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-rwxr-xr-xlib9p/idl.gen750
1 files changed, 622 insertions, 128 deletions
diff --git a/lib9p/idl.gen b/lib9p/idl.gen
index adb15ce..f2b4f13 100755
--- a/lib9p/idl.gen
+++ b/lib9p/idl.gen
@@ -5,6 +5,7 @@
# Copyright (C) 2024-2025 Luke T. Shumaker <lukeshu@lukeshu.com>
# SPDX-License-Identifier: AGPL-3.0-or-later
+import enum
import graphlib
import os.path
import sys
@@ -145,6 +146,9 @@ def ifdef_pop(n: int) -> str:
return ret
+# topo_sorted() ################################################################
+
+
def topo_sorted(typs: list[idl.Type]) -> typing.Iterable[idl.Type]:
ts: graphlib.TopologicalSorter[idl.Type] = graphlib.TopologicalSorter()
for typ in typs:
@@ -163,6 +167,189 @@ def topo_sorted(typs: list[idl.Type]) -> typing.Iterable[idl.Type]:
return ts.static_order()
+# walk() #######################################################################
+
+
+class Path:
+ root: idl.Type
+ elems: list[idl.StructMember]
+
+ def __init__(
+ self, root: idl.Type, elems: list[idl.StructMember] | None = None
+ ) -> None:
+ self.root = root
+ self.elems = elems if elems is not None else []
+
+ def add(self, elem: idl.StructMember) -> "Path":
+ return Path(self.root, self.elems + [elem])
+
+ def parent(self) -> "Path":
+ return Path(self.root, self.elems[:-1])
+
+ def c_str(self, base: str, loopdepth: int = 0) -> str:
+ ret = base
+ for i, elem in enumerate(self.elems):
+ if i > 0:
+ ret += "."
+ ret += elem.name
+ if elem.cnt:
+ ret += f"[{chr(ord('i')+loopdepth)}]"
+ loopdepth += 1
+ return ret
+
+ def __str__(self) -> str:
+ return self.c_str(self.root.name + "->")
+
+
+class WalkCmd(enum.Enum):
+ KEEP_GOING = 1
+ DONT_RECURSE = 2
+ ABORT = 3
+
+
+type WalkHandler = typing.Callable[
+ [Path], tuple[WalkCmd, typing.Callable[[], None] | None]
+]
+
+
+def _walk(path: Path, handle: WalkHandler) -> WalkCmd:
+ typ = path.elems[-1].typ if path.elems else path.root
+
+ ret, atexit = handle(path)
+
+ if isinstance(typ, idl.Struct):
+ match ret:
+ case WalkCmd.KEEP_GOING:
+ for member in typ.members:
+ if _walk(path.add(member), handle) == WalkCmd.ABORT:
+ ret = WalkCmd.ABORT
+ break
+ case WalkCmd.DONT_RECURSE:
+ ret = WalkCmd.KEEP_GOING
+ case WalkCmd.ABORT:
+ ret = WalkCmd.ABORT
+ case _:
+ assert False, f"invalid cmd: {ret}"
+
+ if atexit:
+ atexit()
+ return ret
+
+
+def walk(typ: idl.Type, handle: WalkHandler) -> None:
+ _walk(Path(typ), handle)
+
+
+# get_buffer_size() ############################################################
+
+
+class BufferSize:
+ min_size: int # really just here to sanity-check against typ.min_size(version)
+ exp_size: int # "expected" or max-reasonable size
+ max_size: int # really just here to sanity-check against typ.max_size(version)
+ max_copy: int
+ max_copy_extra: str
+ max_iov: int
+ max_iov_extra: str
+ _starts_with_copy: bool
+ _ends_with_copy: bool
+
+ def __init__(self) -> None:
+ self.min_size = 0
+ self.exp_size = 0
+ self.max_size = 0
+ self.max_copy = 0
+ self.max_copy_extra = ""
+ self.max_iov = 0
+ self.max_iov_extra = ""
+ self._starts_with_copy = False
+ self._ends_with_copy = False
+
+
+def get_buffer_size(typ: idl.Type, version: str) -> BufferSize:
+ assert isinstance(typ, idl.Primitive) or (version in typ.in_versions)
+
+ ret = BufferSize()
+
+ if not isinstance(typ, idl.Struct):
+ assert typ.static_size
+ ret.min_size = typ.static_size
+ ret.exp_size = typ.static_size
+ ret.max_size = typ.static_size
+ ret.max_copy = typ.static_size
+ ret.max_iov = 1
+ ret._starts_with_copy = True
+ ret._ends_with_copy = True
+ return ret
+
+ def handle(path: Path) -> tuple[WalkCmd, None]:
+ nonlocal ret
+ if path.elems:
+ child = path.elems[-1]
+ if version not in child.in_versions:
+ return WalkCmd.DONT_RECURSE, None
+ if child.cnt:
+ if child.typ.static_size == 1: # SPECIAL (zerocopy)
+ ret.max_iov += 1
