[runtime] Add function for printing type profile.

Separate the function that prints type profile with
--type-profile from the one that collects type profile.

The name needs to be stored in the feedback vector as well. I'll make a
follow up CL that stores the relevant information, so it can
be printed later.

BUG=v8:5935
R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2757993002
Cr-Commit-Position: refs/heads/master@{#43929}

src/runtime/runtime-object.cc

@@ -710,10 +710,6 @@ RUNTIME_FUNCTION(Runtime_CollectTypeProfile) {
   CollectTypeProfileNexus nexus(vector, vector->ToSlot(index));
   nexus.Collect(type);
 
-  PrintF("%s\n", name->ToCString().get());
-  nexus.Print();
-  PrintF("\n");
-
   return *name;
 }
 

src/runtime/runtime-test.cc

@@ -156,6 +156,35 @@ RUNTIME_FUNCTION(Runtime_IsConcurrentRecompilationSupported) {
       isolate->concurrent_recompilation_enabled());
 }
 
+RUNTIME_FUNCTION(Runtime_PrintTypeProfile) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(1, args.length());
+
+  if (!FLAG_type_profile) {
+    return isolate->heap()->undefined_value();
+  }
+
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
+  if (function->has_feedback_vector()) {
+    FeedbackVector* vector = function->feedback_vector();
+
+    Object* function_name = vector->shared_function_info()->name();
+    PrintF("Function: %s\n", String::cast(function_name)->ToCString().get());
+
+    FeedbackMetadataIterator iter(vector->metadata());
+    while (iter.HasNext()) {
+      FeedbackSlot slot = iter.Next();
+      FeedbackSlotKind kind = iter.kind();
+      if (kind == FeedbackSlotKind::kTypeProfile) {
+        CollectTypeProfileNexus nexus(vector, slot);
+        nexus.Print();
+        PrintF("\n");
+        return isolate->heap()->undefined_value();
+      }
+    }
+  }
+  return isolate->heap()->undefined_value();
+}
 
 RUNTIME_FUNCTION(Runtime_OptimizeFunctionOnNextCall) {
   HandleScope scope(isolate);

src/runtime/runtime.h

@@ -551,6 +551,7 @@ namespace internal {
   F(RunningInSimulator, 0, 1)                 \
   F(IsConcurrentRecompilationSupported, 0, 1) \
   F(OptimizeFunctionOnNextCall, -1, 1)        \
+  F(PrintTypeProfile, 1, 1)                   \
   F(InterpretFunctionOnNextCall, 1, 1)        \
   F(BaselineFunctionOnNextCall, 1, 1)         \
   F(OptimizeOsr, -1, 1)                       \

test/message/type-profile/collect-type-profile.js

@@ -2,22 +2,28 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --type-profile --turbo
+// Flags: --type-profile --turbo --allow-natives-syntax
 
 function test(param) {
   var my_var1 = param;
   var my_var2 = 17;
 }
 
+%PrintTypeProfile(test);
+
 test({});
 test(123);
 test('hello');
 test(123);
+%PrintTypeProfile(test);
+
 test(undefined);
 test('hello');
 test({x: 12});
 test({x: 12});
 
+%PrintTypeProfile(test);
+
 class MyClass {
   constructor() {}
 }

test/message/type-profile/collect-type-profile.out

-my_var1
-Object
-
-my_var2
-number
-
-my_var1
-Object
-number
-
-my_var2
-number
-number
-
-my_var1
-Object
-number
-string
-
-my_var2
-number
-number
-number
-
-my_var1
-Object
-number
-string
-number
-
-my_var2
-number
-number
-number
-number
-
-my_var1
+Function: test
 Object
 number
 string
 number
-undefined
 
-my_var2
-number
-number
-number
-number
-number
-
-my_var1
+Function: test
 Object
 number
 string
 number
 undefined
 string
-
-my_var2
-number
-number
-number
-number
-number
-number
-
-my_var1
 Object
-number
-string
-number
-undefined
-string
 Object
 
-my_var2
-number
-number
-number
-number
-number
-number
-number
-
-my_var1
-Object
-number
-string
-number
-undefined
-string
-Object
-Object
-
-my_var2
-number
-number
-number
-number
-number
-number
-number
-number
-
-
-Function
-
-MyClass
-Function
-
-my_var
-MyClass
-
-my_var
-MyClass
-Object
-
-my_var
-MyClass
-Object
-number
-
-*%(basename)s:34: throw otherwise test fails with --stress-opt
+*%(basename)s:40: throw otherwise test fails with --stress-opt
 throw "throw otherwise test fails with --stress-opt";
 ^