1544 lines
45 KiB
Python
1544 lines
45 KiB
Python
import argparse
|
|
import ast
|
|
import collections
|
|
import contextlib
|
|
from dataclasses import dataclass
|
|
import importlib
|
|
import inspect
|
|
import io
|
|
import os
|
|
import re
|
|
import struct
|
|
import subprocess
|
|
import sys
|
|
|
|
import lark
|
|
|
|
asmod = importlib.import_module("as")
|
|
|
|
_HERE = os.path.dirname(__file__)
|
|
GRAMMAR_FILE = os.path.join(_HERE, 'cc.ebnf')
|
|
CPP = ('cpp', '-P')
|
|
|
|
|
|
class Scope:
|
|
def __init__(self):
|
|
self.symbols = {}
|
|
self.parent = None
|
|
self.structs = {}
|
|
|
|
|
|
class Variable:
|
|
def __init__(self, type, name, addr_reg=None):
|
|
self.type = type
|
|
self.name = name
|
|
self.addr_reg = addr_reg
|
|
|
|
def __repr__(self):
|
|
return f'<Var: {self.type} {self.name}>'
|
|
|
|
def __str__(self):
|
|
return self.name
|
|
|
|
@classmethod
|
|
def from_def(cls, tree):
|
|
type = tree.children[0]
|
|
name = tree.children[1]
|
|
return cls(type, name)
|
|
|
|
@classmethod
|
|
def from_dereference(cls, reg, tree):
|
|
return cls(tree.type.pointed, 'deref', addr_reg=reg)
|
|
|
|
|
|
# - all registers pointing to unwritten stuff can be dropped as soon as we're
|
|
# done with them:
|
|
# - already fed them into the operations
|
|
# - end of statement
|
|
# - maybe should have a separate storeage for special registers?
|
|
# need ways to:
|
|
# - assign a list of registers into r0, ... rn for function call
|
|
# - ... and run all callbacks
|
|
# - get the register for an identifier
|
|
# - dereference an expression:
|
|
# - essentially turn a temp into an lvalue-address
|
|
# - if read, need a second reg for its value
|
|
# - mark a variable to have its address in a register
|
|
# - delay reading the identifier if it's lhs
|
|
# - store the value to memory when registers are claimed
|
|
# - if it was modified through:
|
|
# - assignment
|
|
# - pre-post *crement
|
|
# - retrieve the memory type:
|
|
# - stack
|
|
# - absolute
|
|
# - register
|
|
# - or just store the value when the variable is assigned
|
|
# - get a temporary register
|
|
# - return it
|
|
# - I guess dereferencing is an upgrade
|
|
|
|
def type(self, tree):
|
|
print(tree)
|
|
|
|
|
|
def allregs():
|
|
return (f'r{i}' for i in range(12))
|
|
|
|
|
|
class RegBank:
|
|
def __init__(self, logger=None):
|
|
self.reset()
|
|
self.log = logger or print
|
|
|
|
def reset(self):
|
|
self.available = list(allregs())
|
|
self.vars = {}
|
|
self.varregs = {}
|
|
self.cleanup = collections.defaultdict(list)
|
|
self.taken = {}
|
|
|
|
def __str__(self):
|
|
return f'regs(avail={self.available}, vars={self.vars})'
|
|
|
|
def take(self, reg=None, orwhatever=False):
|
|
out = self._take(reg=reg, orwhatever=orwhatever)
|
|
self.taken[out] = inspect.stack()[1]
|
|
return out
|
|
|
|
def _take(self, reg=None, orwhatever=False):
|
|
if reg is not None:
|
|
if reg not in self.available:
|
|
if reg in self.varregs:
|
|
self.evict(self.var(reg))
|
|
elif orwhatever:
|
|
return self._take()
|
|
else:
|
|
raise RuntimeError(
|
|
f'trying to overtake {reg}, '
|
|
f'varregs: {self.varregs}, vars: {self.vars}, '
|
|
f'taken in {self.taken[reg]}')
|
|
if reg in self.available:
|
|
self.available.remove(reg)
|
|
return reg
|
|
if not self.available:
|
|
assert self.vars, "nothing to clean, no more regs :/"
|
|
# storing one random var
|
|
var = list(self.vars.keys())[0]
|
|
self.evict(var)
|
|
return self.available.pop(0)
|
|
|
|
def give(self, reg):
|
|
assert reg is not None
|
|
if reg in self.varregs:
|
|
# Need to call evict() with the var to free it.
|
|
return
|
|
self.available.insert(0, reg)
|
|
|
|
def loaded(self, var, reg, cleanup=None):
|
|
"""Tells the regbank some variable was loaded into the given register."""
|
|
assert reg is not None
|
|
assert var is not None
|
|
self.vars[var] = reg
|
|
self.varregs[reg] = var
|
|
self.take(reg)
|
|
if cleanup is not None:
|
|
self.log(f'recording cleanup for {reg}({var})')
|
|
self.cleanup[reg].append(cleanup)
|
|
|
|
def stored(self, var):
|
|
"""Tells the regbank the given var was stored to memory, register can be freed."""
|
|
assert var in self.vars
|
|
reg = self.vars.pop(var)
|
|
del self.varregs[reg]
|
|
self.give(reg)
|
|
|
|
def load(self, var):
|
|
"""Returns the reg associated with the var, or a new reg if none was,
|
|
and True if the var was created, False otherwise."""
|
|
self.log(f'vars: {self.vars}, varregs: {self.varregs}')
|
|
if var not in self.vars:
|
|
reg = self.take()
|
|
self.vars[var] = reg
|
|
self.varregs[reg] = var
|
|
return reg, True
|
|
return self.vars[var], False
|
|
|
|
def assign(self, var, reg, cleanup=None):
|
|
"""Assign a previously-used register to a variable."""
|
|
assert reg is not None
|
|
if var in self.vars:
|
|
self.stored(var)
|
|
if reg in self.varregs:
|
|
for cb in self.cleanup.pop(reg, []):
|
|
cb(reg)
|
|
self.stored(self.varregs[reg])
|
|
self.vars[var] = reg
|
|
self.varregs[reg] = var
|
|
if cleanup is not None:
|
|
self.cleanup[reg].append(cleanup)
|
|
|
|
def var(self, reg):
|
|
return self.varregs.get(reg, None)
|
|
|
|
def evict_all(self):
|
|
for var in list(self.vars):
|
|
self.evict(var)
|
|
|
|
def evict(self, var):
|
|
"""Runs var callbacks & frees the register."""
|
|
assert var in self.vars, f'trying to evict {var}'
|
|
self.log(f'evicting {var}')
|
|
if var not in self.vars:
|
|
return
|
|
reg = self.vars[var]
|
|
for cb in self.cleanup.pop(reg, []):
|
|
cb(reg)
|
|
self.stored(var)
|
|
|
|
def drop_temps(self):
|
|
for reg in allregs():
|
|
if reg not in self.available and reg not in self.varregs:
|
|
self.give(reg)
|
|
|
|
def swapped(self, reg0, reg1):
|
|
var0 = self.varregs.get(reg0, None)
|
|
var1 = self.varregs.get(reg1, None)
|
|
|
|
if var0 is not None:
|
|
self.stored(var0)
|
|
elif reg0 not in self.available:
|
|
self.give(reg0)
|
|
|
|
if var1 is not None:
|
|
self.stored(var1)
|
|
elif reg1 not in self.available:
|
|
self.give(reg1)
|
|
|
|
if var0 is not None:
|
|
self.loaded(var0, reg1)
|
|
if var1 is not None:
|
|
self.loaded(var1, reg0)
|
|
|
|
def snap(self):
|
|
cleanup = collections.defaultdict(list)
|
|
cleanup.update({r: list(c) for r, c in self.cleanup.items()})
|
|
return dict(self.vars), cleanup
|
|
|
|
def restore(self, snap):
|
|
self.reset()
|
|
vardict, cleanup = snap
|
|
for var, reg in vardict.items():
|
|
assert reg is not None, f'bad snapshot: {snap}'
|
|
self.loaded(var, reg)
|
|
self.cleanup[reg] = cleanup.get(reg, [])
|
|
|
|
@contextlib.contextmanager
|
|
def borrow(self, howmany):
|
|
regs = [self.take() for i in range(howmany)]
|
|
yield regs
|
|
for reg in regs:
|
|
self.give(reg)
|
|
|
|
|
|
class FunctionSpec:
|
|
def __init__(self, fun_prot):
|
|
self.return_type = fun_prot.children[0]
|
|
self.name = fun_prot.children[1]
|
|
self.param_types = [x.children[0] for x in fun_prot.children[2:]]
|
|
|
|
def __repr__(self):
|
|
params = ', '.join(self.param_types)
|
|
return f'<Function: {self.return_type} {self.name}({params})>'
|
|
|
|
@property
|
|
def type(self):
|
|
return FunType(ret=self.return_type, params=self.param_types)
|
|
|
|
|
|
class Function:
|
|
def __init__(self, fun_prot):
|
|
self.locals = {}
|
|
self.spec = FunctionSpec(fun_prot)
|
|
self.params = [Variable(*x.children) for x in fun_prot.children[2:]]
|
|
self.ret = None
|
|
self.nextstack = 0
|
|
self.topstack = 0
|
|
self.statements = []
|
|
self.regs = RegBank(logger=self.log)
|
|
self.deferred_ops = []
|
|
self.fun_calls = 0
|
|
self.ops = []
|
|
|
|
def log(self, line):
|
|
self.ops.append(lambda: [f'// {line}'])
|
|
|
|
@property
|
|
def stack_usage(self):
|
|
top_usage = max(self.topstack, self.nextstack)
|
|
if self.fun_calls > 0:
|
|
return top_usage + 2
|
|
return top_usage
|
|
|
|
def get_stack(self, size=2):
|
|
stk = self.nextstack
|
|
self.nextstack += size
|
|
return stk
|
|
|
|
@contextlib.contextmanager
|
|
def tempstack(self):
|
|
stk = self.nextstack
|
|
yield
|
|
if self.nextstack > self.topstack:
|
|
self.topstack = self.nextstack
|
|
self.nextstack = stk
|
|
|
|
def param_dict(self):
|
|
return {p.name: p for p in self.params}
|
|
|
|
def __repr__(self):
|
|
return repr(self.spec)
|
|
|
|
def synth(self):
|
|
ops = []
|
|
if self.fun_calls > 0:
|
|
ops += [f'store lr, [sp, -2]']
|
|
if self.stack_usage > 0:
|
|
ops += [f'set r4, {self.stack_usage}',
|
|
f'sub sp, sp, r4']
|
|
for op in self.ops:
|
|
ops += op()
|
|
indented = [f' {x}' if x[-1] == ':' else f' {x}' for x in ops]
|
|
return [f'.global {self.spec.name}',
|
|
f'{self.spec.name}:'] + indented
|
|
|
|
|
|
class Struct:
|
|
def __init__(self, struct_def):
|
|
self.name = struct_def.children[0]
|
|
self.fields = [Variable(*x.children) for x in struct_def.children[1].children]
|
|
|
|
def offset(self, field):
|
|
return 2 * [x.name for x in self.fields].index(field)
|
|
|
|
def field_type(self, field):
|
|
for f in self.fields:
|
|
if f.name == field:
|
|
return f.type
|
|
return None
|
|
|
|
|
|
@dataclass
|
|
class CType:
|
|
volatile: bool = False
|
|
const: bool = False
|
|
size: int = 2
|
|
|
|
@dataclass
|
|
class StructType(CType):
|
|
struct: str = ''
|
|
|
|
@dataclass
|
|
class PointerType(CType):
|
|
pointed: CType = None
|
|
|
|
@dataclass
|
|
class FunType(CType):
|
|
ret: CType = None
|
|
params: [CType] = None
|
|
|
|
@dataclass
|
|
class PodType(CType):
|
|
pod: str = 'int'
|
|
signed = True
|
|
|
|
@dataclass
|
|
class VoidType(CType):
|
|
pass
|
|
|
|
|
|
class CcTransform(lark.visitors.Transformer):
|
|
def _binary_op(litt):
|
|
@lark.v_args(tree=True)
|
|
def _f(self, tree):
|
|
left, right = tree.children
|
|
if left.data == 'literal' and right.data == 'literal':
|
|
tree.data = 'literal'
|
|
tree.children = [litt(left.children[0], right.children[0])]
|
|
return tree
|
|
return _f
|
|
|
|
def field(self, children):
|
|
(field,) = children
|
|
return field
|
|
|
|
def struct_type(self, children):
|
|
(name,) = children
|
|
return StructType(struct=name)
|
|
|
|
def pointer(self, children):
|
|
volat = 'volatile' in children
|
|
pointed = children[-1]
|
|
return PointerType(volatile=volat, pointed=pointed)
|
|
|
|
def funptr_type(self, children):
|
|
ret, *params = children
|
|
return FunType(ret=ret, params=params)
|
|
|
|
def comma_expr(self, children):
|
|
c1, c2 = children
|
|
if c1.data == 'comma_expr':
|
|
c1.children.append(c2)
|
|
return c1
|
|
return lark.Tree('comma_expr', [c1, c2])
|
|
|
|
volatile = lambda *_: 'volatile'
|
|
const = lambda *_: 'const'
|
|
|
|
def type(self, children):
|
|
volat = 'volatile' in children
|
|
const = 'const' in children
|
|
typ = children[-1]
|
|
if isinstance(typ, str):
|
|
if typ == 'void':
|
|
return VoidType()
|
|
size = 1 if typ == 'char' else 2
|
|
return PodType(volatile=volat, const=const, pod=typ, size=size)
|
|
else:
|
|
return typ
|
|
|
|
# operations on literals can be done by the compiler
|
|
add = _binary_op(lambda a, b: a+b)
|
|
sub = _binary_op(lambda a, b: a-b)
|
|
mul = _binary_op(lambda a, b: a*b)
|
|
shl = _binary_op(lambda a, b: a<<b)
|
|
|
|
CHARACTER = lambda _, x: ord(ast.literal_eval(x)[0])
|
|
IDENTIFIER = str
|
|
SIGNED_NUMBER = int
|
|
HEX_LITTERAL = lambda _, x: int(x[2:], 16)
|
|
ESCAPED_STRING = lambda _, x: ast.literal_eval(x)
|
|
INT = int
|
|
|
|
|
|
class AsmOp:
|
|
scratch_need = 0
|
|
|
|
def synth(self, scratches):
|
|
return [f'nop']
|
|
|
|
@property
|
|
def out(self):
|
|
return None
|
|
|
|
|
|
class Reg:
|
|
scratch_need = 0
|
|
|
|
def __init__(self, reg):
|
|
self.out = reg
|
|
|
|
def synth(self, scratches):
|
|
return []
|
|
|
|
|
|
class BinOp(AsmOp):
|
|
scratch_need = 0
|
|
|
|
def __init__(self, fun, ops):
|
|
self.fun = fun
|
|
self.dest, self.left, self.right = ops
|
|
|
|
@property
|
|
def out(self):
|
|
return self.dest
|
|
|
|
|
|
def make_cpu_bin_op(cpu_op):
|
|
class _C(BinOp):
|
|
def synth(self, _):
|
|
return [f'{cpu_op} {self.dest}, {self.left}, {self.right}']
|
|
return _C
|
|
|
|
|
|
AddOp = make_cpu_bin_op('add')
|
|
SubOp = make_cpu_bin_op('sub')
|
|
MulOp = make_cpu_bin_op('mul')
|
|
# no div
|
|
# no mod either
|
|
AndOp = make_cpu_bin_op('and')
|
|
OrOp = make_cpu_bin_op('or')
|
|
XorOp = make_cpu_bin_op('xor')
|
|
ShrOp = make_cpu_bin_op('shr') # 2nd operand needs to be a literal
|
|
|
|
class ShlOp(BinOp):
|
|
scratch_need = 2
|
|
def synth(self, scratches):
|
|
sc0, sc1 = scratches
|
|
return [f'set {sc1}, 1',
|
|
f'or {self.dest}, {self.left}, {self.left}',
|
|
f'sub {sc0}, {self.right}, {sc1}',
|
|
f'beq [pc, 4]',
|
|
f'add {self.dest}, {self.dest}, {self.dest}',
|
|
f'sub {sc0}, {sc0}, {sc1}',
|
|
f'bneq [pc, -8]']
|
|
|
|
|
|
class LtOp(BinOp):
|
|
scratch_need = 1
|
|
def synth(self, scratches):
|
|
sc0 = scratches[0]
|
|
return [f'set {self.dest}, 0',
|
|
f'sub {sc0}, {self.left}, {self.right}',
|
|
f'bneq [pc, 0]',
|
|
f'set {self.dest}, 1']
|
|
|
|
class GtOp(LtOp):
|
|
def __init__(self, fun, ops):
|
|
dest, left, right = ops
|
|
super(GtOp, self).__init__(fun, [dest, right, left])
|
|
|
|
|
|
class UnOp(AsmOp):
|
|
scratch_need = 0
|
|
|
|
def __init__(self, fun, ops):
|
|
self.fun = fun
|
|
self.dest, self.operand = ops
|
|
|
|
@property
|
|
def out(self):
|
|
return self.dest
|
|
|
|
|
|
class Incr(UnOp):
|
|
scratch_need = 1
|
|
def synth(self, scratches):
|
|
sc0 = scratches[0]
|
|
return [f'set {sc0}, 1',
|
|
f'add {self.dest}, {self.operand}, {sc0}',
|
|
f'or {self.operand}, {self.dest}, {self.dest}']
|
|
|
|
class Decr(UnOp):
|
|
scratch_need = 1
|
|
def synth(self, scratches):
|
|
sc0 = scratches[0]
|
|
return [f'set {sc0}, 1',
|
|
f'sub {self.dest}, {self.operand}, {sc0}',
|
|
f'or {self.operand}, {self.dest}, {self.dest}']
|
|
|
|
|
|
class NotOp(UnOp):
|
|
def synth(self, scratches):
|
|
return [f'not {self.dest}, {self.operand}']
|
|
|
|
class BoolNot(UnOp):
|
|
def synth(self, scratches):
|
|
return [f'set {self.dest}, 0',
|
|
f'cmp {self.dest}, {self.operand}',
|
|
f'bneq [pc, 0]',
|
|
f'set {self.dest}, 1']
|
|
|
|
class NeqOp(BinOp):
|
|
def synth(self, scratches):
|
|
return [f'sub {self.dest}, {self.left}, {self.right}']
|
|
|
|
|
|
class FnCall(AsmOp):
|
|
scratch_need = 1
|
|
|
|
def __init__(self, fun, ops):
|
|
self.fun = fun
|
|
self.dest_fn, self.params = ops
|
|
|
|
@property
|
|
def out(self):
|
|
return 'r0'
|
|
|
|
def synth(self, scratches):
|
|
out = []
|
|
sc0 = scratches[0]
|
|
fn = self.dest_fn
|
|
|
|
return out + [f'set {sc0}, 0',
|
|
f'add lr, pc, {sc0}',
|
|
f'or pc, {fn}, {fn}']
|
|
|
|
|
|
class ReturnReg(AsmOp):
|
|
scratch_need = 1
|
|
|
|
def __init__(self, fun, ops):
|
|
self.fun = fun
|
|
(self.ret_reg,) = ops
|
|
|
|
def synth(self, scratches):
|
|
ops = []
|
|
stack_usage = self.fun.stack_usage
|
|
(sc0,) = scratches
|
|
if stack_usage > 0:
|
|
ops += [f'set {sc0}, {stack_usage}',
|
|
f'add sp, sp, {sc0}']
|
|
if self.fun.ret is not None:
|
|
ret = self.ret_reg
|
|
ops += [f'or r0, {ret}, {ret}']
|
|
|
|
if self.fun.fun_calls == 0:
|
|
ops += [f'or pc, lr, lr']
|
|
else:
|
|
ops += [f'load pc, [sp, -2] // return']
|
|
|
|
return ops
|
|
|
|
|
|
class Load(AsmOp):
|
|
scratch_need = 0
|
|
|
|
def __init__(self, fun, ops):
|
|
self.fun = fun
|
|
self.dest, self.var = ops
|
|
fun.log(f'8bit load? {self.var.type} {self.is8bit}')
|
|
|
|
@property
|
|
def is8bit(self):
|
|
if not isinstance(self.var.type, PodType):
|
|
return False
|
|
if self.var.type.pod in ['uint8_t', 'int8_t', 'char']:
|
|
return True
|
|
return False
|
|
|
|
def _maybecast8bit(self, reg):
|
|
if self.is8bit:
|
|
return [f'shr {reg}, {reg}, 8']
|
|
return []
|
|
|
|
@property
|
|
def out(self):
|
|
return self.dest
|
|
|
|
def synth(self, scratches):
|
|
reg = self.dest
|
|
if self.var.name in self.fun.locals:
|
|
src = self.var.stackaddr
|
|
return [f'load {reg}, [sp, {src}]'] # no 8bit cast to/from stack
|
|
elif self.var.addr_reg is not None:
|
|
return [f'load {reg}, [{self.var.addr_reg}]'] + self._maybecast8bit(reg)
|
|
else:
|
|
return [f'set {reg}, {self.var.name}',
|
|
f'nop // in case we load a far global',
|
|
f'load {reg}, [{reg}]'] # unsure if we need a cast here
|
|
|
|
|
|
class Push(AsmOp):
|
|
def __init__(self, reg, stackaddr):
|
|
self.reg = reg
|
|
self.stackaddr = stackaddr
|
|
|
|
def synth(self, scratches):
|
|
return [f'store {self.reg}, [sp, {self.stackaddr}]']
|
|
|
|
|
|
class Pop(AsmOp):
|
|
def __init__(self, reg, stackaddr):
|
|
self.reg = reg
|
|
self.stackaddr = stackaddr
|
|
|
|
@property
|
|
def out(self):
|
|
return self.reg
|
|
|
|
def synth(self, scratches):
|
|
return [f'load {self.reg}, [sp, {self.stackaddr}]']
|
|
|
|
|
|
class Store(AsmOp):
|
|
scratch_need = 1
|
|
|
|
def __init__(self, fun, ops):
|
|
self.fun = fun
|
|
self.src, self.var = ops
|
|
|
|
def synth(self, scratches):
|
|
(sc,) = scratches
|
|
reg = self.src
|
|
if self.var.name in self.fun.locals:
|
|
dst = self.var.stackaddr
|
|
self.fun.log(f'storing {self.var}({reg}) to [sp, {dst}]')
|
|
return [f'store {reg}, [sp, {dst}]']
|
|
elif self.var.addr_reg is not None:
|
|
return [f'store {reg}, [{self.var.addr_reg}]']
|
|
return [f'set {sc}, {self.var.name}',
|
|
f'nop // you know, in case blah',
|
|
f'store {reg}, [{sc}]']
|
|
|
|
|
|
class Assign(AsmOp):
|
|
scratch_need = 0
|
|
|
|
def __init__(self, fun, ops):
|
|
self.fun = fun
|
|
self.src, self.var = ops
|
|
|
|
@property
|
|
def out(self):
|
|
return self.var
|
|
|
|
def synth(self, scratches):
|
|
return [f'or {self.var}, {self.src}, {self.src}']
|
|
|
|
|
|
class SetAddr(AsmOp):
|
|
scratch_need = 0
|
|
|
|
def __init__(self, fun, ops):
|
|
self.dest, self.ident = ops
|
|
|
|
@property
|
|
def out(self):
|
|
return self.dest
|
|
|
|
def synth(self, scratches):
|
|
reg = self.dest
|
|
return [f'set {reg}, {self.ident}',
|
|
f'nop // placeholder for a long address']
|
|
|
|
|
|
class Set16Imm(AsmOp):
|
|
scratch_need = 0
|
|
|
|
def __init__(self, fun, ops):
|
|
self.dest, self.imm16 = ops
|
|
|
|
@property
|
|
def out(self):
|
|
return self.dest
|
|
|
|
def synth(self, scratches):
|
|
reg = self.dest
|
|
hi = (self.imm16 >> 8) & 0xff
|
|
lo = (self.imm16 >> 0) & 0xff
|
|
if hi != 0:
|
|
return [f'set {reg}, {lo}',
|
|
f'seth {reg}, {hi}']
|
|
else:
|
|
return [f'set {reg}, {lo}']
|
|
|
|
class Move(AsmOp):
|
|
scratch_need = 0
|
|
|
|
def __init__(self, dst, src):
|
|
self.dst = dst
|
|
self.src = src
|
|
|
|
def synth(self, scratches):
|
|
return [f'or {self.dst}, {self.src}, {self.src}']
|
|
|
|
class Swap(AsmOp):
|
|
scratch_need = 1
|
|
|
|
def __init__(self, a0, a1):
|
|
self.a0 = a0
|
|
self.a1 = a1
|
|
|
|
def synth(self, scratches):
|
|
(sc0,) = scratches
|
|
return [f'or {sc0}, {self.a0}, {self.a0}',
|
|
f'or {self.a0}, {self.a1}, {self.a1}',
|
|
f'or {self.a1}, {sc0}, {sc0}']
|
|
|
|
|
|
class IfOp(AsmOp):
|
|
scratch_need = 1
|
|
|
|
def __init__(self, fun, op):
|
|
self.fun = fun
|
|
self.cond, mark, self.has_else = op
|
|
|
|
self.then_mark = f'_then_{mark}'
|
|
self.else_mark = f'_else_{mark}'
|
|
self.endif_mark = f'_endif_{mark}'
|
|
|
|
def synth(self, scratches):
|
|
sc0 = scratches[0]
|
|
if self.has_else:
|
|
return [f'set {sc0}, 0',
|
|
f'cmp {sc0}, {self.cond}', # flag if cond == 0
|
|
f'beq {self.else_mark}']
|
|
else:
|
|
return [f'set {sc0}, 0',
|
|
f'cmp {sc0}, {self.cond}',
|
|
f'beq {self.endif_mark}']
|
|
|
|
def synth_else(self):
|
|
return [f'cmp r0, r0', # trick because beq is better than "or pc, ."
|
|
f'beq {self.endif_mark}',
|
|
f'{self.else_mark}:']
|
|
|
|
def synth_endif(self):
|
|
return [f'{self.endif_mark}:']
|
|
|
|
|
|
class IfEq(IfOp):
|
|
scratch_need = 0
|
|
|
|
def __init__(self, a, b, mark, has_else):
|
|
self.a = a
|
|
self.b = b
|
|
self.has_else = has_else
|
|
|
|
self.then_mark = f'_then_{mark}'
|
|
self.else_mark = f'_else_{mark}'
|
|
self.endif_mark = f'_endif_{mark}'
|
|
|
|
def synth(self, scratches):
|
|
if self.has_else:
|
|
return [f'cmp {self.a}, {self.b}',
|
|
f'bneq {self.else_mark}']
|
|
else:
|
|
return [f'cmp {self.a}, {self.b}',
|
|
f'bneq {self.endif_mark}']
|
|
|
|
|
|
class WhileOp(AsmOp):
|
|
scratch_need = 1
|
|
|
|
@staticmethod
|
|
def synth_loop(mark):
|
|
loop_mark = f'_loop_{mark}'
|
|
return [f'{loop_mark}:']
|
|
|
|
def __init__(self, cond, mark):
|
|
self.cond = cond
|
|
self.loop_mark = f'_loop_{mark}'
|
|
self.endwhile_mark = f'_endwhile_{mark}'
|
|
|
|
def synth(self, scratches):
|
|
sc0 = scratches[0]
|
|
return [f'set {sc0}, 0',
|
|
f'cmp {sc0}, {self.cond}',
|
|
f'beq {self.endwhile_mark}']
|
|
|
|
def synth_endwhile(self):
|
|
return [f'cmp r0, r0',
|
|
f'beq {self.loop_mark}',
|
|
f'{self.endwhile_mark}:']
|
|
|
|
|
|
class Delayed(AsmOp):
|
|
def __init__(self, out_cb):
|
|
self.out_cb = out_cb
|
|
|
|
@property
|
|
def out(self):
|
|
return self.out_cb()
|
|
|
|
def synth(self):
|
|
return []
|
|
|
|
|
|
def litt_type(val):
|
|
if isinstance(val, str):
|
|
return PointerType(pointed=PodType(pod='char', size=1, const=True))
|
|
elif isinstance(val, float):
|
|
return PodType(pod='float', const=True)
|
|
else:
|
|
return PodType(pod='int', const=True)
|
|
|
|
|
|
def return_type(type):
|
|
return type.ret
|
|
|
|
|
|
def deref_type(type):
|
|
return type.pointed
|
|
|
|
|
|
class CcInterp(lark.visitors.Interpreter):
