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Add a C++ backend for LibertyXDR

Browse Source 
Also change the C backend so that it also de/serializes
unions without any other fields besides the tag.
This commit is contained in:
Přemysl Eric Janouch 2023-07-07 12:25:14 +02:00
parent f78f8a70f1
commit 2edc9c6fd1
Signed by: p
GPG Key ID: A0420B94F92B9493
13 changed files with 638 additions and 12 deletions
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22
CMakeLists.txt
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@ -1,5 +1,5 @@
cmake_minimum_required (VERSION 2.8.12)
project (liberty C)
project (liberty C CXX)
# Moar warnings
if ("${CMAKE_C_COMPILER_ID}" MATCHES "GNU" OR CMAKE_COMPILER_IS_GNUCC)
@ -72,7 +72,7 @@ add_test (test-cmake-parser
# Test protocol code generation
set (lxdrgen_outputs)
set (lxdrgen_base "${PROJECT_BINARY_DIR}/lxdrgen.lxdr")
foreach (backend c go mjs swift)
foreach (backend c cpp go mjs swift)
list (APPEND lxdrgen_outputs ${lxdrgen_base}.${backend})
add_custom_command (OUTPUT ${lxdrgen_base}.${backend}
COMMAND env LC_ALL=C awk
@ -91,9 +91,21 @@ add_custom_target (test-lxdrgen-outputs ALL DEPENDS ${lxdrgen_outputs})
set_source_files_properties (${lxdrgen_base}.c
PROPERTIES HEADER_FILE_ONLY TRUE)
add_executable (test-lxdrgen tests/lxdrgen.c ${lxdrgen_base}.c)
target_include_directories (test-lxdrgen PUBLIC ${PROJECT_BINARY_DIR})
add_test (NAME test-lxdrgen-c COMMAND test-lxdrgen)
add_executable (test-lxdrgen-c tests/lxdrgen.c ${lxdrgen_base}.c)
target_include_directories (test-lxdrgen-c PUBLIC ${PROJECT_BINARY_DIR})
add_test (NAME test-lxdrgen-c COMMAND test-lxdrgen-c)
set_source_files_properties (${lxdrgen_base}.cpp
PROPERTIES HEADER_FILE_ONLY TRUE)
if (WIN32)
add_executable (test-lxdrgen-cpp tests/lxdrgen.cpp
${lxdrgen_base}.cpp tools/lxdrgen-cpp-win32.cpp)
else ()
add_executable (test-lxdrgen-cpp tests/lxdrgen.cpp
${lxdrgen_base}.cpp tools/lxdrgen-cpp-posix.cpp)
endif ()
target_include_directories (test-lxdrgen-cpp PUBLIC ${PROJECT_BINARY_DIR})
add_test (NAME test-lxdrgen-cpp COMMAND test-lxdrgen-cpp)
find_program (GO_EXECUTABLE go)
if (GO_EXECUTABLE)

6
README.adoc
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@ -44,6 +44,12 @@ lxdrgen.awk::
lxdrgen-c.awk::
LibertyXDR backend that builds on top of the C pseudolibrary.
lxdrgen-cpp.awk::
lxdrgen-cpp-win32.cpp::
lxdrgen-cpp-posix.cpp::
LibertyXDR backend for C++, primarily targeting Win32 and its wide strings.
Link the result together with one of the accompanied source files.
lxdrgen-go.awk::
LibertyXDR backend for Go, supporting _encoding/json_ interfaces. It also
produces optimized JSON marshallers (however, note that the _json.Marshaler_

11
tests/lxdrgen.c
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@ -53,6 +53,10 @@ test_ser_deser_free (void)
u->others.bar = str_make ();
for (int i = rand () % 0x30; i > 0; i--)
str_append_c (&u->others.bar, 0x30 + i);
u->others.baz_len = rand () % 0x30;
u->others.baz = xcalloc (1, u->others.baz_len);
for (uint32_t i = 0; i < u->others.baz_len; i++)
u->others.baz[i] = 0x30 + i;
break;
case 2:
u->tag = PROTO_GEN_ENUM_NOTHING;
@ -62,6 +66,8 @@ test_ser_deser_free (void)
}
}
a.o.tag = PROTO_GEN_ENUM_NOTHING;
struct str buf = str_make ();
hard_assert (proto_gen_struct_serialize (&a, &buf));
struct msg_unpacker r = msg_unpacker_make (buf.str, buf.len);
@ -92,6 +98,9 @@ test_ser_deser_free (void)
hard_assert (ua->others.bar.len == ub->others.bar.len);
hard_assert (!memcmp (ua->others.bar.str, ub->others.bar.str,
ua->others.bar.len));
hard_assert (ua->others.baz_len == ub->others.baz_len);
hard_assert (!memcmp (ua->others.baz, ub->others.baz,
ua->others.baz_len));
break;
case PROTO_GEN_ENUM_NOTHING:
break;
@ -100,6 +109,8 @@ test_ser_deser_free (void)
}
}
hard_assert (a.o.tag == b.o.tag);
// Emulate partially deserialized data to test disposal of that.
for (size_t i = b.u_len - CASES; i < b.u_len; i++)
{

