converter/babeltrace-lib.c

   1 /*
   2  * babeltrace-lib.c
   3  *
   4  * Babeltrace Trace Converter Library
   5  *
   6  * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
   7  *
   8  * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  */
  20
  21 #include <stdlib.h>
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <inttypes.h>
  25 #include <babeltrace/babeltrace.h>
  26 #include <babeltrace/format.h>
  27 #include <babeltrace/ctf/types.h>
  28 #include <babeltrace/ctf/metadata.h>
  29 #include <babeltrace/ctf-text/types.h>
  30 #include <babeltrace/prio_heap.h>
  31
  32 static int read_event(struct ctf_file_stream *sin)
  33 {
  34         int ret;
  35
  36         ret = sin->pos.parent.event_cb(&sin->pos.parent, &sin->parent);
  37         if (ret == EOF)
  38                 return EOF;
  39         else if (ret) {
  40                 fprintf(stdout, "[error] Reading event failed.\n");
  41                 return ret;
  42         }
  43         return 0;
  44 }
  45
  46 /*
  47  * returns true if a < b, false otherwise.
  48  */
  49 int stream_compare(void *a, void *b)
  50 {
  51         struct ctf_file_stream *s_a = a, *s_b = b;
  52
  53         if (s_a->parent.timestamp < s_b->parent.timestamp)
  54                 return 1;
  55         else
  56                 return 0;
  57 }
  58
  59 int convert_trace(struct trace_descriptor *td_write,
  60                   struct trace_descriptor *td_read)
  61 {
  62         struct ctf_trace *tin = container_of(td_read, struct ctf_trace, parent);
  63         struct ctf_text_stream_pos *sout =
  64                 container_of(td_write, struct ctf_text_stream_pos, trace_descriptor);
  65         int stream_id;
  66         int ret = 0;
  67
  68         tin->stream_heap = g_new(struct ptr_heap, 1);
  69         heap_init(tin->stream_heap, 0, stream_compare);
  70
  71         /* Populate heap with each stream */
  72         for (stream_id = 0; stream_id < tin->streams->len; stream_id++) {
  73                 struct ctf_stream_class *stream = g_ptr_array_index(tin->streams, stream_id);
  74                 int filenr;
  75
  76                 if (!stream)
  77                         continue;
  78                 for (filenr = 0; filenr < stream->streams->len; filenr++) {
  79                         struct ctf_file_stream *file_stream = g_ptr_array_index(stream->streams, filenr);
  80                         ret = read_event(file_stream);
  81                         if (ret == EOF) {
  82                                 ret = 0;
  83                                 continue;
  84                         } else if (ret)
  85                                 goto end;
  86                         /* Add to heap */
  87                         ret = heap_insert(tin->stream_heap, file_stream);
  88                         if (ret) {
  89                                 fprintf(stdout, "[error] Out of memory.\n");
  90                                 goto end;
  91                         }
  92                 }
  93         }
  94
  95         /* Replace heap entries until EOF for each stream (heap empty) */
  96         for (;;) {
  97                 struct ctf_file_stream *file_stream, *removed;
  98
  99                 file_stream = heap_maximum(tin->stream_heap);
 100                 if (!file_stream) {
 101                         /* end of file for all streams */
 102                         ret = 0;
 103                         break;
 104                 }
 105                 ret = sout->parent.event_cb(&sout->parent, &file_stream->parent);
 106                 if (ret) {
 107                         fprintf(stdout, "[error] Writing event failed.\n");
 108                         goto end;
 109                 }
 110                 ret = read_event(file_stream);
 111                 if (ret == EOF) {
 112                         removed = heap_remove(tin->stream_heap);
 113                         assert(removed == file_stream);
 114                         ret = 0;
 115                         continue;
 116                 } else if (ret)
 117                         goto end;
 118                 /* Reinsert the file stream into the heap, and rebalance. */
 119                 removed = heap_replace_max(tin->stream_heap, file_stream);
 120                 assert(removed == file_stream);
 121         }
 122
 123 end:
 124         heap_free(tin->stream_heap);
 125         g_free(tin->stream_heap);
 126         return ret;
 127 }