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-rw-r--r--xC-gen-proto-c.awk324
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-# xC-gen-proto-c.awk: C backend for xC-gen-proto.awk.
-#
-# Copyright (c) 2022, Přemysl Eric Janouch <p@janouch.name>
-# SPDX-License-Identifier: 0BSD
-#
-# Neither *_new() nor *_destroy() functions are provided, because they'd only
-# be useful for top-levels, and are merely extra malloc()/free() calls.
-# Users are expected to reuse buffers.
-#
-# Similarly, no constructors are produced--those are easy to write manually.
-#
-# All arrays are deserialized zero-terminated, so u8<> and i8<> can be directly
-# used as C strings.
-#
-# All types must be able to dispose partially zero values going from the back,
-# i.e., in the reverse order of deserialization.
-
-function define_internal(name, ctype) {
- Types[name] = "internal"
- CodegenCType[name] = ctype
-}
-
-function define_int(shortname, ctype) {
- define_internal(shortname, ctype)
- CodegenSerialize[shortname] = \
- "\tstr_pack_" shortname "(w, %s);\n"
- CodegenDeserialize[shortname] = \
- "\tif (!msg_unpacker_" shortname "(r, &%s))\n" \
- "\t\treturn false;\n"
-}
-
-function define_sint(size) { define_int("i" size, "int" size "_t") }
-function define_uint(size) { define_int("u" size, "uint" size "_t") }
-
-function codegen_begin() {
- define_sint("8")
- define_sint("16")
- define_sint("32")
- define_sint("64")
- define_uint("8")
- define_uint("16")
- define_uint("32")
- define_uint("64")
-
- define_internal("string", "struct str")
- CodegenDispose["string"] = "\tstr_free(&%s);\n"
- CodegenSerialize["string"] = \
- "\tif (!proto_string_serialize(&%s, w))\n" \
- "\t\treturn false;\n"
- CodegenDeserialize["string"] = \
- "\tif (!proto_string_deserialize(&%s, r))\n" \
- "\t\treturn false;\n"
-
- define_internal("bool", "bool")
- CodegenSerialize["bool"] = \
- "\tstr_pack_u8(w, !!%s);\n"
- CodegenDeserialize["bool"] = \
- "\t{\n" \
- "\t\tuint8_t v = 0;\n" \
- "\t\tif (!msg_unpacker_u8(r, &v))\n" \
- "\t\t\treturn false;\n" \
- "\t\t%s = !!v;\n" \
- "\t}\n"
-
- print "// Code generated from " FILENAME ". DO NOT EDIT."
- print "// This file directly depends on liberty.c, but doesn't include it."
- print ""
- print "static bool"
- print "proto_string_serialize(const struct str *s, struct str *w) {"
- print "\tif (s->len > UINT32_MAX)"
- print "\t\treturn false;"
- print "\tstr_pack_u32(w, s->len);"
- print "\tstr_append_str(w, s);"
- print "\treturn true;"
- print "}"
- print ""
- print "static bool"
- print "proto_string_deserialize(struct str *s, struct msg_unpacker *r) {"
- print "\tuint32_t len = 0;"
- print "\tif (!msg_unpacker_u32(r, &len))"
- print "\t\treturn false;"
- print "\tif (msg_unpacker_get_available(r) < len)"
- print "\t\treturn false;"
- print "\t*s = str_make();"
- print "\tstr_append_data(s, r->data + r->offset, len);"
- print "\tr->offset += len;"
- print "\tif (!utf8_validate (s->str, s->len))"
- print "\t\treturn false;"
- print "\treturn true;"
- print "}"
-}
-
-function codegen_constant(name, value) {
- print ""
- print "enum { " PrefixUpper name " = " value " };"
-}
-
-function codegen_enum_value(name, subname, value, cg) {
- append(cg, "fields",
- "\t" PrefixUpper toupper(cameltosnake(name)) "_" subname \
- " = " value ",\n")
-}
-
-function codegen_enum(name, cg, ctype) {
- ctype = "enum " PrefixLower cameltosnake(name)
- print ""
- print ctype " {"
- print cg["fields"] "};"
-
- # XXX: This should also check if it isn't out-of-range for any reason,
- # but our usage of sprintf() stands in the way a bit.
