[D-runtime] [D-Programming-Language/druntime] 1117e5: implemented proper exception chaining on Posix

[Don Clugston]

Excellent!
The rule I used on Windows is that chaining goes in historical order
(the first Error stays as the Master exception and subsequent Errors
are chained to it). This rule applies in all cases except when an
Error is thrown when an Exception is in flight; this is ONLY time when
queue-jumping occurs.
BTW the DMD test suite has some harsh tests for exception chaining,
they are enabled only for Windows at the moment.
set version  = TdplExceptionChaining in:
test/runnable/eh.d
See also
test/runnable/test4.d


On 29 March 2011 00:09, Sean Kelly <sean at invisibleduck.org> wrote:
> These changes should bring Posix exception chaining in line with Windows.  The basic rule is that when a new (non-Error) Throwable T is thrown past an in-flight Throwable F it is replaced by F and appended to F's chain.  If T is an Error then F is appended to T's chain and T continues to meander up the stack.  I wasn't sure what to do if both T and F were of type Error, so I stuck to the aforementioned rule for now.  I've tested this for a few moderately complex cases, but haven't gotten really fancy with nested exception generation.  Hopefully the test suite will prove things out further.
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