|
|
def __init__(self):
|
|
self.global_scope = Scope()
|
|
self.cur_scope = self.global_scope
|
|
self.cur_fun = None
|
|
self.funs = []
|
|
self.next_reg = 0
|
|
self.next_marker = 0
|
|
self.strings = {}
|
|
self.next_string_token = 0
|
|
self.rodata = {}
|
|
|
|
def _lookup_symbol(self, s):
|
|
scope = self.cur_scope
|
|
while scope is not None:
|
|
if s in scope.symbols:
|
|
return scope.symbols[s]
|
|
scope = scope.parent
|
|
return None
|
|
|
|
def _get_reg(self):
|
|
return self.cur_fun.regs.take()
|
|
|
|
def _get_marker(self):
|
|
mark = self.next_marker
|
|
self.next_marker += 1
|
|
return mark
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def _nosynth(self):
|
|
old = self._synth
|
|
self._synth = lambda *_: None
|
|
yield
|
|
self._synth = old
|
|
|
|
def _synth(self, op):
|
|
with self.cur_fun.regs.borrow(op.scratch_need) as scratches:
|
|
self._log(f'{op.__class__.__name__}')
|
|
self.cur_fun.ops.append(lambda: op.synth(scratches))
|
|
|
|
def _load(self, ident, reg=None):
|
|
s = self._lookup_symbol(ident)
|
|
assert s is not None, f'unknown identifier {ident}'
|
|
if isinstance(s, FunctionSpec) or ident in self.global_scope.symbols:
|
|
reg = self.cur_fun.regs.take(reg=reg, orwhatever=True)
|
|
return SetAddr(self.cur_fun, [reg, s.name])
|
|
else:
|
|
if s.type.volatile:
|
|
self._log(f'loading volatile {s}')
|
|
return Load(self.cur_fun, [reg, s])
|
|
reg, created = self.cur_fun.regs.load(s)
|
|
if created:
|
|
return Load(self.cur_fun, [reg, s])
|
|
else:
|
|
self._log(f'{s} was already in {reg}')
|
|
return Reg(reg)
|
|
|
|
def identifier(self, tree):
|
|
# TODO: not actually load the value until it's used in an expression
|
|
# could have the op.out() function have a side effect that does that
|
|
# if it's an assignment, we need to make a Variable with the proper
|
|
# address and assign the register to it.
|
|
# If it's volatile, we need to flush it.
|
|
def delayed_load():
|
|
self._log(f'delay-loading {tree.children[0]}')
|
|
reg = getattr(tree, 'request_out', None)
|
|
op = self._load(tree.children[0], reg=reg)
|
|
self._synth(op)
|
|
return op.out
|
|
|
|
tree.op = Delayed(delayed_load)
|
|
tree.var = self._lookup_symbol(tree.children[0])
|
|
assert tree.var is not None, f'undefined identifier: {tree.children[0]}'
|
|
tree.type = tree.var.type
|
|
|
|
def _make_string(self, s):
|
|
nexttok = self.next_string_token
|
|
self.next_string_token += 1
|
|
token = f'_str{nexttok}'
|
|
self.strings[token] = s
|
|
self.global_scope.symbols[token] = Variable(litt_type(s), token)
|
|
return token
|
|
|
|
def literal(self, tree):
|
|
imm = tree.children[0]
|
|
if isinstance(imm, str):
|
|
tok = self._make_string(imm)
|
|
tree.children = [tok]
|
|
return self.identifier(tree)
|
|
def delayed():
|
|
if hasattr(tree, 'request_out'):
|
|
reg = self.cur_fun.regs.take(reg=tree.request_out, orwhatever=True)
|
|
else:
|
|
reg = self.cur_fun.regs.take()
|
|
assert reg is not None, f'weird: {self.cur_fun.regs}'
|
|
op = Set16Imm(self.cur_fun, [reg, imm])
|
|
self._synth(op)
|
|
return op.out
|
|
|
|
tree.op = Delayed(delayed)
|
|
tree.type = litt_type(tree.children[0])
|
|
|
|
def array_item(self, tree):
|
|
# transform blarg[foo] into *(blarg + foo) because reasons
|
|
# TODO: bring this over to the main parser, we need to know the type
|
|
# of blarg in order to compute the actual offset
|
|
s = self._lookup_symbol(tree.children[0].children[0])
|
|
if s.type.pointed.size == 1:
|
|
# easy deref + add
|
|
tree.children = [lark.Tree('add', tree.children)]
|
|
return self.dereference(tree)
|
|
|
|
# everything else is 16 bit, do something like:
|
|
# array[index] === *(array + (index << 1))
|
|
add1 = lark.Tree('shl', [tree.children[1], lark.Tree('literal', [1])])
|
|
add2 = lark.Tree('add', [tree.children[0], add1])
|
|
tree.children = [add2]
|
|
return self.dereference(tree)
|
|
|
|
def _assign(self, left, right):
|
|
self._log(f'assigning {left} = {right}')
|
|
self.cur_fun.regs.assign(left, right)
|
|
op = Store(self.cur_fun, [right, left])
|
|
self._synth(op)
|
|
return op.out
|
|
|
|
def assignment(self, tree):
|
|
self.visit_children(tree)
|
|
val = tree.children[1].op.out
|
|
assert val is not None, f'no output!!! {tree.pretty()}'
|
|
|
|
# left hand side is an lvalue, retrieve it
|
|
var = tree.children[0].var
|
|
tree.op = self._assign(var, val)
|
|
|
|
def global_var(self, tree):
|
|
self.visit_children(tree)
|
|
var = Variable.from_def(tree)
|
|
self.global_scope.symbols[var.name] = var
|
|
val = 0
|
|
if len(tree.children) > 2:
|
|
val = tree.children[2].children[0].value
|
|
|
|
def fun_decl(self, tree):
|
|
fun = FunctionSpec(tree.children[0])
|
|
self.cur_scope.symbols[fun.name] = fun
|
|
|
|
def _reg_shuffle(self, src, dst):
|
|
def swap(old, new):
|
|
if old == new:
|
|
return
|
|
oldpos = src.index(old)
|
|
try:
|
|
newpos = src.index(new)
|
|
except ValueError:
|
|
src[oldpos] = new
|
|
else:
|
|
src[newpos], src[oldpos] = src[oldpos], src[newpos]
|
|
self._synth(Swap(old, new))
|
|
|
|
for i, r in enumerate(dst):
|
|
if r not in src:
|
|
#self.cur_fun.regs.take(r) # precious!
|
|
self._synth(Move(r, src[i]))
|
|
else:
|
|
swap(r, src[i])
|
|
|
|
|
|
def _prep_fun_call(self, fn_reg, params):
|
|
"""Move all params to r0-rn."""
