Add kHeaderSize constant to SeqString.

This prevents potential misuse of SeqString::kHeaderSize as in the
case of live byte counting in incremental marking stub. All stubs
picked up the undefined size constant SeqString::kHeaderSize, thus
the computed size of all strings was off by two pointers slots.

R=lrn@chromium.org
BUG=v8:1672
TEST=mjsunit/object-seal.js,...

Review URL: http://codereview.chromium.org/7971009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9349 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/code-stubs-arm.cc

@@ -4575,8 +4575,7 @@ void RegExpExecStub::Generate(MacroAssembler* masm) {
 
   // For arguments 4 and 3 get string length, calculate start of string data and
   // calculate the shift of the index (0 for ASCII and 1 for two byte).
-  STATIC_ASSERT(SeqAsciiString::kHeaderSize == SeqTwoByteString::kHeaderSize);
-  __ add(r8, subject, Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
+  __ add(r8, subject, Operand(SeqString::kHeaderSize - kHeapObjectTag));
   __ eor(r3, r3, Operand(1));
   // Load the length from the original subject string from the previous stack
   // frame. Therefore we have to use fp, which points exactly to two pointer

src/mips/code-stubs-mips.cc

@@ -4721,8 +4721,7 @@ void RegExpExecStub::Generate(MacroAssembler* masm) {
 
   // For arguments 4 and 3 get string length, calculate start of string data
   // and calculate the shift of the index (0 for ASCII and 1 for two byte).
-  STATIC_ASSERT(SeqAsciiString::kHeaderSize == SeqTwoByteString::kHeaderSize);
-  __ Addu(t2, subject, Operand(SeqAsciiString::kHeaderSize - kHeapObjectTag));
+  __ Addu(t2, subject, Operand(SeqString::kHeaderSize - kHeapObjectTag));
   __ Xor(a3, a3, Operand(1));  // 1 for 2-byte str, 0 for 1-byte.
   // Load the length from the original subject string from the previous stack
   // frame. Therefore we have to use fp, which points exactly to two pointer

src/objects.h

@@ -6130,6 +6130,9 @@ class SeqString: public String {
   // Casting.
   static inline SeqString* cast(Object* obj);
 
+  // Layout description.
+  static const int kHeaderSize = String::kSize;
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(SeqString);
 };
@@ -6163,10 +6166,6 @@ class SeqAsciiString: public SeqString {
     return OBJECT_POINTER_ALIGN(kHeaderSize + length * kCharSize);
   }
 
-  // Layout description.
-  static const int kHeaderSize = String::kSize;
-  static const int kAlignedSize = POINTER_SIZE_ALIGN(kHeaderSize);
-
   // Maximal memory usage for a single sequential ASCII string.
   static const int kMaxSize = 512 * MB - 1;
   // Maximal length of a single sequential ASCII string.
@@ -6217,10 +6216,6 @@ class SeqTwoByteString: public SeqString {
     return OBJECT_POINTER_ALIGN(kHeaderSize + length * kShortSize);
   }
 
-  // Layout description.
-  static const int kHeaderSize = String::kSize;
-  static const int kAlignedSize = POINTER_SIZE_ALIGN(kHeaderSize);
-
   // Maximal memory usage for a single sequential two-byte string.
   static const int kMaxSize = 512 * MB - 1;
   // Maximal length of a single sequential two-byte string.

src/runtime.cc

@@ -5492,7 +5492,7 @@ static MaybeObject* SlowQuoteJsonString(Isolate* isolate,
   StringType* new_string = StringType::cast(new_object);
 
   Char* write_cursor = reinterpret_cast<Char*>(
-      new_string->address() + SeqAsciiString::kHeaderSize);
+      new_string->address() + SeqString::kHeaderSize);
   if (comma) *(write_cursor++) = ',';
   *(write_cursor++) = '"';
 
@@ -5580,16 +5580,15 @@ static MaybeObject* QuoteJsonString(Isolate* isolate,
   StringType* new_string = StringType::cast(new_object);
   ASSERT(isolate->heap()->new_space()->Contains(new_string));
 
-  STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqAsciiString::kHeaderSize);
   Char* write_cursor = reinterpret_cast<Char*>(
-      new_string->address() + SeqAsciiString::kHeaderSize);
+      new_string->address() + SeqString::kHeaderSize);
   if (comma) *(write_cursor++) = ',';
   write_cursor = WriteQuoteJsonString<Char, Char>(isolate,
                                                   write_cursor,
                                                   characters);
   int final_length = static_cast<int>(
       write_cursor - reinterpret_cast<Char*>(
-          new_string->address() + SeqAsciiString::kHeaderSize));
+          new_string->address() + SeqString::kHeaderSize));
   isolate->heap()->new_space()->
       template ShrinkStringAtAllocationBoundary<StringType>(
           new_string, final_length);
@@ -5667,9 +5666,8 @@ static MaybeObject* QuoteJsonStringArray(Isolate* isolate,
   StringType* new_string = StringType::cast(new_object);
   ASSERT(isolate->heap()->new_space()->Contains(new_string));
 
-  STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqAsciiString::kHeaderSize);
   Char* write_cursor = reinterpret_cast<Char*>(
-      new_string->address() + SeqAsciiString::kHeaderSize);
+      new_string->address() + SeqString::kHeaderSize);
   *(write_cursor++) = '[';
   for (int i = 0; i < length; i++) {
     if (i != 0) *(write_cursor++) = ',';
@@ -5690,7 +5688,7 @@ static MaybeObject* QuoteJsonStringArray(Isolate* isolate,
 
   int final_length = static_cast<int>(
       write_cursor - reinterpret_cast<Char*>(
-          new_string->address() + SeqAsciiString::kHeaderSize));
+          new_string->address() + SeqString::kHeaderSize));
   isolate->heap()->new_space()->
       template ShrinkStringAtAllocationBoundary<StringType>(
           new_string, final_length);

src/spaces.cc

@@ -438,6 +438,7 @@ MemoryChunk* MemoryChunk::Initialize(Heap* heap,
   chunk->SetFlag(WAS_SWEPT_PRECISELY);
 
   ASSERT(OFFSET_OF(MemoryChunk, flags_) == kFlagsOffset);
+  ASSERT(OFFSET_OF(MemoryChunk, live_byte_count_) == kLiveBytesOffset);
 
   if (executable == EXECUTABLE) chunk->SetFlag(IS_EXECUTABLE);
 
@@ -823,7 +824,6 @@ void PagedSpace::Verify(ObjectVisitor* visitor) {
       ASSERT(object->address() + size <= top);
       end_of_previous_object = object->address() + size;
     }
-
     CHECK_LE(black_size, page->LiveBytes());
   }
   ASSERT(allocation_pointer_found_in_space);

test/mjsunit/mjsunit.status

@@ -63,11 +63,6 @@ regress/regress-524: (PASS || TIMEOUT), SKIP if $mode == debug
 debug-liveedit-check-stack: SKIP
 debug-liveedit-patch-positions-replace: SKIP
 
-# Known failures after merge from the bleeding edge (issue 1672)
-debug-scopes: PASS, SKIP if ($mode == debug)
-mirror-object: PASS, SKIP if ($mode == debug)
-harmony/debug-blockscopes: PASS, SKIP if ($mode == debug)
-
 ##############################################################################
 [ $arch == arm ]