//===-- PlatformNetBSD.cpp ------------------------------------------------===//

//

// 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

//

//===----------------------------------------------------------------------===//

#include "PlatformNetBSD.h"

#include "lldb/Host/Config.h"

#include <cstdio>

#if LLDB_ENABLE_POSIX

#include <sys/utsname.h>

#endif

#include "lldb/Core/Debugger.h"

#include "lldb/Core/PluginManager.h"

#include "lldb/Host/HostInfo.h"

#include "lldb/Target/Process.h"

#include "lldb/Target/Target.h"

#include "lldb/Utility/FileSpec.h"

#include "lldb/Utility/LLDBLog.h"

#include "lldb/Utility/Log.h"

#include "lldb/Utility/State.h"

#include "lldb/Utility/Status.h"

#include "lldb/Utility/StreamString.h"

// Define these constants from NetBSD mman.h for use when targeting remote

// netbsd systems even when host has different values.

#define MAP_PRIVATE 0x0002

#define MAP_ANON 0x1000

using namespace lldb;

using namespace lldb_private;

using namespace lldb_private::platform_netbsd;

LLDB_PLUGIN_DEFINE(PlatformNetBSD)

static uint32_t g_initialize_count = 0;

PlatformSP PlatformNetBSD::CreateInstance(bool force, const ArchSpec *arch) {

  Log *log = GetLog(LLDBLog::Platform);

  LLDB_LOG(log, "force = {0}, arch=({1}, {2})", force,

           arch ? arch->GetArchitectureName() : "<null>",

           arch ? arch->GetTriple().getTriple() : "<null>");

  bool create = force;

  if (!create && 
arch204
 && 
arch->IsValid()204
) {

    const llvm::Triple &triple = arch->GetTriple();

    switch (triple.getOS()) {

    case llvm::Triple::NetBSD:

      create = true;

      break;

    default:

      break;

    }

  }

  LLDB_LOG(log, "create = {0}", create);

  if (create) {

    return PlatformSP(new PlatformNetBSD(false));

  }

  return PlatformSP();

}

llvm::StringRef PlatformNetBSD::GetPluginDescriptionStatic(bool is_host) {

  if (is_host)

    return "Local NetBSD user platform plug-in.";

  return "Remote NetBSD user platform plug-in.";

}

void PlatformNetBSD::Initialize() {

  PlatformPOSIX::Initialize();

  if (g_initialize_count++ == 0) {

#if defined(__NetBSD__)

    PlatformSP default_platform_sp(new PlatformNetBSD(true));

    default_platform_sp->SetSystemArchitecture(HostInfo::GetArchitecture());

    Platform::SetHostPlatform(default_platform_sp);

#endif

    PluginManager::RegisterPlugin(

        PlatformNetBSD::GetPluginNameStatic(false),

        PlatformNetBSD::GetPluginDescriptionStatic(false),

        PlatformNetBSD::CreateInstance, nullptr);

  }

}

void PlatformNetBSD::Terminate() {

  if (g_initialize_count > 0) {

    if (--g_initialize_count == 0) {

      PluginManager::UnregisterPlugin(PlatformNetBSD::CreateInstance);

    }

  }

  PlatformPOSIX::Terminate();

}

/// Default Constructor

PlatformNetBSD::PlatformNetBSD(bool is_host)

    : PlatformPOSIX(is_host) // This is the local host platform

{

  if (is_host) {

    ArchSpec hostArch = HostInfo::GetArchitecture(HostInfo::eArchKindDefault);

    m_supported_architectures.push_back(hostArch);

    if (hostArch.GetTriple().isArch64Bit()) {

      m_supported_architectures.push_back(

          HostInfo::GetArchitecture(HostInfo::eArchKind32));

    }

  } else {

    m_supported_architectures = CreateArchList(

        {llvm::Triple::x86_64, llvm::Triple::x86}, llvm::Triple::NetBSD);

  }

}

std::vector<ArchSpec>

PlatformNetBSD::GetSupportedArchitectures(const ArchSpec &process_host_arch) {

  if (m_remote_platform_sp)

    return m_remote_platform_sp->GetSupportedArchitectures(process_host_arch);

  return m_supported_architectures;

}

void PlatformNetBSD::GetStatus(Stream &strm) {

  Platform::GetStatus(strm);

#if LLDB_ENABLE_POSIX

  // Display local kernel information only when we are running in host mode.

