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248 lines
12 KiB
Kotlin
248 lines
12 KiB
Kotlin
package prog8.codegen.cpu6502
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import prog8.code.ast.*
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import prog8.code.core.*
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import prog8.codegen.cpu6502.assignment.AsmAssignSource
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import prog8.codegen.cpu6502.assignment.AsmAssignTarget
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import prog8.codegen.cpu6502.assignment.AsmAssignment
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import prog8.codegen.cpu6502.assignment.TargetStorageKind
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internal class FunctionCallAsmGen(private val program: PtProgram, private val asmgen: AsmGen) {
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internal fun translateFunctionCallStatement(stmt: PtFunctionCall) {
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saveXbeforeCall(stmt)
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translateFunctionCall(stmt, false)
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restoreXafterCall(stmt)
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// just ignore any result values from the function call.
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}
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internal fun saveXbeforeCall(stmt: PtFunctionCall) {
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val sub = stmt.targetSubroutine(program) ?: throw AssemblyError("undefined subroutine ${stmt.name}")
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if(sub.shouldSaveX()) {
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if(sub is PtAsmSub) {
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val regSaveOnStack = sub.address == null // rom-routines don't require registers to be saved on stack, normal subroutines do because they can contain nested calls
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if (regSaveOnStack)
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asmgen.saveRegisterStack(CpuRegister.X, sub.shouldKeepA().saveOnEntry)
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else
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asmgen.saveRegisterLocal(CpuRegister.X, stmt.definingISub()!!)
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} else
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asmgen.saveRegisterLocal(CpuRegister.X, stmt.definingISub()!!)
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}
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}
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internal fun restoreXafterCall(stmt: PtFunctionCall) {
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val sub = stmt.targetSubroutine(program) ?: throw AssemblyError("undefined subroutine ${stmt.name}")
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if(sub.shouldSaveX()) {
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if(sub is PtAsmSub) {
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val regSaveOnStack = sub.address == null // rom-routines don't require registers to be saved on stack, normal subroutines do because they can contain nested calls
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if (regSaveOnStack)
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asmgen.restoreRegisterStack(CpuRegister.X, sub.shouldKeepA().saveOnReturn)
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else
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asmgen.restoreRegisterLocal(CpuRegister.X)
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} else
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asmgen.restoreRegisterLocal(CpuRegister.X)
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}
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}
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internal fun optimizeIntArgsViaRegisters(sub: PtSub) =
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(sub.parameters.size==1 && sub.parameters[0].type in IntegerDatatypes)
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|| (sub.parameters.size==2 && sub.parameters[0].type in ByteDatatypes && sub.parameters[1].type in ByteDatatypes)
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internal fun translateFunctionCall(call: PtFunctionCall, isExpression: Boolean) { // TODO remove isExpression unused parameter
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// Output only the code to set up the parameters and perform the actual call
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// NOTE: does NOT output the code to deal with the result values!
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// NOTE: does NOT output code to save/restore the X register for this call! Every caller should deal with this in their own way!!
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// (you can use subroutine.shouldSaveX() and saveX()/restoreX() routines as a help for this)
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val sub: IPtSubroutine = call.targetSubroutine(program) ?: throw AssemblyError("undefined subroutine ${call.name}")
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val subAsmName = asmgen.asmSymbolName(call.name)
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if(sub is PtAsmSub) {
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argumentsViaRegisters(sub, call)
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if (sub.inline && asmgen.options.optimize) {
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// inline the subroutine.
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// we do this by copying the subroutine's statements at the call site.
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// NOTE: *if* there is a return statement, it will be the only one, and the very last statement of the subroutine
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// (this condition has been enforced by an ast check earlier)
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asmgen.out(" \t; inlined routine follows: ${sub.name}")
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sub.children.forEach { asmgen.translate(it as PtInlineAssembly) }
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asmgen.out(" \t; inlined routine end: ${sub.name}")
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} else {
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asmgen.out(" jsr $subAsmName")
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}
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}
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else if(sub is PtSub) {
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if(sub.inline)
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throw AssemblyError("can only reliably inline asmsub routines at this time")
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if(optimizeIntArgsViaRegisters(sub)) {
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if(sub.parameters.size==1) {
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val register = if (sub.parameters[0].type in ByteDatatypes) RegisterOrPair.A else RegisterOrPair.AY
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argumentViaRegister(sub, IndexedValue(0, sub.parameters[0]), call.args[0], register)
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} else {
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// 2 byte params, second in Y, first in A
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argumentViaRegister(sub, IndexedValue(0, sub.parameters[0]), call.args[0], RegisterOrPair.A)
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if(asmgen.needAsaveForExpr(call.args[1]))
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asmgen.out(" pha")
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argumentViaRegister(sub, IndexedValue(1, sub.parameters[1]), call.args[1], RegisterOrPair.Y)
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if(asmgen.needAsaveForExpr(call.args[1]))
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asmgen.out(" pla")
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}
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} else {
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// arguments via variables
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for(arg in sub.parameters.withIndex().zip(call.args))
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argumentViaVariable(sub, arg.first.value, arg.second)
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}
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asmgen.out(" jsr $subAsmName")
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}
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else throw AssemblyError("invalid sub type")
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// remember: dealing with the X register and/or dealing with return values is the responsibility of the caller
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}
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private fun argumentsViaRegisters(sub: PtAsmSub, call: PtFunctionCall) {
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if(sub.parameters.size==1) {
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argumentViaRegister(sub, IndexedValue(0, sub.parameters.single().first), call.args[0])
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} else {
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if(asmsub6502ArgsHaveRegisterClobberRisk(call.args, sub.parameters)) {
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registerArgsViaCpuStackEvaluation(call, sub)
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} else {
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asmsub6502ArgsEvalOrder(sub).forEach {
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val param = sub.parameters[it]
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val arg = call.args[it]
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argumentViaRegister(sub, IndexedValue(it, param.first), arg)
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}
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}
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}
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}
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private fun registerArgsViaCpuStackEvaluation(call: PtFunctionCall, callee: PtAsmSub) {
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// this is called when one or more of the arguments are 'complex' and
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// cannot be assigned to a register easily or risk clobbering other registers.
