WebAssembly Micro Runtime first version

core/iwasm/runtime/utils/wasm_log.c

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+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * 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 "wasm_log.h"
+
+#include "wasm_platform_log.h"
+#include "wasm_thread.h"
+
+
+/**
+ * The verbose level of the log system.  Only those verbose logs whose
+ * levels are less than or equal to this value are outputed.
+ */
+static int log_verbose_level;
+
+/**
+ * The lock for protecting the global output stream of logs.
+ */
+static korp_mutex log_stream_lock;
+
+
+int
+_wasm_log_init ()
+{
+  log_verbose_level = 1;
+  return ws_mutex_init (&log_stream_lock, false);
+}
+
+void
+_wasm_log_set_verbose_level (int level)
+{
+  log_verbose_level = level;
+}
+
+bool
+_wasm_log_begin (int level)
+{
+  korp_tid self;
+
+  if (level > log_verbose_level) {
+    return false;
+  }
+
+  /* Try to own the log stream and start the log output.  */
+  ws_mutex_lock (&log_stream_lock);
+  self = ws_self_thread ();
+  wasm_printf ("[%X]: ", (int)self);
+
+  return true;
+}
+
+void
+_wasm_log_vprintf (const char *fmt, va_list ap)
+{
+  wasm_vprintf (fmt, ap);
+}
+
+void
+_wasm_log_printf (const char *fmt, ...)
+{
+  va_list ap;
+  va_start (ap, fmt);
+  _wasm_log_vprintf (fmt, ap);
+  va_end (ap);
+}
+
+void
+_wasm_log_end ()
+{
+  ws_mutex_unlock (&log_stream_lock);
+}
+
+void
+_wasm_log (int level, const char *file, int line,
+           const char *fmt, ...)
+{
+  if (_wasm_log_begin (level)) {
+    va_list ap;
+
+    if (file)
+      _wasm_log_printf ("%s:%d ", file, line);
+
+    va_start (ap, fmt);
+    _wasm_log_vprintf (fmt, ap);
+    va_end (ap);
+
+    _wasm_log_end ();
+  }
+}