[Interpreter]: Basic support for iterating interpreter stack frames for GC.

src/objects-inl.h

 // 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 4976 matching lines @@
 bool Code::IsCodeStubOrIC() {
   return kind() == STUB || kind() == HANDLER || kind() == LOAD_IC ||
          kind() == KEYED_LOAD_IC || kind() == CALL_IC || kind() == STORE_IC ||
          kind() == KEYED_STORE_IC || kind() == BINARY_OP_IC ||
          kind() == COMPARE_IC || kind() == COMPARE_NIL_IC ||
          kind() == TO_BOOLEAN_IC;
 }
 
 
 bool Code::IsJavaScriptCode() {
-  if (kind() == FUNCTION || kind() == OPTIMIZED_FUNCTION) {
-    return true;
-  }
-  Handle<Code> interpreter_entry =
-      GetIsolate()->builtins()->InterpreterEntryTrampoline();
-  return interpreter_entry.location() != nullptr && *interpreter_entry == this;
+  return kind() == FUNCTION || kind() == OPTIMIZED_FUNCTION ||
+         is_interpreter_entry_trampoline();
 }
 
 
 InlineCacheState Code::ic_state() {
   InlineCacheState result = ExtractICStateFromFlags(flags());
   // Only allow uninitialized or debugger states for non-IC code
   // objects. This is used in the debugger to determine whether or not
   // a call to code object has been replaced with a debug break call.
   DCHECK(is_inline_cache_stub() ||
          result == UNINITIALIZED ||
@@ skipping 28 matching lines @@
   return IsCrankshaftedField::decode(
       READ_UINT32_FIELD(this, kKindSpecificFlags2Offset));
 }
 
 
 inline bool Code::is_hydrogen_stub() {
   return is_crankshafted() && kind() != OPTIMIZED_FUNCTION;
 }
 
 
+inline bool Code::is_interpreter_entry_trampoline() {
+  Handle<Code> interpreter_entry =
+      GetIsolate()->builtins()->InterpreterEntryTrampoline();
+  return interpreter_entry.location() != nullptr && *interpreter_entry == this;
+}
+
 inline void Code::set_is_crankshafted(bool value) {
   int previous = READ_UINT32_FIELD(this, kKindSpecificFlags2Offset);
   int updated = IsCrankshaftedField::update(previous, value);
   WRITE_UINT32_FIELD(this, kKindSpecificFlags2Offset, updated);
 }
 
 
 inline bool Code::is_turbofanned() {
   return IsTurbofannedField::decode(
       READ_UINT32_FIELD(this, kKindSpecificFlags1Offset));
@@ skipping 3066 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_