+ # HEURISTIC: 27 for strings (max-strlen from 9P1), 8KiB for other data
+ ret.exp_size += 27 if child.name == "utf8" else 8192
+ ret.max_size += child.max_cnt
+ ret._ends_with_copy = False
+ return WalkCmd.DONT_RECURSE, None
+ sub = get_buffer_size(child.typ, version)
+ ret.exp_size += sub.exp_size * 16 # HEURISTIC: MAXWELEM
+ ret.max_size += sub.max_size * child.max_cnt
+ if child.name == "wname" and path.root.name in (
+ "Tsread",
+ "Tswrite",
+ ): # SPECIAL (9P2000.e)
+ assert ret._ends_with_copy
+ assert sub._starts_with_copy
+ assert not sub._ends_with_copy
+ ret.max_copy_extra = (
+ f" + (CONFIG_9P_MAX_9P2000_e_WELEM * {sub.max_copy})"
+ )
+ ret.max_iov_extra = (
+ f" + (CONFIG_9P_MAX_9P2000_e_WELEM * {sub.max_iov})"
+ )
+ ret.max_iov -= 1
+ else:
+ ret.max_copy += sub.max_copy * child.max_cnt
+ if sub.max_iov == 1 and sub._starts_with_copy: # is purely copy
+ ret.max_iov += 1
+ else: # contains zero-copy segments
+ ret.max_iov += sub.max_iov * child.max_cnt
+ if ret._ends_with_copy and sub._starts_with_copy:
+ # we can merge this one
+ ret.max_iov -= 1
+ if (
+ sub._ends_with_copy
+ and sub._starts_with_copy
+ and sub.max_iov > 1
+ ):
+ # we can merge these
+ ret.max_iov -= child.max_cnt - 1
+ ret._ends_with_copy = sub._ends_with_copy
+ return WalkCmd.DONT_RECURSE, None
+ elif not isinstance(child.typ, idl.Struct):
+ assert child.typ.static_size
+ if not ret._ends_with_copy:
+ if ret.max_size == 0:
+ ret._starts_with_copy = True
+ ret.max_iov += 1
+ ret._ends_with_copy = True
+ ret.min_size += child.typ.static_size
+ ret.exp_size += child.typ.static_size
+ ret.max_size += child.typ.static_size
+ ret.max_copy += child.typ.static_size
+ return WalkCmd.KEEP_GOING, None
+
+ walk(typ, handle)
+ assert ret.min_size == typ.min_size(version)
+ assert ret.max_size == typ.max_size(version)
+ return ret
+
+
# Generate .h ##################################################################
@@ -177,6 +364,8 @@ def gen_h(versions: set[str], typs: list[idl.Type]) -> str:
#endif
#include <stdint.h> /* for uint{{n}}_t types */
+
+#include <libhw/generic/net.h> /* for struct iovec */
"""
id2typ: dict[int, idl.Message] = {}
@@ -192,6 +381,14 @@ def gen_h(versions: set[str], typs: list[idl.Type]) -> str:
ret += "\n"
ret += f"#ifndef {c_ver_ifdef({ver})}\n"
ret += f"\t#error config.h must define {c_ver_ifdef({ver})}\n"
+ if ver == "9P2000.e": # SPECIAL (9P2000.e)
+ ret += "#else\n"
+ ret += f"\t#if {c_ver_ifdef({ver})}\n"
+ ret += "\t\t#ifndef(CONFIG_9P_MAX_9P2000_e_WELEM)\n"
+ ret += f"\t\t\t#error if {c_ver_ifdef({ver})} then config.h must define CONFIG_9P_MAX_9P2000_e_WELEM\n"
+ ret += "\t\t#endif\n"
+ ret += "\t\tstatic_assert(CONFIG_9P_MAX_9P2000_e_WELEM > 0);\n"
+ ret += "\t#endif\n"
ret += "#endif\n"
ret += f"""
@@ -251,16 +448,20 @@ enum {idprefix}version {{
ret += ifdef_push(1, c_ver_ifdef(typ.in_versions))
def sum_size(typ: idl.Type, version: str) -> str:
- min_size = typ.min_size(version)
- max_size = typ.max_size(version)
- assert min_size <= max_size and max_size < u64max
+ sz = get_buffer_size(typ, version)
+ assert (
+ sz.min_size <= sz.exp_size
+ and sz.exp_size <= sz.max_size
+ and sz.max_size < u64max
+ )
ret = ""
- if min_size == max_size:
- ret += f"size = {min_size:,}"
+ if sz.min_size == sz.max_size:
+ ret += f"size = {sz.min_size:,}"
else:
- ret += f"min_size = {min_size:,} ; max_size = {max_size:,}"
- if max_size > u32max:
+ ret += f"min_size = {sz.min_size:,} ; exp_size = {sz.exp_size:,} ; max_size = {sz.max_size:,}"
+ if sz.max_size > u32max:
ret += " (warning: >UINT32_MAX)"
+ ret += f" ; max_iov = {sz.max_iov:,}{sz.max_iov_extra} ; max_copy = {sz.max_copy:,}{sz.max_copy_extra}"
return ret
ret += per_version_comment(typ, sum_size)
@@ -331,6 +532,87 @@ enum {idprefix}version {{
ret += "};\n"
ret += ifdef_pop(0)
+ ret += """
+/* containers *****************************************************************/
+"""
+ ret += "\n"