  // Otherwise, we would end up printing non-NetBSD information (when running

  // on Mac OS for example).

  if (IsHost()) {

    struct utsname un;

    if (uname(&un))

      return;

    strm.Printf("    Kernel: %s\n", un.sysname);

    strm.Printf("   Release: %s\n", un.release);

    strm.Printf("   Version: %s\n", un.version);

  }

#endif

}

uint32_t

PlatformNetBSD::GetResumeCountForLaunchInfo(ProcessLaunchInfo &launch_info) {

  uint32_t resume_count = 0;

  // Always resume past the initial stop when we use eLaunchFlagDebug

  if (launch_info.GetFlags().Test(eLaunchFlagDebug)) {

    // Resume past the stop for the final exec into the true inferior.

    ++resume_count;

  }

  // If we're not launching a shell, we're done.

  const FileSpec &shell = launch_info.GetShell();

  if (!shell)

    return resume_count;

  std::string shell_string = shell.GetPath();

  // We're in a shell, so for sure we have to resume past the shell exec.

  ++resume_count;

  // Figure out what shell we're planning on using.

  const char *shell_name = strrchr(shell_string.c_str(), '/');

  if (shell_name == nullptr)

    shell_name = shell_string.c_str();

  else

    shell_name++;

  if (strcmp(shell_name, "csh") == 0 || strcmp(shell_name, "tcsh") == 0 ||

      strcmp(shell_name, "zsh") == 0 || strcmp(shell_name, "sh") == 0) {

    // These shells seem to re-exec themselves.  Add another resume.

    ++resume_count;

  }

  return resume_count;

}

bool PlatformNetBSD::CanDebugProcess() {

  if (IsHost()) {

    return true;

  } else {

    // If we're connected, we can debug.

    return IsConnected();

  }

}

void PlatformNetBSD::CalculateTrapHandlerSymbolNames() {

  m_trap_handlers.push_back(ConstString("_sigtramp"));

}

MmapArgList PlatformNetBSD::GetMmapArgumentList(const ArchSpec &arch,

                                                addr_t addr, addr_t length,

                                                unsigned prot, unsigned flags,

                                                addr_t fd, addr_t offset) {

  uint64_t flags_platform = 0;

  if (flags & eMmapFlagsPrivate)

    flags_platform |= MAP_PRIVATE;

  if (flags & eMmapFlagsAnon)

    flags_platform |= MAP_ANON;

  MmapArgList args({addr, length, prot, flags_platform, fd, offset});

  return args;

}

CompilerType PlatformNetBSD::GetSiginfoType(const llvm::Triple &triple) {

  {

    std::lock_guard<std::mutex> guard(m_mutex);

    if (!m_type_system)

      m_type_system = std::make_shared<TypeSystemClang>("siginfo", triple);

  }

  TypeSystemClang *ast = m_type_system.get();

  // generic types

  CompilerType int_type = ast->GetBasicType(eBasicTypeInt);

  CompilerType uint_type = ast->GetBasicType(eBasicTypeUnsignedInt);

  CompilerType long_type = ast->GetBasicType(eBasicTypeLong);

  CompilerType long_long_type = ast->GetBasicType(eBasicTypeLongLong);

  CompilerType voidp_type = ast->GetBasicType(eBasicTypeVoid).GetPointerType();

  // platform-specific types

  CompilerType &pid_type = int_type;

  CompilerType &uid_type = uint_type;

  CompilerType &clock_type = uint_type;

  CompilerType &lwpid_type = int_type;

  CompilerType sigval_type = ast->CreateRecordType(

      nullptr, OptionalClangModuleID(), lldb::eAccessPublic, "__lldb_sigval_t",

      clang::TTK_Union, lldb::eLanguageTypeC);

  ast->StartTagDeclarationDefinition(sigval_type);

  ast->AddFieldToRecordType(sigval_type, "sival_int", int_type,

                            lldb::eAccessPublic, 0);

  ast->AddFieldToRecordType(sigval_type, "sival_ptr", voidp_type,

                            lldb::eAccessPublic, 0);

  ast->CompleteTagDeclarationDefinition(sigval_type);

  CompilerType ptrace_option_type = ast->CreateRecordType(

      nullptr, OptionalClangModuleID(), lldb::eAccessPublic, "",

      clang::TTK_Union, lldb::eLanguageTypeC);

  ast->StartTagDeclarationDefinition(ptrace_option_type);

  ast->AddFieldToRecordType(ptrace_option_type, "_pe_other_pid", pid_type,

                            lldb::eAccessPublic, 0);

  ast->AddFieldToRecordType(ptrace_option_type, "_pe_lwp", lwpid_type,

                            lldb::eAccessPublic, 0);

  ast->CompleteTagDeclarationDefinition(ptrace_option_type);