- CodegenSerialize[name] = "\tstr_pack_i8(w, %s);\n"
- CodegenDeserialize[name] = \
- "\t{\n" \
- "\t\tint8_t v = 0;\n" \
- "\t\tif (!msg_unpacker_i8(r, &v) || !v)\n" \
- "\t\t\treturn false;\n" \
- "\t\t%s = v;\n" \
- "\t}\n"
-
- CodegenCType[name] = ctype
- for (i in cg)
- delete cg[i]
-}
-
-function codegen_struct_tag(d, cg, f) {
- f = "self->" d["name"]
- append(cg, "fields", "\t" CodegenCType[d["type"]] " " d["name"] ";\n")
- append(cg, "dispose", sprintf(CodegenDispose[d["type"]], f))
- append(cg, "serialize", sprintf(CodegenSerialize[d["type"]], f))
- # Do not deserialize here, that would be out of order.
-}
-
-function codegen_struct_field(d, cg, f, dispose, serialize, deserialize) {
- f = "self->" d["name"]
- dispose = CodegenDispose[d["type"]]
- serialize = CodegenSerialize[d["type"]]
- deserialize = CodegenDeserialize[d["type"]]
- if (!d["isarray"]) {
- append(cg, "fields", "\t" CodegenCType[d["type"]] " " d["name"] ";\n")
- append(cg, "dispose", sprintf(dispose, f))
- append(cg, "serialize", sprintf(serialize, f))
- append(cg, "deserialize", sprintf(deserialize, f))
- return
- }
-
- append(cg, "fields",
- "\t" CodegenCType["u32"] " " d["name"] "_len;\n" \
- "\t" CodegenCType[d["type"]] " *" d["name"] ";\n")
-
- if (dispose)
- append(cg, "dispose", "\tif (" f ")\n" \
- "\t\tfor (size_t i = 0; i < " f "_len; i++)\n" \
- indent(indent(sprintf(dispose, f "[i]"))))
- append(cg, "dispose", "\tfree(" f ");\n")
-
- append(cg, "serialize", sprintf(CodegenSerialize["u32"], f "_len"))
- if (d["type"] == "u8" || d["type"] == "i8") {
- append(cg, "serialize",
- "\tstr_append_data(w, " f ", " f "_len);\n")
- } else if (serialize) {
- append(cg, "serialize",
- "\tfor (size_t i = 0; i < " f "_len; i++)\n" \
- indent(sprintf(serialize, f "[i]")))
- }
-
- append(cg, "deserialize", sprintf(CodegenDeserialize["u32"], f "_len") \
- "\tif (!(" f " = calloc(" f "_len + 1, sizeof *" f ")))\n" \
- "\t\treturn false;\n")
- if (d["type"] == "u8" || d["type"] == "i8") {
- append(cg, "deserialize",
- "\tif (msg_unpacker_get_available(r) < " f "_len)\n" \
- "\t\treturn false;\n" \
- "\tmemcpy(" f ", r->data + r->offset, " f "_len);\n" \
- "\tr->offset += " f "_len;\n")
- } else if (deserialize) {
- append(cg, "deserialize",
- "\tfor (size_t i = 0; i < " f "_len; i++)\n" \
- indent(sprintf(deserialize, f "[i]")))
- }
-}
-
-function codegen_struct(name, cg, ctype, funcname) {
- ctype = "struct " PrefixLower cameltosnake(name)
- print ""
- print ctype " {"
- print cg["fields"] "};"
-
- if (cg["dispose"]) {
- funcname = PrefixLower cameltosnake(name) "_free"
- print ""
- print "static void\n" funcname "(" ctype " *self) {"
- print cg["dispose"] "}"
-
- CodegenDispose[name] = "\t" funcname "(&%s);\n"
- }
- if (cg["serialize"]) {
- funcname = PrefixLower cameltosnake(name) "_serialize"
- print ""
- print "static bool\n" \
- funcname "(\n\t\t" ctype " *self, struct str *w) {"
- print cg["serialize"] "\treturn true;"
- print "}"
-
- CodegenSerialize[name] = "\tif (!" funcname "(&%s, w))\n" \
- "\t\treturn false;\n"
- }
- if (cg["deserialize"]) {
- funcname = PrefixLower cameltosnake(name) "_deserialize"
- print ""
- print "static bool\n" \
- funcname "(\n\t\t" ctype " *self, struct msg_unpacker *r) {"
- print cg["deserialize"] "\treturn true;"
- print "}"
-
- CodegenDeserialize[name] = "\tif (!" funcname "(&%s, r))\n" \
- "\t\treturn false;\n"
- }
-
- CodegenCType[name] = ctype
- for (i in cg)
- delete cg[i]
-}
-
-function codegen_union_tag(d, cg) {
- cg["tagtype"] = d["type"]
- cg["tagname"] = d["name"]
- append(cg, "fields", "\t" CodegenCType[d["type"]] " " d["name"] ";\n")
-}
-
-function codegen_union_struct( \
- name, casename, cg, scg, structname, fieldname, fullcasename) {
- # Don't generate obviously useless structs.
