()-1)); }
+ }
+
+ public static class Class extends Type.Ref {
+ protected Class(String s) { super(_initHelper(s)); }
+ public Type.Class asClass() { return this; }
+ public boolean isClass() { return true; }
+ public static Type.Class instance(String className) {
+ return (Type.Class)Type.fromDescriptor("L"+className.replace('.', '/')+";"); }
+ //public boolean extendsOrImplements(Type.Class c, Context cx) { }
+ String internalForm() { return descriptor.substring(1, descriptor.length()-1); }
+ public String debugToString() { return internalForm().replace('/','.'); }
+ public String getShortName() {
+ int p = descriptor.lastIndexOf('/');
+ return p == -1 ? descriptor.substring(1,descriptor.length()-1) : descriptor.substring(p+1,descriptor.length()-1);
+ }
private static String _initHelper(String s) {
- if(!s.startsWith("L") || !s.endsWith(";")) s = "L" + s.replace('.','/') + ";";
- if(!validDescriptorString(s)) throw new IllegalArgumentException("invalid descriptor string");
+ if (!s.startsWith("L") || !s.endsWith(";")) s = "L" + s.replace('.', '/') + ";";
return s;
}
-
String[] components() {
- StringTokenizer st = new StringTokenizer(descriptor.substring(1,descriptor.length()-1),"/");
+ StringTokenizer st = new StringTokenizer(descriptor.substring(1, descriptor.length()-1), "/");
String[] a = new String[st.countTokens()];
for(int i=0;st.hasMoreTokens();i++) a[i] = st.nextToken();
return a;
}
-
- String internalForm() { return descriptor.substring(1,descriptor.length()-1); }
-
- static boolean validDescriptorString(String s) {
- return s.startsWith("L") && s.endsWith(";");
+
+ public Field field(String name, Type type) { return new Field(name, type); }
+ public abstract class Body extends HasFlags {
+ }
+
+ public Method method(String name, Type returnType, Type[] argTypes) { return new Method(name, returnType, argTypes); }
+ public Method method(String leftCrap, String rightCrap) { return method(leftCrap+rightCrap); }
+
+ /** see JVM Spec section 2.10.2 */
+ public Method method(String signature) {
+ // FEATURE: This parser is ugly but it works (and shouldn't be a problem) might want to clean it up though
+ String name = signature.substring(0, signature.indexOf('('));
+ String s = signature.substring(signature.indexOf('('));
+ if(!s.startsWith("(")) throw new IllegalArgumentException("invalid method type descriptor");
+ int p = s.indexOf(')');
+ if(p == -1) throw new IllegalArgumentException("invalid method type descriptor");
+ String argsDesc = s.substring(1,p);
+ String retDesc = s.substring(p+1);
+ Type[] argsBuf = new Type[argsDesc.length()];
+ int i;
+ for(i=0,p=0;argsDesc.length() > 0;i++,p=0) {
+ while(p < argsDesc.length() && argsDesc.charAt(p) == '[') p++;
+ if(p == argsDesc.length()) throw new IllegalArgumentException("invalid method type descriptor");
+ if(argsDesc.charAt(p) == 'L') {
+ p = argsDesc.indexOf(';');
+ if(p == -1) throw new IllegalArgumentException("invalid method type descriptor");
+ }
+ argsBuf[i] = Type.fromDescriptor(argsDesc.substring(0,p+1));
+ argsDesc = argsDesc.substring(p+1);
+ }
+ Type args[] = new Type[i];
+ System.arraycopy(argsBuf,0,args,0,i);
+ return method(name, Type.fromDescriptor(retDesc), args);
+ }
+
+ public abstract class Member {
+ public final String name;
+ private Member(String name) { this.name = name; }
+ public Type.Class getDeclaringClass() { return Type.Class.this; }
+ public String getName() { return name; }
+ public abstract String getTypeDescriptor();
