Upgrade v8 to 2.0.2

28 files changed, 553 insertions, 41 deletions

diff --git a/deps/v8/ChangeLog b/deps/v8/ChangeLog
index 668cd9a92..bf2c244b4 100644
--- a/deps/v8/ChangeLog
+++ b/deps/v8/ChangeLog
@@ -1,3 +1,18 @@
+2009-11-24: Version 2.0.2
+
+        Improved profiler support.
+
+        Fixed bug that broke compilation of d8 with readline support.
+
+
+2009-11-20: Version 2.0.1
+
+        Fixed crash bug in String.prototype.replace.
+
+        Reverted a change which caused Chromium interactive ui test
+        failures.
+
+        
 2009-11-18: Version 2.0.0
 
         Added support for VFP on ARM.
diff --git a/deps/v8/src/allocation.h b/deps/v8/src/allocation.h
index 586c4fd0d..70a3a0388 100644
--- a/deps/v8/src/allocation.h
+++ b/deps/v8/src/allocation.h
@@ -124,7 +124,7 @@ static void DeleteArray(T* array) {
 // and StrNDup uses new and calls the FatalProcessOutOfMemory handler
 // if allocation fails.
 char* StrDup(const char* str);
-char* StrNDup(const char* str, size_t n);
+char* StrNDup(const char* str, int n);
 
 
 // Allocation policy for allocating in the C free store using malloc
diff --git a/deps/v8/src/arm/codegen-arm.cc b/deps/v8/src/arm/codegen-arm.cc
index b08615e61..c62756d5a 100644
--- a/deps/v8/src/arm/codegen-arm.cc
+++ b/deps/v8/src/arm/codegen-arm.cc
@@ -3385,6 +3385,51 @@ void CodeGenerator::GenerateIsArray(ZoneList<Expression*>* args) {
 }
 
 
+void CodeGenerator::GenerateIsObject(ZoneList<Expression*>* args) {
+  // This generates a fast version of:
+  // (typeof(arg) === 'object' || %_ClassOf(arg) == 'RegExp')
+  VirtualFrame::SpilledScope spilled_scope;
+  ASSERT(args->length() == 1);
+  LoadAndSpill(args->at(0));
+  frame_->EmitPop(r1);
+  __ tst(r1, Operand(kSmiTagMask));
+  false_target()->Branch(eq);
+
+  __ LoadRoot(ip, Heap::kNullValueRootIndex);
+  __ cmp(r1, ip);
+  true_target()->Branch(eq);
+
+  Register map_reg = r2;
+  __ ldr(map_reg, FieldMemOperand(r1, HeapObject::kMapOffset));
+  // Undetectable objects behave like undefined when tested with typeof.
+  __ ldrb(r1, FieldMemOperand(map_reg, Map::kBitFieldOffset));
+  __ and_(r1, r1, Operand(1 << Map::kIsUndetectable));
+  __ cmp(r1, Operand(1 << Map::kIsUndetectable));
+  false_target()->Branch(eq);
+
+  __ ldrb(r1, FieldMemOperand(map_reg, Map::kInstanceTypeOffset));
+  __ cmp(r1, Operand(FIRST_JS_OBJECT_TYPE));
+  false_target()->Branch(lt);
+  __ cmp(r1, Operand(LAST_JS_OBJECT_TYPE));
+  cc_reg_ = le;
+}
+
+
+void CodeGenerator::GenerateIsFunction(ZoneList<Expression*>* args) {
+  // This generates a fast version of:
+  // (%_ClassOf(arg) === 'Function')
+  VirtualFrame::SpilledScope spilled_scope;
+  ASSERT(args->length() == 1);
+  LoadAndSpill(args->at(0));
+  frame_->EmitPop(r0);
+  __ tst(r0, Operand(kSmiTagMask));
+  false_target()->Branch(eq);
+  Register map_reg = r2;
+  __ CompareObjectType(r0, map_reg, r1, JS_FUNCTION_TYPE);
+  cc_reg_ = eq;
+}
+
+
 void CodeGenerator::GenerateIsConstructCall(ZoneList<Expression*>* args) {
   VirtualFrame::SpilledScope spilled_scope;
   ASSERT(args->length() == 0);
diff --git a/deps/v8/src/arm/codegen-arm.h b/deps/v8/src/arm/codegen-arm.h
index 8cbf450f3..30a1ae572 100644
--- a/deps/v8/src/arm/codegen-arm.h
+++ b/deps/v8/src/arm/codegen-arm.h
@@ -334,6 +334,8 @@ class CodeGenerator: public AstVisitor {
   void GenerateIsSmi(ZoneList<Expression*>* args);
   void GenerateIsNonNegativeSmi(ZoneList<Expression*>* args);
   void GenerateIsArray(ZoneList<Expression*>* args);
+  void GenerateIsObject(ZoneList<Expression*>* args);
+  void GenerateIsFunction(ZoneList<Expression*>* args);
 
   // Support for construct call checks.
   void GenerateIsConstructCall(ZoneList<Expression*>* args);
diff --git a/deps/v8/src/builtins.cc b/deps/v8/src/builtins.cc
index fa1b34e65..b66635c50 100644
--- a/deps/v8/src/builtins.cc
+++ b/deps/v8/src/builtins.cc
@@ -380,6 +380,9 @@ BUILTIN(HandleApiCall) {
     {
       // Leaving JavaScript.
       VMState state(EXTERNAL);
+#ifdef ENABLE_LOGGING_AND_PROFILING
+      state.set_external_callback(v8::ToCData<Address>(callback_obj));
+#endif
       value = callback(new_args);
     }
     if (value.IsEmpty()) {
@@ -446,6 +449,9 @@ static Object* HandleApiCallAsFunctionOrConstructor(bool is_construct_call,
     {
       // Leaving JavaScript.
       VMState state(EXTERNAL);
+#ifdef ENABLE_LOGGING_AND_PROFILING
+      state.set_external_callback(v8::ToCData<Address>(callback_obj));
+#endif
       value = callback(new_args);
     }
     if (value.IsEmpty()) {
diff --git a/deps/v8/src/codegen.cc b/deps/v8/src/codegen.cc
index 6917d459c..a6d5fb47f 100644
--- a/deps/v8/src/codegen.cc
+++ b/deps/v8/src/codegen.cc
@@ -343,7 +343,9 @@ CodeGenerator::InlineRuntimeLUT CodeGenerator::kInlineRuntimeLUT[] = {
   {&CodeGenerator::GenerateLog, "_Log"},
   {&CodeGenerator::GenerateRandomPositiveSmi, "_RandomPositiveSmi"},
   {&CodeGenerator::GenerateMathSin, "_Math_sin"},
-  {&CodeGenerator::GenerateMathCos, "_Math_cos"}
+  {&CodeGenerator::GenerateMathCos, "_Math_cos"},
+  {&CodeGenerator::GenerateIsObject, "_IsObject"},
+  {&CodeGenerator::GenerateIsFunction, "_IsFunction"},
 };
 
 
diff --git a/deps/v8/src/flag-definitions.h b/deps/v8/src/flag-definitions.h
index 975350353..8c9bb22dc 100644
--- a/deps/v8/src/flag-definitions.h
+++ b/deps/v8/src/flag-definitions.h
@@ -143,7 +143,7 @@ DEFINE_bool(debug_info, true, "add debug information to compiled functions")
 DEFINE_bool(strict, false, "strict error checking")
 DEFINE_int(min_preparse_length, 1024,
            "minimum length for automatic enable preparsing")
-DEFINE_bool(fast_compiler, true,
+DEFINE_bool(fast_compiler, false,
             "use the fast-mode compiler for some top-level code")
 DEFINE_bool(trace_bailout, false,
             "print reasons for failing to use fast compilation")
diff --git a/deps/v8/src/heap.cc b/deps/v8/src/heap.cc
index 43886c144..06dc59cdd 100644
--- a/deps/v8/src/heap.cc
+++ b/deps/v8/src/heap.cc
@@ -1762,6 +1762,41 @@ Object* Heap::AllocateSharedFunctionInfo(Object* name) {
 }
 
 
+// Returns true for a character in a range.  Both limits are inclusive.
+static inline bool Between(uint32_t character, uint32_t from, uint32_t to) {
+  // This makes uses of the the unsigned wraparound.
+  return character - from <= to - from;
+}
+
+
+static inline Object* MakeOrFindTwoCharacterString(uint32_t c1, uint32_t c2) {
+  String* symbol;
+  // Numeric strings have a different hash algorithm not known by
+  // LookupTwoCharsSymbolIfExists, so we skip this step for such strings.
+  if ((!Between(c1, '0', '9') || !Between(c2, '0', '9')) &&
+      Heap::symbol_table()->LookupTwoCharsSymbolIfExists(c1, c2, &symbol)) {
+    return symbol;
+  // Now we know the length is 2, we might as well make use of that fact
+  // when building the new string.
+  } else if ((c1 | c2) <= String::kMaxAsciiCharCodeU) {  // We can do this
+    ASSERT(IsPowerOf2(String::kMaxAsciiCharCodeU + 1));  // because of this.
+    Object* result = Heap::AllocateRawAsciiString(2);
+    if (result->IsFailure()) return result;
+    char* dest = SeqAsciiString::cast(result)->GetChars();
+    dest[0] = c1;
+    dest[1] = c2;
+    return result;
+  } else {
+    Object* result = Heap::AllocateRawTwoByteString(2);
+    if (result->IsFailure()) return result;
+    uc16* dest = SeqTwoByteString::cast(result)->GetChars();
+    dest[0] = c1;
+    dest[1] = c2;
+    return result;
+  }
+}
+
+
 Object* Heap::AllocateConsString(String* first, String* second) {
   int first_length = first->length();
   if (first_length == 0) {
@@ -1774,6 +1809,16 @@ Object* Heap::AllocateConsString(String* first, String* second) {
   }
 
   int length = first_length + second_length;
+
+  // Optimization for 2-byte strings often used as keys in a decompression
+  // dictionary.  Check whether we already have the string in the symbol
+  // table to prevent creation of many unneccesary strings.
+  if (length == 2) {
+    unsigned c1 = first->Get(0);
+    unsigned c2 = second->Get(0);
+    return MakeOrFindTwoCharacterString(c1, c2);
+  }
+
   bool is_ascii = first->IsAsciiRepresentation()
       && second->IsAsciiRepresentation();
 
@@ -1843,6 +1888,13 @@ Object* Heap::AllocateSubString(String* buffer,
   if (length == 1) {
     return Heap::LookupSingleCharacterStringFromCode(
         buffer->Get(start));
+  } else if (length == 2) {
+    // Optimization for 2-byte strings often used as keys in a decompression
+    // dictionary.  Check whether we already have the string in the symbol
+    // table to prevent creation of many unneccesary strings.
+    unsigned c1 = buffer->Get(start);
+    unsigned c2 = buffer->Get(start + 1);
+    return MakeOrFindTwoCharacterString(c1, c2);
   }
 
   // Make an attempt to flatten the buffer to reduce access time.
diff --git a/deps/v8/src/heap.h b/deps/v8/src/heap.h
index 8c1bb1887..90d714c7f 100644
--- a/deps/v8/src/heap.h
+++ b/deps/v8/src/heap.h
@@ -631,6 +631,7 @@ class Heap : public AllStatic {
   }
   static Object* LookupSymbol(String* str);
   static bool LookupSymbolIfExists(String* str, String** symbol);
+  static bool LookupTwoCharsSymbolIfExists(String* str, String** symbol);
 
   // Compute the matching symbol map for a string if possible.
   // NULL is returned if string is in new space or not flattened.
diff --git a/deps/v8/src/ia32/codegen-ia32.cc b/deps/v8/src/ia32/codegen-ia32.cc
index 69a17cd9b..ac2a7a026 100644
--- a/deps/v8/src/ia32/codegen-ia32.cc
+++ b/deps/v8/src/ia32/codegen-ia32.cc
@@ -4870,6 +4870,55 @@ void CodeGenerator::GenerateIsArray(ZoneList<Expression*>* args) {
 }
 
