X-Git-Url: http://git.megacz.com/?p=org.ibex.classgen.git;a=blobdiff_plain;f=src%2Forg%2Fibex%2Fclassgen%2FType.java;h=08c346fba161b6773def91c5c6e7dd5a22e9b51b;hp=47494ae068df86a79066a51b1dda5927b86a856f;hb=e70f9a95d3058a30dc93d8d45078ece8bb7a7dc6;hpb=42a1bb10686a80875ffc209626fedaec95095d0f

diff --git a/src/org/ibex/classgen/Type.java b/src/org/ibex/classgen/Type.java
index 47494ae..08c346f 100644
--- a/src/org/ibex/classgen/Type.java
+++ b/src/org/ibex/classgen/Type.java
@@ -1,122 +1,257 @@
 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;
-
-    public String humanReadable() {
-        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";
-        throw new Error("confounded by Type("+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);
     }
 
-    protected Type(String descriptor) { this.descriptor = descriptor; }
+    public final String  toString() { return super.toString(); }
+    public abstract String debugToString();
     
-    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(descriptor.endsWith("[")) return new Type.Array(fromDescriptor(descriptor.substring(0, descriptor.indexOf('['))),
-                                                           descriptor.length() - descriptor.indexOf('['));
-        return new Type.Object(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;
+    
+    protected Type(String descriptor) {
+        this.descriptor = descriptor;
+        instances.put(descriptor, this);
+    }
+
+    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; }
     }
-        
-    /** 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); }
     
-    public String toString() { return getDescriptor(); }
-    public Type.Object asObject() { throw new RuntimeException("attempted to use "+this+" as a Type.Object, which it is not"); }
-    public Type.Array asArray() { throw new RuntimeException("attempted to use "+this+" as a Type.Array, which it is not"); }
-    public Type.Array makeArray() { return new Type.Array(this); }
-    public Type.Array makeArray(int dim) { return new Type.Array(this, dim); }
-    public boolean isObject() { return false; }
-    public boolean isArray() { return false; }
-
-    /** Class representing Object 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 */
-        protected Object(String s) { super(_initHelper(s)); }
-        public Type.Object asObject() { return this; }
-        public boolean isObject() { return true; }
-        public String humanReadable() { return internalForm().replace('/', '.'); }
+    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() {
-            String hr = humanReadable();
-            return hr.substring(hr.lastIndexOf('.')+1);
+            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), "/");
             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); }
-    }    
 
-    public static class Array extends Object {
-        private int dim;
-        protected Array(Type t) { super(_initHelper(t, 1)); this.dim = 1; }
-        protected Array(Type t, int dim) { super(_initHelper(t, dim)); this.dim = dim; }
-        public Type.Array asArray() { return this; }
-        public boolean isArray() { return true; }
-        public String humanReadable() { 
-            String ret = super.internalForm().replace('/', '.');
-            for(int i=0; i<dim; i++) ret += "[]";
-            return ret;
+        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; }
+            }
         }
-        String internalForm() { throw new Error("Type.Array does not have an internalForm()"); }
-        String[] components() { throw new Error("Type.Array does not have components()"); }
-        private static String _initHelper(Type t, int dim) {
-            StringBuffer sb = new StringBuffer(t.descriptor.length() + dim);
-            for(int i=0;i<dim;i++) sb.append("[");
-            sb.append(t.descriptor);
-            return sb.toString();
+
+        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();
+    }
 
 }