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runtime: add pointer size to type structure

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This adds a field to the runtime type structure that records the size
of the prefix of objects of that type containing pointers. Any data
after this offset is scalar data.

This is necessary for shrinking the type bitmaps to 1 bit and will
help the garbage collector efficiently estimate the amount of heap
that needs to be scanned.

Change-Id: I1318d79e6360dca0ac980245016c562e61f52ff5
Reviewed-on: https://go-review.googlesource.com/9691
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Austin Clements 2015-05-04 14:37:45 -04:00
parent 91938fd1ca
commit 98a9d36837
4 changed files with 74 additions and 8 deletions
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5
src/runtime/type.go
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@ -8,9 +8,12 @@ package runtime
import "unsafe"
// Needs to be in sync with ../../cmd/internal/ld/decodesym.go:/^commonsize and pkg/reflect/type.go:/type.
// Needs to be in sync with ../cmd/internal/ld/decodesym.go:/^func.commonsize,
// ../cmd/internal/gc/reflect.go:/^func.dcommontype and
// ../reflect/type.go:/^type.rtype.
type _type struct {
size uintptr
ptrsize uintptr // Bytes of prefix containing pointer slots.
hash uint32
_unused uint8
align uint8