mirror of
https://github.com/irmen/prog8.git
synced 2024-05-29 01:41:32 +00:00
244 lines
12 KiB
Kotlin
244 lines
12 KiB
Kotlin
package prog8.codegen.cpu6502
|
|
|
|
import prog8.code.ast.*
|
|
import prog8.code.core.*
|
|
import prog8.codegen.cpu6502.assignment.AsmAssignSource
|
|
import prog8.codegen.cpu6502.assignment.AsmAssignTarget
|
|
import prog8.codegen.cpu6502.assignment.AsmAssignment
|
|
import prog8.codegen.cpu6502.assignment.TargetStorageKind
|
|
|
|
|
|
internal class FunctionCallAsmGen(private val program: PtProgram, private val asmgen: AsmGen6502Internal) {
|
|
|
|
internal fun translateFunctionCallStatement(stmt: PtFunctionCall) {
|
|
translateFunctionCall(stmt)
|
|
// just ignore any result values from the function call.
|
|
}
|
|
|
|
internal fun optimizeIntArgsViaRegisters(sub: PtSub) =
|
|
(sub.parameters.size==1 && sub.parameters[0].type in IntegerDatatypesWithBoolean)
|
|
|| (sub.parameters.size==2 && sub.parameters[0].type in ByteDatatypesWithBoolean && sub.parameters[1].type in ByteDatatypesWithBoolean)
|
|
|
|
internal fun translateFunctionCall(call: PtFunctionCall) {
|
|
// Output only the code to set up the parameters and perform the actual call
|
|
// NOTE: does NOT output the code to deal with the result values!
|
|
// NOTE: does NOT output code to save/restore the X register for this call! Every caller should deal with this in their own way!!
|
|
// (you can use subroutine.shouldSaveX() and saveX()/restoreX() routines as a help for this)
|
|
|
|
val symbol = asmgen.symbolTable.lookup(call.name)
|
|
val sub = symbol?.astNode as IPtSubroutine
|
|
val subAsmName = asmgen.asmSymbolName(call.name)
|
|
|
|
if(sub is PtAsmSub) {
|
|
argumentsViaRegisters(sub, call)
|
|
if (sub.inline) {
|
|
// inline the subroutine. (regardless of optimization settings!)
|
|
// we do this by copying the subroutine's statements at the call site.
|
|
// NOTE: *if* there is a return statement, it will be the only one, and the very last statement of the subroutine
|
|
// (this condition has been enforced by an ast check earlier)
|
|
asmgen.out(" \t; inlined routine follows: ${sub.name}")
|
|
sub.children.forEach { asmgen.translate(it as PtInlineAssembly) }
|
|
asmgen.out(" \t; inlined routine end: ${sub.name}")
|
|
} else {
|
|
asmgen.out(" jsr $subAsmName")
|
|
}
|
|
}
|
|
else if(sub is PtSub) {
|
|
if(optimizeIntArgsViaRegisters(sub)) {
|
|
if(sub.parameters.size==1) {
|
|
val register = if (sub.parameters[0].type in ByteDatatypesWithBoolean) RegisterOrPair.A else RegisterOrPair.AY
|
|
argumentViaRegister(sub, IndexedValue(0, sub.parameters[0]), call.args[0], register)
|
|
} else {
|
|
// 2 byte params, second in Y, first in A
|
|
argumentViaRegister(sub, IndexedValue(0, sub.parameters[0]), call.args[0], RegisterOrPair.A)
|
|
if(asmgen.needAsaveForExpr(call.args[1]))
|
|
asmgen.out(" pha")
|
|
argumentViaRegister(sub, IndexedValue(1, sub.parameters[1]), call.args[1], RegisterOrPair.Y)
|
|
if(asmgen.needAsaveForExpr(call.args[1]))
|
|
asmgen.out(" pla")
|
|
}
|
|
} else {
|
|
// arguments via variables
|
|
for(arg in sub.parameters.withIndex().zip(call.args))
|
|
argumentViaVariable(sub, arg.first.value, arg.second)
|
|
}
|
|
asmgen.out(" jsr $subAsmName")
|
|
}
|
|
else throw AssemblyError("invalid sub type")
|
|
|
|
// remember: dealing with the X register and/or dealing with return values is the responsibility of the caller
|
|
}
|
|
|
|
|
|
private fun usesOtherRegistersWhileEvaluating(arg: PtExpression): Boolean {
|
|
return when(arg) {
|
|
is PtBuiltinFunctionCall -> {
|
|
if (arg.name == "lsb" || arg.name == "msb")
