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replacing complex array indexer expressions moved to BeforeAsmGeneration + use cx16 virtualregister instead of adding temp variables for this
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@ -8,6 +8,7 @@ import prog8.ast.expressions.*
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import prog8.ast.statements.*
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import prog8.ast.walk.AstWalker
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import prog8.ast.walk.IAstModification
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import prog8.ast.walk.IAstVisitor
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import prog8.compiler.target.ICompilationTarget
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@ -230,6 +231,14 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, val errors: I
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}
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override fun after(arrayIndexedExpression: ArrayIndexedExpression, parent: Node): Iterable<IAstModification> {
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val containingStatement = getContainingStatement(arrayIndexedExpression)
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if(getComplexArrayIndexedExpressions(containingStatement).size > 1) {
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errors.err("it's not possible to use more than one complex array indexing expression in a single statement; break it up via a temporary variable for instance", containingStatement.position)
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return noModifications
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}
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val index = arrayIndexedExpression.indexer.indexExpr
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if(index !is NumericLiteralValue && index !is IdentifierReference) {
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// replace complex indexing expression with a temp variable to hold the computed index first
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@ -239,33 +248,51 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, val errors: I
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return noModifications
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}
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private fun getComplexArrayIndexedExpressions(stmt: Statement): List<ArrayIndexedExpression> {
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class Searcher : IAstVisitor {
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val complexArrayIndexedExpressions = mutableListOf<ArrayIndexedExpression>()
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override fun visit(arrayIndexedExpression: ArrayIndexedExpression) {
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val ix = arrayIndexedExpression.indexer.indexExpr
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if(ix !is NumericLiteralValue && ix !is IdentifierReference)
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complexArrayIndexedExpressions.add(arrayIndexedExpression)
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}
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override fun visit(branchStatement: BranchStatement) {}
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override fun visit(forLoop: ForLoop) {}
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override fun visit(ifStatement: IfStatement) {
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ifStatement.condition.accept(this)
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}
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override fun visit(untilLoop: UntilLoop) {
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untilLoop.condition.accept(this)
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}
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}
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val searcher = Searcher()
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stmt.accept(searcher)
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return searcher.complexArrayIndexedExpressions
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}
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private fun getContainingStatement(expression: Expression): Statement {
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var node: Node = expression
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while(node !is Statement)
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node = node.parent
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return node
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}
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private fun getAutoIndexerVarFor(expr: ArrayIndexedExpression): MutableList<IAstModification> {
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val modifications = mutableListOf<IAstModification>()
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val subroutine = expr.definingSubroutine()!!
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val statement = expr.containingStatement()
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val indexerVarPrefix = "prog8_autovar_index_"
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val repo = subroutine.asmGenInfo.usedAutoArrayIndexerForStatements
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// TODO [codegen] make this a bit smarter so it can reuse indexer variables. BUT BEWARE of scoping+initialization problems then
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// for instance when dealing with multiple complex array indices in a single statement...
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// ... use cx16's virtual registers for this instead of adding new variables?
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// add another loop index var to be used for this expression
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val indexerVarName = "$indexerVarPrefix${expr.indexer.hashCode()}"
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val indexerVar = AsmGenInfo.ArrayIndexerInfo(indexerVarName, expr.indexer)
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repo.add(indexerVar)
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// create the indexer var at block level scope
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val vardecl = VarDecl(VarDeclType.VAR, DataType.UBYTE, ZeropageWish.PREFER_ZEROPAGE,
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null, indexerVarName, null, null, isArray = false, autogeneratedDontRemove = true, position = expr.position)
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modifications.add(IAstModification.InsertFirst(vardecl, subroutine))
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// replace the indexer with just the variable
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// replace the indexer with just the variable (simply use a cx16 virtual register r9, that we HOPE is not used for other things in the expression...)
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// assign the indexing expression to the helper variable, but only if that hasn't been done already
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val target = AssignTarget(IdentifierReference(listOf(indexerVar.name), expr.indexer.position), null, null, expr.indexer.position)
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val target = AssignTarget(IdentifierReference(listOf("cx16", "r9"), expr.indexer.position), null, null, expr.indexer.position)
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val assign = Assignment(target, expr.indexer.indexExpr, expr.indexer.position)
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modifications.add(IAstModification.InsertBefore(statement, assign, statement.definingScope()))
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modifications.add(IAstModification.ReplaceNode(expr.indexer.indexExpr, target.identifier!!.copy(), expr.indexer)) // TODO is this ok now?
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modifications.add(IAstModification.ReplaceNode(expr.indexer.indexExpr, target.identifier!!.copy(), expr.indexer))
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return modifications
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}
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@ -1341,8 +1341,16 @@ internal class AssignmentAsmGen(private val program: Program, private val asmgen
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}
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internal fun assignRegisterByte(target: AsmAssignTarget, register: CpuRegister) {
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if(target.register !in Cx16VirtualRegisters)
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// we make an exception in the type check for assigning something to a cx16 virtual register
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if(target.register !in Cx16VirtualRegisters) {
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if(target.kind==TargetStorageKind.VARIABLE) {
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val parts = target.asmVarname.split('.')
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if (parts.size != 2 || parts[0] != "cx16")
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require(target.datatype in ByteDatatypes)
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} else {
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require(target.datatype in ByteDatatypes)
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}
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}
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when(target.kind) {
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TargetStorageKind.VARIABLE -> {
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@ -606,14 +606,11 @@ class AsmGenInfo {
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// Conceptually it should be part of any INameScope.
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// But because the resulting code only creates "real" scopes on a subroutine level,
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// it's more consistent to only define these attributes on a Subroutine node.
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var usedAutoArrayIndexerForStatements = mutableListOf<ArrayIndexerInfo>()
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var usedRegsaveA = false
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var usedRegsaveX = false
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var usedRegsaveY = false
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var usedFloatEvalResultVar1 = false
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var usedFloatEvalResultVar2 = false
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class ArrayIndexerInfo(val name: String, val replaces: ArrayIndex)
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}
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// the subroutine class covers both the normal user-defined subroutines,
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@ -7,6 +7,16 @@ main {
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sub start() {
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txt.print("hello")
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ubyte[] array = [1,2,3,4]
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ubyte ix
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ubyte a = array[1] + array[ix]
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a = array[ix] + array[ix]
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a = array[ix+1] + array[ix]
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uword multiple=0
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a = array[lsb(multiple)] + array[ix]
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; str filename = "titlescreen.bin"
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; ubyte success = cx16.vload(filename, 8, 0, $0000)
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; if success {
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