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don't clobber A when trying to save X at functioncall
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35aebbc209
commit
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@ -552,55 +552,60 @@ internal class AsmGen(private val program: Program,
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internal fun fixNameSymbols(name: String) = name.replace("<", "prog8_").replace(">", "") // take care of the autogenerated invalid (anon) label names
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internal fun fixNameSymbols(name: String) = name.replace("<", "prog8_").replace(">", "") // take care of the autogenerated invalid (anon) label names
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internal fun saveRegister(register: CpuRegister, forFuncCall: Boolean = false, dontClobberA: Boolean = false) {
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private val saveRegisterLabels = Stack<String>();
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internal fun saveRegister(register: CpuRegister, forFuncCall: Boolean = false) {
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when(register) {
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when(register) {
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CpuRegister.A -> out(" pha")
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CpuRegister.A -> out(" pha")
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CpuRegister.X -> {
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CpuRegister.X -> {
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// TODO get rid of REG_X altogheter! replace with sta _save | txa | pha | lda _save
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// TODO get rid of REG_X altogether!
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when {
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when {
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CompilationTarget.instance.machine.cpu == CpuType.CPU65c02 -> out(" phx")
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CompilationTarget.instance.machine.cpu == CpuType.CPU65c02 -> out(" phx")
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forFuncCall -> {
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forFuncCall -> {
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if(dontClobberA)
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val save = makeLabel("saveX")
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out(" sta P8ZP_SCRATCH_REG | txa | pha | lda P8ZP_SCRATCH_REG")
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saveRegisterLabels.push(save)
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else
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out("""
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out(" txa | pha")
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stx $save
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jmp +
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$save .byte 0
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+""")
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}
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}
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else -> out(" stx P8ZP_SCRATCH_REG_X")
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else -> out(" stx P8ZP_SCRATCH_REG_X")
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}
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}
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}
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}
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CpuRegister.Y -> {
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CpuRegister.Y -> {
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when {
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if (CompilationTarget.instance.machine.cpu == CpuType.CPU65c02) out(" phy")
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CompilationTarget.instance.machine.cpu == CpuType.CPU65c02 -> out(" phy")
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else {
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dontClobberA -> out(" sta P8ZP_SCRATCH_REG | tya | pha | lda P8ZP_SCRATCH_REG")
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val save = makeLabel("saveY")
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else -> out(" tya | pha")
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out("""
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sty $save
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jmp +
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$save .byte 0
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+""")
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}
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}
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}
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}
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}
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}
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}
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}
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internal fun restoreRegister(register: CpuRegister, forFuncCall: Boolean = false, dontClobberA: Boolean=false) {
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internal fun restoreRegister(register: CpuRegister, forFuncCall: Boolean = false) {
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when(register) {
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when(register) {
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CpuRegister.A -> {
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CpuRegister.A -> out(" pla")
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require(!dontClobberA)
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out(" pla")
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}
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CpuRegister.X -> {
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CpuRegister.X -> {
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when {
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when {
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CompilationTarget.instance.machine.cpu == CpuType.CPU65c02 -> out(" plx")
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CompilationTarget.instance.machine.cpu == CpuType.CPU65c02 -> out(" plx")
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forFuncCall -> {
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forFuncCall -> {
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if(dontClobberA)
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val save = saveRegisterLabels.pop()
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out(" sta P8ZP_SCRATCH_REG | pla | tax | lda P8ZP_SCRATCH_REG")
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out(" ldx $save")
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else
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out(" pla | tax")
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}
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}
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else -> out(" ldx P8ZP_SCRATCH_REG_X")
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else -> out(" ldx P8ZP_SCRATCH_REG_X")
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}
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}
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}
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}
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CpuRegister.Y -> {
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CpuRegister.Y -> {
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when {
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if (CompilationTarget.instance.machine.cpu == CpuType.CPU65c02) out(" ply")
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CompilationTarget.instance.machine.cpu == CpuType.CPU65c02 -> out(" ply")
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else {
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dontClobberA -> out(" sta P8ZP_SCRATCH_REG | pla | tay | lda P8ZP_SCRATCH_REG")
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val save = saveRegisterLabels.pop()
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else -> out(" pla | tay")
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out(" ldy $save")
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}
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}
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}
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}
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}
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}
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@ -19,7 +19,7 @@ internal class FunctionCallAsmGen(private val program: Program, private val asmg
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val sub = stmt.target.targetSubroutine(program.namespace) ?: throw AssemblyError("undefined subroutine ${stmt.target}")
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val sub = stmt.target.targetSubroutine(program.namespace) ?: throw AssemblyError("undefined subroutine ${stmt.target}")
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val saveX = CpuRegister.X in sub.asmClobbers || sub.regXasResult() || sub.regXasParam()
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val saveX = CpuRegister.X in sub.asmClobbers || sub.regXasResult() || sub.regXasParam()
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if(saveX)
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if(saveX)
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asmgen.saveRegister(CpuRegister.X, forFuncCall = true, dontClobberA = false) // we only save X for now (required! is the eval stack pointer), screw A and Y...
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asmgen.saveRegister(CpuRegister.X, forFuncCall = true)
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val subName = asmgen.asmSymbolName(stmt.target)
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val subName = asmgen.asmSymbolName(stmt.target)
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if(stmt.args.isNotEmpty()) {
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if(stmt.args.isNotEmpty()) {
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@ -58,7 +58,7 @@ internal class FunctionCallAsmGen(private val program: Program, private val asmg
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asmgen.out(" jsr $subName")
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asmgen.out(" jsr $subName")
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if(saveX)
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if(saveX)
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asmgen.restoreRegister(CpuRegister.X, forFuncCall = true, dontClobberA = false)
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asmgen.restoreRegister(CpuRegister.X, forFuncCall = true)
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}
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}
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private fun registerArgsViaStackEvaluation(stmt: IFunctionCall, sub: Subroutine) {
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private fun registerArgsViaStackEvaluation(stmt: IFunctionCall, sub: Subroutine) {
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@ -248,7 +248,6 @@ waitkey:
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c64.CHROUT('K')
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c64.CHROUT('K')
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while c64.GETIN()!=133 {
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while c64.GETIN()!=133 {
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; TODO FIX THIS, DOESN'T TRIGGER ANYMORE ON F1
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; endless loop until user presses F1 to restart the game
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; endless loop until user presses F1 to restart the game
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}
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}
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}
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}
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@ -1,5 +1,4 @@
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%target cx16
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%import c64textio
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%import cx16textio
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;%import c64flt
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;%import c64flt
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;%option enable_floats
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;%option enable_floats
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; %zeropage kernalsafe
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; %zeropage kernalsafe
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