Validate that the input to 'Pat' patterns is sane.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24393 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 0 deletions

diff --git a/utils/TableGen/DAGISelEmitter.cpp b/utils/TableGen/DAGISelEmitter.cpp
index bdae7615f9..68248d7d66 100644
--- a/utils/TableGen/DAGISelEmitter.cpp
+++ b/utils/TableGen/DAGISelEmitter.cpp
@@ -1212,6 +1212,14 @@ void DAGISelEmitter::ParsePatterns() {
     // never do anything with this pattern: report it to the user.
     if (!Pattern->InferAllTypes())
       Pattern->error("Could not infer all types in pattern!");
+
+    // Validate that the input pattern is correct.
+    {
+      std::map<std::string, TreePatternNode*> InstInputs;
+      std::map<std::string, Record*> InstResults;
+      FindPatternInputsAndOutputs(Pattern, Pattern->getOnlyTree(),
+                                  InstInputs, InstResults);
+    }
     
     ListInit *LI = Patterns[i]->getValueAsListInit("ResultInstrs");
     if (LI->getSize() == 0) continue;  // no pattern.