/** Optimize a bi-conditional expression */
protected void genBranch(
JExpression left,
JExpression right,
boolean cond,
GenerationContext context,
CodeLabel label) {
CodeSequence code = context.getCodeSequence();
if (cond) {
CodeLabel skip = new CodeLabel();
left.genBranch(false, context, skip);
right.genBranch(true, context, label);
code.plantLabel(skip);
} else {
left.genBranch(false, context, label);
right.genBranch(false, context, label);
}
}
/**
* Generates a bytecode sequence to convert a value of this type to the specified destination
* type.
*
* @param dest the destination type
* @param code the code sequence
*/
public void genCastTo(CNumericType dest, GenerationContext context) {
CodeSequence code = context.getCodeSequence();
if (dest != this) {
switch (dest.type) {
case TID_BYTE:
code.plantNoArgInstruction(opc_i2b);
break;
case TID_SHORT:
code.plantNoArgInstruction(opc_i2s);
break;
case TID_INT:
break;
case TID_LONG:
code.plantNoArgInstruction(opc_i2l);
break;
case TID_FLOAT:
code.plantNoArgInstruction(opc_i2f);
break;
case TID_DOUBLE:
code.plantNoArgInstruction(opc_i2d);
break;
default:
throw new InconsistencyException();
}
}
}
/**
* Generates a sequence of bytescodes
*
* @param code the code list
*/
public void genCode(GenerationContext context) {
CodeSequence code = context.getCodeSequence();
setLineNumber(code);
code.pushContext(this);
if (cond.isConstant() && cond.booleanValue()) {
// while (true)
code.plantLabel(getContinueLabel()); // body:
LocalVariableScope scope = new LocalVariableScope();
code.pushLocalVariableScope(scope);
body.genCode(context); // BODY CODE
code.popLocalVariableScope(scope);
code.plantJumpInstruction(opc_goto, getContinueLabel()); // GOTO body
} else {
CodeLabel bodyLabel = new CodeLabel();
code.plantJumpInstruction(opc_goto, getContinueLabel()); // GOTO cont
code.plantLabel(bodyLabel); // body:
LocalVariableScope scope = new LocalVariableScope();
code.pushLocalVariableScope(scope);
body.genCode(context); // BODY CODE
code.popLocalVariableScope(scope);
code.plantLabel(getContinueLabel()); // cont:
cond.genBranch(true, context, bodyLabel); // EXPR CODE; IFNE body
}
code.plantLabel(getBreakLabel()); // end: ...
code.popContext(this);
}
