src/passes/NoInline.cpp

/*
 * Copyright 2023 WebAssembly Community Group participants
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

//
// Mark functions as no-inline based on name wildcards. For example:
//
//  --no-inline=*leave-alone* --inlining
//
// That will mark all functions with names like "runtime-leave-alone-1234" as
// no-inline, and as a result the inlining pass that happens afterwards will not
// inline them.
//
// Note that this is itself a pass, which does work - it marks things in the
// IR - and so the order of operations matters. If we did
//
//  --inlining --no-inline=*leave-alone*
//
// then we'd first perform the inlining and then the marking, which would mean
// the marking has no effect.
//

#include "pass.h"
#include "support/string.h"
#include "wasm.h"

namespace wasm {

namespace {

enum NoInlineMode { Full = 0, Partial = 1, Both = 2 };

struct NoInline : public Pass {
  NoInlineMode mode;

  NoInline(NoInlineMode mode) : mode(mode) {}

  void run(Module* module) override {
    std::string pattern =
      getArgument(name, "Usage usage:  wasm-opt --" + name + "=WILDCARD");

    for (auto& func : module->functions) {
      if (!String::wildcardMatch(pattern, func->name.toString())) {
        continue;
      }

      if (mode == Full || mode == Both) {
        func->noFullInline = true;
      }
      if (mode == Partial || mode == Both) {
        func->noPartialInline = true;
      }
    }
  }
};

} // anonymous namespace

Pass* createNoInlinePass() { return new NoInline(NoInlineMode::Both); }
Pass* createNoFullInlinePass() { return new NoInline(NoInlineMode::Full); }
Pass* createNoPartialInlinePass() {
  return new NoInline(NoInlineMode::Partial);
}

} // namespace wasm