[Interpreter] Add dispatch counters for each bytecode.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 7afc7108992966987638707afcea503fc5f88f8c..356225b3a20959317b6b9e64aae9c4e92a983dc8 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -296,6 +296,11 @@ DEFINE_BOOL(trace_ignition, false,
             "trace the bytecodes executed by the ignition interpreter")
 DEFINE_BOOL(trace_ignition_codegen, false,
             "trace the codegen of ignition interpreter bytecode handlers")
+DEFINE_BOOL(ignition_count_handler_dispatches, false,

[rmcilroy, 2016/04/05 10:00:45]

trace_ignition_dispatches

[Stefano Sanfilippo, 2016/04/05 14:01:45]

Done.

+            "count dispatches to each handler")

[rmcilroy, 2016/04/05 10:00:45]

traces the dispatches to bytecode handlers by the ignition interpreter

[Stefano Sanfilippo, 2016/04/05 14:01:46]

Done.

+DEFINE_STRING(ignition_handler_to_handler_output_file,

[rmcilroy, 2016/04/05 10:00:45]

trace_ignition_dispatches_output_file

[Stefano Sanfilippo, 2016/04/05 14:01:46]

Done.

+              "v8.dispatch_counters_table.json",

[rmcilroy, 2016/04/05 10:00:45]

v8.ignition_dispatches_table.json

[Stefano Sanfilippo, 2016/04/05 14:01:46]

Done.

+              "file to write the handler to handler dispatch counters table to")

[rmcilroy, 2016/04/05 10:00:45]

the file to which the bytecode handler dispatch table is written

[Stefano Sanfilippo, 2016/04/05 14:01:45]

Done.

 
 // Flags for Crankshaft.
 DEFINE_BOOL(crankshaft, true, "use crankshaft")