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gh-105481: reduce repetition in opcode metadata generation code (#107942)

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Irit Katriel 2023-08-14 19:36:29 +01:00 • committed by GitHub
parent 6fbaba552a
commit 39745347f6
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2 changed files with 61 additions and 76 deletions
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108
Tools/cases_generator/generate_cases.py
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@ -4,6 +4,7 @@ Writes the cases to generated_cases.c.h, which is #included in ceval.c.
"""
import argparse
import contextlib
import os
import posixpath
import sys
@ -141,6 +142,15 @@ class Generator(Analyzer):
typing.assert_never(thing)
return instr, popped, pushed
@contextlib.contextmanager
def metadata_item(self, signature, open, close):
self.out.emit("")
self.out.emit(f"extern {signature};")
self.out.emit("#ifdef NEED_OPCODE_METADATA")
with self.out.block(f"{signature} {open}", close):
yield
self.out.emit("#endif // NEED_OPCODE_METADATA")
def write_stack_effect_functions(self) -> None:
popped_data: list[tuple[AnyInstruction, str]] = []
pushed_data: list[tuple[AnyInstruction, str]] = []
@ -156,25 +166,16 @@ class Generator(Analyzer):
def write_function(
direction: str, data: list[tuple[AnyInstruction, str]]
) -> None:
self.out.emit("")
self.out.emit("#ifndef NEED_OPCODE_METADATA")
self.out.emit(
f"extern int _PyOpcode_num_{direction}(int opcode, int oparg, bool jump);"
)
self.out.emit("#else")
self.out.emit("int")
self.out.emit(
f"_PyOpcode_num_{direction}(int opcode, int oparg, bool jump) {{"
)
self.out.emit(" switch(opcode) {")
for instr, effect in data:
self.out.emit(f" case {instr.name}:")
self.out.emit(f" return {effect};")
self.out.emit(" default:")
self.out.emit(" return -1;")
self.out.emit(" }")
self.out.emit("}")
self.out.emit("#endif")
with self.metadata_item(
f"int _PyOpcode_num_{direction}(int opcode, int oparg, bool jump)", "", ""
):
with self.out.block("switch(opcode)"):
for instr, effect in data:
self.out.emit(f"case {instr.name}:")
self.out.emit(f" return {effect};")
self.out.emit("default:")
self.out.emit(" return -1;")
write_function("popped", popped_data)
write_function("pushed", pushed_data)
@ -290,48 +291,33 @@ class Generator(Analyzer):
self.out.emit("#define OPCODE_METADATA_SIZE 512")
self.out.emit("#define OPCODE_UOP_NAME_SIZE 512")
self.out.emit("#define OPCODE_MACRO_EXPANSION_SIZE 256")
self.out.emit("")
self.out.emit("#ifndef NEED_OPCODE_METADATA")
self.out.emit(
"extern const struct opcode_metadata "
"_PyOpcode_opcode_metadata[OPCODE_METADATA_SIZE];"
)
self.out.emit(
"extern const struct opcode_macro_expansion "
"_PyOpcode_macro_expansion[OPCODE_MACRO_EXPANSION_SIZE];"
)
self.out.emit(
"extern const char * const _PyOpcode_uop_name[OPCODE_UOP_NAME_SIZE];"
)
self.out.emit("#else // if NEED_OPCODE_METADATA")
self.out.emit(
with self.metadata_item(
"const struct opcode_metadata "
"_PyOpcode_opcode_metadata[OPCODE_METADATA_SIZE] = {"
)
"_PyOpcode_opcode_metadata[OPCODE_METADATA_SIZE]",
"=",
";"
):
# Write metadata for each instruction
for thing in self.everything:
match thing:
case OverriddenInstructionPlaceHolder():
continue
case parsing.InstDef():
if thing.kind != "op":
self.write_metadata_for_inst(self.instrs[thing.name])
case parsing.Macro():
self.write_metadata_for_macro(self.macro_instrs[thing.name])
case parsing.Pseudo():
self.write_metadata_for_pseudo(self.pseudo_instrs[thing.name])
case _:
typing.assert_never(thing)
# Write metadata for each instruction
for thing in self.everything:
match thing:
case OverriddenInstructionPlaceHolder():
continue
case parsing.InstDef():
if thing.kind != "op":
self.write_metadata_for_inst(self.instrs[thing.name])
case parsing.Macro():
self.write_metadata_for_macro(self.macro_instrs[thing.name])
case parsing.Pseudo():
self.write_metadata_for_pseudo(self.pseudo_instrs[thing.name])
case _:
typing.assert_never(thing)
# Write end of array
self.out.emit("};")
with self.out.block(
with self.metadata_item(
"const struct opcode_macro_expansion "
"_PyOpcode_macro_expansion[OPCODE_MACRO_EXPANSION_SIZE] =",
";",
"_PyOpcode_macro_expansion[OPCODE_MACRO_EXPANSION_SIZE]",
"=",
";"
):
# Write macro expansion for each non-pseudo instruction
for thing in self.everything:
@ -360,13 +346,11 @@ class Generator(Analyzer):
case _:
typing.assert_never(thing)
with self.out.block(
"const char * const _PyOpcode_uop_name[OPCODE_UOP_NAME_SIZE] =", ";"
with self.metadata_item(
"const char * const _PyOpcode_uop_name[OPCODE_UOP_NAME_SIZE]", "=", ";"
):
self.write_uop_items(lambda name, counter: f'[{name}] = "{name}",')
self.out.emit("#endif // NEED_OPCODE_METADATA")
with open(pymetadata_filename, "w") as f:
# Create formatter
self.out = Formatter(f, 0, comment="#")
@ -511,7 +495,7 @@ class Generator(Analyzer):
if not flag_names:
flag_names.append("0")
self.out.emit(
f" [{name}] = {{ true, {INSTR_FMT_PREFIX}{fmt},"
f"[{name}] = {{ true, {INSTR_FMT_PREFIX}{fmt},"
f" {' | '.join(flag_names)} }},"
)