converter/babeltrace-lib.c

   1 /*
   2  * babeltrace-lib.c
   3  *
   4  * Babeltrace Trace Converter Library
   5  *
   6  * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  */
  18
  19 #include <stdlib.h>
  20 #include <errno.h>
  21 #include <stdio.h>
  22 #include <inttypes.h>
  23 #include <babeltrace/babeltrace.h>
  24 #include <babeltrace/format.h>
  25 #include <babeltrace/ctf/types.h>
  26 #include <babeltrace/ctf/metadata.h>
  27 #include <babeltrace/ctf-text/types.h>
  28
  29 static
  30 int convert_event(struct ctf_text_stream_pos *sout,
  31                   struct ctf_file_stream *sin)
  32 {
  33         struct ctf_stream *stream_class = sin->stream;
  34         struct ctf_event *event_class;
  35         uint64_t id = 0;
  36         int len_index;
  37         int ret;
  38
  39         if (sin->pos.offset == EOF)
  40                 return EOF;
  41
  42         /* Hide event payload struct brackets */
  43         sout->depth = -1;
  44
  45         /* Read and print event header */
  46         if (stream_class->event_header) {
  47                 ret = generic_rw(&sin->pos.parent, &stream_class->event_header->p);
  48                 if (ret)
  49                         goto error;
  50                 /* lookup event id */
  51                 len_index = struct_declaration_lookup_field_index(stream_class->event_header_decl,
  52                                 g_quark_from_static_string("id"));
  53                 if (len_index >= 0) {
  54                         struct definition_integer *defint;
  55                         struct field *field;
  56
  57                         field = struct_definition_get_field_from_index(stream_class->event_header, len_index);
  58                         assert(field->definition->declaration->id == CTF_TYPE_INTEGER);
  59                         defint = container_of(field->definition, struct definition_integer, p);
  60                         assert(defint->declaration->signedness == FALSE);
  61                         id = defint->value._unsigned;   /* set id */
  62                 }
  63
  64                 ret = generic_rw(&sout->parent, &stream_class->event_header->p);
  65                 if (ret)
  66                         goto error;
  67         }
  68
  69         /* Read and print stream-declared event context */
  70         if (stream_class->event_context) {
  71                 ret = generic_rw(&sin->pos.parent, &stream_class->event_context->p);
  72                 if (ret)
  73                         goto error;
  74                 ret = generic_rw(&sout->parent, &stream_class->event_context->p);
  75                 if (ret)
  76                         goto error;
  77         }
  78
  79         if (id >= stream_class->events_by_id->len) {
  80                 fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
  81                 return -EINVAL;
  82         }
  83         event_class = g_ptr_array_index(stream_class->events_by_id, id);
  84         if (!event_class) {
  85                 fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
  86                 return -EINVAL;
  87         }
  88
  89         /* Read and print event-declared event context */
  90         if (event_class->context) {
  91                 ret = generic_rw(&sin->pos.parent, &event_class->context->p);
  92                 if (ret)
  93                         goto error;
  94                 ret = generic_rw(&sout->parent, &event_class->context->p);
  95                 if (ret)
  96                         goto error;
  97         }
  98
  99         /* Read and print event payload */
 100         if (event_class->fields) {
 101                 ret = generic_rw(&sin->pos.parent, &event_class->fields->p);
 102                 if (ret)
 103                         goto error;
 104                 ret = generic_rw(&sout->parent, &event_class->fields->p);
 105                 if (ret)
 106                         goto error;
 107         }
 108
 109         return 0;
 110
 111 error:
 112         fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 113         return ret;
 114 }
 115
 116 static
 117 int convert_stream(struct ctf_text_stream_pos *sout,
 118                    struct ctf_file_stream *sin)
 119 {
 120         int ret;
 121
 122         /* For each event, print header, context, payload */
 123         /* TODO: order events by timestamps across streams */
 124         for (;;) {
 125                 ret = convert_event(sout, sin);
 126                 if (ret == EOF)
 127                         break;
 128                 else if (ret) {
 129                         fprintf(stdout, "[error] Printing event failed.\n");
 130                         goto error;
 131                 }
 132         }
 133
 134         return 0;
 135
 136 error:
 137         return ret;
 138 }
 139
 140 int convert_trace(struct trace_descriptor *td_write,
 141                   struct trace_descriptor *td_read)
 142 {
 143         struct ctf_trace *tin = container_of(td_read, struct ctf_trace, parent);
 144         struct ctf_text_stream_pos *sout =
 145                 container_of(td_write, struct ctf_text_stream_pos, trace_descriptor);
 146         int stream_id, filenr;
 147         int ret;
 148
 149         /* For each stream (TODO: order events by timestamp) */
 150         for (stream_id = 0; stream_id < tin->streams->len; stream_id++) {
 151                 struct ctf_stream *stream = g_ptr_array_index(tin->streams, stream_id);
 152
 153                 if (!stream)
 154                         continue;
 155                 for (filenr = 0; filenr < stream->files->len; filenr++) {
 156                         struct ctf_file_stream *file_stream = g_ptr_array_index(stream->files, filenr);
 157                         ret = convert_stream(sout, file_stream);
 158                         if (ret) {
 159                                 fprintf(stdout, "[error] Printing stream %d failed.\n", stream_id);
 160                                 goto error;
 161                         }
 162                 }
 163         }
 164
 165         return 0;
 166
 167 error:
 168         return ret;
 169 }