132
tests/lxdrgen.cpp Normal file
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@ -0,0 +1,132 @@
/*
* tests/lxdrgen.cpp
*
* Copyright (c) 2023, Přemysl Eric Janouch <p@janouch.name>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "lxdrgen.lxdr.cpp"
#include <cstdlib>
static void
hard_assert (bool condition, const char *description)
{
if (!condition)
{
fprintf (stderr, "assertion failed: %s\n", description);
abort ();
}
}
#define hard_assert(condition) hard_assert (condition, #condition)
int
main (int argc, char *argv[])
{
hard_assert (ProtoGen::VERSION == 1);
enum { CASES = 3 };
ProtoGen::Struct a = {}, b = {};
a.u.resize (CASES + rand () % 100);
for (size_t i = 0; i < a.u.size (); i++)
{
std::unique_ptr<ProtoGen::Union> &u = a.u[i];
switch (i % CASES)
{
case 0:
{
auto numbers = new ProtoGen::Union_Numbers ();
numbers->a = rand () % UINT8_MAX;
numbers->b = rand () % UINT16_MAX;
numbers->c = rand () % UINT32_MAX;
numbers->d = rand () % UINT64_MAX;
numbers->e = rand () % UINT8_MAX;
numbers->f = rand () % UINT16_MAX;
numbers->g = rand () % UINT32_MAX;
numbers->h = rand () % UINT64_MAX;
u.reset (numbers);
break;
}
case 1:
{
auto others = new ProtoGen::Union_Others ();
others->foo = rand () % 2;
for (int i = rand () % 0x30; i > 0; i--)
others->bar += 0x30 + i;
for (int i = rand () % 0x30; i > 0; i--)
others->baz.push_back (0x30 + i);
u.reset (others);
break;
}
case 2:
u.reset (new ProtoGen::Union_Nothing ());
break;
default:
hard_assert (!"unhandled case");
}
}
a.o.reset (new ProtoGen::Onion_Nothing ());
LibertyXDR::Writer buf;
hard_assert (a.serialize (buf));
LibertyXDR::Reader r;
r.data = buf.data.data ();
r.length = buf.data.size ();
hard_assert (b.deserialize (r));
hard_assert (!r.length);
hard_assert (a.u.size () == b.u.size ());
for (size_t i = 0; i < a.u.size (); i++)
{
ProtoGen::Union *ua = a.u[i].get ();
ProtoGen::Union *ub = b.u[i].get ();
hard_assert (ua->tag == ub->tag);
switch (ua->tag)
{
case ProtoGen::Enum::NUMBERS:
{
auto a = dynamic_cast<ProtoGen::Union_Numbers *> (ua);
auto b = dynamic_cast<ProtoGen::Union_Numbers *> (ub);
hard_assert (a->a == b->a);
hard_assert (a->b == b->b);
hard_assert (a->c == b->c);
hard_assert (a->d == b->d);
hard_assert (a->e == b->e);
hard_assert (a->f == b->f);
hard_assert (a->g == b->g);
hard_assert (a->h == b->h);
break;
}
case ProtoGen::Enum::OTHERS:
{
auto a = dynamic_cast<ProtoGen::Union_Others *> (ua);
auto b = dynamic_cast<ProtoGen::Union_Others *> (ub);
hard_assert (a->foo == b->foo);
hard_assert (a->bar == b->bar);
hard_assert (a->baz == b->baz);
break;
}
case ProtoGen::Enum::NOTHING:
break;
default:
hard_assert (!"unexpected case");
}
}
hard_assert (a.o->tag == b.o->tag);
return 0;
}

