Allow text literals in more positions

examples/crossplatform/fizzbuzz2.mfk

@@ -9,13 +9,9 @@ struct stage {
     pointer text
 }
 
-// can't put text literals directly in struct constructors yet
-array fizz = "fizz"z
-array buzz = "buzz"z
-
 array(stage) stages = [
-    stage(divisible3.pointer, fizz),
-    stage(divisible5.pointer, buzz)
+    stage(divisible3.pointer, "fizz"z),
+    stage(divisible5.pointer, "buzz"z)
 ]
 
 void main() {

src/main/scala/millfork/compiler/AbstractStatementPreprocessor.scala

@@ -250,14 +250,6 @@ abstract class AbstractStatementPreprocessor(protected val ctx: CompilationConte
     }
   }
 
-  def genName(characters: List[Expression]): String = {
-    "textliteral$" ++ characters.flatMap{
-      case LiteralExpression(n, _) =>
-        f"$n%02x"
-      case _ => ???
-    }
-  }
-
   def optimizeExpr(expr: Expression, currentVarValues: VV): Expression = {
     val pos = expr.position
     // stdlib:
@@ -448,11 +440,8 @@ abstract class AbstractStatementPreprocessor(protected val ctx: CompilationConte
         DerefExpression(optimizeExpr(inner, currentVarValues), 0, env.get[VariableType]("byte")).pos(pos)
       case DerefDebuggingExpression(inner, 2) =>
         DerefExpression(optimizeExpr(inner, currentVarValues), 0, env.get[VariableType]("word")).pos(pos)
-      case TextLiteralExpression(characters) =>
-        val name = genName(characters)
-        if (ctx.env.maybeGet[Thing](name).isEmpty) {
-          ctx.env.root.registerArray(ArrayDeclarationStatement(name, None, None, "byte", None, const = true, Some(LiteralContents(characters)), None).pos(pos), ctx.options)
-        }
+      case e@TextLiteralExpression(characters) =>
+        val name = ctx.env.getTextLiteralArrayName(e)
         VariableExpression(name).pos(pos)
       case VariableExpression(v) if currentVarValues.contains(v) =>
         val constant = currentVarValues(v)

src/main/scala/millfork/env/Environment.scala

@@ -599,7 +599,7 @@ class Environment(val parent: Option[Environment], val prefix: String, val cpuFa
   private def evalImpl(e: Expression, vv: Option[Map[String, Constant]]): Option[Constant] = {
     e match {
       case LiteralExpression(value, size) => Some(NumericConstant(value, size))
-      case _:TextLiteralExpression => ???
+      case tl:TextLiteralExpression => Some(getPointy(getTextLiteralArrayName(tl)).asInstanceOf[ConstantPointy].value)
       case ConstantArrayElementExpression(c) => Some(c)
       case GeneratedConstantExpression(c, t) => Some(c)
       case VariableExpression(name) =>
@@ -1160,6 +1160,19 @@ class Environment(val parent: Option[Environment], val prefix: String, val cpuFa
       get[Type]("function." + p.name + ".to." + f.returnType.name)
   }
 
+  def getTextLiteralArrayName(literal: TextLiteralExpression): String = {
+    val name = "textliteral$" ++ literal.characters.flatMap {
+      case LiteralExpression(n, _) =>
+        f"$n%02x"
+      case _ => ???
+    }
+    if (maybeGet[Thing](name).isEmpty) {
+      println("registering text literal")
+      root.registerArray(ArrayDeclarationStatement(name, None, None, "byte", None, const = true, Some(LiteralContents(literal.characters)), None).pos(literal.position), options)
+    }
+    name
+  }
+
   private def registerAddressConstant(thing: ThingInMemory, position: Option[Position], options: CompilationOptions, targetType: Option[Type]): Unit = {
     val b = get[Type]("byte")
     if (!thing.zeropage && options.flag(CompilationFlag.LUnixRelocatableCode)) {

src/main/scala/millfork/output/AbstractAssembler.scala

@@ -339,6 +339,15 @@ abstract class AbstractAssembler[T <: AbstractCode](private val program: Program
       case _ =>
     }
 
+    // force early allocation of text literals:
+    env.allPreallocatables.filterNot(o => unusedRuntimeObjects(o.name)).foreach{
+      case thing@InitializedArray(_, _, items, _, _, _, _, _) =>
+        items.foreach(env.eval(_))
+      case InitializedMemoryVariable(_, _, _, value, _, _, _) =>
+        env.eval(value)
+      case _ =>
+    }
+
     if (options.flag(CompilationFlag.LUnixRelocatableCode)) {
       env.allThings.things.foreach {
         case (_, m@UninitializedMemoryVariable(name, typ, _, _, _, _)) if name.endsWith(".addr") || env.maybeGet[Thing](name + ".array").isDefined =>