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// See LICENSE for license details.
package chisel3.core
import scala.reflect.macros.blackbox.Context
import scala.language.experimental.macros
import chisel3.internal._
import chisel3.internal.Builder.pushCommand
import chisel3.internal.firrtl._
import chisel3.internal.sourceinfo.SourceInfo
object assert { // scalastyle:ignore object.name
/** Checks for a condition to be valid in the circuit at all times. If the
* condition evaluates to false, the circuit simulation stops with an error.
*
* Does not fire when in reset (defined as the encapsulating Module's
* reset). If your definition of reset is not the encapsulating Module's
* reset, you will need to gate this externally.
*
* May be called outside of a Module (like defined in a function), so
* functions using assert make the standard Module assumptions (single clock
* and single reset).
*
* @param cond condition, assertion fires (simulation fails) when false
* @param message optional message to print when the assertion fires
*
* @note currently cannot be used in core Chisel / libraries because macro
* defs need to be compiled first and the SBT project is not set up to do
* that
*/
// Macros currently can't take default arguments, so we need two functions to emulate defaults.
def apply(cond: Bool, message: String)(implicit sourceInfo: SourceInfo): Unit = macro apply_impl_msg
def apply(cond: Bool)(implicit sourceInfo: SourceInfo): Unit = macro apply_impl
def apply_impl_msg(c: Context)(cond: c.Tree, message: c.Tree)(sourceInfo: c.Tree): c.Tree = {
import c.universe._
val p = c.enclosingPosition
val condStr = s"${p.source.file.name}:${p.line} ${p.lineContent.trim}"
val apply_impl_do = symbolOf[this.type].asClass.module.info.member(TermName("apply_impl_do"))
q"$apply_impl_do($cond, $condStr, _root_.scala.Some($message))($sourceInfo)"
}
def apply_impl(c: Context)(cond: c.Tree)(sourceInfo: c.Tree): c.Tree = {
import c.universe._
val p = c.enclosingPosition
val condStr = s"${p.source.file.name}:${p.line} ${p.lineContent.trim}"
val apply_impl_do = symbolOf[this.type].asClass.module.info.member(TermName("apply_impl_do"))
q"$apply_impl_do($cond, $condStr, _root_.scala.None)($sourceInfo)"
}
def apply_impl_do(cond: Bool, line: String, message: Option[String])(implicit sourceInfo: SourceInfo) {
when (!(cond || Builder.forcedModule.reset)) {
message match {
case Some(str) => printf.printfWithoutReset(s"Assertion failed: $str\n at $line\n")
case None => printf.printfWithoutReset(s"Assertion failed\n at $line\n")
}
pushCommand(Stop(sourceInfo, Node(Builder.forcedModule.clock), 1))
}
}
/** An elaboration-time assertion, otherwise the same as the above run-time
* assertion. */
def apply(cond: Boolean, message: => String) {
Predef.assert(cond, message)
}
/** A workaround for default-value overloading problems in Scala, just
* 'assert(cond, "")' */
def apply(cond: Boolean) {
Predef.assert(cond, "")
}
}
object stop { // scalastyle:ignore object.name
/** Terminate execution with a failure code. */
def apply(code: Int)(implicit sourceInfo: SourceInfo): Unit = {
when (!Builder.forcedModule.reset) {
pushCommand(Stop(sourceInfo, Node(Builder.forcedModule.clock), code))
}
}
/** Terminate execution, indicating success. */
def apply()(implicit sourceInfo: SourceInfo): Unit = {
stop(0)
}
}
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