better error when trying to use a const pointer (which is not supported yet)

codeGenCpu6502/src/prog8/codegen/cpu6502/ProgramAndVarsGen.kt

@@ -938,7 +938,7 @@ internal class ProgramAndVarsGen(
             asmgen.out("  ${it.name} = ${it.address.toHex()}")
         }
         consts.sortedBy { it.name }.forEach {
-            if(it.dt==BaseDataType.FLOAT)
+            if(it.dt.isFloat)
                 asmgen.out("  ${it.name} = ${it.value}")
             else
                 asmgen.out("  ${it.name} = ${it.value.toHex()}")

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

@@ -122,7 +122,6 @@ private fun convert(variable: StMemVar): IRStMemVar {
 
 
 private fun convert(constant: StConstant): IRStConstant {
-    val dt = DataType.forDt(constant.dt)
     val scopedName = if('.' in constant.name) {
         constant.name
     } else {
@@ -132,7 +131,7 @@ private fun convert(constant: StConstant): IRStConstant {
             constant.name
         }
     }
-    return IRStConstant(scopedName, dt, constant.value)
+    return IRStConstant(scopedName, constant.dt, constant.value)
 }
 
 

compiler/src/prog8/compiler/astprocessing/AstChecker.kt

@@ -874,9 +874,9 @@ internal class AstChecker(private val program: Program,
             err("recursive var declaration")
 
         // CONST can only occur on simple types (byte, word, float)
-        if(decl.type== VarDeclType.CONST) {
+        if(decl.type==VarDeclType.CONST) {
             if (!decl.datatype.isNumericOrBool)
-                err("const can only be used on numeric types or booleans")
+                err("const can only be used on numbers and booleans")
         }
 
         // FLOATS enabled?

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

@@ -27,6 +27,7 @@ internal class VariousCleanups(val program: Program, val errors: IErrorReporter,
             if(valueType.isUnknown)
                 return noModifications
             val valueDt = valueType.getOrUndef()
+            if(!(valueDt.isWord && decl.datatype.isPointer)) {
                 when(decl.type) {
                     VarDeclType.VAR -> {
                         if(decl.isArray) {
@@ -65,7 +66,7 @@ internal class VariousCleanups(val program: Program, val errors: IErrorReporter,
                     VarDeclType.MEMORY -> if(!valueType.isWords && !valueType.isBytes)
                         throw FatalAstException("value type for a memory var should be word or byte (address)")
                 }
-
+            }
         }
 
         // check splitting of word arrays

compiler/test/TestPointers.kt

@@ -690,20 +690,28 @@ main {
         this.text = next as uword       ; TODO fix type error; the cast should succeed
     }
 }"""
-        compileText(VMTarget(), false, src, outputDir, writeAssembly = false) shouldNotBe null
+        compileText(VMTarget(), false, src, outputDir) shouldNotBe null
+        compileText(C64Target(), false, src, outputDir) shouldNotBe null
     }
 
-    xtest("const pointer") {
+    test("const pointer gives proper error") {
         val src="""
 main {
     sub start() {
         ^^uword @shared ptr = 7000
-        const ^^uword cptr = 8000            ; TODO fix type error; loses pointer
+        const ^^uword cptr = 8000
-        ptr^^ = 12345
+
-        cptr^^ = 12345
+        ;ptr^^ = 12345
+        ;cptr^^ = 12345
+        
+        cx16.r0 = cptr
+        cx16.r1 = ptr
     }
 }"""
-        compileText(VMTarget(), false, src, outputDir, writeAssembly = false) shouldNotBe null
+        val errors = ErrorReporterForTests()
+        compileText(VMTarget(), false, src, outputDir, errors=errors, writeAssembly = true) shouldBe null
+        errors.errors.size shouldBe 1
+        errors.errors[0] shouldContain("const can only be used on numbers and booleans")
     }
 
     test("unknown field") {

compiler/test/TestSymbolTable.kt

@@ -208,8 +208,8 @@ private fun makeSt(): SymbolTable {
     val sub12 = StNode("sub2", StNodeType.SUBROUTINE, astSub2)
     block1.add(sub11)
     block1.add(sub12)
-    block1.add(StConstant("c1", BaseDataType.UWORD, 12345.0, astConstant1))
+    block1.add(StConstant("c1", DataType.UWORD, 12345.0, astConstant1))
-    block1.add(StConstant("blockc", BaseDataType.UWORD, 999.0, astConstant2))
+    block1.add(StConstant("blockc", DataType.UWORD, 999.0, astConstant2))
     sub11.add(StStaticVariable("v1", DataType.BYTE, null, null, null, ZeropageWish.DONTCARE, 0u, false, astSub1v1))
     sub11.add(StStaticVariable("v2", DataType.BYTE, null, null, null, ZeropageWish.DONTCARE, 0u, false, astSub1v2))
     sub11.add(StMemVar("v3", DataType.FLOAT, 12345u, null, astSub1v3))

docs/source/todo.rst

@@ -13,6 +13,7 @@ Future Things and Ideas
 - struct/ptr: optimize the float copying in assignIndexedPointer() (also word and long?)
 - struct/ptr: optimize augmented assignments to indexed pointer targets like sprptr[2]^^.y++  (these are now not performend in-place but as a regular assignment)
 - struct/ptr: implement even more struct instance assignments (via memcopy) in CodeDesugarer (see the TODO) (add to documentation as well, paragraph 'Structs')
+- struct/ptr: support const pointers (simple and struct types)
 - struct/ptr: support @nosplit pointer arrays?
 - struct/ptr: support pointer to pointer?
 - struct/ptr: support for typed function pointers?  (&routine could be typed by default as well then)

