Add name inference for anonymous functions to facilitate debugging and profiling of JS code.

src/func-name-inferrer.cc

Index: src/func-name-inferrer.cc
diff --git a/src/func-name-inferrer.cc b/src/func-name-inferrer.cc
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+++ b/src/func-name-inferrer.cc
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+// Copyright 2009 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "v8.h"
+
+#include "ast.h"
+#include "func-name-inferrer.h"
+
+namespace v8 { namespace internal {
+
+
+void FuncNameInferrer::PushEnclosingName(Handle<String> 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->length() > 0 && Runtime::IsUpperCaseChar(name->Get(0))) {
+    names_stack_.Add(name);
+  }
+}
+
+
+Handle<String> FuncNameInferrer::MakeNameFromStack() {
+  if (names_stack_.is_empty()) {
+    return Factory::empty_string();
+  } else {
+    return MakeNameFromStackHelper(1, names_stack_.at(0));
+  }
+}
+
+
+Handle<String> FuncNameInferrer::MakeNameFromStackHelper(int pos,
+                                                         Handle<String> prev) {
+  if (pos >= names_stack_.length()) {
+    return prev;
+  } else {
+    Handle<String> curr = Factory::NewConsString(dot_, names_stack_.at(pos));
+    return MakeNameFromStackHelper(pos + 1, Factory::NewConsString(prev, curr));
+  }
+}
+
+
+void FuncNameInferrer::MaybeInferFunctionName() {
+  if (func_to_infer_ != NULL) {
+    func_to_infer_->set_inferred_name(MakeNameFromStack());
+    func_to_infer_ = NULL;
+  }
+}
+
+
+} }  // namespace v8::internal