remove empty when choices, fixes ir compilation error on those

codeGenIntermediate/src/prog8/codegen/intermediate/IRCodeGen.kt

@@ -99,16 +99,18 @@ class IRCodeGen(
         // make sure that first chunks in Blocks and Subroutines share the name of the block/sub as label.
 
         irProg.blocks.forEach { block ->
-            block.children.firstOrNull { it is IRInlineAsmChunk }?.let { first->
-                first as IRInlineAsmChunk
-                if(first.label==null) {
-                    val replacement = IRInlineAsmChunk(block.label, first.assembly, first.isIR, first.next)
+            if(block.isNotEmpty()) {
+                val firstAsm = block.children[0] as? IRInlineAsmChunk
+                if(firstAsm!=null) {
+                    if(firstAsm.label==null) {
+                        val replacement = IRInlineAsmChunk(block.label, firstAsm.assembly, firstAsm.isIR, firstAsm.next)
                         block.children.removeAt(0)
                         block.children.add(0, replacement)
-                } else if(first.label != block.label) {
+                    } else if(firstAsm.label != block.label) {
                         throw AssemblyError("first chunk in block has label that differs from block name")
                     }
                 }
+            }
 
             block.children.filterIsInstance<IRSubroutine>().forEach { sub ->
                 if(sub.chunks.isNotEmpty()) {

compiler/src/prog8/compiler/astprocessing/VariousCleanups.kt

@@ -262,5 +262,15 @@ internal class VariousCleanups(val program: Program, val errors: IErrorReporter,
         }
         return noModifications
     }
+
+    override fun after(whenStmt: When, parent: Node): Iterable<IAstModification> {
+        val removals = mutableListOf<Int>()
+        whenStmt.choices.withIndex().forEach { (index, choice) ->
+            if(choice.statements.isEmpty())
+                removals.add(index)
+        }
+        removals.reversed().forEach { whenStmt.choices.removeAt(it) }
+        return noModifications
+    }
 }
 

compiler/test/vm/TestCompilerVirtual.kt

@@ -451,4 +451,26 @@ main {
         }
     }
 
+    test("asm chunk labels in IR code") {
+        val src="""
+main {
+    sub start() {
+        instructions.match()
+    }
+}
+
+instructions {
+    asmsub  match() {
+        %asm {{
+            rts
+        }}
+    }
+
+    %asm {{
+        nop
+    }}
+}"""
+        compileText(VMTarget(), false, src, writeAssembly = true) shouldNotBe null
+    }
+
 })

docs/source/todo.rst

@@ -1,8 +1,6 @@
 TODO
 ====
 
-- Fix expericodegen errors (assem, rockrunners)
-
 ...
 
 

examples/test.p8

@@ -1,41 +1,18 @@
 %import textio
 
 main {
-
     sub start() {
-;        uword[] routines = [ 0, &command, $4444 ]
-;        cx16.r0 = routines[1]
-
-        &ubyte[5] cells = $4000
-        cells = [1,2,3,4,5]
-        str name = "irmen"
-
-        ubyte[5] othercells = [11,22,33,44,55]
-
-        txt.print_ub(1 in cells)
-        txt.print_ub(44 in othercells)
-        txt.print_ub('a' in name)
-        txt.print_ub('e' in name)
-        txt.nl()
-        txt.print_ub(all(othercells))
-        txt.print_ub(any(othercells))
-        othercells[3] = 0
-        txt.print_ub(all(othercells))
-        txt.print_ub(any(othercells))
-        reverse(othercells)
-        sort(othercells)
-        txt.nl()
-
-        txt.print_ub(all(cells))
-        txt.print_ub(any(cells))
-        cells[3] = 0
-        txt.print_ub(all(cells))
-        txt.print_ub(any(cells))
-        reverse(cells)
-        sort(cells)
+        cx16.r0 = 2
+        when cx16.r0 {
+            1-> {
+                ;nothing
+            }
+            2 -> {
+                txt.print("two")
+            }
+            0-> {
+                ;nothing
+            }
         }
-
-    sub command() {
-        cx16.r0++
     }
 }