+ public abstract String debugToString();
+ }
+
+ public class Field extends Member {
+ public final Type type;
+ private Field(String name, Type t) { super(name); this.type = t; }
+ public String getTypeDescriptor() { return type.getDescriptor(); }
+ public Type getType() { return type; }
+ public String debugToString() { return getDeclaringClass().debugToString()+"."+name+"["+type.debugToString()+"]"; }
+ public class Body extends HasFlags {
+ public final int flags;
+ public Body(int flags) {
+ if ((flags & ~VALID_FIELD_FLAGS) != 0) throw new IllegalArgumentException("invalid flags");
+ this.flags = flags;
+ }
+ public int getFlags() { return flags; }
+ public Field getField() { return Field.this; }
+ }
+ }
+
+ public class Method extends Member {
+ final Type[] argTypes;
+ public final Type returnType;
+ public Type getReturnType() { return returnType; }
+ public int getNumArgs() { return argTypes.length; }
+ public Type getArgType(int i) { return argTypes[i]; }
+ public Type[] getArgTypes() {
+ Type[] ret = new Type[argTypes.length];
+ System.arraycopy(argTypes, 0, ret, 0, ret.length);
+ return ret;
+ }
+ public boolean isConstructor() { return getName().equals("<init>"); }
+ public boolean isClassInitializer() { return getName().equals("<clinit>"); }
+ public String debugToString() {
+ StringBuffer sb = new StringBuffer();
+ if (name.equals("<clinit>")) sb.append("static ");
+ else {
+ if (name.equals("<init>"))
+ sb.append(Class.this.getShortName());
+ else
+ sb.append(returnType.debugToString()).append(".").append(name);
+ sb.append("(");
+ for(int i=0; i<argTypes.length; i++)
+ sb.append((i==0?"":", ")+argTypes[i].debugToString());
+ sb.append(") ");
+ }
+ return sb.toString();
+ }
+ private Method(String name, Type returnType, Type[] argTypes) {
+ super(name);
+ this.argTypes = argTypes;
+ this.returnType = returnType;
+ }
+ //public Method.Body getBody(Context cx) { }
+ public String getTypeDescriptor() {
+ StringBuffer sb = new StringBuffer(argTypes.length*4);
+ sb.append("(");
+ for(int i=0;i<argTypes.length;i++) sb.append(argTypes[i].getDescriptor());
+ sb.append(")");
+ sb.append(returnType.getDescriptor());
+ return sb.toString();
+ }
+ public abstract class Body extends HasFlags {
+ public abstract java.util.Hashtable getThrownExceptions();
+ public abstract void debugBodyToString(StringBuffer sb);
+ public void debugToString(StringBuffer sb, String constructorName) {
+ int flags = getFlags();
+ sb.append(" ").append(ClassFile.flagsToString(flags,false));
+ sb.append(Method.this.debugToString());
+ java.util.Hashtable thrownExceptions = getThrownExceptions();
+ if (thrownExceptions.size() > 0) {
+ sb.append("throws");
+ for(java.util.Enumeration e = thrownExceptions.keys();e.hasMoreElements();)
+ sb.append(" ").append(((Type.Class)e.nextElement()).debugToString()).append(",");
+ sb.setLength(sb.length()-1);
+ sb.append(" ");
+ }
+ if ((flags & (NATIVE|ABSTRACT))==0) {
+ sb.append("{\n");
+ debugBodyToString(sb);
+ sb.append(" }\n");
+ } else {
+ sb.append(";");
+ }
+ }
+ }
}
- }
+ }
+
+ // FEATURE: This probably isn't the best place for these
+ static String methodTypeDescriptor(Type[] argTypes, Type returnType) {
+ StringBuffer sb = new StringBuffer(argTypes.length*4);
+ sb.append("(");
+ for(int i=0;i<argTypes.length;i++) sb.append(argTypes[i].getDescriptor());
+ sb.append(")");
+ sb.append(returnType.getDescriptor());
+ return sb.toString();
+ }
+
}
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