|
|
target_regs = [f'r{i}' for i in range(len(params) + 1)]
|
|
self._reg_shuffle(params + [fn_reg], target_regs)
|
|
return target_regs[-1]
|
|
|
|
@contextlib.contextmanager
|
|
def _push(self, dontpush=()):
|
|
pushed = []
|
|
self.cur_fun.regs.evict_all()
|
|
with self.cur_fun.tempstack():
|
|
for reg in allregs():
|
|
if reg not in self.cur_fun.regs.available and reg not in dontpush:
|
|
self._log(f'reg in use: {reg}')
|
|
stk = self.cur_fun.get_stack()
|
|
pushed.append((reg, stk))
|
|
self._synth(Push(reg, stk))
|
|
self.cur_fun.regs.give(reg)
|
|
yield pushed
|
|
|
|
def fun_call(self, tree):
|
|
self.cur_fun.fun_calls += 1
|
|
if len(tree.children) == 1:
|
|
param_children = []
|
|
elif tree.children[1].data == 'comma_expr':
|
|
param_children = tree.children[1].children
|
|
else:
|
|
param_children = [tree.children[1]]
|
|
|
|
|
|
if True:
|
|
# pre-allocate output registers
|
|
for i, child in enumerate(param_children):
|
|
self._log(f'requesting r{i} for {child}')
|
|
child.request_out = f'r{i}'
|
|
self._log(f'requesting r{len(param_children)} for {tree.children[0]}')
|
|
tree.children[0].request_out = f'r{len(param_children)}'
|
|
self.visit_children(tree)
|
|
fn_reg = tree.children[0].op.out
|
|
param_regs = [c.op.out for c in param_children]
|
|
self._log(f'calling {tree.children[0].children[0]}({param_regs})')
|
|
|
|
with self._push(dontpush=param_regs + [fn_reg]) as pushed:
|
|
|
|
self._flush_deferred() # side effects
|
|
fn_reg = self._prep_fun_call(fn_reg, param_regs)
|
|
self.cur_fun.regs.reset()
|
|
self.cur_fun.regs.take(fn_reg)
|
|
for reg in (f'r{i}' for i in range(len(param_regs))):
|
|
self.cur_fun.regs.take(reg)
|
|
|
|
tree.op = FnCall(self.cur_fun, [fn_reg, param_regs])
|
|
self._synth(tree.op)
|
|
|
|
self.cur_fun.regs.reset()
|
|
|
|
pops = []
|
|
for reg, stk in pushed:
|
|
self.cur_fun.regs.take(reg)
|
|
pops.append(Pop(reg, stk))
|
|
|
|
ret = 'r0'
|
|
if hasattr(tree, 'request_out'):
|
|
ret = tree.request_out
|
|
self._synth(Move(ret, 'r0'))
|
|
|
|
nret = self.cur_fun.regs.take(ret, orwhatever=True)
|
|
if nret != ret:
|
|
self._synth(Move(nret, ret))
|
|
tree.op = type('blah', (), {'out': nret})
|
|
|
|
for op in pops:
|
|
self._synth(op)
|
|
|
|
tree.type = return_type(tree.children[0].type)
|
|
|
|
def _flush_deferred(self):
|
|
if self.cur_fun.deferred_ops:
|
|
self._log(f'deferred logic: {len(self.cur_fun.deferred_ops)}')
|
|
for op in self.cur_fun.deferred_ops:
|
|
self._synth(op)
|
|
self.cur_fun.deferred_ops = []
|
|
|
|
def statement(self, tree):
|
|
self.visit_children(tree)
|
|
self._flush_deferred()
|
|
self.cur_fun.regs.drop_temps()
|
|
|
|
iter_expression = statement
|
|
|
|
def if_stat(self, tree):
|
|
mark = self._get_marker()
|
|
has_else = len(tree.children) > 2
|
|
# optimization!!!!
|
|
if tree.children[0].data == 'eq':
|
|
self.visit_children(tree.children[0])
|
|
a, b = (c.op.out for c in tree.children[0].children)
|
|
op = IfEq(a, b, mark, has_else)
|
|
else:
|
|
self.visit(tree.children[0])
|
|
op = IfOp(self.cur_fun, [tree.children[0].op.out, mark, has_else])
|
|
self._synth(op)
|
|
self.cur_fun.regs.drop_temps()
|
|
begin_vars = self.cur_fun.regs.snap()
|
|
valid_vars_set = set(begin_vars[0].items())
|
|
self.visit(tree.children[1])
|
|
valid_vars_set &= set(self.cur_fun.regs.snap()[0].items())
|
|
if has_else:
|
|
self.cur_fun.regs.restore(begin_vars)
|
|
self.cur_fun.ops.append(op.synth_else)
|
|
self.visit(tree.children[2])
|
|
valid_vars_set &= set(self.cur_fun.regs.snap()[0].items())
|
|
valid_vars = dict(valid_vars_set)
|
|
valid_snap = (valid_vars, {r: begin_vars[1][r] for r in valid_vars.values()})
|
|
self.cur_fun.regs.restore(valid_snap)
|
|
self.cur_fun.ops.append(op.synth_endif)
|
|
|
|
def _restore_vars(self, begin_vars):
|
|
curvars = self.cur_fun.regs.vars
|
|
|
|
# 0. do the loop shuffle
|
|
shuffles = {begin_vars[v]: r for v, r in curvars.items() if v in begin_vars}
|
|
dst, src = tuple(zip(*shuffles.items())) or ([], [])
|
|
self._reg_shuffle(src, dst)
|
|
|
|
# 1. load the rest
|
|
for v, r in begin_vars.items():
|
|
if v in curvars:
|
|
continue
|
|
self._log(f'loading missing var {v} into {r}')
|
|
self._synth(Load(self.cur_fun, [r, v]))
|
|
|
|
def while_stat(self, tree):
|
|
mark = self._get_marker()
|
|
self.cur_fun.ops.append(lambda: WhileOp.synth_loop(mark))
|
|
begin_vars = dict(self.cur_fun.regs.vars)
|
|
self.visit(tree.children[0])
|
|
postcond = self.cur_fun.regs.snap()
|
|
op = WhileOp(tree.children[0].op.out, mark)
|
|
self._synth(op)
|
|
self.cur_fun.regs.drop_temps()
|
|
self.visit(tree.children[1])
|
|
self._restore_vars(begin_vars)
|
|
self.cur_fun.ops.append(op.synth_endwhile)
|
|
self.cur_fun.regs.restore(postcond)
|
|
|
|
def for_stat(self, tree):
|
|
mark = self._get_marker()
|
|
self.visit(tree.children[0]) # initialization
|
|
self.cur_fun.ops.append(lambda: WhileOp.synth_loop(mark))
|
|
begin_vars = dict(self.cur_fun.regs.vars)
|
|
self.visit(tree.children[1])
|
|
postcond = self.cur_fun.regs.snap()
|
|
op = WhileOp(tree.children[1].op.out, mark)
|
|
self._synth(op)
|
|
self.cur_fun.regs.drop_temps()
|
|
self.visit(tree.children[3])
|
|
self.visit(tree.children[2]) # 3rd statement
|
|
self._restore_vars(begin_vars)
|
|
self.cur_fun.ops.append(op.synth_endwhile)
|
|
self.cur_fun.regs.restore(postcond)
|
|
|
|
def _unary_op(op):
|
|
