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;
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 //////////////////////////////////////////////////////////////////////////////
+
+ /** 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));
+ }
+ }
+
+ 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; }
projects / org.ibex.classgen.git / commitdiff