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"""Generate the cases for the tier 2 interpreter.
Reads the instruction definitions from bytecodes.c.
Writes the cases to executor_cases.c.h, which is #included in ceval.c.
"""
import argparse
import os.path
import sys
from analyzer import (
Analysis,
Instruction,
Uop,
Part,
analyze_files,
Skip,
StackItem,
analysis_error,
)
from generators_common import (
DEFAULT_INPUT,
ROOT,
write_header,
emit_tokens,
emit_to,
REPLACEMENT_FUNCTIONS,
)
from cwriter import CWriter
from typing import TextIO, Iterator
from lexer import Token
from stack import StackOffset, Stack, SizeMismatch
DEFAULT_OUTPUT = ROOT / "Python/executor_cases.c.h"
def declare_variables(uop: Uop, out: CWriter) -> None:
variables = {"unused"}
for var in reversed(uop.stack.inputs):
if var.name not in variables:
type = var.type if var.type else "PyObject *"
variables.add(var.name)
if var.condition:
out.emit(f"{type}{var.name} = NULL;\n")
else:
out.emit(f"{type}{var.name};\n")
for var in uop.stack.outputs:
if var.name not in variables:
variables.add(var.name)
type = var.type if var.type else "PyObject *"
if var.condition:
out.emit(f"{type}{var.name} = NULL;\n")
else:
out.emit(f"{type}{var.name};\n")
def tier2_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.to_c()
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 + "_tier_two")
out.emit(close)
def tier2_replace_deopt(
out: CWriter,
tkn: Token,
tkn_iter: Iterator[Token],
uop: Uop,
unused: Stack,
inst: Instruction | None,
) -> None:
out.emit_at("if ", tkn)
out.emit(next(tkn_iter))
emit_to(out, tkn_iter, "RPAREN")
next(tkn_iter) # Semi colon
out.emit(") goto deoptimize;\n")
TIER2_REPLACEMENT_FUNCTIONS = REPLACEMENT_FUNCTIONS.copy()
TIER2_REPLACEMENT_FUNCTIONS["ERROR_IF"] = tier2_replace_error
TIER2_REPLACEMENT_FUNCTIONS["DEOPT_IF"] = tier2_replace_deopt
def write_uop(uop: Uop, out: CWriter, stack: Stack) -> None:
try:
out.start_line()
if uop.properties.oparg:
out.emit("oparg = CURRENT_OPARG();\n")
for var in reversed(uop.stack.inputs):
out.emit(stack.pop(var))
if not uop.properties.stores_sp:
for i, var in enumerate(uop.stack.outputs):
out.emit(stack.push(var))
for cache in uop.caches:
if cache.name != "unused":
if cache.size == 4:
type = cast = "PyObject *"
else:
type = f"uint{cache.size*16}_t "
cast = f"uint{cache.size*16}_t"
out.emit(f"{type}{cache.name} = ({cast})CURRENT_OPERAND();\n")
emit_tokens(out, uop, stack, None, TIER2_REPLACEMENT_FUNCTIONS)
if uop.properties.stores_sp:
for i, var in enumerate(uop.stack.outputs):
out.emit(stack.push(var))
except SizeMismatch as ex:
raise analysis_error(ex.args[0], uop.body[0])
SKIPS = ("_EXTENDED_ARG",)
def generate_tier2(
filenames: list[str], analysis: Analysis, outfile: TextIO, lines: bool
) -> None:
write_header(__file__, filenames, outfile)
outfile.write(
"""
#ifdef TIER_ONE
#error "This file is for Tier 2 only"
#endif
#define TIER_TWO 2
"""
)
out = CWriter(outfile, 2, lines)
out.emit("\n")
for name, uop in analysis.uops.items():
if uop.properties.tier_one_only:
continue
if uop.is_super():
continue
if not uop.is_viable():
out.emit(f"/* {uop.name} is not a viable micro-op for tier 2 */\n\n")
continue
out.emit(f"case {uop.name}: {{\n")
declare_variables(uop, out)
stack = Stack()
write_uop(uop, out, stack)
out.start_line()
if not uop.properties.always_exits:
stack.flush(out)
if uop.properties.ends_with_eval_breaker:
out.emit("CHECK_EVAL_BREAKER();\n")
out.emit("break;\n")
out.start_line()
out.emit("}")
out.emit("\n\n")
outfile.write("#undef TIER_TWO\n")
arg_parser = argparse.ArgumentParser(
description="Generate the code for the tier 2 interpreter.",
formatter_class=argparse.ArgumentDefaultsHelpFormatter,
)
arg_parser.add_argument(
"-o", "--output", type=str, help="Generated code", default=DEFAULT_OUTPUT
)
arg_parser.add_argument(
"-l", "--emit-line-directives", help="Emit #line directives", action="store_true"
)
arg_parser.add_argument(
"input", nargs=argparse.REMAINDER, help="Instruction definition file(s)"
)
if __name__ == "__main__":
args = arg_parser.parse_args()
if len(args.input) == 0:
args.input.append(DEFAULT_INPUT)
data = analyze_files(args.input)
with open(args.output, "w") as outfile:
generate_tier2(args.input, data, outfile, args.emit_line_directives)
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