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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.passes
import firrtl._
import firrtl.ir._
import firrtl.Utils._
import firrtl.PrimOps._
object seqCat {
def apply(args: Seq[Expression]): Expression = args.length match {
case 0 => error("Empty Seq passed to seqcat")
case 1 => args.head
case 2 => DoPrim(PrimOps.Cat, args, Nil, UIntType(UnknownWidth))
case _ =>
val (high, low) = args splitAt (args.length / 2)
DoPrim(PrimOps.Cat, Seq(seqCat(high), seqCat(low)), Nil, UIntType(UnknownWidth))
}
}
object toBits {
def apply(e: Expression): Expression = e match {
case ex @ (_: WRef | _: WSubField | _: WSubIndex) => hiercat(ex, ex.tpe)
case t => error("Invalid operand expression for toBits!")
}
private def hiercat(e: Expression, dt: Type): Expression = dt match {
case t: VectorType => seqCat((0 until t.size) map (i =>
hiercat(WSubIndex(e, i, t.tpe, UNKNOWNGENDER),t.tpe)))
case t: BundleType => seqCat(t.fields map (f =>
hiercat(WSubField(e, f.name, f.tpe, UNKNOWNGENDER), f.tpe)))
case t: GroundType => e
case t => error("Unknown type encountered in toBits!")
}
}
// TODO: make easier to understand
object toBitMask {
def apply(e: Expression, dataType: Type): Expression = e match {
case ex @ (_: WRef | _: WSubField | _: WSubIndex) => hiermask(ex, ex.tpe, dataType)
case t => error("Invalid operand expression for toBits!")
}
private def hiermask(e: Expression, maskType: Type, dataType: Type): Expression =
(maskType, dataType) match {
case (mt: VectorType, dt: VectorType) =>
seqCat((0 until mt.size).reverse map { i =>
hiermask(WSubIndex(e, i, mt.tpe, UNKNOWNGENDER), mt.tpe, dt.tpe)
})
case (mt: BundleType, dt: BundleType) =>
seqCat((mt.fields zip dt.fields) map { case (mf, df) =>
hiermask(WSubField(e, mf.name, mf.tpe, UNKNOWNGENDER), mf.tpe, df.tpe)
})
case (mt: UIntType, dt: GroundType) =>
seqCat(List.fill(bitWidth(dt).intValue)(e))
case (mt, dt) => error("Invalid type for mask component!")
}
}
object getWidth {
def apply(t: Type): Width = t match {
case t: GroundType => t.width
case _ => error("No width!")
}
def apply(e: Expression): Width = apply(e.tpe)
}
object bitWidth {
def apply(dt: Type): BigInt = widthOf(dt)
private def widthOf(dt: Type): BigInt = dt match {
case t: VectorType => t.size * bitWidth(t.tpe)
case t: BundleType => t.fields.map(f => bitWidth(f.tpe)).foldLeft(BigInt(0))(_+_)
case GroundType(IntWidth(width)) => width
case t => error("Unknown type encountered in bitWidth!")
}
}
object fromBits {
def apply(lhs: Expression, rhs: Expression): Statement = {
val fbits = lhs match {
case ex @ (_: WRef | _: WSubField | _: WSubIndex) => getPart(ex, ex.tpe, rhs, 0)
case _ => error("Invalid LHS expression for fromBits!")
}
Block(fbits._2)
}
private def getPartGround(lhs: Expression,
lhst: Type,
rhs: Expression,
offset: BigInt): (BigInt, Seq[Statement]) = {
val intWidth = bitWidth(lhst)
val sel = DoPrim(PrimOps.Bits, Seq(rhs), Seq(offset + intWidth - 1, offset), UnknownType)
(offset + intWidth, Seq(Connect(NoInfo, lhs, sel)))
}
private def getPart(lhs: Expression,
lhst: Type,
rhs: Expression,
offset: BigInt): (BigInt, Seq[Statement]) =
lhst match {
case t: VectorType => (0 until t.size foldRight (offset, Seq[Statement]())) {
case (i, (curOffset, stmts)) =>
val subidx = WSubIndex(lhs, i, t.tpe, UNKNOWNGENDER)
val (tmpOffset, substmts) = getPart(subidx, t.tpe, rhs, curOffset)
(tmpOffset, stmts ++ substmts)
}
case t: BundleType => (t.fields foldRight (offset, Seq[Statement]())) {
case (f, (curOffset, stmts)) =>
val subfield = WSubField(lhs, f.name, f.tpe, UNKNOWNGENDER)
val (tmpOffset, substmts) = getPart(subfield, f.tpe, rhs, curOffset)
(tmpOffset, stmts ++ substmts)
}
case t: GroundType => getPartGround(lhs, t, rhs, offset)
case t => error("Unknown type encountered in fromBits!")
}
}
object createMask {
def apply(dt: Type): Type = dt match {
case t: VectorType => VectorType(apply(t.tpe), t.size)
case t: BundleType => BundleType(t.fields map (f => f copy (tpe=apply(f.tpe))))
case t: UIntType => BoolType
case t: SIntType => BoolType
}
}
object createRef {
def apply(n: String, t: Type = UnknownType, k: Kind = ExpKind) = WRef(n, t, k, UNKNOWNGENDER)
}
object createSubField {
def apply(exp: Expression, n: String) = WSubField(exp, n, field_type(exp.tpe, n), UNKNOWNGENDER)
}
object connectFields {
def apply(lref: Expression, lname: String, rref: Expression, rname: String) =
Connect(NoInfo, createSubField(lref, lname), createSubField(rref, rname))
}
object flattenType {
def apply(t: Type) = UIntType(IntWidth(bitWidth(t)))
}
object MemPortUtils {
type MemPortMap = collection.mutable.HashMap[String, Expression]
type Memories = collection.mutable.ArrayBuffer[DefMemory]
type Modules = collection.mutable.ArrayBuffer[DefModule]
def defaultPortSeq(mem: DefMemory) = Seq(
Field("addr", Default, UIntType(IntWidth(ceilLog2(mem.depth) max 1))),
Field("en", Default, BoolType),
Field("clk", Default, ClockType)
)
// Todo: merge it with memToBundle
def memType(mem: DefMemory) = {
val rType = BundleType(defaultPortSeq(mem) :+
Field("data", Flip, mem.dataType))
val wType = BundleType(defaultPortSeq(mem) ++ Seq(
Field("data", Default, mem.dataType),
Field("mask", Default, createMask(mem.dataType))))
val rwType = BundleType(defaultPortSeq(mem) ++ Seq(
Field("rdata", Flip, mem.dataType),
Field("wmode", Default, BoolType),
Field("wdata", Default, mem.dataType),
Field("wmask", Default, createMask(mem.dataType))))
BundleType(
(mem.readers map (Field(_, Flip, rType))) ++
(mem.writers map (Field(_, Flip, wType))) ++
(mem.readwriters map (Field(_, Flip, rwType))))
}
def memPortField(s: DefMemory, p: String, f: String) = {
val mem = WRef(s.name, memType(s), MemKind, UNKNOWNGENDER)
val t1 = field_type(mem.tpe, p)
val t2 = field_type(t1, f)
WSubField(WSubField(mem, p, t1, UNKNOWNGENDER), f, t2, UNKNOWNGENDER)
}
}
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