ESIVerifyConnections.cpp

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//===- ESIVerifyConnections.cpp ---------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#include "circt/Dialect/ESI/ESIPasses.h"
#include "circt/Dialect/ESI/ESITypes.h"
 
#include "mlir/IR/BuiltinTypes.h"
#include "mlir/Pass/Pass.h"
 
namespace circt {
namespace esi {
#define GEN_PASS_DEF_VERIFYESICONNECTIONS
#include "circt/Dialect/ESI/ESIPasses.h.inc"
} // namespace esi
} // namespace circt
 
using namespace circt;
using namespace circt::esi;
 
namespace {
struct ESIVerifyConnectionsPass
    : public impl::VerifyESIConnectionsBase<ESIVerifyConnectionsPass> {
  void runOnOperation() override;
};
} // anonymous namespace
 
void ESIVerifyConnectionsPass::runOnOperation() {
  // Walk the tree and look for ops which produce ESI types. Check each one.
  getOperation()->walk([this](Operation *op) {
    for (const OpResult &v : op->getResults())
      if (isa<ChannelBundleType>(v.getType())) {
        if (v.hasOneUse())
          continue;
        mlir::InFlightDiagnostic error =
            op->emitError("bundles must have exactly one use");
        for (Operation *user : v.getUsers())
          error.attachNote(user->getLoc()) << "bundle used here";
        signalPassFailure();
 
      } else if (isa<ChannelType>(v.getType())) {
        if (std::distance(v.getUses().begin(), v.getUses().end()) <= 1)
          continue;
        mlir::InFlightDiagnostic error =
            op->emitError("channels must have at most one use");
        for (Operation *user : v.getUsers())
          error.attachNote(user->getLoc()) << "channel used here";
        signalPassFailure();
      }
  });
}
 
std::unique_ptr<OperationPass<>> circt::esi::createESIVerifyConnectionsPass() {
  return std::make_unique<ESIVerifyConnectionsPass>();
}