+ ret += f"#define _{idprefix.upper()}MAX(a, b) ((a) > (b)) ? (a) : (b)\n"
+
+ tmsg_max_iov: dict[str, int] = {}
+ tmsg_max_copy: dict[str, int] = {}
+ rmsg_max_iov: dict[str, int] = {}
+ rmsg_max_copy: dict[str, int] = {}
+ for typ in typs:
+ if not isinstance(typ, idl.Message):
+ continue
+ if typ.name in ("Tsread", "Tswrite"): # SPECIAL (9P2000.e)
+ continue
+ max_iov = tmsg_max_iov if typ.msgid % 2 == 0 else rmsg_max_iov
+ max_copy = tmsg_max_copy if typ.msgid % 2 == 0 else rmsg_max_copy
+ for version in typ.in_versions:
+ if version not in max_iov:
+ max_iov[version] = 0
+ max_copy[version] = 0
+ sz = get_buffer_size(typ, version)
+ if sz.max_iov > max_iov[version]:
+ max_iov[version] = sz.max_iov
+ if sz.max_copy > max_copy[version]:
+ max_copy[version] = sz.max_copy
+
+ for name, table in [
+ ("tmsg_max_iov", tmsg_max_iov),
+ ("tmsg_max_copy", tmsg_max_copy),
+ ("rmsg_max_iov", rmsg_max_iov),
+ ("rmsg_max_copy", rmsg_max_copy),
+ ]:
+ inv: dict[int, set[str]] = {}
+ for version, maxval in table.items():
+ if maxval not in inv:
+ inv[maxval] = set()
+ inv[maxval].add(version)
+
+ ret += "\n"
+ directive = "if"
+ seen_e = False # SPECIAL (9P2000.e)
+ for maxval in sorted(inv, reverse=True):
+ ret += f"#{directive} {c_ver_ifdef(inv[maxval])}\n"
+ indent = 1
+ if name.startswith("tmsg") and not seen_e: # SPECIAL (9P2000.e)
+ typ = next(typ for typ in typs if typ.name == "Tswrite")
+ sz = get_buffer_size(typ, "9P2000.e")
+ match name:
+ case "tmsg_max_iov":
+ maxexpr = f"{sz.max_iov}{sz.max_iov_extra}"
+ case "tmsg_max_copy":
+ maxexpr = f"{sz.max_copy}{sz.max_copy_extra}"
+ case _:
+ assert False
+ ret += f"\t#if {c_ver_ifdef({"9P2000.e"})}\n"
+ ret += f"\t\t#define {idprefix.upper()}{name.upper()} _{idprefix.upper()}MAX({maxval}, {maxexpr})\n"
+ ret += f"\t#else\n"
+ indent += 1
+ ret += f"{'\t'*indent}#define {idprefix.upper()}{name.upper()} {maxval}\n"
+ if name.startswith("tmsg") and not seen_e: # SPECIAL (9P2000.e)
+ ret += "\t#endif\n"
+ if "9P2000.e" in inv[maxval]:
+ seen_e = True
+ directive = "elif"
+ ret += "#endif\n"
+
+ ret += "\n"
+ ret += f"struct {idprefix}Tmsg_send_buf {{\n"
+ ret += f"\tsize_t iov_cnt;\n"
+ ret += f"\tstruct iovec iov[{idprefix.upper()}TMSG_MAX_IOV];\n"
+ ret += f"\tuint8_t copied[{idprefix.upper()}TMSG_MAX_COPY];\n"
+ ret += "};\n"
+
+ ret += "\n"
+ ret += f"struct {idprefix}Rmsg_send_buf {{\n"
+ ret += f"\tsize_t iov_cnt;\n"
+ ret += f"\tstruct iovec iov[{idprefix.upper()}RMSG_MAX_IOV];\n"
+ ret += f"\tuint8_t copied[{idprefix.upper()}RMSG_MAX_COPY];\n"
+ ret += "};\n"
+
return ret
@@ -549,7 +831,10 @@ LM_ALWAYS_INLINE static bool validate_8(struct _validate_ctx *ctx) { return _val
if member.in_versions != typ.in_versions:
ret += "( " + c_ver_cond(member.in_versions) + " && "
if member.cnt is not None:
- ret += f"_validate_list(ctx, {member.cnt.name}, validate_{member.typ.name}, sizeof({c_typename(member.typ)}))"
+ if member.typ.static_size == 1: # SPECIAL (zerocopy)
+ ret += f"_validate_size_net(ctx, {member.cnt.name})"
+ else:
+ ret += f"_validate_list(ctx, {member.cnt.name}, validate_{member.typ.name}, sizeof({c_typename(member.typ)}))"
if typ.name == "s": # SPECIAL (string)
ret += f'\n\t || ({{ (!is_valid_utf8_without_nul(&ctx->net_bytes[ctx->net_offset-len], len)) && lib9p_error(ctx->ctx, LINUX_EBADMSG, "message contains invalid UTF-8"); }})'
else:
@@ -653,13 +938,15 @@ LM_ALWAYS_INLINE static void unmarshal_8(struct _unmarshal_ctx *ctx, uint64_t *o
if member.in_versions != typ.in_versions:
ret += "{\n"
ret += prefix
- ret += f"out->{member.name} = ctx->extra;\n"
- ret += f"{prefix}ctx->extra += sizeof(out->{member.name}[0]) * out->{member.cnt.name};\n"
- ret += f"{prefix}for (typeof(out->{member.cnt.name}) i = 0; i < out->{member.cnt.name}; i++)\n"
- if member.typ.static_size == 1: # SPECIAL (string)
- # Special-case is that we cast from `char` to `uint8_t`.