- fullcasename = toupper(cameltosnake(cg["tagtype"])) "_" casename
- if (!scg["dispose"] && !scg["deserialize"]) {
- append(cg, "structless", "\tcase " PrefixUpper fullcasename ":\n")
- for (i in scg)
- delete scg[i]
- return
- }
-
- # And thus not all generated structs are present in Types.
- structname = name "_" casename
- fieldname = tolower(casename)
- codegen_struct(structname, scg)
-
- append(cg, "fields", "\t" CodegenCType[structname] " " fieldname ";\n")
- if (CodegenDispose[structname])
- append(cg, "dispose", "\tcase " PrefixUpper fullcasename ":\n" \
- indent(sprintf(CodegenDispose[structname], "self->" fieldname)) \
- "\t\tbreak;\n")
-
- # With no de/serialization code, this will simply recognize the tag.
- append(cg, "serialize", "\tcase " PrefixUpper fullcasename ":\n" \
- indent(sprintf(CodegenSerialize[structname], "self->" fieldname)) \
- "\t\tbreak;\n")
- append(cg, "deserialize", "\tcase " PrefixUpper fullcasename ":\n" \
- indent(sprintf(CodegenDeserialize[structname], "self->" fieldname)) \
- "\t\tbreak;\n")
-}
-
-function codegen_union(name, cg, f, ctype, funcname) {
- ctype = "union " PrefixLower cameltosnake(name)
- print ""
- print ctype " {"
- print cg["fields"] "};"
-
- f = "self->" cg["tagname"]
- if (cg["dispose"]) {
- funcname = PrefixLower cameltosnake(name) "_free"
- print ""
- print "static void\n" funcname "(" ctype " *self) {"
- print "\tswitch (" f ") {"
- if (cg["structless"])
- print cg["structless"] \
- indent(sprintf(CodegenDispose[cg["tagtype"]], f)) "\t\tbreak;"
- print cg["dispose"] "\tdefault:"
- print "\t\tbreak;"
- print "\t}"
- print "}"
-
- CodegenDispose[name] = "\t" funcname "(&%s);\n"
- }
- if (cg["serialize"]) {
- funcname = PrefixLower cameltosnake(name) "_serialize"
- print ""
- print "static bool\n" \
- funcname "(\n\t\t" ctype " *self, struct str *w) {"
- print "\tswitch (" f ") {"
- if (cg["structless"])
- print cg["structless"] \
- indent(sprintf(CodegenSerialize[cg["tagtype"]], f)) "\t\tbreak;"
- print cg["serialize"] "\tdefault:"
- print "\t\treturn false;"
- print "\t}"
- print "\treturn true;"
- print "}"
-
- CodegenSerialize[name] = "\tif (!" funcname "(&%s, w))\n" \
- "\t\treturn false;\n"
- }
- if (cg["deserialize"]) {
- funcname = PrefixLower cameltosnake(name) "_deserialize"
- print ""
- print "static bool\n" \
- funcname "(\n\t\t" ctype " *self, struct msg_unpacker *r) {"
- print sprintf(CodegenDeserialize[cg["tagtype"]], f)
- print "\tswitch (" f ") {"
- if (cg["structless"])
- print cg["structless"] "\t\tbreak;"
- print cg["deserialize"] "\tdefault:"
- print "\t\treturn false;"
- print "\t}"
- print "\treturn true;"
- print "}"
-
- CodegenDeserialize[name] = "\tif (!" funcname "(&%s, r))\n" \
- "\t\treturn false;\n"
- }
-
- CodegenCType[name] = ctype
- for (i in cg)
- delete cg[i]
-}