org.spongepowered.despector.emitter.bytecode.instruction.BytecodeInstanceMethodInvokeEmitter.java Source code

Introduction

Here is the source code for org.spongepowered.despector.emitter.bytecode.instruction.BytecodeInstanceMethodInvokeEmitter.java

Source

/*
 * The MIT License (MIT)
 *
 * Copyright (c) Despector <https://despector.voxelgenesis.com>
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.spongepowered.despector.emitter.bytecode.instruction;

import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.spongepowered.despector.ast.generic.ClassTypeSignature;
import org.spongepowered.despector.ast.generic.TypeSignature;
import org.spongepowered.despector.ast.stmt.invoke.InstanceMethodInvoke;
import org.spongepowered.despector.emitter.InstructionEmitter;
import org.spongepowered.despector.emitter.bytecode.BytecodeEmitterContext;

public class BytecodeInstanceMethodInvokeEmitter
        implements InstructionEmitter<BytecodeEmitterContext, InstanceMethodInvoke> {

    @Override
    public void emit(BytecodeEmitterContext ctx, InstanceMethodInvoke arg, TypeSignature type) {
        MethodVisitor mv = ctx.getMethodVisitor();
        ctx.emitInstruction(arg.getCallee(), ClassTypeSignature.of(arg.getOwner()));
        for (int i = 0; i < arg.getParameters().length; i++) {
            ctx.emitInstruction(arg.getParameters()[i], null);
        }
        mv.visitMethodInsn(getOpcode(arg.getType()), arg.getOwnerName(), arg.getMethodName(),
                arg.getMethodDescription(), arg.getType() == InstanceMethodInvoke.Type.INTERFACE);
        int delta = -1 - arg.getParameters().length;
        if (!arg.getReturnType().equals("V")) {
            delta++;
        }
        ctx.updateStack(delta);
    }

    public int getOpcode(InstanceMethodInvoke.Type type) {
        switch (type) {
        case INTERFACE:
            return Opcodes.INVOKEINTERFACE;
        case SPECIAL:
            return Opcodes.INVOKESPECIAL;
        case VIRTUAL:
        default:
            return Opcodes.INVOKEVIRTUAL;
        }
    }

}