Improve MLIR-Query by adding matcher combinators

	Limit backward-slice with nested matching
	Add variadic operators

Author: chios202

mlir/include/mlir/Query/Matcher/Marshallers.h

@@ -108,6 +108,9 @@ class MatcherDescriptor {
                                 const llvm::ArrayRef<ParserValue> args,
                                 Diagnostics *error) const = 0;
 
+  // If the matcher is variadic, it can take any number of arguments.
+  virtual bool isVariadic() const = 0;
+
   // Returns the number of arguments accepted by the matcher.
   virtual unsigned getNumArgs() const = 0;
 
@@ -140,6 +143,8 @@ class FixedArgCountMatcherDescriptor : public MatcherDescriptor {
     return marshaller(matcherFunc, matcherName, nameRange, args, error);
   }
 
+  bool isVariadic() const override { return false; }
+
   unsigned getNumArgs() const override { return argKinds.size(); }
 
   void getArgKinds(unsigned argNo, std::vector<ArgKind> &kinds) const override {
@@ -153,6 +158,54 @@ class FixedArgCountMatcherDescriptor : public MatcherDescriptor {
   const std::vector<ArgKind> argKinds;
 };
 
+class VariadicOperatorMatcherDescriptor : public MatcherDescriptor {
+public:
+  using VarOp = DynMatcher::VariadicOperator;
+  VariadicOperatorMatcherDescriptor(unsigned minCount, unsigned maxCount,
+                                    VarOp varOp, StringRef matcherName)
+      : minCount(minCount), maxCount(maxCount), varOp(varOp),
+        matcherName(matcherName) {}
+
+  VariantMatcher create(SourceRange nameRange, ArrayRef<ParserValue> args,
+                        Diagnostics *error) const override {
+    if (args.size() < minCount || maxCount < args.size()) {
+      addError(error, nameRange, ErrorType::RegistryWrongArgCount,
+               {llvm::Twine("requires between "), llvm::Twine(minCount),
+                llvm::Twine(" and "), llvm::Twine(maxCount),
+                llvm::Twine(" args, got "), llvm::Twine(args.size())});
+      return VariantMatcher();
+    }
+
+    std::vector<VariantMatcher> innerArgs;
+    for (size_t i = 0, e = args.size(); i != e; ++i) {
+      const ParserValue &arg = args[i];
+      const VariantValue &value = arg.value;
+      if (!value.isMatcher()) {
+        addError(error, arg.range, ErrorType::RegistryWrongArgType,
+                 {llvm::Twine(i + 1), llvm::Twine("Matcher: "),
+                  llvm::Twine(value.getTypeAsString())});
+        return VariantMatcher();
+      }
+      innerArgs.push_back(value.getMatcher());
+    }
+    return VariantMatcher::VariadicOperatorMatcher(varOp, std::move(innerArgs));
+  }
+
+  bool isVariadic() const override { return true; }
+
+  unsigned getNumArgs() const override { return 0; }
+
+  void getArgKinds(unsigned argNo, std::vector<ArgKind> &kinds) const override {
+    kinds.push_back(ArgKind(ArgKind::Matcher));
+  }
+
+private:
+  const unsigned minCount;
+  const unsigned maxCount;
+  const VarOp varOp;
+  const StringRef matcherName;
+};
+
 // Helper function to check if argument count matches expected count
 inline bool checkArgCount(SourceRange nameRange, size_t expectedArgCount,
                           llvm::ArrayRef<ParserValue> args,
@@ -224,6 +277,14 @@ makeMatcherAutoMarshall(ReturnType (*matcherFunc)(ArgTypes...),
       reinterpret_cast<void (*)()>(matcherFunc), matcherName, argKinds);
 }
 
+// Variadic operator overload.
+template <unsigned MinCount, unsigned MaxCount>
+std::unique_ptr<MatcherDescriptor>
+makeMatcherAutoMarshall(VariadicOperatorMatcherFunc<MinCount, MaxCount> func,
+                        StringRef matcherName) {
+  return std::make_unique<VariadicOperatorMatcherDescriptor>(
+      MinCount, MaxCount, func.varOp, matcherName);
+}
 } // namespace mlir::query::matcher::internal
 
