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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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8
lib/system/gc.nim
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@ -441,13 +441,15 @@ proc newObj(typ: PNimType, size: int): pointer {.compilerRtl.} =
zeroMem(result, size)
when defined(memProfiler): nimProfile(size)
{.push overflowChecks: on.}
proc newSeq(typ: PNimType, len: int): pointer {.compilerRtl.} =
# `newObj` already uses locks, so no need for them here.
let size = addInt(mulInt(len, typ.base.size), GenericSeqSize)
let size = len * typ.base.size + GenericSeqSize
result = newObj(typ, size)
cast[PGenericSeq](result).len = len
cast[PGenericSeq](result).reserved = len
when defined(memProfiler): nimProfile(size)
{.pop.}
proc newObjRC1(typ: PNimType, size: int): pointer {.compilerRtl.} =
# generates a new object and sets its reference counter to 1
@ -476,12 +478,14 @@ proc newObjRC1(typ: PNimType, size: int): pointer {.compilerRtl.} =
sysAssert(allocInv(gch.region), "newObjRC1 end")
when defined(memProfiler): nimProfile(size)
{.push overflowChecks: on.}
proc newSeqRC1(typ: PNimType, len: int): pointer {.compilerRtl.} =
let size = addInt(mulInt(len, typ.base.size), GenericSeqSize)
let size = len * typ.base.size + GenericSeqSize
result = newObjRC1(typ, size)
cast[PGenericSeq](result).len = len
cast[PGenericSeq](result).reserved = len
when defined(memProfiler): nimProfile(size)
{.pop.}
proc growObj(old: pointer, newsize: int, gch: var GcHeap): pointer =
collectCT(gch)