|
|
return usesOtherRegistersWhileEvaluating(arg.args[0])
|
|
if (arg.name == "mkword")
|
|
return usesOtherRegistersWhileEvaluating(arg.args[0]) || usesOtherRegistersWhileEvaluating(arg.args[1])
|
|
return !arg.isSimple()
|
|
}
|
|
is PtAddressOf -> false
|
|
is PtIdentifier -> false
|
|
is PtIrRegister -> false
|
|
is PtMemoryByte -> return usesOtherRegistersWhileEvaluating(arg.address)
|
|
is PtNumber -> false
|
|
is PtBool -> false
|
|
else -> true
|
|
}
|
|
}
|
|
|
|
private fun argumentsViaRegisters(sub: PtAsmSub, call: PtFunctionCall) {
|
|
val registersUsed = mutableListOf<RegisterOrStatusflag>()
|
|
|
|
fun usedA() = registersUsed.any {it.registerOrPair==RegisterOrPair.A || it.registerOrPair==RegisterOrPair.AX || it.registerOrPair==RegisterOrPair.AY}
|
|
fun usedX() = registersUsed.any {it.registerOrPair==RegisterOrPair.X || it.registerOrPair==RegisterOrPair.AX || it.registerOrPair==RegisterOrPair.XY}
|
|
fun usedY() = registersUsed.any {it.registerOrPair==RegisterOrPair.Y || it.registerOrPair==RegisterOrPair.AY || it.registerOrPair==RegisterOrPair.XY}
|
|
|
|
if(sub.parameters.size==1) {
|
|
argumentViaRegister(sub, IndexedValue(0, sub.parameters.single().second), call.args[0])
|
|
} else {
|
|
val optimalEvalOrder = asmsub6502ArgsEvalOrder(sub)
|
|
optimalEvalOrder.forEach {
|
|
val param = sub.parameters[it]
|
|
val arg = call.args[it]
|
|
registersUsed += if(usesOtherRegistersWhileEvaluating(arg)) {
|
|
if(!registersUsed.any{it.statusflag!=null || it.registerOrPair in CpuRegisters})
|
|
argumentViaRegister(sub, IndexedValue(it, param.second), arg)
|
|
else if(registersUsed.any {it.statusflag!=null}) {
|
|
throw AssemblyError("call argument evaluation problem: can't save cpu statusregister parameter ${call.position}")
|
|
}
|
|
else {
|
|
if(usedX()) asmgen.saveRegisterStack(CpuRegister.X, false)
|
|
if(usedY()) asmgen.saveRegisterStack(CpuRegister.Y, false)
|
|
if(usedA()) asmgen.saveRegisterStack(CpuRegister.A, false)
|
|
val used = argumentViaRegister(sub, IndexedValue(it, param.second), arg)
|
|
if(usedA()) asmgen.restoreRegisterStack(CpuRegister.A, false)
|
|
if(usedY()) asmgen.restoreRegisterStack(CpuRegister.Y, true)
|
|
if(usedX()) asmgen.restoreRegisterStack(CpuRegister.X, true)
|
|
used
|
|
}
|
|
} else {
|
|
argumentViaRegister(sub, IndexedValue(it, param.second), arg)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
private fun argumentViaVariable(sub: PtSub, parameter: PtSubroutineParameter, value: PtExpression) {
|
|
// pass parameter via a regular variable (not via registers)
|
|
if(!isArgumentTypeCompatible(value.type, parameter.type))
|
|
throw AssemblyError("argument type incompatible")
|
|
|
|
val varName = asmgen.asmVariableName(sub.scopedName + "." + parameter.name)
|
|
asmgen.assignExpressionToVariable(value, varName, parameter.type)
|
|
}
|
|
|
|
private fun argumentViaRegister(sub: IPtSubroutine, parameter: IndexedValue<PtSubroutineParameter>, value: PtExpression, registerOverride: RegisterOrPair? = null): RegisterOrStatusflag {
|
|
// pass argument via a register parameter
|
|
if(!isArgumentTypeCompatible(value.type, parameter.value.type))
|
|
throw AssemblyError("argument type incompatible")
|
|
|
|
val paramRegister: RegisterOrStatusflag = when(sub) {
|
|
is PtAsmSub -> if(registerOverride==null) sub.parameters[parameter.index].first else RegisterOrStatusflag(registerOverride, null)
|
|
is PtSub -> RegisterOrStatusflag(registerOverride!!, null)
|
|
}
|
|
val statusflag = paramRegister.statusflag
|
|
val register = paramRegister.registerOrPair
|
|
