[WinEH] Run cleanup handlers when an exception is thrown

Generate tables in the .xdata section representing what actions to take
when an exception is thrown.  This currently fills in state for
cleanups, catch handlers are still unfinished.

llvm-svn: 233636

1 files changed, 17 insertions, 11 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/EHStreamer.cpp b/llvm/lib/CodeGen/AsmPrinter/EHStreamer.cpp
index 14df4c91625..6f64d8f790a 100644
--- a/llvm/lib/CodeGen/AsmPrinter/EHStreamer.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/EHStreamer.cpp
@@ -188,20 +188,12 @@ bool EHStreamer::callToNoUnwindFunction(const MachineInstr *MI) {
   return MarkedNoUnwind;
 }
 
-/// Compute the call-site table.  The entry for an invoke has a try-range
-/// containing the call, a non-zero landing pad, and an appropriate action.  The
-/// entry for an ordinary call has a try-range containing the call and zero for
-/// the landing pad and the action.  Calls marked 'nounwind' have no entry and
-/// must not be contained in the try-range of any entry - they form gaps in the
-/// table.  Entries must be ordered by try-range address.
-void EHStreamer::
-computeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
-                     const SmallVectorImpl<const LandingPadInfo *> &LandingPads,
-                     const SmallVectorImpl<unsigned> &FirstActions) {
+void EHStreamer::computePadMap(
+    const SmallVectorImpl<const LandingPadInfo *> &LandingPads,
+    RangeMapType &PadMap) {
   // Invokes and nounwind calls have entries in PadMap (due to being bracketed
   // by try-range labels when lowered).  Ordinary calls do not, so appropriate
   // try-ranges for them need be deduced so we can put them in the LSDA.
-  RangeMapType PadMap;
   for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
     const LandingPadInfo *LandingPad = LandingPads[i];
     for (unsigned j = 0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
@@ -211,6 +203,20 @@ computeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
       PadMap[BeginLabel] = P;
     }
   }
+}
+
+/// Compute the call-site table.  The entry for an invoke has a try-range
+/// containing the call, a non-zero landing pad, and an appropriate action.  The
+/// entry for an ordinary call has a try-range containing the call and zero for
+/// the landing pad and the action.  Calls marked 'nounwind' have no entry and
+/// must not be contained in the try-range of any entry - they form gaps in the
+/// table.  Entries must be ordered by try-range address.
+void EHStreamer::
+computeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
+                     const SmallVectorImpl<const LandingPadInfo *> &LandingPads,
+                     const SmallVectorImpl<unsigned> &FirstActions) {
+  RangeMapType PadMap;
+  computePadMap(LandingPads, PadMap);
 
   // The end label of the previous invoke or nounwind try-range.
   MCSymbol *LastLabel = nullptr;