def compile_save(self, instr):
for location in instr.locations:
if location == REG_A:
self.emitter.emit(PHA())
elif location == REG_X:
self.emitter.emit(TXA())
self.emitter.emit(PHA())
elif location == REG_Y:
self.emitter.emit(TYA())
self.emitter.emit(PHA())
else:
src_label = self.get_label(location.name)
self.emitter.emit(LDA(Absolute(src_label)))
self.emitter.emit(PHA())
self.compile_block(instr.block)
for location in reversed(instr.locations):
if location == REG_A:
self.emitter.emit(PLA())
elif location == REG_X:
self.emitter.emit(PLA())
self.emitter.emit(TAX())
elif location == REG_Y:
self.emitter.emit(PLA())
self.emitter.emit(TAY())
else:
src_label = self.get_label(location.name)
self.emitter.emit(PLA())
self.emitter.emit(STA(Absolute(src_label)))
def compile_call(self, instr):
location = instr.location
label = self.get_label(instr.location.name)
location_type = self.get_type(location)
if isinstance(location_type, RoutineType):
self.emitter.emit(JSR(Absolute(label)))
elif isinstance(location_type, VectorType):
trampoline = self.trampolines.setdefault(
location, Label(location.name + '_trampoline'))
self.emitter.emit(JSR(Absolute(trampoline)))
else:
raise NotImplementedError(location_type)
def compile_if(self, instr):
cls = {
False: {
'c': BCC,
'z': BNE,
'n': BPL,
},
True: {
'c': BCS,
'z': BEQ,
'n': BMI,
},
}[instr.inverted].get(instr.src.name)
if cls is None:
raise UnsupportedOpcodeError(instr)
else_label = Label('else_label')
self.emitter.emit(cls(Relative(else_label)))
self.compile_block(instr.block1)
if instr.block2 is not None:
end_label = Label('end_label')
self.emitter.emit(JMP(Absolute(end_label)))
self.emitter.resolve_label(else_label)
self.compile_block(instr.block2)
self.emitter.resolve_label(end_label)
else:
self.emitter.resolve_label(else_label)
def compile_routine(self, routine, next_routine=None):
assert isinstance(routine, Routine)
self.current_routine = routine
if routine.block:
self.emitter.resolve_label(self.get_label(routine.name))
self.compile_block(routine.block)
needs_rts = True
last_op = self.emitter.get_tail()
if isinstance(last_op, JSR):
if isinstance(last_op.operand, Absolute):
if isinstance(last_op.operand.value, Label):
label = last_op.operand.value
self.emitter.retract()
self.emitter.emit(JMP(Absolute(label)))
last_op = self.emitter.get_tail()
if isinstance(last_op, JMP):
needs_rts = False
if isinstance(last_op.operand, Absolute):
if isinstance(last_op.operand.value, Label):
if next_routine and last_op.operand.value.name == next_routine.name:
self.emitter.retract()
if needs_rts:
self.emitter.emit(RTS())
self.current_routine = None
def compile_goto(self, instr):
location = instr.location
label = self.get_label(instr.location.name)
location_type = self.get_type(location)
if isinstance(location_type, RoutineType):
self.emitter.emit(JMP(Absolute(label)))
elif isinstance(location_type, VectorType):
self.emitter.emit(JMP(Indirect(label)))
else:
raise NotImplementedError(location_type)
def compile_dec(self, instr, dest):
"""`instr` is only for reporting purposes"""
if dest == REG_X:
self.emitter.emit(DEX())
elif dest == REG_Y:
self.emitter.emit(DEY())
elif isinstance(dest, IndexedRef):
mode = self.addressing_mode_for_index(dest.index)
self.emitter.emit(
DEC(
mode(
Offset(self.get_label(dest.ref.name),
dest.offset.value))))
else:
self.emitter.emit(DEC(Absolute(self.get_label(dest.name))))
def compile_repeat(self, instr):
top_label = self.emitter.make_label()
self.compile_block(instr.block)
if instr.src is None: # indicates 'repeat forever'
self.emitter.emit(JMP(Absolute(top_label)))
else:
cls = {
False: {
'c': BCC,
'z': BNE,
'n': BPL,
},
True: {
'c': BCS,
'z': BEQ,
'n': BMI,
},
}[instr.inverted].get(instr.src.name)
if cls is None:
raise UnsupportedOpcodeError(instr)
self.emitter.emit(cls(Relative(top_label)))
def compile_cmp(self, instr, src, dest):
"""`instr` is only for reporting purposes"""
if isinstance(src, LocationRef) and self.get_type(src) == TYPE_WORD:
src_label = self.get_label(src.name)
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Absolute(dest_label)))
self.emitter.emit(CMP(Absolute(src_label)))
end_label = Label('end_label')
self.emitter.emit(BNE(Relative(end_label)))
self.emitter.emit(LDA(Absolute(Offset(dest_label, 1))))
self.emitter.emit(CMP(Absolute(Offset(src_label, 1))))
self.emitter.resolve_label(end_label)
return
if isinstance(src, ConstantRef) and self.get_type(src) == TYPE_WORD:
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Absolute(dest_label)))
self.emitter.emit(CMP(Immediate(Byte(src.low_byte()))))
end_label = Label('end_label')
self.emitter.emit(BNE(Relative(end_label)))
self.emitter.emit(LDA(Absolute(Offset(dest_label, 1))))
self.emitter.emit(CMP(Immediate(Byte(src.high_byte()))))
self.emitter.resolve_label(end_label)
return
cls = {
'a': CMP,
'x': CPX,
'y': CPY,
}.get(dest.name)
if cls is None:
raise UnsupportedOpcodeError(instr)
if isinstance(src, ConstantRef):
self.emitter.emit(cls(Immediate(Byte(src.value))))
elif isinstance(src, IndexedRef):
# FIXME might not work for some dest's (that is, cls's)
mode = self.addressing_mode_for_index(src.index)
self.emitter.emit(
cls(
mode(Offset(self.get_label(src.ref.name),
src.offset.value))))
else:
self.emitter.emit(cls(Absolute(self.get_label(src.name))))
def compile_copy(self, instr, src, dest):
if isinstance(src, (IndirectRef, IndexedRef)):
src_ref_type = self.get_type(src.ref)
else:
src_type = self.get_type(src)
if isinstance(dest, (IndirectRef, IndexedRef)):
dest_ref_type = self.get_type(dest.ref)
else:
dest_type = self.get_type(dest)
if isinstance(src, ConstantRef) and isinstance(
dest, IndirectRef) and src_type == TYPE_BYTE and isinstance(
dest_ref_type, PointerType):
### copy 123, [ptr] + y
dest_label = self.get_label(dest.ref.name)
self.emitter.emit(LDA(Immediate(Byte(src.value))))
self.emitter.emit(STA(IndirectY(dest_label)))
elif isinstance(src, LocationRef) and isinstance(
dest, IndirectRef) and src_type == TYPE_BYTE and isinstance(
dest_ref_type, PointerType):
### copy b, [ptr] + y
src_label = self.get_label(src.name)
dest_label = self.get_label(dest.ref.name)
self.emitter.emit(LDA(Absolute(src_label)))
self.emitter.emit(STA(IndirectY(dest_label)))
elif isinstance(src, IndirectRef) and isinstance(
dest, LocationRef) and dest_type == TYPE_BYTE and isinstance(
src_ref_type, PointerType):
### copy [ptr] + y, b
src_label = self.get_label(src.ref.name)
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(IndirectY(src_label)))
self.emitter.emit(STA(Absolute(dest_label)))
elif isinstance(src, IndirectRef) and isinstance(
dest, IndirectRef) and isinstance(
src_ref_type, PointerType) and isinstance(
dest_ref_type, PointerType):
### copy [ptra] + y, [ptrb] + y
src_label = self.get_label(src.ref.name)
dest_label = self.get_label(dest.ref.name)
self.emitter.emit(LDA(IndirectY(src_label)))
self.emitter.emit(STA(IndirectY(dest_label)))
elif isinstance(src, LocationRef) and isinstance(
dest, IndexedRef
) and src_type == TYPE_WORD and TableType.is_a_table_type(
dest_ref_type, TYPE_WORD):
### copy w, wtab + y
src_label = self.get_label(src.name)
dest_label = self.get_label(dest.ref.name)
mode = self.addressing_mode_for_index(dest.index)
self.emitter.emit(LDA(Absolute(src_label)))
self.emitter.emit(STA(mode(Offset(dest_label, dest.offset.value))))
self.emitter.emit(LDA(Absolute(Offset(src_label, 1))))
self.emitter.emit(
STA(mode(Offset(dest_label, dest.offset.value + 256))))
elif isinstance(src, LocationRef) and isinstance(
dest, IndexedRef) and isinstance(
src_type, VectorType) and isinstance(
dest_ref_type, TableType) and isinstance(
dest_ref_type.of_type, VectorType):
### copy vec, vtab + y
# FIXME this is the exact same as above - can this be simplified?
src_label = self.get_label(src.name)
dest_label = self.get_label(dest.ref.name)
mode = self.addressing_mode_for_index(dest.index)
self.emitter.emit(LDA(Absolute(src_label)))
self.emitter.emit(STA(mode(Offset(dest_label, dest.offset.value))))
self.emitter.emit(LDA(Absolute(Offset(src_label, 1))))
self.emitter.emit(
STA(mode(Offset(dest_label, dest.offset.value + 256))))
elif isinstance(src, LocationRef) and isinstance(
dest, IndexedRef) and isinstance(
src_type, RoutineType) and isinstance(
dest_ref_type, TableType) and isinstance(
dest_ref_type.of_type, VectorType):
### copy routine, vtab + y
src_label = self.get_label(src.name)
dest_label = self.get_label(dest.ref.name)
mode = self.addressing_mode_for_index(dest.index)
self.emitter.emit(LDA(Immediate(HighAddressByte(src_label))))
self.emitter.emit(STA(mode(Offset(dest_label, dest.offset.value))))
self.emitter.emit(LDA(Immediate(LowAddressByte(src_label))))
self.emitter.emit(
STA(mode(Offset(dest_label, dest.offset.value + 256))))
elif isinstance(src, ConstantRef) and isinstance(
dest, IndexedRef
) and src_type == TYPE_WORD and TableType.is_a_table_type(
dest_ref_type, TYPE_WORD):
### copy 9999, wtab + y
dest_label = self.get_label(dest.ref.name)
mode = self.addressing_mode_for_index(dest.index)
self.emitter.emit(LDA(Immediate(Byte(src.low_byte()))))
self.emitter.emit(STA(mode(Offset(dest_label, dest.offset.value))))
self.emitter.emit(LDA(Immediate(Byte(src.high_byte()))))
self.emitter.emit(
STA(mode(Offset(dest_label, dest.offset.value + 256))))
elif isinstance(src, IndexedRef) and isinstance(
dest, LocationRef) and TableType.is_a_table_type(
src_ref_type, TYPE_WORD) and dest_type == TYPE_WORD:
### copy wtab + y, w
src_label = self.get_label(src.ref.name)
dest_label = self.get_label(dest.name)
mode = self.addressing_mode_for_index(src.index)
self.emitter.emit(LDA(mode(Offset(src_label, src.offset.value))))
self.emitter.emit(STA(Absolute(dest_label)))
self.emitter.emit(
LDA(mode(Offset(src_label, src.offset.value + 256))))
self.emitter.emit(STA(Absolute(Offset(dest_label, 1))))
elif isinstance(src, IndexedRef) and isinstance(
dest, LocationRef) and isinstance(
dest_type, VectorType) and isinstance(
src_ref_type, TableType) and isinstance(
src_ref_type.of_type, VectorType):
### copy vtab + y, vec
# FIXME this is the exact same as above - can this be simplified?
src_label = self.get_label(src.ref.name)
dest_label = self.get_label(dest.name)
mode = self.addressing_mode_for_index(src.index)
self.emitter.emit(LDA(mode(Offset(src_label, src.offset.value))))
self.emitter.emit(STA(Absolute(dest_label)))
self.emitter.emit(
LDA(mode(Offset(src_label, src.offset.value + 256))))
self.emitter.emit(STA(Absolute(Offset(dest_label, 1))))
elif src_type == TYPE_BYTE and dest_type == TYPE_BYTE and not isinstance(
src, ConstantRef):
### copy b1, b2
src_label = self.get_label(src.name)
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Absolute(src_label)))
self.emitter.emit(STA(Absolute(dest_label)))
elif src_type == TYPE_WORD and dest_type == TYPE_WORD and isinstance(
src, ConstantRef):
### copy 9999, w
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Immediate(Byte(src.low_byte()))))
self.emitter.emit(STA(Absolute(dest_label)))
self.emitter.emit(LDA(Immediate(Byte(src.high_byte()))))
self.emitter.emit(STA(Absolute(Offset(dest_label, 1))))
elif src_type == TYPE_WORD and dest_type == TYPE_WORD and not isinstance(
src, ConstantRef):
### copy w1, w2
src_label = self.get_label(src.name)
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Absolute(src_label)))
self.emitter.emit(STA(Absolute(dest_label)))
self.emitter.emit(LDA(Absolute(Offset(src_label, 1))))
self.emitter.emit(STA(Absolute(Offset(dest_label, 1))))
elif isinstance(src_type, VectorType) and isinstance(
dest_type, VectorType):
### copy v1, v2
src_label = self.get_label(src.name)
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Absolute(src_label)))
self.emitter.emit(STA(Absolute(dest_label)))
self.emitter.emit(LDA(Absolute(Offset(src_label, 1))))
self.emitter.emit(STA(Absolute(Offset(dest_label, 1))))
elif isinstance(src_type, RoutineType) and isinstance(
dest_type, VectorType):
### copy routine, vec
src_label = self.get_label(src.name)
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Immediate(HighAddressByte(src_label))))
self.emitter.emit(STA(Absolute(dest_label)))
self.emitter.emit(LDA(Immediate(LowAddressByte(src_label))))
self.emitter.emit(STA(Absolute(Offset(dest_label, 1))))
else:
raise NotImplementedError(src_type)
def compile_single_op(self, instr):
opcode = instr.opcode
dest = instr.dest
src = instr.src
if opcode == 'ld':
if dest == REG_A:
if src == REG_X:
self.emitter.emit(TXA())
elif src == REG_Y:
self.emitter.emit(TYA())
elif isinstance(src, ConstantRef):
self.emitter.emit(LDA(Immediate(Byte(src.value))))
elif isinstance(src, IndexedRef) and src.index == REG_X:
self.emitter.emit(
LDA(
AbsoluteX(
Offset(self.get_label(src.ref.name),
src.offset.value))))
elif isinstance(src, IndexedRef) and src.index == REG_Y:
self.emitter.emit(
LDA(
AbsoluteY(
Offset(self.get_label(src.ref.name),
src.offset.value))))
elif isinstance(src, IndirectRef) and isinstance(
self.get_type(src.ref), PointerType):
self.emitter.emit(
LDA(IndirectY(self.get_label(src.ref.name))))
else:
self.emitter.emit(
LDA(
self.absolute_or_zero_page(self.get_label(
src.name))))
elif dest == REG_X:
if src == REG_A:
self.emitter.emit(TAX())
elif isinstance(src, ConstantRef):
self.emitter.emit(LDX(Immediate(Byte(src.value))))
elif isinstance(src, IndexedRef) and src.index == REG_Y:
self.emitter.emit(
LDX(
AbsoluteY(
Offset(self.get_label(src.ref.name),
src.offset.value))))
else:
self.emitter.emit(
LDX(
self.absolute_or_zero_page(self.get_label(
src.name))))
elif dest == REG_Y:
if src == REG_A:
self.emitter.emit(TAY())
elif isinstance(src, ConstantRef):
self.emitter.emit(LDY(Immediate(Byte(src.value))))
elif isinstance(src, IndexedRef) and src.index == REG_X:
self.emitter.emit(
LDY(
AbsoluteX(
Offset(self.get_label(src.ref.name),
src.offset.value))))
else:
self.emitter.emit(
LDY(
self.absolute_or_zero_page(self.get_label(
src.name))))
else:
raise UnsupportedOpcodeError(instr)
elif opcode == 'st':
if dest == FLAG_C and src == ConstantRef(TYPE_BIT, 0):
self.emitter.emit(CLC())
elif dest == FLAG_C and src == ConstantRef(TYPE_BIT, 1):
self.emitter.emit(SEC())
else:
op_cls = {REG_A: STA, REG_X: STX, REG_Y: STY}.get(src, None)
if isinstance(dest, IndexedRef):
mode_cls = {
REG_X: AbsoluteX,
REG_Y: AbsoluteY,
}[dest.index]
operand = mode_cls(
Offset(self.get_label(dest.ref.name),
dest.offset.value))
elif isinstance(dest, IndirectRef) and isinstance(
self.get_type(dest.ref), PointerType):
operand = IndirectY(self.get_label(dest.ref.name))
else:
operand = self.absolute_or_zero_page(
self.get_label(dest.name))
if op_cls is None:
raise UnsupportedOpcodeError(instr)
self.emitter.emit(op_cls(operand))
elif opcode == 'add':
if dest == REG_X or dest == REG_Y:
raise UnsupportedOpcodeError(instr)
if dest == REG_A:
if isinstance(src, ConstantRef):
self.emitter.emit(ADC(Immediate(Byte(src.value))))
elif isinstance(src, IndexedRef):
mode = self.addressing_mode_for_index(src.index)
self.emitter.emit(
ADC(
mode(
Offset(self.get_label(src.ref.name),
src.offset.value))))
else:
self.emitter.emit(ADC(Absolute(self.get_label(src.name))))
elif isinstance(dest, LocationRef) and self.get_type(
src) == TYPE_BYTE and self.get_type(dest) == TYPE_BYTE:
if isinstance(src, ConstantRef):
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Absolute(dest_label)))
self.emitter.emit(ADC(Immediate(Byte(src.low_byte()))))
self.emitter.emit(STA(Absolute(dest_label)))
elif isinstance(src, LocationRef):
src_label = self.get_label(src.name)
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Absolute(dest_label)))
self.emitter.emit(ADC(Absolute(src_label)))
self.emitter.emit(STA(Absolute(dest_label)))
else:
raise UnsupportedOpcodeError(instr)
elif isinstance(dest, LocationRef) and self.get_type(
src) == TYPE_WORD and self.get_type(dest) == TYPE_WORD:
if isinstance(src, ConstantRef):
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Absolute(dest_label)))
self.emitter.emit(ADC(Immediate(Byte(src.low_byte()))))
self.emitter.emit(STA(Absolute(dest_label)))
self.emitter.emit(LDA(Absolute(Offset(dest_label, 1))))
self.emitter.emit(ADC(Immediate(Byte(src.high_byte()))))
self.emitter.emit(STA(Absolute(Offset(dest_label, 1))))
elif isinstance(src, LocationRef):
src_label = self.get_label(src.name)
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Absolute(dest_label)))
self.emitter.emit(ADC(Absolute(src_label)))
self.emitter.emit(STA(Absolute(dest_label)))
self.emitter.emit(LDA(Absolute(Offset(dest_label, 1))))
self.emitter.emit(ADC(Absolute(Offset(src_label, 1))))
self.emitter.emit(STA(Absolute(Offset(dest_label, 1))))
else:
raise UnsupportedOpcodeError(instr)
elif isinstance(dest, LocationRef) and self.get_type(
src) == TYPE_WORD and isinstance(self.get_type(dest),
PointerType):
if isinstance(src, ConstantRef):
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(ZeroPage(dest_label)))
self.emitter.emit(ADC(Immediate(Byte(src.low_byte()))))
self.emitter.emit(STA(ZeroPage(dest_label)))
self.emitter.emit(LDA(ZeroPage(Offset(dest_label, 1))))
self.emitter.emit(ADC(Immediate(Byte(src.high_byte()))))
self.emitter.emit(STA(ZeroPage(Offset(dest_label, 1))))
elif isinstance(src, LocationRef):
src_label = self.get_label(src.name)
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(ZeroPage(dest_label)))
self.emitter.emit(ADC(Absolute(src_label)))
self.emitter.emit(STA(ZeroPage(dest_label)))
