public void setAddr(int addr, int pos)
{
record temp = table[pos];
temp.address = addr;
table[pos] = temp;
}
public int[] dx = new int[4]; //层次入口数组
public symbol_table(Compiler C)
{
compiler = C;
point = 0;
dx[0] = 0;
record stentry = new record();
stentry.name = "";
stable.Add(stentry);
}
/*向符号表中添加一条记录*/
public void tableFill(String name, int type, int value, int level, int dx)
{
tablePtr++;
record rec = new record();
rec.name = name;
rec.type = type;
rec.value = value;
rec.level = level;
rec.address = dx;
table.Add(rec);
}
//添加到符号表中
public void add(symlist sym)
{
syntax_Analysis sa = compiler.sa;
if (sa.level > point)
{
point++;
dx[point] = dx[point - 1];
}
else if (sa.level < point)
{
//int delnum = dx[point] - dx[point - 1];
//for (int i = 0; i < delnum; i++)
// stable.RemoveAt(stable.Count - 1);
//point--;
}
dx[point]++;
record re = new record();
re.name = compiler.la.word;
if (sym == symlist.constsym)
{
re.kind = "constant";
re.val = compiler.la.num;
stable.Add(re);
}
else if (sym == symlist.varsym)
{
re.kind = "variable";
re.level = sa.level;
//获取地址还没写re.adr =
re.adr = compiler.sa.getadd();
stable.Add(re);
}
else if (sym == symlist.proceduresym)
{
re.kind = "procedure";
re.level = sa.level;
stable.Add(re);
}
}
//<因子> ::= <标识符>|<无符号整数>|'('<表达式>')'
public void factor(List <symlist> followlst)
{
Pcode pc = compiler.pc;
List <symlist> nextlst = new List <symlist>();
symbol_table st = compiler.st;
lexical_analysis la = compiler.la;
Error er = compiler.error;
int index;
nextlst.AddRange(factorSymSet);
check(nextlst, followlst, 24);
while (factorSymSet.Contains(sym))
{
if (sym == symlist.iden)
{
index = st.position(la.word);
if (index == -1)
{
er.adderror(11);
}
else
{
record re = st.stable[index];
string kind = re.kind;
if (kind == "constant")
{
pc.gen("LIT", 0, re.val);
}
else if (kind == "variable")
{
int l = level - re.level;
int a = re.adr;
pc.gen("LOD", l, a);
}
else
{
er.adderror(21);
}
}
getsym();
}
else if (sym == symlist.number)
{
pc.gen("LIT", 0, la.num);
getsym();
}
else if (sym == symlist.LParenthesis)
{
getsym();
followlst.Add(symlist.RParenthesis);
expression(followlst);
if (sym == symlist.RParenthesis)
{
getsym();
}
else
{
er.adderror(22);
} //error
}
check(followlst, factorSymSet, 23);
}
}