- ret += f"{prefix}\tunmarshal_{member.typ.name}(ctx, (uint8_t *)&out->{member.name}[i]);\n"
+ if member.typ.static_size == 1: # SPECIAL (string, zerocopy)
+ ret += f"out->{member.name} = (char *)&ctx->net_bytes[ctx->net_offset];\n"
+ ret += (
+ f"{prefix}ctx->net_offset += out->{member.cnt.name};\n"
+ )
else:
+ ret += f"out->{member.name} = ctx->extra;\n"
+ ret += f"{prefix}ctx->extra += sizeof(out->{member.name}[0]) * out->{member.cnt.name};\n"
+ ret += f"{prefix}for (typeof(out->{member.cnt.name}) i = 0; i < out->{member.cnt.name}; i++)\n"
ret += f"{prefix}\tunmarshal_{member.typ.name}(ctx, &out->{member.name}[i]);\n"
if member.in_versions != typ.in_versions:
ret += "\t}\n"
@@ -675,139 +962,346 @@ LM_ALWAYS_INLINE static void unmarshal_8(struct _unmarshal_ctx *ctx, uint64_t *o
ret += """
/* marshal_* ******************************************************************/
-LM_ALWAYS_INLINE static bool _marshal_too_large(struct _marshal_ctx *ctx) {
-\tlib9p_errorf(ctx->ctx, LINUX_ERANGE, "%s too large to marshal into %s limit (limit=%"PRIu32")",
-\t\t(ctx->net_bytes[4] % 2 == 0) ? "T-message" : "R-message",
-\t\tctx->ctx->version ? "negotiated" : ((ctx->net_bytes[4] % 2 == 0) ? "client" : "server"),
-\t\tctx->ctx->max_msg_size);
-\treturn true;
-}
+"""
+ ret += c_macro(
+ "#define MARSHAL_BYTES_ZEROCOPY(ctx, data, len)\n"
+ "\tif (ctx->net_iov[ctx->net_iov_cnt-1].iov_len)\n"
+ "\t\tctx->net_iov_cnt++;\n"
+ "\tctx->net_iov[ctx->net_iov_cnt-1].iov_base = data;\n"
+ "\tctx->net_iov[ctx->net_iov_cnt-1].iov_len = len;\n"
+ "\tctx->net_iov_cnt++;\n"
+ )
+ ret += c_macro(
+ "#define MARSHAL_BYTES(ctx, data, len)\n"
+ "\tif (!ctx->net_iov[ctx->net_iov_cnt-1].iov_base)\n"
+ "\t\tctx->net_iov[ctx->net_iov_cnt-1].iov_base = &ctx->net_copied[ctx->net_copied_size];\n"
+ "\tmemcpy(&ctx->net_copied[ctx->net_copied_size], data, len);\n"
+ "\tctx->net_copied_size += len;\n"
+ "\tctx->net_iov[ctx->net_iov_cnt-1].iov_len += len;\n"
+ )
+ ret += c_macro(
+ "#define MARSHAL_U8LE(ctx, val)\n"
+ "\tif (!ctx->net_iov[ctx->net_iov_cnt-1].iov_base)\n"
+ "\t\tctx->net_iov[ctx->net_iov_cnt-1].iov_base = &ctx->net_copied[ctx->net_copied_size];\n"
+ "\tctx->net_copied[ctx->net_copied_size] = val;\n"
+ "\tctx->net_copied_size += 1;\n"
+ "\tctx->net_iov[ctx->net_iov_cnt-1].iov_len += 1;\n"
+ )
+ ret += c_macro(
+ "#define MARSHAL_U16LE(ctx, val)\n"
+ "\tif (!ctx->net_iov[ctx->net_iov_cnt-1].iov_base)\n"
+ "\t\tctx->net_iov[ctx->net_iov_cnt-1].iov_base = &ctx->net_copied[ctx->net_copied_size];\n"
+ "\tuint16le_encode(&ctx->net_copied[ctx->net_copied_size], val);\n"
+ "\tctx->net_copied_size += 2;\n"
+ "\tctx->net_iov[ctx->net_iov_cnt-1].iov_len += 2;\n"
+ )
+ ret += c_macro(
+ "#define MARSHAL_U32LE(ctx, val)\n"
+ "\tif (!ctx->net_iov[ctx->net_iov_cnt-1].iov_base)\n"
+ "\t\tctx->net_iov[ctx->net_iov_cnt-1].iov_base = &ctx->net_copied[ctx->net_copied_size];\n"
+ "\tuint32le_encode(&ctx->net_copied[ctx->net_copied_size], val);\n"
+ "\tctx->net_copied_size += 4;\n"
+ "\tctx->net_iov[ctx->net_iov_cnt-1].iov_len += 4;\n"
+ )
+ ret += c_macro(
+ "#define MARSHAL_U64LE(ctx, val)\n"
+ "\tif (!ctx->net_iov[ctx->net_iov_cnt-1].iov_base)\n"
+ "\t\tctx->net_iov[ctx->net_iov_cnt-1].iov_base = &ctx->net_copied[ctx->net_copied_size];\n"
+ "\tuint64le_encode(&ctx->net_copied[ctx->net_copied_size], val);\n"
+ "\tctx->net_copied_size += 8;\n"
+ "\tctx->net_iov[ctx->net_iov_cnt-1].iov_len += 8;\n"
+ )
-LM_ALWAYS_INLINE static bool marshal_1(struct _marshal_ctx *ctx, uint8_t *val) {
