Revert r12430, r12432, r12433 (basic support for Latin1).

BUG=

Review URL: https://chromiumcodereview.appspot.com/10905075

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12438 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/factory.cc

@@ -204,23 +204,10 @@ Handle<String> Factory::NewStringFromAscii(Vector<const char> string,
 }
 
 Handle<String> Factory::NewStringFromUtf8(Vector<const char> string,
-                                          PretenureFlag pretenure,
-                                          String::AsciiHint ascii_hint) {
+                                          PretenureFlag pretenure) {
   CALL_HEAP_FUNCTION(
       isolate(),
-      isolate()->heap()->AllocateStringFromUtf8(
-          string, pretenure, ascii_hint),
-      String);
-}
-
-
-Handle<String> Factory::NewStringFromLatin1(Vector<const char> string,
-                                            PretenureFlag pretenure,
-                                            String::AsciiHint ascii_hint) {
-  CALL_HEAP_FUNCTION(
-      isolate(),
-      isolate()->heap()->AllocateStringFromLatin1(
-          string, pretenure, ascii_hint),
+      isolate()->heap()->AllocateStringFromUtf8(string, pretenure),
       String);
 }
 

src/factory.h

@@ -120,13 +120,7 @@ class Factory {
   // flags in the parser.
   Handle<String> NewStringFromUtf8(
       Vector<const char> str,
-      PretenureFlag pretenure = NOT_TENURED,
-      String::AsciiHint ascii_hint = String::MAYBE_ASCII);
-
-  Handle<String> NewStringFromLatin1(
-      Vector<const char> str,
-      PretenureFlag pretenure = NOT_TENURED,
-      String::AsciiHint ascii_hint = String::MAYBE_ASCII);
+      PretenureFlag pretenure = NOT_TENURED);
 
   Handle<String> NewStringFromTwoByte(
       Vector<const uc16> str,

src/heap-inl.h

@@ -83,14 +83,9 @@ void PromotionQueue::ActivateGuardIfOnTheSamePage() {
 
 
 MaybeObject* Heap::AllocateStringFromUtf8(Vector<const char> str,
-                                          PretenureFlag pretenure,
-                                          String::AsciiHint ascii_hint) {
-  if ((ascii_hint == String::MAYBE_ASCII &&
-       String::IsAscii(str.start(), str.length())) ||
-      ascii_hint == String::ASCII) {
-    // Assert that the ASCII-hint is correct.
-    ASSERT(ascii_hint != String::ASCII ||
-           String::IsAscii(str.start(), str.length()));
+                                          PretenureFlag pretenure) {
+  // Check for ASCII first since this is the common case.
+  if (String::IsAscii(str.start(), str.length())) {
     // If the string is ASCII, we do not need to convert the characters
     // since UTF8 is backwards compatible with ASCII.
     return AllocateStringFromAscii(str, pretenure);
@@ -100,24 +95,6 @@ MaybeObject* Heap::AllocateStringFromUtf8(Vector<const char> str,
 }
 
 
-MaybeObject* Heap::AllocateStringFromLatin1(Vector<const char> str,
-                                            PretenureFlag pretenure,
-                                            String::AsciiHint ascii_hint) {
-  if ((ascii_hint == String::MAYBE_ASCII &&
-        String::IsAscii(str.start(), str.length())) ||
-       ascii_hint == String::ASCII) {
-     // Assert that the strict ASCII-hint is correct.
-     ASSERT(ascii_hint != String::ASCII ||
-            String::IsAscii(str.start(), str.length()));
-     // If the string is ASCII, we do not need to convert the characters
-     // since Latin1 is backwards compatible with ASCII.
-     return AllocateStringFromAscii(str, pretenure);
-  }
-  // Non-ASCII and we need to decode.
-  return AllocateStringFromLatin1Slow(str, pretenure);
-}
-
-
 MaybeObject* Heap::AllocateSymbol(Vector<const char> str,
                                   int chars,
                                   uint32_t hash_field) {

src/heap.cc

@@ -48,7 +48,6 @@
 #include "snapshot.h"
 #include "store-buffer.h"
 #include "v8threads.h"
-#include "v8utils.h"
 #include "vm-state-inl.h"
 #if V8_TARGET_ARCH_ARM && !V8_INTERPRETED_REGEXP
 #include "regexp-macro-assembler.h"
@@ -4391,8 +4390,7 @@ MaybeObject* Heap::ReinitializeJSGlobalProxy(JSFunction* constructor,
 
 MaybeObject* Heap::AllocateStringFromAscii(Vector<const char> string,
                                            PretenureFlag pretenure) {
-  int length = string.length();
-  if (length == 1) {
+  if (string.length() == 1) {
     return Heap::LookupSingleCharacterStringFromCode(string[0]);
   }
   Object* result;
@@ -4401,10 +4399,11 @@ MaybeObject* Heap::AllocateStringFromAscii(Vector<const char> string,
     if (!maybe_result->ToObject(&result)) return maybe_result;
   }
 
-  isolate_->counters()->string_length_ascii()->Increment(length);
-
   // Copy the characters into the new object.
-  CopyChars(SeqAsciiString::cast(result)->GetChars(), string.start(), length);
+  SeqAsciiString* string_result = SeqAsciiString::cast(result);
+  for (int i = 0; i < string.length(); i++) {
+    string_result->SeqAsciiStringSet(i, string[i]);
+  }
   return result;
 }
 
@@ -4431,63 +4430,41 @@ MaybeObject* Heap::AllocateStringFromUtf8Slow(Vector<const char> string,
     if (!maybe_result->ToObject(&result)) return maybe_result;
   }
 
