1 package org.ibex.classgen;
3 import java.util.StringTokenizer;
4 import java.util.Hashtable;
6 public abstract class Type implements CGConst {
8 private static Hashtable instances = new Hashtable(); // this has to appear at the top of the file
10 // Public API //////////////////////////////////////////////////////////////////////////////
12 public static final Type VOID = new Primitive("V", "void");
13 public static final Type INT = new Primitive("I", "int");
14 public static final Type LONG = new Primitive("J", "long");
15 public static final Type BOOLEAN = new Primitive("Z", "boolean");
16 public static final Type DOUBLE = new Primitive("D", "double");
17 public static final Type FLOAT = new Primitive("F", "float");
18 public static final Type BYTE = new Primitive("B", "byte");
19 public static final Type CHAR = new Primitive("C", "char");
20 public static final Type SHORT = new Primitive("S", "short");
21 public static final Type NULL = new Null();
23 public static final Type.Class OBJECT = Type.Class.instance("java.lang.Object");
24 public static final Type.Class STRING = Type.Class.instance("java.lang.String");
25 public static final Type.Class STRINGBUFFER = Type.Class.instance("java.lang.StringBuffer");
26 public static final Type.Class INTEGER_OBJECT = Type.Class.instance("java.lang.Integer");
27 public static final Type.Class DOUBLE_OBJECT = Type.Class.instance("java.lang.Double");
28 public static final Type.Class FLOAT_OBJECT = Type.Class.instance("java.lang.Float");
30 /** A zero element Type[] array (can be passed as the "args" param when a method takes no arguments */
31 public static final Type[] NO_ARGS = new Type[0];
34 * A "descriptor" is the classfile-mangled text representation of a type (see JLS section 4.3)
35 * guarantee: there will only be one instance of Type for a given descriptor ==> equals() and == are interchangeable
37 public static Type fromDescriptor(String d) {
38 Type ret = (Type)instances.get(d);
39 if (ret != null) return ret;
40 if (d.startsWith("[")) return new Type.Array(Type.fromDescriptor(d.substring(1)));
41 return new Type.Class(d);
44 public final String getDescriptor() { return descriptor; }
46 public Type.Array makeArray() { return (Type.Array)Type.fromDescriptor("["+descriptor); }
47 public Type.Array makeArray(int i) { return i==0 ? (Type.Array)this : makeArray().makeArray(i-1); }
49 public Type.Ref asRef() { throw new RuntimeException("attempted to use "+this+" as a Type.Ref, which it is not"); }
50 public Type.Class asClass() { throw new RuntimeException("attempted to use "+this+" as a Type.Class, which it is not"); }
51 public Type.Array asArray() { throw new RuntimeException("attempted to use "+this+" as a Type.Array, which it is not"); }
52 public boolean isPrimitive() { return false; }
53 public boolean isRef() { return false; }
54 public boolean isClass() { return false; }
55 public boolean isArray() { return false; }
57 public static Type unify(Type t1, Type t2) {
58 if(t1 == Type.NULL) return t2;
59 if(t2 == Type.NULL) return t1;
60 if((t1 == Type.INT && t2 == Type.BOOLEAN) || (t2 == Type.INT & t1 == Type.BOOLEAN)) return Type.BOOLEAN;
61 if(t1 == t2) return t1;
62 // FIXME: This needs to do a lot more (subclasses, etc)
63 // it probably should be in Context.java
67 public static Type fromArraySpec(int i) {
69 case 4: return Type.BOOLEAN;
70 case 5: return Type.CHAR;
71 case 6: return Type.FLOAT;
72 case 7: return Type.DOUBLE;
73 case 8: return Type.BYTE;
74 case 9: return Type.SHORT;
75 case 10: return Type.INT;
76 case 11: return Type.LONG;
77 default: throw new IllegalStateException("invalid array type");
81 // Protected/Private //////////////////////////////////////////////////////////////////////////////
83 protected final String descriptor;
85 protected Type(String descriptor) {
86 this.descriptor = descriptor;
87 instances.put(descriptor, this);
90 public static class Null extends Type {
91 protected Null() { super(""); } // not really correct....
94 public static class Primitive extends Type {
95 private String humanReadable;
96 Primitive(String descriptor, String humanReadable) {
98 this.humanReadable = humanReadable;
100 public String toString() { return humanReadable; }
101 public boolean isPrimitive() { return true; }
104 public abstract static class Ref extends Type {
105 protected Ref(String descriptor) { super(descriptor); }
106 public abstract String toString();
107 public Type.Ref asRef() { return this; }
108 public boolean isRef() { return true; }
109 abstract String internalForm();
112 public static class Array extends Type.Ref {
113 public final Type base;
114 protected Array(Type t) { super("[" + t.getDescriptor()); base = t; }
115 public Type.Array asArray() { return this; }
116 public boolean isArray() { return true; }
117 public String toString() { return base.toString() + "[]"; }
118 public Type getElementType() { return base; }
119 String internalForm() { return getDescriptor(); }
122 public static class Class extends Type.Ref {
123 protected Class(String s) { super(_initHelper(s)); }
124 public Type.Class asClass() { return this; }
125 public boolean isClass() { return true; }
126 public static Type.Class instance(String className) {
127 return (Type.Class)Type.fromDescriptor("L"+className.replace('.', '/')+";"); }
128 public boolean extendsOrImplements(Type.Class c, Context cx) {
129 if (this==c) return true;
130 if (this==OBJECT) return false;
131 ClassFile cf = cx.resolve(getName());
133 System.err.println("warning: could not resolve class " + getName());
136 if (cf.superType == c) return true;
137 for(int i=0; i<cf.interfaces.length; i++) if (cf.interfaces[i].extendsOrImplements(c,cx)) return true;
138 if (cf.superType == null) return false;
139 return cf.superType.extendsOrImplements(c, cx);
141 String internalForm() { return descriptor.substring(1, descriptor.length()-1); }
142 public String toString() { return internalForm().replace('/','.'); }
143 public String getName() { return internalForm().replace('/','.'); }
144 public String getShortName() {
145 int p = descriptor.lastIndexOf('/');
146 return p == -1 ? descriptor.substring(1,descriptor.length()-1) : descriptor.substring(p+1,descriptor.length()-1);
148 private static String _initHelper(String s) {
149 if (!s.startsWith("L") || !s.endsWith(";")) throw new Error("invalid: " + s);
152 String[] components() {
153 StringTokenizer st = new StringTokenizer(descriptor.substring(1, descriptor.length()-1), "/");
154 String[] a = new String[st.countTokens()];
155 for(int i=0;st.hasMoreTokens();i++) a[i] = st.nextToken();
159 public Type.Class.Body getBody(Context cx) { return cx.resolve(this.getName()); }
160 public abstract class Body extends HasAttributes {
161 public abstract Type.Class.Method.Body[] methods();
162 public abstract Type.Class.Field.Body[] fields();
163 public Body(int flags, ClassFile.AttrGen attrs) {
165 if ((flags & ~(PUBLIC|FINAL|SUPER|INTERFACE|ABSTRACT)) != 0)
166 throw new IllegalArgumentException("invalid flags: " + Integer.toString(flags,16));
170 public Field field(String name, Type type) { return new Field(name, type); }
171 public Field field(String name, String descriptor) { return field(name,Type.fromDescriptor(descriptor)); }
173 public Method method(String name, Type returnType, Type[] argTypes) { return new Method(name, returnType, argTypes); }
175 /** see JVM Spec section 2.10.2 */
176 public Method method(String name, String descriptor) {
177 // FEATURE: This parser is ugly but it works (and shouldn't be a problem) might want to clean it up though
178 String s = descriptor;
179 if(!s.startsWith("(")) throw new IllegalArgumentException("invalid method type descriptor");
180 int p = s.indexOf(')');
181 if(p == -1) throw new IllegalArgumentException("invalid method type descriptor");
182 String argsDesc = s.substring(1,p);
183 String retDesc = s.substring(p+1);
184 Type[] argsBuf = new Type[argsDesc.length()];
186 for(i=0,p=0;argsDesc.length() > 0;i++,p=0) {
187 while(p < argsDesc.length() && argsDesc.charAt(p) == '[') p++;
188 if(p == argsDesc.length()) throw new IllegalArgumentException("invalid method type descriptor");
189 if(argsDesc.charAt(p) == 'L') {
190 p = argsDesc.indexOf(';');
191 if(p == -1) throw new IllegalArgumentException("invalid method type descriptor");
193 argsBuf[i] = Type.fromDescriptor(argsDesc.substring(0,p+1));
194 argsDesc = argsDesc.substring(p+1);
196 Type args[] = new Type[i];
197 System.arraycopy(argsBuf,0,args,0,i);
198 return method(name, Type.fromDescriptor(retDesc), args);
201 public abstract class Member {
202 public final String name;
