Protocol Buffers - Google's data interchange format (grpc依赖) https://developers.google.com/protocol-buffers/
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

751 lines
28 KiB

/*
* upb - a minimalist implementation of protocol buffers.
*
* upbc is the upb compiler. This is some deep code that I wish could be
* easier to understand, but by its nature it is doing some very "meta"
* kinds of things.
*
* Copyright (c) 2009 Joshua Haberman. See LICENSE for details.
*/
#include <ctype.h>
#include <inttypes.h>
#include <stdarg.h>
#include <stdlib.h>
#include "descriptor.h"
#include "upb_data.h"
#include "upb_def.h"
#include "upb_text.h"
/* These are in-place string transformations that do not change the length of
* the string (and thus never need to re-allocate). */
// Convert to C identifier: foo.bar.Baz -> foo_bar_Baz.
static void to_cident(upb_strptr str)
{
upb_strlen_t len = upb_strlen(str);
char *buf = upb_string_getrwbuf(str, len);
for(uint32_t i = 0; i < len; i++)
if(buf[i] == '.' || buf[i] == '/')
buf[i] = '_';
}
// Convert to C proprocessor identifier: foo.bar.Baz -> FOO_BAR_BAZ.
static void to_preproc(upb_strptr str)
{
to_cident(str);
upb_strlen_t len = upb_strlen(str);
char *buf = upb_string_getrwbuf(str, len);
for(uint32_t i = 0; i < len; i++)
buf[i] = toupper(buf[i]);
}
static int my_memrchr(const char *data, char c, size_t len)
{
int off = len-1;
while(off > 0 && data[off] != c) --off;
return off;
}
void *strtable_to_array(upb_strtable *t, int *size)
{
*size = t->t.count;
void **array = malloc(*size * sizeof(void*));
upb_strtable_entry *e;
int i = 0;
for(e = upb_strtable_begin(t); e && i < *size; e = upb_strtable_next(t, e))
array[i++] = e;
assert(i == *size && e == NULL);
return array;
}
/* The _const.h file defines the constants (enums) defined in the .proto
* file. */
static void write_const_h(upb_def *defs[], int num_entries, char *outfile_name,
FILE *stream)
{
/* Header file prologue. */
upb_strptr include_guard_name = upb_strdupc(outfile_name);
to_preproc(include_guard_name);
/* A bit cheesy, but will do the job. */
upb_strlen_t len = upb_strlen(include_guard_name);
char *buf = upb_string_getrwbuf(include_guard_name, len);
buf[len-1] = 'C';
fputs("/* This file was generated by upbc (the upb compiler). "
"Do not edit. */\n\n", stream),
fprintf(stream, "#ifndef " UPB_STRFMT "\n", UPB_STRARG(include_guard_name));
fprintf(stream, "#define " UPB_STRFMT "\n\n", UPB_STRARG(include_guard_name));
fputs("#ifdef __cplusplus\n", stream);
fputs("extern \"C\" {\n", stream);
fputs("#endif\n\n", stream);
/* Enums. */
fprintf(stream, "/* Enums. */\n\n");
for(int i = 0; i < num_entries; i++) { /* Foreach enum */
if(defs[i]->type != UPB_DEF_ENUM) continue;
upb_enumdef *enumdef = upb_downcast_enumdef(defs[i]);
upb_strptr enum_name = upb_strdup(UPB_UPCAST(enumdef)->fqname);
upb_strptr enum_val_prefix = upb_strdup(enum_name);
to_cident(enum_name);
const char *data = upb_string_getrobuf(enum_val_prefix);
upb_strlen_t len = upb_strlen(enum_val_prefix);
upb_strlen_t lastsep = my_memrchr(data, UPB_SYMBOL_SEPARATOR, len);
upb_string_resize(enum_val_prefix, lastsep + 1);
to_preproc(enum_val_prefix);
fprintf(stream, "typedef enum " UPB_STRFMT " {\n", UPB_STRARG(enum_name));
upb_enum_iter iter;
bool first = true;
/* Foreach enum value. */
for(upb_enum_begin(&iter, enumdef); !upb_enum_done(&iter); upb_enum_next(&iter)) {
upb_strptr value_name = upb_strdup(iter.name);
to_preproc(value_name);
/* " GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_TYPE_UINT32 = 13," */
if (!first) fputs(",\n", stream);
first = false;
fprintf(stream, " " UPB_STRFMT UPB_STRFMT " = %" PRIu32,
UPB_STRARG(enum_val_prefix), UPB_STRARG(value_name), iter.val);
upb_string_unref(value_name);
}
fprintf(stream, "\n} " UPB_STRFMT ";\n\n", UPB_STRARG(enum_name));
upb_string_unref(enum_name);
upb_string_unref(enum_val_prefix);
}
/* Constants for field names and numbers. */
fprintf(stream, "/* Constants for field names and numbers. */\n\n");
for(int i = 0; i < num_entries; i++) { /* Foreach enum */
upb_msgdef *m = upb_dyncast_msgdef(defs[i]);
if(!m) continue;
upb_strptr msg_name = upb_strdup(UPB_UPCAST(m)->fqname);
upb_strptr msg_val_prefix = upb_strdup(msg_name);
to_preproc(msg_val_prefix);
for(upb_field_count_t j = 0; j < m->num_fields; j++) {
upb_fielddef *f = &m->fields[j];
upb_strptr preproc_field_name = upb_strdup(f->name);
to_preproc(preproc_field_name);
fprintf(stream, "#define " UPB_STRFMT "_" UPB_STRFMT "_FIELDNUM %d\n",
UPB_STRARG(msg_val_prefix), UPB_STRARG(preproc_field_name), f->number);
fprintf(stream, "#define " UPB_STRFMT "_" UPB_STRFMT "_FIELDNAME \""
UPB_STRFMT "\"\n", UPB_STRARG(msg_val_prefix), UPB_STRARG(preproc_field_name), UPB_STRARG(f->name));
upb_string_unref(preproc_field_name);
}
upb_string_unref(msg_val_prefix);
}
/* Epilogue. */
fputs("#ifdef __cplusplus\n", stream);
fputs("} /* extern \"C\" */\n", stream);
fputs("#endif\n\n", stream);
fprintf(stream, "#endif /* " UPB_STRFMT " */\n", UPB_STRARG(include_guard_name));
upb_string_unref(include_guard_name);
}
/* The .h file defines structs for the types defined in the .proto file. It
* also defines constants for the enum values.
*
* Assumes that d has been validated. */
static void write_h(upb_def *defs[], int num_defs, char *outfile_name,
char *descriptor_cident, FILE *stream)
{
/* Header file prologue. */
upb_strptr include_guard_name = upb_strdupc(outfile_name);
to_preproc(include_guard_name);
fputs("/* This file was generated by upbc (the upb compiler). "
"Do not edit. */\n\n", stream),
fprintf(stream, "#ifndef " UPB_STRFMT "\n", UPB_STRARG(include_guard_name));
fprintf(stream, "#define " UPB_STRFMT "\n\n", UPB_STRARG(include_guard_name));
fputs("#include <upb_data.h>\n\n", stream);
fputs("#ifdef __cplusplus\n", stream);
fputs("extern \"C\" {\n", stream);
fputs("#endif\n\n", stream);
if(descriptor_cident) {
fputs("struct google_protobuf_FileDescriptorSet;\n", stream);
fprintf(stream, "extern struct google_protobuf_FileDescriptorSet *%s;\n\n",
descriptor_cident);
}
/* Forward declarations. */
fputs("/* Forward declarations of all message types.\n", stream);
fputs(" * So they can refer to each other in ", stream);
fputs("possibly-recursive ways. */\n\n", stream);
for(int i = 0; i < num_defs; i++) { /* Foreach message */
upb_msgdef *m = upb_dyncast_msgdef(defs[i]);
if(!m) continue;
upb_strptr msg_name = upb_strdup(UPB_UPCAST(m)->fqname);
to_cident(msg_name);
fprintf(stream, "struct " UPB_STRFMT ";\n", UPB_STRARG(msg_name));
