diff options
| author | Rick Hudson <rlh@golang.org> | 2014-11-04 13:31:34 -0500 |
|---|---|---|
| committer | Rick Hudson <rlh@golang.org> | 2014-11-04 13:31:34 -0500 |
| commit | 9155768e48e7de0fd0d6297eaa932d4c489e3f38 (patch) | |
| tree | c3fa5804642a64da1e36b1f9a915a8f463a89559 /src/runtime/mgc0.h | |
| parent | f65bb028c5ceb4fb213b103f24a85f17cf67ac39 (diff) | |
| download | go-9155768e48e7de0fd0d6297eaa932d4c489e3f38.tar.gz | |
[dev.garbage] runtime: Add gc mark verification pass.
This adds an independent mark phase to the GC that can be used to
verify the the default concurrent mark phase has found all reachable
objects. It uses the upper 2 bits of the boundary nibble to encode
the mark leaving the lower bits to encode the boundary and the
normal mark bit.
LGTM=rsc
R=rsc
CC=golang-codereviews
https://codereview.appspot.com/167130043
Diffstat (limited to 'src/runtime/mgc0.h')
| -rw-r--r-- | src/runtime/mgc0.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/runtime/mgc0.h b/src/runtime/mgc0.h index 16fbe4665..519d7206e 100644 --- a/src/runtime/mgc0.h +++ b/src/runtime/mgc0.h @@ -45,8 +45,12 @@ enum { // If you change these, also change scanblock. // scanblock does "if(bits == BitsScalar || bits == BitsDead)" as "if(bits <= BitsScalar)". BitsDead = 0, - BitsScalar = 1, - BitsPointer = 2, + BitsScalar = 1, // 01 + BitsPointer = 2, // 10 + BitsCheckMarkXor = 1, // 10 + BitsScalarMarked = BitsScalar ^ BitsCheckMarkXor, // 00 + BitsPointerMarked = BitsPointer ^ BitsCheckMarkXor, // 11 + BitsMultiWord = 3, // BitsMultiWord will be set for the first word of a multi-word item. // When it is set, one of the following will be set for the second word. |