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

Currently function name inference is wired with AST optimization pass to avoid introducing another pass over AST. A better solution would be to rewrite AST visitors so they can be naturally combined together in a single pass, as their current implementation doesn't allow it.

For examples of cases where function names can be inferred, see the tests file.

Review URL: http://codereview.chromium.org/62146

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1696 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/SConscript

@@ -40,7 +40,8 @@ SOURCES = {
     'codegen.cc', 'compilation-cache.cc', 'compiler.cc', 'contexts.cc',
     'conversions.cc', 'counters.cc', 'dateparser.cc', 'debug.cc',
     'debug-agent.cc', 'disassembler.cc', 'execution.cc', 'factory.cc',
-    'flags.cc', 'frames.cc', 'global-handles.cc', 'handles.cc', 'hashmap.cc',
+    'flags.cc', 'frames.cc', 'func-name-inferrer.cc',
+    'global-handles.cc', 'handles.cc', 'hashmap.cc',
     'heap.cc', 'ic.cc', 'interpreter-irregexp.cc', 'jsregexp.cc',
     'jump-target.cc', 'log.cc', 'mark-compact.cc', 'messages.cc', 'objects.cc',
     'oprofile-agent.cc', 'parser.cc', 'property.cc', 'regexp-macro-assembler.cc',

src/ast.h

@@ -1223,7 +1223,8 @@ class FunctionLiteral: public Expression {
         end_position_(end_position),
         is_expression_(is_expression),
         loop_nesting_(0),
-        function_token_position_(RelocInfo::kNoPosition) {
+        function_token_position_(RelocInfo::kNoPosition),
+        inferred_name_(Heap::empty_string()) {
 #ifdef DEBUG
     already_compiled_ = false;
 #endif
@@ -1253,6 +1254,11 @@ class FunctionLiteral: public Expression {
   bool loop_nesting() const { return loop_nesting_; }
   void set_loop_nesting(int nesting) { loop_nesting_ = nesting; }
 
+  Handle<String> inferred_name() const  { return inferred_name_; }
+  void set_inferred_name(Handle<String> inferred_name) {
+    inferred_name_ = inferred_name;
+  }
+
 #ifdef DEBUG
   void mark_as_compiled() {
     ASSERT(!already_compiled_);
@@ -1273,6 +1279,7 @@ class FunctionLiteral: public Expression {
   bool is_expression_;
   int loop_nesting_;
   int function_token_position_;
+  Handle<String> inferred_name_;
 #ifdef DEBUG
   bool already_compiled_;
 #endif

src/codegen-arm.h

@@ -160,7 +160,8 @@ class CodeGenerator: public AstVisitor {
                               int end_position,
                               bool is_expression,
                               bool is_toplevel,
-                              Handle<Script> script);
+                              Handle<Script> script,
+                              Handle<String> inferred_name);
 
   // Accessors
   MacroAssembler* masm() { return masm_; }

src/codegen-ia32.h

@@ -299,7 +299,8 @@ class CodeGenerator: public AstVisitor {
                               int end_position,
                               bool is_expression,
                               bool is_toplevel,
-                              Handle<Script> script);
+                              Handle<Script> script,
+                              Handle<String> inferred_name);
 
   // Accessors
   MacroAssembler* masm() { return masm_; }

src/codegen.cc

@@ -230,7 +230,8 @@ void CodeGenerator::SetFunctionInfo(Handle<JSFunction> fun,
                                     int end_position,
                                     bool is_expression,
                                     bool is_toplevel,
-                                    Handle<Script> script) {
+                                    Handle<Script> script,
+                                    Handle<String> inferred_name) {
   fun->shared()->set_length(length);
   fun->shared()->set_formal_parameter_count(length);
   fun->shared()->set_script(*script);
@@ -239,6 +240,7 @@ void CodeGenerator::SetFunctionInfo(Handle<JSFunction> fun,
   fun->shared()->set_end_position(end_position);
   fun->shared()->set_is_expression(is_expression);
   fun->shared()->set_is_toplevel(is_toplevel);
+  fun->shared()->set_inferred_name(*inferred_name);
 }
 
 
@@ -299,7 +301,8 @@ Handle<JSFunction> CodeGenerator::BuildBoilerplate(FunctionLiteral* node) {
   CodeGenerator::SetFunctionInfo(function, node->num_parameters(),
                                  node->function_token_position(),
                                  node->start_position(), node->end_position(),
-                                 node->is_expression(), false, script_);
+                                 node->is_expression(), false, script_,
+                                 node->inferred_name());
 