-\tif (ctx->net_offset + 1 > ctx->ctx->max_msg_size)
-\t\treturn _marshal_too_large(ctx);
-\tctx->net_bytes[ctx->net_offset] = *val;
-\tctx->net_offset += 1;
-\treturn false;
-}
+ class OffsetExpr:
+ static: int
+ cond: dict[frozenset[str], "OffsetExpr"]
+ rep: list[tuple[Path, "OffsetExpr"]]
+
+ def __init__(self) -> None:
+ self.static = 0
+ self.rep = []
+ self.cond = {}
+
+ def add(self, other: "OffsetExpr") -> None:
+ self.static += other.static
+ self.rep += other.rep
+ for k, v in other.cond.items():
+ if k in self.cond:
+ self.cond[k].add(v)
+ else:
+ self.cond[k] = v
+
+ def gen_c(
+ self,
+ dsttyp: str,
+ dstvar: str,
+ root: str,
+ indent_depth: int,
+ loop_depth: int,
+ ) -> str:
+ oneline: list[str] = []
+ multiline = ""
+ if self.static:
+ oneline.append(str(self.static))
+ for cnt, sub in self.rep:
+ if not sub.cond and not sub.rep:
+ if sub.static == 1:
+ oneline.append(cnt.c_str(root))
+ else:
+ oneline.append(f"({cnt.c_str(root)})*{sub.static}")
+ continue
+ loopvar = chr(ord("i") + loop_depth)
+ multiline += f"{'\t'*indent_depth}for ({c_typename(cnt.elems[-1].typ)} {loopvar} = 0; {loopvar} < {cnt.c_str(root)}; {loopvar}++) {{\n"
+ multiline += sub.gen_c(
+ "", dstvar, root, indent_depth + 1, loop_depth + 1
+ )
+ multiline += f"{'\t'*indent_depth}}}\n"
+ for vers, sub in self.cond.items():
+ multiline += ifdef_push(indent_depth + 1, c_ver_ifdef(vers))
+ multiline += f"{'\t'*indent_depth}if {c_ver_cond(vers)} {{\n"
+ multiline += sub.gen_c("", dstvar, root, indent_depth + 1, loop_depth)
+ multiline += f"{'\t'*indent_depth}}}\n"
+ multiline += ifdef_pop(indent_depth)
+ if dsttyp:
+ if not oneline:
+ oneline.append("0")
+ ret = f"{'\t'*indent_depth}{dsttyp} {dstvar} = {' + '.join(oneline)};\n"
+ elif oneline:
+ ret = f"{'\t'*indent_depth}{dstvar} += {' + '.join(oneline)};\n"
+ ret += multiline
+ return ret
-LM_ALWAYS_INLINE static bool marshal_2(struct _marshal_ctx *ctx, uint16_t *val) {
-\tif (ctx->net_offset + 2 > ctx->ctx->max_msg_size)
-\t\treturn _marshal_too_large(ctx);
-\tuint16le_encode(&ctx->net_bytes[ctx->net_offset], *val);
-\tctx->net_offset += 2;
-\treturn false;
-}
+ type OffsetExprRecursion = typing.Callable[[Path], WalkCmd]
-LM_ALWAYS_INLINE static bool marshal_4(struct _marshal_ctx *ctx, uint32_t *val) {
-\tif (ctx->net_offset + 4 > ctx->ctx->max_msg_size)
-\t\treturn true;
-\tuint32le_encode(&ctx->net_bytes[ctx->net_offset], *val);
-\tctx->net_offset += 4;
-\treturn false;
-}
+ def get_offset_expr(typ: idl.Type, recurse: OffsetExprRecursion) -> OffsetExpr:
+ if not isinstance(typ, idl.Struct):
+ assert typ.static_size
+ ret = OffsetExpr()
+ ret.static = typ.static_size
+ return ret
-LM_ALWAYS_INLINE static bool marshal_8(struct _marshal_ctx *ctx, uint64_t *val) {
-\tif (ctx->net_offset + 8 > ctx->ctx->max_msg_size)
-\t\treturn true;
-\tuint64le_encode(&ctx->net_bytes[ctx->net_offset], *val);
-\tctx->net_offset += 8;
-\treturn false;
-}
-"""
- for typ in topo_sorted(typs):
- inline = "LM_FLATTEN" if isinstance(typ, idl.Message) else "LM_ALWAYS_INLINE"
- argfn = unused if (isinstance(typ, idl.Struct) and not typ.members) else used
+ stack: list[tuple[Path, OffsetExpr, typing.Callable[[], None]]]
+
+ def pop_root() -> None:
+ assert False
+
+ def pop_cond() -> None:
+ nonlocal stack
+ key = frozenset(stack[-1][0].elems[-1].in_versions)
+ if key in stack[-2][1].cond:
+ stack[-2][1].cond[key].add(stack[-1][1])
+ else:
