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package org.jruby.compiler;

import org.jruby.ast.util.SexpMaker;
import org.jruby.ir.IRClosure;
import org.jruby.ir.targets.JVMVisitor;
import org.jruby.ir.targets.JVMVisitorMethodContext;
import org.jruby.runtime.CompiledIRBlockBody;
import org.jruby.runtime.MixedModeIRBlockBody;
import org.jruby.util.OneShotClassLoader;

class BlockJITTask implements Runnable {
    private JITCompiler jitCompiler;
    private final String className;
    private final MixedModeIRBlockBody body;
    private final String methodName;

    public BlockJITTask(JITCompiler jitCompiler, MixedModeIRBlockBody body, String className) {
        this.jitCompiler = jitCompiler;
        this.body = body;
        this.className = className;
        this.methodName = body.getName();
    }

    public void run() {
        try {
            String key = SexpMaker.sha1(body.getIRScope());
            JVMVisitor visitor = new JVMVisitor();
            BlockJITClassGenerator generator = new BlockJITClassGenerator(className, methodName, key, jitCompiler.runtime, body, visitor);

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

            // FIXME: reinstate active bytecode size check
            // At this point we still need to reinstate the bytecode size check, to ensure we're not loading code
            // that's so big that JVMs won't even try to compile it. Removed the check because with the new IR JIT
            // bytecode counts often include all nested scopes, even if they'd be different methods. We need a new
            // mechanism of getting all body sizes.
            Class sourceClass = visitor.defineFromBytecode(body.getIRScope(), generator.bytecode(), new OneShotClassLoader(jitCompiler.runtime.getJRubyClassLoader()));

            if (sourceClass == null) {
                // class could not be found nor generated; give up on JIT and bail out
                jitCompiler.counts.failCount.incrementAndGet();
                return;
            } else {
                generator.updateCounters(jitCompiler.counts, body.ensureInstrsReady());
            }

            // successfully got back a jitted body

            if (jitCompiler.config.isJitLogging()) {
                JITCompiler.log(body.getImplementationClass(), body.getFile(), body.getLine(), className + "." + methodName, "done jitting");
            }

            String jittedName = context.getVariableName();

            // blocks only have variable-arity
            body.completeBuild(
                    new CompiledIRBlockBody(
                            JITCompiler.PUBLIC_LOOKUP.findStatic(sourceClass, jittedName, JVMVisitor.CLOSURE_SIGNATURE.type()),
                            body.getIRScope(),
                            ((IRClosure) body.getIRScope()).getSignature().encode()));
        } catch (Throwable t) {
            if (jitCompiler.config.isJitLogging()) {
                JITCompiler.log(body.getImplementationClass(), body.getFile(), body.getLine(), className + "." + methodName, "Could not compile; passes run: " + body.getIRScope().getExecutedPasses(), t.getMessage());
                if (jitCompiler.config.isJitLoggingVerbose()) {
                    t.printStackTrace();
                }
            }

            jitCompiler.counts.failCount.incrementAndGet();
        }
    }
}