203 private Member(String name) { this.name = name; }
204 public Type.Class getDeclaringClass() { return Type.Class.this; }
205 public String getName() { return name; }
206 public abstract String getTypeDescriptor();
207 public abstract String toString();
208 public abstract int hashCode();
209 public abstract boolean equals(Object o);
212 public class Field extends Member {
213 public final Type type;
214 private Field(String name, Type t) { super(name); this.type = t; }
215 public String getTypeDescriptor() { return type.getDescriptor(); }
216 public Type getType() { return type; }
217 public String toString() { return getDeclaringClass().toString()+"."+name+"["+type.toString()+"]"; }
218 public class Body extends HasAttributes {
219 public Field getField() { return Field.this; }
220 public Body(int flags, ClassFile.AttrGen attrs) {
222 if ((flags & ~VALID_FIELD_FLAGS) != 0) throw new IllegalArgumentException("invalid flags");
225 public int hashCode() {
226 return type.hashCode() ^ name.hashCode() ^ getDeclaringClass().hashCode();
228 public boolean equals(Object o_) {
229 if(o_ == this) return true;
230 if(!(o_ instanceof Field)) return false;
231 Field o = (Field) o_;
232 return o.getDeclaringClass() == getDeclaringClass() && o.type == type && o.name.equals(name);
236 public class Method extends Member {
237 final Type[] argTypes;
238 public final Type returnType;
239 public Type getReturnType() { return returnType; }
240 public int getNumArgs() { return argTypes.length; }
241 public Type getArgType(int i) { return argTypes[i]; }
242 public Type[] getArgTypes() {
243 Type[] ret = new Type[argTypes.length];
244 System.arraycopy(argTypes, 0, ret, 0, ret.length);
247 public boolean isConstructor() { return getName().equals("<init>"); }
248 public boolean isClassInitializer() { return getName().equals("<clinit>"); }
250 public String toString() {
251 StringBuffer sb = new StringBuffer();
252 if (name.equals("<clinit>")) sb.append("static ");
254 if (name.equals("<init>"))
255 sb.append(Class.this.getShortName());
257 sb.append(returnType.toString()).append(" ").append(name);
259 for(int i=0; i<argTypes.length; i++)
260 sb.append((i==0?"":", ")+argTypes[i].toString());
263 return sb.toString();
265 private Method(String name, Type returnType, Type[] argTypes) {
267 this.argTypes = argTypes;
268 this.returnType = returnType;
270 //public Method.Body getBody(Context cx) { }
271 public String getTypeDescriptor() {
272 StringBuffer sb = new StringBuffer(argTypes.length*4);
274 for(int i=0;i<argTypes.length;i++) sb.append(argTypes[i].getDescriptor());
276 sb.append(returnType.getDescriptor());
277 return sb.toString();
279 public abstract class Body extends HasAttributes {
280 public abstract java.util.Hashtable getThrownExceptions();
281 public abstract void debugBodyToString(StringBuffer sb);
282 public Method getMethod() { return Method.this; }
283 public Body(int flags, ClassFile.AttrGen attrs) {
285 if ((flags & ~VALID_METHOD_FLAGS) != 0) throw new IllegalArgumentException("invalid flags");
287 public boolean isConcrete() { return !isAbstract() && !isNative() /*FIXME: !inAnInterface*/; }
288 public void toString(StringBuffer sb, String constructorName) {
289 int flags = getFlags();
290 sb.append(" ").append(ClassFile.flagsToString(flags,false));
291 sb.append(Method.this.toString());
292 java.util.Hashtable thrownExceptions = getThrownExceptions();
293 if (thrownExceptions.size() > 0) {
295 for(java.util.Enumeration e = thrownExceptions.keys();e.hasMoreElements();)
296 sb.append(" ").append(((Type.Class)e.nextElement()).toString()).append(",");
297 sb.setLength(sb.length()-1);
300 if ((flags & (NATIVE|ABSTRACT))==0) {
302 debugBodyToString(sb);
309 public int hashCode() {
310 int h = returnType.hashCode() ^ name.hashCode() ^ getDeclaringClass().hashCode();
311 for(int i=0;i<argTypes.length;i++) h ^= argTypes[i].hashCode();
314 public boolean equals(Object o_) {
315 if(o_ == this) return true;
316 if(!(o_ instanceof Method)) return false;
317 Method o = (Method) o_;
318 if(!(o.getDeclaringClass() == getDeclaringClass() && o.returnType == returnType && o.name.equals(name))) return false;
319 if(o.argTypes.length != argTypes.length) return false;
320 for(int i=0;i<argTypes.length;i++)
321 if(o.argTypes[i] != argTypes[i]) return false;
327 // FEATURE: This probably isn't the best place for these
328 static String methodTypeDescriptor(Type[] argTypes, Type returnType) {
329 StringBuffer sb = new StringBuffer(argTypes.length*4);
331 for(int i=0;i<argTypes.length;i++) sb.append(argTypes[i].getDescriptor());
333 sb.append(returnType.getDescriptor());
334 return sb.toString();