ClangPersistentVariables.h

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//===-- ClangPersistentVariables.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
//
//===----------------------------------------------------------------------===//
 
#ifndef LLDB_SOURCE_PLUGINS_EXPRESSIONPARSER_CLANG_CLANGPERSISTENTVARIABLES_H
#define LLDB_SOURCE_PLUGINS_EXPRESSIONPARSER_CLANG_CLANGPERSISTENTVARIABLES_H
 
#include "llvm/ADT/DenseMap.h"
 
#include "ClangExpressionVariable.h"
#include "ClangModulesDeclVendor.h"
 
#include "lldb/Expression/ExpressionVariable.h"
 
namespace lldb_private {
 
class ClangASTImporter;
class TypeSystemClang;
 
/// \class ClangPersistentVariables ClangPersistentVariables.h
/// "lldb/Expression/ClangPersistentVariables.h" Manages persistent values
/// that need to be preserved between expression invocations.
///
/// A list of variables that can be accessed and updated by any expression.  See
/// ClangPersistentVariable for more discussion.  Also provides an increasing,
/// 0-based counter for naming result variables.
class ClangPersistentVariables : public PersistentExpressionState {
public:
  ClangPersistentVariables();
 
  ~ClangPersistentVariables() override = default;
 
  // llvm casting support
  static bool classof(const PersistentExpressionState *pv) {
    return pv->getKind() == PersistentExpressionState::eKindClang;
  }
 
  std::shared_ptr<ClangASTImporter> GetClangASTImporter();
 
  lldb::ExpressionVariableSP
  CreatePersistentVariable(const lldb::ValueObjectSP &valobj_sp) override;
 
  lldb::ExpressionVariableSP CreatePersistentVariable(
      ExecutionContextScope *exe_scope, ConstString name,
      const CompilerType &compiler_type, lldb::ByteOrder byte_order,
      uint32_t addr_byte_size) override;
 
  void RemovePersistentVariable(lldb::ExpressionVariableSP variable) override;
 
  ConstString GetNextPersistentVariableName(bool is_error = false) override;
 
  /// Returns the next file name that should be used for user expressions.
  std::string GetNextExprFileName() {
    std::string name;
    name.append("<user expression ");
    name.append(std::to_string(m_next_user_file_id++));
    name.append(">");
    return name;
  }
 
  llvm::Optional<CompilerType>
  GetCompilerTypeFromPersistentDecl(ConstString type_name) override;
 
  void RegisterPersistentDecl(ConstString name, clang::NamedDecl *decl,
                              TypeSystemClang *ctx);
 
  clang::NamedDecl *GetPersistentDecl(ConstString name);
 
  void AddHandLoadedClangModule(ClangModulesDeclVendor::ModuleID module) {
    m_hand_loaded_clang_modules.push_back(module);
  }
 
  const ClangModulesDeclVendor::ModuleVector &GetHandLoadedClangModules() {
    return m_hand_loaded_clang_modules;
  }
 
protected:
  llvm::StringRef
  GetPersistentVariablePrefix(bool is_error = false) const override {
    return "$";
  }
 
private:
  /// The counter used by GetNextExprFileName.
  uint32_t m_next_user_file_id = 0;
  // The counter used by GetNextPersistentVariableName
  uint32_t m_next_persistent_variable_id = 0;
 
  struct PersistentDecl {
    /// The persistent decl.
    clang::NamedDecl *m_decl = nullptr;
    /// The TypeSystemClang for the ASTContext of m_decl.
    TypeSystemClang *m_context = nullptr;
  };
 
  typedef llvm::DenseMap<const char *, PersistentDecl> PersistentDeclMap;
  PersistentDeclMap
      m_persistent_decls; ///< Persistent entities declared by the user.
 
  ClangModulesDeclVendor::ModuleVector
      m_hand_loaded_clang_modules; ///< These are Clang modules we hand-loaded;
                                   ///these are the highest-
                                   ///< priority source for macros.
  std::shared_ptr<ClangASTImporter> m_ast_importer_sp;
};
 
} // namespace lldb_private
 
#endif // LLDB_SOURCE_PLUGINS_EXPRESSIONPARSER_CLANG_CLANGPERSISTENTVARIABLES_H