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GHC 10.0.0.20260917 · lts/ghc-10.0.x · aa25b89 · 2026-10-10

Moduleghc-10.0.0.20260917GHC2024

GHC.CmmToAsm.Reg.Linear.StackMap

The assignment of virtual registers to stack slots

2 types
3 values

Packageghc-10.0.0.20260917
Exports5
LanguageGHC2024
LicenceBSD-3-Clause
SourceStackMap.hs

typetype StackSlot = Int

Identifier for a stack slot.

datadata StackMap

Constructors

StackMap
- stackMapNextFreeSlot :: !Int
  The slots that are still available to be allocated.
- stackMapAssignment :: UniqFM Unique (StackSlot, Int)
  Assignment of vregs to stack slots.
  We record not just the slot, but also how many stack slots the vreg takes up, in order to avoid re-using a stack slot for a register that has grown but already had a stack slot (#26668).

valueemptyStackMap :: StackMap

An empty stack map, with all slots available.

valuegetStackSlotFor :: StackMap -> Format -> Unique -> (StackMap, Int)

If this vreg unique already has a stack assignment then return the slot number, otherwise allocate a new slot, and update the map.

valuegetStackUse :: StackMap -> Int

Return the number of stack slots that were allocated