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c3344862b0
This implements "deterministic" exception handling for Nim based on goto instead of setjmp. This means raising an exception is much cheaper than in C++'s table based implementations. Supports hard realtime systems. Default for --gc:arc and the C target because it's generally a good idea and arc is all about deterministic behavior. Note: This implies that fatal runtime traps are not catchable anymore! This needs to be documented.
66 lines
1.6 KiB
Nim
66 lines
1.6 KiB
Nim
#
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#
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# Nim's Runtime Library
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# (c) Copyright 2019 Andreas Rumpf
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#
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# See the file "copying.txt", included in this
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# distribution, for details about the copyright.
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#
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{.push profiler: off.}
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when defined(nimHasExceptionsQuery):
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const gotoBasedExceptions = compileOption("exceptions", "goto")
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else:
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const gotoBasedExceptions = false
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when hostOS == "standalone":
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include "$projectpath/panicoverride"
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proc sysFatal(exceptn: typedesc, message: string) {.inline.} =
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panic(message)
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proc sysFatal(exceptn: typedesc, message, arg: string) {.inline.} =
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rawoutput(message)
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panic(arg)
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elif (defined(nimQuirky) or gotoBasedExceptions) and not defined(nimscript):
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import ansi_c
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proc name(t: typedesc): string {.magic: "TypeTrait".}
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proc sysFatal(exceptn: typedesc, message, arg: string) {.inline, noreturn.} =
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writeStackTrace()
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var buf = newStringOfCap(200)
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add(buf, "Error: unhandled exception: ")
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add(buf, message)
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add(buf, arg)
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add(buf, " [")
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add(buf, name exceptn)
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add(buf, "]\n")
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cstderr.rawWrite buf
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quit 1
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proc sysFatal(exceptn: typedesc, message: string) {.inline, noreturn.} =
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sysFatal(exceptn, message, "")
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else:
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proc sysFatal(exceptn: typedesc, message: string) {.inline, noreturn.} =
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when declared(owned):
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var e: owned(ref exceptn)
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else:
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var e: ref exceptn
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new(e)
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e.msg = message
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raise e
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proc sysFatal(exceptn: typedesc, message, arg: string) {.inline, noreturn.} =
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when declared(owned):
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var e: owned(ref exceptn)
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else:
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var e: ref exceptn
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new(e)
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e.msg = message & arg
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raise e
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{.pop.}
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