examples/test.p8

@@ -1,135 +1,26 @@
-;%zeropage basicsafe
-;%import textio
-;
-;main {
-;    sub start() {
-;        ^^uword @shared ptr = 7000
-;        const ^^uword cptr = 8000            ; TODO fix type error; loses pointer
-;        ptr^^ = 12345
-;        cptr^^ = 12345
-;        txt.print_uw(peekw(7000))
-;        txt.spc()
-;        txt.print_uw(peekw(8000))
-;    }
-;}
-
-
-; TYPE CAST CRASH:
-;%zeropage basicsafe
-;%import strings
-;%import textio
-;
-;main {
-;    struct Line {
-;        ^^Line prev
-;        ^^Line next
-;        ^^ubyte text
-;    }
-;    uword buffer = memory("buffer", 100*sizeof(Line), 1)
-;    ^^Line next = buffer
-;
-;    sub start() {
-;        ^^Line line = next
-;        next += 1
-;        line.text = next as ^^ubyte        ; TODO fix crash here
-;        next = (next as uword) + 81
-;        txt.print_uwhex(buffer, true) txt.nl()
-;        txt.print_uwhex(next, true) txt.nl()
-;        txt.print_uwhex(line, true) txt.nl()
-;        txt.print_uwhex(line.text, true) txt.nl()
-;    }
-;}
-
-
-%import floats
-%import textio
-%zeropage basicsafe
-
 main {
+    struct Node1 {
+        ubyte type
+        word ww
+    }
+    struct Node2 {
+        ubyte type
+        ^^ubyte text
+    }
+
     sub start() {
-        bytetest()
+        ^^Node1 @shared next
-        wordtest()
+        ^^Node2 @shared this
-        longtest()
+        ^^ubyte ubptr
-        floattest()         ; TODO fix invalid 6502 code gen /crash
-    }
 
-    sub bytetest() {
+        ubptr = next as ^^ubyte
-        ubyte[] foo = [11, 22, 33]
+        ubptr = 12345
-        ubyte i
+        ubptr = cx16.r0
-        txt.print("before:")
+        ubptr = next as uword       ; TODO fix type error; the cast should succeed
-        for i in 0 to 2 {
-            txt.chrout(' ')
-            txt.print_ub(foo[i])
-        }
-        txt.nl()
-        foo[2] = foo[1]
-        foo[1] = foo[0]
-        foo[0] = 0
-        txt.print(" after:")
-        for i in 0 to 2 {
-            txt.chrout(' ')
-            txt.print_ub(foo[i])
-        }
-        txt.nl()
-    }
 
-    sub wordtest() {
+        this.text = next as ^^ubyte
-        uword[] foo = [1111, 2222, 3333]
+        this.text = 12345
-        ubyte i
+        this.text = cx16.r0
-        txt.print("before:")
+        this.text = next as uword       ; TODO fix type error; the cast should succeed
-        for i in 0 to 2 {
-            txt.chrout(' ')
-            txt.print_uw(foo[i])
-        }
-        txt.nl()
-        foo[2] = foo[1]
-        foo[1] = foo[0]
-        foo[0] = 0
-        txt.print(" after:")
-        for i in 0 to 2 {
-            txt.chrout(' ')
-            txt.print_uw(foo[i])
-        }
-        txt.nl()
-    }
-
-    sub longtest() {
-        long[] foo = [111111, 222222, 333333]
-        ubyte i
-        txt.print("before:")
-        for i in 0 to 2 {
-            txt.chrout(' ')
-            txt.print_l(foo[i])
-        }
-        txt.nl()
-        foo[2] = foo[1]
-        foo[1] = foo[0]
-        foo[0] = 0
-        txt.print(" after:")
-        for i in 0 to 2 {
-            txt.chrout(' ')
-            txt.print_l(foo[i])
-        }
-        txt.nl()
-    }
-
-    sub floattest() {
-        float[] foo = [1.1, 2.2, 3.3]
-        ubyte i
-        txt.print("before:")
-        for i in 0 to 2 {
-            txt.chrout(' ')
-            txt.print_f(foo[i])
-        }
-        txt.nl()
-        foo[2] = foo[1]
-        foo[1] = foo[0]
-        foo[0] = 0
-        txt.print(" after:")
-        for i in 0 to 2 {
-            txt.chrout(' ')
-            txt.print_f(foo[i])
-        }
-        txt.nl()
     }
 }

intermediate/src/prog8/intermediate/IRFileWriter.kt

@@ -270,6 +270,7 @@ class IRFileWriter(private val irProgram: IRProgram, outfileOverride: Path?) {
             val value: String = when {
                 dt.isBool -> constant.value.toInt().toString()
                 dt.isFloat -> constant.value.toString()
+                dt.isPointer -> TODO("constant pointer $constant")
                 dt.isInteger -> constant.value.toInt().toHex()
                 else -> throw InternalCompilerException("weird dt")
             }

simpleAst/src/prog8/code/SymbolTable.kt

@@ -267,7 +267,7 @@ class StStaticVariable(name: String,
 }
 
 
-class StConstant(name: String, val dt: BaseDataType, val value: Double, astNode: PtNode?) :
+class StConstant(name: String, val dt: DataType, val value: Double, astNode: PtNode?) :
     StNode(name, StNodeType.CONSTANT, astNode)
 
 

simpleAst/src/prog8/code/SymbolTableMaker.kt

@@ -48,7 +48,7 @@ class SymbolTableMaker(private val program: PtProgram, private val options: Comp
             }
             is PtConstant -> {
                 require(node.type.isNumericOrBool)
-                StConstant(node.name, node.type.base, node.value, node)
+                StConstant(node.name, node.type, node.value, node)
             }
             is PtLabel -> {
                 StNode(node.name, StNodeType.LABEL, node)