def _f(self, tree):
|
|
self.visit_children(tree)
|
|
operand = tree.children[0].op.out
|
|
reg = self.cur_fun.regs.take()
|
|
tree.op = op(self.cur_fun, [reg, operand])
|
|
self._synth(tree.op)
|
|
self.cur_fun.regs.give(operand)
|
|
return _f
|
|
|
|
def _deref(self, tree):
|
|
reg = tree.children[0].op.out
|
|
var = Variable.from_dereference(reg, tree.children[0])
|
|
self._log(f'making var {var} from derefing reg {reg}')
|
|
tree.var = var
|
|
def delayed_load():
|
|
self._log(f'delay-loading {tree.children[0]}')
|
|
op = Load(self.cur_fun, [reg, var])
|
|
self._synth(op)
|
|
return op.out
|
|
tree.op = Delayed(delayed_load)
|
|
tree.type = var.type
|
|
|
|
def dereference(self, tree):
|
|
self.visit_children(tree)
|
|
self._deref(tree)
|
|
|
|
def pointer_access(self, tree):
|
|
with self._nosynth():
|
|
self.visit_children(tree)
|
|
ch_strct, ch_field = tree.children
|
|
type = ch_strct.type.pointed
|
|
strct = self.global_scope.structs[type.struct]
|
|
offs = strct.offset(ch_field)
|
|
if offs > 0:
|
|
load_offs = lark.Tree('literal', [offs])
|
|
addop = lark.Tree('add', [tree.children[0], load_offs])
|
|
self.visit(addop)
|
|
addop.type = PointerType(pointed=strct.field_type(ch_field))
|
|
tree.children = [addop]
|
|
else:
|
|
tree.children[0].type = PointerType(pointed=strct.field_type(ch_field))
|
|
tree.children = [tree.children[0]]
|
|
self.visit_children(tree)
|
|
self._deref(tree)
|
|
|
|
def post_increment(self, tree):
|
|
self.visit_children(tree)
|
|
tree.op = Reg(tree.children[0].op.out)
|
|
var = tree.children[0].var
|
|
reg = tree.op.out
|
|
self.cur_fun.deferred_ops.append(Incr(self.cur_fun, [reg, reg]))
|
|
self.cur_fun.deferred_ops.append(Store(self.cur_fun, [reg, var]))
|
|
tree.type = var.type
|
|
|
|
def post_decrement(self, tree):
|
|
self.visit_children(tree)
|
|
tree.op = Reg(tree.children[0].op.out)
|
|
var = tree.children[0].var
|
|
reg = tree.op.out
|
|
self.cur_fun.deferred_ops.append(Decr(self.cur_fun, [reg, reg]))
|
|
self.cur_fun.deferred_ops.append(Store(self.cur_fun, [reg, var]))
|
|
tree.type = var.type
|
|
|
|
def pre_increment(self, tree):
|
|
self.visit_children(tree)
|
|
reg = tree.children[0].op.out
|
|
tree.op = Incr(self.cur_fun, [reg, reg])
|
|
self._synth(tree.op)
|
|
cleanup = lambda reg: self._synth(Store(self.cur_fun, [reg, var]))
|
|
self.cur_fun.regs.cleanup[reg].append(cleanup)
|
|
|
|
bool_not = _unary_op(BoolNot)
|
|
|
|
def _binary_op(op):
|
|
def _f(self, tree):
|
|
self.visit_children(tree)
|
|
left, right = (x.op.out for x in tree.children)
|
|
dest = self.cur_fun.regs.take()
|
|
tree.op = op(self.cur_fun, [dest, left, right])
|
|
self._synth(tree.op)
|
|
self.cur_fun.regs.give(left)
|
|
self.cur_fun.regs.give(right)
|
|
tree.type = tree.children[0].type # because uhm reasons
|
|
return _f
|
|
|
|
def _combo(uop, bop):
|
|
def _f(self, tree):
|
|
ftree = lark.Tree(bop, tree.children)
|
|
tree.children = [ftree]
|
|
uop.__get__(self)(tree)
|
|
return _f
|
|
|
|
shl = _binary_op(ShlOp)
|
|
add = _binary_op(AddOp)
|
|
sub = _binary_op(SubOp)
|
|
mul = _binary_op(MulOp)
|
|
_and = _binary_op(AndOp)
|
|
_or = _binary_op(OrOp)
|
|
# ...
|
|
gt = _binary_op(GtOp)
|
|
lt = _binary_op(LtOp)
|
|
neq = _binary_op(NeqOp)
|
|
eq = _combo(bool_not, 'neq')
|
|
|
|
def shr(self, tree):
|
|
self.visit(tree.children[0])
|
|
left = tree.children[0].op.out
|
|
assert tree.children[1].data == 'literal'
|
|
right = tree.children[1].children[0]
|
|
dest = self.cur_fun.regs.take()
|
|
tree.op = ShrOp(self.cur_fun, [dest, left, right])
|
|
self._synth(tree.op)
|
|
self.cur_fun.regs.give(left)
|
|
tree.type = tree.children[0].type # because uhm reasons
|
|
|
|
def _assign(self, left, right):
|
|
self._log(f'assigning {left} = {right}')
|
|
self.cur_fun.regs.assign(left, right)
|
|
op = Store(self.cur_fun, [right, left])
|
|
self._synth(op)
|
|
return op.out
|
|
|
|
|
|
def _assign_op(op):
|
|
def f(self, tree):
|
|
opnode = lark.Tree(op, tree.children)
|
|
self.visit(opnode)
|
|
val = opnode.op.out
|
|
# left hand side is an lvalue, retrieve it
|
|
var = tree.children[0].var
|
|
tree.op = self._assign(var, val)
|
|
return f
|
|
|
|
or_ass = _assign_op('_or')
|
|
add_ass = _assign_op('add')
|
|
|
|
def _forward_op(self, tree):
|
|
self.visit_children(tree)
|
|
tree.op = tree.children[0].op
|
|
|
|
def cast(self, tree):
|
|
if hasattr(tree, 'request_out'):
|
|
tree.children[1].request_out = tree.request_out
|
|
self.visit_children(tree)
|
|
tree.op = tree.children[1].op
|
|
tree.type = tree.children[0]
|
|
|
|
def _log(self, line):
|
|
self.cur_fun.log(line)
|
|
|
|
def local_var(self, tree):
|
|
self.visit_children(tree)
|
|
assert self.cur_fun is not None
|
|
assert self.cur_scope is not None
|
|
var = Variable.from_def(tree)
|
|
var.stackaddr = self.cur_fun.get_stack() # will have to invert
|
|
self.cur_scope.symbols[var.name] = var
|
|
self.cur_fun.locals[var.name] = var
|
|
if len(tree.children) > 2:
|
|
initval = tree.children[2].op.out
|
|
cleanup = lambda reg: self._synth(Store(self.cur_fun, [reg, var]))
|
|
self.cur_fun.regs.assign(var, initval, cleanup=cleanup)
|
|
self._log(f'assigning {var} = {initval}')
|
|
|
|
def local_array(self, tree):
|
|
self.visit_children(tree)
|
|
assert self.cur_fun is not None
|
|
assert self.cur_scope is not None
|
|
var = Variable.from_def(tree)
|
|
if var.type.const:
|
|
