public override void ExitFactor3(ssuplParser.Factor3Context context)
{
//factor -> ID
string vname = context.ID().GetText();
if (!symtable.Contains(vname))
{
throw new Exception("Undeclared variable: " + vname);
}
string lbl = symtable.Get(vname).location;
VarType vtype = symtable.Get(vname).type;
int vsizeInQuads = SizeForType(vtype) / 8;
ASM asmcode = new ASM();
for (int i = vsizeInQuads - 1; i >= 0; i--)
{
asmcode += $"mov rax,[{lbl}+{i * 8}]";
asmcode += "push qword rax";
}
code.Put(context, asmcode);
typeAttr.Put(context, symtable.Get(vname).type);
}
public override void ExitAssign(ssuplParser.AssignContext context)
{
// assign : ID EQ expr
string vname = context.ID().GetText();
if (!symtable.Contains(vname))
{
throw new Exception("Undeclared variable: " + vname);
}
code.Put(context,
code.Get(context.expr()),
"pop rax",
$"mov [${symtable.Get(vname).location}],rax"
);
}
public override void ExitAssign(ssuplParser.AssignContext context)
{
// assign : ID EQ expr
string vname = context.ID().GetText();
if (symtable.Get(vname).type != type(context.expr()))//invalid input check
{
throw new Exception("Type mismatch");
}
if (!symtable.Contains(vname))
{
throw new Exception("Undeclared variable: " + vname);
}
code.Put(context,
code.Get(context.expr()),
"pop rax",
$"mov [${symtable.Get(vname).location}],rax" //,
//"push rax"
);
}
