xref: /freebsd-11-stable/contrib/llvm-project/lldb/source/Plugins/ExpressionParser/Clang/ClangPersistentVariables.cpp

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

#include "ClangPersistentVariables.h"

#include "lldb/Core/DataExtractor.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Core/Value.h"

#include "clang/AST/Decl.h"

#include "llvm/ADT/StringMap.h"

using namespace lldb;
using namespace lldb_private;

ClangPersistentVariables::ClangPersistentVariables()
    : lldb_private::PersistentExpressionState(LLVMCastKind::eKindClang),
      m_next_persistent_variable_id(0) {}

ExpressionVariableSP ClangPersistentVariables::CreatePersistentVariable(
    const lldb::ValueObjectSP &valobj_sp) {
  return AddNewlyConstructedVariable(new ClangExpressionVariable(valobj_sp));
}

ExpressionVariableSP ClangPersistentVariables::CreatePersistentVariable(
    ExecutionContextScope *exe_scope, const ConstString &name,
    const CompilerType &compiler_type, lldb::ByteOrder byte_order,
    uint32_t addr_byte_size) {
  return AddNewlyConstructedVariable(new ClangExpressionVariable(
      exe_scope, name, compiler_type, byte_order, addr_byte_size));
}

void ClangPersistentVariables::RemovePersistentVariable(
    lldb::ExpressionVariableSP variable) {
  RemoveVariable(variable);

  const char *name = variable->GetName().AsCString();

  if (*name != '$')
    return;
  name++;

  if (strtoul(name, NULL, 0) == m_next_persistent_variable_id - 1)
    m_next_persistent_variable_id--;
}

ConstString ClangPersistentVariables::GetNextPersistentVariableName() {
  char name_cstr[256];
  ::snprintf(name_cstr, sizeof(name_cstr), "$%u",
             m_next_persistent_variable_id++);
  ConstString name(name_cstr);
  return name;
}

void ClangPersistentVariables::RegisterPersistentDecl(const ConstString &name,
                                                      clang::NamedDecl *decl) {
  m_persistent_decls.insert(
      std::pair<const char *, clang::NamedDecl *>(name.GetCString(), decl));

  if (clang::EnumDecl *enum_decl = llvm::dyn_cast<clang::EnumDecl>(decl)) {
    for (clang::EnumConstantDecl *enumerator_decl : enum_decl->enumerators()) {
      m_persistent_decls.insert(std::pair<const char *, clang::NamedDecl *>(
          ConstString(enumerator_decl->getNameAsString()).GetCString(),
          enumerator_decl));
    }
  }
}

clang::NamedDecl *
ClangPersistentVariables::GetPersistentDecl(const ConstString &name) {
  PersistentDeclMap::const_iterator i =
      m_persistent_decls.find(name.GetCString());

  if (i == m_persistent_decls.end())
    return NULL;
  else
    return i->second;
}