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package com.oracle.truffle.sl.nodes.local;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.profiles.BranchProfile;
import com.oracle.truffle.sl.nodes.SLExpressionNode;
import com.oracle.truffle.sl.parser.SLNodeFactory;
import com.oracle.truffle.sl.runtime.SLNull;
/**
* Reads a function argument. Arguments are passed in as an object array.
*
* Arguments are not type-specialized. To ensure that repeated accesses within a method are
* specialized and can, e.g., be accessed without unboxing, all arguments are loaded into local
* variables {@link SLNodeFactory#addFormalParameter in the method prologue}.
*/
public class SLReadArgumentNode extends SLExpressionNode {
/** The argument number, i.e., the index into the array of arguments. */
private final int index;
/**
* Profiling information, collected by the interpreter, capturing whether the function was
* called with fewer actual arguments than formal arguments.
*/
private final BranchProfile outOfBoundsTaken = BranchProfile.create();
public SLReadArgumentNode(int index) {
this.index = index;
}
@Override
public Object executeGeneric(VirtualFrame frame) {
Object[] args = frame.getArguments();
if (index < args.length) {
return args[index];
} else {
/* In the interpreter, record profiling information that the branch was used. */
outOfBoundsTaken.enter();
/* Use the default null value. */
return SLNull.SINGLETON;
}
}
}