   // Notify debugger that a new function has been added.
   Debugger::OnNewFunction(function);

src/compiler.cc

@@ -152,7 +152,8 @@ static Handle<JSFunction> MakeFunction(bool is_global,
   CodeGenerator::SetFunctionInfo(fun, lit->scope()->num_parameters(),
                                  RelocInfo::kNoPosition,
                                  lit->start_position(), lit->end_position(),
-                                 lit->is_expression(), true, script);
+                                 lit->is_expression(), true, script,
+                                 lit->inferred_name());
 
   // Hint to the runtime system used when allocating space for initial
   // property space by setting the expected number of properties for
@@ -316,20 +317,22 @@ bool Compiler::CompileLazy(Handle<SharedFunctionInfo> shared,
   // name and line number. Check explicit whether logging is enabled as finding
   // the line number is not for free.
   if (Logger::is_enabled() || OProfileAgent::is_enabled()) {
+    Handle<String> func_name(lit->name()->length() > 0 ?
+                             *lit->name() : shared->inferred_name());
     if (script->name()->IsString()) {
       int line_num = GetScriptLineNumber(script, start_position);
       if (line_num > 0) {
         line_num += script->line_offset()->value() + 1;
       }
-      LOG(CodeCreateEvent("LazyCompile", *code, *lit->name(),
+      LOG(CodeCreateEvent("LazyCompile", *code, *func_name,
                           String::cast(script->name()), line_num));
-      OProfileAgent::CreateNativeCodeRegion(*lit->name(),
+      OProfileAgent::CreateNativeCodeRegion(*func_name,
                                             String::cast(script->name()),
                                             line_num, code->address(),
                                             code->ExecutableSize());
     } else {
-      LOG(CodeCreateEvent("LazyCompile", *code, *lit->name()));
-      OProfileAgent::CreateNativeCodeRegion(*lit->name(), code->address(),
+      LOG(CodeCreateEvent("LazyCompile", *code, *func_name));
+      OProfileAgent::CreateNativeCodeRegion(*func_name, code->address(),
                                             code->ExecutableSize());
     }
   }

src/func-name-inferrer.cc

+// 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

src/func-name-inferrer.h

+// Copyright 2006-2009 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.
+
+#ifndef V8_FUNC_NAME_INFERRER_H_
+#define V8_FUNC_NAME_INFERRER_H_
+
+namespace v8 { namespace internal {
+
+// FuncNameInferrer is a stateful class that is used to perform name
+// inference for anonymous functions during static analysis of source code.
+// Inference is performed in cases when an anonymous function is assigned
+// to a variable or a property (see test-func-name-inference.cc for examples.)
+
+// The basic idea is that during AST traversal LHSs of expressions are
+// always visited before RHSs. Thus, during visiting the LHS, a name can be
+// collected, and during visiting the RHS, a function literal can be collected.
+// Inference is performed while leaving the assignment node.
+
+class FuncNameInferrer BASE_EMBEDDED {
+ public:
+  FuncNameInferrer() :
+      entries_stack_(10),
+      names_stack_(5),
+      func_to_infer_(NULL),
+      dot_(Factory::NewStringFromAscii(CStrVector("."))) {
+  }
+
+  bool IsOpen() const { return !entries_stack_.is_empty(); }
+
+  void PushEnclosingName(Handle<String> name);
+
+  void Enter() {
+    entries_stack_.Add(names_stack_.length());
+  }
+
+  void Leave() {
+    ASSERT(IsOpen());
+    names_stack_.Rewind(entries_stack_.RemoveLast());
+  }
+
+  void PushName(Handle<String> name) {
+    if (IsOpen()) {
+      names_stack_.Add(name);
+    }
+  }
+
+  void SetFuncToInfer(FunctionLiteral* func_to_infer) {
+    if (IsOpen()) {
+      ASSERT(func_to_infer_ == NULL);
+      func_to_infer_ = func_to_infer;
+    }
+  }
+
+  void InferAndLeave() {
+    ASSERT(IsOpen());
+    MaybeInferFunctionName();
+    Leave();
+  }
+
+ private:
+  Handle<String> MakeNameFromStack();
+  Handle<String> MakeNameFromStackHelper(int pos, Handle<String> prev);
+  void MaybeInferFunctionName();
+
+  List<int> entries_stack_;
+  List<Handle<String> > names_stack_;
+  FunctionLiteral* func_to_infer_;
+  Handle<String> dot_;
+
+  DISALLOW_COPY_AND_ASSIGN(FuncNameInferrer);
+};
+
+
+// A wrapper class that automatically calls InferAndLeave when
+// leaving scope.
+class ScopedFuncNameInferrer BASE_EMBEDDED {
+ public:
+  ScopedFuncNameInferrer(FuncNameInferrer* inferrer) : inferrer_(inferrer),
+                                                       is_entered_(false) {};
+  ~ScopedFuncNameInferrer() {
+    if (is_entered_) {
+      inferrer_->InferAndLeave();
+    }
+  }
+
+  void Enter() {
+    inferrer_->Enter();
+    is_entered_ = true;
+  }
+
+ private:
+  FuncNameInferrer* inferrer_;
+  bool is_entered_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedFuncNameInferrer);
+};
+
+
+} }  // namespace v8::internal
+
+#endif  // V8_FUNC_NAME_INFERRER_H_

src/heap.cc

@@ -1384,6 +1384,7 @@ Object* Heap::AllocateSharedFunctionInfo(Object* name) {
   share->set_script(undefined_value());
   share->set_start_position_and_type(0);
   share->set_debug_info(undefined_value());
+  share->set_inferred_name(empty_string());
   return result;
 }
 

src/objects-inl.h

@@ -2077,6 +2077,7 @@ ACCESSORS(SharedFunctionInfo, function_data, Object,
 ACCESSORS(SharedFunctionInfo, lazy_load_data, Object, kLazyLoadDataOffset)
 ACCESSORS(SharedFunctionInfo, script, Object, kScriptOffset)
 ACCESSORS(SharedFunctionInfo, debug_info, Object, kDebugInfoOffset)
+ACCESSORS(SharedFunctionInfo, inferred_name, String, kInferredNameOffset)
 
 BOOL_ACCESSORS(FunctionTemplateInfo, flag, hidden_prototype,
                kHiddenPrototypeBit)

src/objects.cc

@@ -4641,7 +4641,7 @@ void SharedFunctionInfo::SourceCodePrint(StringStream* accumulator,
 void SharedFunctionInfo::SharedFunctionInfoIterateBody(ObjectVisitor* v) {
   IteratePointers(v, kNameOffset, kCodeOffset + kPointerSize);
   IteratePointers(v, kInstanceClassNameOffset, kScriptOffset + kPointerSize);
-  IteratePointer(v, kDebugInfoOffset);
+  IteratePointers(v, kDebugInfoOffset, kInferredNameOffset + kPointerSize);
 }
 
 

src/objects.h

@@ -2665,6 +2665,13 @@ class SharedFunctionInfo: public HeapObject {
   // [debug info]: Debug information.
   DECL_ACCESSORS(debug_info, Object)
 
+  // [inferred name]: Name inferred from variable or property
+  // assignment of this function. Used to facilitate debugging and
+  // profiling of JavaScript code written in OO style, where almost
+  // all functions are anonymous but are assigned to object
+  // properties.
+  DECL_ACCESSORS(inferred_name, String)
+
   // Position of the 'function' token in the script source.
   inline int function_token_position();
   inline void set_function_token_position(int function_token_position);
@@ -2724,7 +2731,8 @@ class SharedFunctionInfo: public HeapObject {
   static const int kEndPositionOffset = kStartPositionAndTypeOffset + kIntSize;
   static const int kFunctionTokenPositionOffset = kEndPositionOffset + kIntSize;
   static const int kDebugInfoOffset = kFunctionTokenPositionOffset + kIntSize;
-  static const int kSize = kDebugInfoOffset + kPointerSize;
+  static const int kInferredNameOffset = kDebugInfoOffset + kPointerSize;
+  static const int kSize = kInferredNameOffset + kPointerSize;
 
  private:
   // Bit positions in length_and_flg.

