diff options
| author | Sven Tennie <sven.tennie@gmail.com> | 2020-10-31 13:28:54 -0400 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2021-09-23 15:59:38 -0400 |
| commit | 6f7f59901c047882ba8c9ae8812264f86b12483a (patch) | |
| tree | dbff896e8fb871d947b20c3b58736b82469be89a /rts/PrimOps.cmm | |
| parent | 022d9717d06542c2345e27ef018390a9d034a1f1 (diff) | |
| download | haskell-6f7f59901c047882ba8c9ae8812264f86b12483a.tar.gz | |
Introduce stack snapshotting / cloning (#18741)
Add `StackSnapshot#` primitive type that represents a cloned stack (StgStack).
The cloning interface consists of two functions, that clone either the treads
own stack (cloneMyStack) or another threads stack (cloneThreadStack).
The stack snapshot is offline/cold, i.e. it isn't evaluated any further. This is
useful for analyses as it prevents concurrent modifications.
For technical details, please see Note [Stack Cloning].
Co-authored-by: Ben Gamari <bgamari.foss@gmail.com>
Co-authored-by: Matthew Pickering <matthewtpickering@gmail.com>
Diffstat (limited to 'rts/PrimOps.cmm')
| -rw-r--r-- | rts/PrimOps.cmm | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/rts/PrimOps.cmm b/rts/PrimOps.cmm index 8f99105b18..122bac4e08 100644 --- a/rts/PrimOps.cmm +++ b/rts/PrimOps.cmm @@ -2927,3 +2927,14 @@ stg_setThreadAllocationCounterzh ( I64 counter ) StgTSO_alloc_limit(CurrentTSO) = counter + TO_I64(offset); return (); } + +stg_cloneMyStackzh () { + W_ stgStack; + W_ clonedStack; + stgStack = StgTSO_stackobj(CurrentTSO); + StgStack_sp(stgStack) = Sp; + + ("ptr" clonedStack) = ccall cloneStack(MyCapability() "ptr", stgStack "ptr"); + + return (clonedStack); +} |