[dev.garbage] all: merge dev.cc into dev.garbage

[gostls13.git] / src / runtime / mgc1.go

diff --git a/src/runtime/mgc1.go b/src/runtime/mgc1.go
index d1aab4554614462a1aa2a4643569e6be2b291c9b..04a5207e5478cdd39a74e5e1b63c6175744e96bc 100644 (file)
--- a/src/runtime/mgc1.go
+++ b/src/runtime/mgc1.go
@@ -50,12 +50,15 @@ const (
 
        // If you change these, also change scanblock.
        // scanblock does "if(bits == BitsScalar || bits == BitsDead)" as "if(bits <= BitsScalar)".
-       _BitsDead    = 0
-       _BitsScalar  = 1
-       _BitsPointer = 2
+       _BitsDead          = 0
+       _BitsScalar        = 1                                // 01
+       _BitsPointer       = 2                                // 10
+       _BitsCheckMarkXor  = 1                                // 10
+       _BitsScalarMarked  = _BitsScalar ^ _BitsCheckMarkXor  // 00
+       _BitsPointerMarked = _BitsPointer ^ _BitsCheckMarkXor // 11
 
        // 64 bytes cover objects of size 1024/512 on 64/32 bits, respectively.
-       _MaxGCMask = 64
+       _MaxGCMask = 65536 // TODO(rsc): change back to 64
 )
 
 // Bits in per-word bitmap.