+ stack[-2][1].cond[key] = stack[-1][1]
+ stack = stack[:-1]
+
+ def pop_rep() -> None:
+ nonlocal stack
+ member_path = stack[-1][0]
+ member = member_path.elems[-1]
+ assert member.cnt
+ cnt_path = member_path.parent().add(member.cnt)
+ stack[-2][1].rep.append((cnt_path, stack[-1][1]))
+ stack = stack[:-1]
+
+ def handle(path: Path) -> tuple[WalkCmd, typing.Callable[[], None] | None]:
+ nonlocal recurse
+
+ ret = recurse(path)
+ if ret != WalkCmd.KEEP_GOING:
+ return ret, None
+
+ nonlocal stack
+ stack_len = len(stack)
+
+ def pop() -> None:
+ nonlocal stack
+ nonlocal stack_len
+ while len(stack) > stack_len:
+ stack[-1][2]()
+
+ if path.elems:
+ child = path.elems[-1]
+ parent = path.elems[-2].typ if len(path.elems) > 1 else path.root
+ if child.in_versions < parent.in_versions:
+ stack.append((path, OffsetExpr(), pop_cond))
+ if child.cnt:
+ stack.append((path, OffsetExpr(), pop_rep))
+ if not isinstance(child.typ, idl.Struct):
+ assert child.typ.static_size
+ stack[-1][1].static += child.typ.static_size
+ return ret, pop
+
+ stack = [(Path(typ), OffsetExpr(), pop_root)]
+ walk(typ, handle)
+ return stack[0][1]
+
+ def go_to_end(path: Path) -> WalkCmd:
+ return WalkCmd.KEEP_GOING
+
+ def go_to_tok(name: str) -> typing.Callable[[Path], WalkCmd]:
+ def ret(path: Path) -> WalkCmd:
+ if len(path.elems) == 1 and path.elems[0].name == name:
+ return WalkCmd.ABORT
+ return WalkCmd.KEEP_GOING
+
+ return ret
+
+ for typ in typs:
+ if not (
+ isinstance(typ, idl.Message) or typ.name == "stat"
+ ): # SPECIAL (include stat)
+ continue
+ assert isinstance(typ, idl.Struct)
ret += "\n"
ret += ifdef_push(1, c_ver_ifdef(typ.in_versions))
- ret += f"{inline} static bool marshal_{typ.name}(struct _marshal_ctx *{argfn('ctx')}, {c_typename(typ)} *{argfn('val')}) {{\n"
- match typ:
- case idl.Number():
- ret += f"\treturn marshal_{typ.prim.name}(ctx, ({c_typename(typ.prim)} *)val);\n"
- case idl.Bitfield():
- ret += f"\t{c_typename(typ)} masked_val = *val & {typ.name}_masks[ctx->ctx->version];\n"
- ret += f"\treturn marshal_{typ.prim.name}(ctx, ({c_typename(typ.prim)} *)&masked_val);\n"
- case idl.Struct():
- if len(typ.members) == 0:
- ret += "\treturn false;\n"
- ret += "}\n"
- continue
+ ret += f"static bool marshal_{typ.name}(struct _marshal_ctx *ctx, {c_typename(typ)} *val) {{\n"
- # Pass 1 - declare offset variables
- mark_offset = set()
- for member in typ.members:
- if member.val:
- if member.name not in mark_offset:
- ret += f"\tuint32_t _{member.name}_offset;\n"
- mark_offset.add(member.name)
- for tok in member.val.tokens:
- if isinstance(tok, idl.ExprSym) and tok.name.startswith("&"):
- if tok.name[1:] not in mark_offset:
- ret += f"\tuint32_t _{tok.name[1:]}_offset;\n"
- mark_offset.add(tok.name[1:])
+ # Pass 1 - check size
+ max_size = max(typ.max_size(v) for v in typ.in_versions)
- # Pass 2 - main pass
- ret += "\treturn false\n"
- for member in typ.members:
- ret += ifdef_push(2, c_ver_ifdef(member.in_versions))
- ret += "\t || "
- if member.in_versions != typ.in_versions:
- ret += "( " + c_ver_cond(member.in_versions) + " && "
- if member.name in mark_offset:
- ret += f"({{ _{member.name}_offset = ctx->net_offset; "
- if member.cnt:
- ret += "({ bool err = false;\n"
- ret += f"\t for (typeof(val->{member.cnt.name}) i = 0; i < val->{member.cnt.name} && !err; i++)\n"
- ret += "\t \terr = "
- if member.typ.static_size == 1: # SPECIAL (string)
- # Special-case is that we cast from `char` to `uint8_t`.