 #endif // MLIR_TOOLS_MLIRQUERY_MATCHER_MARSHALLERS_H

mlir/include/mlir/Query/Matcher/MatchFinder.h

@@ -21,7 +21,9 @@
 
 namespace mlir::query::matcher {
 
-/// A class that provides utilities to find operations in the IR.
+/// Finds and collects matches from the IR. After construction
+/// `collectMatches` can be used to traverse the IR and apply
+/// matchers.
 class MatchFinder {
 
 public:

mlir/include/mlir/Query/Matcher/MatchersInternal.h

@@ -8,11 +8,11 @@
 //
 // Implements the base layer of the matcher framework.
 //
-// Matchers are methods that return a Matcher which provides a method one of the
-// following methods: match(Operation *op), match(Operation *op,
-// SetVector<Operation *> &matchedOps)
+// Matchers are methods that return a Matcher which provide a method
+// `match(...)` method. The method's parameters define the context of the match.
+// Support includes simple (unary) matchers as well as matcher combinators.
+// (anyOf, allOf, etc.)
 //
-// The matcher functions are defined in include/mlir/IR/Matchers.h.
 // This file contains the wrapper classes needed to construct matchers for
 // mlir-query.
 //
@@ -25,6 +25,15 @@
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
 
 namespace mlir::query::matcher {
+class DynMatcher;
+namespace internal {
+
+bool allOfVariadicOperator(Operation *op, SetVector<Operation *> *matchedOps,
+                           ArrayRef<DynMatcher> innerMatchers);
+bool anyOfVariadicOperator(Operation *op, SetVector<Operation *> *matchedOps,
+                           ArrayRef<DynMatcher> innerMatchers);
+
+} // namespace internal
 
 // Defaults to false if T has no match() method with the signature:
 // match(Operation* op).
@@ -84,6 +93,26 @@ class MatcherFnImpl : public MatcherInterface {
   MatcherFn matcherFn;
 };
 
+// VariadicMatcher takes a vector of Matchers and returns true if any Matchers
+// match the given operation.
+using VariadicOperatorFunction = bool (*)(Operation *op,
+                                          SetVector<Operation *> *matchedOps,
+                                          ArrayRef<DynMatcher> innerMatchers);
+
+template <VariadicOperatorFunction Func>
+class VariadicMatcher : public MatcherInterface {
+public:
+  VariadicMatcher(std::vector<DynMatcher> matchers) : matchers(matchers) {}
+
+  bool match(Operation *op) override { return Func(op, nullptr, matchers); }
+  bool match(Operation *op, SetVector<Operation *> &matchedOps) override {
+    return Func(op, &matchedOps, matchers);
+  }
+
+private:
+  std::vector<DynMatcher> matchers;
+};
+
 // Matcher wraps a MatcherInterface implementation and provides match()
 // methods that redirect calls to the underlying implementation.
 class DynMatcher {
@@ -92,6 +121,31 @@ class DynMatcher {
   DynMatcher(MatcherInterface *implementation)
       : implementation(implementation) {}
 
+  // Construct from a variadic function.
+  enum VariadicOperator {
+    // Matches operations for which all provided matchers match.
+    AllOf,
+    // Matches operations for which at least one of the provided matchers
+    // matches.
+    AnyOf
+  };
+
+  static std::unique_ptr<DynMatcher>
+  constructVariadic(VariadicOperator Op,
+                    std::vector<DynMatcher> innerMatchers) {
+    switch (Op) {
+    case AllOf:
+      return std::make_unique<DynMatcher>(
+          new VariadicMatcher<internal::allOfVariadicOperator>(
+              std::move(innerMatchers)));
+    case AnyOf:
+      return std::make_unique<DynMatcher>(
+          new VariadicMatcher<internal::anyOfVariadicOperator>(
+              std::move(innerMatchers)));
+    }
+    llvm_unreachable("Invalid Op value.");
+  }
+
   template <typename MatcherFn>
   static std::unique_ptr<DynMatcher>
   constructDynMatcherFromMatcherFn(MatcherFn &matcherFn) {
@@ -113,6 +167,53 @@ class DynMatcher {
   std::string functionName;
 };
 