src/prettyprinter.cc

@@ -709,6 +709,7 @@ const char* AstPrinter::PrintProgram(FunctionLiteral* program) {
   Init();
   { IndentedScope indent("FUNC");
     PrintLiteralIndented("NAME", program->name(), true);
+    PrintLiteralIndented("INFERRED NAME", program->inferred_name(), true);
     PrintParameters(program->scope());
     PrintDeclarations(program->scope()->declarations());
     PrintStatements(program->body());
@@ -885,6 +886,7 @@ void AstPrinter::VisitDebuggerStatement(DebuggerStatement* node) {
 void AstPrinter::VisitFunctionLiteral(FunctionLiteral* node) {
   IndentedScope indent("FUNC LITERAL");
   PrintLiteralIndented("NAME", node->name(), false);
+  PrintLiteralIndented("INFERRED NAME", node->inferred_name(), false);
   PrintParameters(node->scope());
   // We don't want to see the function literal in this case: it
   // will be printed via PrintProgram when the code for it is

src/rewriter.cc

@@ -28,6 +28,7 @@
 #include "v8.h"
 
 #include "ast.h"
+#include "func-name-inferrer.h"
 #include "scopes.h"
 #include "rewriter.h"
 
@@ -36,7 +37,9 @@ namespace v8 { namespace internal {
 
 class AstOptimizer: public AstVisitor {
  public:
-  explicit AstOptimizer() {
+  explicit AstOptimizer() {}
+  explicit AstOptimizer(Handle<String> enclosing_name) {
+    func_name_inferrer_.PushEnclosingName(enclosing_name);
   }
 
   void Optimize(ZoneList<Statement*>* statements);
@@ -45,6 +48,8 @@ class AstOptimizer: public AstVisitor {
   // Used for loop condition analysis.  Cleared before visiting a loop
   // condition, set when a function literal is visited.
   bool has_function_literal_;
+  // Helper object for function name inferring.
+  FuncNameInferrer func_name_inferrer_;
 
   // Helpers
   void OptimizeArguments(ZoneList<Expression*>* arguments);
@@ -185,8 +190,12 @@ void AstOptimizer::VisitDebuggerStatement(DebuggerStatement* node) {
 
 
 void AstOptimizer::VisitFunctionLiteral(FunctionLiteral* node) {
-  USE(node);
   has_function_literal_ = true;
+
+  if (node->name()->length() == 0) {
+    // Anonymous function.
+    func_name_inferrer_.SetFuncToInfer(node);
+  }
 }
 
 
@@ -216,6 +225,11 @@ void AstOptimizer::VisitVariableProxy(VariableProxy* node) {
     } else if (node->type()->IsLikelySmi()) {
       var->type()->SetAsLikelySmi();
     }
+
+    if (!var->is_this() &&
+        !Heap::result_symbol()->Equals(*var->name())) {
+      func_name_inferrer_.PushName(var->name());
+    }
   }
 }
 
@@ -224,6 +238,11 @@ void AstOptimizer::VisitLiteral(Literal* node) {
   Handle<Object> literal = node->handle();
   if (literal->IsSmi()) {
     node->type()->SetAsLikelySmi();
+  } else if (literal->IsString()) {
+    Handle<String> lit_str(Handle<String>::cast(literal));
+    if (!Heap::prototype_symbol()->Equals(*lit_str)) {
+      func_name_inferrer_.PushName(lit_str);
+    }
   }
 }
 
@@ -239,9 +258,10 @@ void AstOptimizer::VisitArrayLiteral(ArrayLiteral* node) {
   }
 }
 
-
 void AstOptimizer::VisitObjectLiteral(ObjectLiteral* node) {
   for (int i = 0; i < node->properties()->length(); i++) {
+    ScopedFuncNameInferrer scoped_fni(&func_name_inferrer_);
+    scoped_fni.Enter();
     Visit(node->properties()->at(i)->key());
     Visit(node->properties()->at(i)->value());
   }
@@ -255,11 +275,17 @@ void AstOptimizer::VisitCatchExtensionObject(CatchExtensionObject* node) {
 
 
 void AstOptimizer::VisitAssignment(Assignment* node) {
+  ScopedFuncNameInferrer scoped_fni(&func_name_inferrer_);
   switch (node->op()) {
     case Token::INIT_VAR:
     case Token::INIT_CONST:
     case Token::ASSIGN:
       // No type can be infered from the general assignment.
+
+      if (node->value()->AsFunctionLiteral() != NULL ||
+          node->value()->AsObjectLiteral() != NULL) {
+        scoped_fni.Enter();
+      }
       break;
     case Token::ASSIGN_BIT_OR:
     case Token::ASSIGN_BIT_XOR:
@@ -368,6 +394,12 @@ void AstOptimizer::VisitCallNew(CallNew* node) {
 
 
 void AstOptimizer::VisitCallRuntime(CallRuntime* node) {
+  ScopedFuncNameInferrer scoped_fni(&func_name_inferrer_);
+  if (Factory::InitializeVarGlobal_symbol()->Equals(*node->name()) &&
+      node->arguments()->length() >= 2 &&
+      node->arguments()->at(1)->AsFunctionLiteral() != NULL) {
+      scoped_fni.Enter();
+  }
   OptimizeArguments(node->arguments());
 }
 
