lld/wasm/InputEvent.h

//===- InputEvent.h ---------------------------------------------*- 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
//
//===----------------------------------------------------------------------===//
//
// Wasm events are features that suspend the current execution and transfer the
// control flow to a corresponding handler. Currently the only supported event
// kind is exceptions.
//
//===----------------------------------------------------------------------===//

#ifndef LLD_WASM_INPUT_EVENT_H
#define LLD_WASM_INPUT_EVENT_H

#include "Config.h"
#include "InputFiles.h"
#include "WriterUtils.h"
#include "lld/Common/ErrorHandler.h"
#include "llvm/Object/Wasm.h"

namespace lld {
namespace wasm {

// Represents a single Wasm Event within an input file. These are combined to
// form the final EVENTS section.
class InputEvent {
public:
  InputEvent(const WasmSignature &s, const WasmEvent &e, ObjFile *f)
      : file(f), event(e), signature(s), live(!config->gcSections) {}

  StringRef getName() const { return event.SymbolName; }
  const WasmEventType &getType() const { return event.Type; }

  uint32_t getEventIndex() const { return eventIndex.getValue(); }
  bool hasEventIndex() const { return eventIndex.hasValue(); }
  void setEventIndex(uint32_t index) {
    assert(!hasEventIndex());
    eventIndex = index;
  }

  ObjFile *file;
  WasmEvent event;
  const WasmSignature &signature;

  bool live = false;

protected:
  llvm::Optional<uint32_t> eventIndex;
};

} // namespace wasm

inline std::string toString(const wasm::InputEvent *e) {
  return (toString(e->file) + ":(" + e->getName() + ")").str();
}

} // namespace lld

#endif // LLD_WASM_INPUT_EVENT_H