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fixes #19291; implements wasMoved hook (#21303)

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* fixes #19291; implements `wasMoved` hook

* basics

* checkpoint

* finish `wasMoved`

* add a test for #19291

* add documentation and changelog

* work `attachedWasMoved` with generics

* fixes optimizer

* register `=wasMoved`

* handle wasMoved magcis

* check another round

* some patches

* try `op == nil`

* nicer

* generate `wasMoved` before `destroy`

* try again

* fixes tests

* default wasMoved

* Update tests/destructor/tv2_cast.nim

* Update tests/destructor/tv2_cast.nim

* Update tests/arc/topt_refcursors.nim
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ringabout 2023-03-02 12:29:40 +08:00 • committed by GitHub
commit a137e50150
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12 changed files with 131 additions and 39 deletions
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5
compiler/semstmts.nim
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@ -1779,7 +1779,7 @@ proc whereToBindTypeHook(c: PContext; t: PType): PType =
proc bindTypeHook(c: PContext; s: PSym; n: PNode; op: TTypeAttachedOp) =
let t = s.typ
var noError = false
let cond = if op == attachedDestructor:
let cond = if op in {attachedDestructor, attachedWasMoved}:
t.len == 2 and t[0] == nil and t[1].kind == tyVar
elif op == attachedTrace:
t.len == 3 and t[0] == nil and t[1].kind == tyVar and t[2].kind == tyPointer
@ -1894,6 +1894,9 @@ proc semOverride(c: PContext, s: PSym, n: PNode) =
of "=trace":
if s.magic != mTrace:
bindTypeHook(c, s, n, attachedTrace)
of "=wasmoved":
if s.magic != mWasMoved:
bindTypeHook(c, s, n, attachedWasMoved)
else:
if sfOverriden in s.flags:
localError(c.config, n.info, errGenerated,