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/*
Copyright (c) 2014 - 2016 The Regents of the University of
California (Regents). All Rights Reserved. Redistribution and use in
source and binary forms, with or without modification, are permitted
provided that the following conditions are met:
* Redistributions of source code must retain the above
copyright notice, this list of conditions and the following
two paragraphs of disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
two paragraphs of disclaimer in the documentation and/or other materials
provided with the distribution.
* Neither the name of the Regents nor the names of its contributors
may be used to endorse or promote products derived from this
software without specific prior written permission.
IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
REGENTS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF
ANY, PROVIDED HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION
TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR
MODIFICATIONS.
*/
package firrtl
import scala.collection.mutable.HashSet
import firrtl.ir._
import Mappers._
class Namespace private {
private val tempNamePrefix: String = "GEN"
// Begin with a tempNamePrefix in namespace so we always have a number suffix
private val namespace = HashSet[String](tempNamePrefix)
private var n = 0L
def tryName(value: String): Boolean = {
if (!namespace.contains(value)) {
namespace += value
true
} else {
false
}
}
def newName(value: String): String = {
var str = value
while (!tryName(str)) {
str = s"${value}_$n"
n += 1
}
str
}
def newTemp: String = newName(tempNamePrefix)
}
object Namespace {
def apply(): Namespace = new Namespace
// Initializes a namespace from a Module
def apply(m: DefModule): Namespace = {
val namespace = new Namespace
def buildNamespaceStmt(s: Statement): Seq[String] = s match {
case s: IsDeclaration => Seq(s.name)
case s: Conditionally => buildNamespaceStmt(s.conseq) ++ buildNamespaceStmt(s.alt)
case s: Block => s.stmts flatMap buildNamespaceStmt
case _ => Nil
}
namespace.namespace ++= (m.ports collect { case dec: IsDeclaration => dec.name })
m match {
case in: Module =>
namespace.namespace ++= buildNamespaceStmt(in.body)
case _ => // Do nothing
}
namespace
}
/** Initializes a [[Namespace]] for [[ir.Module]] names in a [[ir.Circuit]] */
def apply(c: Circuit): Namespace = {
val namespace = new Namespace
c.modules foreach { m =>
namespace.namespace += m.name
}
namespace
}
}
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