Add a BuildList utility

src/Libraries/Base3-Misc/BuildList.bs

@@ -0,0 +1,25 @@
+package BuildList where
+
+import List
+
+-- A typeclass used to implement a vector construction function which can take
+-- any number of arguments (>0).
+-- The type parameter `a` is the type of the elements in the list.
+-- The type parameter `r` is the return type of the function, which can be a
+-- list (base case) or a function (recursive case) that takes another element
+-- and returns a new function.
+-- The list here is built in reverse for efficiency, and then reversed.
+class BuildList a r | r -> a where
+  lst' :: List a -> a -> r
+
+instance BuildList a (List a) where
+  lst' l x = reverse $ x :> l
+
+instance (BuildList a r) => BuildList a (a -> r) where
+  lst' l x y = lst' (x :> l) y
+
+-- Example usage:
+-- lst 1 2 3 4 5 => 1 :> 2 :> 3 :> 4 :> 5 :> nil
+-- lst False     => False :> nil
+lst :: (BuildList a r) => a -> r
+lst x = lst' nil x

src/Libraries/Base3-Misc/Misc.bsv

@@ -3,6 +3,7 @@ package Misc;
 import Arbiter::*;
 import BRAM::*;
 import BRAMFIFO::*;
+import BuildList::*;
 import BuildVector::*;
 import BUtils::*;
 import BypassReg::*;

testsuite/bsc.lib/BuildList/BuildList.exp

@@ -0,0 +1,8 @@
+
+# Test functionality
+test_veri_only TestBuildList
+
+# Test type check error messages
+compile_fail TestBuildListFail.bs
+compare_file TestBuildListFail.bs.bsc-out
+

testsuite/bsc.lib/BuildList/Makefile

@@ -0,0 +1,5 @@
+# for "make clean" to work everywhere
+
+CONFDIR = $(realpath ../..)
+
+include $(CONFDIR)/clean.mk

testsuite/bsc.lib/BuildList/TestBuildList.bs

@@ -0,0 +1,42 @@
+package TestBuildList where
+
+import List
+import BuildList
+
+{-# properties sysTestBuildList = { synthesize } #-}
+
+sysTestBuildList :: Module Empty
+sysTestBuildList =
+  module
+    let
+        v1 :: List Bool
+        v1 =  lst True False True True
+
+        v2 :: List (UInt 8);
+        v2 =  lst 7 32
+
+        v3 :: List Bool
+        v3 =  lst False True True
+
+        v4 :: List (UInt 4)
+        v4 =  lst 3
+
+    done :: Reg Bool <- mkReg False
+
+    rules
+      "r":  when not done
+              ==> action
+                    $display "v1[0] -> %b" (v1!!0)
+                    $display "v1[1] -> %b" (v1!!1)
+                    $display "v1[2] -> %b" (v1!!2)
+                    $display "v1[3] -> %b" (v1!!3)
+                    $display "v2[0] -> %d" (v2!!0)
+                    $display "v2[1] -> %d" (v2!!1)
+                    $display "v3[0] -> %b" (v3!!0)
+                    $display "v3[1] -> %b" (v3!!1)
+                    $display "v3[2] -> %b" (v3!!2)
+                    $display "v4[0] -> %d" (v4!!0)
+                    done := True
+
+      "r2":  when done
+               ==> $finish 0

testsuite/bsc.lib/BuildList/TestBuildListFail.bs

@@ -0,0 +1,27 @@
+package TestBuildListFail where
+
+import List
+import BuildList
+
+-- Test error messages
+
+-- Wrong element type, Literal
+fn1 :: Bool
+fn1 =
+    let v :: List Bool
+        v =  lst 0 1 2
+    in  v == v
+
+-- Wrong element type, concrete
+fn2 :: Bool
+fn2 =
+    let v :: List Integer
+        v =  lst True False True
+    in  v == v
+
+-- Wrong return type
+fn3 :: Bool
+fn3 =
+    let v :: Bit 3
+        v =  lst True False True
+    in  v == v

testsuite/bsc.lib/BuildList/TestBuildListFail.bs.bsc-out.expected

@@ -0,0 +1,24 @@
+checking package dependencies
+compiling TestBuildListFail.bs
+Error: "TestBuildListFail.bs", line 12, column 13: (T0031)
+  The contexts for this expression could not be resolved because there are no
+  instances of the form:
+    Prelude.Literal Prelude.Bool
+  The context was implied by expressions at the following positions:
+    "TestBuildListFail.bs", line 12, column 17
+Error: "TestBuildListFail.bs", line 18, column 8: (T0032)
+  This expression requires the following context which could not be resolved:
+    BuildList.BuildList Prelude.Bool (Prelude.Bool -> Prelude.Bool -> Prelude.List Prelude.Integer)
+  The context was implied by expressions at the following positions:
+    "TestBuildListFail.bs", line 19, column 13
+  An instance for this context exists, but it depends on the following context
+  for which there is no instance:
+    BuildList.BuildList Prelude.Bool (Prelude.List Prelude.Integer)
+Error: "TestBuildListFail.bs", line 25, column 8: (T0032)
+  This expression requires the following context which could not be resolved:
+    BuildList.BuildList Prelude.Bool (Prelude.Bool -> Prelude.Bool -> Prelude.Bit 3)
+  The context was implied by expressions at the following positions:
+    "TestBuildListFail.bs", line 26, column 13
+  An instance for this context exists, but it depends on the following context
+  for which there is no instance:
+    BuildList.BuildList Prelude.Bool (Prelude.Bit 3)

testsuite/bsc.lib/BuildList/sysTestBuildList.out.expected

@@ -0,0 +1,10 @@
+v1[0] -> 1
+v1[1] -> 0
+v1[2] -> 1
+v1[3] -> 1
+v2[0] ->   7
+v2[1] ->  32
+v3[0] -> 0
+v3[1] -> 1
+v3[2] -> 1
+v4[0] ->  3