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|
#! /bin/python3
from __future__ import annotations
import os
import sys
from abc import ABC, abstractmethod
from enum import Enum
from typing import List
# ------------------------------------------------------------------------
# String buffer
level = 0
buffer = ""
def emit(s: str):
global buffer
buffer += s
def emitln(n=1):
global buffer
buffer += "\n"*n + (" " * level)
def enter_scope():
global level
emit("{")
level += 1
emitln()
def exits_scope():
global level
level -= 1
emitln()
emit("}")
# ------------------------------------------------------------------------
# Simple C AST
# TODO: Type checking
# Abstract class everything will derive from
# All AST nodes will have an "emit" function that outputs formatted C code
class Emitter(ABC):
@abstractmethod
def emit(self):
pass
# ------------------------------------------
# Representation of a C type
class TypeKind(Enum):
Void = "void"
Error = "error"
Int = "int"
Int32 = "int32"
Int64 = "int64"
# vectorized variants
Int32x4 = "__mm128i"
Int32x8 = "__mm256i"
Int64x2 = "__mm128i"
Int64x4 = "__mm256i"
Float32 = "float"
Float64 = "double"
# vectorized variants
Float32x4 = "__m128"
Float32x8 = "__mm256"
Float64x2 = "__mm128d"
Float64x4 = "__mm256d"
Pointer = "pointer"
Struct = "struct"
Enum = "enum"
Union = "union"
class Type(Emitter):
def emit(self):
pass
def emitspec(self, var):
pass
class Base(Type):
def __init__(self, name: str):
self.name = name
def emit(self):
emit(self.name)
def emitspec(self, ident):
emit(f"{ident}")
# Machine primitive types
Void = Base("void")
Error = Base("error")
Int = Base("int")
Int32 = Base("int32")
Int64 = Base("int64")
Int32x4 = Base("__mm128i")
Int32x8 = Base("__mm256i")
Int64x2 = Base("__mm128i")
Int64x4 = Base("__mm256i")
Float32 = Base("float")
Float64 = Base("double")
Float32x4 = Base("__m128")
Float32x8 = Base("__mm256")
Float64x2 = Base("__m128d")
Float64x4 = Base("__mm256d")
class Ptr(Type):
def __init__(self, to: Type):
self.to = to
def emit(self):
self.to.emit()
def emitspec(self, ident):
emit("*")
self.to.emitspec(ident)
class Array(Type):
def __init__(self, base: Type, len: int):
self.base = base
self.len = len
def emit(self):
self.base.emit()
def emitspec(self, ident):
self.base.emitspec(ident)
emit(f"[{self.len}]")
# TODO: Typedefs...
# ------------------------------------------
# C expressions
class Expr(Emitter):
def emit():
pass
# Binary operators
class BinOp(Expr):
def __init__(self, left: Expr, right: Expr):
self.l = left
self.r = right
def emit(self):
pass
# TODO: check types if they are vectorized and emit correct intrinsic
class Add(BinOp):
def emit(self):
self.l.emit()
emit(f" + ")
self.r.emit()
class Sub(BinOp):
def emit(self):
self.l.emit()
emit(f" - ")
self.r.emit()
class Mul(BinOp):
def emit(self):
self.l.emit()
emit(f" * ")
self.r.emit()
class Div(BinOp):
def emit(self):
self.l.emit()
emit(f" / ")
self.r.emit()
class Gt(BinOp):
def emit(self):
self.l.emit()
emit(f" > ")
self.r.emit()
class Lt(BinOp):
def emit(self):
self.l.emit()
emit(f" < ")
self.r.emit()
class Ge(BinOp):
def emit(self):
self.l.emit()
emit(f" >= ")
self.r.emit()
class Le(BinOp):
def emit(self):
self.l.emit()
emit(f" <= ")
self.r.emit()
class Eq(BinOp):
def emit(self):
self.l.emit()
emit(f" == ")
self.r.emit()
# Assignment (stores)
class Assign(Expr):
