fixed callgraph issue that allocated ALL variables in a (library) module even though some clearly weren't used at all. Variables declared in block level scope in a library are still all allocated / defined due to the nature of a library module with lists of definitions

compiler/res/prog8lib/cx16/gfx2.p8

@@ -204,8 +204,6 @@ gfx2 {
         ;    You must also have called text_charset() first to select and prepare the character set to use.
         ;    NOTE: in monochrome (1bpp) screen modes, x position is currently constrained to mulitples of 8 !
         uword chardataptr
-        ubyte cy222         ; TODO why not removed by compiler???
-        ubyte cb222         ; TODO why not removed by compiler???
         when active_mode {
             0, 128 -> {
                 ; 1-bitplane modes

compiler/res/prog8lib/diskio.p8

@@ -75,7 +75,9 @@ io_error:
         ; -- fill the array 'name_ptrs' with (pointers to) the names of the files requested.
         ubyte[256] names_buffer
         ubyte[256] names_buffer1        ; to store a bit more names
+        ; TODO  names_buffer = memory("filenames", 512)
         uword buf_ptr = &names_buffer
+        names_buffer1[0] = 0  ; TODO force array to exist
         ubyte files_found = 0
         if lf_start_list(drivenumber, pattern, suffixmatch) {
             while lf_next_entry() {

compiler/src/prog8/optimizer/CallGraph.kt

@@ -117,12 +117,9 @@ class CallGraph(private val program: Program) : IAstVisitor {
     }
 
     override fun visit(decl: VarDecl) {
-        if (decl.autogeneratedDontRemove || decl.definingModule().isLibraryModule) {
-            // make sure autogenerated vardecls are in the used symbols and are never removed as 'unused'
+        if (decl.autogeneratedDontRemove || decl.datatype==DataType.STRUCT)
             addNodeAndParentScopes(decl)
-        }
-
-        if (decl.datatype == DataType.STRUCT)
+        else if(decl.parent is Block && decl.definingModule().isLibraryModule)
             addNodeAndParentScopes(decl)
 
         super.visit(decl)

docs/source/todo.rst

@@ -2,7 +2,6 @@
 TODO
 ====
 
-- why are unused vars not removed in gfx2 module
 - hoist all variable declarations up to the subroutine scope *before* even the constant folding takes place (to avoid undefined symbol errors when referring to a variable from another nested scope in the subroutine)
 - make it possible to use cpu opcodes such as 'nop' as variable names by prefixing all asm vars with something such as '_'
 - option to load the built-in library files from a directory instead of the embedded ones (for easier library development/debugging)

examples/cx16/imageviewer/iff_module.p8

@@ -4,6 +4,7 @@
 %import diskio
 
 iff_module {
+    ; TODO uword cmap = memory("palette", 768)
     ubyte[256] cmap
     ubyte[256] cmap1
     ubyte[256] cmap2

examples/test.p8

@@ -1,17 +1,19 @@
-%import test_stack
-%import textio
+;%import test_stack
+;%import textio
+%import gfx2
 %zeropage basicsafe
 %option no_sysinit
 
 main {
 
     sub start () {
-        txt.lowercase()
-        txt.print_ub(txt.width())
-        txt.chrout('\n')
-        txt.print_ub(txt.height())
-        txt.chrout('\n')
-        test_stack.test()
+;        txt.lowercase()
+;        txt.print_ub(txt.width())
+;        txt.chrout('\n')
+;        txt.print_ub(txt.height())
+;        txt.chrout('\n')
+        gfx2.text(0,0,2, "sdafsdf")
+;        test_stack.test()
     }
 
 }