[PATCH] D60792: Time profiler: optimize json output time

[Anton Afanasyev via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL358522: Time profiler: optimize json output time (authored by anton-afanasyev, committed by ).
Herald added a subscriber: kristina.

Changed prior to commit:
  https://reviews.llvm.org/D60792?vs=195447&id=195450#toc

Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D60792/new/

https://reviews.llvm.org/D60792

Files:
  llvm/trunk/lib/Support/TimeProfiler.cpp


Index: llvm/trunk/lib/Support/TimeProfiler.cpp
===================================================================
--- llvm/trunk/lib/Support/TimeProfiler.cpp
+++ llvm/trunk/lib/Support/TimeProfiler.cpp
@@ -89,6 +89,9 @@
            "All profiler sections should be ended when calling Write");
 
     json::Array Events;
+    const size_t ExpectedEntryCount =
+        Entries.size() + CountAndTotalPerName.size() + 1;
+    Events.reserve(ExpectedEntryCount);
 
     // Emit all events for the main flame graph.
     for (const auto &E : Entries) {
@@ -149,6 +152,8 @@
         {"args", json::Object{{"name", "clang"}}},
     });
 
+    assert(Events.size() == ExpectedEntryCount && "Size prediction failed!");
+
     OS << formatv("{0:2}", json::Value(json::Object(
                                {{"traceEvents", std::move(Events)}})));
   }


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