fprintf(stream, "typedef struct " UPB_STRFMT "\n " UPB_STRFMT ";\n",
UPB_STRARG(msg_name), UPB_STRARG(msg_name));
fprintf(stream, "UPB_DEFINE_MSG_ARRAY(" UPB_STRFMT ")\n\n",
UPB_STRARG(msg_name));
upb_string_unref(msg_name);
}
/* Message Declarations. */
fputs("/* The message definitions themselves. */\n\n", stream);
for(int i = 0; i < num_defs; i++) { /* Foreach message */
upb_msgdef *m = upb_dyncast_msgdef(defs[i]);
if(!m) continue;
upb_strptr msg_name = upb_strdup(UPB_UPCAST(m)->fqname);
to_cident(msg_name);
fprintf(stream, "struct " UPB_STRFMT " {\n", UPB_STRARG(msg_name));
fputs(" upb_data base;\n", stream);
fputs(" union {\n", stream);
fprintf(stream, " uint8_t bytes[%" PRIu32 "];\n", m->set_flags_bytes);
fputs(" struct {\n", stream);
for(upb_field_count_t j = 0; j < m->num_fields; j++) {
static char* labels[] = {"", "optional", "required", "repeated"};
upb_fielddef *f = &m->fields[j];
fprintf(stream, " bool " UPB_STRFMT ":1; /* = %" PRIu32 ", %s. */\n",
UPB_STRARG(f->name), f->number, labels[f->label]);
}
fputs(" } has;\n", stream);
fputs(" } set_flags;\n", stream);
for(upb_field_count_t j = 0; j < m->num_fields; j++) {
upb_fielddef *f = &m->fields[j];
if(upb_issubmsg(f)) {
upb_strptr type_name = upb_strdup(f->def->fqname);
to_cident(type_name);
if(f->label == UPB_LABEL(REPEATED)) {
fprintf(stream, " UPB_MSG_ARRAYPTR(" UPB_STRFMT ") " UPB_STRFMT ";\n",
UPB_STRARG(type_name), UPB_STRARG(f->name));
} else {
fprintf(stream, " " UPB_STRFMT "* " UPB_STRFMT ";\n",
UPB_STRARG(type_name), UPB_STRARG(f->name));
}
upb_string_unref(type_name);
} else if(f->label == UPB_LABEL(REPEATED)) {
fprintf(stream, " upb_arrayptr " UPB_STRFMT ";\n", UPB_STRARG(f->name));
} else {
static char* c_types[] = {
"", "double", "float", "int64_t", "uint64_t", "int32_t", "uint64_t",
"uint32_t", "bool", "upb_strptr", "", "",
"upb_strptr", "uint32_t", "int32_t", "int32_t", "int64_t",
"int32_t", "int64_t"
};
fprintf(stream, " %s " UPB_STRFMT ";\n",
c_types[f->type], UPB_STRARG(f->name));
}
}
fputs("};\n\n", stream);
upb_string_unref(msg_name);
}
/* Epilogue. */
fputs("#ifdef __cplusplus\n", stream);
fputs("} /* extern \"C\" */\n", stream);
fputs("#endif\n\n", stream);
fprintf(stream, "#endif /* " UPB_STRFMT " */\n", UPB_STRARG(include_guard_name));
upb_string_unref(include_guard_name);
}
/* Format of table entries that we use when analyzing data structures for
* write_messages_c. */
typedef struct {
upb_strtable_entry e;
int offset;
int num;
} strtable_entry;
typedef struct {
upb_strtable_entry e;
upb_fielddef *field;
upb_strptr cident; /* Type name converted with to_cident(). */
/* A list of all values of this type, in an established order. */
upb_value *values;
int values_size, values_len;
struct array {
int offset;
int len;
upb_arrayptr ptr; /* So we can find it later. */
} *arrays;
int arrays_size, arrays_len;
} typetable_entry;
typedef struct {
upb_inttable_entry e;
void *msg;
int num; /* Unique offset into the list of all msgs of this type. */
} msgtable_entry;
int compare_entries(const void *_e1, const void *_e2)
{
strtable_entry *const*e1 = _e1, *const*e2 = _e2;
return upb_strcmp((*e1)->e.key, (*e2)->e.key);
}
/* Mutually recursive functions to recurse over a set of possibly nested
* messages and extract all the strings.
*
* TODO: make these use a generic msg visitor. */
static void add_strings_from_msg(upb_msg *msg, upb_msgdef *md, upb_strtable *t);
static void add_strings_from_value(upb_value p, upb_fielddef *f,
upb_strtable *t)
{
if(upb_isstringtype(f->type)) {
strtable_entry e = {.e = {.key = p.str}};
if(upb_strtable_lookup(t, e.e.key) == NULL)
upb_strtable_insert(t, &e.e);
} else if(upb_issubmsg(f)) {
add_strings_from_msg(p.msg, upb_downcast_msgdef(f->def), t);
}
}
static void add_strings_from_msg(upb_msg *msg, upb_msgdef *md, upb_strtable *t)
{
for(upb_field_count_t i = 0; i < md->num_fields; i++) {
upb_fielddef *f = &md->fields[i];
if(!upb_msg_has(msg, f)) continue;
upb_value p = upb_msg_get(msg, f);
if(upb_isarray(f)) {
upb_arrayptr arr = p.arr;
for(uint32_t j = 0; j < upb_array_len(arr); j++)
add_strings_from_value(upb_array_get(arr, f, j), f, t);
} else {
add_strings_from_value(p, f, t);
}
}
}
/* Mutually recursive functions to recurse over a set of possibly nested
* messages and extract all the messages (keyed by type).
*
* TODO: make these use a generic msg visitor. */
typetable_entry *get_or_insert_typeentry(upb_strtable *t, upb_fielddef *f)
{
upb_strptr type_name = upb_issubmsg(f) ?
upb_strdup(f->def->fqname) : upb_strdupc(upb_types[f->type].ctype);
typetable_entry *type_e = upb_strtable_lookup(t, type_name);
if(type_e == NULL) {
upb_strptr cident = upb_strdup(type_name);
to_cident(cident);
typetable_entry new_type_e = {
.e = {.key = type_name}, .field = f, .cident = cident,
.values = NULL, .values_size = 0, .values_len = 0,
.arrays = NULL, .arrays_size = 0, .arrays_len = 0
};
assert(upb_strtable_lookup(t, type_name) == NULL);
assert(upb_strtable_lookup(t, new_type_e.e.key) == NULL);
upb_strtable_insert(t, &new_type_e.e);
type_e = upb_strtable_lookup(t, type_name);
assert(type_e);
}
upb_string_unref(type_name);
return type_e;
}
static void add_value(upb_value v, upb_fielddef *f, upb_strtable *t)
{
typetable_entry *type_e = get_or_insert_typeentry(t, f);
if(type_e->values_len == type_e->values_size) {
type_e->values_size = UPB_MAX(type_e->values_size * 2, 4);
type_e->values = realloc(type_e->values, sizeof(*type_e->values) * type_e->values_size);
}
type_e->values[type_e->values_len++] = v;
}
static void add_submsgs(upb_msg *msg, upb_msgdef *md, upb_strtable *t)
{
for(upb_field_count_t i = 0; i < md->num_fields; i++) {
upb_fielddef *f = &md->fields[i];
if(!upb_msg_has(msg, f)) continue;
upb_value v = upb_msg_get(msg, f);
if(upb_isarray(f)) {
if(upb_isstring(f)) continue; /* Handled by a different code-path. */
upb_arrayptr arr = v.arr;
/* Add to our list of arrays for this type. */
typetable_entry *arr_type_e = get_or_insert_typeentry(t, f);
if(arr_type_e->arrays_len == arr_type_e->arrays_size) {
arr_type_e->arrays_size = UPB_MAX(arr_type_e->arrays_size * 2, 4);
