import java.util.StringTokenizer;
import java.util.Hashtable;
-public class Type {
+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 Type("V", "void");
- public static final Type INT = new Type("I", "int");
- public static final Type LONG = new Type("J", "long");
- public static final Type BOOLEAN = new Type("Z", "boolean");
- public static final Type DOUBLE = new Type("D", "double");
- public static final Type FLOAT = new Type("F", "float");
- public static final Type BYTE = new Type("B", "byte");
- public static final Type CHAR = new Type("C", "char");
- public static final Type SHORT = new Type("S", "short");
+ 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 NULL = new Null();
- public static final Type.Class OBJECT = new Type.Class("java.lang.Object");
- public static final Type.Class STRING = new Type.Class("java.lang.String");
- public static final Type.Class STRINGBUFFER = new Type.Class("java.lang.StringBuffer");
- public static final Type.Class INTEGER_OBJECT = new Type.Class("java.lang.Integer");
- public static final Type.Class DOUBLE_OBJECT = new Type.Class("java.lang.Double");
- public static final Type.Class FLOAT_OBJECT = new Type.Class("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];
- /** guarantee: there will only be one instance of Type for a given descriptor ==> equals() and == are interchangeable */
- public static Type instance(String d) {
+ /**
+ * 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(instance(d.substring(1)));
+ if (d.startsWith("[")) return new Type.Array(Type.fromDescriptor(d.substring(1)));
return new Type.Class(d);
}
- public String toString() { return toString; }
public final String getDescriptor() { return descriptor; }
- public int hashCode() { return descriptor.hashCode(); }
- public boolean equals(java.lang.Object o) { return this==o; }
- public Type.Array makeArray() { return (Type.Array)instance("["+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 !isRef(); }
+ public boolean isPrimitive() { return false; }
public boolean isRef() { return false; }
public boolean isClass() { return false; }
public boolean isArray() { return false; }
+ public static Type unify(Type t1, Type t2) {
+ if(t1 == Type.NULL) return t2;
+ if(t2 == Type.NULL) return t1;
+ if((t1 == Type.INT && t2 == Type.BOOLEAN) || (t2 == Type.INT & t1 == Type.BOOLEAN)) return Type.BOOLEAN;
+ if(t1 == t2) return t1;
+ // FIXME: This needs to do a lot more (subclasses, etc)
+ // it probably should be in Context.java
+ return null;
+ }
+
+ public static Type fromArraySpec(int i) {
+ switch(i) {
+ case 4: return Type.BOOLEAN;
+ case 5: return Type.CHAR;
+ case 6: return Type.FLOAT;
+ case 7: return Type.DOUBLE;
+ case 8: return Type.BYTE;
+ case 9: return Type.SHORT;
+ case 10: return Type.INT;
+ case 11: return Type.LONG;
+ default: throw new IllegalStateException("invalid array type");
+ }
+ }
+
// Protected/Private //////////////////////////////////////////////////////////////////////////////
protected final String descriptor;
- protected final String toString;
- protected Type(String descriptor) { this(descriptor, descriptor); }
- protected Type(String descriptor, String humanReadable) {
- this.toString = humanReadable;
- instances.put(this.descriptor = descriptor, this);
+
+ protected Type(String descriptor) {
+ this.descriptor = descriptor;
+ instances.put(descriptor, this);
+ }
+
+ public static class Null extends Type {
+ protected Null() { super(""); } // not really correct....
