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x86_ast.py
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x86_ast.py
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from __future__ import annotations
import ast
from dataclasses import dataclass
from typing import Iterable
from utils import dedent, indent, indent_stmt, label_name
@dataclass
class X86Program:
body: dict[str, list[instr]] | list[instr]
def __str__(self):
result = ''
if isinstance(self.body, dict):
for (l,ss) in self.body.items():
if l == label_name('main'):
result += '\t.globl ' + label_name('main') + '\n'
result += '\t.align 16\n'
result += l + ':\n'
indent()
result += ''.join([str(s) for s in ss]) + '\n'
dedent()
else:
result += '\t.globl ' + label_name('main') + '\n' + \
label_name('main') + ':\n'
indent()
result += ''.join([str(s) for s in self.body])
dedent()
result += '\n'
return result
@dataclass
class X86ProgramDefs:
defs: list[ast.FunctionDef]
def __str__(self):
return "\n".join([str(d) for d in self.defs])
class instr: ...
class arg: ...
class location(arg): ...
@dataclass(frozen=True, eq=False)
class Instr(instr):
instr: str
args: tuple[arg, ...]
def __init__(self, name: str, args: Iterable[arg]):
# https://docs.python.org/3/library/dataclasses.html#frozen-instances
object.__setattr__(self, 'instr', name)
object.__setattr__(self, 'args', tuple(args))
def source(self):
return self.args[0]
def target(self):
return self.args[-1]
def __str__(self):
return indent_stmt() + self.instr + ' ' + ', '.join(str(a) for a in self.args) + '\n'
@dataclass(frozen=True, eq=False)
class Callq(instr):
func: str
num_args: int
def __str__(self):
return indent_stmt() + 'callq' + ' ' + self.func + '\n'
@dataclass(frozen=True, eq=False)
class IndirectCallq(instr):
func: arg
num_args: int
def __str__(self):
return indent_stmt() + 'callq' + ' *' + str(self.func) + '\n'
@dataclass(frozen=True, eq=False)
class JumpIf(instr):
cc: str
label: str
def __str__(self):
return indent_stmt() + 'j' + self.cc + ' ' + self.label + '\n'
@dataclass(frozen=True, eq=False)
class Jump(instr):
label: str
def __str__(self):
return indent_stmt() + 'jmp ' + self.label + '\n'
@dataclass(frozen=True, eq=False)
class IndirectJump(instr):
target: location
def __str__(self):
return indent_stmt() + 'jmp *' + str(self.target) + '\n'
@dataclass(frozen=True, eq=False)
class TailJump(instr):
func: arg
arity: int
def __str__(self):
return indent_stmt() + 'tailjmp ' + str(self.func) + '\n'
@dataclass(frozen=True)
class Variable(location):
id: str
def __str__(self):
return self.id
@dataclass(frozen=True)
class Immediate(arg):
value: int
def __str__(self):
return '$' + str(self.value)
@dataclass(frozen=True)
class Reg(location):
id: str
def __str__(self):
return '%' + self.id
@dataclass(frozen=True)
class ByteReg(Reg):
pass
@dataclass(frozen=True)
class Deref(arg):
reg: str
offset: int
def __str__(self):
return str(self.offset) + '(%' + self.reg + ')'
@dataclass(frozen=True)
class Global(arg):
name: str
def __str__(self):
return self.name + "(%rip)"