# storing in rodata
|
|
assert len(tree.children) > 3
|
|
tok = self.next_string_token
|
|
self.next_string_token += 1
|
|
tok = f'_dat{tok}'
|
|
assert len(tree.children[3].children) > 0
|
|
fields =[c.children[0] for c in tree.children[3].children]
|
|
if tree.children[2].data == 'empty_array':
|
|
fieldcount = len(fields)
|
|
else:
|
|
fieldcount = tree.children[2].children[0]
|
|
if len(fields) < fieldcount:
|
|
fields += [0] * (fieldcount - len(fields))
|
|
name = tree.children[1]
|
|
self.rodata[tok] = (tree.children[0], fields)
|
|
var = Variable(PointerType(pointed=litt_type(fields[0])), tok)
|
|
self.global_scope.symbols[name] = var
|
|
|
|
def fun_def(self, tree):
|
|
prot, body = tree.children
|
|
fun = Function(prot)
|
|
assert self.cur_fun is None
|
|
self.cur_fun = fun
|
|
|
|
self.cur_scope.symbols[fun.spec.name] = fun.spec
|
|
|
|
params = fun.param_dict()
|
|
|
|
def getcleanup(var):
|
|
def cl(reg):
|
|
self._log(f'cleanup for {var} in {reg}')
|
|
self._synth(Store(self.cur_fun, [reg, var]))
|
|
return cl
|
|
|
|
for i, param in enumerate(fun.params):
|
|
fun.locals[param.name] = param
|
|
param.stackaddr = fun.get_stack()
|
|
self._log(f'param [sp, {param.stackaddr}]: {param.name} in r{i}')
|
|
cleanup = getcleanup(param)
|
|
fun.regs.loaded(param, f'r{i}', cleanup=cleanup)
|
|
|
|
fun_scope = Scope()
|
|
fun_scope.parent = self.cur_scope
|
|
fun_scope.symbols.update(params)
|
|
|
|
body.scope = fun_scope
|
|
self.visit_children(tree)
|
|
|
|
if fun.ret is None:
|
|
if fun.spec.name == 'main':
|
|
self._synth(Set16Imm(fun, ['r0', 0]))
|
|
self._synth(ReturnReg(fun, ['r0']))
|
|
elif fun.spec.return_type == VoidType():
|
|
self._synth(ReturnReg(fun, ['r0']))
|
|
else:
|
|
assert fun.ret is not None
|
|
self.cur_fun = None
|
|
self.funs.append(fun)
|
|
|
|
def body(self, tree):
|
|
bscope = getattr(tree, 'scope', Scope())
|
|
bscope.parent = self.cur_scope
|
|
self.cur_scope = bscope
|
|
self.visit_children(tree)
|
|
self.cur_scope = bscope.parent
|
|
|
|
def return_stat(self, tree):
|
|
assert self.cur_fun is not None
|
|
self.cur_fun.ret = True
|
|
self.visit_children(tree)
|
|
expr_reg = tree.children[0].op.out
|
|
tree.op = ReturnReg(self.cur_fun, [expr_reg])
|
|
self._synth(tree.op)
|
|
|
|
def struct_def(self, tree):
|
|
self.visit_children(tree)
|
|
strct = Struct(tree)
|
|
self.cur_scope.structs[strct.name] = strct
|
|
|
|
preamble = [f'_start:',
|
|
f'xor r0, r0, r0',
|
|
f'xor r1, r1, r1',
|
|
f'set sp, 0',
|
|
f'seth sp, {0x11}', # 256 bytes of stack ought to be enough
|
|
f'set r2, main',
|
|
f'set r3, 0',
|
|
f'add lr, pc, r3',
|
|
f'or pc, r2, r2',
|
|
f'cmp r0, r0',
|
|
f'beq [pc, -4] // loop forever',
|
|
]
|
|
|
|
def filter_dupes(ops):
|
|
dupe_re = re.compile(r'or (r\d+), \1, \1')
|
|
for op in ops:
|
|
if dupe_re.search(op):
|
|
continue
|
|
yield op
|
|
|
|
def parse_tree(tree, debug=False):
|
|
tr = CcTransform()
|
|
tree = tr.transform(tree)
|
|
|
|
if debug:
|
|
print(tree.pretty())
|
|
|
|
inte = CcInterp()
|
|
inte.visit(tree)
|
|
|
|
out = []
|
|
|
|
for fun in inte.funs:
|
|
out += fun.synth()
|
|
out.append('')
|
|
for sym, dat in inte.strings.items():
|
|
out += [f'.global {sym}',
|
|
f'{sym}:']
|
|
dat += '\0'
|
|
if len(dat) % 2 != 0:
|
|
dat += '\0'
|
|
dat = dat.encode()
|
|
nwords = len(dat) // 2
|
|
out += [f'.word 0x{d:04x}' for d in struct.unpack(f'>{nwords}H', dat)]
|
|
out.append('')
|
|
for sym, (type, fields) in inte.rodata.items():
|
|
out += [f'.global {sym}',
|
|
f'{sym}:']
|
|
out += [f'.word 0x{d:04x}' for d in fields]
|
|
out.append('')
|
|
|
|
return '\n'.join(filter_dupes(out))
|
|
|
|
|
|
def larkparse(f, debug=False):
|
|
with open(GRAMMAR_FILE) as g:
|
|
asparser = lark.Lark(g.read(), maybe_placeholders=False)
|
|
data = f.read()
|
|
if isinstance(data, bytes):
|
|
data = data.decode()
|
|
tree = asparser.parse(data)
|
|
return parse_tree(tree, debug=debug)
|
|
|
|
|
|
def parse_args():
|
|
parser = argparse.ArgumentParser(description='Compile.')
|
|
parser.add_argument('--debug', action='store_true',
|
|
help='print the AST')
|
|
parser.add_argument('--assembly', '-S', action='store_true',
|
|
help='output assembly')
|
|
parser.add_argument('--compile', '-c', action='store_true',
|
|
help='compile a single file')
|
|
parser.add_argument('input', type=argparse.FileType('r'),
|
|
default=sys.stdin, help='input file (default: stdin)')
|
|
parser.add_argument('--output', '-o', type=argparse.FileType('wb'),
|
|
default=sys.stdout.buffer, help='output file')
|
|
parser.add_argument('-I', dest='include_dirs', action='append',
|
|
default=[], help='include dirs')
|
|
return parser.parse_args()
|
|
|
|
|
|
def preprocess(fin, include_dirs):
|
|
cmd = list(CPP) + [f'-I{x}' for x in include_dirs]
|
|
p = subprocess.Popen(cmd, stdin=fin, stdout=subprocess.PIPE)
|
|
out, _ = p.communicate()
|
|
if p.returncode != 0:
|
|
raise RuntimeError(f'preprocessor error')
|
|
return io.StringIO(out.decode())
|
|
|
|
|
|
def assemble(text, fout):
|
|
fin = io.StringIO(text)
|
|
asmod.write_obj(fout, *asmod.larkparse(fin))
|
|
|
|
|
|
def main():
|
|
args = parse_args()
|
|
|
|
assy = larkparse(preprocess(args.input, args.include_dirs), debug=args.debug)
|
|
if args.assembly:
|
|
args.output.write(assy.encode() + b'\n')
|
|
else:
|
|
assemble(assy, args.output)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|