@@ -794,15 +826,12 @@ bool Rewriter::Optimize(FunctionLiteral* function) {
   ZoneList<Statement*>* body = function->body();
 
   if (FLAG_optimize_ast && !body->is_empty()) {
-    Scope* scope = function->scope();
-    if (!scope->is_global_scope()) {
-      AstOptimizer optimizer;
+    AstOptimizer optimizer(function->name());
     optimizer.Optimize(body);
     if (optimizer.HasStackOverflow()) {
       return false;
     }
   }
-  }
   return true;
 }
 

src/runtime.cc

@@ -3391,6 +3391,13 @@ static Object* Runtime_StringToUpperCase(Arguments args) {
 }
 
 
+bool Runtime::IsUpperCaseChar(uint16_t ch) {
+  unibrow::uchar chars[unibrow::ToUppercase::kMaxWidth];
+  int char_length = to_upper_mapping.get(ch, 0, chars);
+  return char_length == 0;
+}
+
+
 static Object* Runtime_NumberToString(Arguments args) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 1);
@@ -6061,7 +6068,7 @@ static Object* Runtime_SetFunctionBreakPoint(Arguments args) {
 }
 
 
-static Object* FindSharedFunctionInfoInScript(Handle<Script> script,
+Object* Runtime::FindSharedFunctionInfoInScript(Handle<Script> script,
                                                 int position) {
   // Iterate the heap looking for SharedFunctionInfo generated from the
   // script. The inner most SharedFunctionInfo containing the source position
@@ -6159,7 +6166,8 @@ static Object* Runtime_SetScriptBreakPoint(Arguments args) {
   RUNTIME_ASSERT(wrapper->value()->IsScript());
   Handle<Script> script(Script::cast(wrapper->value()));
 
-  Object* result = FindSharedFunctionInfoInScript(script, source_position);
+  Object* result = Runtime::FindSharedFunctionInfoInScript(
+      script, source_position);
   if (!result->IsUndefined()) {
     Handle<SharedFunctionInfo> shared(SharedFunctionInfo::cast(result));
     // Find position within function. The script position might be before the

src/runtime.h

@@ -355,6 +355,8 @@ class Runtime : public AllStatic {
 
   static int StringMatch(Handle<String> sub, Handle<String> pat, int index);
 
+  static bool IsUpperCaseChar(uint16_t ch);
+
   // TODO(1240886): The following three methods are *not* handle safe,
   // but accept handle arguments. This seems fragile.
 
@@ -369,6 +371,10 @@ class Runtime : public AllStatic {
 
   static Object* GetObjectProperty(Handle<Object> object, Handle<Object> key);
 
+  // This function is used in FunctionNameUsing* tests.
+  static Object* FindSharedFunctionInfoInScript(Handle<Script> script,
+                                                int position);
+
   // Helper functions used stubs.
   static void PerformGC(Object* result);
 };

test/cctest/SConscript

@@ -42,6 +42,7 @@ SOURCES = {
     'test-debug.cc',
     'test-decls.cc',
     'test-flags.cc',
+    'test-func-name-inference.cc',
     'test-hashmap.cc',
     'test-heap.cc',
     'test-list.cc',

