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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
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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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6
lib/system/mmdisp.nim
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@ -102,18 +102,20 @@ else:
include "system/gc"
when not declared(nimNewSeqOfCap) and not defined(nimSeqsV2):
{.push overflowChecks: on.}
proc nimNewSeqOfCap(typ: PNimType, cap: int): pointer {.compilerproc.} =
when defined(gcRegions):
let s = mulInt(cap, typ.base.size) # newStr already adds GenericSeqSize
let s = cap * typ.base.size # newStr already adds GenericSeqSize
result = newStr(typ, s, ntfNoRefs notin typ.base.flags)
else:
let s = addInt(mulInt(cap, typ.base.size), GenericSeqSize)
let s = cap * typ.base.size + GenericSeqSize
when declared(newObjNoInit):
result = if ntfNoRefs in typ.base.flags: newObjNoInit(typ, s) else: newObj(typ, s)
else:
result = newObj(typ, s)
cast[PGenericSeq](result).len = 0
cast[PGenericSeq](result).reserved = cap
{.pop.}
{.pop.}