add support for pointer sizes >2 to configurable targets

codeCore/src/prog8/code/target/ConfigFileTarget.kt

@@ -38,8 +38,13 @@ class ConfigFileTarget(
     val virtualregistersStart: UInt,
     val zpFullsafe: List<UIntRange>,
     val zpKernalsafe: List<UIntRange>,
-    val zpBasicsafe: List<UIntRange>
-): ICompilationTarget, IStringEncoding by Encoder(true), IMemSizer by NormalMemSizer(8) {
+    val zpBasicsafe: List<UIntRange>,
+    val pointerSize: Int = 2
+): ICompilationTarget, IStringEncoding by Encoder(true), IMemSizer by NormalMemSizer(8, pointerSize) {
+
+    init {
+        require(pointerSize == 2 || pointerSize == 4) { "unsupported pointer size: $pointerSize" }
+    }
 
     companion object {
 
@@ -66,6 +71,12 @@ class ConfigFileTarget(
             return value.toUInt()
         }
 
+        private fun parsePointerSize(props: Properties): Int {
+            val pointerSize = parseInt(props.getProperty("pointer_size", "2")).toInt()
+            require(pointerSize == 2 || pointerSize == 4) { "unsupported pointer size: $pointerSize" }
+            return pointerSize
+        }
+
         private fun parseAddressRanges(key: String, props: Properties): List<UIntRange> {
             val rangesStr = props.getString(key)
             if(rangesStr.isBlank())
@@ -111,6 +122,7 @@ class ConfigFileTarget(
                     (customLauncherStr+"\n").lines().map { it.trimEnd() }
                 else emptyList()
             val assemblerOptionsStr = props.getProperty("assembler_options", "").trim()
+            val pointerSize = parsePointerSize(props)
             val outputTypeString = props.getProperty("output_type", "PRG")
             val defaultOutputType = OutputType.valueOf(outputTypeString.uppercase())
             val launcherString = props.getProperty("launcher", "BASIC")
@@ -146,6 +158,7 @@ class ConfigFileTarget(
                 zpFullsafe,
                 zpKernalsafe,
                 zpBasicsafe,
+                pointerSize,
             )
         }
     }
@@ -154,8 +167,8 @@ class ConfigFileTarget(
     override val FLOAT_MAX_POSITIVE = 9.999999999e97
     override val FLOAT_MAX_NEGATIVE = -9.999999999e97
     override val FLOAT_MEM_SIZE = 8u
-    override val POINTER_MEM_SIZE = 2u      // TODO should support other pointer size as well 
-    override val ARRAY_SIZE_LIMIT = 256u    // TODO should support other size as well
+    override val POINTER_MEM_SIZE = pointerSize.toUInt()
+    override val ARRAY_SIZE_LIMIT = 256u
     override lateinit var zeropage: Zeropage
 
     override fun getFloatAsmBytes(num: Number) = TODO("floats")

codeCore/test/prog8tests/codecore/TestConfigFileTarget.kt

@@ -0,0 +1,66 @@
+package prog8tests.codecore
+
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.matchers.shouldBe
+import prog8.code.core.BaseDataType
+import prog8.code.target.ConfigFileTarget
+import java.nio.file.Files
+import kotlin.io.path.writeText
+
+class TestConfigFileTarget: FunSpec({
+    fun loadTarget(extraProperties: String = ""): ConfigFileTarget {
+        val directory = Files.createTempDirectory("prog8-config-target")
+        val library = Files.createDirectories(directory.resolve("library"))
+        val config = directory.resolve("target.properties")
+        config.writeText(
+            """
+            cpu = 65C02
+            encoding = iso
+            load_address = 2048
+            memtop = 65535
+            bss_highram_start = 0
+            bss_highram_end = 0
+            bss_goldenram_start = 0
+            bss_goldenram_end = 0
+            zp_scratch_b1 = 240
+            zp_scratch_reg = 241
+            zp_scratch_w1 = 242
+            zp_scratch_w2 = 244
+            zp_scratch_ptr = 246
+            virtual_registers = 2
+            zp_fullsafe = 34-239
+            zp_kernalsafe = 34-239
+            zp_basicsafe = 34-239
+            io_regions =
+            """.trimIndent() + "\nlibrary = $library\n$extraProperties"
+        )
+        return try {
+            ConfigFileTarget.fromConfigFile(config)
+        } finally {
+            directory.toFile().deleteRecursively()
+        }
+    }
+
+    test("legacy config defaults to 2-byte pointers and 256 element arrays") {
+        val target = loadTarget()
+
+        target.POINTER_MEM_SIZE shouldBe 2u
+        target.memorySize(BaseDataType.POINTER) shouldBe 2
+        target.ARRAY_SIZE_LIMIT shouldBe 256u
+    }
+
+    test("config supports 4-byte pointers") {
+        val target = loadTarget("pointer_size = 4")
+
+        target.POINTER_MEM_SIZE shouldBe 4u
+        target.memorySize(BaseDataType.POINTER) shouldBe 4
+        target.ARRAY_SIZE_LIMIT shouldBe 256u
+    }
+
+    test("config rejects unsupported pointer sizes") {
+        shouldThrow<IllegalArgumentException> {
+            loadTarget("pointer_size = 3")
+        }
+    }
+})