test/cctest/test-func-name-inference.cc

+// Copyright 2007-2009 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 "api.h"
+#include "runtime.h"
+#include "cctest.h"
+
+
+using ::v8::internal::Handle;
+using ::v8::internal::JSFunction;
+using ::v8::internal::Object;
+using ::v8::internal::Script;
+using ::v8::internal::SharedFunctionInfo;
+using ::v8::internal::String;
+
+namespace i = ::v8::internal;
+
+
+static v8::Persistent<v8::Context> env;
+
+
+static void InitializeVM() {
+  if (env.IsEmpty()) {
+    v8::HandleScope scope;
+    env = v8::Context::New();
+  }
+  v8::HandleScope scope;
+  env->Enter();
+}
+
+
+static void CheckFunctionName(v8::Handle<v8::Script> script,
+                              const char* func_pos_src,
+                              const char* ref_inferred_name) {
+  // Get script source.
+  Handle<JSFunction> fun = v8::Utils::OpenHandle(*script);
+  Handle<Script> i_script(Script::cast(fun->shared()->script()));
+  CHECK(i_script->source()->IsString());
+  Handle<String> script_src(String::cast(i_script->source()));
+
+  // Find the position of a given func source substring in the source.
+  Handle<String> func_pos_str =
+      i::Factory::NewStringFromAscii(i::CStrVector(func_pos_src));
+  int func_pos = i::Runtime::StringMatch(script_src, func_pos_str, 0);
+  CHECK_NE(0, func_pos);
+
+  // Obtain SharedFunctionInfo for the function.
+  Object* shared_func_info_ptr =
+      i::Runtime::FindSharedFunctionInfoInScript(i_script, func_pos);
+  CHECK(shared_func_info_ptr != i::Heap::undefined_value());
+  Handle<SharedFunctionInfo> shared_func_info(
+      SharedFunctionInfo::cast(shared_func_info_ptr));
+
+  // Verify inferred function name.
+  i::SmartPointer<char> inferred_name =
+      shared_func_info->inferred_name()->ToCString();
+  CHECK_EQ(ref_inferred_name, *inferred_name);
+}
+
+
+static v8::Handle<v8::Script> Compile(const char* src) {
+  return v8::Script::Compile(v8::String::New(src));
+}
+
+
+TEST(GlobalProperty) {
+  InitializeVM();
+  v8::HandleScope scope;
+
+  v8::Handle<v8::Script> script = Compile(
+      "fun1 = function() { return 1; }\n"
+      "fun2 = function() { return 2; }\n");
+  CheckFunctionName(script, "return 1", "fun1");
+  CheckFunctionName(script, "return 2", "fun2");
+}
+
+
+TEST(GlobalVar) {
+  InitializeVM();
+  v8::HandleScope scope;
+
+  v8::Handle<v8::Script> script = Compile(
+      "var fun1 = function() { return 1; }\n"
+      "var fun2 = function() { return 2; }\n");
+  CheckFunctionName(script, "return 1", "fun1");
+  CheckFunctionName(script, "return 2", "fun2");
+}
+
+
+TEST(LocalVar) {
+  InitializeVM();
+  v8::HandleScope scope;
+
+  v8::Handle<v8::Script> script = Compile(
+      "function outer() {\n"
+      "  var fun1 = function() { return 1; }\n"
+      "  var fun2 = function() { return 2; }\n"
+      "}");
+  CheckFunctionName(script, "return 1", "fun1");
+  CheckFunctionName(script, "return 2", "fun2");
+}
+
+
+TEST(InConstructor) {
+  InitializeVM();
+  v8::HandleScope scope;
+
+  v8::Handle<v8::Script> script = Compile(
