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/**
* 该类用于表示声明的类
*/
package minijava.symboltable;
import minijava.minijava2piglet.PigletBinding;
import minijava.minijava2piglet.PigletTemp;
import minijava.typecheck.PrintError;
public class MClass extends MLocalVarType {
public MClasses all_classes; // 所有类的列表，在建立符号表时完成
public boolean isDeclared = false; // 是否已声明，用于检查符号表
public String extend_class_name = null; // 所继承的类名
public MClass extend_class = null; // 所继承的类，在符号表建立完成后才能求得
public int extend_tag = 0; // 检测循环继承时用，0表示未检测
public MMethodList methods;
public MClass(String v_name, MClasses all, int m_line, int m_column) {
super(m_line, m_column);
name = v_name;
all_classes = all;
methods = new MMethodList();
}
public String insertVar(MVariable var) {
String var_name = var.getName();
if (vars.findVar(var_name)!=-1) {
return "Variable double declaration " + "\"" + var_name + "\"";
}
vars.insertVar(var);
return null;
}
public String insertMethod(MMethod method) {
String method_name = method.getName();
if (vars.findVar(method_name)!=-1) {
return "Method name \'" + method_name + "\' is the same of some variable.";
}
if (methods.findMethod(method_name)!=-1) {
return "Method double declaration " + "\"" + method_name + "\".";
}
methods.addMethod(method);
method.method_class = this;
return null;
}
public MMethod findMethodByName(String m) {
int idx = methods.findMethod(m);
if (idx==-1) {
return null;
} else {
return methods.methods.elementAt(idx);
}
}
public PigletBinding getVarBinding(String v_name) {
int prev_vars = 0;
for (MClass c=extend_class; c!=null; c=c.extend_class) {
prev_vars += c.vars.size();
}
int idx = vars.findVar(v_name);
if (idx!=-1) {
String tmp = PigletTemp.newTmp();
PigletBinding ret = new PigletBinding(null, null);
ret.read = "\nBEGIN\nHLOAD " + tmp + " TEMP 0 " + (prev_vars+idx+1)*4
+ "\nRETURN " + tmp + "\nEND";
ret.write = "TEMP 0 " + (prev_vars+idx+1)*4;
return ret;
}
// no such variable, find the parentclss
if (extend_class!=null) {
return extend_class.getVarBinding(v_name);
} else {
return null;
}
}
public int getMethodBinding(String m_name) {
int prev_funcs = 0;
for (MClass c=extend_class; c!=null; c=c.extend_class) {
prev_funcs += c.methods.size();
}
int idx = methods.findMethod(m_name);
if (idx!=-1) {
return (prev_funcs+idx)*4;
} else {
// no such function, find the parentclass
if (extend_class!=null) {
return extend_class.getMethodBinding(m_name);
} else {
return -1;
}
}
}
public String newString() {
int nMethods = 0, nVars = 0;
String result = "";
String t_methods = PigletTemp.newTmp();
String t_vars = PigletTemp.newTmp();
for (MClass c=this; c!=null; c=c.extend_class) {
nMethods += c.methods.size();
nVars += c.vars.size();
}
result += "\nBEGIN\nMOVE " + t_methods + " HALLOCATE " + nMethods*4
+ "\nMOVE " + t_vars + " HALLOCATE " + (nVars+1)*4 + "\n";
// store all methods
for (MClass c=this; c!=null; c=c.extend_class) {
for (int i=c.methods.size()-1; i>=0; i--) {
--nMethods;
result += "HSTORE " + t_methods + " " + nMethods*4 + " "
+ c.getName() + "_"
+ c.methods.methods.elementAt(i).getName()
+ "\n";
}
}
result += "HSTORE " + t_vars + " 0 " + t_methods + "\n";
result += "RETURN " + t_vars + "\nEND";
return result;
}
// 检测类型名是否有效
public boolean validType(String s_type) {
if (s_type==MIdentifier.intType
|| s_type==MIdentifier.boolType
|| s_type==MIdentifier.arrType
|| s_type==MIdentifier.voidType
|| s_type==MIdentifier.sArrayType) {
return true;
}
if (all_classes.findClassByName(s_type)!=null) {
return true;
}
return false;
}
// 对类进行类型检查
public boolean classVarCheck() {
boolean result = true;
for (int i=0; i<methods.size(); i++) {
result &= methods.methods.elementAt(i).validVars();
}
return result;
}
public boolean classFuncCheck() {
boolean result = true;
for (int i=0; i<methods.size(); i++) {
result &= methods.methods.elementAt(i).validFunc();
}
return result;
}
public void classStatementCheck() {
for (int i=0; i<methods.size(); i++) {
methods.methods.elementAt(i).checkStatements();
}
}
// 调试输出: 打印该类的信息
public void printClass(int spaces) {
String ps = OutputFormat.spaces(spaces);
if (this.extend_class_name!=null) {
System.err.println(ps + "Class "+this.name+" extends "+this.extend_class_name);
} else {
System.err.println(ps + "Class "+this.name);
}
for (int i=0; i<vars.size(); i++) {
vars.varlist.elementAt(i).printVar(spaces+2);
System.err.println();
}
for (int i=0; i<methods.size(); i++) {
methods.methods.elementAt(i).printMethod(spaces+2);
}
}
}
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