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

#include "RustUserExpression.h"
#include "lldb/Core/ValueObject.h"
#include "lldb/Expression/DiagnosticManager.h"
#include "lldb/Expression/ExpressionVariable.h"
#include "lldb/Symbol/RustASTContext.h"
#include "lldb/Target/Target.h"
#include "Plugins/ExpressionParser/Rust/RustParse.h"

using namespace lldb_private::rust;
using namespace lldb_private;
using namespace lldb;

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

  Parser parser(exe_ctx.GetTargetSP(), m_expr_text);
  Status status;
  m_expr = parser.ParseFully(status);
  if (!m_expr) {
    diagnostic_manager.PutString(eDiagnosticSeverityError, status.AsCString());
    return false;
  }

  return true;
}

lldb::ExpressionResults RustUserExpression::DoExecute(DiagnosticManager &diagnostic_manager,
						      ExecutionContext &exe_ctx,
						      const EvaluateExpressionOptions &options,
						      lldb::UserExpressionSP &shared_ptr_to_me,
						      lldb::ExpressionVariableSP &result)
{
  Status error;
  ValueObjectSP value = m_expr->Evaluate(exe_ctx, error);
  m_expr.reset();

  if (!value) {
    diagnostic_manager.PutString(eDiagnosticSeverityError, error.AsCString());
    return lldb::eExpressionDiscarded;
  }

  result.reset(new ExpressionVariable(ExpressionVariable::eKindRust));
  result->m_live_sp = result->m_frozen_sp = value;
  result->m_flags |= ExpressionVariable::EVIsProgramReference;
  Target *target = exe_ctx.GetTargetPtr();
  PersistentExpressionState *pv =
      target->GetPersistentExpressionStateForLanguage(eLanguageTypeRust);
  if (pv != nullptr) {
    result->SetName(pv->GetNextPersistentVariableName(*target,
						      pv->GetPersistentVariablePrefix()));
    pv->AddVariable(result);
  }

  return lldb::eExpressionCompleted;
}