[MS ABI] Hook clang up to the new EH instructions

The new EH instructions make it possible for LLVM to generate .xdata
tables that the MSVC personality routines will be happy about.  Because
this is experimental, hide it behind a -cc1 flag (-fnew-ms-eh).

Differential Revision: http://reviews.llvm.org/D11405

llvm-svn: 243767

1 files changed, 4 insertions, 8 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index ec3c75c..9bf4161 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -826,15 +826,11 @@ static void TryMarkNoThrow(llvm::Function *F) {
   // can't do this on functions that can be overwritten.
   if (F->mayBeOverridden()) return;
 
-  for (llvm::Function::iterator FI = F->begin(), FE = F->end(); FI != FE; ++FI)
-    for (llvm::BasicBlock::iterator
-           BI = FI->begin(), BE = FI->end(); BI != BE; ++BI)
-      if (llvm::CallInst *Call = dyn_cast<llvm::CallInst>(&*BI)) {
-        if (!Call->doesNotThrow())
-          return;
-      } else if (isa<llvm::ResumeInst>(&*BI)) {
+  for (llvm::BasicBlock &BB : *F)
+    for (llvm::Instruction &I : BB)
+      if (I.mayThrow())
         return;
-      }
+
   F->setDoesNotThrow();
 }