}
- public static class Ref extends Type {
+ public static class Primitive extends Type {
+ private String humanReadable;
+ Primitive(String descriptor, String humanReadable) {
+ super(descriptor);
+ this.humanReadable = humanReadable;
+ }
+ public String toString() { return humanReadable; }
+ public boolean isPrimitive() { return true; }
+ }
+
+ public abstract static class Ref extends Type {
protected Ref(String descriptor) { super(descriptor); }
- protected Ref(String descriptor, String humanReadable) { super(descriptor, humanReadable); }
+ public abstract String toString();
public Type.Ref asRef() { return this; }
public boolean isRef() { return true; }
}
public static class Array extends Type.Ref {
- protected Array(Type t) { super("[" + t.getDescriptor(), t.toString() + "[]"); }
+ 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 int dimension() { return getDescriptor().lastIndexOf('['); }
+ public String toString() { return base.toString() + "[]"; }
+ public Type getElementType() { return base; }
}
public static class Class extends Type.Ref {
- protected Class(String s) { super(_initHelper(s), _initHelper2(s)); }
+ protected Class(String s) { super(_initHelper(s)); }
public Type.Class asClass() { return this; }
public boolean isClass() { return true; }
- public String getShortName() { return toString.substring(toString.lastIndexOf('.')+1); }
+ public static Type.Class instance(String className) {
+ return (Type.Class)Type.fromDescriptor("L"+className.replace('.', '/')+";"); }
+ public boolean extendsOrImplements(Type.Class c, Context cx) {
+ if (this==c) return true;
+ if (this==OBJECT) return false;
+ ClassFile cf = cx.resolve(getName());
+ if (cf==null) {
+ System.err.println("warning: could not resolve class " + getName());
+ return false;
+ }
+ if (cf.superType == c) return true;
+ for(int i=0; i<cf.interfaces.length; i++) if (cf.interfaces[i].extendsOrImplements(c,cx)) return true;
+ if (cf.superType == null) return false;
+ return cf.superType.extendsOrImplements(c, cx);
+ }
String internalForm() { return descriptor.substring(1, descriptor.length()-1); }
+ public String toString() { return internalForm().replace('/','.'); }
+ public String getName() { 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 (!s.startsWith("L") || !s.endsWith(";")) throw new Error("invalid: " + s);
return s;
}
- private static String _initHelper2(String s) {
- if (s.startsWith("L") && s.endsWith(";")) s = s.substring(1, s.length()-1);
- return s.replace('/', '.');
- }
String[] components() {
StringTokenizer st = new StringTokenizer(descriptor.substring(1, descriptor.length()-1), "/");
String[] a = new String[st.countTokens()];
return a;
}
+ public Type.Class.Body getBody(Context cx) { return cx.resolve(this.getName()); }
+ public abstract class Body extends HasAttributes {
+ public abstract Type.Class.Method.Body[] methods();
+ public abstract Type.Class.Field.Body[] fields();
+ public Body(int flags, ClassFile.AttrGen attrs) {
+ super(flags, attrs);
+ if ((flags & ~(PUBLIC|FINAL|SUPER|INTERFACE|ABSTRACT)) != 0)
+ throw new IllegalArgumentException("invalid flags: " + Integer.toString(flags,16));
+ }
+ }
+
+ public Field field(String name, Type type) { return new Field(name, type); }
+ public Field field(String name, String descriptor) { return field(name,Type.fromDescriptor(descriptor)); }
+
public Method method(String name, Type returnType, Type[] argTypes) { return new Method(name, returnType, argTypes); }
- public Field field(String name, Type type) { return new Field(name, type); }
+
+ /** see JVM Spec section 2.10.2 */
+ public Method method(String name, String descriptor) {
+ // FEATURE: This parser is ugly but it works (and shouldn't be a problem) might want to clean it up though
+ String s = descriptor;
+ 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 abstract String getDescriptor();
- public boolean equals(Object o_) {
