[Interpreter] Add dispatch counters for each bytecode.

src/d8.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.
 
 
 // Defined when linking against shared lib on Windows.
 #if defined(USING_V8_SHARED) && !defined(V8_SHARED)
 #define V8_SHARED
 #endif
 
 #include <errno.h>
+#include <inttypes.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
 
 #ifdef V8_SHARED
 #include <assert.h>
 #endif  // V8_SHARED
 
 #ifndef V8_SHARED
 #include <algorithm>
@@ skipping 12 matching lines @@
 #include "src/ostreams.h"
 
 #include "include/libplatform/libplatform.h"
 #ifndef V8_SHARED
 #include "src/api.h"
 #include "src/base/cpu.h"
 #include "src/base/logging.h"
 #include "src/base/platform/platform.h"
 #include "src/base/sys-info.h"
 #include "src/basic-block-profiler.h"
+#include "src/interpreter/interpreter.h"
 #include "src/snapshot/natives.h"
 #include "src/utils.h"
 #include "src/v8.h"
 #endif  // !V8_SHARED
 
 #if !defined(_WIN32) && !defined(_WIN64)
 #include <unistd.h>  // NOLINT
 #else
 #include <windows.h>  // NOLINT
 #if defined(_MSC_VER)
@@ skipping 1274 matching lines @@
     for (j = 0; j < number_of_counters; j++) {
       Counter* counter = counters[j].counter;
       const char* key = counters[j].key;
       if (counter->is_histogram()) {
         printf("| c:%-60s | %11i |\n", key, counter->count());
         printf("| t:%-60s | %11i |\n", key, counter->sample_total());
       } else {
         printf("| %-62s | %11i |\n", key, counter->count());
       }
     }
+    if (i::FLAG_ignition_count_handler_dispatches) {
+      uint32_t* handler_dispatch_counters =
+          reinterpret_cast<i::Isolate*>(isolate)
+              ->interpreter()
+              ->handlers_dispatch_counters();
+      for (int i = 0; i <= static_cast<int>(i::interpreter::Bytecode::kLast);
+           ++i) {
+        i::interpreter::Bytecode bytecode =
+            i::interpreter::Bytecodes::FromByte(i);
+        printf("| c:V8.Ignition_DispatchCounter_%-32s | %11" PRIu32 " |\n",
+               i::interpreter::Bytecodes::ToString(bytecode),
+               handler_dispatch_counters[i]);
+      }
+    }

[rmcilroy, 2016/03/23 11:04:26]

As discussed, maybe we could output json for this case too. Is there anywhere we
could put this where it wouldn't be d8 specific (i.e., could be used by Chrome
too?

[Stefano Sanfilippo, 2016/03/23 16:26:26]

Done JSON. As of where to move this, I'll start by extracting a function to do
the job, which does not depend on anything Shell specific, so we are free to
move it wherever it seems more appropriate.

     printf("+----------------------------------------------------------------+"
            "-------------+\n");
     delete [] counters;
   }
   delete counters_file_;
   delete counter_map_;
 #endif  // !V8_SHARED
 }
 
 
@@ skipping 1185 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif