# Copyright (c) 2014-2024, Chris Pressey, Cat's Eye Technologies.
# This file is distributed under a 2-clause BSD license. See LICENSES/ dir.
# SPDX-License-Identifier: LicenseRef-BSD-2-Clause-X-SixtyPical
# encoding: UTF-8
from sixtypical.ast import (
Program, Routine, Block, SingleOp, Reset, Call, GoTo, If, Repeat, For, WithInterruptsOff, Save, PointInto
)
from sixtypical.model import (
ConstantRef, LocationRef, IndexedRef, IndirectRef,
TYPE_BIT, TYPE_BYTE, TYPE_WORD,
TableType, PointerType, RoutineType, VectorType,
REG_A, REG_X, REG_Y, FLAG_C
)
from sixtypical.emitter import Byte, Word, Table, Label, Offset, LowAddressByte, HighAddressByte
from sixtypical.gen6502 import (
Immediate, Absolute, AbsoluteX, AbsoluteY, ZeroPage, Indirect, IndirectY, Relative,
LDA, LDX, LDY, STA, STX, STY,
TAX, TAY, TXA, TYA,
PHA, PLA,
CLC, SEC, ADC, SBC, ROL, ROR,
INC, INX, INY, DEC, DEX, DEY,
CMP, CPX, CPY, AND, ORA, EOR,
BCC, BCS, BNE, BEQ, BPL, BMI,
JMP, JSR, RTS,
SEI, CLI,
NOP,
)
class UnsupportedOpcodeError(KeyError):
pass
class Compiler(object):
def __init__(self, symtab, emitter):
self.symtab = symtab
self.emitter = emitter
self.routines = {} # routine.name -> Routine
self.routine_locals = {} # routine.name -> { local.name -> Label }
self.labels = {} # global.name -> Label ("global" includes routines)
self.trampolines = {} # Location -> Label
self.pointer_assoc = {} # pointer name -> table name (I'm not entirely happy about this)
self.current_routine = None
# - - - - helper methods - - - -
def get_type_for_name(self, name):
if self.current_routine and self.symtab.has_local(self.current_routine.name, name):
return self.symtab.fetch_local_type(self.current_routine.name, name)
return self.symtab.fetch_global_type(name)
def get_type(self, ref):
if isinstance(ref, ConstantRef):
return ref.type
if not isinstance(ref, LocationRef):
raise NotImplementedError
return self.get_type_for_name(ref.name)
def addressing_mode_for_index(self, index):
if index == REG_X:
return AbsoluteX
elif index == REG_Y:
return AbsoluteY
else:
raise NotImplementedError(index)
def compute_length_of_defn(self, defn):
length = None
type_ = self.get_type_for_name(defn.name)
if type_ == TYPE_BYTE:
length = 1
elif type_ == TYPE_WORD or isinstance(type_, (PointerType, VectorType)):
length = 2
elif isinstance(type_, TableType):
length = type_.size * (1 if type_.of_type == TYPE_BYTE else 2)
if length is None:
raise NotImplementedError("Need size for type {}".format(type_))
return length
def get_label(self, name):
if self.current_routine:
local_label = self.routine_locals.get(self.current_routine.name, {}).get(name)
if local_label:
return local_label
return self.labels[name]
def absolute_or_zero_page(self, label):
if label.addr is not None and label.addr < 256:
return ZeroPage(label)
else:
return Absolute(label)
# - - - - visitor methods - - - -
def compile_program(self, program, compilation_roster=None):
assert isinstance(program, Program)
declarations = []
for defn in program.defns:
length = self.compute_length_of_defn(defn)
label = Label(defn.name, addr=defn.addr, length=length)
self.labels[defn.name] = label
declarations.append((defn, self.symtab.fetch_global_type(defn.name), label))
for routine in program.routines:
self.routines[routine.name] = routine
label = Label(routine.name)
if routine.addr is not None:
label.set_addr(routine.addr)
self.labels[routine.name] = label
self.current_routine = routine
local_labels = {}
for defn in routine.locals:
length = self.compute_length_of_defn(defn)
label = Label(defn.name, addr=defn.addr, length=length)
local_labels[defn.name] = label
declarations.append((defn, self.symtab.fetch_local_type(routine.name, defn.name), label))
self.routine_locals[routine.name] = local_labels
self.current_routine = None
if compilation_roster is None:
compilation_roster = [['main']] + [[routine.name] for routine in program.routines if routine.name != 'main']
for roster_row in compilation_roster:
for i, routine_name in enumerate(roster_row):
if i < len(roster_row) - 1:
self.compile_routine(self.routines[routine_name], next_routine=self.routines[roster_row[i + 1]])