- ret += f"marshal_{member.typ.name}(ctx, (uint8_t *)&val->{member.name}[i]);\n"
- else:
- ret += f"marshal_{member.typ.name}(ctx, &val->{member.name}[i]);\n"
- ret += f"\t err; }})"
- elif member.val:
- # Just increment net_offset, don't actually marshal anything (yet).
- assert member.static_size
- ret += (
- f"({{ ctx->net_offset += {member.static_size}; false; }})"
- )
+ if max_size > u32max: # SPECIAL (9P2000.e)
+ ret += get_offset_expr(typ, go_to_end).gen_c(
+ "uint64_t", "needed_size", "val->", 1, 0
+ )
+ ret += "\tif (needed_size > (uint64_t)(ctx->ctx->max_msg_size)) {\n"
+ else:
+ ret += get_offset_expr(typ, go_to_end).gen_c(
+ "uint32_t", "needed_size", "val->", 1, 0
+ )
+ ret += "\tif (needed_size > ctx->ctx->max_msg_size) {\n"
+ if isinstance(typ, idl.Message): # SPECIAL (disable for stat)
+ ret += f'\t\tlib9p_errorf(ctx->ctx, LINUX_ERANGE, "%s message too large to marshal into %s limit (limit=%PRIu32)",\n'
+ ret += f'\t\t\t"{typ.name}",\n'
+ ret += f'\t\t\tctx->ctx->version ? "negotiated" : "{'client' if typ.msgid % 2 == 0 else 'server'}",\n'
+ ret += "\t\t\tctx->ctx->max_msg_size);\n"
+ ret += "\t\treturn true;\n"
+ ret += "\t}\n"
+
+ # Pass 2 - write data
+ ifdef_depth = 1
+ stack: list[tuple[Path, bool]] = [(Path(typ), False)]
+
+ def handle(path: Path) -> tuple[WalkCmd, typing.Callable[[], None]]:
+ nonlocal ret
+ nonlocal ifdef_depth
+ nonlocal stack
+ stack_len = len(stack)
+
+ def pop() -> None:
+ nonlocal ret
+ nonlocal ifdef_depth
+ nonlocal stack
+ nonlocal stack_len
+ while len(stack) > stack_len:
+ ret += f"{'\t'*(len(stack)-1)}}}\n"
+ if stack[-1][1]:
+ ifdef_depth -= 1
+ ret += ifdef_pop(ifdef_depth)
+ stack = stack[:-1]
+
+ loopdepth = sum(1 for elem in path.elems if elem.cnt)
+ struct = path.elems[-1].typ if path.elems else path.root
+ if isinstance(struct, idl.Struct):
+ offsets: list[str] = []
+ for member in struct.members:
+ if not member.val:
+ continue
+ for tok in member.val.tokens:
+ if not isinstance(tok, idl.ExprSym):
+ continue
+ if tok.name == "end" or tok.name.startswith("&"):
+ if tok.name not in offsets:
+ offsets.append(tok.name)
+ for name in offsets:
+ name_prefix = "offsetof_" + "".join(
+ m.name + "_" for m in path.elems
+ )
+ if name == "end":
+ if not path.elems:
+ nonlocal max_size
+ if max_size > u32max:
+ ret += f"{'\t'*len(stack)}uint32_t {name_prefix}end = (uint32_t)needed_size;\n"
+ else:
+ ret += f"{'\t'*len(stack)}uint32_t {name_prefix}end = needed_size;\n"
+ continue
+ recurse: OffsetExprRecursion = go_to_end
else:
- ret += f"marshal_{member.typ.name}(ctx, &val->{member.name})"
- if member.name in mark_offset:
- ret += "; })"
- if member.in_versions != typ.in_versions:
- ret += " )"
- ret += "\n"
-
- # Pass 3 - marshal ,val= members
- for member in typ.members:
- if member.val:
- assert member.static_size
- ret += ifdef_push(2, c_ver_ifdef(member.in_versions))
+ assert name.startswith("&")
+ name = name[1:]
+ recurse = go_to_tok(name)
+ expr = get_offset_expr(struct, recurse)
+ expr_prefix = path.c_str("val->", loopdepth)
+ if not expr_prefix.endswith(">"):
+ expr_prefix += "."
