CPU profiler: limit the number of simultaneously collected profiles.

test/cctest/test-profile-generator.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 //
 // Tests of profiles generator and utilities.
 
 #ifdef ENABLE_LOGGING_AND_PROFILING
 
 #include "v8.h"
 #include "profile-generator-inl.h"
 #include "cctest.h"
 #include "../include/v8-profiler.h"
@@ skipping 757 matching lines @@
   CHECK_NE(NULL, const_cast<ProfileNode*>(current));
   current = PickChild(current, "a");
   CHECK_NE(NULL, const_cast<ProfileNode*>(current));
   current = PickChild(current, "b");
   CHECK_NE(NULL, const_cast<ProfileNode*>(current));
   current = PickChild(current, "c");
   CHECK_NE(NULL, const_cast<ProfileNode*>(current));
   CHECK_EQ(0, current->children()->length());
 }
 
+
+TEST(Issue51919) {
+  CpuProfilesCollection collection;
+  i::EmbeddedVector<char*,
+      CpuProfilesCollection::kMaxSimultaneousProfiles> titles;
+  for (int i = 0; i < CpuProfilesCollection::kMaxSimultaneousProfiles; ++i) {
+    i::Vector<char> title = i::Vector<char>::New(16);
+    i::OS::SNPrintF(title, "%d", i);
+    CHECK(collection.StartProfiling(title.start(), i + 1));  // UID must be > 0.
+    titles[i] = title.start();
+  }
+  CHECK(!collection.StartProfiling(
+      "maximum", CpuProfilesCollection::kMaxSimultaneousProfiles + 1));
+  for (int i = 0; i < CpuProfilesCollection::kMaxSimultaneousProfiles; ++i)
+    i::DeleteArray(titles[i]);
+}
+
 #endif  // ENABLE_LOGGING_AND_PROFILING