  // siginfo_t

  CompilerType siginfo_type = ast->CreateRecordType(

      nullptr, OptionalClangModuleID(), lldb::eAccessPublic, "__lldb_siginfo_t",

      clang::TTK_Union, lldb::eLanguageTypeC);

  ast->StartTagDeclarationDefinition(siginfo_type);

  // struct _ksiginfo

  CompilerType ksiginfo_type = ast->CreateRecordType(

      nullptr, OptionalClangModuleID(), lldb::eAccessPublic, "",

      clang::TTK_Struct, lldb::eLanguageTypeC);

  ast->StartTagDeclarationDefinition(ksiginfo_type);

  ast->AddFieldToRecordType(ksiginfo_type, "_signo", int_type,

                            lldb::eAccessPublic, 0);

  ast->AddFieldToRecordType(ksiginfo_type, "_code", int_type,

                            lldb::eAccessPublic, 0);

  ast->AddFieldToRecordType(ksiginfo_type, "_errno", int_type,

                            lldb::eAccessPublic, 0);

  // the structure is padded on 64-bit arches to fix alignment

  if (triple.isArch64Bit())

    ast->AddFieldToRecordType(ksiginfo_type, "__pad0", int_type,

                              lldb::eAccessPublic, 0);

  // union used to hold the signal data

  CompilerType union_type = ast->CreateRecordType(

      nullptr, OptionalClangModuleID(), lldb::eAccessPublic, "",

      clang::TTK_Union, lldb::eLanguageTypeC);

  ast->StartTagDeclarationDefinition(union_type);

  ast->AddFieldToRecordType(

      union_type, "_rt",

      ast->CreateStructForIdentifier(llvm::StringRef(),

                                     {

                                         {"_pid", pid_type},

                                         {"_uid", uid_type},

                                         {"_value", sigval_type},

                                     }),

      lldb::eAccessPublic, 0);

  ast->AddFieldToRecordType(

      union_type, "_child",

      ast->CreateStructForIdentifier(llvm::StringRef(),

                                     {

                                         {"_pid", pid_type},

                                         {"_uid", uid_type},

                                         {"_status", int_type},

                                         {"_utime", clock_type},

                                         {"_stime", clock_type},

                                     }),

      lldb::eAccessPublic, 0);

  ast->AddFieldToRecordType(

      union_type, "_fault",

      ast->CreateStructForIdentifier(llvm::StringRef(),

                                     {

                                         {"_addr", voidp_type},

                                         {"_trap", int_type},

                                         {"_trap2", int_type},

                                         {"_trap3", int_type},

                                     }),

      lldb::eAccessPublic, 0);

  ast->AddFieldToRecordType(

      union_type, "_poll",

      ast->CreateStructForIdentifier(llvm::StringRef(),

                                     {

                                         {"_band", long_type},

                                         {"_fd", int_type},

                                     }),

      lldb::eAccessPublic, 0);

  ast->AddFieldToRecordType(union_type, "_syscall",

                            ast->CreateStructForIdentifier(

                                llvm::StringRef(),

                                {

                                    {"_sysnum", int_type},

                                    {"_retval", int_type.GetArrayType(2)},

                                    {"_error", int_type},

                                    {"_args", long_long_type.GetArrayType(8)},

                                }),

                            lldb::eAccessPublic, 0);

  ast->AddFieldToRecordType(

      union_type, "_ptrace_state",

      ast->CreateStructForIdentifier(llvm::StringRef(),

                                     {

                                         {"_pe_report_event", int_type},

                                         {"_option", ptrace_option_type},

                                     }),

      lldb::eAccessPublic, 0);

  ast->CompleteTagDeclarationDefinition(union_type);

  ast->AddFieldToRecordType(ksiginfo_type, "_reason", union_type,

                            lldb::eAccessPublic, 0);

  ast->CompleteTagDeclarationDefinition(ksiginfo_type);

  ast->AddFieldToRecordType(siginfo_type, "_info", ksiginfo_type,

                            lldb::eAccessPublic, 0);

  ast->CompleteTagDeclarationDefinition(siginfo_type);

  return siginfo_type;

}