arr_type_e->arrays = realloc(arr_type_e->arrays,
sizeof(*arr_type_e->arrays)*arr_type_e->arrays_size);
}
arr_type_e->arrays[arr_type_e->arrays_len].offset = arr_type_e->values_len;
arr_type_e->arrays[arr_type_e->arrays_len].len = upb_array_len(arr);
arr_type_e->arrays[arr_type_e->arrays_len].ptr = v.arr;
arr_type_e->arrays_len++;
/* Add the individual values in the array. */
for(uint32_t j = 0; j < upb_array_len(arr); j++)
add_value(upb_array_get(arr, f, j), f, t);
/* Add submsgs. We must do this separately so that the msgs in this
* array are contiguous (and don't have submsgs of the same type
* interleaved). */
for(uint32_t j = 0; j < upb_array_len(arr); j++)
add_submsgs(upb_array_get(arr, f, j).msg, upb_downcast_msgdef(f->def), t);
} else {
if(!upb_issubmsg(f)) continue;
add_value(v, f, t);
add_submsgs(v.msg, upb_downcast_msgdef(f->def), t);
}
}
}
/* write_messages_c emits a .c file that contains the data of a protobuf,
* serialized as C structures. */
static void write_message_c(upb_msg *msg, upb_msgdef *md,
char *cident, char *hfile_name,
int argc, char *argv[], char *infile_name,
FILE *stream)
{
fputs(
"/*\n"
" * This file is a data dump of a protocol buffer into a C structure.\n"
" * It was created by the upb compiler (upbc) with the following\n"
" * command-line:\n"
" *\n", stream);
fputs(" * ", stream);
for(int i = 0; i < argc; i++) {
fputs(argv[i], stream);
if(i < argc-1) fputs(" ", stream);
}
fputs("\n *\n", stream);
fprintf(stream, " * This file is a dump of '%s'.\n", infile_name);
fputs(
" * It contains exactly the same data, but in a C structure form\n"
" * instead of a serialized protobuf. This file contains no code,\n"
" * only data.\n"
" *\n"
" * This file was auto-generated. Do not edit. */\n\n", stream);
fprintf(stream, "#include \"%s\"\n\n", hfile_name);
/* Gather all strings into a giant string. Use a hash to prevent adding the
* same string more than once. */
upb_strtable strings;
upb_strtable_init(&strings, 16, sizeof(strtable_entry));
add_strings_from_msg(msg, md, &strings);
int size;
strtable_entry **str_entries = strtable_to_array(&strings, &size);
/* Sort for nice size and reproduceability. */
qsort(str_entries, size, sizeof(void*), compare_entries);
/* Emit strings. */
fputs("static char strdata[] =\n \"", stream);
int col = 2;
int offset = 0;
for(int i = 0; i < size; i++) {
upb_strptr s = str_entries[i]->e.key;
str_entries[i]->offset = offset;
str_entries[i]->num = i;
const char *buf = upb_string_getrobuf(s);
for(uint32_t j = 0; j < upb_strlen(s); j++) {
if(++col == 80) {
fputs("\"\n \"", stream);
col = 3;
}
fputc(buf[j], stream);
}
offset += upb_strlen(s);
}
fputs("\";\n\n", stream);
fputs("static upb_static_string strings[] = {\n", stream);
for(int i = 0; i < size; i++) {
strtable_entry *e = str_entries[i];
