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|
from pathlib import Path
from typing import TextIO
from analyzer import (
Instruction,
Uop,
analyze_files,
Properties,
Skip,
)
from cwriter import CWriter
from typing import Callable, Mapping, TextIO, Iterator
from lexer import Token
from stack import StackOffset, Stack
ROOT = Path(__file__).parent.parent.parent
DEFAULT_INPUT = (ROOT / "Python/bytecodes.c").absolute().as_posix()
def root_relative_path(filename: str) -> str:
try:
return Path(filename).absolute().relative_to(ROOT).as_posix()
except ValueError:
# Not relative to root, just return original path.
return filename
def write_header(
generator: str, sources: list[str], outfile: TextIO, comment: str = "//"
) -> None:
outfile.write(
f"""{comment} This file is generated by {root_relative_path(generator)}
{comment} from:
{comment} {", ".join(root_relative_path(src) for src in sources)}
{comment} Do not edit!
"""
)
def emit_to(out: CWriter, tkn_iter: Iterator[Token], end: str) -> None:
parens = 0
for tkn in tkn_iter:
if tkn.kind == end and parens == 0:
return
if tkn.kind == "LPAREN":
parens += 1
if tkn.kind == "RPAREN":
parens -= 1
out.emit(tkn)
def replace_deopt(
out: CWriter,
tkn: Token,
tkn_iter: Iterator[Token],
uop: Uop,
unused: Stack,
inst: Instruction | None,
) -> None:
out.emit_at("DEOPT_IF", tkn)
out.emit(next(tkn_iter))
emit_to(out, tkn_iter, "RPAREN")
next(tkn_iter) # Semi colon
out.emit(", ")
assert inst is not None
assert inst.family is not None
out.emit(inst.family.name)
out.emit(");\n")
def replace_error(
out: CWriter,
tkn: Token,
tkn_iter: Iterator[Token],
uop: Uop,
stack: Stack,
inst: Instruction | None,
) -> None:
out.emit_at("if ", tkn)
out.emit(next(tkn_iter))
emit_to(out, tkn_iter, "COMMA")
label = next(tkn_iter).text
next(tkn_iter) # RPAREN
next(tkn_iter) # Semi colon
out.emit(") ")
c_offset = stack.peek_offset()
try:
offset = -int(c_offset)
close = ";\n"
except ValueError:
offset = None
out.emit(f"{{ stack_pointer += {c_offset}; ")
close = "; }\n"
out.emit("goto ")
if offset:
out.emit(f"pop_{offset}_")
out.emit(label)
out.emit(close)
def replace_error_no_pop(
out: CWriter,
tkn: Token,
tkn_iter: Iterator[Token],
uop: Uop,
stack: Stack,
inst: Instruction | None,
) -> None:
next(tkn_iter) # LPAREN
next(tkn_iter) # RPAREN
next(tkn_iter) # Semi colon
out.emit_at("goto error;", tkn)
def replace_decrefs(
out: CWriter,
tkn: Token,
tkn_iter: Iterator[Token],
uop: Uop,
stack: Stack,
inst: Instruction | None,
) -> None:
next(tkn_iter)
next(tkn_iter)
next(tkn_iter)
out.emit_at("", tkn)
for var in uop.stack.inputs:
if var.name == "unused" or var.name == "null" or var.peek:
continue
if var.size != "1":
out.emit(f"for (int _i = {var.size}; --_i >= 0;) {{\n")
out.emit(f"Py_DECREF({var.name}[_i]);\n")
out.emit("}\n")
elif var.condition:
if var.condition == "1":
out.emit(f"Py_DECREF({var.name});\n")
elif var.condition != "0":
out.emit(f"Py_XDECREF({var.name});\n")
else:
out.emit(f"Py_DECREF({var.name});\n")
def replace_sync_sp(
out: CWriter,
tkn: Token,
tkn_iter: Iterator[Token],
uop: Uop,
stack: Stack,
inst: Instruction | None,
) -> None:
next(tkn_iter)
next(tkn_iter)
next(tkn_iter)
stack.flush(out)
def replace_check_eval_breaker(
out: CWriter,
tkn: Token,
tkn_iter: Iterator[Token],
uop: Uop,
stack: Stack,
inst: Instruction | None,
) -> None:
next(tkn_iter)
next(tkn_iter)
next(tkn_iter)
if not uop.properties.ends_with_eval_breaker:
out.emit_at("CHECK_EVAL_BREAKER();", tkn)
REPLACEMENT_FUNCTIONS = {
"EXIT_IF": replace_deopt,
"DEOPT_IF": replace_deopt,
"ERROR_IF": replace_error,
"ERROR_NO_POP": replace_error_no_pop,
"DECREF_INPUTS": replace_decrefs,
"CHECK_EVAL_BREAKER": replace_check_eval_breaker,
"SYNC_SP": replace_sync_sp,
}
ReplacementFunctionType = Callable[
[CWriter, Token, Iterator[Token], Uop, Stack, Instruction | None], None
]
def emit_tokens(
out: CWriter,
uop: Uop,
stack: Stack,
inst: Instruction | None,
replacement_functions: Mapping[
str, ReplacementFunctionType
] = REPLACEMENT_FUNCTIONS,
) -> None:
tkns = uop.body[1:-1]
if not tkns:
return
tkn_iter = iter(tkns)
out.start_line()
for tkn in tkn_iter:
if tkn.kind == "IDENTIFIER" and tkn.text in replacement_functions:
replacement_functions[tkn.text](out, tkn, tkn_iter, uop, stack, inst)
else:
out.emit(tkn)
def cflags(p: Properties) -> str:
flags: list[str] = []
if p.oparg:
flags.append("HAS_ARG_FLAG")
if p.uses_co_consts:
flags.append("HAS_CONST_FLAG")
if p.uses_co_names:
flags.append("HAS_NAME_FLAG")
if p.jumps:
flags.append("HAS_JUMP_FLAG")
if p.has_free:
flags.append("HAS_FREE_FLAG")
if p.uses_locals:
flags.append("HAS_LOCAL_FLAG")
if p.eval_breaker:
flags.append("HAS_EVAL_BREAK_FLAG")
if p.deopts:
flags.append("HAS_DEOPT_FLAG")
if p.side_exit:
flags.append("HAS_EXIT_FLAG")
if not p.infallible:
flags.append("HAS_ERROR_FLAG")
if p.error_without_pop:
flags.append("HAS_ERROR_NO_POP_FLAG")
if p.escapes:
flags.append("HAS_ESCAPES_FLAG")
if p.pure:
flags.append("HAS_PURE_FLAG")
if p.oparg_and_1:
flags.append("HAS_OPARG_AND_1_FLAG")
if flags:
return " | ".join(flags)
else:
return "0"
|
