lldb/source/Plugins/ExpressionParser/Go/GoUserExpression.h

//===-- GoUserExpression.h --------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef liblldb_GoUserExpression_h_
#define liblldb_GoUserExpression_h_

// C Includes
// C++ Includes
#include <memory>

// Other libraries and framework includes
// Project includes
#include "lldb/Expression/ExpressionVariable.h"
#include "lldb/Expression/UserExpression.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/lldb-forward.h"
#include "lldb/lldb-private.h"

namespace lldb_private {
class GoParser;

class GoPersistentExpressionState : public PersistentExpressionState {
public:
  GoPersistentExpressionState();

  ConstString GetNextPersistentVariableName(Target &target) override;

  void RemovePersistentVariable(lldb::ExpressionVariableSP variable) override;

  lldb::addr_t LookupSymbol(const ConstString &name) override {
    return LLDB_INVALID_ADDRESS;
  }

  static bool classof(const PersistentExpressionState *pv) {
    return pv->getKind() == PersistentExpressionState::eKindGo;
  }

private:
  uint32_t m_next_persistent_variable_id; ///< The counter used by
                                          ///GetNextResultName().
};

//----------------------------------------------------------------------
/// @class GoUserExpression GoUserExpression.h
/// "lldb/Expression/GoUserExpression.h"
/// @brief Encapsulates a single expression for use with Go
///
/// LLDB uses expressions for various purposes, notably to call functions
/// and as a backend for the expr command.  GoUserExpression encapsulates
/// the objects needed to parse and interpret an expression.
//----------------------------------------------------------------------
class GoUserExpression : public UserExpression {
public:
  GoUserExpression(ExecutionContextScope &exe_scope, llvm::StringRef expr,
                   llvm::StringRef prefix, lldb::LanguageType language,
                   ResultType desired_type,
                   const EvaluateExpressionOptions &options);

  bool Parse(DiagnosticManager &diagnostic_manager, ExecutionContext &exe_ctx,
             lldb_private::ExecutionPolicy execution_policy,
             bool keep_result_in_memory, bool generate_debug_info) override;

  bool CanInterpret() override { return true; }
  bool FinalizeJITExecution(
      DiagnosticManager &diagnostic_manager, ExecutionContext &exe_ctx,
      lldb::ExpressionVariableSP &result,
      lldb::addr_t function_stack_bottom = LLDB_INVALID_ADDRESS,
      lldb::addr_t function_stack_top = LLDB_INVALID_ADDRESS) override {
    return true;
  }

protected:
  lldb::ExpressionResults
  DoExecute(DiagnosticManager &diagnostic_manager, ExecutionContext &exe_ctx,
            const EvaluateExpressionOptions &options,
            lldb::UserExpressionSP &shared_ptr_to_me,
            lldb::ExpressionVariableSP &result) override;

private:
  class GoInterpreter;
  std::unique_ptr<GoInterpreter> m_interpreter;
};

} // namespace lldb_private

#endif // liblldb_GoUserExpression_h_