net.hasor.dataql.compiler.cc.VarInstCompiler Maven / Gradle / Ivy
/*
* Copyright 2008-2009 the original author or 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
*
* 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 net.hasor.dataql.compiler.cc;
import net.hasor.dataql.compiler.qil.CompilerContext;
import net.hasor.dataql.compiler.qil.InstCompiler;
import net.hasor.dataql.compiler.qil.InstQueue;
import net.hasor.dataql.parser.ast.Variable;
import net.hasor.dataql.parser.ast.inst.VarInst;
import net.hasor.dataql.parser.ast.token.StringToken;
/**
* var指令
* @author 赵永春 ([email protected])
* @version : 2017-03-23
*/
public class VarInstCompiler implements InstCompiler {
@Override
public void doCompiler(VarInst astInst, InstQueue queue, CompilerContext compilerContext) {
// .如果当前堆栈中存在该变量的定义，那么直接覆盖。否则新增一个本地变量
StringToken varNameToken = astInst.getVarName();
String varName = varNameToken.getValue();
int index = compilerContext.containsWithCurrent(varName);
if (index < 0) {
index = compilerContext.push(varName);
}
//
// .编译表达式
Variable varValue = astInst.getValue();
compilerContext.findInstCompilerByInst(varValue).doCompiler(queue);
//
instLocation(queue, varNameToken);
queue.inst(STORE, index);
}
}