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"""Generate the main interpreter switch.
Reads the instruction definitions from bytecodes.c.
Writes the cases to generated_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,
)
from cwriter import CWriter
from typing import TextIO, Iterator
from lexer import Token
from stack import StackOffset, Stack, SizeMismatch
DEFAULT_OUTPUT = ROOT / "Python/generated_cases.c.h"
FOOTER = "#undef TIER_ONE\n"
def declare_variables(inst: Instruction, out: CWriter) -> None:
variables = {"unused"}
for uop in inst.parts:
if isinstance(uop, Uop):
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 write_uop(
uop: Part, out: CWriter, offset: int, stack: Stack, inst: Instruction, braces: bool
) -> int:
# out.emit(stack.as_comment() + "\n")
if isinstance(uop, Skip):
entries = "entries" if uop.size > 1 else "entry"
out.emit(f"/* Skip {uop.size} cache {entries} */\n")
return offset + uop.size
try:
out.start_line()
if braces:
out.emit(f"// {uop.name}\n")
for var in reversed(uop.stack.inputs):
out.emit(stack.pop(var))
if braces:
out.emit("{\n")
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 = "PyObject *"
reader = "read_obj"
else:
type = f"uint{cache.size*16}_t "
reader = f"read_u{cache.size*16}"
out.emit(
f"{type}{cache.name} = {reader}(&this_instr[{offset}].cache);\n"
)
offset += cache.size
emit_tokens(out, uop, stack, inst)
if uop.properties.stores_sp:
for i, var in enumerate(uop.stack.outputs):
out.emit(stack.push(var))
if braces:
out.start_line()
out.emit("}\n")
# out.emit(stack.as_comment() + "\n")
return offset
except SizeMismatch as ex:
raise analysis_error(ex.args[0], uop.body[0])
def uses_this(inst: Instruction) -> bool:
if inst.properties.needs_this:
return True
for uop in inst.parts:
if isinstance(uop, Skip):
continue
for cache in uop.caches:
if cache.name != "unused":
return True
return False
def generate_tier1(
filenames: list[str], analysis: Analysis, outfile: TextIO, lines: bool
) -> None:
write_header(__file__, filenames, outfile)
outfile.write(
"""
#ifdef TIER_TWO
#error "This file is for Tier 1 only"
#endif
#define TIER_ONE 1
"""
)
out = CWriter(outfile, 2, lines)
out.emit("\n")
for name, inst in sorted(analysis.instructions.items()):
needs_this = uses_this(inst)
out.emit("\n")
out.emit(f"TARGET({name}) {{\n")
if needs_this and not inst.is_target:
out.emit(f"_Py_CODEUNIT *this_instr = frame->instr_ptr = next_instr;\n")
else:
out.emit(f"frame->instr_ptr = next_instr;\n")
out.emit(f"next_instr += {inst.size};\n")
out.emit(f"INSTRUCTION_STATS({name});\n")
if inst.is_target:
out.emit(f"PREDICTED({name});\n")
if needs_this:
out.emit(f"_Py_CODEUNIT *this_instr = next_instr - {inst.size};\n")
if inst.family is not None:
out.emit(
f"static_assert({inst.family.size} == {inst.size-1}"
', "incorrect cache size");\n'
)
declare_variables(inst, out)
offset = 1 # The instruction itself
stack = Stack()
for part in inst.parts:
# Only emit braces if more than one uop
insert_braces = len([p for p in inst.parts if isinstance(p, Uop)]) > 1
offset = write_uop(part, out, offset, stack, inst, insert_braces)
out.start_line()
if not inst.parts[-1].properties.always_exits:
stack.flush(out)
if inst.parts[-1].properties.ends_with_eval_breaker:
out.emit("CHECK_EVAL_BREAKER();\n")
out.emit("DISPATCH();\n")
out.start_line()
out.emit("}")
out.emit("\n")
outfile.write(FOOTER)
arg_parser = argparse.ArgumentParser(
description="Generate the code for the interpreter switch.",
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)"
)
def generate_tier1_from_files(
filenames: list[str], outfilename: str, lines: bool
) -> None:
data = analyze_files(filenames)
with open(outfilename, "w") as outfile:
generate_tier1(filenames, data, outfile, lines)
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_tier1(args.input, data, outfile, args.emit_line_directives)
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