e610c25df0
Currently the runtime assumes that the allocation for the stack is exactly [stack.lo, stack.hi). We're about to steal a small part of this allocation for per-stack GC metadata. To prepare for this, this commit adds a field to the G for the allocated size of the stack. With this change, stack.lo and stack.hi continue to act as the true bounds on the stack, but are no longer also used as the bounds on the stack allocation. (I also tried this the other way around, where stack.lo and stack.hi remained the allocation bounds and I introduced a new top of stack. However, there are far more places that assume stack.hi is the true top of the stack than there are places that assume it's the top of the allocation.) Change-Id: Ifa9d956753be53d286d09cbc73d47fb34a18c0c6 Reviewed-on: https://go-review.googlesource.com/10312 Reviewed-by: Russ Cox <rsc@golang.org> |
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