-  isolate_->counters()->string_length_utf8()->Increment(chars);
-
   // Convert and copy the characters into the new object.
-  SeqTwoByteString* twobyte = SeqTwoByteString::cast(result);
+  String* string_result = String::cast(result);
   decoder->Reset(string.start(), string.length());
   int i = 0;
   while (i < chars) {
     uint32_t r = decoder->GetNext();
     if (r > unibrow::Utf16::kMaxNonSurrogateCharCode) {
-      twobyte->SeqTwoByteStringSet(i++, unibrow::Utf16::LeadSurrogate(r));
-      twobyte->SeqTwoByteStringSet(i++, unibrow::Utf16::TrailSurrogate(r));
+      string_result->Set(i++, unibrow::Utf16::LeadSurrogate(r));
+      string_result->Set(i++, unibrow::Utf16::TrailSurrogate(r));
     } else {
-      twobyte->SeqTwoByteStringSet(i++, r);
+      string_result->Set(i++, r);
     }
   }
   return result;
 }
 
 
-MaybeObject* Heap::AllocateStringFromLatin1Slow(Vector<const char> string,
-                                                PretenureFlag pretenure) {
-  int chars = string.length();
-  Object* result;
-  { MaybeObject* maybe_result = AllocateRawTwoByteString(chars, pretenure);
-    if (!maybe_result->ToObject(&result)) return maybe_result;
-  }
-
-  isolate_->counters()->string_length_latin1()->Increment(chars);
-
-  // Convert and copy the characters into the new object.
-  SeqTwoByteString* string_result = SeqTwoByteString::cast(result);
-  CopyChars(string_result->GetChars(),
-            reinterpret_cast<const unsigned char*>(string.start()),
-            chars);
-  return result;
-}
-
-
 MaybeObject* Heap::AllocateStringFromTwoByte(Vector<const uc16> string,
                                              PretenureFlag pretenure) {
   // Check if the string is an ASCII string.
-  Object* result;
-  int length = string.length();
-  const uc16* start = string.start();
-
-  if (String::IsAscii(start, length)) {
-    MaybeObject* maybe_result = AllocateRawAsciiString(length, pretenure);
-    if (!maybe_result->ToObject(&result)) return maybe_result;
-    isolate_->counters()->string_length_ascii()->Increment(length);
-    CopyChars(SeqAsciiString::cast(result)->GetChars(), start, length);
+  MaybeObject* maybe_result;
+  if (String::IsAscii(string.start(), string.length())) {
+    maybe_result = AllocateRawAsciiString(string.length(), pretenure);
   } else {  // It's not an ASCII string.
-    MaybeObject* maybe_result = AllocateRawTwoByteString(length, pretenure);
-    if (!maybe_result->ToObject(&result)) return maybe_result;
-    isolate_->counters()->string_length_utf16()->Increment(length);
-    CopyChars(SeqTwoByteString::cast(result)->GetChars(), start, length);
+    maybe_result = AllocateRawTwoByteString(string.length(), pretenure);
   }
+  Object* result;
+  if (!maybe_result->ToObject(&result)) return maybe_result;
 
+  // Copy the characters into the new object, which may be either ASCII or
+  // UTF-16.
+  String* string_result = String::cast(result);
+  for (int i = 0; i < string.length(); i++) {
+    string_result->Set(i, string[i]);
+  }
   return result;
 }
 

src/heap.h

@@ -678,17 +678,9 @@ class Heap {
       Vector<const char> str,
       PretenureFlag pretenure = NOT_TENURED);
   MUST_USE_RESULT inline MaybeObject* AllocateStringFromUtf8(
-      Vector<const char> str,
-      PretenureFlag pretenure = NOT_TENURED,
-      String::AsciiHint ascii_hint = String::MAYBE_ASCII);
-  MUST_USE_RESULT MaybeObject* AllocateStringFromUtf8Slow(
       Vector<const char> str,
       PretenureFlag pretenure = NOT_TENURED);
-  MUST_USE_RESULT inline MaybeObject* AllocateStringFromLatin1(
-      Vector<const char> str,
-      PretenureFlag pretenure = NOT_TENURED,
-      String::AsciiHint ascii_hint = String::MAYBE_ASCII);
-  MUST_USE_RESULT MaybeObject* AllocateStringFromLatin1Slow(
+  MUST_USE_RESULT MaybeObject* AllocateStringFromUtf8Slow(
       Vector<const char> str,
       PretenureFlag pretenure = NOT_TENURED);
   MUST_USE_RESULT MaybeObject* AllocateStringFromTwoByte(

src/objects.h

@@ -7128,10 +7128,6 @@ class String: public HeapObject {
     friend class String;
   };
 
-  enum AsciiHint { MAYBE_ASCII = 0,
-                   ASCII       = 1,
-                   NOT_ASCII   = 2 };
-
   // Get and set the length of the string.
   inline int length();
   inline void set_length(int value);

src/v8-counters.h

@@ -252,10 +252,6 @@ namespace internal {
   SC(string_add_make_two_char, V8.StringAddMakeTwoChar)               \
   SC(string_compare_native, V8.StringCompareNative)                   \
   SC(string_compare_runtime, V8.StringCompareRuntime)                 \
-  SC(string_length_utf8, V8.StringLengthUtf8)                         \
-  SC(string_length_ascii, V8.StringLengthAScii)                       \
-  SC(string_length_latin1, V8.StringLengthLatin1)                     \
-  SC(string_length_utf16, V8.StringLengthUtf16)                       \
   SC(regexp_entry_runtime, V8.RegExpEntryRuntime)                     \
   SC(regexp_entry_native, V8.RegExpEntryNative)                       \
   SC(number_to_string_native, V8.NumberToStringNative)                \