 
+void CodeGenerator::GenerateIsObject(ZoneList<Expression*>* args) {
+  // This generates a fast version of:
+  // (typeof(arg) === 'object' || %_ClassOf(arg) == 'RegExp')
+  ASSERT(args->length() == 1);
+  Load(args->at(0));
+  Result obj = frame_->Pop();
+  obj.ToRegister();
+
+  __ test(obj.reg(), Immediate(kSmiTagMask));
+  destination()->false_target()->Branch(zero);
+  __ cmp(obj.reg(), Factory::null_value());
+  destination()->true_target()->Branch(equal);
+
+  Result map = allocator()->Allocate();
+  ASSERT(map.is_valid());
+  __ mov(map.reg(), FieldOperand(obj.reg(), HeapObject::kMapOffset));
+  // Undetectable objects behave like undefined when tested with typeof.
+  __ movzx_b(map.reg(), FieldOperand(map.reg(), Map::kBitFieldOffset));
+  __ test(map.reg(), Immediate(1 << Map::kIsUndetectable));
+  destination()->false_target()->Branch(not_zero);
+  __ mov(map.reg(), FieldOperand(obj.reg(), HeapObject::kMapOffset));
+  __ movzx_b(map.reg(), FieldOperand(map.reg(), Map::kInstanceTypeOffset));
+  __ cmp(map.reg(), FIRST_JS_OBJECT_TYPE);
+  destination()->false_target()->Branch(less);
+  __ cmp(map.reg(), LAST_JS_OBJECT_TYPE);
+  obj.Unuse();
+  map.Unuse();
+  destination()->Split(less_equal);
+}
+
+
+void CodeGenerator::GenerateIsFunction(ZoneList<Expression*>* args) {
+  // This generates a fast version of:
+  // (%_ClassOf(arg) === 'Function')
+  ASSERT(args->length() == 1);
+  Load(args->at(0));
+  Result obj = frame_->Pop();
+  obj.ToRegister();
+  __ test(obj.reg(), Immediate(kSmiTagMask));
+  destination()->false_target()->Branch(zero);
+  Result temp = allocator()->Allocate();
+  ASSERT(temp.is_valid());
+  __ CmpObjectType(obj.reg(), JS_FUNCTION_TYPE, temp.reg());
+  obj.Unuse();
+  temp.Unuse();
+  destination()->Split(equal);
+}
+
+
 void CodeGenerator::GenerateIsConstructCall(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 0);
 
diff --git a/deps/v8/src/ia32/codegen-ia32.h b/deps/v8/src/ia32/codegen-ia32.h
index 0e69a63d8..ebab3caa1 100644
--- a/deps/v8/src/ia32/codegen-ia32.h
+++ b/deps/v8/src/ia32/codegen-ia32.h
@@ -512,6 +512,8 @@ class CodeGenerator: public AstVisitor {
   void GenerateIsSmi(ZoneList<Expression*>* args);
   void GenerateIsNonNegativeSmi(ZoneList<Expression*>* args);
   void GenerateIsArray(ZoneList<Expression*>* args);
+  void GenerateIsObject(ZoneList<Expression*>* args);
+  void GenerateIsFunction(ZoneList<Expression*>* args);
 
   // Support for construct call checks.
   void GenerateIsConstructCall(ZoneList<Expression*>* args);
diff --git a/deps/v8/src/log-inl.h b/deps/v8/src/log-inl.h
index 1844d2bf7..1500252a5 100644
--- a/deps/v8/src/log-inl.h
+++ b/deps/v8/src/log-inl.h
@@ -55,7 +55,7 @@ inline const char* StateToString(StateTag state) {
   }
 }
 
-VMState::VMState(StateTag state) : disabled_(true) {
+VMState::VMState(StateTag state) : disabled_(true), external_callback_(NULL) {
   if (!Logger::is_logging()) {
     return;
   }
diff --git a/deps/v8/src/log.cc b/deps/v8/src/log.cc
index 9acb7f785..aec813d97 100644
--- a/deps/v8/src/log.cc
+++ b/deps/v8/src/log.cc
@@ -30,6 +30,7 @@
 #include "v8.h"
 
 #include "bootstrapper.h"
+#include "global-handles.h"
 #include "log.h"
 #include "macro-assembler.h"
 #include "serialize.h"
@@ -154,12 +155,18 @@ void StackTracer::Trace(TickSample* sample) {
     return;
   }
 
+  int i = 0;
+  const Address callback = Logger::current_state_ != NULL ?
+      Logger::current_state_->external_callback() : NULL;
+  if (callback != NULL) {
+    sample->stack[i++] = callback;
+  }
+
   SafeStackTraceFrameIterator it(
       reinterpret_cast<Address>(sample->fp),
       reinterpret_cast<Address>(sample->sp),
       reinterpret_cast<Address>(sample->sp),
       js_entry_sp);
-  int i = 0;
   while (!it.done() && i < TickSample::kMaxFramesCount) {
     sample->stack[i++] = it.frame()->pc();
     it.Advance();
@@ -673,6 +680,26 @@ class CompressionHelper {
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 
+void Logger::CallbackEvent(String* name, Address entry_point) {
+#ifdef ENABLE_LOGGING_AND_PROFILING
+  if (!Log::IsEnabled() || !FLAG_log_code) return;
+  LogMessageBuilder msg;
+  msg.Append("%s,%s,",
+             log_events_[CODE_CREATION_EVENT], log_events_[CALLBACK_TAG]);
+  msg.AppendAddress(entry_point);
+  SmartPointer<char> str =
+      name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL);
+  msg.Append(",1,\"%s\"", *str);
+  if (FLAG_compress_log) {
+    ASSERT(compression_helper_ != NULL);
+    if (!compression_helper_->HandleMessage(&msg)) return;
+  }
+  msg.Append('\n');
+  msg.WriteToLogFile();
+#endif
+}
+
+
 void Logger::CodeCreateEvent(LogEventsAndTags tag,
                              Code* code,
                              const char* comment) {
@@ -1191,11 +1218,25 @@ void Logger::LogCompiledFunctions() {
           LOG(CodeCreateEvent(Logger::SCRIPT_TAG,
                               shared->code(), *script_name));
         }
-        continue;
+      } else {
+        LOG(CodeCreateEvent(
+            Logger::LAZY_COMPILE_TAG, shared->code(), *func_name));
       }
+    } else if (shared->function_data()->IsFunctionTemplateInfo()) {
+      // API function.
+      FunctionTemplateInfo* fun_data =
+          FunctionTemplateInfo::cast(shared->function_data());
+      Object* raw_call_data = fun_data->call_code();
+      if (!raw_call_data->IsUndefined()) {
+        CallHandlerInfo* call_data = CallHandlerInfo::cast(raw_call_data);
+        Object* callback_obj = call_data->callback();
+        Address entry_point = v8::ToCData<Address>(callback_obj);
+        LOG(CallbackEvent(*func_name, entry_point));
+      }
+    } else {
+      LOG(CodeCreateEvent(
+          Logger::LAZY_COMPILE_TAG, shared->code(), *func_name));
     }
-    // If no script or script has no name.
-    LOG(CodeCreateEvent(Logger::LAZY_COMPILE_TAG, shared->code(), *func_name));
   }
 
   DeleteArray(sfis);
diff --git a/deps/v8/src/log.h b/deps/v8/src/log.h
index e7931ca42..f099f02b6 100644
--- a/deps/v8/src/log.h
+++ b/deps/v8/src/log.h
@@ -91,15 +91,20 @@ class CompressionHelper;
 class VMState BASE_EMBEDDED {
 #ifdef ENABLE_LOGGING_AND_PROFILING
  public:
-  inline explicit VMState(StateTag state);
+  inline VMState(StateTag state);
   inline ~VMState();
 
   StateTag state() { return state_; }
+  Address external_callback() { return external_callback_; }
+  void set_external_callback(Address external_callback) {
+    external_callback_ = external_callback;
+  }
 
  private:
   bool disabled_;
   StateTag state_;
   VMState* previous_;
+  Address external_callback_;
 #else
  public:
   explicit VMState(StateTag state) {}
@@ -122,6 +127,7 @@ class VMState BASE_EMBEDDED {
   V(CALL_MISS_TAG,                  "CallMiss",               "cm")       \
   V(CALL_NORMAL_TAG,                "CallNormal",             "cn")       \
   V(CALL_PRE_MONOMORPHIC_TAG,       "CallPreMonomorphic",     "cpm")      \
+  V(CALLBACK_TAG,                   "Callback",               "cb")       \
   V(EVAL_TAG,                       "Eval",                   "e")        \
   V(FUNCTION_TAG,                   "Function",               "f")        \
   V(KEYED_LOAD_IC_TAG,              "KeyedLoadIC",            "klic")     \
@@ -200,6 +206,8 @@ class Logger {
 
 
   // ==== Events logged by --log-code. ====
+  // Emits a code event for a callback function.
+  static void CallbackEvent(String* name, Address entry_point);
   // Emits a code create event.
   static void CodeCreateEvent(LogEventsAndTags tag,
                               Code* code, const char* source);
@@ -330,6 +338,7 @@ class Logger {
   friend class TimeLog;
   friend class Profiler;
   friend class SlidingStateWindow;
+  friend class StackTracer;
   friend class VMState;
 
   friend class LoggerTestHelper;
diff --git a/deps/v8/src/macros.py b/deps/v8/src/macros.py
index d6a2426c5..5b06099a8 100644
--- a/deps/v8/src/macros.py
+++ b/deps/v8/src/macros.py
@@ -79,11 +79,10 @@ macro IS_NULL_OR_UNDEFINED(arg) = (arg == null);
 macro IS_UNDEFINED(arg)         = (typeof(arg) === 'undefined');
 macro IS_NUMBER(arg)            = (typeof(arg) === 'number');
 macro IS_STRING(arg)            = (typeof(arg) === 'string');
-macro IS_OBJECT(arg)            = (typeof(arg) === 'object' || %_ClassOf(arg) == 'RegExp');
 macro IS_BOOLEAN(arg)           = (typeof(arg) === 'boolean');
+macro IS_OBJECT(arg)            = (%_IsObject(arg));
 macro IS_ARRAY(arg)             = (%_IsArray(arg));
-# IS_FUNCTION uses %_ClassOf rather than typeof so as to exclude regexps.
-macro IS_FUNCTION(arg)          = (%_ClassOf(arg) === 'Function');
+macro IS_FUNCTION(arg)          = (%_IsFunction(arg));
 macro IS_REGEXP(arg)            = (%_ClassOf(arg) === 'RegExp');
 macro IS_DATE(arg)              = (%_ClassOf(arg) === 'Date');
 macro IS_NUMBER_WRAPPER(arg)    = (%_ClassOf(arg) === 'Number');
diff --git a/deps/v8/src/objects-inl.h b/deps/v8/src/objects-inl.h
index 507a3ab6b..7a6444de5 100644
--- a/deps/v8/src/objects-inl.h
+++ b/deps/v8/src/objects-inl.h
@@ -3103,8 +3103,19 @@ void Map::ClearCodeCache() {
 
 void JSArray::EnsureSize(int required_size) {
   ASSERT(HasFastElements());
-  if (elements()->length() >= required_size) return;
-  Expand(required_size);
+  Array* elts = elements();
+  const int kArraySizeThatFitsComfortablyInNewSpace = 128;
+  if (elts->length() < required_size) {
+    // Doubling in size would be overkill, but leave some slack to avoid
+    // constantly growing.
+    Expand(required_size + (required_size >> 3));
+    // It's a performance benefit to keep a frequently used array in new-space.
+  } else if (!Heap::new_space()->Contains(elts) &&
+             required_size < kArraySizeThatFitsComfortablyInNewSpace) {
+    // Expand will allocate a new backing store in new space even if the size
+    // we asked for isn't larger than what we had before.
+    Expand(required_size);
+  }
 }
 
 
diff --git a/deps/v8/src/objects.cc b/deps/v8/src/objects.cc
index 5ccacb786..f37658551 100644
--- a/deps/v8/src/objects.cc
+++ b/deps/v8/src/objects.cc
@@ -1463,8 +1463,8 @@ Object* JSObject::SetPropertyPostInterceptor(String* name,
 
 
 Object* JSObject::ReplaceSlowProperty(String* name,
-                                       Object* value,
-                                       PropertyAttributes attributes) {
+                                      Object* value,
+                                      PropertyAttributes attributes) {
   StringDictionary* dictionary = property_dictionary();
   int old_index = dictionary->FindEntry(name);
   int new_enumeration_index = 0;  // 0 means "Use the next available index."
@@ -1478,6 +1478,7 @@ Object* JSObject::ReplaceSlowProperty(String* name,
   return SetNormalizedProperty(name, value, new_details);
 }
 
+
 Object* JSObject::ConvertDescriptorToFieldAndMapTransition(
     String* name,
     Object* new_value,
@@ -1869,6 +1870,14 @@ Object* JSObject::SetProperty(LookupResult* result,
   // interceptor calls.
   AssertNoContextChange ncc;
 
+  // Optimization for 2-byte strings often used as keys in a decompression
+  // dictionary.  We make these short keys into symbols to avoid constantly
+  // reallocating them.
+  if (!name->IsSymbol() && name->length() <= 2) {
+    Object* symbol_version = Heap::LookupSymbol(name);
+    if (!symbol_version->IsFailure()) name = String::cast(symbol_version);
+  }
+
   // Check access rights if needed.
   if (IsAccessCheckNeeded()
       && !Top::MayNamedAccess(this, name, v8::ACCESS_SET)) {
@@ -5240,9 +5249,7 @@ void JSArray::Expand(int required_size) {
   Handle<JSArray> self(this);
   Handle<FixedArray> old_backing(FixedArray::cast(elements()));
   int old_size = old_backing->length();
-  // Doubling in size would be overkill, but leave some slack to avoid
-  // constantly growing.
-  int new_size = required_size + (required_size >> 3);
+  int new_size = required_size > old_size ? required_size : old_size;
   Handle<FixedArray> new_backing = Factory::NewFixedArray(new_size);
   // Can't use this any more now because we may have had a GC!
   for (int i = 0; i < old_size; i++) new_backing->set(i, old_backing->get(i));
@@ -7327,6 +7334,67 @@ Object* SymbolTable::LookupString(String* string, Object** s) {
 }
 
 
+// This class is used for looking up two character strings in the symbol table.
+// If we don't have a hit we don't want to waste much time so we unroll the
+// string hash calculation loop here for speed.  Doesn't work if the two
+// characters form a decimal integer, since such strings have a different hash
+// algorithm.
+class TwoCharHashTableKey : public HashTableKey {
+ public:
+  TwoCharHashTableKey(uint32_t c1, uint32_t c2)
+    : c1_(c1), c2_(c2) {
+    // Char 1.
+    uint32_t hash = c1 + (c1 << 10);
+    hash ^= hash >> 6;
+    // Char 2.
+    hash += c2;
+    hash += hash << 10;
+    hash ^= hash >> 6;
+    // GetHash.
+    hash += hash << 3;
+    hash ^= hash >> 11;
+    hash += hash << 15;
+    if (hash == 0) hash = 27;
+#ifdef DEBUG
+    StringHasher hasher(2);
+    hasher.AddCharacter(c1);
+    hasher.AddCharacter(c2);
+    // If this assert fails then we failed to reproduce the two-character
+    // version of the string hashing algorithm above.  One reason could be
+    // that we were passed two digits as characters, since the hash
+    // algorithm is different in that case.
+    ASSERT_EQ(static_cast<int>(hasher.GetHash()), static_cast<int>(hash));
+#endif
+    hash_ = hash;
+  }
+
+  bool IsMatch(Object* o) {
+    if (!o->IsString()) return false;
+    String* other = String::cast(o);
+    if (other->length() != 2) return false;
+    if (other->Get(0) != c1_) return false;
+    return other->Get(1) == c2_;
+  }
+
+  uint32_t Hash() { return hash_; }
+  uint32_t HashForObject(Object* key) {
+    if (!key->IsString()) return 0;
+    return String::cast(key)->Hash();
+  }
+
+  Object* AsObject() {
+    // The TwoCharHashTableKey is only used for looking in the symbol
+    // table, not for adding to it.
+    UNREACHABLE();
+    return NULL;
+  }
+ private:
+  uint32_t c1_;
+  uint32_t c2_;
+  uint32_t hash_;
+};
+
+
 bool SymbolTable::LookupSymbolIfExists(String* string, String** symbol) {
   SymbolKey key(string);
   int entry = FindEntry(&key);
@@ -7341,6 +7409,22 @@ bool SymbolTable::LookupSymbolIfExists(String* string, String** symbol) {
 }
 
 
+bool SymbolTable::LookupTwoCharsSymbolIfExists(uint32_t c1,
+                                               uint32_t c2,
+                                               String** symbol) {
+  TwoCharHashTableKey key(c1, c2);
+  int entry = FindEntry(&key);
+  if (entry == kNotFound) {
+    return false;
+  } else {
+    String* result = String::cast(KeyAt(entry));
+    ASSERT(StringShape(result).IsSymbol());
+    *symbol = result;
+    return true;
+  }
+}
+
+
 Object* SymbolTable::LookupSymbol(Vector<const char> str, Object** s) {
   Utf8SymbolKey key(str);
   return LookupKey(&key, s);
diff --git a/deps/v8/src/objects.h b/deps/v8/src/objects.h
index 6ea0a820c..d22e7231f 100644
--- a/deps/v8/src/objects.h
+++ b/deps/v8/src/objects.h
@@ -2188,6 +2188,7 @@ class SymbolTable: public HashTable<SymbolTableShape, HashTableKey*> {
   // true if it is found, assigning the symbol to the given output
   // parameter.
   bool LookupSymbolIfExists(String* str, String** symbol);
+  bool LookupTwoCharsSymbolIfExists(uint32_t c1, uint32_t c2, String** symbol);
 
   // Casting.
   static inline SymbolTable* cast(Object* obj);
@@ -3846,6 +3847,7 @@ class StringHasher {
   bool is_array_index_;
   bool is_first_char_;
   bool is_valid_;
+  friend class TwoCharHashTableKey;
 };
 
 
diff --git a/deps/v8/src/runtime.cc b/deps/v8/src/runtime.cc
index ccb88851b..6ae22330a 100644
--- a/deps/v8/src/runtime.cc
+++ b/deps/v8/src/runtime.cc
@@ -1750,10 +1750,10 @@ static Object* StringReplaceRegExpWithString(String* subject,
   // Index of end of last match.
   int prev = 0;
 
-  // Number of parts added by compiled replacement plus preceeding string
-  // and possibly suffix after last match. It is possible for compiled
-  // replacements to use two elements when encoded as two smis.
-  const int parts_added_per_loop = compiled_replacement.parts() * 2 + 2;
+  // Number of parts added by compiled replacement plus preceeding
+  // string and possibly suffix after last match.  It is possible for
+  // all components to use two elements when encoded as two smis.
+  const int parts_added_per_loop = 2 * (compiled_replacement.parts() + 2);
   bool matched = true;
   do {
     ASSERT(last_match_info_handle->HasFastElements());
@@ -2356,12 +2356,20 @@ static Object* Runtime_SubString(Arguments args) {
   ASSERT(args.length() == 3);
 
   CONVERT_CHECKED(String, value, args[0]);
-  CONVERT_DOUBLE_CHECKED(from_number, args[1]);
-  CONVERT_DOUBLE_CHECKED(to_number, args[2]);
-
-  int start = FastD2I(from_number);
-  int end = FastD2I(to_number);
-
+  Object* from = args[1];
+  Object* to = args[2];
+  int start, end;
+  // We have a fast integer-only case here to avoid a conversion to double in
+  // the common case where from and to are Smis.
+  if (from->IsSmi() && to->IsSmi()) {
+    start = Smi::cast(from)->value();
+    end = Smi::cast(to)->value();
+  } else {
+    CONVERT_DOUBLE_CHECKED(from_number, from);
+    CONVERT_DOUBLE_CHECKED(to_number, to);
+    start = FastD2I(from_number);
+    end = FastD2I(to_number);
+  }
   RUNTIME_ASSERT(end >= start);
   RUNTIME_ASSERT(start >= 0);
   RUNTIME_ASSERT(end <= value->length());
diff --git a/deps/v8/src/serialize.cc b/deps/v8/src/serialize.cc
index de87022e0..00cd69ec0 100644
--- a/deps/v8/src/serialize.cc
+++ b/deps/v8/src/serialize.cc
@@ -668,7 +668,7 @@ void Deserializer::ReadChunk(Object** current,
         break;
       case OBJECT_SERIALIZATION + CODE_SPACE:
         ReadObject(CODE_SPACE, Heap::code_space(), current++);
-        Logger::LogCodeObject(current[-1]);
+        LOG(LogCodeObject(current[-1]));
         break;
       case OBJECT_SERIALIZATION + CELL_SPACE:
         ReadObject(CELL_SPACE, Heap::cell_space(), current++);
@@ -678,7 +678,7 @@ void Deserializer::ReadChunk(Object** current,
         break;
       case OBJECT_SERIALIZATION + kLargeCode:
         ReadObject(kLargeCode, Heap::lo_space(), current++);
-        Logger::LogCodeObject(current[-1]);
+        LOG(LogCodeObject(current[-1]));
         break;
       case OBJECT_SERIALIZATION + kLargeFixedArray:
         ReadObject(kLargeFixedArray, Heap::lo_space(), current++);
@@ -687,7 +687,7 @@ void Deserializer::ReadChunk(Object** current,
         Object* new_code_object = NULL;
         ReadObject(kLargeCode, Heap::lo_space(), &new_code_object);
         Code* code_object = reinterpret_cast<Code*>(new_code_object);
-        Logger::LogCodeObject(code_object);
+        LOG(LogCodeObject(code_object));
         // Setting a branch/call to another code object from code.
         Address location_of_branch_data = reinterpret_cast<Address>(current);
         Assembler::set_target_at(location_of_branch_data,
@@ -700,7 +700,7 @@ void Deserializer::ReadChunk(Object** current,
         Object* new_code_object = NULL;
         ReadObject(CODE_SPACE, Heap::code_space(), &new_code_object);
         Code* code_object = reinterpret_cast<Code*>(new_code_object);
-        Logger::LogCodeObject(code_object);
+        LOG(LogCodeObject(code_object));
         // Setting a branch/call to another code object from code.
         Address location_of_branch_data = reinterpret_cast<Address>(current);
         Assembler::set_target_at(location_of_branch_data,
diff --git a/deps/v8/src/v8.cc b/deps/v8/src/v8.cc
index d17274253..3bec827aa 100644
--- a/deps/v8/src/v8.cc
+++ b/deps/v8/src/v8.cc
@@ -116,7 +116,7 @@ bool V8::Initialize(Deserializer *des) {
 
   if (FLAG_log_code) {
     HandleScope scope;
-    Logger::LogCompiledFunctions();
+    LOG(LogCompiledFunctions());
   }
 
   return true;
diff --git a/deps/v8/src/version.cc b/deps/v8/src/version.cc
index b448032a6..f9dc9b75f 100644
--- a/deps/v8/src/version.cc
+++ b/deps/v8/src/version.cc
@@ -34,7 +34,7 @@
 // cannot be changed without changing the SCons build script.
 #define MAJOR_VERSION     2
 #define MINOR_VERSION     0
-#define BUILD_NUMBER      0
+#define BUILD_NUMBER      2
 #define PATCH_LEVEL       0
 #define CANDIDATE_VERSION false
 
diff --git a/deps/v8/src/x64/codegen-x64.cc b/deps/v8/src/x64/codegen-x64.cc
index e2296d9bd..b32357266 100644
--- a/deps/v8/src/x64/codegen-x64.cc
+++ b/deps/v8/src/x64/codegen-x64.cc
@@ -3616,6 +3616,48 @@ void CodeGenerator::GenerateIsArray(ZoneList<Expression*>* args) {
 }
 
 
+void CodeGenerator::GenerateIsObject(ZoneList<Expression*>* args) {
+  // This generates a fast version of:
+  // (typeof(arg) === 'object' || %_ClassOf(arg) == 'RegExp')
+  ASSERT(args->length() == 1);
+  Load(args->at(0));
+  Result obj = frame_->Pop();
+  obj.ToRegister();
+  Condition is_smi = masm_->CheckSmi(obj.reg());
+  destination()->false_target()->Branch(is_smi);
+
+  __ Move(kScratchRegister, Factory::null_value());
+  __ cmpq(obj.reg(), kScratchRegister);
+  destination()->true_target()->Branch(equal);
+
+  __ movq(kScratchRegister, FieldOperand(obj.reg(), HeapObject::kMapOffset));
+  // Undetectable objects behave like undefined when tested with typeof.
+  __ testb(FieldOperand(kScratchRegister, Map::kBitFieldOffset),
+          Immediate(1 << Map::kIsUndetectable));
+  destination()->false_target()->Branch(not_zero);
+  __ CmpInstanceType(kScratchRegister, FIRST_JS_OBJECT_TYPE);
+  destination()->false_target()->Branch(less);
+  __ CmpInstanceType(kScratchRegister, LAST_JS_OBJECT_TYPE);
+  obj.Unuse();
+  destination()->Split(less_equal);
+}
+
+
+void CodeGenerator::GenerateIsFunction(ZoneList<Expression*>* args) {
+  // This generates a fast version of:
+  // (%_ClassOf(arg) === 'Function')
+  ASSERT(args->length() == 1);
+  Load(args->at(0));
+  Result obj = frame_->Pop();
+  obj.ToRegister();
+  Condition is_smi = masm_->CheckSmi(obj.reg());
+  destination()->false_target()->Branch(is_smi);
+  __ CmpObjectType(obj.reg(), JS_FUNCTION_TYPE, kScratchRegister);
+  obj.Unuse();
+  destination()->Split(equal);
+}
+
+
 void CodeGenerator::GenerateIsConstructCall(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 0);
 
diff --git a/deps/v8/src/x64/codegen-x64.h b/deps/v8/src/x64/codegen-x64.h
index 0301daf3d..20df41a50 100644
--- a/deps/v8/src/x64/codegen-x64.h
+++ b/deps/v8/src/x64/codegen-x64.h
@@ -510,6 +510,8 @@ class CodeGenerator: public AstVisitor {
   void GenerateIsSmi(ZoneList<Expression*>* args);
   void GenerateIsNonNegativeSmi(ZoneList<Expression*>* args);
   void GenerateIsArray(ZoneList<Expression*>* args);
+  void GenerateIsObject(ZoneList<Expression*>* args);
+  void GenerateIsFunction(ZoneList<Expression*>* args);
 
   // Support for construct call checks.
   void GenerateIsConstructCall(ZoneList<Expression*>* args);
diff --git a/deps/v8/test/cctest/test-log.cc b/deps/v8/test/cctest/test-log.cc
index 57004d7c8..de29fe097 100644
--- a/deps/v8/test/cctest/test-log.cc
+++ b/deps/v8/test/cctest/test-log.cc
@@ -247,7 +247,7 @@ TEST(ProfLazyMode) {
   i::FLAG_logfile = "*";
 
   // If tests are being run manually, V8 will be already initialized
-  // by the test below.
+  // by the bottom test.
   const bool need_to_set_up_logger = i::V8::IsRunning();
   v8::HandleScope scope;
   v8::Handle<v8::Context> env = v8::Context::New();
@@ -474,6 +474,70 @@ TEST(Issue23768) {
 }
 
 
+static v8::Handle<v8::Value> ObjMethod1(const v8::Arguments& args) {
+  return v8::Handle<v8::Value>();
+}
+
+TEST(LogCallbacks) {
+  const bool saved_prof_lazy = i::FLAG_prof_lazy;
+  const bool saved_prof = i::FLAG_prof;
+  const bool saved_prof_auto = i::FLAG_prof_auto;
+  i::FLAG_prof = true;
+  i::FLAG_prof_lazy = false;
+  i::FLAG_prof_auto = false;
+  i::FLAG_logfile = "*";
+
+  // If tests are being run manually, V8 will be already initialized
+  // by the bottom test.
+  const bool need_to_set_up_logger = i::V8::IsRunning();
+  v8::HandleScope scope;
+  v8::Handle<v8::Context> env = v8::Context::New();
+  if (need_to_set_up_logger) Logger::Setup();
+  env->Enter();
+
+  // Skip all initially logged stuff.
+  EmbeddedVector<char, 102400> buffer;
+  int log_pos = GetLogLines(0, &buffer);
+
+  v8::Persistent<v8::FunctionTemplate> obj =
+      v8::Persistent<v8::FunctionTemplate>::New(v8::FunctionTemplate::New());
+  obj->SetClassName(v8::String::New("Obj"));
+  v8::Handle<v8::ObjectTemplate> proto = obj->PrototypeTemplate();
+  v8::Local<v8::Signature> signature = v8::Signature::New(obj);
+  proto->Set(v8::String::New("method1"),
+             v8::FunctionTemplate::New(ObjMethod1,
+                                       v8::Handle<v8::Value>(),
+                                       signature),
+             static_cast<v8::PropertyAttribute>(v8::DontDelete));
+
+  env->Global()->Set(v8_str("Obj"), obj->GetFunction());
+  CompileAndRunScript("Obj.prototype.method1.toString();");
+
+  i::Logger::LogCompiledFunctions();
+  log_pos = GetLogLines(log_pos, &buffer);
+  CHECK_GT(log_pos, 0);
+  buffer[log_pos] = 0;
+
+  const char* callback_rec = "code-creation,Callback,";
+  char* pos = strstr(buffer.start(), callback_rec);
+  CHECK_NE(NULL, pos);
+  pos += strlen(callback_rec);
+  EmbeddedVector<char, 100> ref_data;
+  i::OS::SNPrintF(ref_data,
+                  "0x%" V8PRIxPTR ",1,\"method1\"", ObjMethod1);
+  *(pos + strlen(ref_data.start())) = '\0';
+  CHECK_EQ(ref_data.start(), pos);
+
+  obj.Dispose();
+
+  env->Exit();
+  Logger::TearDown();
+  i::FLAG_prof_lazy = saved_prof_lazy;
+  i::FLAG_prof = saved_prof;
+  i::FLAG_prof_auto = saved_prof_auto;
+}
+
+
 static inline bool IsStringEqualTo(const char* r, const char* s) {
   return strncmp(r, s, strlen(r)) == 0;
 }
diff --git a/deps/v8/test/cctest/test-thread-termination.cc b/deps/v8/test/cctest/test-thread-termination.cc
index 552f49df1..1e8102ec7 100644
--- a/deps/v8/test/cctest/test-thread-termination.cc
+++ b/deps/v8/test/cctest/test-thread-termination.cc
@@ -82,14 +82,30 @@ v8::Handle<v8::Value> DoLoop(const v8::Arguments& args) {
 }
 
