io.micronaut.sourcegen.bytecode.expression.VariableExpressionWriter Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of micronaut-sourcegen-bytecode-writer Show documentation
Micronaut SourceGen exposes a language-neutral API for source code generation.
There is a newer version: 1.5.3
Show newest version
/*
 * Copyright 2017-2024 original authors
 *
 * 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
 *
 * https://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.micronaut.sourcegen.bytecode.expression;

import io.micronaut.sourcegen.bytecode.MethodContext;
import io.micronaut.sourcegen.bytecode.TypeUtils;
import io.micronaut.sourcegen.bytecode.statement.TryCatchStatementWriter;
import io.micronaut.sourcegen.model.ParameterDef;
import io.micronaut.sourcegen.model.TypeDef;
import io.micronaut.sourcegen.model.VariableDef;
import org.objectweb.asm.commons.GeneratorAdapter;

final class VariableExpressionWriter implements ExpressionWriter {
    private final VariableDef variableDef;

    public VariableExpressionWriter(VariableDef variableDef) {
        this.variableDef = variableDef;
    }

    @Override
    public void write(GeneratorAdapter generatorAdapter, MethodContext context) {
        if (variableDef instanceof VariableDef.ExceptionVar) {
            MethodContext.LocalData localData = context.locals().get(TryCatchStatementWriter.EXCEPTION_NAME);
            generatorAdapter.loadLocal(localData.index(), localData.type());
            return;
        }
        if (variableDef instanceof VariableDef.Local localVariableDef) {
            MethodContext.LocalData localData = context.locals().get(localVariableDef.name());
            generatorAdapter.loadLocal(localData.index(), localData.type());
            return;
        }
        if (variableDef instanceof VariableDef.MethodParameter parameterVariableDef) {
            if (context.methodDef() == null) {
                throw new IllegalStateException("Accessing method parameters is not available");
            }
            ParameterDef parameterDef = context.methodDef().getParameters().stream().filter(p -> p.getName().equals(parameterVariableDef.name())).findFirst().orElseThrow();
            int parameterIndex = context.methodDef().getParameters().indexOf(parameterDef);
            generatorAdapter.loadArg(parameterIndex);
            return;
        }
        if (variableDef instanceof VariableDef.StaticField field) {
            TypeDef owner = field.ownerType();
            TypeDef fieldType = field.type();

            generatorAdapter.getStatic(TypeUtils.getType(owner, context.objectDef()), field.name(), TypeUtils.getType(fieldType, context.objectDef()));
            return;
        }
        if (variableDef instanceof VariableDef.Field field) {

            ExpressionWriter.writeExpression(generatorAdapter, context, field.instance());
            TypeDef fieldType = field.type();
            TypeDef owner = field.instance().type();
            generatorAdapter.getField(TypeUtils.getType(owner, context.objectDef()), field.name(), TypeUtils.getType(fieldType, context.objectDef()));
            return;
        }
        if (variableDef instanceof VariableDef.This) {
            if (context.objectDef() == null) {
                throw new IllegalStateException("Accessing 'this' is not available");
            }
            generatorAdapter.loadThis();
            return;
        }
        if (variableDef instanceof VariableDef.Super) {
            if (context.objectDef() == null) {
                throw new IllegalStateException("Accessing 'super' is not available");
            }
            generatorAdapter.loadThis();
            return;
        }
        throw new UnsupportedOperationException("Unrecognized variable: " + variableDef);
    }
}