+// VariadicOperatorMatcher related types.
+template <typename... Ps>
+class VariadicOperatorMatcher {
+public:
+  VariadicOperatorMatcher(DynMatcher::VariadicOperator varOp, Ps &&...params)
+      : varOp(varOp), params(std::forward<Ps>(params)...) {}
+
+  operator std::unique_ptr<DynMatcher>() const & {
+    return DynMatcher::constructVariadic(
+        varOp, getMatchers(std::index_sequence_for<Ps...>()));
+  }
+
+  operator std::unique_ptr<DynMatcher>() && {
+    return DynMatcher::constructVariadic(
+        varOp, std::move(*this).getMatchers(std::index_sequence_for<Ps...>()));
+  }
+
+private:
+  // Helper method to unpack the tuple into a vector.
+  template <std::size_t... Is>
+  std::vector<DynMatcher> getMatchers(std::index_sequence<Is...>) const & {
+    return {DynMatcher(std::get<Is>(params))...};
+  }
+
+  template <std::size_t... Is>
+  std::vector<DynMatcher> getMatchers(std::index_sequence<Is...>) && {
+    return {DynMatcher(std::get<Is>(std::move(params)))...};
+  }
+
+  const DynMatcher::VariadicOperator varOp;
+  std::tuple<Ps...> params;
+};
+
+// Overloaded function object to generate VariadicOperatorMatcher objects from
+// arbitrary matchers.
+template <unsigned MinCount, unsigned MaxCount>
+struct VariadicOperatorMatcherFunc {
+  DynMatcher::VariadicOperator varOp;
+
+  template <typename... Ms>
+  VariadicOperatorMatcher<Ms...> operator()(Ms &&...Ps) const {
+    static_assert(MinCount <= sizeof...(Ms) && sizeof...(Ms) <= MaxCount,
+                  "invalid number of parameters for variadic matcher");
+    return VariadicOperatorMatcher<Ms...>(varOp, std::forward<Ms>(Ps)...);
+  }
+};
+
 } // namespace mlir::query::matcher
 
 #endif // MLIR_TOOLS_MLIRQUERY_MATCHER_MATCHERSINTERNAL_H

mlir/include/mlir/Query/Matcher/SliceMatchers.h

@@ -6,7 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file provides matchers for MLIRQuery that peform slicing analysis
+// This file defines slicing-analysis matchers that extend and abstract the
+// core implementations from `SliceAnalysis.h`.
 //
 //===----------------------------------------------------------------------===//
 
@@ -15,9 +16,9 @@
 
 #include "mlir/Analysis/SliceAnalysis.h"
 
-/// A matcher encapsulating `getBackwardSlice` method from SliceAnalysis.h.
-/// Additionally, it limits the slice computation to a certain depth level using
-/// a custom filter.
+/// Computes the backward-slice of all transitive defs reachable from `rootOp`,
+/// if `innerMatcher` matches. The traversal stops once the desired depth level
+/// is reached.
 ///
 /// Example: starting from node 9, assuming the matcher
 /// computes the slice for the first two depth levels:
@@ -116,6 +117,83 @@ bool BackwardSliceMatcher<Matcher>::matches(
                            : backwardSlice.size() >= 1;
 }
 