+      "function MyClass() {\n"
+      "  this.method1 = function() { return 1; }\n"
+      "  this.method2 = function() { return 2; }\n"
+      "}");
+  CheckFunctionName(script, "return 1", "MyClass.method1");
+  CheckFunctionName(script, "return 2", "MyClass.method2");
+}
+
+
+TEST(Factory) {
+  InitializeVM();
+  v8::HandleScope scope;
+
+  v8::Handle<v8::Script> script = Compile(
+      "function createMyObj() {\n"
+      "  var obj = {};\n"
+      "  obj.method1 = function() { return 1; }\n"
+      "  obj.method2 = function() { return 2; }\n"
+      "  return obj;\n"
+      "}");
+  CheckFunctionName(script, "return 1", "obj.method1");
+  CheckFunctionName(script, "return 2", "obj.method2");
+}
+
+
+TEST(Static) {
+  InitializeVM();
+  v8::HandleScope scope;
+
+  v8::Handle<v8::Script> script = Compile(
+      "function MyClass() {}\n"
+      "MyClass.static1 = function() { return 1; }\n"
+      "MyClass.static2 = function() { return 2; }\n"
+      "MyClass.MyInnerClass = {}\n"
+      "MyClass.MyInnerClass.static3 = function() { return 3; }\n"
+      "MyClass.MyInnerClass.static4 = function() { return 4; }");
+  CheckFunctionName(script, "return 1", "MyClass.static1");
+  CheckFunctionName(script, "return 2", "MyClass.static2");
+  CheckFunctionName(script, "return 3", "MyClass.MyInnerClass.static3");
+  CheckFunctionName(script, "return 4", "MyClass.MyInnerClass.static4");
+}
+
+
+TEST(Prototype) {
+  InitializeVM();
+  v8::HandleScope scope;
+
+  v8::Handle<v8::Script> script = Compile(
+      "function MyClass() {}\n"
+      "MyClass.prototype.method1 = function() { return 1; }\n"
+      "MyClass.prototype.method2 = function() { return 2; }\n"
+      "MyClass.MyInnerClass = function() {}\n"
+      "MyClass.MyInnerClass.prototype.method3 = function() { return 3; }\n"
+      "MyClass.MyInnerClass.prototype.method4 = function() { return 4; }");
+  CheckFunctionName(script, "return 1", "MyClass.method1");
+  CheckFunctionName(script, "return 2", "MyClass.method2");
+  CheckFunctionName(script, "return 3", "MyClass.MyInnerClass.method3");
+  CheckFunctionName(script, "return 4", "MyClass.MyInnerClass.method4");
+}
+
+
+TEST(ObjectLiteral) {
+  InitializeVM();
+  v8::HandleScope scope;
+
+  v8::Handle<v8::Script> script = Compile(
+      "function MyClass() {}\n"
+      "MyClass.prototype = {\n"
+      "  method1: function() { return 1; },\n"
+      "  method2: function() { return 2; } }");
+  CheckFunctionName(script, "return 1", "MyClass.method1");
+  CheckFunctionName(script, "return 2", "MyClass.method2");
+}
+
+
+TEST(AsParameter) {
+  InitializeVM();
+  v8::HandleScope scope;
+
+  v8::Handle<v8::Script> script = Compile(
+      "function f1(a) { return a(); }\n"
+      "function f2(a, b) { return a() + b(); }\n"
+      "var result1 = f1(function() { return 1; })\n"
+      "var result2 = f2(function() { return 2; }, function() { return 3; })");
+  // Can't infer names here.
+  CheckFunctionName(script, "return 1", "");
+  CheckFunctionName(script, "return 2", "");
+  CheckFunctionName(script, "return 3", "");
+}

