[heap] Black is encoded with 11, grey with 10.

src/arm64/macro-assembler-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 4158 matching lines @@
   GetMarkBits(object, bitmap_scratch, shift_scratch);
   Ldr(bitmap_scratch, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize));
   // Shift the bitmap down to get the color of the object in bits [1:0].
   Lsr(bitmap_scratch, bitmap_scratch, shift_scratch);
 
   AssertHasValidColor(bitmap_scratch);
 
   // These bit sequences are backwards. The first character in the string
   // represents the least significant bit.
   DCHECK(strcmp(Marking::kWhiteBitPattern, "00") == 0);
-  DCHECK(strcmp(Marking::kBlackBitPattern, "10") == 0);
-  DCHECK(strcmp(Marking::kGreyBitPattern, "11") == 0);
+  DCHECK(strcmp(Marking::kBlackBitPattern, "11") == 0);
+  DCHECK(strcmp(Marking::kGreyBitPattern, "10") == 0);
 
   // Check for the color.
   if (first_bit == 0) {
     // Checking for white.
     DCHECK(second_bit == 0);
     // We only need to test the first bit.
     Tbz(bitmap_scratch, 0, has_color);
   } else {
     Label other_color;
     // Checking for grey or black.
     Tbz(bitmap_scratch, 0, &other_color);
     if (second_bit == 0) {
       Tbz(bitmap_scratch, 1, has_color);
     } else {
       Tbnz(bitmap_scratch, 1, has_color);
     }
     Bind(&other_color);
   }
 
   // Fall through if it does not have the right color.
 }
 
 
 void MacroAssembler::JumpIfBlack(Register object,
                                  Register scratch0,
                                  Register scratch1,
                                  Label* on_black) {
-  DCHECK(strcmp(Marking::kBlackBitPattern, "10") == 0);
-  HasColor(object, scratch0, scratch1, on_black, 1, 0);  // kBlackBitPattern.
+  DCHECK(strcmp(Marking::kBlackBitPattern, "11") == 0);
+  HasColor(object, scratch0, scratch1, on_black, 1, 1);  // kBlackBitPattern.
 }
 
 
 void MacroAssembler::JumpIfDictionaryInPrototypeChain(
     Register object,
     Register scratch0,
     Register scratch1,
     Label* found) {
   DCHECK(!AreAliased(object, scratch0, scratch1));
   Register current = scratch0;
@@ skipping 25 matching lines @@
 void MacroAssembler::JumpIfWhite(Register value, Register bitmap_scratch,
                                  Register shift_scratch, Register load_scratch,
                                  Register length_scratch,
                                  Label* value_is_white) {
   DCHECK(!AreAliased(
       value, bitmap_scratch, shift_scratch, load_scratch, length_scratch));
 
   // These bit sequences are backwards. The first character in the string
   // represents the least significant bit.
   DCHECK(strcmp(Marking::kWhiteBitPattern, "00") == 0);
-  DCHECK(strcmp(Marking::kBlackBitPattern, "10") == 0);
-  DCHECK(strcmp(Marking::kGreyBitPattern, "11") == 0);
+  DCHECK(strcmp(Marking::kBlackBitPattern, "11") == 0);
+  DCHECK(strcmp(Marking::kGreyBitPattern, "10") == 0);
 
   GetMarkBits(value, bitmap_scratch, shift_scratch);
   Ldr(load_scratch, MemOperand(bitmap_scratch, MemoryChunk::kHeaderSize));
   Lsr(load_scratch, load_scratch, shift_scratch);
 
   AssertHasValidColor(load_scratch);
 
   // If the value is black or grey we don't need to do anything.
   // Since both black and grey have a 1 in the first position and white does
   // not have a 1 there we only need to check one bit.
@@ skipping 598 matching lines @@
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64