+/// Computes the backward-slice of all transitive defs reachable from `rootOp`,
+/// if `innerMatcher` matches. Traversal stops where `filterMatcher` matches.
+template <typename BaseMatcher, typename Filter>
+class PredicateBackwardSliceMatcher {
+public:
+  PredicateBackwardSliceMatcher(BaseMatcher innerMatcher, Filter filterMatcher,
+                                bool inclusive, bool omitBlockArguments,
+                                bool omitUsesFromAbove)
+      : innerMatcher(std::move(innerMatcher)),
+        filterMatcher(std::move(filterMatcher)), inclusive(inclusive),
+        omitBlockArguments(omitBlockArguments),
+        omitUsesFromAbove(omitUsesFromAbove) {}
+
+  bool match(Operation *rootOp, SetVector<Operation *> &backwardSlice) {
+    backwardSlice.clear();
+    BackwardSliceOptions options;
+    options.inclusive = inclusive;
+    options.omitUsesFromAbove = omitUsesFromAbove;
+    options.omitBlockArguments = omitBlockArguments;
+    if (innerMatcher.match(rootOp)) {
+      options.filter = [&](Operation *subOp) {
+        return !filterMatcher.match(subOp);
+      };
+      getBackwardSlice(rootOp, &backwardSlice, options);
+      return options.inclusive ? backwardSlice.size() > 1
+                               : backwardSlice.size() >= 1;
+    }
+    return false;
+  }
+
+private:
+  BaseMatcher innerMatcher;
+  Filter filterMatcher;
+  bool inclusive;
+  bool omitBlockArguments;
+  bool omitUsesFromAbove;
+};
+
+/// Computes the forward-slice of all users reachable from `rootOp`,
+/// if `innerMatcher` matches. Traversal stops where `filterMatcher` matches.
+template <typename BaseMatcher, typename Filter>
+class PredicateForwardSliceMatcher {
+public:
+  PredicateForwardSliceMatcher(BaseMatcher innerMatcher, Filter filterMatcher,
+                               bool inclusive)
+      : innerMatcher(std::move(innerMatcher)),
+        filterMatcher(std::move(filterMatcher)), inclusive(inclusive) {}
+
+  bool match(Operation *rootOp, SetVector<Operation *> &forwardSlice) {
+    forwardSlice.clear();
+    ForwardSliceOptions options;
+    options.inclusive = inclusive;
+    if (innerMatcher.match(rootOp)) {
+      options.filter = [&](Operation *subOp) {
+        return !filterMatcher.match(subOp);
+      };
+      getForwardSlice(rootOp, &forwardSlice, options);
+      return options.inclusive ? forwardSlice.size() > 1
+                               : forwardSlice.size() >= 1;
+    }
+    return false;
+  }
+
+private:
+  BaseMatcher innerMatcher;
+  Filter filterMatcher;
+  bool inclusive;
+};
+
+namespace internal {
+const matcher::VariadicOperatorMatcherFunc<1,
+                                           std::numeric_limits<unsigned>::max()>
+    anyOf = {matcher::DynMatcher::AnyOf};
+const matcher::VariadicOperatorMatcherFunc<1,
+                                           std::numeric_limits<unsigned>::max()>
+    allOf = {matcher::DynMatcher::AllOf};
+} // namespace internal
 /// Matches transitive defs of a top-level operation up to N levels.
 template <typename Matcher>
 inline BackwardSliceMatcher<Matcher>
@@ -127,7 +205,7 @@ m_GetDefinitions(Matcher innerMatcher, int64_t maxDepth, bool inclusive,
                                        omitUsesFromAbove);
 }
 
-/// Matches all transitive defs of a top-level operation up to N levels
+/// Matches all transitive defs of a top-level operation up to N levels.
 template <typename Matcher>
 inline BackwardSliceMatcher<Matcher> m_GetAllDefinitions(Matcher innerMatcher,
                                                          int64_t maxDepth) {
@@ -136,6 +214,28 @@ inline BackwardSliceMatcher<Matcher> m_GetAllDefinitions(Matcher innerMatcher,
                                        false, false);
 }
 
+/// Matches all transitive defs of a top-level operation and stops where
+/// `filterMatcher` rejects.
+template <typename BaseMatcher, typename Filter>
+inline PredicateBackwardSliceMatcher<BaseMatcher, Filter>
+m_GetDefinitionsByPredicate(BaseMatcher innerMatcher, Filter filterMatcher,
+                            bool inclusive, bool omitBlockArguments,
+                            bool omitUsesFromAbove) {
+  return PredicateBackwardSliceMatcher<BaseMatcher, Filter>(
+      std::move(innerMatcher), std::move(filterMatcher), inclusive,
+      omitBlockArguments, omitUsesFromAbove);
+}
+
+/// Matches all users of a top-level operation and stops where
+/// `filterMatcher` rejects.
+template <typename BaseMatcher, typename Filter>
+inline PredicateForwardSliceMatcher<BaseMatcher, Filter>
+m_GetUsersByPredicate(BaseMatcher innerMatcher, Filter filterMatcher,
+                      bool inclusive) {
+  return PredicateForwardSliceMatcher<BaseMatcher, Filter>(
+      std::move(innerMatcher), std::move(filterMatcher), inclusive);
+}
+
 } // namespace mlir::query::matcher
 
 #endif // MLIR_TOOLS_MLIRQUERY_MATCHERS_SLICEMATCHERS_H