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Dynamic class and method bytecode generator on top of ObjectWeb ASM. An expression-based fluent API abstracts the complexity of direct bytecode manipulation.

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/*
 * Copyright (C) 2020 ActiveJ LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.activej.codegen.expression.impl;

import io.activej.codegen.Context;
import io.activej.codegen.expression.LocalVariable;
import io.activej.common.annotation.ExposedInternals;
import org.jetbrains.annotations.Nullable;
import org.objectweb.asm.Type;
import org.objectweb.asm.commons.GeneratorAdapter;

/**
 * Defines methods which allow to create a local variable
 */
@ExposedInternals
public final class VarLocal implements LocalVariable {
	public static final int VOID = -1;
	public static final VarLocal VAR_LOCAL_VOID = new VarLocal(VOID);

	public final int local;

	public VarLocal(int local) {
		this.local = local;
	}

	@Override
	public Type load(Context ctx) {
		if (local == VOID) return Type.VOID_TYPE;
		GeneratorAdapter g = ctx.getGeneratorAdapter();
		g.loadLocal(local);
		return g.getLocalType(local);
	}

	@Override
	public @Nullable Object beginStore(Context ctx) {
		return null;
	}

	@Override
	public void store(Context ctx, Object storeContext, Type type) {
		if (local == VOID) return;
		GeneratorAdapter g = ctx.getGeneratorAdapter();
		g.storeLocal(local);
	}

	@Override
	public void store(Context ctx) {
		if (local == VOID) return;
		GeneratorAdapter g = ctx.getGeneratorAdapter();
		g.storeLocal(local);
	}
}