1 package org.ibex.classgen;
3 import java.util.StringTokenizer;
4 import java.util.Hashtable;
6 public 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 Type("V", "void");
13 public static final Type INT = new Type("I", "int");
14 public static final Type LONG = new Type("J", "long");
15 public static final Type BOOLEAN = new Type("Z", "boolean");
16 public static final Type DOUBLE = new Type("D", "double");
17 public static final Type FLOAT = new Type("F", "float");
18 public static final Type BYTE = new Type("B", "byte");
19 public static final Type CHAR = new Type("C", "char");
20 public static final Type SHORT = new Type("S", "short");
22 public static final Type.Class OBJECT = new Type.Class("java.lang.Object");
23 public static final Type.Class STRING = new Type.Class("java.lang.String");
24 public static final Type.Class STRINGBUFFER = new Type.Class("java.lang.StringBuffer");
25 public static final Type.Class INTEGER_OBJECT = new Type.Class("java.lang.Integer");
26 public static final Type.Class DOUBLE_OBJECT = new Type.Class("java.lang.Double");
27 public static final Type.Class FLOAT_OBJECT = new Type.Class("java.lang.Float");
29 /** A zero element Type[] array (can be passed as the "args" param when a method takes no arguments */
30 public static final Type[] NO_ARGS = new Type[0];
32 /** guarantee: there will only be one instance of Type for a given descriptor ==> equals() and == are interchangeable */
33 public static Type instance(String d) {
34 Type ret = (Type)instances.get(d);
35 if (ret != null) return ret;
36 if (d.startsWith("[")) return new Type.Array(instance(d.substring(1)));
37 return new Type.Class(d);
40 public String toString() { return toString; }
41 public String debugToString() { return toString; }
42 public final String getDescriptor() { return descriptor; }
44 public Type.Array makeArray() { return (Type.Array)instance("["+descriptor); }
45 public Type.Array makeArray(int i) { return i==0 ? (Type.Array)this : makeArray().makeArray(i-1); }
47 public Type.Ref asRef() { throw new RuntimeException("attempted to use "+this+" as a Type.Ref, which it is not"); }
48 public Type.Class asClass() { throw new RuntimeException("attempted to use "+this+" as a Type.Class, which it is not"); }
49 public Type.Array asArray() { throw new RuntimeException("attempted to use "+this+" as a Type.Array, which it is not"); }
50 public boolean isPrimitive() { return !isRef(); }
51 public boolean isRef() { return false; }
52 public boolean isClass() { return false; }
53 public boolean isArray() { return false; }
55 // Protected/Private //////////////////////////////////////////////////////////////////////////////
57 protected final String descriptor;
58 protected final String toString;
59 protected Type(String descriptor) { this(descriptor, descriptor); }
60 protected Type(String descriptor, String humanReadable) {
61 this.toString = humanReadable;
62 instances.put(this.descriptor = descriptor, this);
65 public static class Ref extends Type {
66 protected Ref(String descriptor) { super(descriptor); }
67 protected Ref(String descriptor, String humanReadable) { super(descriptor, humanReadable); }
68 public Type.Ref asRef() { return this; }
69 public boolean isRef() { return true; }
72 public static class Array extends Type.Ref {
73 protected Array(Type t) { super("[" + t.getDescriptor(), t.toString() + "[]"); }
74 public Type.Array asArray() { return this; }
75 public boolean isArray() { return true; }
76 public int dimension() { return getDescriptor().lastIndexOf('['); }
77 public Type getElementType() { return Type.instance(getDescriptor().substring(0, getDescriptor().length()-1)); }
80 public static class Class extends Type.Ref {
81 protected Class(String s) { super(_initHelper(s), _initHelper2(s)); }
82 public Type.Class asClass() { return this; }
83 public boolean isClass() { return true; }
84 public String getShortName() { return toString.substring(toString.lastIndexOf('.')+1); }
85 public String getName() { return toString(); }
86 //public boolean extendsOrImplements(Type.Class c, Context cx) { }
87 String internalForm() { return descriptor.substring(1, descriptor.length()-1); }
88 private static String _initHelper(String s) {
89 if (!s.startsWith("L") || !s.endsWith(";")) s = "L" + s.replace('.', '/') + ";";
92 private static String _initHelper2(String s) {
93 if (s.startsWith("L") && s.endsWith(";")) s = s.substring(1, s.length()-1);
94 return s.replace('/', '.');
96 String[] components() {
97 StringTokenizer st = new StringTokenizer(descriptor.substring(1, descriptor.length()-1), "/");
98 String[] a = new String[st.countTokens()];
99 for(int i=0;st.hasMoreTokens();i++) a[i] = st.nextToken();
103 public Field field(String name, Type type) { return new Field(name, type); }