1
tests/lxdrgen.lxdr
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@ -17,6 +17,7 @@ struct Struct {
case OTHERS:
bool foo;
string bar;
u8 baz<>;
case NOTHING:
void;
} u<>;

6
tools/lxdrgen-c.awk
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@ -222,7 +222,7 @@ function codegen_struct(name, cg, ctype, funcname) {
delete cg[i]
}
function codegen_union_tag(d, cg) {
function codegen_union_tag(name, d, cg) {
cg["tagtype"] = d["type"]
cg["tagname"] = d["name"]
append(cg, "fields", "\t" CodegenCType[d["type"]] " " d["name"] ";\n")
@ -281,7 +281,7 @@ function codegen_union(name, cg, exhaustive, f, ctype, funcname) {
CodegenDispose[name] = "\t" funcname "(&%s);\n"
}
if (cg["serialize"]) {
{
funcname = PrefixLower cameltosnake(name) "_serialize"
print ""
print "static bool\n" \
@ -299,7 +299,7 @@ function codegen_union(name, cg, exhaustive, f, ctype, funcname) {
CodegenSerialize[name] = "\tif (!" funcname "(&%s, w))\n" \
"\t\treturn false;\n"
}
if (cg["deserialize"]) {
{
funcname = PrefixLower cameltosnake(name) "_deserialize"
print ""
print "static bool\n" \

67
tools/lxdrgen-cpp-posix.cpp Normal file
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@ -0,0 +1,67 @@
// lxdrgen-cpp-posix.cpp: POSIX support code for lxdrgen-cpp.awk.
//
// Copyright (c) 2023, Přemysl Eric Janouch <p@janouch.name>
// SPDX-License-Identifier: 0BSD
#include <iconv.h>
#include <cstdint>
#include <string>
// Various BSD derivatives may have a problem here.
// Linux defines __STDC_ISO_10646__, but also supports "WCHAR_T".
#ifdef APPLE
#define ICONV_WCHAR "UTF-32"
#else
#define ICONV_WCHAR "WCHAR_T"
#endif
namespace LibertyXDR {
bool utf8_to_wstring(const uint8_t *utf8, size_t length, std::wstring &wide) {
iconv_t conv = iconv_open(ICONV_WCHAR, "UTF-8");
if (conv == (iconv_t) -1)
return false;
wchar_t buffer[1024] = {};
char *start = (char *) buffer, *out = start, *in = (char *) utf8;
size_t available = sizeof buffer;
wide.clear();
while (iconv(conv, &in, &length, &out, &available) == (size_t) -1) {
if (errno != E2BIG) {
iconv_close(conv);
return false;
}
wide.append(buffer, (out - start) / sizeof *buffer);
out = start;
available = sizeof buffer;
}
wide.append(buffer, (out - start) / sizeof *buffer);
iconv_close(conv);
return true;
}
bool wstring_to_utf8(const std::wstring &wide, std::string &utf8) {
iconv_t conv = iconv_open("UTF-8", ICONV_WCHAR);
if (conv == (iconv_t) -1)
return false;
char buffer[1024] = {}, *out = buffer, *in = (char *) wide.data();
size_t available = sizeof buffer, length = wide.size() * sizeof wide[0];
utf8.clear();
while (iconv(conv, &in, &length, &out, &available) == (size_t) -1) {
if (errno != E2BIG) {
iconv_close(conv);
return false;
}
utf8.append(buffer, out - buffer);
out = buffer;
available = sizeof buffer;
}
utf8.append(buffer, out - buffer);
iconv_close(conv);
return true;
}
} // namespace LibertyXDR

47
tools/lxdrgen-cpp-win32.cpp Normal file
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@ -0,0 +1,47 @@
// lxdrgen-cpp-win32.cpp: Win32 support code for lxdrgen-cpp.awk.
//
// Copyright (c) 2023, Přemysl Eric Janouch <p@janouch.name>
// SPDX-License-Identifier: 0BSD
#include <windows.h>
#include <climits>
#include <cstdint>
#include <string>
namespace LibertyXDR {
bool utf8_to_wstring(const uint8_t *utf8, size_t length, std::wstring &wide) {
wide.clear();
if (!length)
return true;
if (length > INT_MAX)
return false;
int size = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
(LPCCH) utf8, length, nullptr, 0);
if (size <= 0)
return false;
wide.resize(size);
return !MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
(LPCCH) utf8, length, wide.data(), size);
}
bool wstring_to_utf8(const std::wstring &wide, std::string &utf8) {
utf8.clear();
if (wide.empty())
return true;
if (wide.size() > INT_MAX)
return false;
int size = WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS,
(LPCWCH) wide.data(), wide.size(), nullptr, 0, NULL, NULL);
if (size <= 0)
return false;
utf8.resize(size);
return !WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS,
(LPCWCH) wide.data(), wide.size(), utf8.data(), size, NULL, NULL);
}
} // namespace LibertyXDR