- if(!(o_ instanceof Member)) return false;
- Member o = (Member) o_;
- return o.getDeclaringClass().equals(getDeclaringClass()) &&
- o.name.equals(name) &&
- o.getDescriptor().equals(getDescriptor());
- }
- public int hashCode() { return getDeclaringClass().hashCode() ^ name.hashCode() ^ getDescriptor().hashCode(); }
+ public String getName() { return name; }
+ public abstract String getTypeDescriptor();
+ public abstract String toString();
+ public abstract int hashCode();
+ public abstract boolean equals(Object o);
}
public class Field extends Member {
public final Type type;
private Field(String name, Type t) { super(name); this.type = t; }
- public String getDescriptor() { return name; }
+ public String getTypeDescriptor() { return type.getDescriptor(); }
+ public Type getType() { return type; }
+ public String toString() { return getDeclaringClass().toString()+"."+name+"["+type.toString()+"]"; }
+ public class Body extends HasAttributes {
+ public Field getField() { return Field.this; }
+ public Body(int flags, ClassFile.AttrGen attrs) {
+ super(flags, attrs);
+ if ((flags & ~VALID_FIELD_FLAGS) != 0) throw new IllegalArgumentException("invalid flags");
+ }
+ }
+ public int hashCode() {
+ return type.hashCode() ^ name.hashCode() ^ getDeclaringClass().hashCode();
+ }
+ public boolean equals(Object o_) {
+ if(o_ == this) return true;
+ if(!(o_ instanceof Field)) return false;
+ Field o = (Field) o_;
+ return o.getDeclaringClass() == getDeclaringClass() && o.type == type && o.name.equals(name);
+ }
}
public class Method extends Member {
final Type[] argTypes;
- final Type returnType;
+ 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 toString() {
+ 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.toString()).append(" ").append(name);
+ sb.append("(");
+ for(int i=0; i<argTypes.length; i++)
+ sb.append((i==0?"":", ")+argTypes[i].toString());
+ sb.append(") ");
+ }
+ return sb.toString();
+ }
private Method(String name, Type returnType, Type[] argTypes) {
super(name);
this.argTypes = argTypes;
this.returnType = returnType;
}
- public String getDescriptor() {
+ //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(returnType.getDescriptor());
return sb.toString();
}
+ public abstract class Body extends HasAttributes {
+ public abstract java.util.Hashtable getThrownExceptions();
+ public abstract void debugBodyToString(StringBuffer sb);
+ public Method getMethod() { return Method.this; }
+ public Body(int flags, ClassFile.AttrGen attrs) {
+ super(flags, attrs);
+ if ((flags & ~VALID_METHOD_FLAGS) != 0) throw new IllegalArgumentException("invalid flags");
+ }
+ public boolean isConcrete() { return !isAbstract() && !isNative() /*FIXME: !inAnInterface*/; }
+ public void toString(StringBuffer sb, String constructorName) {
+ int flags = getFlags();
+ sb.append(" ").append(ClassFile.flagsToString(flags,false));
+ sb.append(Method.this.toString());
+ 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()).toString()).append(",");
+ sb.setLength(sb.length()-1);
+ sb.append(" ");
+ }
+ if ((flags & (NATIVE|ABSTRACT))==0) {
+ sb.append("{\n");
+ debugBodyToString(sb);
+ sb.append(" }\n");
+ } else {
+ sb.append(";");
+ }
+ }
+ }
+ public int hashCode() {
+ int h = returnType.hashCode() ^ name.hashCode() ^ getDeclaringClass().hashCode();
+ for(int i=0;i<argTypes.length;i++) h ^= argTypes[i].hashCode();
+ return h;
+ }
+ public boolean equals(Object o_) {
+ if(o_ == this) return true;
+ if(!(o_ instanceof Method)) return false;
+ Method o = (Method) o_;
+ if(!(o.getDeclaringClass() == getDeclaringClass() && o.returnType == returnType && o.name.equals(name))) return false;
+ if(o.argTypes.length != argTypes.length) return false;
+ for(int i=0;i<argTypes.length;i++)
+ if(o.argTypes[i] != argTypes[i]) return false;
+ return true;
+ }
}
+ }
+
+ // 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();
+ }
- }
}
projects / org.ibex.classgen.git / blobdiff