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// See LICENSE for license details.
package chiselTests
import chisel3._
import chisel3.testers.BasicTester
import chisel3.experimental.RawModule
import chisel3.experimental.BundleLiterals._
import chisel3.core.BundleLiteralException
class BundleLiteralSpec extends ChiselFlatSpec {
class MyBundle extends Bundle {
val a = UInt(8.W)
val b = Bool()
}
"bundle literals" should "work in RTL" in {
val outsideBundleLit = (new MyBundle).Lit(_.a -> 42.U, _.b -> true.B)
assertTesterPasses{ new BasicTester{
// TODO: add direct bundle compare operations, when that feature is added
chisel3.assert(outsideBundleLit.a === 42.U)
chisel3.assert(outsideBundleLit.b === true.B)
val bundleLit = (new MyBundle).Lit(_.a -> 42.U, _.b -> true.B)
chisel3.assert(bundleLit.a === 42.U)
chisel3.assert(bundleLit.b === true.B)
chisel3.assert(bundleLit.a === outsideBundleLit.a)
chisel3.assert(bundleLit.b === outsideBundleLit.b)
val bundleWire = Wire(new MyBundle)
bundleWire := outsideBundleLit
chisel3.assert(bundleWire.a === 42.U)
chisel3.assert(bundleWire.b === true.B)
stop()
} }
}
"partial bundle literals" should "work in RTL" in {
assertTesterPasses{ new BasicTester{
val bundleLit = (new MyBundle).Lit(_.a -> 42.U)
chisel3.assert(bundleLit.a === 42.U)
val bundleWire = Wire(new MyBundle)
bundleWire := bundleLit
chisel3.assert(bundleWire.a === 42.U)
stop()
} }
}
class MyOuterBundle extends Bundle {
val a = new MyBundle
val b = new Bundle {
val c = Bool()
val d = UInt(8.W)
}
}
"contained bundles" should "work" in {
assertTesterPasses{ new BasicTester{
// Specify the inner Bundle value as a Bundle literal
val explicitBundleLit = (new MyOuterBundle).Lit(
_.a -> (new MyBundle).Lit(_.a -> 42.U, _.b -> true.B)
)
chisel3.assert(explicitBundleLit.a.a === 42.U)
chisel3.assert(explicitBundleLit.a.b === true.B)
// Specify the inner Bundle fields directly
val expandedBundleLit = (new MyOuterBundle).Lit(
_.a.a -> 42.U, _.a.b -> true.B,
_.b.c -> false.B, _.b.d -> 255.U
)
chisel3.assert(expandedBundleLit.a.a === 42.U)
chisel3.assert(expandedBundleLit.a.b === true.B)
chisel3.assert(expandedBundleLit.b.c === false.B)
chisel3.assert(expandedBundleLit.b.d === 255.U)
// Anonymously contruct the inner Bundle literal
// A bit of weird syntax that depends on implementation details of the Bundle literal constructor
val childBundleLit = (new MyOuterBundle).Lit(
b => b.b -> b.b.Lit(_.c -> false.B, _.d -> 255.U)
)
chisel3.assert(childBundleLit.b.c === false.B)
chisel3.assert(childBundleLit.b.d === 255.U)
stop()
} }
}
"Bundle literals" should "assign" in {
assertTesterPasses{ new BasicTester{
val bundleWire = Wire(Output(new MyBundle))
val bundleLit = (new MyBundle).Lit(_.a -> 42.U, _.b -> true.B)
bundleWire := bundleLit
chisel3.assert(bundleWire.a === 42.U)
chisel3.assert(bundleWire.b === true.B)
stop()
} }
}
"partially initialized Bundle literals" should "assign" in {
assertTesterPasses{ new BasicTester{
val bundleWire = Wire(Output(new MyBundle))
val bundleLit = (new MyBundle).Lit(_.a -> 42.U)
bundleWire := bundleLit
chisel3.assert(bundleWire.a === 42.U)
stop()
} }
}
"bundle literals with bad field specifiers" should "fail" in {
val exc = intercept[BundleLiteralException] { elaborate { new RawModule {
val bundle = new MyBundle
bundle.Lit(x => bundle.a -> 0.U) // DONT DO THIS, this gets past a syntax error to exercise the failure
}}}
exc.getMessage should include ("not a field")
}
"bundle literals with duplicate fields" should "fail" in {
val exc = intercept[BundleLiteralException] { elaborate { new RawModule {
(new MyBundle).Lit(_.a -> 0.U, _.a -> 0.U)
}}}
exc.getMessage should include ("duplicate")
exc.getMessage should include (".a")
}
"bundle literals with non-literal values" should "fail" in {
val exc = intercept[BundleLiteralException] { elaborate { new RawModule {
(new MyBundle).Lit(_.a -> UInt())
}}}
exc.getMessage should include ("non-literal value")
exc.getMessage should include (".a")
}
"bundle literals with non-type-equivalent element fields" should "fail" in {
val exc = intercept[BundleLiteralException] { elaborate { new RawModule {
(new MyBundle).Lit(_.a -> true.B)
}}}
exc.getMessage should include ("non-type-equivalent value")
exc.getMessage should include (".a")
}
"bundle literals with non-type-equivalent sub-bundles" should "fail" in {
val exc = intercept[BundleLiteralException] { elaborate { new RawModule {
(new MyOuterBundle).Lit(_.b -> (new MyBundle).Lit(_.a -> 0.U))
}}}
exc.getMessage should include ("non-type-equivalent value")
exc.getMessage should include (".b")
}
}
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