350
tools/lxdrgen-cpp.awk Normal file
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@ -0,0 +1,350 @@
# lxdrgen-cpp.awk: C++ backend for lxdrgen.awk.
#
# This backend is intended for Windows, it just happens to have a fallback
# that will probably work on Unices, of which we make use in tests.
#
# Copyright (c) 2023, Přemysl Eric Janouch <p@janouch.name>
# SPDX-License-Identifier: 0BSD
function define_internal(name, ctype) {
Types[name] = "internal"
CodegenCType[name] = ctype
CodegenSerialize[name] = \
"\tw.append(%s);\n"
CodegenDeserialize[name] = \
"\tif (!r.read(%s))\n" \
"\t\treturn false;\n"
}
function define_int(shortname, ctype) {
define_internal(shortname, ctype)
}
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", "std::wstring")
define_internal("bool", "bool")
CodegenSerialize["string"] = \
"\tif (!w.append(%s))\n" \
"\t\treturn false;\n"
print "// Code generated from " FILENAME ". DO NOT EDIT."
print ""
print "#include <cstdint>"
print "#include <memory>"
print "#include <string>"
print "#include <vector>"
print ""
print "namespace LibertyXDR {"
print ""
print "bool utf8_to_wstring("
print "\tconst uint8_t *utf8, size_t length, std::wstring &wide);"
print "bool wstring_to_utf8("
print "\tconst std::wstring &wide, std::string &utf8);"
print ""
print "struct Reader {"
print "\tconst uint8_t *data = {};"
print "\tsize_t length = {};"
print ""
print "\ttemplate<typename T> bool read(T &number) {"
print "\t\tif (length < sizeof number)"
print "\t\t\treturn false;"
print ""
print "\t\tnumber = 0;"
print "\t\tfor (size_t i = 0; i < sizeof number; i++) {"
print "\t\t\tnumber = number << 8 | *data++;"
print "\t\t\tlength--;"
print "\t\t}"
print "\t\treturn true;"
print "\t}"
print ""
print "\tbool read(bool &boolean) {"
print "\t\tuint8_t number = 0;"
print "\t\tif (!read(number))"
print "\t\t\treturn false;"
print ""
print "\t\tboolean = number != 0;"
print "\t\treturn true;"
print "\t}"
print ""
print "\tbool read(std::wstring &string) {"
print "\t\tuint32_t size = 0;"
print "\t\tif (!read(size) || size > length)"
print "\t\t\treturn false;"
print "\t\tif (!utf8_to_wstring(data, size, string))"
print "\t\t\treturn false;"
print ""
print "\t\tdata += size;"
print "\t\tlength -= size;"
print "\t\treturn true;"
print "\t}"
print ""
print "\tbool read(std::vector<uint8_t> &vector) {"
print "\t\tuint32_t size = 0;"
print "\t\tif (!read(size) || size > length)"
print "\t\t\treturn false;"
print "\t\tvector.assign(data, data + size);"
print ""
print "\t\tdata += size;"
print "\t\tlength -= size;"
print "\t\treturn true;"
print "\t}"
print "};"
print ""
print "struct Writer {"
print "\tstd::vector<uint8_t> data;"
print ""
print "\ttemplate<typename T> bool append(T number) {"
print "\t\tuint8_t buffer[sizeof number], *p = buffer + sizeof buffer;"
print "\t\twhile (p != buffer) {"
print "\t\t\t*--p = number;"
print "\t\t\tnumber >>= 8;"
print "\t\t}"
print "\t\tdata.insert(data.end(), buffer, buffer + sizeof buffer);"
print "\t\treturn true;"
print "\t}"
print ""
print "\tbool append(int8_t number) {"
print "\t\tdata.push_back(number);"
print "\t\treturn true;"
print "\t}"
print ""
print "\tbool append(uint8_t number) {"
print "\t\tdata.push_back(number);"
print "\t\treturn true;"
print "\t}"
print ""
print "\tbool append(bool boolean) {"
print "\t\treturn append(uint8_t(boolean));"
print "\t}"
print ""
print "\tbool append(const std::wstring &string) {"
print "\t\tif (string.size() > UINT32_MAX)"
print "\t\t\treturn false;"
print ""
print "\t\tstd::string utf8;"
print "\t\tif (!wstring_to_utf8(string, utf8))"
print "\t\t\treturn false;"
print ""
print "\t\tappend<uint32_t>(utf8.size());"
print "\t\tdata.insert(data.end(), utf8.begin(), utf8.end());"
print "\t\treturn true;"
print "\t}"
print "};"
print ""
print "} // namespace LibertyXDR"
print "namespace " PrefixCamel " {"
}
END {
print ""
print "} // namespace " PrefixCamel
}
function codegen_constant(name, value) {
print ""
print "enum { " name " = " value " };"
}
function codegen_enum_value(name, subname, value, cg) {
append(cg, "fields", "\t" subname " = " value ",\n")
}
function codegen_enum(name, cg) {
print ""
print "enum struct " name " : int8_t {"
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] = \
"\tw.append(static_cast<int8_t>(%s));\n"
CodegenDeserialize[name] = \
"\t{\n" \
"\t\tint8_t v = 0;\n" \
"\t\tif (!r.read(v) || !v)\n" \
"\t\t\treturn false;\n" \
"\t\t%s = static_cast<" name ">(v);\n" \
"\t}\n"
CodegenCType[name] = name
for (i in cg)
delete cg[i]
}
# Some identifiers do not pose a problem in C, but do in our C++.
function codegen_struct_sanitize(name) {
if (name ~ /^(serialize|deserialize)_*$/ ||
name ~ /^(catch|class|delete|except|finally|friend|new|operator)_*$/ ||
name ~ /^(private|protected|public|template|this|throw|try|virtual)_*$/)
return name "_"
return name
}
function codegen_struct_tag(d, cg, name, f) {
name = codegen_struct_sanitize(d["name"])
f = "this->" name
append(cg, "serialize", sprintf(CodegenSerialize[d["type"]], f))
# Do not deserialize here, that would be out of order.
}
function codegen_struct_field(d, cg, name, f, serialize, deserialize) {
name = codegen_struct_sanitize(d["name"])
f = "this->" name
serialize = CodegenSerialize[d["type"]]
deserialize = CodegenDeserialize[d["type"]]
if (!d["isarray"]) {
append(cg, "fields",
"\t" CodegenCType[d["type"]] " " name " = {};\n")
append(cg, "serialize", sprintf(serialize, f))
append(cg, "deserialize", sprintf(deserialize, f))
return
}
append(cg, "fields",
"\tstd::vector<" CodegenCType[d["type"]] "> " name ";\n")
# XXX: We should probably pedantically check for overflows.
append(cg, "serialize",
sprintf(CodegenSerialize["u32"], "uint32_t(" f ".size())") \
"\tfor (const auto &it : " f ")\n" \
indent(sprintf(serialize, "it")))
if (d["type"] == "u8") {
append(cg, "deserialize",
"\tif (!r.read(" f "))\n" \
"\t\treturn false;\n")
} else if (deserialize) {
append(cg, "deserialize",
"\t{\n" \
"\t\tuint32_t size = 0;\n" \
indent(sprintf(CodegenDeserialize["u32"], "size")) \
"\t\t" f ".resize(size);\n" \
"\t}\n" \
"\tfor (auto &it : " f ")\n" \
indent(sprintf(deserialize, "it")))
}
}
function codegen_struct(name, cg) {
print ""
print "struct " name " {"
print cg["fields"]
print "\tbool serialize(LibertyXDR::Writer &w) const {"
print indent(cg["serialize"]) "\t\treturn true;"
print "\t}"
print ""
print "\tbool deserialize([[maybe_unused]] LibertyXDR::Reader &r) {"
print indent(cg["deserialize"]) "\t\treturn true;"
print "\t}"
print "};"
CodegenSerialize[name] = "\tif (!%s->serialize(w))\n" \
"\t\treturn false;\n"
CodegenDeserialize[name] = "\tif (!%s->deserialize(r))\n" \
"\t\treturn false;\n"
CodegenCType[name] = name
for (i in cg)
delete cg[i]
}
function codegen_union_tag(name, d, cg, tagname) {
cg["tagtype"] = d["type"]
cg["tagname"] = tagname = codegen_struct_sanitize(d["name"])
print ""
print "struct " name " {"
print "\t" CodegenCType[d["type"]] " " tagname " = {};"
print "\tvirtual ~" name "() = 0;"
print "\tvirtual bool serialize(LibertyXDR::Writer &w) const = 0;"
print "\tvirtual bool deserialize(LibertyXDR::Reader &r) = 0;"
print "};"
print ""
print name "::~" name "() {}"
}
function codegen_union_struct(name, casename, cg, scg, structname) {
# And thus not all generated structs are present in Types.
structname = name "_" snaketocamel(casename)
print ""
print "struct " structname " : virtual public " name " {"
print scg["fields"]
print "\t" structname "() {"
print "\t\tthis->" cg["tagname"] " = " \
CodegenCType[cg["tagtype"]] "::" casename ";"
print "\t}"
print ""
print "\tvirtual bool serialize(LibertyXDR::Writer &w) const {"
print indent(scg["serialize"]) "\t\treturn true;"
print "\t}"
print ""
print "\tvirtual bool deserialize([[maybe_unused]] LibertyXDR::Reader &r) {"
print indent(scg["deserialize"]) "\t\treturn true;"
print "\t}"
print "};"
append(cg, "deserialize",
"\tcase " CodegenCType[cg["tagtype"]] "::" casename ":\n" \
"\t\treturn new " structname "();\n")
CodegenSerialize[structname] = "\tif (!%s->serialize(w))\n" \
"\t\treturn false;\n"
CodegenDeserialize[structname] = "\tif (!%s->deserialize(r))\n" \
"\t\treturn false;\n"
CodegenCType[structname] = structname
for (i in scg)
delete scg[i]
}
function codegen_union(name, cg, exhaustive, ctype) {
CodegenSerialize[name] = "\tif (!%s->serialize(w))\n" \
"\t\treturn false;\n"
ctype = "std::unique_ptr<" name ">"
if (cg["deserialize"]) {
print ""
print "static " name " *read" name "(" \
CodegenCType[cg["tagtype"]] " " cg["tagname"] ") {"
print "\tswitch (" cg["tagname"] ") {"
print cg["deserialize"] "\tdefault:"
print "\t\treturn nullptr;"
print "\t}"
print "}"
print ""
print "static " ctype " read" name "(LibertyXDR::Reader &r) {"
print "\tint8_t v = 0;"
print "\tif (!r.read(v) || !v)"
print "\t\treturn nullptr;"
print ""
print "\t" ctype " result(read" name "(static_cast<" \
CodegenCType[cg["tagtype"]] ">(v)));"
print "\tif (!result || !result->deserialize(r))"
print "\t\treturn nullptr;"
print "\treturn result;"
print "}"
CodegenDeserialize[name] = "\tif (!(%s = read" name "(r)))\n" \
"\t\treturn false;\n"
}
CodegenCType[name] = ctype
for (i in cg)
delete cg[i]
}

2
tools/lxdrgen-go.awk
View File

@ -439,7 +439,7 @@ function codegen_struct(name, cg, gotype) {
delete cg[i]
}
function codegen_union_tag(d, cg) {
function codegen_union_tag(name, d, cg) {
cg["tagtype"] = d["type"]
cg["tagname"] = snaketocamel(d["name"])
# The tag is implied from the type of struct stored in the interface.

2
tools/lxdrgen-mjs.awk
View File

@ -183,7 +183,7 @@ function codegen_struct(name, cg) {
delete cg[i]
}
function codegen_union_tag(d, cg) {
function codegen_union_tag(name, d, cg) {
cg["tagtype"] = d["type"]
cg["tagname"] = decapitalize(snaketocamel(d["name"]))
}

2
tools/lxdrgen-swift.awk
View File

@ -215,7 +215,7 @@ function codegen_struct(name, cg, swifttype) {
delete cg[i]
}
function codegen_union_tag(d, cg) {
function codegen_union_tag(name, d, cg) {
cg["tagtype"] = d["type"]
cg["tagname"] = decapitalize(snaketocamel(d["name"]))
}

2
tools/lxdrgen.awk
View File

@ -232,7 +232,7 @@ function defunion( name, tag, tagtype, tagvalue, cg, scg, d, a, i,
if (Types[tagtype] != "enum")
fatal("not an enum type: " tagtype)
codegen_union_tag(tag, cg)
codegen_union_tag(name, tag, cg)
split(EnumValues[tagtype], a, SUBSEP)
for (i in a)