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-rw-r--r--src/plugins/perfmon/parse_util.c235
1 files changed, 235 insertions, 0 deletions
diff --git a/src/plugins/perfmon/parse_util.c b/src/plugins/perfmon/parse_util.c
new file mode 100644
index 00000000000..436acaa6de0
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+++ b/src/plugins/perfmon/parse_util.c
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+/*
+ * parse_util.c - halfhearted json parser
+ *
+ * Copyright (c) 2018 Cisco Systems and/or its affiliates
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <perfmon/perfmon.h>
+#include <vppinfra/unix.h>
+
+typedef enum
+{
+ STATE_START,
+ STATE_READ_NAME,
+ STATE_READ_VALUE,
+} parse_state_t;
+
+static u8 *
+downcase (u8 * s)
+{
+ u8 *rv = 0;
+ u8 c;
+ int i;
+
+ for (i = 0; i < vec_len (s); i++)
+ {
+ c = s[i];
+ if (c >= 'A' && c <= 'Z')
+ c = c + ('a' - 'A');
+ vec_add1 (rv, c);
+ }
+ return (rv);
+}
+
+uword *
+perfmon_parse_table (perfmon_main_t * pm, char *path, char *table_name)
+{
+ u8 *cp;
+ u8 *event_name;
+ int state = STATE_START;
+ uword *ht;
+ name_value_pair_t *nvp = 0;
+ name_value_pair_t **nvps = 0;
+ u8 *v;
+ int i;
+ u8 *json_filename;
+ clib_error_t *error;
+
+ /* Create the name/value hash table in any case... */
+ ht = hash_create_string (0, sizeof (uword));
+
+ json_filename = format (0, "%s/%s%c", path, table_name, 0);
+
+ vlib_log_debug (pm->log_class, "Try to read perfmon events from %s",
+ json_filename);
+
+ error = unix_proc_file_contents ((char *) json_filename, &cp);
+
+ if (error)
+ {
+ vlib_log_err (pm->log_class,
+ "Failed to read CPU-specific counter table");
+ vlib_log_err (pm->log_class,
+ "Download from https://download.01.org/perfmon, "
+ "and install as %s", json_filename);
+ vec_free (json_filename);
+ clib_error_report (error);
+ return ht;
+ }
+ vlib_log_debug (pm->log_class, "Read OK, parse the event table...");
+ vec_free (json_filename);
+
+again:
+ while (*cp)
+ {
+ switch (state)
+ {
+ case STATE_START:
+ while (*cp && *cp != '{' && *cp != '}' && *cp != ',')
+ cp++;
+ if (*cp == 0)
+ goto done;
+
+ /* Look for a new event */
+ if (*cp == '{')
+ {
+ if (*cp == 0)
+ {
+ error:
+ clib_warning ("parse fail");
+ hash_free (ht);
+ return 0;
+ }
+ cp++;
+ state = STATE_READ_NAME;
+ goto again;
+ }
+ else if (*cp == '}') /* end of event */
+ {
+ /* Look for the "EventName" nvp */
+ for (i = 0; i < vec_len (nvps); i++)
+ {
+ nvp = nvps[i];
+ if (!strncmp ((char *) nvp->name, "EventName", 9))
+ {
+ event_name = nvp->value;
+ goto found;
+ }
+ }
+ /* no name? */
+ for (i = 0; i < vec_len (nvps); i++)
+ {
+ vec_free (nvps[i]->name);
+ vec_free (nvps[i]->value);
+ }
+ vec_free (nvps);
+ cp++;
+ goto again;
+
+ found:
+ event_name = downcase (event_name);
+ hash_set_mem (ht, event_name, nvps);
+ nvp = 0;
+ nvps = 0;
+ cp++;
+ goto again;
+ }
+ else if (*cp == ',') /* punctuation */
+ {
+ cp++;
+ goto again;
+ }
+
+ case STATE_READ_NAME:
+ vec_validate (nvp, 0);
+ v = 0;
+ while (*cp && *cp != '"')
+ cp++;
+
+ if (*cp == 0)
+ {
+ vec_free (nvp);
+ goto error;
+ }
+
+ cp++;
+ while (*cp && *cp != '"')
+ {
+ vec_add1 (v, *cp);
+ cp++;
+ }
+ if (*cp == 0)
+ {
+ vec_free (v);
+ goto error;
+ }
+ cp++;
+ vec_add1 (v, 0);
+ nvp->name = v;
+ state = STATE_READ_VALUE;
+ goto again;
+
+ case STATE_READ_VALUE:
+ while (*cp && *cp != ':')
+ cp++;
+ if (*cp == 0)
+ {
+ vec_free (nvp->name);
+ goto error;
+ }
+ while (*cp && *cp != '"')
+ cp++;
+ if (*cp == 0)
+ {
+ vec_free (nvp->name);
+ goto error;
+ }
+ else
+ cp++;
+ v = 0;
+ while (*cp && *cp != '"')
+ {
+ vec_add1 (v, *cp);
+ cp++;
+ }
+ if (*cp == 0)
+ {
+ vec_free (nvp->name);
+ vec_free (v);
+ goto error;
+ }
+ vec_add1 (v, 0);
+ nvp->value = v;
+ vec_add1 (nvps, nvp);
+ while (*cp && *cp != ',' && *cp != '}')
+ cp++;
+ if (*cp == 0)
+ {
+ vec_free (nvp->name);
+ vec_free (nvp->value);
+ goto error;
+ }
+ else if (*cp == '}')
+ state = STATE_START;
+ else
+ {
+ cp++;
+ state = STATE_READ_NAME;
+ }
+ nvp = 0;
+ goto again;
+ }
+ }
+
+done:
+ return (ht);
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */