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catchable defects (#13626)

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* allow defects to be caught even for --exceptions:goto (WIP)
* implemented the new --panics:on|off switch; refs https://github.com/nim-lang/RFCs/issues/180
* new implementation for integer overflow checking
* produce a warning if a user-defined exception type inherits from Exception directly
* applied Timothee's suggestions; improved the documentation and replace the term 'checked runtime check' by 'panic'
* fixes #13627
* don't inherit from Exception directly
This commit is contained in:
Andreas Rumpf 2020-03-12 23:44:33 +01:00 • committed by GitHub
commit a6682de004
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35 changed files with 441 additions and 142 deletions
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lib/system/gc_common.nim
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@ -79,7 +79,7 @@ template decTypeSize(cell, t) =
if t.kind in {tyString, tySequence}:
let cap = cast[PGenericSeq](cellToUsr(cell)).space
let size = if t.kind == tyString: cap+1+GenericSeqSize
else: addInt(mulInt(cap, t.base.size), GenericSeqSize)
else: cap * t.base.size + GenericSeqSize
atomicDec t.sizes, size+sizeof(Cell)
else:
atomicDec t.sizes, t.base.size+sizeof(Cell)