private static final int NO_CODE = -1;
- private final Type.Class.Method method;
+ public final Type.Class.Method method;
private final int flags;
private final ClassFile.AttrGen attrs;
private final ClassFile.AttrGen codeAttrs;
private byte[] op;
private Object[] arg;
private ConstantPool.Ent[] cparg;
-
+
+
// Constructors //////////////////////////////////////////////////////////////////////////////
MethodGen(Type.Class.Method method, int flags) {
if (((flags & INTERFACE) != 0) || (flags & (ABSTRACT|NATIVE)) != 0) size = capacity = -1;
- maxLocals = Math.max(args.length + (flags&STATIC)==0 ? 1 : 0, 4);
+ maxLocals = Math.max(method.getNumArgs() + (flags&STATIC)==0 ? 1 : 0, 4);
}
MethodGen(Type.Class c, DataInput in, ConstantPool cp) throws IOException {
ConstantPool.Ent ent = cp.getByIndex(in.readUnsignedShort());
if (ent.tag != CONSTANT_INTERFACEMETHODREF) throw new ClassFile.ClassReadExn("illegal argument to bytecode");
arg = ((ConstantPool.InterfaceMethodKey)ent.key()).method;
- if (in.readByte() == 0 || in.readByte() != 0) throw new ClassFile.ClassReadExn("illegal count or 0 arg to invokeinterface");
+ if (in.readByte() == 0 || in.readByte() != 0)
+ throw new ClassFile.ClassReadExn("illegal count or 0 arg to invokeinterface");
break;
}
default:
if ((opdata&OP_CPENT_FLAG)!=0) {
- ConstantPool.Ent ent = cp.getByIndex(argLength == 2 ? in.readUnsignedShort() : argLength == 1 ? in.readUnsignedByte() : -1);
+ ConstantPool.Ent ent =
+ cp.getByIndex(argLength == 2 ? in.readUnsignedShort() : argLength == 1 ? in.readUnsignedByte() : -1);
int tag = ent.tag;
Object key = ent.key();
switch(op) {
case CONSTANT_CLASS:
break;
default:
- throw new ClassFile.ClassReadExn("illegal argument to bytecode 0x" + Integer.toString(op&0xff,16));
+ throw new ClassFile.ClassReadExn("illegal argument to bytecode 0x" +
+ Integer.toString(op&0xff,16));
}
break;
case GETSTATIC:
case PUTSTATIC:
case GETFIELD:
case PUTFIELD:
- if (tag != CONSTANT_FIELDREF) throw new ClassFile.ClassReadExn("illegal argument to bytecode 0x" + Integer.toString(op&0xff,16));
+ if (tag != CONSTANT_FIELDREF)
+ throw new ClassFile.ClassReadExn("illegal argument to bytecode 0x" +
+ Integer.toString(op&0xff,16));
break;
case INVOKEVIRTUAL:
case INVOKESPECIAL:
case INVOKESTATIC:
- if (tag != CONSTANT_METHODREF) throw new ClassFile.ClassReadExn("illegal argument to bytecode 0x" + Integer.toString(op&0xff,16));
+ if (tag != CONSTANT_METHODREF)
+ throw new ClassFile.ClassReadExn("illegal argument to bytecode 0x" +
+ Integer.toString(op&0xff,16));
break;
case NEW:
case ANEWARRAY:
case CHECKCAST:
case INSTANCEOF:
- if (tag != CONSTANT_CLASS) throw new ClassFile.ClassReadExn("illegal argument to bytecode 0x" + Integer.toString(op&0xff,16));
+ if (tag != CONSTANT_CLASS)
+ throw new ClassFile.ClassReadExn("illegal argument to bytecode 0x" +
+ Integer.toString(op&0xff,16));
break;
default:
throw new Error("should never happen");
Switch si = (Switch) arg[i];
int pos = map[si.getDefaultTarget()];
- if (pos < 0) throw new ClassFile.ClassReadExn("default target points to invalid bytecode: " + si.getDefaultTarget());
+ if (pos < 0)
+ throw new ClassFile.ClassReadExn("default target points to invalid bytecode: " + si.getDefaultTarget());
si.setDefaultTarget(pos);
for(int j=0;j<si.size();j++) {
}
/** Adds a exception type that can be thrown from this method
- NOTE: This isn't enforced by the JVM. This is for reference only. A method can throw exceptions not declared to be thrown
+ NOTE: This isn't enforced by the JVM. This is for reference
+ only. A method can throw exceptions not declared to be thrown
@param type The type of exception that can be thrown
*/
public final void addThrow(Type.Class type) { thrownExceptions.put(type, type); }
size++;
return s;
}
+
/** Set the bytecode at position <i>pos</i> to <i>op</i> */
public final void set(int pos, byte op) { this.op[pos] = op; }
@return The position of the new bytecode
*/
public final int add(byte op, Object arg) { if (capacity == size) grow(); set(size, op, arg); return size++; }
+
/** Adds a bytecode with a boolean argument - equivalent to add(op, arg?1:0);
@return The position of the new bytecode
@see #add(byte, int)
*/
public final int add(byte op, boolean arg) { if (capacity == size) grow(); set(size, op, arg); return size++; }
- /** Adds a bytecode with an integer argument. This is equivalent to add(op, new Integer(arg)), but optimized to prevent the allocation when possible
+
+ /** Adds a bytecode with an integer argument. This is equivalent
+ * to add(op, new Integer(arg)), but optimized to prevent the
+ * allocation when possible
@return The position of the new bytecode
@see #add(byte, Object)
*/
*/
public final Object getArg(int pos) { return arg[pos]; }
- /** Sets the argument for <i>pos</i> to <i>arg</i>. This is equivalent to set(pos, op, new Integer(arg)), but optimized to prevent the allocation when possible.
+ /** Sets the argument for <i>pos</i> to <i>arg</i>. This is
+ * equivalent to set(pos, op, new Integer(arg)), but optimized to
+ * prevent the allocation when possible.
@exception ArrayIndexOutOfBoundException if pos < 0 || pos >= size()
@see #setArg(int, Object) */
public final void setArg(int pos, int arg) { set(pos, op[pos], N(arg)); }
+
/** Sets the argument for <i>pos</i> to <i>arg</i>.
- @exception ArrayIndexOutOfBoundException if pos < 0 || pos >= size()
- */
+ @exception ArrayIndexOutOfBoundException if pos < 0 || pos >= size() */
public final void setArg(int pos, Object arg) { set(pos, op[pos], arg); }
/** Sets the bytecode and argument at <i>pos</i> to <i>op</i> and <i>arg</i> respectivly.
this.arg[pos] = arg;
}
+ /** Sets the maximum number of locals in the function to
+ <i>maxLocals</i>. NOTE: This defaults to 0 and is
+ automatically increased as necessary when *LOAD/*STORE
+ bytecodes are added. You do not need to call this function in
+ most cases */
+ public void setMaxLocals(int maxLocals) { this.maxLocals = maxLocals; }
+
+ /** Sets the maxinum size of th stack for this function to
+ * <i>maxStack</i>. This defaults to 16< */
+ public void setMaxStack(int maxStack) { this.maxStack = maxStack; }
+
+
+ // Bytecode-Specific inner classes ////////////////////////////////////////////////////////////////////////////////
+
public static abstract class Switch {
public final Object[] targets;
public Object defaultTarget;
int length() { return 12 + targets.length * 4; } // 4bytes/target, hi, lo, default
}
- public static class Lookup extends Table {
+ public static class Lookup extends Switch {
public final int[] vals;
public Lookup(int size) {
super(size);
Wide(byte op, int varNum) { this(op, varNum, 0); }
Wide(byte op, int varNum, int n) { this.op = op; this.varNum = varNum; this.n = n; }
}
-
- /** Sets the maximum number of locals in the function to <i>maxLocals</i>. NOTE: This defaults to 0 and is automatically increased as
- necessary when *LOAD/*STORE bytecodes are added. You do not need to call this function in most cases */
- public void setMaxLocals(int maxLocals) { this.maxLocals = maxLocals; }
- /** Sets the maxinum size of th stack for this function to <i>maxStack</i>. This defaults to 16< */
- public void setMaxStack(int maxStack) { this.maxStack = maxStack; }
+
+
+ // Emitting Bits //////////////////////////////////////////////////////////////////////////////
+
+ private Object resolveTarget(Object arg) {
+ int target;
+ if (arg instanceof PhantomTarget) {
+ target = ((PhantomTarget)arg).getTarget();
+ if (target == -1) throw new IllegalStateException("unresolved phantom target");
+ arg = N(target);
+ } else {
+ target = ((Integer)arg).intValue();
+ }
+ if (target < 0 || target >= size)
+ throw new IllegalStateException("invalid target address " + target + "/" + size);
+ return arg;
+ }
/** Computes the final bytecode for this method.
