Collect type profile for DevTools.

src/interpreter/bytecode-array-builder.h

 // Copyright 2015 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.
 
 #ifndef V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
 #define V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
 
 #include "src/ast/ast.h"
 #include "src/base/compiler-specific.h"
 #include "src/globals.h"
@@ skipping 119 matching lines @@
   // Named load property of the @@asyncIterator symbol.
   BytecodeArrayBuilder& LoadAsyncIteratorProperty(Register object,
                                                   int feedback_slot);
 
   // Store properties. Flag for NeedsSetFunctionName() should
   // be in the accumulator.
   BytecodeArrayBuilder& StoreDataPropertyInLiteral(
       Register object, Register name, DataPropertyInLiteralFlags flags,
       int feedback_slot);
 
+  // Collect type information for developer tools. The value for which we
+  // record the type is stored in the accumulator.
+  // TODO(franzih): Do not pass the name, instead use the source position.

[rmcilroy, 2017/03/13 10:50:59]

Any not to use source position now? This would probably make the changes in
VisitAssignment much simpler (since the source position could be an immediate,
so no need to allocate a register and get the name differently depending on LHS.
Fine with landing this as-is if you want to iterate before doing this though. 

[Franzi, 2017/03/13 12:01:56]

I'll land as is to keep CL somewhat shorter. 

+  BytecodeArrayBuilder& CollectTypeProfile(Register name, int feedback_slot);
+
   // Store a property named by a property name. The value to be stored should be
   // in the accumulator.
   BytecodeArrayBuilder& StoreNamedProperty(Register object,
                                            const AstRawString* name,
                                            int feedback_slot,
                                            LanguageMode language_mode);
   // Store a property named by a constant from the constant pool. The value to
   // be stored should be in the accumulator.
   BytecodeArrayBuilder& StoreNamedProperty(Register object,
                                            size_t constant_pool_entry,
@@ skipping 332 matching lines @@
   static int const kNoFeedbackSlot = 0;
 
   DISALLOW_COPY_AND_ASSIGN(BytecodeArrayBuilder);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_