/// The isolated kind is used to rappresent isolated root and functions.

//
// This file is distributed under the MIT License. See LICENSE.md for details.
//

#include <optional>
#include <string>

#include "llvm/ADT/STLExtras.h"

#include "revng/Model/Binary.h"
#include "revng/Model/FunctionTags.h"
#include "revng/Model/IRHelpers.h"
#include "revng/Pipeline/AllRegistries.h"
#include "revng/Pipeline/Context.h"
#include "revng/Pipeline/Target.h"
#include "revng/Pipes/FileContainer.h"
#include "revng/Pipes/FunctionKind.h"
#include "revng/Pipes/Kinds.h"
#include "revng/Pipes/ModelGlobal.h"
#include "revng/Pipes/RootKind.h"
#include "revng/Pipes/TaggedFunctionKind.h"
#include "revng/Support/Assert.h"
#include "revng/Support/MetaAddress.h"

using namespace pipeline;
using namespace ::revng::kinds;
using namespace llvm;

std::optional<pipeline::Target>
TaggedFunctionKind::symbolToTarget(const llvm::Function &Symbol) const {
  if (not Tag->isExactTagOf(&Symbol) or Symbol.isDeclaration())
    return std::nullopt;

  auto Address = getMetaAddressOfIsolatedFunction(Symbol);
  revng_assert(Address.isValid());
  return pipeline::Target({ Address.toString() }, *this);
}

void TaggedFunctionKind::appendAllTargets(const pipeline::Context &Context,
                                          pipeline::TargetsList &Out) const {
  const auto &Model = getModelFromContext(Context);
  for (const auto &Function : Model->Functions()) {
    Out.push_back(Target(Function.Entry().toString(), *this));
  }
}

cppcoro::generator<std::pair<const model::Function *, llvm::Function *>>
TaggedFunctionKind::getFunctionsAndCommit(pipeline::ExecutionContext &EC,
                                          llvm::Module &Module,
                                          llvm::StringRef ContainerName) {
  std::map<MetaAddress, llvm::Function *> AddressToFunction;

  for (llvm::Function &Function : Module.functions()) {
    if (not FunctionTags::Isolated.isTagOf(&Function)) {
      continue;
    }

    AddressToFunction.emplace(getMetaAddressOfIsolatedFunction(Function),
                              &Function);
  }
  auto &Binary = getModelFromContext(EC);

  for (const model::Function &Function :
       revng::getFunctionsAndCommit(EC, ContainerName)) {
    auto Iter = AddressToFunction.find(Function.Entry());
    using ResultPair = std::pair<const model::Function *, llvm::Function *>;
    if (Iter == AddressToFunction.end()) {
      co_yield ResultPair(&Function, nullptr);
    } else {
      co_yield ResultPair(&Function, Iter->second);
    }
  }
}