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 * Version: EPL 1.0/GPL 2.0/LGPL 2.1
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 * The contents of this file are subject to the Eclipse Public
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 * except in compliance with the License. You may obtain a copy of
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package org.jruby.runtime.opto;

import org.jruby.RubyModule;
import org.jruby.compiler.CacheCompiler;
import org.jruby.compiler.InvocationCompiler;
import org.jruby.compiler.impl.BaseBodyCompiler;
import org.jruby.compiler.impl.InheritedCacheCompiler;
import org.jruby.compiler.impl.InvokeDynamicCacheCompiler;
import org.jruby.compiler.impl.InvokeDynamicInvocationCompiler;
import org.jruby.compiler.impl.SkinnyMethodAdapter;
import org.jruby.compiler.impl.StandardASMCompiler;
import org.jruby.compiler.impl.StandardInvocationCompiler;
import org.jruby.util.cli.Options;

/**
 * A set of factory methods to construct optimizing utilities for compilation,
 * cache invalidation, and so on.
 */
public class OptoFactory {
    public static InvocationCompiler newInvocationCompiler(BaseBodyCompiler bodyCompiler, SkinnyMethodAdapter method) {
        if (indyEnabled()) {
            try {
                return new InvokeDynamicInvocationCompiler(bodyCompiler, method);
            } catch (Error e) {
                disableIndy();
                throw e;
            } catch (Throwable t) {
                disableIndy();
            }
        }
        return new StandardInvocationCompiler(bodyCompiler, method);
    }
    
    public static CacheCompiler newCacheCompiler(StandardASMCompiler scriptCompiler) {
        if (indyEnabled()) {
            try {
                return new InvokeDynamicCacheCompiler(scriptCompiler);
            } catch (Error e) {
                disableIndy();
                throw e;
            } catch (Throwable t) {
                disableIndy();
            }
        }
        return new InheritedCacheCompiler(scriptCompiler);
    }
    
    public static Invalidator newConstantInvalidator() {
        if (indyEnabled() && indyConstants()) {
            try {
                return new SwitchPointInvalidator();
            } catch (Error e) {
                disableIndy();
                throw e;
            } catch (Throwable t) {
                disableIndy();
            }
        }
        return new ObjectIdentityInvalidator();
    }

    private static Boolean indyEnabled() {
        return Options.COMPILE_INVOKEDYNAMIC.load();
    }

    public static Invalidator newGlobalInvalidator(int maxFailures) {
        if (indyEnabled() && indyConstants()) {
            try {
                return new FailoverSwitchPointInvalidator(maxFailures);
            } catch (Error e) {
                disableIndy();
                throw e;
            } catch (Throwable t) {
                disableIndy();
            }
        }
        return new ObjectIdentityInvalidator();
    }

    public static Invalidator newMethodInvalidator(RubyModule module) {
        if (indyEnabled() && indyInvocationSwitchpoint()) {
            try {
                return new GenerationAndSwitchPointInvalidator(module);
            } catch (Error e) {
                disableIndy();
                throw e;
            } catch (Throwable t) {
                disableIndy();
            }
        }
        return new GenerationInvalidator(module);
    }

    private static Boolean indyConstants() {
        return Options.INVOKEDYNAMIC_CACHE_CONSTANTS.load();
    }

    private static Boolean indyInvocationSwitchpoint() {
        return Options.INVOKEDYNAMIC_INVOCATION_SWITCHPOINT.load();
    }

    private static void disableIndy() {
        Options.COMPILE_INVOKEDYNAMIC.force("false");
    }
}