fprintf(stream, " UPB_STATIC_STRING_INIT_LEN(&strdata[%d], %d),\n", e->offset, upb_strlen(e->e.key));
}
fputs("};\n\n", stream);
free(str_entries);
/* Gather a list of types for which we are emitting data, and give each msg
* a unique number within its type. */
upb_strtable types;
upb_strtable_init(&types, 16, sizeof(typetable_entry));
upb_value val = {.msg = msg};
/* A fake field to get the recursion going. */
upb_fielddef fake_field = {
.type = UPB_TYPE(MESSAGE),
.def = UPB_UPCAST(md),
};
add_value(val, &fake_field, &types);
add_submsgs(msg, md, &types);
/* Emit foward declarations for all msgs of all types, and define arrays. */
fprintf(stream, "/* Forward declarations of messages, and array decls. */\n");
typetable_entry *e = upb_strtable_begin(&types);
for(; e; e = upb_strtable_next(&types, &e->e)) {
fprintf(stream, "static " UPB_STRFMT " " UPB_STRFMT "_values[%d];\n\n",
UPB_STRARG(e->cident), UPB_STRARG(e->cident), e->values_len);
if(e->arrays_len > 0) {
fprintf(stream, "static " UPB_STRFMT " *" UPB_STRFMT "_array_elems[] = {\n",
UPB_STRARG(e->cident), UPB_STRARG(e->cident));
for(int i = 0; i < e->arrays_len; i++) {
struct array *arr = &e->arrays[i];
for(int j = 0; j < arr->len; j++)
fprintf(stream, " &" UPB_STRFMT "_values[%d],\n", UPB_STRARG(e->cident), arr->offset + j);
}
fprintf(stream, "};\n");
int cum_offset = 0;
fprintf(stream, "static upb_static_array " UPB_STRFMT "_arrays[%d] = {\n",
UPB_STRARG(e->cident), e->arrays_len);
for(int i = 0; i < e->arrays_len; i++) {
struct array *arr = &e->arrays[i];
fprintf(stream, " UPB_STATIC_ARRAY_INIT(&" UPB_STRFMT "_array_elems[%d], %d),\n",
UPB_STRARG(e->cident), cum_offset, arr->len);
cum_offset += arr->len;
}
fprintf(stream, "};\n");
}
}
/* Emit definitions. */
for(e = upb_strtable_begin(&types); e; e = upb_strtable_next(&types, &e->e)) {
fprintf(stream, "static " UPB_STRFMT " " UPB_STRFMT "_values[%d] = {\n\n",
UPB_STRARG(e->cident), UPB_STRARG(e->cident), e->values_len);
for(int i = 0; i < e->values_len; i++) {
upb_value val = e->values[i];
if(upb_issubmsg(e->field)) {
upb_msgdef *m = upb_downcast_msgdef(e->field->def);
void *msgdata = val.msg;
fputs(" {.base = {UPB_DATA_FROZEN},\n", stream);
/* Print set flags. */
fputs(" .set_flags = {.has = {\n", stream);
for(upb_field_count_t j = 0; j < m->num_fields; j++) {
upb_fielddef *f = &m->fields[j];
fprintf(stream, " ." UPB_STRFMT " = ", UPB_STRARG(f->name));
if(upb_msg_has(msgdata, f))
fprintf(stream, "true");
else
fprintf(stream, "false");
fputs(",\n", stream);
}
fputs(" }},\n", stream);
/* Print msg data. */
for(upb_field_count_t j = 0; j < m->num_fields; j++) {
upb_fielddef *f = &m->fields[j];
upb_value val = upb_msg_get(msgdata, f);
fprintf(stream, " ." UPB_STRFMT " = ", UPB_STRARG(f->name));
if(!upb_msg_has(msgdata, f)) {
if(upb_isarray(f) && upb_issubmsg(f)) {
// This is gross and needs cleanup.
fputs("{UPB_ARRAY_NULL_INITIALIZER}, /* Not set. */", stream);
} else if(upb_isarray(f)) {
fputs("UPB_ARRAY_NULL_INITIALIZER, /* Not set. */", stream);
} else if(upb_isstring(f)) {
fputs("UPB_STRING_NULL_INITIALIZER, /* Not set. */", stream);
} else {
fputs("0, /* Not set. */", stream);
}
} else if(upb_isstring(f)) {
if(upb_isarray(f)) {
fputs("Ack, string arrays are not supported yet!\n", stderr);
exit(1);
} else {
strtable_entry *str_e = upb_strtable_lookup(&strings, val.str);
assert(str_e);
fprintf(stream, "UPB_STATIC_STRING_PTR_INIT(strings[%d]), /* \"" UPB_STRFMT "\" */",
str_e->num, UPB_STRARG(val.str));
}
} else if(upb_isarray(f)) {
/* Find this submessage in the list of msgs for that type. */
typetable_entry *type_e = get_or_insert_typeentry(&types, f);
assert(type_e);
int arr_num = -1;
for(int k = 0; k < type_e->arrays_len; k++) {
if(upb_array_ptreql(type_e->arrays[k].ptr, val.arr)) {
arr_num = k;
break;
}
}
assert(arr_num != -1);
fprintf(stream, "UPB_STATIC_ARRAY_PTR_TYPED_INIT(" UPB_STRFMT "_arrays[%d]),", UPB_STRARG(type_e->cident), arr_num);
} else if(upb_issubmsg(f)) {
/* Find this submessage in the list of msgs for that type. */
typetable_entry *type_e = get_or_insert_typeentry(&types, f);
assert(type_e);
int msg_num = -1;
for(int k = 0; k < type_e->values_len; k++) {
if(type_e->values[k].msg == val.msg) {
msg_num = k;
break;
}
}
assert(msg_num != -1);
fprintf(stream, "&" UPB_STRFMT "_values[%d],", UPB_STRARG(type_e->cident), msg_num);
} else {
upb_text_printval(f->type, val, stream);
fputs(",", stream);
}
fputs("\n", stream);
}
fputs(" },\n", stream);
} else if(upb_isstring(e->field)) {
} else {
/* Non string, non-message data. */
upb_text_printval(e->field->type, val, stream);
}
}
fputs("};\n", stream);
}
typetable_entry *toplevel_type = get_or_insert_typeentry(&types, &fake_field);
assert(toplevel_type);
fputs("/* The externally-visible definition. */\n", stream);
/* It is always at offset zero, because we add it first. */
fprintf(stream, UPB_STRFMT " *%s = &" UPB_STRFMT "_values[0];\n",
UPB_STRARG(toplevel_type->cident), cident,
UPB_STRARG(toplevel_type->cident));
/* Free tables. */
for(e = upb_strtable_begin(&types); e; e = upb_strtable_next(&types, &e->e)) {
upb_string_unref(e->cident);
free(e->values);
free(e->arrays);
}
upb_strtable_free(&types);
upb_strtable_free(&strings);
}
const char usage[] =
"upbc -- upb compiler.\n"
"upb v0.1 http://blog.reverberate.org/upb/\n"
"\n"
"Usage: upbc [options] descriptor-file\n"
"\n"
" -i C-IDENFITER Output the descriptor as a C data structure with the\n"
" given identifier (otherwise only a header will be\n"
" generated\n"
"\n"
" -o OUTFILE-BASE Write to OUTFILE-BASE.h and OUTFILE-BASE.c instead\n"
" of using the input file as a basename.\n"
;
void usage_err(char *err)
{
fprintf(stderr, "upbc: %s\n\n", err);
fputs(usage, stderr);
exit(1);
}
void error(char *err, ...)
{
va_list args;
va_start(args, err);
fprintf(stderr, "upbc: ");
vfprintf(stderr, err, args);
va_end(args);
exit(1);
}
void sort_fields_in_descriptor(google_protobuf_DescriptorProto *d)
{
// XXX: modifying the array in place is totally not allowed.