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if(callee.parameters.isEmpty())
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return
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// use the cpu hardware stack as intermediate storage for the arguments.
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val argOrder = asmsub6502ArgsEvalOrder(callee)
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argOrder.reversed().forEach {
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asmgen.pushCpuStack(callee.parameters[it].first.type, call.args[it])
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}
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argOrder.forEach {
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val param = callee.parameters[it]
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TODO("pop cpu stack into asmsub param ${param.first.name} ${param.second}")
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// val targetVar = callee.searchParameter(param.name)!!
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// asmgen.popCpuStack(param.type, targetVar, call.definingISub())
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}
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}
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private fun argumentViaVariable(sub: PtSub, parameter: PtSubroutineParameter, value: PtExpression) {
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// pass parameter via a regular variable (not via registers)
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if(!isArgumentTypeCompatible(value.type, parameter.type))
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throw AssemblyError("argument type incompatible")
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val varName = asmgen.asmVariableName(sub.scopedName + parameter.name)
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asmgen.assignExpressionToVariable(value, varName, parameter.type, sub)
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}
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private fun argumentViaRegister(sub: IPtSubroutine, parameter: IndexedValue<PtSubroutineParameter>, value: PtExpression, registerOverride: RegisterOrPair? = null) {
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// pass argument via a register parameter
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if(!isArgumentTypeCompatible(value.type, parameter.value.type))
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throw AssemblyError("argument type incompatible")
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val paramRegister: RegisterOrStatusflag = when(sub) {
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is PtAsmSub -> if(registerOverride==null) sub.parameters[parameter.index].second else RegisterOrStatusflag(registerOverride, null)
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is PtSub -> RegisterOrStatusflag(registerOverride!!, null)
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}
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val statusflag = paramRegister.statusflag
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val register = paramRegister.registerOrPair
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val requiredDt = parameter.value.type
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if(requiredDt!=value.type) {
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if(value.type largerThan requiredDt)
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throw AssemblyError("can only convert byte values to word param types")
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}
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if (statusflag!=null) {
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if(requiredDt!=value.type)
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throw AssemblyError("for statusflag, byte value is required")
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if (statusflag == Statusflag.Pc) {
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// this param needs to be set last, right before the jsr
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// for now, this is already enforced on the subroutine definition by the Ast Checker
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when(value) {
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is PtNumber -> {
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val carrySet = value.number.toInt() != 0
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asmgen.out(if(carrySet) " sec" else " clc")
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}
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is PtIdentifier -> {
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val sourceName = asmgen.asmVariableName(value)
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asmgen.out("""
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pha
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clc
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lda $sourceName
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beq +
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sec
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+ pla""")
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}
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else -> {
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asmgen.assignExpressionToRegister(value, RegisterOrPair.A)
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asmgen.out("""
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beq +
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sec
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bcs ++
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+ clc
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+""")
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}
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}
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} else throw AssemblyError("can only use Carry as status flag parameter")
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}
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else {
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// via register or register pair
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register!!
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if(requiredDt largerThan value.type) {
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// we need to sign extend the source, do this via temporary word variable
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asmgen.assignExpressionToVariable(value, "P8ZP_SCRATCH_W1", DataType.UBYTE, sub)
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asmgen.signExtendVariableLsb("P8ZP_SCRATCH_W1", value.type)
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asmgen.assignVariableToRegister("P8ZP_SCRATCH_W1", register)
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} else {
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val target: AsmAssignTarget =
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if(parameter.value.type in ByteDatatypes && (register==RegisterOrPair.AX || register == RegisterOrPair.AY || register==RegisterOrPair.XY || register in Cx16VirtualRegisters))
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AsmAssignTarget(TargetStorageKind.REGISTER, asmgen, parameter.value.type, sub, register = register)
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else {
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val signed = parameter.value.type == DataType.BYTE || parameter.value.type == DataType.WORD
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AsmAssignTarget.fromRegisters(register, signed, sub, asmgen)
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}
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val src = if(value.type in PassByReferenceDatatypes) {
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if(value is PtIdentifier) {
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val addr = PtAddressOf(Position.DUMMY)
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addr.add(value)
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AsmAssignSource.fromAstSource(addr, program, asmgen).adjustSignedUnsigned(target)
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} else {
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AsmAssignSource.fromAstSource(value, program, asmgen).adjustSignedUnsigned(target)
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}
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} else {
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AsmAssignSource.fromAstSource(value, program, asmgen).adjustSignedUnsigned(target)
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}
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asmgen.translateNormalAssignment(AsmAssignment(src, target, false, program.memsizer, Position.DUMMY))
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}
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}
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}
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private fun isArgumentTypeCompatible(argType: DataType, paramType: DataType): Boolean {
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if(argType isAssignableTo paramType)
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return true
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if(argType in ByteDatatypes && paramType in ByteDatatypes)
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return true
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if(argType in WordDatatypes && paramType in WordDatatypes)
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return true
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// we have a special rule for some types.
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// strings are assignable to UWORD, for example, and vice versa
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if(argType==DataType.STR && paramType==DataType.UWORD)
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return true
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if(argType==DataType.UWORD && paramType == DataType.STR)
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return true
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return false
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}
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}
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