[PATCH] D13623: [WinEH] Iterate state changes instead of invokes

[Joseph Tremoulet via llvm-commits]

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

Add an iterator that can walk across blocks and which visits the state
transitions rather than state ranges, with explicit transitions to -1
indicating the presence of top-level calls that may throw and cause the
current function to unwind to caller.  This will simplify code that needs
to identify nested try regions.

Refactor SEH and C++EH table generation to use the new
InvokeStateChangeIterator, and remove the InvokeLabelIterator they were
using.


http://reviews.llvm.org/D13623

Files:
  lib/CodeGen/AsmPrinter/WinException.cpp
  lib/CodeGen/AsmPrinter/WinException.h

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