if(d->set_flags.has.field) {
upb_fielddef_sortfds(_upb_array_getptr_raw(d->field.ptr, 0, 0)._void,
google_protobuf_FieldDescriptorProto_array_len(d->field));
}
if(d->set_flags.has.nested_type)
for(uint32_t i = 0; i < google_protobuf_DescriptorProto_array_len(d->nested_type); i++)
sort_fields_in_descriptor(google_protobuf_DescriptorProto_array_get(d->nested_type, i));
}
int main(int argc, char *argv[])
{
/* Parse arguments. */
char *outfile_base = NULL, *input_file = NULL, *cident = NULL;
for(int i = 1; i < argc; i++) {
if(strcmp(argv[i], "-o") == 0) {
if(++i == argc)
usage_err("-o must be followed by a FILE-BASE.");
else if(outfile_base)
usage_err("-o was specified multiple times.");
outfile_base = argv[i];
} else if(strcmp(argv[i], "-i") == 0) {
if(++i == argc)
usage_err("-i must be followed by a C-IDENTIFIER.");
else if(cident)
usage_err("-i was specified multiple times.");
cident = argv[i];
} else {
if(input_file)
usage_err("You can only specify one input file.");
input_file = argv[i];
}
}
if(!input_file) usage_err("You must specify an input file.");
if(!outfile_base) outfile_base = input_file;
// Read and parse input file.
upb_strptr descriptor = upb_strreadfile(input_file);
if(upb_string_isnull(descriptor))
error("Couldn't read input file.");
upb_symtab *s = upb_symtab_new();
upb_msg *fds_msg = upb_msg_new(s->fds_msgdef);
upb_status status = UPB_STATUS_INIT;
upb_msg_decodestr(fds_msg, s->fds_msgdef, descriptor, &status);
if(!upb_ok(&status))
error("Failed to parse input file descriptor: %s", status.msg);
google_protobuf_FileDescriptorSet *fds = (void*)fds_msg;
upb_symtab_add_desc(s, descriptor, &status);
if(!upb_ok(&status))
error("Failed to add descriptor: %s", status.msg);
// We need to sort the fields of all the descriptors. This is currently
// somewhat special-cased to when we are emitting a descriptor for
// FileDescriptorProto, which is used internally for bootstrapping.
//
// The fundamental issue is that we will be parsing descriptors into memory
// using a reflection-based code-path, but upb then reads the descriptors
// from memory using the C structs emitted by upbc. This means that the
// msgdef we will use internally to parse the descriptors must use the same
// field order as the .h files we are about to generate. But the msgdefs we
// will use to generate those .h files have already been sorted according to
// this scheme.
//
// If/when we ever make upbc more general, we'll have to revisit this.
for(uint32_t i = 0; i < google_protobuf_FileDescriptorProto_array_len(fds->file); i++) {
google_protobuf_FileDescriptorProto *fd = google_protobuf_FileDescriptorProto_array_get(fds->file, i);
if(!fd->set_flags.has.message_type) continue;
for(uint32_t j = 0; j < google_protobuf_DescriptorProto_array_len(fd->message_type); j++)
sort_fields_in_descriptor(google_protobuf_DescriptorProto_array_get(fd->message_type, j));
}
/* Emit output files. */
const int maxsize = 256;
char h_filename[maxsize], h_const_filename[maxsize], c_filename[maxsize];
if(snprintf(h_filename, maxsize, "%s.h", outfile_base) >= maxsize ||
snprintf(c_filename, maxsize, "%s.c", outfile_base) >= maxsize ||
snprintf(h_const_filename, maxsize, "%s_const.h", outfile_base) >= maxsize)
error("File base too long.\n");
FILE *h_file = fopen(h_filename, "w");
if(!h_file) error("Failed to open .h output file");
FILE *h_const_file = fopen(h_const_filename, "w");
if(!h_const_file) error("Failed to open _const.h output file");
int symcount;
upb_def **defs = upb_symtab_getdefs(s, &symcount, UPB_DEF_ANY);
write_h(defs, symcount, h_filename, cident, h_file);
write_const_h(defs, symcount, h_filename, h_const_file);
for (int i = 0; i < symcount; i++) upb_def_unref(defs[i]);
free(defs);
if(cident) {
FILE *c_file = fopen(c_filename, "w");
if(!c_file) error("Failed to open .h output file");
write_message_c(fds_msg, s->fds_msgdef, cident, h_filename, argc, argv, input_file, c_file);
fclose(c_file);
}
upb_msg_unref(fds_msg, s->fds_msgdef);
upb_string_unref(descriptor);
upb_symtab_unref(s);
fclose(h_file);
fclose(h_const_file);
return 0;
}