def __init__(self, lhs: Expr, rhs: Expr):
self.lhs = lhs
self.rhs = rhs
class Mv(Assign):
def emit(self):
self.lhs.emit()
emit(f" = ")
self.rhs.emit()
class AddMv(Assign):
def emit(self):
self.lhs.emit()
emit(f" += ")
self.rhs.emit()
class SubMv(Assign):
def emit(self):
self.lhs.emit()
emit(f" -= ")
self.rhs.emit()
class MulMv(Assign):
def emit(self):
self.lhs.emit()
emit(f" *= ")
self.rhs.emit()
class DivMv(Assign):
def emit(self):
self.lhs.emit()
emit(f" /= ")
self.rhs.emit()
class Comma(Expr):
def __init__(self, x: Expr, next: Expr):
self.expr = (x, next)
def emit(self):
self.expr[0].emit()
emit(", ")
self.expr[1].emit()
# Common assignments are kept globally
# C statements
class Stmt(Emitter):
def emit(self):
emit(";")
class Empty(Stmt):
def __init__(self):
pass
def emit(self):
super(Empty, self).emit()
class Block(Stmt):
def __init__(self, stmts: List[Stmt]):
self.stmts = stmts
def emit(self):
enter_scope()
for stmt in self.stmts:
stmt.emit()
exits_scope()
super(Block, self).emit()
class For(Stmt):
def __init__(self, init: Expr, cond: Expr, step: Expr, body: Stmt):
self.init = init
self.cond = cond
self.step = step
self.body = body
def emit(self):
emit("for (")
self.init.emit()
emit(";")
self.cond.emit()
emit(";")
self.step.emit()
emit(")")
self.body.emit()
super(For, self).emit()
class Return(Stmt):
def __init__(self, val: Expr):
self.val = val
def emit(self):
emitln()
emit("return ")
self.val.emit()
super(Return, self).emit()
class StmtExpr(Stmt):
def __init__(self, x: Expr):
self.x = x
def emit(self):
self.x.emit()
super(StmtExpr, self).emit()
class Mem(Enum):
Auto = ""
Static = "static"
Register = "register"
Typedef = "typedef"
External = "extern"
class Decl(Emitter):
def __init__(self):
pass
def emit(self):
pass
class Func(Decl):
def __init__(self, ident: str, ret: Expr = Void, params: List[Param] = [], vars: List[Var | List[Var]] = [], body: List[Stmt] = []):
self.ident = ident
self.ret = ret
self.params = params
self.vars = vars
self.stmts = body
def emit(self):
self.ret.emit()
emitln()
emit(self.ident)
emit("(")
for i, p in enumerate(self.params):
p.emittype()
emit(" ")
p.emitspec()
if i < len(self.params) - 1:
emit(", ")
emit(")\n")
enter_scope()
for var in self.vars:
if isinstance(var, list):
v = var[0]
v.emittype()
emit(" ")
v.emitspec()
for v in var[1:]:
emit(", ")
v.emitspec()
else:
var.emittype()
emit(" ")
var.emitspec()
emit(";")
emitln()
emitln()
for stmt in self.stmts:
stmt.emit()
exits_scope()
def declare(self, var: Var, *vars: List[Var]):
self.vars.append(var)
self.vars.extend(vars)
def instruct(self, stmt: Stmt | Expr, *args: List[Stmt | Expr]):
def push(n):
if isinstance(n, Stmt):
self.stmts.append(n)
elif isinstance(n, Expr):
self.stmts.append(StmtExpr(n))
else:
raise TypeError("unrecognized type for function")
push(stmt)
for arg in args:
push(arg)
class Var(Decl):
def __init__(self, type: Type, name: str, storage: Mem = Mem.Auto):
self.name = name
self.type = type
self.storage = storage
def emit(self):
emit(f"{self.name}")
def emittype(self):
if self.storage != Mem.Auto:
emit(self.storage.value)
emit(" ")
self.type.emit()
def emitspec(self):
self.type.emitspec(self.name)
class Param(Var):
def __init__(self, type: Type, name: str):
return super(Param, self).__init__(type, name, mem.Auto)
# ------------------------------------------------------------------------
# AST modification functions
|