[interpreter] Add support for scalable operands.

src/log.cc

Index: src/log.cc
diff --git a/src/log.cc b/src/log.cc
index e520ff6aed04aada83d0aacf5b0231ca36bef32f..c07717166a5c8aa6725d23f581e9d288390c94a8 100644
--- a/src/log.cc
+++ b/src/log.cc
@@ -1608,11 +1608,26 @@ void Logger::LogBytecodeHandlers() {
   if (!FLAG_ignition) return;
 
   const int last_index = static_cast<int>(interpreter::Bytecode::kLast);
-  for (int index = 0; index <= last_index; ++index) {
-    interpreter::Bytecode bytecode = interpreter::Bytecodes::FromByte(index);
-    Code* code = isolate_->interpreter()->GetBytecodeHandler(bytecode);
-    CodeCreateEvent(Logger::BYTECODE_HANDLER_TAG, AbstractCode::cast(code),
-                    interpreter::Bytecodes::ToString(bytecode));
+  for (int operand_scale = 1; operand_scale <= 4; operand_scale *= 2) {
+    for (int index = 0; index <= last_index; ++index) {
+      interpreter::Bytecode bytecode = interpreter::Bytecodes::FromByte(index);
+      Code* code =
+          isolate_->interpreter()->GetBytecodeHandler(bytecode, operand_scale);
+      if (code != nullptr) {
+        std::string bytecode_name = interpreter::Bytecodes::ToString(bytecode);

[rmcilroy, 2016/03/10 16:45:38]

How about making Bytecode::ToString take a width too and also do the prepending
of .Wide / .ExtraWide itself?

[oth, 2016/03/11 16:26:13]

Added an overload to do this.

+        if (operand_scale == 2) {
+          bytecode_name += ".";
+          bytecode_name +=
+              interpreter::Bytecodes::ToString(interpreter::Bytecode::kWide);
+        } else if (operand_scale == 4) {
+          bytecode_name += ".";
+          bytecode_name += interpreter::Bytecodes::ToString(
+              interpreter::Bytecode::kExtraWide);
+        }
+        CodeCreateEvent(Logger::BYTECODE_HANDLER_TAG, AbstractCode::cast(code),
+                        bytecode_name.c_str());
+      }
+    }
   }
 }