/* * 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 #include #include #include #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_string *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_string *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(struct upb_strtable *t, int *size) { *size = t->t.count; void **array = malloc(*size * sizeof(void*)); struct 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(struct upb_def *defs[], int num_entries, char *outfile_name, FILE *stream) { /* Header file prologue. */ upb_string *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; struct upb_enumdef *enumdef = upb_downcast_enumdef(defs[i]); upb_string *enum_name = upb_strdup(UPB_UPCAST(enumdef)->fqname); upb_string *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)); struct 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_string *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); } /* 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(struct upb_def *defs[], int num_defs, char *outfile_name, char *descriptor_cident, FILE *stream) { /* Header file prologue. */ upb_string *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 \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 */ struct upb_msgdef *m = upb_dyncast_msgdef(defs[i]); if(!m) continue; upb_string *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\n", UPB_STRARG(msg_name), 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 */ struct upb_msgdef *m = upb_dyncast_msgdef(defs[i]); if(!m) continue; upb_string *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"}; struct 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++) { struct upb_fielddef *f = &m->fields[j]; if(upb_issubmsg(f)) { upb_string *type_name = upb_strdup(f->def->fqname); to_cident(type_name); if(f->label == GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_LABEL_REPEATED) { fprintf(stream, " UPB_MSG_ARRAY(" 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 == GOOGLE_PROTOBUF_FIELDDESCRIPTORPROTO_LABEL_REPEATED) { static char* c_types[] = { "", "struct upb_double_array*", "struct upb_float_array*", "struct upb_int64_array*", "struct upb_uint64_array*", "struct upb_int32_array*", "struct upb_uint64_array*", "struct upb_uint32_array*", "struct upb_bool_array*", "struct upb_string_array*", "", "", "struct upb_string_array*", "struct upb_uint32_array*", "struct upb_uint32_array*", "struct upb_int32_array*", "struct upb_int64_array*", "struct upb_int32_array*", "struct upb_int64_array*" }; fprintf(stream, " %s " UPB_STRFMT ";\n", c_types[f->type], UPB_STRARG(f->name)); } else { static char* c_types[] = { "", "double", "float", "int64_t", "uint64_t", "int32_t", "uint64_t", "uint32_t", "bool", "upb_string*", "", "", "upb_string*", "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", stream); fprintf(stream, "UPB_DEFINE_MSG_ARRAY(" UPB_STRFMT ")\n\n", UPB_STRARG(msg_name)); 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. */ struct strtable_entry { struct upb_strtable_entry e; int offset; int num; }; struct typetable_entry { struct upb_strtable_entry e; struct upb_fielddef *field; upb_string *cident; /* Type name converted with to_cident(). */ /* A list of all values of this type, in an established order. */ union upb_value *values; int values_size, values_len; struct array { int offset; int len; upb_array *ptr; /* So we can find it later. */ } *arrays; int arrays_size, arrays_len; }; struct msgtable_entry { struct upb_inttable_entry e; void *msg; int num; /* Unique offset into the list of all msgs of this type. */ }; int compare_entries(const void *_e1, const void *_e2) { struct 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, struct upb_msgdef *md, struct upb_strtable *t); static void add_strings_from_value(union upb_value p, struct upb_fielddef *f, struct upb_strtable *t) { if(upb_isstringtype(f->type)) { struct 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, struct upb_msgdef *md, struct upb_strtable *t) { for(upb_field_count_t i = 0; i < md->num_fields; i++) { struct upb_fielddef *f = &md->fields[i]; if(!upb_msg_has(msg, f)) continue; union upb_value p = upb_msg_get(msg, f); if(upb_isarray(f)) { upb_array *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. */ struct typetable_entry *get_or_insert_typeentry(struct upb_strtable *t, struct upb_fielddef *f) { upb_string *type_name = upb_issubmsg(f) ? upb_strdup(f->def->fqname) : upb_strdupc(upb_type_info[f->type].ctype); struct typetable_entry *type_e = upb_strtable_lookup(t, type_name); if(type_e == NULL) { struct typetable_entry new_type_e = { .e = {.key = type_name}, .field = f, .cident = upb_strdup(type_name), .values = NULL, .values_size = 0, .values_len = 0, .arrays = NULL, .arrays_size = 0, .arrays_len = 0 }; to_cident(new_type_e.cident); 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); } else { upb_string_unref(type_name); } return type_e; } static void add_value(union upb_value v, struct upb_fielddef *f, struct upb_strtable *t) { struct 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, struct upb_msgdef *md, struct upb_strtable *t) { for(upb_field_count_t i = 0; i < md->num_fields; i++) { struct upb_fielddef *f = &md->fields[i]; if(!upb_msg_has(msg, f)) continue; union upb_value v = upb_msg_get(msg, f); if(upb_isarray(f)) { if(upb_isstring(f)) continue; /* Handled by a different code-path. */ upb_array *arr = v.arr; /* Add to our list of arrays for this type. */ struct 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, struct 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. */ struct upb_strtable strings; upb_strtable_init(&strings, 16, sizeof(struct strtable_entry)); add_strings_from_msg(msg, md, &strings); int size; struct 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_string *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_norefcount_string strings[] = {\n", stream); for(int i = 0; i < size; i++) { struct strtable_entry *e = str_entries[i]; fprintf(stream, " UPB_STRLIT_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. */ struct upb_strtable types; upb_strtable_init(&types, 16, sizeof(struct typetable_entry)); union upb_value val = {.msg = msg}; /* A fake field to get the recursion going. */ struct 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"); struct 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_MSG_ARRAY(" UPB_STRFMT ") " UPB_STRFMT "_arrays[%d] = {\n", UPB_STRARG(e->cident), UPB_STRARG(e->cident), e->arrays_len); for(int i = 0; i < e->arrays_len; i++) { struct array *arr = &e->arrays[i]; fprintf(stream, " {.elements = &" UPB_STRFMT "_array_elems[%d], .len=%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++) { union upb_value val = e->values[i]; if(upb_issubmsg(e->field)) { struct 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++) { struct 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++) { struct upb_fielddef *f = &m->fields[j]; union upb_value val = upb_msg_get(msgdata, f); fprintf(stream, " ." UPB_STRFMT " = ", UPB_STRARG(f->name)); if(!upb_msg_has(msgdata, f)) { 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 { struct strtable_entry *str_e = upb_strtable_lookup(&strings, val.str); assert(str_e); fprintf(stream, "(upb_string*)&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. */ struct 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(type_e->arrays[k].ptr == val.arr) { arr_num = k; break; } } assert(arr_num != -1); fprintf(stream, "&" 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. */ struct 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); } struct 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->e.key); 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) { if(d->set_flags.has.field) upb_fielddef_sortfds(d->field->elements, d->field->len); if(d->set_flags.has.nested_type) for(uint32_t i = 0; i < d->nested_type->len; i++) sort_fields_in_descriptor(d->nested_type->elements[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_string *descriptor = upb_strreadfile(input_file); if(!descriptor) error("Couldn't read input file."); struct upb_symtab *s = upb_symtab_new(); upb_msg *fds_msg = upb_msg_new(s->fds_msgdef); struct upb_status status = UPB_STATUS_INIT; upb_msg_parsestr(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 < fds->file->len; i++) { google_protobuf_FileDescriptorProto *fd = fds->file->elements[i]; if(!fd->set_flags.has.message_type) continue; for(uint32_t j = 0; j < fd->message_type->len; j++) sort_fields_in_descriptor(fd->message_type->elements[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; struct 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; }