fix crash when optimizing pipe expression too aggressively

codeOptimizers/src/prog8/optimizer/StatementOptimizer.kt

@@ -18,7 +18,7 @@ class StatementOptimizer(private val program: Program,
 
     override fun before(functionCallExpr: FunctionCallExpression, parent: Node): Iterable<IAstModification> {
         // if the first instruction in the called subroutine is a return statement with a simple value (NOT being a parameter),
-        // remove the jump altogeter and inline the returnvalue directly.
+        // remove the jump altogeter and inline the returnvalue directly. (only if not part of a pipe expression)
 
         fun scopePrefix(variable: IdentifierReference): IdentifierReference {
             val target = variable.targetStatement(program) as INamedStatement
@@ -28,7 +28,7 @@ class StatementOptimizer(private val program: Program,
         val subroutine = functionCallExpr.target.targetSubroutine(program)
         if(subroutine!=null) {
             val first = subroutine.statements.asSequence().filterNot { it is VarDecl || it is Directive }.firstOrNull()
-            if(first is Return && first.value?.isSimple==true) {
+            if(first is Return && first.value?.isSimple==true && parent !is IPipe) {
                 val copy = when(val orig = first.value!!) {
                     is AddressOf -> {
                         val scoped = scopePrefix(orig.identifier)

compiler/res/prog8lib/virtual/math.p8

@@ -3,5 +3,68 @@
 ; Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0
 
 math {
-	; required by the compiler, but the vm implements all math operations as instructions.
+
+    sub sin8u(ubyte angle) -> ubyte {
+        return 42     ; TODO
+    }
+
+    sub cos8u(ubyte angle) -> ubyte {
+        return 42     ; TODO
+    }
+
+    sub sin8(ubyte angle) -> byte {
+        return 42     ; TODO
+    }
+
+    sub cos8(ubyte angle) -> byte {
+        return 42     ; TODO
+    }
+
+    sub sin16(ubyte angle) -> word {
+        return 4242     ; TODO
+    }
+
+    sub cos16(ubyte angle) -> word {
+        return 4242     ; TODO
+    }
+
+    sub sin16u(ubyte angle) -> uword {
+        return 4242     ; TODO
+    }
+
+    sub cos16u(ubyte angle) -> uword {
+        return 4242     ; TODO
+    }
+
+    sub sinr8u(ubyte radians) -> ubyte {
+        return 42     ; TODO
+    }
+
+    sub cosr8u(ubyte radians) -> ubyte {
+        return 42     ; TODO
+    }
+
+    sub sinr8(ubyte radians) -> byte {
+        return 42     ; TODO
+    }
+
+    sub cosr8(ubyte radians) -> byte {
+        return 42     ; TODO
+    }
+
+    sub sinr16(ubyte radians) -> word {
+        return 4242     ; TODO
+    }
+
+    sub cosr16(ubyte radians) -> word {
+        return 4242     ; TODO
+    }
+
+    sub sinr16u(ubyte radians) -> uword {
+        return 4242     ; TODO
+    }
+
+    sub cosr16u(ubyte radians) -> uword {
+        return 4242     ; TODO
+    }
 }

compilerAst/src/prog8/ast/AstToSourceTextConverter.kt

@@ -472,6 +472,7 @@ class AstToSourceTextConverter(val output: (text: String) -> Unit, val program:
 
     private fun printPipe(source: Expression, segments: Iterable<Expression>) {
         source.accept(this)
+        output(" |> ")
         segments.first().accept(this)
         outputln("")
         scopelevel++

examples/test.p8

@@ -1,4 +1,5 @@
 %import textio
+%import math
 %zeropage dontuse
 
 
@@ -7,31 +8,11 @@
 main {
 
     sub start() {
-        const ubyte times=3
+        ubyte source=99
+        ubyte value= source |> math.sin8u() |> math.cos8u()
+        txt.print_ub(value)
+
         ; expected output: aaabbb aaa bbb
-        txt.print("aaa"+"bbb"+"ccc")
-        txt.nl()
-;        txt.print("aaa")
-;        txt.nl()
-;        txt.print("bbb")
-;        txt.nl()
-        ; expected output: xxx   xxxxxx   xxxxxxxxx   xxx
-;        txt.print("xxx"*(times-2))
-;        txt.nl()
-;        txt.print("xxx"*(times-1))
-;        txt.nl()
-        txt.print("xxx"*times)
-        txt.nl()
-;        txt.print("xxx")
-;        txt.nl()
-        sys.exit(42)
-;        floats.print_f(-42.42)
-;        float f1 = 1.2345
-;        float f2 = -9.99
-;        float f3
-;        f3 = floats.sin(f3)
-;        floats.print_f(f3)
-;        txt.nl()
 
 ;    float f1 = 1.555
 ;    floats.print_f(floats.sin(f1))