diff options
author | Joshua Haberman <joshua@reverberate.org> | 2011-07-15 12:05:43 -0700 |
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committer | Joshua Haberman <joshua@reverberate.org> | 2011-07-15 12:05:43 -0700 |
commit | 10265aa56b22ac4f04e7ba08330138e4507534e4 (patch) | |
tree | e821c85219a10b4ee3df715ab774465fdf87cf1d /tools/upbc.c | |
parent | 6a1f3a66939308668ab8dce0d195afec16e02af9 (diff) |
Directory restructure.
Includes are now via upb/foo.h.
Files specific to the protobuf format are
now in upb/pb (the core library is concerned
with message definitions, handlers, and
byte streams, but knows nothing about any
particular serializationf format).
Diffstat (limited to 'tools/upbc.c')
-rw-r--r-- | tools/upbc.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/tools/upbc.c b/tools/upbc.c new file mode 100644 index 0000000..956a1b2 --- /dev/null +++ b/tools/upbc.c @@ -0,0 +1,221 @@ +/* + * upb - a minimalist implementation of protocol buffers. + * + * Copyright (c) 2009 Google Inc. See LICENSE for details. + * Author: Josh Haberman <jhaberman@gmail.com> + * + * upbc is the upb compiler, which at the moment simply takes a + * protocol descriptor and outputs a header file containing the + * names and types of the fields. + */ + +#include <ctype.h> +#include <inttypes.h> +#include <stdarg.h> +#include <stdlib.h> +#include "upb_def.h" +#include "upb_msg.h" +#include "upb_glue.h" +#include "upb_strstream.h" +#include "upb_decoder.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_string_len(str); + char *buf = upb_string_getrwbuf(str, len); + for(int32_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_string_len(str); + char *buf = upb_string_getrwbuf(str, len); + for(int32_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; +} + +/* 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_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_string_len(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_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_string_len(enum_val_prefix); + upb_strlen_t lastsep = my_memrchr(data, UPB_SYMBOL_SEPARATOR, len); + upb_string_getrwbuf(enum_val_prefix, lastsep + 1); + to_preproc(enum_val_prefix); + + fprintf(stream, "typedef enum " UPB_STRFMT " {\n", UPB_STRARG(enum_name)); + bool first = true; + /* Foreach enum value. */ + for (upb_enum_iter iter = upb_enum_begin(enumdef); + !upb_enum_done(iter); + iter = upb_enum_next(enumdef, iter)) { + upb_string *value_name = upb_strdup(upb_enum_iter_name(iter)); + 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), upb_enum_iter_number(iter)); + 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_string *msg_name = upb_strdup(UPB_UPCAST(m)->fqname); + upb_string *msg_val_prefix = upb_strdup(msg_name); + to_preproc(msg_val_prefix); + upb_msg_iter i; + for(i = upb_msg_begin(m); !upb_msg_done(i); i = upb_msg_next(m, i)) { + upb_fielddef *f = upb_msg_iter_field(i); + upb_string *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); + 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); +} + +const char usage[] = + "upbc -- upb compiler.\n" + "upb v0.1 http://blog.reverberate.org/upb/\n" + "\n" + "Usage: upbc [options] descriptor-file\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); +} + +int main(int argc, char *argv[]) +{ + /* Parse arguments. */ + char *outfile_base = NULL, *input_file = 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(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."); + + // TODO: make upb_parsedesc use a separate symtab, so we can use it here when + // importing descriptor.proto. + upb_symtab *s = upb_symtab_new(); + upb_status status = UPB_STATUS_INIT; + upb_parsedesc(s, descriptor, &status); + if(!upb_ok(&status)) { + upb_printerr(&status); + error("Failed to parse input file descriptor\n"); + } + upb_status_uninit(&status); + + /* Emit output files. */ + const int maxsize = 256; + char h_const_filename[maxsize]; + if(snprintf(h_const_filename, maxsize, "%s_const.h", outfile_base) >= maxsize) + error("File base too long.\n"); + + FILE *h_const_file = fopen(h_const_filename, "w"); + if(!h_const_file) error("Failed to open _const.h output file\n"); + + int symcount; + upb_def **defs = upb_symtab_getdefs(s, &symcount, UPB_DEF_ANY); + write_const_h(defs, symcount, h_const_filename, h_const_file); + for (int i = 0; i < symcount; i++) upb_def_unref(defs[i]); + free(defs); + upb_string_unref(descriptor); + upb_symtab_unref(s); + fclose(h_const_file); + + return 0; +} |