tools/v8.xcodeproj/project.pbxproj

@@ -203,6 +203,8 @@
 		89F23C9F0E78D604006B2466 /* simulator-arm.cc in Sources */ = {isa = PBXBuildFile; fileRef = 897FF17D0E719B8F00D62E90 /* simulator-arm.cc */; };
 		89F23CA00E78D609006B2466 /* stub-cache-arm.cc in Sources */ = {isa = PBXBuildFile; fileRef = 897FF18A0E719B8F00D62E90 /* stub-cache-arm.cc */; };
 		89FB0E3A0F8E533F00B04B3C /* d8-posix.cc in Sources */ = {isa = PBXBuildFile; fileRef = 89FB0E360F8E531900B04B3C /* d8-posix.cc */; };
+		9F92FAA90F8F28AD0089F02C /* func-name-inferrer.cc in Sources */ = {isa = PBXBuildFile; fileRef = 9F92FAA70F8F28AD0089F02C /* func-name-inferrer.cc */; };
+		9F92FAAA0F8F28AD0089F02C /* func-name-inferrer.cc in Sources */ = {isa = PBXBuildFile; fileRef = 9F92FAA70F8F28AD0089F02C /* func-name-inferrer.cc */; };
 		9FC86ABD0F5FEDAC00F22668 /* oprofile-agent.cc in Sources */ = {isa = PBXBuildFile; fileRef = 9FC86ABB0F5FEDAC00F22668 /* oprofile-agent.cc */; };
 		9FC86ABE0F5FEDAC00F22668 /* oprofile-agent.cc in Sources */ = {isa = PBXBuildFile; fileRef = 9FC86ABB0F5FEDAC00F22668 /* oprofile-agent.cc */; };
 /* End PBXBuildFile section */
@@ -520,6 +522,8 @@
 		89F23C950E78D5B6006B2466 /* v8_shell-arm */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = "v8_shell-arm"; sourceTree = BUILT_PRODUCTS_DIR; };
 		89FB0E360F8E531900B04B3C /* d8-posix.cc */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = "d8-posix.cc"; path = "../src/d8-posix.cc"; sourceTree = "<group>"; };
 		89FB0E370F8E531900B04B3C /* d8-windows.cc */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = "d8-windows.cc"; path = "../src/d8-windows.cc"; sourceTree = "<group>"; };
+		9F92FAA70F8F28AD0089F02C /* func-name-inferrer.cc */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = "func-name-inferrer.cc"; sourceTree = "<group>"; };
+		9F92FAA80F8F28AD0089F02C /* func-name-inferrer.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "func-name-inferrer.h"; sourceTree = "<group>"; };
 		9FC86ABB0F5FEDAC00F22668 /* oprofile-agent.cc */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = "oprofile-agent.cc"; sourceTree = "<group>"; };
 		9FC86ABC0F5FEDAC00F22668 /* oprofile-agent.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "oprofile-agent.h"; sourceTree = "<group>"; };
 /* End PBXFileReference section */
@@ -692,6 +696,8 @@
 				897FF13B0E719B8F00D62E90 /* frames-inl.h */,
 				897FF13C0E719B8F00D62E90 /* frames.cc */,
 				897FF13D0E719B8F00D62E90 /* frames.h */,
+				9F92FAA70F8F28AD0089F02C /* func-name-inferrer.cc */,
+				9F92FAA80F8F28AD0089F02C /* func-name-inferrer.h */,
 				897FF13E0E719B8F00D62E90 /* global-handles.cc */,
 				897FF13F0E719B8F00D62E90 /* global-handles.h */,
 				897FF1400E719B8F00D62E90 /* globals.h */,
@@ -1117,6 +1123,7 @@
 				89A88E050E71A65D0043BA31 /* flags.cc in Sources */,
 				89A88E060E71A6600043BA31 /* frames-ia32.cc in Sources */,
 				89A88E070E71A6610043BA31 /* frames.cc in Sources */,
+				9F92FAA90F8F28AD0089F02C /* func-name-inferrer.cc in Sources */,
 				89A88E080E71A6620043BA31 /* global-handles.cc in Sources */,
 				89A88E090E71A6640043BA31 /* handles.cc in Sources */,
 				89A88E0A0E71A6650043BA31 /* hashmap.cc in Sources */,
@@ -1217,6 +1224,7 @@
 				89F23C580E78D5B2006B2466 /* flags.cc in Sources */,
 				89F23C9C0E78D5F1006B2466 /* frames-arm.cc in Sources */,
 				89F23C5A0E78D5B2006B2466 /* frames.cc in Sources */,
+				9F92FAAA0F8F28AD0089F02C /* func-name-inferrer.cc in Sources */,
 				89F23C5B0E78D5B2006B2466 /* global-handles.cc in Sources */,
 				89F23C5C0E78D5B2006B2466 /* handles.cc in Sources */,
 				89F23C5D0E78D5B2006B2466 /* hashmap.cc in Sources */,

tools/visual_studio/v8_base.vcproj

@@ -416,6 +416,14 @@
 				RelativePath="..\..\src\frames.h"
 				>
 			</File>
+			<File
+				RelativePath="..\..\src\func-name-inferrer.cc"
+				>
+			</File>
+			<File
+				RelativePath="..\..\src\func-name-inferrer.h"
+				>
+			</File>
 			<File
 				RelativePath="..\..\src\global-handles.cc"
 				>

tools/visual_studio/v8_base_arm.vcproj

@@ -412,6 +412,14 @@
 				RelativePath="..\..\src\frames.h"
 				>
 			</File>
+			<File
+				RelativePath="..\..\src\func-name-inferrer.cc"
+				>
+			</File>
+			<File
+				RelativePath="..\..\src\func-name-inferrer.h"
+				>
+			</File>
 			<File
 				RelativePath="..\..\src\global-handles.cc"
 				>

tools/visual_studio/v8_cctest.vcproj

@@ -185,6 +185,10 @@
 			RelativePath="..\..\test\cctest\test-flags.cc"
 			>
 		</File>
+		<File
+			RelativePath="..\..\test\cctest\test-func-name-inference.cc"
+			>
+		</File>
 		<File
 			RelativePath="..\..\test\cctest\test-hashmap.cc"
 			>