1 files changed, 85 insertions, 0 deletions
diff --git a/externals/oboe/samples/debug-utils/trace.cpp b/externals/oboe/samples/debug-utils/trace.cpp
new file mode 100644
index 0000000000..b2d176683a
--- /dev/null
+++ b/externals/oboe/samples/debug-utils/trace.cpp
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2017 The Android Open Source Project
+ *
+ * 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 <dlfcn.h>
+#include "logging_macros.h"
+#include <cstdio>
+#include "trace.h"
+
+static const int TRACE_MAX_SECTION_NAME_LENGTH = 100;
+
+// Tracing functions
+static void *(*ATrace_beginSection)(const char *sectionName);
+
+static void *(*ATrace_endSection)(void);
+
+static bool *(*ATrace_isEnabled)(void);
+
+typedef void *(*fp_ATrace_beginSection)(const char *sectionName);
+
+typedef void *(*fp_ATrace_endSection)(void);
+
+typedef bool *(*fp_ATrace_isEnabled)(void);
+
+bool Trace::is_enabled_ = false;
+bool Trace::has_error_been_shown_ = false;
+
+void Trace::beginSection(const char *fmt, ...) {
+
+  if (is_enabled_) {
+    static char buff[TRACE_MAX_SECTION_NAME_LENGTH];
+    va_list args;
+    va_start(args, fmt);
+    vsprintf(buff, fmt, args);
+    va_end(args);
+    ATrace_beginSection(buff);
+  } else if (!has_error_been_shown_) {
+    LOGE("Tracing is either not initialized (call Trace::initialize()) "
+         "or not supported on this device");
+    has_error_been_shown_ = true;
+  }
+}
+
+void Trace::endSection() {
+
+  if (is_enabled_) {
+    ATrace_endSection();
+  }
+}
+
+void Trace::initialize() {
+
+  // Using dlsym allows us to use tracing on API 21+ without needing android/trace.h which wasn't
+  // published until API 23
+  void *lib = dlopen("libandroid.so", RTLD_NOW | RTLD_LOCAL);
+  if (lib == nullptr) {
+    LOGE("Could not open libandroid.so to dynamically load tracing symbols");
+  } else {
+    ATrace_beginSection =
+        reinterpret_cast<fp_ATrace_beginSection >(
+            dlsym(lib, "ATrace_beginSection"));
+    ATrace_endSection =
+        reinterpret_cast<fp_ATrace_endSection >(
+            dlsym(lib, "ATrace_endSection"));
+    ATrace_isEnabled =
+        reinterpret_cast<fp_ATrace_isEnabled >(
+            dlsym(lib, "ATrace_isEnabled"));
+
+    if (ATrace_isEnabled != nullptr && ATrace_isEnabled()) {
+      is_enabled_ = true;
+    }
+  }
+}