else:
self.compile_routine(self.routines[routine_name])
for location, label in self.trampolines.items():
self.emitter.resolve_label(label)
self.emitter.emit(JMP(Indirect(self.get_label(location.name))))
self.emitter.emit(RTS())
# initialized data
for defn, type_, label in declarations:
if defn.initial is not None:
initial_data = None
if type_ == TYPE_BYTE:
initial_data = Byte(defn.initial)
elif type_ == TYPE_WORD:
initial_data = Word(defn.initial)
elif TableType.is_a_table_type(type_, TYPE_BYTE):
initial_data = Table([Byte(i) for i in defn.initial], type_.size)
elif TableType.is_a_table_type(type_, TYPE_WORD):
initial_data = Table([Word(i) for i in defn.initial], type_.size)
else:
raise NotImplementedError(type_)
label.set_length(initial_data.size())
self.emitter.resolve_label(label)
self.emitter.emit(initial_data)
# uninitialized, "BSS" data
for defn, type_, label in declarations:
if defn.initial is None and defn.addr is None:
self.emitter.resolve_bss_label(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_block(self, block):
assert isinstance(block, Block)
block.shallow_contains_goto = False
for instr in block.instrs:
self.compile_instr(instr)
if isinstance(instr, GoTo):
block.shallow_contains_goto = True
def compile_instr(self, instr):
if isinstance(instr, SingleOp):
return self.compile_single_op(instr)
elif isinstance(instr, Call):
return self.compile_call(instr)
elif isinstance(instr, GoTo):
return self.compile_goto(instr)
elif isinstance(instr, If):
return self.compile_if(instr)
elif isinstance(instr, Repeat):
return self.compile_repeat(instr)
elif isinstance(instr, For):
return self.compile_for(instr)
elif isinstance(instr, WithInterruptsOff):
return self.compile_with_interrupts_off(instr)
elif isinstance(instr, Save):
return self.compile_save(instr)
elif isinstance(instr, PointInto):
return self.compile_point_into(instr)
elif isinstance(instr, Reset):
return self.compile_reset(instr)
else:
raise NotImplementedError
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 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_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_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_inc(self, instr, dest):
"""`instr` is only for reporting purposes"""
if dest == REG_X:
self.emitter.emit(INX())
elif dest == REG_Y:
self.emitter.emit(INY())
elif isinstance(dest, IndexedRef):
mode = self.addressing_mode_for_index(dest.index)
self.emitter.emit(INC(mode(Offset(self.get_label(dest.ref.name), dest.offset.value))))
else:
self.emitter.emit(INC(Absolute(self.get_label(dest.name))))
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_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_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:
if instr.block1.shallow_contains_goto:
self.emitter.resolve_label(else_label)
self.compile_block(instr.block2)
else:
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_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_for(self, instr):
top_label = self.emitter.make_label()
self.compile_block(instr.block)
if instr.direction > 0:
self.compile_inc(instr, instr.dest)
final = instr.final.succ()
elif instr.direction < 0:
self.compile_dec(instr, instr.dest)
final = instr.final.pred()
self.compile_cmp(instr, final, instr.dest)
self.emitter.emit(BNE(Relative(top_label)))
def compile_with_interrupts_off(self, instr):
self.emitter.emit(SEI())
self.compile_block(instr.block)
self.emitter.emit(CLI())
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_point_into(self, instr):
self.pointer_assoc[instr.pointer.name] = instr.table.name
self.compile_block(instr.block)
del self.pointer_assoc[instr.pointer.name]
def compile_reset(self, instr):
table_name = self.pointer_assoc[instr.pointer.name]
src_label = Offset(self.get_label(table_name), instr.offset.value)
dest_label = self.get_label(instr.pointer.name)
self.emitter.emit(LDA(Immediate(HighAddressByte(src_label))))
self.emitter.emit(STA(ZeroPage(dest_label)))
self.emitter.emit(LDA(Immediate(LowAddressByte(src_label))))
self.emitter.emit(STA(ZeroPage(Offset(dest_label, 1))))