val requiredDt = parameter.value.type
|
|
if(requiredDt!=value.type) {
|
|
if(value.type largerThan requiredDt)
|
|
throw AssemblyError("can only convert byte values to word param types")
|
|
}
|
|
if (statusflag!=null) {
|
|
if(requiredDt!=value.type)
|
|
throw AssemblyError("for statusflag, byte or bool value is required")
|
|
if (statusflag == Statusflag.Pc) {
|
|
// this boolean param needs to be set last, right before the jsr
|
|
// for now, this is already enforced on the subroutine definition by the Ast Checker
|
|
when(value) {
|
|
is PtNumber -> {
|
|
val carrySet = value.number.toInt() != 0
|
|
asmgen.out(if(carrySet) " sec" else " clc")
|
|
}
|
|
is PtBool -> {
|
|
asmgen.out(if(value.value) " sec" else " clc")
|
|
}
|
|
is PtIdentifier -> {
|
|
val sourceName = asmgen.asmVariableName(value)
|
|
// note: cannot use X register here to store A because it might be used for other arguments
|
|
asmgen.out("""
|
|
pha
|
|
clc
|
|
lda $sourceName
|
|
beq +
|
|
sec
|
|
+ pla""")
|
|
}
|
|
else -> {
|
|
asmgen.assignExpressionToRegister(value, RegisterOrPair.A)
|
|
asmgen.out(" ror a")
|
|
}
|
|
}
|
|
} else throw AssemblyError("can only use Carry as status flag parameter")
|
|
return RegisterOrStatusflag(null, statusflag)
|
|
}
|
|
else {
|
|
// via register or register pair
|
|
register!!
|
|
if(requiredDt largerThan value.type) {
|
|
// we need to sign extend the source, do this via temporary word variable
|
|
asmgen.assignExpressionToVariable(value, "P8ZP_SCRATCH_W1", DataType.UBYTE)
|
|
asmgen.signExtendVariableLsb("P8ZP_SCRATCH_W1", value.type)
|
|
asmgen.assignVariableToRegister("P8ZP_SCRATCH_W1", register, null, Position.DUMMY)
|
|
} else {
|
|
val scope = value.definingISub()
|
|
val target: AsmAssignTarget =
|
|
if(parameter.value.type in ByteDatatypes && (register==RegisterOrPair.AX || register == RegisterOrPair.AY || register==RegisterOrPair.XY || register in Cx16VirtualRegisters))
|
|
AsmAssignTarget(TargetStorageKind.REGISTER, asmgen, parameter.value.type, scope, value.position, register = register)
|
|
else {
|
|
val signed = parameter.value.type == DataType.BYTE || parameter.value.type == DataType.WORD
|
|
AsmAssignTarget.fromRegisters(register, signed, value.position, scope, asmgen)
|
|
}
|
|
val src = if(value.type in PassByReferenceDatatypes) {
|
|
if(value is PtIdentifier) {
|
|
val addr = PtAddressOf(Position.DUMMY)
|
|
addr.add(value)
|
|
addr.parent = sub as PtNode
|
|
AsmAssignSource.fromAstSource(addr, program, asmgen).adjustSignedUnsigned(target)
|
|
} else {
|
|
AsmAssignSource.fromAstSource(value, program, asmgen).adjustSignedUnsigned(target)
|
|
}
|
|
} else {
|
|
AsmAssignSource.fromAstSource(value, program, asmgen).adjustSignedUnsigned(target)
|
|
}
|
|
asmgen.translateNormalAssignment(AsmAssignment(src, target, program.memsizer, Position.DUMMY), scope)
|
|
}
|
|
return RegisterOrStatusflag(register, null)
|
|
}
|
|
}
|
|
|
|
private fun isArgumentTypeCompatible(argType: DataType, paramType: DataType): Boolean {
|
|
if(argType isAssignableTo paramType)
|
|
return true
|
|
if(argType==DataType.BOOL && paramType==DataType.BOOL)
|
|
return true
|
|
if(argType in ByteDatatypes && paramType in ByteDatatypes)
|
|
return true
|
|
if(argType in WordDatatypes && paramType in WordDatatypes)
|
|
return true
|
|
|
|
// we have a special rule for some types.
|
|
// strings are assignable to UWORD, for example, and vice versa
|
|
if(argType==DataType.STR && paramType==DataType.UWORD)
|
|
return true
|
|
if(argType==DataType.UWORD && paramType == DataType.STR)
|
|
return true
|
|
|
|
return false
|
|
}
|
|
}
|
|
|
|
|