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# lib9p/protogen/c.py - Generate 9p.generated.c
#
# Copyright (C) 2024-2025 Luke T. Shumaker <lukeshu@lukeshu.com>
# SPDX-License-Identifier: AGPL-3.0-or-later
import sys
import idl
from . import c9util, c_marshal, c_unmarshal, c_validate, cutil
# This strives to be "general-purpose" in that it just acts on the
# *.9p inputs; but (unfortunately?) there are a few special-cases in
# this script, marked with "SPECIAL".
# pylint: disable=unused-variable
__all__ = ["gen_c"]
def gen_c(versions: set[str], typs: list[idl.UserType]) -> str:
cutil.ifdef_init()
ret = f"""/* Generated by `{' '.join(sys.argv)}`. DO NOT EDIT! */
#include <stdbool.h>
#include <stddef.h> /* for size_t */
#include <inttypes.h> /* for PRI* macros */
#include <string.h> /* for memset() */
#include <libmisc/assert.h>
#include <lib9p/9p.h>
#include "internal.h"
"""
# utilities ################################################################
ret += """
/* utilities ******************************************************************/
"""
id2typ: dict[int, idl.Message] = {}
for msg in [msg for msg in typs if isinstance(msg, idl.Message)]:
id2typ[msg.msgid] = msg
def msg_table(grp: str, meth: str, tentry: str, rng: tuple[int, int, int]) -> str:
ret = f"const {tentry} {c9util.ident(f'_table_{grp}_{meth}')}[{c9util.ver_enum('NUM')}][{hex(len(range(*rng)))}] = {{\n"
for ver in ["unknown", *sorted(versions)]:
if ver != "unknown":
ret += cutil.ifdef_push(1, c9util.ver_ifdef({ver}))
ret += f"\t[{c9util.ver_enum(ver)}] = {{\n"
for n in range(*rng):
xmsg: idl.Message | None = id2typ.get(n, None)
if xmsg:
if ver == "unknown": # SPECIAL (initialization)
if xmsg.typname not in ["Tversion", "Rversion", "Rerror"]:
xmsg = None
else:
if ver not in xmsg.in_versions:
xmsg = None
if xmsg:
ret += f"\t\t_MSG_{meth.upper()}({xmsg.typname}),\n"
ret += "\t},\n"
ret += cutil.ifdef_pop(0)
ret += "};\n"
return ret
for v in sorted(versions):
ret += f"#if CONFIG_9P_ENABLE_{v.replace('.', '_')}\n"
ret += (
f"\t#define _is_ver_{v.replace('.', '_')}(v) (v == {c9util.ver_enum(v)})\n"
)
ret += "#else\n"
ret += f"\t#define _is_ver_{v.replace('.', '_')}(v) false\n"
ret += "#endif\n"
ret += "\n"
ret += "/**\n"
ret += f" * is_ver(ctx, ver) is essentially `(ctx->ctx->version == {c9util.Ident('VER_')}##ver)`,\n"
ret += f" * but compiles correctly (to `false`) even if `{c9util.Ident('VER_')}##ver` isn't defined\n"
ret += " * (because `!CONFIG_9P_ENABLE_##ver`). This is useful when `||`ing\n"
ret += " * several version checks together.\n"
ret += " */\n"
ret += "#define is_ver(CTX, ver) _is_ver_##ver(CTX->ctx->version)\n"
# strings ##################################################################
ret += f"""
/* strings ********************************************************************/
const char *const {c9util.ident('_table_ver_name')}[{c9util.ver_enum('NUM')}] = {{
"""
for ver in ["unknown", *sorted(versions)]:
if ver in versions:
ret += cutil.ifdef_push(1, c9util.ver_ifdef({ver}))
ret += f'\t[{c9util.ver_enum(ver)}] = "{ver}",\n'
ret += cutil.ifdef_pop(0)
ret += "};\n"
ret += "\n"
ret += f"#define _MSG_NAME(typ) [{c9util.Ident('TYP_')}##typ] = #typ\n"
ret += msg_table("msg", "name", "char *const", (0, 0x100, 1))
# bitmasks #################################################################
ret += """
/* bitmasks *******************************************************************/
"""
for typ in typs:
if not isinstance(typ, idl.Bitfield):
continue
ret += "\n"
ret += cutil.ifdef_push(1, c9util.ver_ifdef(typ.in_versions))
ret += f"static const {c9util.typename(typ)} {typ.typname}_masks[{c9util.ver_enum('NUM')}] = {{\n"
verwidth = max(len(ver) for ver in versions)
for ver in sorted(versions):
ret += cutil.ifdef_push(2, c9util.ver_ifdef({ver}))
ret += (
f"\t[{c9util.ver_enum(ver)}]{' '*(verwidth-len(ver))} = 0b"
+ "".join(
(
"1"
if bit.cat in (idl.BitCat.USED, idl.BitCat.SUBFIELD)
and ver in bit.in_versions
else "0"
)
for bit in reversed(typ.bits)
)
+ ",\n"
)
ret += cutil.ifdef_pop(1)
ret += "};\n"
ret += cutil.ifdef_pop(0)
# validate_* ###############################################################
ret += c_validate.gen_c_validate(versions, typs)
# unmarshal_* ##############################################################
ret += c_unmarshal.gen_c_unmarshal(versions, typs)
# marshal_* ################################################################
ret += c_marshal.gen_c_marshal(versions, typs)
# function tables ##########################################################
ret += """
/* function tables ************************************************************/
"""
ret += "\n"
ret += f"const uint32_t {c9util.ident('_table_msg_min_size')}[{c9util.ver_enum('NUM')}] = {{\n"
rerror = next(typ for typ in typs if typ.typname == "Rerror")
ret += f"\t[{c9util.ver_enum('unknown')}] = {rerror.min_size('9P2000')},\n" # SPECIAL (initialization)
for ver in sorted(versions):
ret += cutil.ifdef_push(1, c9util.ver_ifdef({ver}))
ret += f"\t[{c9util.ver_enum(ver)}] = {rerror.min_size(ver)},\n"
ret += cutil.ifdef_pop(0)
ret += "};\n"
ret += "\n"
ret += cutil.macro(
f"#define _MSG_RECV(typ) [{c9util.Ident('TYP_')}##typ/2] = {{\n"
f"\t\t.basesize = sizeof(struct {c9util.ident('msg_')}##typ),\n"
f"\t\t.validate = validate_##typ,\n"
f"\t\t.unmarshal = (_unmarshal_fn_t)unmarshal_##typ,\n"
f"\t}}\n"
)
ret += cutil.macro(
f"#define _MSG_SEND(typ) [{c9util.Ident('TYP_')}##typ/2] = {{\n"
f"\t\t.marshal = (_marshal_fn_t)marshal_##typ,\n"
f"\t}}\n"
)
ret += "\n"
ret += msg_table(
"Tmsg", "recv", f"struct {c9util.ident('_recv_tentry')}", (0, 0x100, 2)
)
ret += "\n"
ret += msg_table(
"Rmsg", "recv", f"struct {c9util.ident('_recv_tentry')}", (1, 0x100, 2)
)
ret += "\n"
ret += msg_table(
"Tmsg", "send", f"struct {c9util.ident('_send_tentry')}", (0, 0x100, 2)
)
ret += "\n"
ret += msg_table(
"Rmsg", "send", f"struct {c9util.ident('_send_tentry')}", (1, 0x100, 2)
)
ret += f"""
LM_FLATTEN ssize_t {c9util.ident('_stat_validate')}(struct _validate_ctx *ctx, uint32_t *ret_net_size) {{
\treturn validate_stat(ctx, ret_net_size);
}}
LM_FLATTEN void {c9util.ident('_stat_unmarshal')}(struct _unmarshal_ctx *ctx, struct {c9util.ident('stat')} *out) {{
\tunmarshal_stat(ctx, out);
}}
LM_FLATTEN bool {c9util.ident('_stat_marshal')}(struct _marshal_ctx *ctx, struct {c9util.ident('stat')} *val) {{
\treturn marshal_stat(ctx, val);
}}
"""
############################################################################
return ret
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