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// SPDX-License-Identifier: Apache-2.0
package firrtl.annotations
import java.io.File
import firrtl.FirrtlUserException
/** Representation of the two types of `readmem` statements available in Verilog.
*/
sealed abstract class MemoryLoadFileType(val value: String) {
def serialize: String = value
}
object MemoryLoadFileType {
// purely for backwards compatibility with chisel3's ChiselLoadMemoryAnnotation
type FileType = MemoryLoadFileType
case object Hex extends MemoryLoadFileType("h")
case object Binary extends MemoryLoadFileType("b")
def deserialize(s: String): MemoryLoadFileType = s match {
case "h" => MemoryLoadFileType.Hex
case "b" => MemoryLoadFileType.Binary
case _ => throw new FirrtlUserException(s"Unrecognized MemoryLoadFileType: $s")
}
}
/** Firrtl implementation for load memory
* @param target memory to load
* @param fileName name of input file
* @param hexOrBinary use `\$readmemh` or `\$readmemb`
*/
case class LoadMemoryAnnotation(
target: ComponentName,
fileName: String,
hexOrBinary: MemoryLoadFileType = MemoryLoadFileType.Hex,
originalMemoryNameOpt: Option[String] = None)
extends SingleTargetAnnotation[Named] {
val (prefix, suffix) = {
fileName.split("""\.""").toList match {
case Nil =>
throw new Exception(s"empty filename not allowed in LoadMemoryAnnotation")
case name :: Nil =>
(name, "")
case "" :: name :: Nil => // this case handles a filename that begins with dot and has no suffix
("." + name, "")
case other => {
if (other.last.indexOf(File.separator) != -1) {
(fileName, "")
} else {
(other.reverse.tail.reverse.mkString("."), "." + other.last)
}
}
}
}
def getPrefix: String =
prefix + originalMemoryNameOpt.map(n => target.name.drop(n.length)).getOrElse("")
def getSuffix: String = suffix
def getFileName: String = getPrefix + getSuffix
def duplicate(newNamed: Named): LoadMemoryAnnotation = {
newNamed match {
case componentName: ComponentName =>
this.copy(target = componentName, originalMemoryNameOpt = Some(target.name))
case _ =>
throw new Exception(s"Cannot annotate anything but a memory, invalid target ${newNamed.serialize}")
}
}
}
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