net.hasor.dataql.compiler.cc.FragmentVariableInstCompiler 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.token.StringToken;
import net.hasor.dataql.parser.ast.value.FragmentVariable;
import java.util.List;
import static net.hasor.dataql.compiler.qil.CompilerContext.ContainsIndex;
/**
* Fragment 片段
* @author 赵永春 ([email protected])
* @version : 2017-03-23
*/
public class FragmentVariableInstCompiler implements InstCompiler {
@Override
public void doCompiler(FragmentVariable astInst, InstQueue queue, CompilerContext compilerContext) {
InstQueue newMethodInst = queue.newMethodInst();
List paramList = astInst.getParamList();
boolean isBatch = astInst.isBatchMode();
compilerContext.newFrame();
// .LOCAL 变量表
for (int i = 0; i < paramList.size(); i++) {
StringToken paramToken = paramList.get(i);
String name = paramToken.getValue();
int index = compilerContext.push(name); //将变量名压栈，并返回栈中的位置
instLocation(newMethodInst, paramToken);
newMethodInst.inst(LOCAL, i, index, name); //为栈中某个位置的变量命名
}
// .声明片段入口
StringToken fragmentName = astInst.getFragmentName();
instLocation(newMethodInst, fragmentName);
newMethodInst.inst(M_FRAG, isBatch, fragmentName.getValue());
// .加载入参变量
newMethodInst.inst(NEW_O);
for (StringToken stringToken : paramList) {
String name = stringToken.getValue();
ContainsIndex index = compilerContext.containsWithTree(name);
instLocation(newMethodInst, stringToken);
newMethodInst.inst(LOAD, index.depth, index.index);
newMethodInst.inst(PUT, name);
}
// .最后一个参数是的片段内容
StringToken fragmentToken = astInst.getFragmentString();
instLocation(newMethodInst, fragmentToken);
newMethodInst.inst(LDC_S, fragmentToken.getValue());
// .执行函数调用
instLocation(newMethodInst, astInst);
newMethodInst.inst(CALL, 2);
newMethodInst.inst(RETURN, 0);
compilerContext.dropFrame();
//
// .指向函数的指针
instLocation(queue, astInst);
queue.inst(M_REF, newMethodInst.getName());
}
}