vm assembler now understands simple indexed addresses (symbol+number)

docs/source/todo.rst

@@ -3,9 +3,9 @@ TODO
 
 For next release
 ^^^^^^^^^^^^^^^^
-- IR/VM: add address calculation for simple addition:  conv.string_out+42
 - IR/VM: add proper memory mapped variables support - replace the symbol by the memory address in the IR code.
 - IR/VM: check that the above works ok now with the cx16 virtual registers.
+- IR/VM: actually support the physical cpu registers and status flags in the STORECPU and LOADCPU opcodes.
 - IR/VM: add proper memory slabs support
 - IR/VM: improve unit tests
 

virtualmachine/src/prog8/vm/Assembler.kt

@@ -247,7 +247,15 @@ class Assembler {
         for((line, label) in placeholders) {
             val replacement = labels[label]
             if(replacement==null) {
-                println("TODO: find address of symbol $label")      // TODO
+                // it could be an address + index:   symbol+42
+                if('+' in label) {
+                    val (symbol, indexStr) = label.split('+')
+                    val index = indexStr.toInt()
+                    val address = labels.getValue(symbol) + index
+                    program[line] = program[line].copy(value = address)
+                } else {
+                    throw IllegalArgumentException("placeholder not found in labels: $label")
+                }
             } else {
                 program[line] = program[line].copy(value = replacement)
             }