self.emitter.emit(LDA(ZeroPage(Offset(dest_label, 1))))
self.emitter.emit(ADC(Absolute(Offset(src_label, 1))))
self.emitter.emit(STA(ZeroPage(Offset(dest_label, 1))))
else:
raise UnsupportedOpcodeError(instr)
else:
raise UnsupportedOpcodeError(instr)
elif opcode == 'sub':
if dest == REG_X or dest == REG_Y:
raise UnsupportedOpcodeError(instr)
if dest == REG_A:
if isinstance(src, ConstantRef):
self.emitter.emit(SBC(Immediate(Byte(src.value))))
elif isinstance(src, IndexedRef):
mode = self.addressing_mode_for_index(src.index)
self.emitter.emit(
SBC(
mode(
Offset(self.get_label(src.ref.name),
src.offset.value))))
else:
self.emitter.emit(SBC(Absolute(self.get_label(src.name))))
elif isinstance(dest, LocationRef) and self.get_type(
src) == TYPE_BYTE and self.get_type(dest) == TYPE_BYTE:
if isinstance(src, ConstantRef):
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Absolute(dest_label)))
self.emitter.emit(SBC(Immediate(Byte(src.low_byte()))))
self.emitter.emit(STA(Absolute(dest_label)))
elif isinstance(src, LocationRef):
src_label = self.get_label(src.name)
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Absolute(dest_label)))
self.emitter.emit(SBC(Absolute(src_label)))
self.emitter.emit(STA(Absolute(dest_label)))
else:
raise UnsupportedOpcodeError(instr)
elif isinstance(dest, LocationRef) and self.get_type(
src) == TYPE_WORD and self.get_type(dest) == TYPE_WORD:
if isinstance(src, ConstantRef):
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Absolute(dest_label)))
self.emitter.emit(SBC(Immediate(Byte(src.low_byte()))))
self.emitter.emit(STA(Absolute(dest_label)))
self.emitter.emit(LDA(Absolute(Offset(dest_label, 1))))
self.emitter.emit(SBC(Immediate(Byte(src.high_byte()))))
self.emitter.emit(STA(Absolute(Offset(dest_label, 1))))
elif isinstance(src, LocationRef):
src_label = self.get_label(src.name)
dest_label = self.get_label(dest.name)
self.emitter.emit(LDA(Absolute(dest_label)))
self.emitter.emit(SBC(Absolute(src_label)))
self.emitter.emit(STA(Absolute(dest_label)))
self.emitter.emit(LDA(Absolute(Offset(dest_label, 1))))
self.emitter.emit(SBC(Absolute(Offset(src_label, 1))))
self.emitter.emit(STA(Absolute(Offset(dest_label, 1))))
else:
raise UnsupportedOpcodeError(instr)
else:
raise UnsupportedOpcodeError(instr)
elif opcode == 'cmp':
self.compile_cmp(instr, instr.src, instr.dest)
elif opcode in (
'and',
'or',
'xor',
):
cls = {
'and': AND,
'or': ORA,
'xor': EOR,
}[opcode]
if dest == REG_A:
if isinstance(src, ConstantRef):
self.emitter.emit(cls(Immediate(Byte(src.value))))
elif isinstance(src, IndexedRef):
mode = self.addressing_mode_for_index(src.index)
self.emitter.emit(
cls(
mode(
Offset(self.get_label(src.ref.name),
src.offset.value))))
else:
self.emitter.emit(
cls(
self.absolute_or_zero_page(self.get_label(
src.name))))
else:
raise UnsupportedOpcodeError(instr)
elif opcode == 'inc':
self.compile_inc(instr, instr.dest)
elif opcode == 'dec':
self.compile_dec(instr, instr.dest)
elif opcode in ('shl', 'shr'):
cls = {
'shl': ROL,
'shr': ROR,
}[opcode]
if dest == REG_A:
self.emitter.emit(cls())
elif isinstance(dest, IndexedRef):
mode = self.addressing_mode_for_index(dest.index)
self.emitter.emit(
cls(
mode(
Offset(self.get_label(dest.ref.name),
dest.offset.value))))
else:
self.emitter.emit(
cls(self.absolute_or_zero_page(self.get_label(dest.name))))
elif opcode == 'copy':
self.compile_copy(instr, instr.src, instr.dest)
elif opcode == 'trash':
pass
elif opcode == 'nop':
self.emitter.emit(NOP())
else:
raise NotImplementedError(opcode)
def absolute_or_zero_page(self, label):
if label.addr is not None and label.addr < 256:
return ZeroPage(label)
else:
return Absolute(label)