compiler/Symbol_table.py at main · shekharkadyan/compiler · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
class Node:
    def __init__(self, type = None , value = None, children = None, leaf = None, code = None):
         self.type = type
         self.value = value
         if children:
              self.children = children
         else:
              self.children = [ ]
         if leaf:
              self.leaf = leaf
         else:
              self.leaf = [ ]

    def gettype(self):
        return self.type

    def getvalue(self):
        return self.value

class ArrayEntry(object):
    def __init__(self, id = '', type='', offset = 0, size = 0):
        self.id = id
        self.type = type
        self.offset = offset
        self.size = size

class VarEntry(object):
    def __init__(self, id = '' , type = '', offset = 0, size):
        self.id = id
        self.type = type
        self.offset = offset
	self.size = size

#procName is the lexeme of the procedure
class ProcEntry(object):
    def __init__(self, procName='',type = [], returnType='' , pointer=None, forwardDeclaration = False):#pointer is pointer to symbol table of proc name
        self.procName = procName;
        self.type = type;
        self.returnType = returnType;
        self.pointer = pointer;
        self.forwardDeclaration = forwardDeclaration


class SymbTable(object):
    def __init__(self, parent, offset = 0):
        self.parent = parent
	self.entries = {}
	self.offset = offset

    def lookup(self, entry):
        if entry in self.entries:
            return self.entries[entry]
	elif self.parent == None:
	    return None
        else:
            self.parent.lookup(entry)

    def insert(self, entry):
        if entry in self.entries:
            print "ERROR: Redefination of variable",entry.id
            return 0
        else:
            self.entries[entry.id] = entry