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
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/* $Id$
*
* Copyright (C) 2007-2009 FAUmachine Team <info@faumachine.org>.
* This program is free software. You can redistribute it and/or modify it
* under the terms of the GNU General Public License, either version 2 of
* the License, or (at your option) any later version. See COPYING.
*/
#ifndef __CONSTANT_DECLARATION_HPP_INCLUDED
#define __CONSTANT_DECLARATION_HPP_INCLUDED
#include "frontend/ast/ValDeclaration.hpp"
#include "frontend/visitor/Visitor.hpp"
#include "frontend/ast/Expression.hpp"
namespace ast {
//! A VHDL constant declaration.
/** This class represents a declaration of a VHDL constant.
* A constant must never be target of an assignment statement.
* (it can change though, e.g. the loop parameter of an iteration scheme).
*/
class ConstantDeclaration : public ValDeclaration {
public:
/** c'tor
* @param declName the declared name
* @param varInit initializer Expression for the constant.
* @param subtype subtype indication of the constant.
* @param fValue has the constant a fixed value?
* @param loc location of the ConstantDeclaration.
*/
ConstantDeclaration(
std::string* declName,
Expression* varInit,
SubtypeIndication* subtype,
bool fValue,
Location loc
) : ValDeclaration(ValDeclaration::MODE_IN,
declName,
varInit,
subtype,
ValDeclaration::OBJ_CLASS_CONSTANT,
loc),
fixedValue(fValue) {}
//! Accept a Visitor.
/** All leaf AST nodes need to implement this method.
*
* @param visitor the Visitor that can visit this node.
*/
virtual void accept(Visitor& visitor) {
visitor.visit(*this);
}
/** Put a textual representation of the AstNode on the stream.
* @param stream stream to put the textual representation to.
*/
virtual void put(std::ostream &stream) const {
assert(this->name != NULL);
stream << "CONSTANT " << *this->name << " : "
<< this->subtypeIndic;
if (this->init != NULL) {
stream << " := " << *this->init;
}
stream << ';';
}
/** true, if the constant will always evaluate to the same value. */
bool fixedValue;
};
}; /* namespace ast */
#endif /* __CONSTANT_DECLARATION_HPP_INCLUDED */
|
