[PATCH] D17721: [WinEH] Make setjmp work correctly with EH

[David Majnemer via llvm-commits]

majnemer created this revision.
majnemer added reviewers: rnk, andrew.w.kaylor, JosephTremoulet.
majnemer added a subscriber: llvm-commits.

32-bit X86 EH on Windows utilizes a stack of registration nodes
allocated and deallocated on entry/exit.  A registration node contains a
bunch of EH personality specific information like which try-state we are
currently in.

Because a setjmp target allows control flow from arbitrary program
points, there is no way to ensure that the try-state we are in is
correctly updated once we transfer control.

MSVC compatible compilers, like MSVC and ICC, utilize runtime helpers to
reinitialize the try-state when a longjmp occurs.  This is implemented
by adding additional arguments to _setjmp3: the desired try-state and
a helper routine to update the try-state.

http://reviews.llvm.org/D17721

Files:
  lib/Target/X86/X86WinEHState.cpp
  test/CodeGen/WinEH/wineh-setjmp.ll

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