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runtime: remove bad field from itab

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Just use fun[0]==0 to indicate a bad itab.

Change-Id: I28ecb2d2d857090c1ecc40b1d1866ac24a844848
Reviewed-on: https://go-review.googlesource.com/44473
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
This commit is contained in:
Keith Randall 2017-05-31 09:02:40 -07:00
parent 3d1699ea78
commit 98d0634b7a
4 changed files with 7 additions and 11 deletions
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5
src/runtime/runtime2.go
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@ -628,9 +628,8 @@ type itab struct {
_type *_type
_ uintptr
hash uint32 // copy of _type.hash. Used for type switches.
bad bool // type does not implement interface
_ [3]byte
fun [1]uintptr // variable sized
_ [4]byte
fun [1]uintptr // variable sized. fun[0]==0 means _type does not implement inter.
}
// Lock-free stack node.