+ ret += expr.gen_c(
+ "uint32_t",
+ name_prefix + name,
+ expr_prefix,
+ len(stack),
+ loopdepth,
+ )
+ if path.elems:
+ child = path.elems[-1]
+ parent = path.elems[-2].typ if len(path.elems) > 1 else path.root
+ if child.in_versions < parent.in_versions:
+ ret += ifdef_push(ifdef_depth + 1, c_ver_ifdef(child.in_versions))
+ ifdef_depth += 1
+ ret += f"{'\t'*len(stack)}if ({c_ver_cond(child.in_versions)}) {{\n"
+ stack.append((path, True))
+ if child.cnt:
+ cnt_path = path.parent().add(child.cnt)
+ if child.typ.static_size == 1: # SPECIAL (zerocopy)
+ if path.root.name == "stat": # SPECIAL (stat)
+ ret += f"{'\t'*len(stack)}MARSHAL_BYTES(ctx, {path.c_str('val->')[:-3]}, {cnt_path.c_str('val->')});\n"
+ else:
+ ret += f"{'\t'*len(stack)}MARSHAL_BYTES_ZEROCOPY(ctx, {path.c_str('val->')[:-3]}, {cnt_path.c_str('val->')});\n"
+ return WalkCmd.KEEP_GOING, pop
+ loopvar = chr(ord("i") + loopdepth - 1)
+ ret += f"{'\t'*len(stack)}for ({c_typename(child.cnt.typ)} {loopvar} = 0; {loopvar} < {cnt_path.c_str('val->')}; {loopvar}++) {{\n"
+ stack.append((path, False))
+ if not isinstance(child.typ, idl.Struct):
+ if child.val:
def lookup_sym(sym: str) -> str:
- match sym:
- case "end":
- return "ctx->net_offset"
- case _:
- assert sym.startswith("&")
- return f"_{sym[1:]}_offset"
-
- if member.static_size == 1:
- ret += f"\t || ({{ ctx->net_bytes[_{member.name}_offset] = {c_expr(member.val, lookup_sym)}; false; }})\n"
- else:
- ret += f"\t || ({{ uint{member.static_size*8}le_encode(&ctx->net_bytes[_{member.name}_offset], {c_expr(member.val, lookup_sym)}); false; }})\n"
+ nonlocal path
+ if sym.startswith("&"):
+ sym = sym[1:]
+ return (
+ "offsetof_"
+ + "".join(m.name + "_" for m in path.elems[:-1])
+ + sym
+ )
+
+ val = c_expr(child.val, lookup_sym)
+ else:
+ val = path.c_str("val->")
+ if isinstance(child.typ, idl.Bitfield):
+ val += f" & {child.typ.name}_masks[ctx->ctx->version]"
+ ret += f"{'\t'*len(stack)}MARSHAL_U{child.typ.static_size*8}LE(ctx, {val});\n"
+ return WalkCmd.KEEP_GOING, pop
- ret += ifdef_pop(1)
- ret += "\t ;\n"
+ walk(typ, handle)
+
+ ret += "\treturn false;\n"
ret += "}\n"
ret += ifdef_pop(0)
# function tables ##########################################################
ret += """
/* function tables ************************************************************/
-
"""
+
+ ret += "\n"
+ ret += f"const uint32_t _{idprefix}table_msg_min_size[{c_ver_enum('NUM')}] = {{\n"
+ rerror = next(typ for typ in typs if typ.name == "Rerror")
+ ret += f"\t[{c_ver_enum('unknown')}] = {rerror.min_size('9P2000')},\n" # SPECIAL (initialization)
+ for ver in sorted(versions):
+ ret += ifdef_push(1, c_ver_ifdef({ver}))
+ ret += f"\t[{c_ver_enum(ver)}] = {rerror.min_size(ver)},\n"
+ ret += ifdef_pop(0)
+ ret += "};\n"
+
+ ret += "\n"
ret += c_macro(
f"#define _MSG_RECV(typ) [{idprefix.upper()}TYP_##typ/2] = {{\n"
f"\t\t.basesize = sizeof(struct {idprefix}msg_##typ),\n"
generated by cgit v1.2.3-2-g168b (git 2.25.1) at 2025-03-16 03:54:05 +0000