- Pushed source code for functions into old space.

- Renamed TryFlattenIfNotFlat to TryFlatten.

Review URL: http://codereview.chromium.org/661181

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3976 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/api.cc

@@ -2615,7 +2615,7 @@ int String::WriteAscii(char* buffer, int start, int length) const {
   StringTracker::RecordWrite(str);
   // Flatten the string for efficiency.  This applies whether we are
   // using StringInputBuffer or Get(i) to access the characters.
-  str->TryFlattenIfNotFlat();
+  str->TryFlatten();
   int end = length;
   if ( (length == -1) || (length > str->length() - start) )
     end = str->length() - start;

src/handles.cc

@@ -203,7 +203,7 @@ void TransformToFastProperties(Handle<JSObject> object,
 
 
 void FlattenString(Handle<String> string) {
-  CALL_HEAP_FUNCTION_VOID(string->TryFlattenIfNotFlat());
+  CALL_HEAP_FUNCTION_VOID(string->TryFlatten());
   ASSERT(string->IsFlat());
 }
 
@@ -362,8 +362,11 @@ Handle<Object> LookupSingleCharacterStringFromCode(uint32_t index) {
 }
 
 
-Handle<String> SubString(Handle<String> str, int start, int end) {
-  CALL_HEAP_FUNCTION(str->SubString(start, end), String);
+Handle<String> SubString(Handle<String> str,
+                         int start,
+                         int end,
+                         PretenureFlag pretenure) {
+  CALL_HEAP_FUNCTION(str->SubString(start, end, pretenure), String);
 }
 
 

src/handles.h

@@ -287,7 +287,10 @@ Handle<FixedArray> GetEnumPropertyKeys(Handle<JSObject> object,
 Handle<FixedArray> UnionOfKeys(Handle<FixedArray> first,
                                Handle<FixedArray> second);
 
-Handle<String> SubString(Handle<String> str, int start, int end);
+Handle<String> SubString(Handle<String> str,
+                         int start,
+                         int end,
+                         PretenureFlag pretenure = NOT_TENURED);
 
 
 // Sets the expected number of properties for the function's instances.

src/heap.cc

@@ -2012,7 +2012,8 @@ Object* Heap::AllocateConsString(String* first, String* second) {
 
 Object* Heap::AllocateSubString(String* buffer,
                                 int start,
-                                int end) {
+                                int end,
+                                PretenureFlag pretenure) {
   int length = end - start;
 
   if (length == 1) {
@@ -2028,16 +2029,13 @@ Object* Heap::AllocateSubString(String* buffer,
   }
 
   // Make an attempt to flatten the buffer to reduce access time.
-  if (!buffer->IsFlat()) {
   buffer->TryFlatten();
-  }
 
   Object* result = buffer->IsAsciiRepresentation()
-      ? AllocateRawAsciiString(length)
-      : AllocateRawTwoByteString(length);
+      ? AllocateRawAsciiString(length, pretenure )
+      : AllocateRawTwoByteString(length, pretenure);
   if (result->IsFailure()) return result;
   String* string_result = String::cast(result);
-
   // Copy the characters into the new object.
   if (buffer->IsAsciiRepresentation()) {
     ASSERT(string_result->IsAsciiRepresentation());

src/heap.h

@@ -556,7 +556,8 @@ class Heap : public AllStatic {
   // Please note this does not perform a garbage collection.
   static Object* AllocateSubString(String* buffer,
                                    int start,
-                                   int end);
+                                   int end,
+                                   PretenureFlag pretenure = NOT_TENURED);
 
   // Allocate a new external string object, which is backed by a string
   // resource that resides outside the V8 heap.

src/objects-inl.h

@@ -1640,13 +1640,11 @@ bool String::Equals(String* other) {
 }
 
 
-Object* String::TryFlattenIfNotFlat() {
+Object* String::TryFlatten(PretenureFlag pretenure) {
   // We don't need to flatten strings that are already flat.  Since this code
   // is inlined, it can be helpful in the flat case to not call out to Flatten.
-  if (!IsFlat()) {
-    return TryFlatten();
-  }
-  return this;
+  if (IsFlat()) return this;
+  return SlowTryFlatten(pretenure);
 }
 
 

src/objects.cc

@@ -673,7 +673,7 @@ static bool AnWord(String* str) {
 }
 
 
-Object* String::TryFlatten() {
+Object* String::SlowTryFlatten(PretenureFlag pretenure) {
 #ifdef DEBUG
   // Do not attempt to flatten in debug mode when allocation is not
   // allowed.  This is to avoid an assertion failure when allocating.
@@ -691,7 +691,7 @@ Object* String::TryFlatten() {
       // There's little point in putting the flat string in new space if the
       // cons string is in old space.  It can never get GCed until there is
       // an old space GC.
-      PretenureFlag tenure = Heap::InNewSpace(this) ? NOT_TENURED : TENURED;
+      PretenureFlag tenure = Heap::InNewSpace(this) ? pretenure : TENURED;
       int len = length();
       Object* object;
       String* result;
@@ -2768,7 +2768,7 @@ Object* JSObject::DefineGetterSetter(String* name,
   }
 
   // Try to flatten before operating on the string.
-  name->TryFlattenIfNotFlat();
+  name->TryFlatten();
 
   // Check if there is an API defined callback object which prohibits
   // callback overwriting in this object or it's prototype chain.
@@ -3546,7 +3546,7 @@ int String::Utf8Length() {
   // doesn't make Utf8Length faster, but it is very likely that
   // the string will be accessed later (for example by WriteUtf8)
   // so it's still a good idea.
-  TryFlattenIfNotFlat();
+  TryFlatten();
   Access<StringInputBuffer> buffer(&string_input_buffer);
   buffer->Reset(0, this);
   int result = 0;
@@ -4637,9 +4637,9 @@ uint32_t String::ComputeHashField(unibrow::CharacterStream* buffer,
 }
 
 
-Object* String::SubString(int start, int end) {
+Object* String::SubString(int start, int end, PretenureFlag pretenure) {
   if (start == 0 && end == length()) return this;
-  Object* result = Heap::AllocateSubString(this, start, end);
+  Object* result = Heap::AllocateSubString(this, start, end, pretenure);
   return result;
 }
 

src/objects.h

@@ -3837,13 +3837,13 @@ class String: public HeapObject {
   // Try to flatten the top level ConsString that is hiding behind this
   // string.  This is a no-op unless the string is a ConsString.  Flatten
   // mutates the ConsString and might return a failure.
-  Object* TryFlatten();
+  Object* SlowTryFlatten(PretenureFlag pretenure);
 
   // Try to flatten the string.  Checks first inline to see if it is necessary.
-  // Do not handle allocation failures.  After calling TryFlattenIfNotFlat, the
+  // Do not handle allocation failures.  After calling TryFlatten, the
   // string could still be a ConsString, in which case a failure is returned.
   // Use FlattenString from Handles.cc to be sure to flatten.
-  inline Object* TryFlattenIfNotFlat();
+  inline Object* TryFlatten(PretenureFlag pretenure = NOT_TENURED);
 
   Vector<const char> ToAsciiVector();
   Vector<const uc16> ToUC16Vector();
@@ -3853,7 +3853,7 @@ class String: public HeapObject {
   bool MarkAsUndetectable();
 
   // Return a substring.
-  Object* SubString(int from, int to);
+  Object* SubString(int from, int to, PretenureFlag pretenure = NOT_TENURED);
 
   // String equality operations.
   inline bool Equals(String* other);

src/parser.cc

@@ -1234,7 +1234,7 @@ FunctionLiteral* Parser::ParseProgram(Handle<String> source,
   Counters::total_parse_size.Increment(source->length());
 
   // Initialize parser state.
-  source->TryFlattenIfNotFlat();
+  source->TryFlatten();
   scanner_.Init(source, stream, 0, JAVASCRIPT);
   ASSERT(target_stack_ == NULL);
 
@@ -1289,7 +1289,7 @@ FunctionLiteral* Parser::ParseLazy(Handle<String> source,
                                    bool is_expression) {
   CompilationZoneScope zone_scope(DONT_DELETE_ON_EXIT);
   HistogramTimerScope timer(&Counters::parse_lazy);
-  source->TryFlattenIfNotFlat();
+  source->TryFlatten();
   Counters::total_parse_size.Increment(source->length());
   SafeStringInputBuffer buffer(source.location());
 
@@ -1338,7 +1338,7 @@ FunctionLiteral* Parser::ParseJson(Handle<String> source,
   Counters::total_parse_size.Increment(source->length());
 
   // Initialize parser state.
-  source->TryFlattenIfNotFlat();
+  source->TryFlatten(TENURED);
   scanner_.Init(source, stream, 0, JSON);
   ASSERT(target_stack_ == NULL);
 
@@ -5088,11 +5088,10 @@ FunctionLiteral* MakeLazyAST(Handle<Script> script,
   always_allow_natives_syntax = allow_natives_syntax_before;
   // Parse the function by pulling the function source from the script source.
   Handle<String> script_source(String::cast(script->source()));
+  Handle<String> function_source =
+      SubString(script_source, start_position, end_position, TENURED);
   FunctionLiteral* result =
-      parser.ParseLazy(SubString(script_source, start_position, end_position),
-                       name,
-                       start_position,
-                       is_expression);
+      parser.ParseLazy(function_source, name, start_position, is_expression);
   return result;
 }
 

src/runtime.cc

@@ -2608,8 +2608,8 @@ static Object* Runtime_StringLocaleCompare(Arguments args) {
   int d = str1->Get(0) - str2->Get(0);
   if (d != 0) return Smi::FromInt(d);
 
-  str1->TryFlattenIfNotFlat();
-  str2->TryFlattenIfNotFlat();
+  str1->TryFlatten();
+  str2->TryFlatten();
 
   static StringInputBuffer buf1;
   static StringInputBuffer buf2;
@@ -2818,7 +2818,7 @@ static Object* Runtime_NumberToPrecision(Arguments args) {
 // string->Get(index).
 static Handle<Object> GetCharAt(Handle<String> string, uint32_t index) {
   if (index < static_cast<uint32_t>(string->length())) {
-    string->TryFlattenIfNotFlat();
+    string->TryFlatten();
     return LookupSingleCharacterStringFromCode(
         string->Get(index));
   }
@@ -3072,7 +3072,7 @@ Object* Runtime::SetObjectProperty(Handle<Object> object,
       result = SetElement(js_object, index, value);
     } else {
       Handle<String> key_string = Handle<String>::cast(key);
-      key_string->TryFlattenIfNotFlat();
+      key_string->TryFlatten();
       result = SetProperty(js_object, key_string, value, attr);
     }
     if (result.is_null()) return Failure::Exception();
@@ -3121,7 +3121,7 @@ Object* Runtime::ForceSetObjectProperty(Handle<JSObject> js_object,
       return js_object->SetElement(index, *value);
     } else {
       Handle<String> key_string = Handle<String>::cast(key);
-      key_string->TryFlattenIfNotFlat();
+      key_string->TryFlatten();
       return js_object->IgnoreAttributesAndSetLocalProperty(*key_string,
                                                             *value,
                                                             attr);
@@ -3173,7 +3173,7 @@ Object* Runtime::ForceDeleteObjectProperty(Handle<JSObject> js_object,
     key_string = Handle<String>::cast(converted);
   }
 
-  key_string->TryFlattenIfNotFlat();
+  key_string->TryFlatten();
   return js_object->DeleteProperty(*key_string, JSObject::FORCE_DELETION);
 }
 
@@ -3669,7 +3669,7 @@ static Object* Runtime_StringToNumber(Arguments args) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 1);
   CONVERT_CHECKED(String, subject, args[0]);
-  subject->TryFlattenIfNotFlat();
+  subject->TryFlatten();
   return Heap::NumberFromDouble(StringToDouble(subject, ALLOW_HEX));
 }
 
@@ -3751,7 +3751,7 @@ static Object* Runtime_URIEscape(Arguments args) {
   ASSERT(args.length() == 1);
   CONVERT_CHECKED(String, source, args[0]);
 
-  source->TryFlattenIfNotFlat();
+  source->TryFlatten();
 
   int escaped_length = 0;
   int length = source->length();
@@ -3864,7 +3864,7 @@ static Object* Runtime_URIUnescape(Arguments args) {
   ASSERT(args.length() == 1);
   CONVERT_CHECKED(String, source, args[0]);
 
-  source->TryFlattenIfNotFlat();
+  source->TryFlatten();
 
   bool ascii = true;
   int length = source->length();
@@ -3904,7 +3904,7 @@ static Object* Runtime_StringParseInt(Arguments args) {
   CONVERT_CHECKED(String, s, args[0]);
   CONVERT_SMI_CHECKED(radix, args[1]);
 
-  s->TryFlattenIfNotFlat();
+  s->TryFlatten();
 
   int len = s->length();
   int i;
@@ -4074,7 +4074,7 @@ static Object* ConvertCase(Arguments args,
   NoHandleAllocation ha;
 
   CONVERT_CHECKED(String, s, args[0]);
-  s->TryFlattenIfNotFlat();
+  s->TryFlatten();
 
   int input_string_length = s->length();
   // Assume that the string is not empty; we need this assumption later
@@ -4111,7 +4111,7 @@ static Object* Runtime_StringTrim(Arguments args) {
   CONVERT_BOOLEAN_CHECKED(trimLeft, args[1]);
   CONVERT_BOOLEAN_CHECKED(trimRight, args[2]);
 
-  s->TryFlattenIfNotFlat();
+  s->TryFlatten();
   int length = s->length();
 
   int left = 0;
@@ -4679,8 +4679,8 @@ static Object* Runtime_StringCompare(Arguments args) {
   if (d < 0) return Smi::FromInt(LESS);
   else if (d > 0) return Smi::FromInt(GREATER);
 
-  x->TryFlattenIfNotFlat();
-  y->TryFlattenIfNotFlat();
+  x->TryFlatten();
+  y->TryFlatten();
 
   return (x->IsFlat() && y->IsFlat()) ? FlatStringCompare(x, y)
                                       : StringInputBufferCompare(x, y);