 
+v8::Handle<v8::Value> DoLoopNoCall(const v8::Arguments& args) {
+  v8::TryCatch try_catch;
+  v8::Script::Compile(v8::String::New("var term = true;"
+                                      "while(true) {"
+                                      "  if (term) terminate();"
+                                      "  term = false;"
+                                      "}"))->Run();
+  CHECK(try_catch.HasCaught());
+  CHECK(try_catch.Exception()->IsNull());
+  CHECK(try_catch.Message().IsEmpty());
+  CHECK(!try_catch.CanContinue());
+  return v8::Undefined();
+}
+
+
 v8::Handle<v8::ObjectTemplate> CreateGlobalTemplate(
-    v8::InvocationCallback terminate) {
+    v8::InvocationCallback terminate,
+    v8::InvocationCallback doloop) {
   v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New();
   global->Set(v8::String::New("terminate"),
               v8::FunctionTemplate::New(terminate));
   global->Set(v8::String::New("fail"), v8::FunctionTemplate::New(Fail));
   global->Set(v8::String::New("loop"), v8::FunctionTemplate::New(Loop));
-  global->Set(v8::String::New("doloop"), v8::FunctionTemplate::New(DoLoop));
+  global->Set(v8::String::New("doloop"), v8::FunctionTemplate::New(doloop));
   return global;
 }
 
@@ -99,7 +115,25 @@ v8::Handle<v8::ObjectTemplate> CreateGlobalTemplate(
 TEST(TerminateOnlyV8ThreadFromThreadItself) {
   v8::HandleScope scope;
   v8::Handle<v8::ObjectTemplate> global =
-      CreateGlobalTemplate(TerminateCurrentThread);
+      CreateGlobalTemplate(TerminateCurrentThread, DoLoop);
+  v8::Persistent<v8::Context> context = v8::Context::New(NULL, global);
+  v8::Context::Scope context_scope(context);
+  // Run a loop that will be infinite if thread termination does not work.
+  v8::Handle<v8::String> source =
+      v8::String::New("try { loop(); fail(); } catch(e) { fail(); }");
+  v8::Script::Compile(source)->Run();
+  // Test that we can run the code again after thread termination.
+  v8::Script::Compile(source)->Run();
+  context.Dispose();
+}
+
+
+// Test that a single thread of JavaScript execution can terminate
+// itself in a loop that performs no calls.
+TEST(TerminateOnlyV8ThreadFromThreadItselfNoLoop) {
+  v8::HandleScope scope;
+  v8::Handle<v8::ObjectTemplate> global =
+      CreateGlobalTemplate(TerminateCurrentThread, DoLoopNoCall);
   v8::Persistent<v8::Context> context = v8::Context::New(NULL, global);
   v8::Context::Scope context_scope(context);
   // Run a loop that will be infinite if thread termination does not work.
@@ -128,7 +162,7 @@ TEST(TerminateOnlyV8ThreadFromOtherThread) {
   thread.Start();
 
   v8::HandleScope scope;
-  v8::Handle<v8::ObjectTemplate> global = CreateGlobalTemplate(Signal);
+  v8::Handle<v8::ObjectTemplate> global = CreateGlobalTemplate(Signal, DoLoop);
   v8::Persistent<v8::Context> context = v8::Context::New(NULL, global);
   v8::Context::Scope context_scope(context);
   // Run a loop that will be infinite if thread termination does not work.
@@ -149,7 +183,8 @@ class LoopingThread : public v8::internal::Thread {
     v8::Locker locker;
     v8::HandleScope scope;
     v8_thread_id_ = v8::V8::GetCurrentThreadId();
-    v8::Handle<v8::ObjectTemplate> global = CreateGlobalTemplate(Signal);
+    v8::Handle<v8::ObjectTemplate> global =
+        CreateGlobalTemplate(Signal, DoLoop);
     v8::Persistent<v8::Context> context = v8::Context::New(NULL, global);
     v8::Context::Scope context_scope(context);
     // Run a loop that will be infinite if thread termination does not work.
diff --git a/deps/v8/test/mjsunit/regress/regress-515.js b/deps/v8/test/mjsunit/regress/regress-515.js
new file mode 100644
index 000000000..7675fe19e
--- /dev/null
+++ b/deps/v8/test/mjsunit/regress/regress-515.js
@@ -0,0 +1,40 @@
+// 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.
+
+// Regression test for http://code.google.com/p/v8/issues/detail?id=515.
+//
+// The test passes if it does not crash.
+
+var length = 2048;
+var s = "";
+for (var i = 0; i < 2048; i++) {
+  s += '.';
+}
+
+var string = s + 'x' + s + 'x' + s;
+
+string.replace(/x/g, "")
diff --git a/deps/v8/tools/gyp/v8.gyp b/deps/v8/tools/gyp/v8.gyp
index 75464f206..d7ee73f6e 100644
--- a/deps/v8/tools/gyp/v8.gyp
+++ b/deps/v8/tools/gyp/v8.gyp
@@ -81,6 +81,7 @@
           ['OS=="linux"', {
             'cflags!': [
               '-O2',
+              '-Os',
             ],
             'cflags': [
               '-fomit-frame-pointer',