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--exception:goto switch for deterministic exception handling (#12977)

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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.
This commit is contained in:
Andreas Rumpf 2020-01-01 10:01:49 +01:00 • committed by GitHub
commit c3344862b0
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23 changed files with 640 additions and 183 deletions
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12
lib/system.nim
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@ -3105,7 +3105,7 @@ when not defined(js):
when defined(nimV2):
type
TNimNode {.compilerproc.} = object # to keep the code generator simple
DestructorProc = proc (p: pointer) {.nimcall, benign.}
DestructorProc = proc (p: pointer) {.nimcall, benign, raises: [].}
TNimType {.compilerproc.} = object
destructor: pointer
size: int
@ -3120,6 +3120,12 @@ when not defined(js):
{.pop.}
when not defined(js) and not defined(nimscript):
proc writeStackTrace*() {.tags: [], gcsafe, raises: [].}
## Writes the current stack trace to ``stderr``. This is only works
## for debug builds. Since it's usually used for debugging, this
## is proclaimed to have no IO effect!
when not declared(sysFatal):
include "system/fatal"
@ -3693,10 +3699,6 @@ when not defined(JS): #and not defined(nimscript):
proc unsetControlCHook*()
## Reverts a call to setControlCHook.
proc writeStackTrace*() {.tags: [], gcsafe.}
## Writes the current stack trace to ``stderr``. This is only works
## for debug builds. Since it's usually used for debugging, this
## is proclaimed to have no IO effect!
when hostOS != "standalone":
proc getStackTrace*(): string {.gcsafe.}
## Gets the current stack trace. This only works for debug builds.