package org.simantics.scl.compiler.internal.codegen.utils;

import org.cojen.classfile.TypeDesc;
import org.simantics.scl.runtime.SCLContext;

public enum SCLContextPreparationStep implements PreparationStep<LocalVariable> {
    INSTANCE;
    
    public final static TypeDesc SCL_CONTEXT = TypeDesc.forClass(SCLContext.class);
    
    public static LocalVariable getCurrent(MethodBuilder mb) {
        LocalVariable var = mb.getPreparation(INSTANCE);
        if(var == null) {
            var = mb.createLocalVariable("sclContext", SCL_CONTEXT);
            mb.invokeStatic(SCL_CONTEXT, "getCurrent", SCL_CONTEXT, Constants.EMPTY_TYPEDESC_ARRAY);
            mb.storeLocal(var);
            mb.addPreparation(INSTANCE, var);
        }
        return var;
    }
}