104 public Method method(String name, Type returnType, Type[] argTypes) { return new Method(name, returnType, argTypes); }
105 public Method method(String name, String typeDescriptor) {
106 // FEATURE: This parser is ugly but it works (and shouldn't be a problem) might want to clean it up though
107 String s = typeDescriptor;
108 if(!s.startsWith("(")) throw new IllegalArgumentException("invalid method type descriptor");
109 int p = s.indexOf(')');
110 if(p == -1) throw new IllegalArgumentException("invalid method type descriptor");
111 String argsDesc = s.substring(1,p);
112 String retDesc = s.substring(p+1);
113 Type[] argsBuf = new Type[argsDesc.length()];
115 for(i=0,p=0;argsDesc.length() > 0;i++,p=0) {
116 while(p < argsDesc.length() && argsDesc.charAt(p) == '[') p++;
117 if(p == argsDesc.length()) throw new IllegalArgumentException("invalid method type descriptor");
118 if(argsDesc.charAt(p) == 'L') {
119 p = argsDesc.indexOf(';');
120 if(p == -1) throw new IllegalArgumentException("invalid method type descriptor");
122 argsBuf[i] = Type.instance(argsDesc.substring(0,p+1));
123 argsDesc = argsDesc.substring(p+1);
125 Type args[] = new Type[i];
126 System.arraycopy(argsBuf,0,args,0,i);
127 return method(name, Type.instance(retDesc), args);
130 public abstract class Member {
131 public final String name;
132 private Member(String name) { this.name = name; }
133 public Type.Class getDeclaringClass() { return Type.Class.this; }
134 public abstract String getDescriptor();
135 public boolean equals(Object o_) {
136 if(!(o_ instanceof Member)) return false;
137 Member o = (Member) o_;
138 return o.getDeclaringClass().equals(getDeclaringClass()) &&
139 o.name.equals(name) &&
140 o.getDescriptor().equals(getDescriptor());
142 public int hashCode() { return getDeclaringClass().hashCode() ^ name.hashCode() ^ getDescriptor().hashCode(); }
143 public String toString() { return debugToString(); }
144 public abstract String debugToString();
147 public class Field extends Member {
148 public final Type type;
149 private Field(String name, Type t) { super(name); this.type = t; }
150 public String getTypeDescriptor() { return type.getDescriptor(); }
151 public Type getType() { return type; }
152 public String debugToString() { return getDeclaringClass()+"."+name+"["+type+"]"; }
153 public class Body extends HasFlags {
154 public final int flags;
155 public Body(int flags) { this.flags = flags; }
156 public int getFlags() { return flags; }
160 public class Method extends Member {
161 final Type[] argTypes;
162 public final Type returnType;
163 public Type getReturnType() { return returnType; }
164 public int getNumArgs() { return argTypes.length; }
165 public Type getArgType(int i) { return argTypes[i]; }
166 public Type[] getArgTypes() {
167 Type[] ret = new Type[argTypes.length];
168 System.arraycopy(argTypes, 0, ret, 0, ret.length);
172 public boolean isConstructor() { return getName().equals("<init>"); }
173 public boolean isClassInitializer() { return getName().equals("<clinit>"); }
174 public String debugToString() {
175 StringBuffer sb = new StringBuffer();
176 if (name.equals("<clinit>")) sb.append("static ");
178 if (name.equals("<init>"))
179 sb.append(Class.this.getShortName());
181 sb.append(returnType).append(" ").append(name);
183 for(int i=0; i<argTypes.length; i++)
184 sb.append((i==0?"":", ")+argTypes[i].debugToString());
187 return sb.toString();
189 private Method(String name, Type returnType, Type[] argTypes) {
191 this.argTypes = argTypes;
192 this.returnType = returnType;
194 public String getDescriptor() {
195 StringBuffer sb = new StringBuffer(argTypes.length*4);
197 for(int i=0;i<argTypes.length;i++) sb.append(argTypes[i].getDescriptor());
199 sb.append(returnType.getDescriptor());
200 return sb.toString();
202 public abstract class Body extends HasFlags {
203 public abstract java.util.Hashtable getThrownExceptions();
204 public abstract void debugBodyToString(StringBuffer sb);
205 public void debugToString(StringBuffer sb, String constructorName) {
206 int flags = getFlags();
207 sb.append(" ").append(ClassFile.flagsToString(flags,false));
208 sb.append(Method.this.debugToString());
209 java.util.Hashtable thrownExceptions = getThrownExceptions();
210 if (thrownExceptions.size() > 0) {
212 for(java.util.Enumeration e = thrownExceptions.keys();e.hasMoreElements();)
213 sb.append(" ").append(((Type.Class)e.nextElement()).debugToString()).append(",");
214 sb.setLength(sb.length()-1);
217 if ((flags & (NATIVE|ABSTRACT))==0) {
219 debugBodyToString(sb);
229 // FEATURE: This probably isn't the best place for these
230 static String methodTypeDescriptor(Type[] argTypes, Type returnType) {
231 StringBuffer sb = new StringBuffer(argTypes.length*4);
233 for(int i=0;i<argTypes.length;i++) sb.append(argTypes[i].getDescriptor());
235 sb.append(returnType.getDescriptor());
236 return sb.toString();