Add coverage

tools/telemetry/third_party/coverage/coverage/ctracer/datastack.h

Index: tools/telemetry/third_party/coverage/coverage/ctracer/datastack.h
diff --git a/tools/telemetry/third_party/coverage/coverage/ctracer/datastack.h b/tools/telemetry/third_party/coverage/coverage/ctracer/datastack.h
new file mode 100644
index 0000000000000000000000000000000000000000..78f85f7e423ed95a1a84779a7c1203e8e5c5f9ba
--- /dev/null
+++ b/tools/telemetry/third_party/coverage/coverage/ctracer/datastack.h
@@ -0,0 +1,45 @@
+/* Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 */
+/* For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt */
+
+#ifndef _COVERAGE_DATASTACK_H
+#define _COVERAGE_DATASTACK_H
+
+#include "util.h"
+#include "stats.h"
+
+/* An entry on the data stack.  For each call frame, we need to record all
+ * the information needed for CTracer_handle_line to operate as quickly as
+ * possible.  All PyObject* here are borrowed references.
+ */
+typedef struct DataStackEntry {
+    /* The current file_data dictionary.  Borrowed, owned by self->data. */
+    PyObject * file_data;
+
+    /* The disposition object for this frame. If collector.py and control.py
+     * are working properly, this will be an instance of CFileDisposition.
+     */
+    PyObject * disposition;
+
+    /* The FileTracer handling this frame, or None if it's Python. */
+    PyObject * file_tracer;
+
+    /* The line number of the last line recorded, for tracing arcs.
+        -1 means there was no previous line, as when entering a code object.
+    */
+    int last_line;
+} DataStackEntry;
+
+/* A data stack is a dynamically allocated vector of DataStackEntry's. */
+typedef struct DataStack {
+    int depth;      /* The index of the last-used entry in stack. */
+    int alloc;      /* number of entries allocated at stack. */
+    /* The file data at each level, or NULL if not recording. */
+    DataStackEntry * stack;
+} DataStack;
+
+
+int DataStack_init(Stats * pstats, DataStack *pdata_stack);
+void DataStack_dealloc(Stats * pstats, DataStack *pdata_stack);
+int DataStack_grow(Stats * pstats, DataStack *pdata_stack);
+
+#endif /* _COVERAGE_DATASTACK_H */