ConstMissingInstr.java

package org.jruby.ir.instructions;

import org.jcodings.specific.USASCIIEncoding;
import org.jruby.RubyModule;
import org.jruby.ir.IRVisitor;
import org.jruby.ir.Operation;
import org.jruby.ir.operands.Operand;
import org.jruby.ir.operands.Symbol;
import org.jruby.ir.operands.Variable;
import org.jruby.ir.transformations.inlining.CloneInfo;
import org.jruby.parser.StaticScope;
import org.jruby.runtime.CallType;
import org.jruby.runtime.DynamicScope;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;

import java.util.Map;

public class ConstMissingInstr extends CallInstr implements ResultInstr, FixedArityInstr {
    private final String missingConst;

    public ConstMissingInstr(Variable result, Operand currentModule, String missingConst) {
        // FIXME: Missing encoding knowledge of the constant name.
        super(Operation.CONST_MISSING, CallType.FUNCTIONAL, result, "const_missing", currentModule, new Operand[]{new Symbol(missingConst, USASCIIEncoding.INSTANCE)}, null);

        this.missingConst = missingConst;
    }

    public String getMissingConst() {
        return missingConst;
    }

    @Override
    public void simplifyOperands(Map<Operand, Operand> valueMap, boolean force) {
        receiver = receiver.getSimplifiedOperand(valueMap, force);
    }

    @Override
    public Variable getResult() {
        return result;
    }

    @Override
    public void updateResult(Variable v) {
        this.result = v;
    }

    // we don't want to convert const_missing to an actual call
    @Override
    public CallBase specializeForInterpretation() {
        return this;
    }

    @Override
    public Instr clone(CloneInfo ii) {
        return new ConstMissingInstr(ii.getRenamedVariable(result), receiver.cloneForInlining(ii), missingConst);
    }

    @Override
    public String toString() {
        return super.toString() + "(" + receiver + "," + missingConst  + ")";
    }

    @Override
    public Object interpret(ThreadContext context, StaticScope currScope, DynamicScope currDynScope, IRubyObject self, Object[] temp) {
        RubyModule module = (RubyModule) receiver.retrieve(context, self, currScope, currDynScope, temp);
        return module.callMethod(context, "const_missing", context.runtime.fastNewSymbol(missingConst));
    }

    @Override
    public void visit(IRVisitor visitor) {
        visitor.ConstMissingInstr(this);
    }
}