Compiler_Module_Binder.H

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/*
                          Aleph_w
 
  Data structures & Algorithms
  version 2.0.0b
  https://github.com/lrleon/Aleph-w
 
  This file is part of Aleph-w library
 
  Copyright (c) 2002-2026 Leandro Rabindranath Leon
 
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
 
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
 
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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  SOFTWARE.
*/
 
#ifndef COMPILER_MODULE_BINDER_H
#define COMPILER_MODULE_BINDER_H
 
#include <sstream>
#include <string>
 
#include <tpl_dynMapTree.H>
#include <Compiler_Module_Linker.H>
 
namespace Aleph {
struct Compiler_Module_Bound_Name
{
  Compiler_Module_Export_Kind kind = Compiler_Module_Export_Kind::Global;
  std::string name;
  size_t provider_module_index = static_cast<size_t>(-1);
  std::string provider_module_name;
  Source_Span declaration_span;
  bool imported = false;  
};
 
struct Compiler_Module_Bindings
{
  std::string module_name;
  size_t module_index = static_cast<size_t>(-1);
  size_t order_index = static_cast<size_t>(-1);
  DynArray<Compiler_Module_Bound_Name> names;
};
 
enum class Compiler_Module_Binding_Issue_Kind
{
  Missing_Metadata,
  Ambiguous_Value_Name,
  Ambiguous_Type_Name
};
 
struct Compiler_Module_Binding_Issue
{
  Compiler_Module_Binding_Issue_Kind kind = Compiler_Module_Binding_Issue_Kind::Missing_Metadata;
  size_t module_index = static_cast<size_t>(-1);
  std::string module_name;
  std::string symbol_name;
  std::string referenced_module_name;
  std::string first_provider_module;
  std::string second_provider_module;
  Source_Span span;
};
 
struct Compiler_Module_Binding_Result
{
  bool valid = true;
  DynArray<Compiler_Module_Bindings> modules;
  DynArray<Compiler_Module_Binding_Issue> issues;
};
 
inline const char *compiler_module_binding_issue_name(const Compiler_Module_Binding_Issue_Kind kind) noexcept
{
  switch (kind)
    {
    case Compiler_Module_Binding_Issue_Kind::Missing_Metadata:
      return "Missing_Metadata";
    case Compiler_Module_Binding_Issue_Kind::Ambiguous_Value_Name:
      return "Ambiguous_Value_Name";
    case Compiler_Module_Binding_Issue_Kind::Ambiguous_Type_Name:
      return "Ambiguous_Type_Name";
    }
 
  return "Unknown";
}
 
namespace Compiler_Module_Binder_Detail {
inline int export_namespace_bucket(const Compiler_Module_Export_Kind kind) noexcept
{
  return kind == Compiler_Module_Export_Kind::Type ? 1 : 0;
}
 
 
inline Compiler_Module_Binding_Issue translate_issue(const Compiler_Module_Linkage_Issue &issue)
{
  Compiler_Module_Binding_Issue translated;
  translated.module_index = issue.module_index;
  translated.module_name = issue.module_name;
  translated.span = issue.span;
 
  switch (issue.kind)
    {
    case Compiler_Module_Linkage_Issue_Kind::Missing_Metadata:
      translated.kind = Compiler_Module_Binding_Issue_Kind::Missing_Metadata;
      translated.referenced_module_name = issue.second_provider_module;
      break;
    case Compiler_Module_Linkage_Issue_Kind::Duplicate_Value_Export:
      translated.kind = Compiler_Module_Binding_Issue_Kind::Ambiguous_Value_Name;
      translated.symbol_name = issue.export_name;
      translated.first_provider_module = issue.first_provider_module;
      translated.second_provider_module = issue.second_provider_module;
      break;
    case Compiler_Module_Linkage_Issue_Kind::Duplicate_Type_Export:
      translated.kind = Compiler_Module_Binding_Issue_Kind::Ambiguous_Type_Name;
      translated.symbol_name = issue.export_name;
      translated.first_provider_module = issue.first_provider_module;
      translated.second_provider_module = issue.second_provider_module;
      break;
    }
 
  return translated;
}
}  // namespace Compiler_Module_Binder_Detail
 
inline Compiler_Module_Binding_Result compiler_bind_module_surfaces(
  const Compiler_Module_Link_Result &linkage)
{
  Compiler_Module_Binding_Result result;
  result.valid = linkage.valid;
 
  for (size_t i = 0; i < linkage.issues.size(); ++i)
    result.issues.append(Compiler_Module_Binder_Detail::translate_issue(linkage.issues.access(i)));
 
  for (size_t i = 0; i < linkage.modules.size(); ++i)
    {
      const auto &linked_module = linkage.modules.access(i);
      Compiler_Module_Bindings bindings;
      bindings.module_name = linked_module.module_name;
      bindings.module_index = linked_module.module_index;
      bindings.order_index = linked_module.order_index;
 
      // Precompute conflict set: keys with more than one distinct provider
      // in the same namespace bucket are ambiguous. O(N log N) single pass.
      DynMapTree<std::string, size_t> first_provider; // key -> source_module_index of first
      DynMapTree<std::string, bool> ambiguous_keys;
      for (size_t j = 0; j < linked_module.visible_exports.size(); ++j)
        {
          const auto &exp = linked_module.visible_exports.access(j);
          const std::string key =
            std::to_string(Compiler_Module_Binder_Detail::export_namespace_bucket(exp.kind))
            + ":" + exp.name;
          const auto *prev = first_provider.search(key);
          if (prev == nullptr)
            {
              first_provider[key] = exp.source_module_index;
            }
          else if (prev->second != exp.source_module_index)
            {
              ambiguous_keys[key] = true;
            }
        }
 
      // Binding pass: skip ambiguous names; deduplicate with a bound-names map.
      DynMapTree<std::string, bool> bound_keys;
      for (size_t j = 0; j < linked_module.visible_exports.size(); ++j)
        {
          const auto &item = linked_module.visible_exports.access(j);
          const std::string key =
            std::to_string(Compiler_Module_Binder_Detail::export_namespace_bucket(item.kind))
            + ":" + item.name;
          if (ambiguous_keys.search(key) != nullptr)
            continue;
          if (bound_keys.search(key) != nullptr)
            continue;
          bound_keys[key] = true;
          bindings.names.append({item.kind,
                                 item.name,
                                 item.source_module_index,
                                 item.source_module_name,
                                 item.declaration_span,
                                 item.imported});
        }
 
      result.modules.append(std::move(bindings));
    }
 
  return result;
}
 
inline std::string compiler_render_module_bindings(const Compiler_Module_Binding_Result &result)
{
  std::ostringstream out;
  out << "ModuleBindings\n";
  for (size_t i = 0; i < result.modules.size(); ++i)
    {
      const auto &module = result.modules.access(i);
      out << "  Module(" << module.module_name << ") order=" << module.order_index << '\n';
      for (size_t j = 0; j < module.names.size(); ++j)
        {
          const auto &item = module.names.access(j);
          out << "    Bind(" << compiler_module_export_kind_name(item.kind) << "(" << item.name
              << ")) -> " << item.provider_module_name << ' '
              << (item.imported ? "imported" : "local");
          if (item.declaration_span.is_valid())
            out << " @" << item.declaration_span.to_string();
          out << '\n';
        }
    }
 
  for (size_t i = 0; i < result.issues.size(); ++i)
    {
      const auto &issue = result.issues.access(i);
      out << "  Issue(" << compiler_module_binding_issue_name(issue.kind)
          << ") module=" << issue.module_name;
      if (not issue.symbol_name.empty())
        out << " name=" << issue.symbol_name;
      if (not issue.referenced_module_name.empty())
        out << " dependency=" << issue.referenced_module_name;
      if (not issue.first_provider_module.empty())
        out << " first=" << issue.first_provider_module;
      if (not issue.second_provider_module.empty())
        out << " second=" << issue.second_provider_module;
      if (issue.span.is_valid())
        out << " @" << issue.span.to_string();
      out << '\n';
    }
 
  return out.str();
}
}  // namespace Aleph
 
#endif