[PATCH] D15842: [WinEH] Verify catchswitch handlers

[Joseph Tremoulet via llvm-commits]

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

The handler list must be nonempty and consist solely of CatchPads.


http://reviews.llvm.org/D15842

Files:
  lib/IR/Verifier.cpp
  test/Verifier/invalid-eh.ll

Index: test/Verifier/invalid-eh.ll
===================================================================
--- test/Verifier/invalid-eh.ll
+++ test/Verifier/invalid-eh.ll
@@ -5,6 +5,7 @@
 ; RUN: sed -e s/.T5:// %s | not opt -verify -disable-output 2>&1 | FileCheck --check-prefix=CHECK5 %s
 ; RUN: sed -e s/.T6:// %s | not opt -verify -disable-output 2>&1 | FileCheck --check-prefix=CHECK6 %s
 ; RUN: sed -e s/.T7:// %s | not opt -verify -disable-output 2>&1 | FileCheck --check-prefix=CHECK7 %s
+; RUN: sed -e s/.T8:// %s | not opt -verify -disable-output 2>&1 | FileCheck --check-prefix=CHECK8 %s
 
 declare void @g()
 
@@ -87,3 +88,11 @@
 ;T7:     catchpad within %cs2 []
 ;T7:     unreachable
 ;T7: }
+
+;T8: define void @f() personality void ()* @g {
+;T8:   entry:
+;T8:     ret void
+;T8:   switch1:
+;T8:     %cs1 = catchswitch within none [ label %switch1 ] unwind to caller
+;T8:     ; CHECK8: CatchSwitchInst handlers must be catchpads
+;T8: }
Index: lib/IR/Verifier.cpp
===================================================================
--- lib/IR/Verifier.cpp
+++ lib/IR/Verifier.cpp
@@ -3081,6 +3081,13 @@
              isa<CatchPadInst>(ParentPad),
          "CatchSwitchInst has an invalid parent.", ParentPad);
 
+  Assert(CatchSwitch.getNumHandlers(),
+         "CatchSwitchInst cannot have empty handler list", &CatchSwitch);
+
+  for (BasicBlock *Handler : CatchSwitch.handlers())
+    Assert(isa<CatchPadInst>(Handler->getFirstNonPHI()),
+           "CatchSwitchInst handlers must be catchpads", &CatchSwitch, Handler);
+
   visitTerminatorInst(CatchSwitch);
 }
 


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