@exception IllegalStateException if the data for a method is in an inconsistent state (required arguments missing, etc)
}
}
}
-
- private Object resolveTarget(Object arg) {
- int target;
- if (arg instanceof PhantomTarget) {
- target = ((PhantomTarget)arg).getTarget();
- if (target == -1) throw new IllegalStateException("unresolved phantom target");
- arg = N(target);
- } else {
- target = ((Integer)arg).intValue();
- }
- if (target < 0 || target >= size)
- throw new IllegalStateException("invalid target address " + target + "/" + size);
- return arg;
- }
-
+
private void generateCode(ConstantPool cp) {
try {
_generateCode(cp);
} else {
int iarg = ((Integer)arg).intValue();
if (argLength == 1) {
- if ((opdata & OP_UNSIGNED_FLAG) != 0 ? iarg >= 256 : (iarg < -128 || iarg >= 128)) throw new ClassFile.Exn("overflow of s/u1 option");
+ if ((opdata & OP_UNSIGNED_FLAG) != 0 ? iarg >= 256 : (iarg < -128 || iarg >= 128))
+ throw new ClassFile.Exn("overflow of s/u1 option");
o.writeByte(iarg);
} else if (argLength == 2) {
- if ((opdata & OP_UNSIGNED_FLAG) != 0 ? iarg >= 65536 : (iarg < -32768 || iarg >= 32768)) throw new ClassFile.Exn("overflow of s/u2 option");
+ if ((opdata & OP_UNSIGNED_FLAG) != 0 ? iarg >= 65536 : (iarg < -32768 || iarg >= 32768))
+ throw new ClassFile.Exn("overflow of s/u2 option");
o.writeShort(iarg);
} else {
throw new Error("should never happen");
attrs.dump(o,cp);
}
- /** Negates the IF* instruction, <i>op</i> (IF_ICMPGT -> IF_ICMPLE, IFNE -> IFEQ, etc)
- @exception IllegalArgumentException if <i>op</i> isn't an IF* instruction */
- public static byte negate(byte op) {
- switch(op) {
- case IFEQ: return IFNE;
- case IFNE: return IFEQ;
- case IFLT: return IFGE;
- case IFGE: return IFLT;
- case IFGT: return IFLE;
- case IFLE: return IFGT;
- case IF_ICMPEQ: return IF_ICMPNE;
- case IF_ICMPNE: return IF_ICMPEQ;
- case IF_ICMPLT: return IF_ICMPGE;
- case IF_ICMPGE: return IF_ICMPLT;
- case IF_ICMPGT: return IF_ICMPLE;
- case IF_ICMPLE: return IF_ICMPGT;
- case IF_ACMPEQ: return IF_ACMPNE;
- case IF_ACMPNE: return IF_ACMPEQ;
-
- default:
- throw new IllegalArgumentException("Can't negate " + Integer.toHexString(op));
- }
- }
-
- /** Class that represents a target that isn't currently know. The target MUST be set with setTarget() before the classfile is written.
- This class is more or less a mutable integer */
+
+ /** Class that represents a target that isn't currently know. The
+ target MUST be set with setTarget() before the classfile is
+ written. This class is more or less a mutable integer */
public static class PhantomTarget {
private int target = -1;
public void setTarget(int target) { this.target = target; }
}
}
+ // Unused //////////////////////////////////////////////////////////////////////////////
+
+ /** Negates the IF* instruction, <i>op</i> (IF_ICMPGT -> IF_ICMPLE, IFNE -> IFEQ, etc)
+ @exception IllegalArgumentException if <i>op</i> isn't an IF* instruction */
+ public static byte negate(byte op) {
+ switch(op) {
+ case IFEQ: return IFNE;
+ case IFNE: return IFEQ;
+ case IFLT: return IFGE;
+ case IFGE: return IFLT;
+ case IFGT: return IFLE;
+ case IFLE: return IFGT;
+ case IF_ICMPEQ: return IF_ICMPNE;
+ case IF_ICMPNE: return IF_ICMPEQ;
+ case IF_ICMPLT: return IF_ICMPGE;
+ case IF_ICMPGE: return IF_ICMPLT;
+ case IF_ICMPGT: return IF_ICMPLE;
+ case IF_ICMPLE: return IF_ICMPGT;
+ case IF_ACMPEQ: return IF_ACMPNE;
+ case IF_ACMPNE: return IF_ACMPEQ;
+
+ default:
+ throw new IllegalArgumentException("Can't negate " + Integer.toHexString(op));
+ }
+ }
+
+
}
projects / org.ibex.classgen.git / blobdiff