commit 45904e4889603ee7ce6c34d13b5110c21423e495
author Treehugger Robot <treehugger-gerrit@google.com> Thu May 02 13:34:55 2019 +0000
committer Gerrit Code Review <noreply-gerritcodereview@google.com> Thu May 02 13:34:55 2019 +0000
tree 1e4ce50cfcb5c8e085899937f63050c457fa71c2
parent 98dad9323e954217a14dc625b6b821a566956f63
parent 01aa792b5f22010d561109e37b59b13e8da423d3

Merge "Explicitly intern the empty string as 0."

src/profiling/memory/bookkeeping.h

diff --git a/src/profiling/memory/bookkeeping.h b/src/profiling/memory/bookkeeping.h
index 1559459..3ce98df 100644
--- a/src/profiling/memory/bookkeeping.h
+++ b/src/profiling/memory/bookkeeping.h
@@ -208,6 +208,13 @@
     current_trace_packet = trace_writer->NewTracePacket();
     current_profile_packet = current_trace_packet->set_profile_packet();
     current_profile_packet->set_index((*next_index)++);
+
+    // Explicitly reserve intern ID 0 for the empty string, so unset string
+    // fields get mapped to this.
+    auto interned_string = current_profile_packet->add_strings();
+    constexpr const uint8_t kEmptyString[] = "";
+    interned_string->set_id(0);
+    interned_string->set_str(kEmptyString, 0);
   }
 
   void WriteMap(const Interned<Mapping> map);