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package org.jruby.compiler;

import org.jruby.Ruby;
import org.jruby.ast.util.SexpMaker;
import org.jruby.ir.IRClosure;
import org.jruby.ir.IRMethod;
import org.jruby.ir.targets.JVMVisitor;
import org.jruby.ir.targets.JVMVisitorMethodContext;
import org.jruby.parser.StaticScope;
import org.jruby.runtime.ArgumentDescriptor;
import org.jruby.runtime.CompiledIRBlockBody;
import org.jruby.runtime.MixedModeIRBlockBody;

import static org.jruby.compiler.MethodJITTask.*;

class BlockJITTask extends JITCompiler.Task {

    private final String className;
    private final MixedModeIRBlockBody body;
    private final String blockId;
    private final String methodName;

    public BlockJITTask(JITCompiler jitCompiler, MixedModeIRBlockBody body, String className) {
        super(jitCompiler);
        this.body = body;
        this.className = className;
        this.blockId = body.getName();
        IRMethod method = body.getIRScope().getNearestMethod();
        this.methodName = method != null ? method.getByteName().toString() : null;
    }

    @Override
    public void exec() throws NoSuchMethodException, IllegalAccessException {
        // Check if the method has been explicitly excluded
        String excludeModuleName = checkExcludedMethod(jitCompiler.config, className, methodName, body);
        if (excludeModuleName != null) {
            body.setCallCount(-1);
            if (jitCompiler.config.isJitLogging()) {
                JITCompiler.log(body, blockId, "skipping block in " + excludeModuleName);
            }
            return;
        }

        IRClosure closure = body.getScope();
        StaticScope scope = closure.getStaticScope();
        final String key = SexpMaker.sha1(closure);
        final Ruby runtime = jitCompiler.runtime;
        JVMVisitor visitor = JVMVisitor.newForJIT(runtime);
        BlockJITClassGenerator generator = new BlockJITClassGenerator(className, blockId, key, runtime, body, visitor);

        JVMVisitorMethodContext context = new JVMVisitorMethodContext();
        generator.compile(context);

        Class sourceClass = defineClass(generator, visitor, closure, body.ensureInstrsReady());
        if (sourceClass == null) return; // class could not be found nor generated; give up on JIT and bail out

        // successfully got back a jitted body
        String jittedName = context.getVariableName();

        // blocks only have variable-arity
        body.completeBuild(
                new CompiledIRBlockBody(
                        JITCompiler.PUBLIC_LOOKUP.findStatic(sourceClass, jittedName, JVMVisitor.CLOSURE_SIGNATURE.type()),
                        scope,
                        closure.getFile(),
                        closure.getLine(),
                        ArgumentDescriptor.encode(closure.getArgumentDescriptors()),
                        ((IRClosure) body.getIRScope()).getSignature().encode()));
    }

    @Override
    protected String getSourceFile() {
        return body.getFile();
    }

    @Override
    protected void logJitted() {
        logImpl("block done jitting");
    }

    @Override
    protected void logFailed(final Throwable ex) {
        logImpl("could not compile block; passes run: " + body.getIRScope().getExecutedPasses(), ex);
    }

    @Override
    protected void logImpl(final String message, Object... reason) {
        JITCompiler.log(body, blockId, message, reason);
    }

}