Even without --trace-gc dump the last few GC messages on OOM

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 195 matching lines @@
 
 
 void i::FatalProcessOutOfMemory(const char* location) {
   i::V8::FatalProcessOutOfMemory(location, false);
 }
 
 
 // When V8 cannot allocated memory FatalProcessOutOfMemory is called.
 // The default fatal error handler is called and execution is stopped.
 void i::V8::FatalProcessOutOfMemory(const char* location, bool take_snapshot) {
+  i::Isolate* isolate = i::Isolate::Current();
+  char last_few_messages[Heap::kTraceRingBufferSize + 1];
+  memset(last_few_messages, 0, Heap::kTraceRingBufferSize + 1);
+
   i::HeapStats heap_stats;
   int start_marker;
   heap_stats.start_marker = &start_marker;
   int new_space_size;
   heap_stats.new_space_size = &new_space_size;
   int new_space_capacity;
   heap_stats.new_space_capacity = &new_space_capacity;
   intptr_t old_space_size;
   heap_stats.old_space_size = &old_space_size;
   intptr_t old_space_capacity;
@@ skipping 21 matching lines @@
   intptr_t memory_allocator_size;
   heap_stats.memory_allocator_size = &memory_allocator_size;
   intptr_t memory_allocator_capacity;
   heap_stats.memory_allocator_capacity = &memory_allocator_capacity;
   int objects_per_type[LAST_TYPE + 1] = {0};
   heap_stats.objects_per_type = objects_per_type;
   int size_per_type[LAST_TYPE + 1] = {0};
   heap_stats.size_per_type = size_per_type;
   int os_error;
   heap_stats.os_error = &os_error;
+  heap_stats.last_few_messages = last_few_messages;
   int end_marker;
   heap_stats.end_marker = &end_marker;
-  i::Isolate* isolate = i::Isolate::Current();
   if (isolate->heap()->HasBeenSetUp()) {
     // BUG(1718): Don't use the take_snapshot since we don't support
     // HeapIterator here without doing a special GC.
     isolate->heap()->RecordStats(&heap_stats, false);
+    char* first_newline = strchr(last_few_messages, '\n');
+    if (first_newline == NULL || first_newline[1] == '\0')
+      first_newline = last_few_messages;
+    PrintF("\n<--- Last few GCs --->\n%s\n", first_newline);
   }
   Utils::ApiCheck(false, location, "Allocation failed - process out of memory");
   // If the fatal error handler returns, we stop execution.
   FATAL("API fatal error handler returned after process out of memory");
 }
 
 
 void Utils::ReportApiFailure(const char* location, const char* message) {
   i::Isolate* isolate = i::Isolate::Current();
   FatalErrorCallback callback = isolate->exception_behavior();
@@ skipping 7747 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal