[MS ABI] Disregard restrictive exception specifications

MSVC treats all non-empty exception specifications the same way: all
exceptions are permitted.  The .xdata tables provide a way to
efficiently lower exception specifications *but* this probably has to be
implemented as a catch-all/rethrow mechanism instead of the Itanium way.

This fixes PR23092.

llvm-svn: 233787

1 files changed, 8 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGException.cpp b/clang/lib/CodeGen/CGException.cpp
index 1925c57d1bd..f10d2e1ecc6 100644
--- a/clang/lib/CodeGen/CGException.cpp
+++ b/clang/lib/CodeGen/CGException.cpp
@@ -458,6 +458,10 @@ void CodeGenFunction::EmitStartEHSpec(const Decl *D) {
       EHStack.pushTerminate();
     }
   } else if (EST == EST_Dynamic || EST == EST_DynamicNone) {
+    // TODO: Revisit exception specifications for the MS ABI.  There is a way to
+    // encode these in an object file but MSVC doesn't do anything with it.
+    if (getTarget().getCXXABI().isMicrosoft())
+      return;
     unsigned NumExceptions = Proto->getNumExceptions();
     EHFilterScope *Filter = EHStack.pushFilter(NumExceptions);
 
@@ -532,6 +536,10 @@ void CodeGenFunction::EmitEndEHSpec(const Decl *D) {
       EHStack.popTerminate();
     }
   } else if (EST == EST_Dynamic || EST == EST_DynamicNone) {
+    // TODO: Revisit exception specifications for the MS ABI.  There is a way to
+    // encode these in an object file but MSVC doesn't do anything with it.
+    if (getTarget().getCXXABI().isMicrosoft())
+      return;
     EHFilterScope &filterScope = cast<EHFilterScope>(*EHStack.begin());
     emitFilterDispatchBlock(*this, filterScope);
     EHStack.popFilter();