Add a 'verifyPasses' flag to the PassManager that specifies if the IR should be verified after each pass. This also adds a "verify-each" flag to mlir-opt to optionally disable running the verifier after each pass.

PiperOrigin-RevId: 236703760

mlir/include/mlir/Pass/PassManager.h

@@ -34,7 +34,8 @@ class ModulePassExecutor;
 /// The main pass manager and pipeline builder.
 class PassManager {
 public:
-  PassManager();
+  // If verifyPasses is true, the verifier is run after each pass.
+  PassManager(bool verifyPasses = true);
   ~PassManager();
 
   /// Add an opaque pass pointer to the current manager. This takes ownership
@@ -61,6 +62,9 @@ private:
 
   /// The top level module pass executor.
   std::unique_ptr<detail::ModulePassExecutor> mpe;
+
+  /// Flag that specifies if the IR should be verified after each pass has run.
+  bool verifyPasses;
 };
 
 } // end namespace mlir

mlir/lib/Pass/Pass.cpp

@@ -144,27 +144,20 @@ private:
 /// Run all of the passes in this manager over the current function.
 bool detail::FunctionPassExecutor::run(Function *function,
                                        FunctionAnalysisManager &fam) {
-  for (auto &pass : passes) {
-    /// Create an execution state for this pass.
+  // Run each of the held passes.
+  for (auto &pass : passes)
     if (!pass->run(function, fam))
       return false;
-    // TODO: This should be opt-out and handled separately.
-    if (function->verify())
-      return false;
-  }
   return true;
 }
 
 /// Run all of the passes in this manager over the current module.
 bool detail::ModulePassExecutor::run(Module *module,
                                      ModuleAnalysisManager &mam) {
-  for (auto &pass : passes) {
+  // Run each of the held passes.
+  for (auto &pass : passes)
     if (!pass->run(module, mam))
       return false;
-    // TODO: This should be opt-out and handled separately.
-    if (module->verify())
-      return false;
-  }
   return true;
 }
 
@@ -224,7 +217,28 @@ void ModuleToFunctionPassAdaptor::runOnModule() {
 // PassManager
 //===----------------------------------------------------------------------===//
 
-PassManager::PassManager() : mpe(new ModulePassExecutor()) {}
+namespace {
+/// Pass to verify a function and signal failure if necessary.
+class FunctionVerifier : public FunctionPass<FunctionVerifier> {
+  void runOnFunction() {
+    if (getFunction().verify())
+      signalPassFailure();
+    markAllAnalysesPreserved();
+  }
+};
+
+/// Pass to verify a module and signal failure if necessary.
+class ModuleVerifier : public ModulePass<ModuleVerifier> {
+  void runOnModule() {
+    if (getModule().verify())
+      signalPassFailure();
+    markAllAnalysesPreserved();
+  }
+};
+} // end anonymous namespace
+
+PassManager::PassManager(bool verifyPasses)
+    : mpe(new ModulePassExecutor()), verifyPasses(verifyPasses) {}
 
 PassManager::~PassManager() {}
 
@@ -246,6 +260,10 @@ void PassManager::addPass(Pass *pass) {
 void PassManager::addPass(ModulePassBase *pass) {
   nestedExecutorStack.clear();
   mpe->addPass(pass);
+
+  // Add a verifier run if requested.
+  if (verifyPasses)
+    mpe->addPass(new ModuleVerifier());
 }
 
 /// Add a function pass to the current manager. This takes ownership over the
@@ -256,7 +274,7 @@ void PassManager::addPass(FunctionPassBase *pass) {
   if (nestedExecutorStack.empty()) {
     /// Create an executor adaptor for this pass.
     auto *adaptor = new ModuleToFunctionPassAdaptor();
-    mpe->addPass(adaptor);
+    addPass(adaptor);
 
     /// Add the executor to the stack.
     fpe = &adaptor->getFunctionExecutor();
@@ -265,6 +283,10 @@ void PassManager::addPass(FunctionPassBase *pass) {
     fpe = cast<detail::FunctionPassExecutor>(nestedExecutorStack.back());
   }
   fpe->addPass(pass);
+
+  // Add a verifier run if requested.
+  if (verifyPasses)
+    fpe->addPass(new FunctionVerifier());
 }
 
 /// Run the passes within this manager on the provided module.

mlir/tools/mlir-opt/mlir-opt.cpp

@@ -68,6 +68,11 @@ static cl::opt<bool>
                                "expected-* lines on the corresponding line"),
                       cl::init(false));
 
+static cl::opt<bool>
+    verifyPasses("verify-each",
+                 cl::desc("Run the verifier after each transformation pass"),
+                 cl::init(true));
+
 static std::vector<const mlir::PassRegistryEntry *> *passList;
 
 enum OptResult { OptSuccess, OptFailure };
@@ -126,9 +131,7 @@ static OptResult performActions(SourceMgr &sourceMgr, MLIRContext *context) {
     return OptFailure;
 
   // Run each of the passes that were selected.
-  // TODO(riverriddle) Make sure that the verifer is run after each pass when it
-  // is no longer run by default within the PassManager.
-  PassManager pm;
+  PassManager pm(verifyPasses);
   for (const auto *passEntry : *passList)
     passEntry->addToPipeline(pm);
   if (!pm.run(module.get()))