1 files changed, 85 insertions, 0 deletions
diff --git a/deps/v8/src/parsing/func-name-inferrer.cc b/deps/v8/src/parsing/func-name-inferrer.cc
new file mode 100644
index 0000000000..12013afd28
--- /dev/null
+++ b/deps/v8/src/parsing/func-name-inferrer.cc
@@ -0,0 +1,85 @@
+// Copyright 2011 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.
+
+#include "src/parsing/func-name-inferrer.h"
+
+#include "src/ast/ast.h"
+#include "src/ast/ast-value-factory.h"
+#include "src/list-inl.h"
+
+namespace v8 {
+namespace internal {
+
+FuncNameInferrer::FuncNameInferrer(AstValueFactory* ast_value_factory,
+                                   Zone* zone)
+    : ast_value_factory_(ast_value_factory),
+      entries_stack_(10, zone),
+      names_stack_(5, zone),
+      funcs_to_infer_(4, zone),
+      zone_(zone) {
+}
+
+
+void FuncNameInferrer::PushEnclosingName(const AstRawString* name) {
+  // Enclosing name is a name of a constructor function. To check
+  // that it is really a constructor, we check that it is not empty
+  // and starts with a capital letter.
+  if (!name->IsEmpty() && unibrow::Uppercase::Is(name->FirstCharacter())) {
+    names_stack_.Add(Name(name, kEnclosingConstructorName), zone());
+  }
+}
+
+
+void FuncNameInferrer::PushLiteralName(const AstRawString* name) {
+  if (IsOpen() && name != ast_value_factory_->prototype_string()) {
+    names_stack_.Add(Name(name, kLiteralName), zone());
+  }
+}
+
+
+void FuncNameInferrer::PushVariableName(const AstRawString* name) {
+  if (IsOpen() && name != ast_value_factory_->dot_result_string()) {
+    names_stack_.Add(Name(name, kVariableName), zone());
+  }
+}
+
+
+const AstString* FuncNameInferrer::MakeNameFromStack() {
+  return MakeNameFromStackHelper(0, ast_value_factory_->empty_string());
+}
+
+const AstString* FuncNameInferrer::MakeNameFromStackHelper(
+    int pos, const AstString* prev) {
+  if (pos >= names_stack_.length()) return prev;
+  if (pos < names_stack_.length() - 1 &&
+      names_stack_.at(pos).type == kVariableName &&
+      names_stack_.at(pos + 1).type == kVariableName) {
+    // Skip consecutive variable declarations.
+    return MakeNameFromStackHelper(pos + 1, prev);
+  } else {
+    if (prev->length() > 0) {
+      const AstRawString* name = names_stack_.at(pos).name;
+      if (prev->length() + name->length() + 1 > String::kMaxLength) return prev;
+      const AstConsString* curr = ast_value_factory_->NewConsString(
+          ast_value_factory_->dot_string(), name);
+      curr = ast_value_factory_->NewConsString(prev, curr);
+      return MakeNameFromStackHelper(pos + 1, curr);
+    } else {
+      return MakeNameFromStackHelper(pos + 1, names_stack_.at(pos).name);
+    }
+  }
+}
+
+
+void FuncNameInferrer::InferFunctionsNames() {
+  const AstString* func_name = MakeNameFromStack();
+  for (int i = 0; i < funcs_to_infer_.length(); ++i) {
+    funcs_to_infer_[i]->set_raw_inferred_name(func_name);
+  }
+  funcs_to_infer_.Rewind(0);
+}
+
+
+}  // namespace internal
+}  // namespace v8