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llvm-project/lldb/source/API/SBTarget.cpp
Greg Clayton 8b82f087a0 Moved the execution context that was in the Debugger into 
the CommandInterpreter where it was always being used.

Make sure that Modules can track their object file offsets correctly to
allow opening of sub object files (like the "__commpage" on darwin).

Modified the Platforms to be able to launch processes. The first part of this
move is the platform soon will become the entity that launches your program
and when it does, it uses a new ProcessLaunchInfo class which encapsulates
all process launching settings. This simplifies the internal APIs needed for
launching. I want to slowly phase out process launching from the process
classes, so for now we can still launch just as we used to, but eventually
the platform is the object that should do the launching.

Modified the Host::LaunchProcess in the MacOSX Host.mm to correctly be able
to launch processes with all of the new eLaunchFlag settings. Modified any
code that was manually launching processes to use the Host::LaunchProcess
functions.

Fixed an issue where lldb_private::Args had implicitly defined copy 
constructors that could do the wrong thing. This has now been fixed by adding
an appropriate copy constructor and assignment operator.

Make sure we don't add empty ModuleSP entries to a module list.

Fixed the commpage module creation on MacOSX, but we still need to train
the MacOSX dynamic loader to not get rid of it when it doesn't have an entry
in the all image infos.

Abstracted many more calls from in ProcessGDBRemote down into the 
GDBRemoteCommunicationClient subclass to make the classes cleaner and more
efficient.

Fixed the default iOS ARM register context to be correct and also added support
for targets that don't support the qThreadStopInfo packet by selecting the
current thread (only if needed) and then sending a stop reply packet.

Debugserver can now start up with a --unix-socket (-u for short) and can 
then bind to port zero and send the port it bound to to a listening process
on the other end. This allows the GDB remote platform to spawn new GDB server
instances (debugserver) to allow platform debugging.

llvm-svn: 129351
2011-04-12 05:54:46 +00:00

841 lines
23 KiB
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//===-- SBTarget.cpp --------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/API/SBTarget.h"
#include "lldb/lldb-public.h"
#include "lldb/API/SBFileSpec.h"
#include "lldb/API/SBModule.h"
#include "lldb/API/SBStream.h"
#include "lldb/Breakpoint/BreakpointID.h"
#include "lldb/Breakpoint/BreakpointIDList.h"
#include "lldb/Breakpoint/BreakpointList.h"
#include "lldb/Breakpoint/BreakpointLocation.h"
#include "lldb/Core/Address.h"
#include "lldb/Core/AddressResolver.h"
#include "lldb/Core/AddressResolverName.h"
#include "lldb/Interpreter/Args.h"
#include "lldb/Core/ArchSpec.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Disassembler.h"
#include "lldb/Host/FileSpec.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/RegularExpression.h"
#include "lldb/Core/SearchFilter.h"
#include "lldb/Core/STLUtils.h"
#include "lldb/Host/Host.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/TargetList.h"
#include "lldb/Interpreter/CommandReturnObject.h"
#include "../source/Commands/CommandObjectBreakpoint.h"
#include "lldb/API/SBDebugger.h"
#include "lldb/API/SBProcess.h"
#include "lldb/API/SBListener.h"
#include "lldb/API/SBBreakpoint.h"
using namespace lldb;
using namespace lldb_private;
#define DEFAULT_DISASM_BYTE_SIZE 32
//----------------------------------------------------------------------
// SBTarget constructor
//----------------------------------------------------------------------
SBTarget::SBTarget () :
m_opaque_sp ()
{
}
SBTarget::SBTarget (const SBTarget& rhs) :
m_opaque_sp (rhs.m_opaque_sp)
{
}
SBTarget::SBTarget(const TargetSP& target_sp) :
m_opaque_sp (target_sp)
{
}
const SBTarget&
SBTarget::operator = (const SBTarget& rhs)
{
if (this != &rhs)
m_opaque_sp = rhs.m_opaque_sp;
return *this;
}
//----------------------------------------------------------------------
// Destructor
//----------------------------------------------------------------------
SBTarget::~SBTarget()
{
}
bool
SBTarget::IsValid () const
{
return m_opaque_sp.get() != NULL;
}
SBProcess
SBTarget::GetProcess ()
{
SBProcess sb_process;
if (m_opaque_sp)
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
sb_process.SetProcess (m_opaque_sp->GetProcessSP());
}
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
if (log)
{
log->Printf ("SBTarget(%p)::GetProcess () => SBProcess(%p)",
m_opaque_sp.get(), sb_process.get());
}
return sb_process;
}
SBDebugger
SBTarget::GetDebugger () const
{
SBDebugger debugger;
if (m_opaque_sp)
debugger.reset (m_opaque_sp->GetDebugger().GetSP());
return debugger;
}
SBProcess
SBTarget::LaunchSimple
(
char const **argv,
char const **envp,
const char *working_directory
)
{
char *stdin_path = NULL;
char *stdout_path = NULL;
char *stderr_path = NULL;
uint32_t launch_flags = 0;
bool stop_at_entry = false;
SBError error;
SBListener listener = GetDebugger().GetListener();
return Launch (listener,
argv,
envp,
stdin_path,
stdout_path,
stderr_path,
working_directory,
launch_flags,
stop_at_entry,
error);
}
SBProcess
SBTarget::Launch
(
SBListener &listener,
char const **argv,
char const **envp,
const char *stdin_path,
const char *stdout_path,
const char *stderr_path,
const char *working_directory,
uint32_t launch_flags, // See LaunchFlags
bool stop_at_entry,
lldb::SBError& error
)
{
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
if (log)
{
log->Printf ("SBTarget(%p)::Launch (argv=%p, envp=%p, stdin=%s, stdout=%s, stderr=%s, working-dir=%s, launch_flags=0x%x, stop_at_entry=%i, &error (%p))...",
m_opaque_sp.get(),
argv,
envp,
stdin_path ? stdin_path : "NULL",
stdout_path ? stdout_path : "NULL",
stderr_path ? stderr_path : "NULL",
working_directory ? working_directory : "NULL",
launch_flags,
stop_at_entry,
error.get());
}
SBProcess sb_process;
if (m_opaque_sp)
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
if (getenv("LLDB_LAUNCH_FLAG_DISABLE_ASLR"))
launch_flags |= eLaunchFlagDisableASLR;
static const char *g_launch_tty = NULL;
static bool g_got_launch_tty = false;
if (!g_got_launch_tty)
{
// Get the LLDB_LAUNCH_FLAG_LAUNCH_IN_TTY only once
g_got_launch_tty = true;
g_launch_tty = ::getenv ("LLDB_LAUNCH_FLAG_LAUNCH_IN_TTY");
if (g_launch_tty)
{
// LLDB_LAUNCH_FLAG_LAUNCH_IN_TTY is a path to a terminal to reuse
// if the first character is '/', else it is a boolean value.
if (g_launch_tty[0] != '/')
{
if (Args::StringToBoolean(g_launch_tty, false, NULL))
g_launch_tty = "";
else
g_launch_tty = NULL;
}
}
}
// if ((launch_flags & eLaunchFlagLaunchInTTY) || g_launch_tty)
// {
// ArchSpec arch (m_opaque_sp->GetArchitecture ());
//
// Module *exe_module = m_opaque_sp->GetExecutableModule().get();
// if (exe_module)
// {
// char exec_file_path[PATH_MAX];
// exe_module->GetFileSpec().GetPath(exec_file_path, sizeof(exec_file_path));
// if (exe_module->GetFileSpec().Exists())
// {
// // Make a new argument vector
// std::vector<const char *> exec_path_plus_argv;
// // Append the resolved executable path
// exec_path_plus_argv.push_back (exec_file_path);
//
// // Push all args if there are any
// if (argv)
// {
// for (int i = 0; argv[i]; ++i)
// exec_path_plus_argv.push_back(argv[i]);
// }
//
// // Push a NULL to terminate the args.
// exec_path_plus_argv.push_back(NULL);
//
//
// const char *tty_name = NULL;
// if (g_launch_tty && g_launch_tty[0] == '/')
// tty_name = g_launch_tty;
//
// lldb::pid_t pid = Host::LaunchInNewTerminal (tty_name,
// &exec_path_plus_argv[0],
// envp,
// working_directory,
// &arch,
// true,
// launch_flags & eLaunchFlagDisableASLR);
//
// if (pid != LLDB_INVALID_PROCESS_ID)
// {
// sb_process = AttachToProcessWithID(listener, pid, error);
// }
// else
// {
// error.SetErrorStringWithFormat("failed to launch process in terminal");
// }
// }
// else
// {
// error.SetErrorStringWithFormat("executable doesn't exist: \"%s\"", exec_file_path);
// }
// }
// else
// {
// error.SetErrorStringWithFormat("invalid executable");
// }
// }
// else
{
if (listener.IsValid())
sb_process.SetProcess (m_opaque_sp->CreateProcess (listener.ref()));
else
sb_process.SetProcess (m_opaque_sp->CreateProcess (m_opaque_sp->GetDebugger().GetListener()));
if (sb_process.IsValid())
{
if (getenv("LLDB_LAUNCH_FLAG_DISABLE_STDIO"))
launch_flags |= eLaunchFlagDisableSTDIO;
error.SetError (sb_process->Launch (argv, envp, launch_flags, stdin_path, stdout_path, stderr_path, working_directory));
if (error.Success())
{
// We we are stopping at the entry point, we can return now!
if (stop_at_entry)
return sb_process;
// Make sure we are stopped at the entry
StateType state = sb_process->WaitForProcessToStop (NULL);
if (state == eStateStopped)
{
// resume the process to skip the entry point
error.SetError (sb_process->Resume());
if (error.Success())
{
// If we are doing synchronous mode, then wait for the
// process to stop yet again!
if (m_opaque_sp->GetDebugger().GetAsyncExecution () == false)
sb_process->WaitForProcessToStop (NULL);
}
}
}
}
else
{
error.SetErrorString ("unable to create lldb_private::Process");
}
}
}
else
{
error.SetErrorString ("SBTarget is invalid");
}
log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API);
if (log)
{
log->Printf ("SBTarget(%p)::Launch (...) => SBProceess(%p)",
m_opaque_sp.get(), sb_process.get());
}
return sb_process;
}
lldb::SBProcess
SBTarget::AttachToProcessWithID
(
SBListener &listener,
lldb::pid_t pid,// The process ID to attach to
SBError& error // An error explaining what went wrong if attach fails
)
{
SBProcess sb_process;
if (m_opaque_sp)
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
if (listener.IsValid())
sb_process.SetProcess (m_opaque_sp->CreateProcess (listener.ref()));
else
sb_process.SetProcess (m_opaque_sp->CreateProcess (m_opaque_sp->GetDebugger().GetListener()));
if (sb_process.IsValid())
{
error.SetError (sb_process->Attach (pid));
}
else
{
error.SetErrorString ("unable to create lldb_private::Process");
}
}
else
{
error.SetErrorString ("SBTarget is invalid");
}
return sb_process;
}
lldb::SBProcess
SBTarget::AttachToProcessWithName
(
SBListener &listener,
const char *name, // basename of process to attach to
bool wait_for, // if true wait for a new instance of "name" to be launched
SBError& error // An error explaining what went wrong if attach fails
)
{
SBProcess sb_process;
if (m_opaque_sp)
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
if (listener.IsValid())
sb_process.SetProcess (m_opaque_sp->CreateProcess (listener.ref()));
else
sb_process.SetProcess (m_opaque_sp->CreateProcess (m_opaque_sp->GetDebugger().GetListener()));
if (sb_process.IsValid())
{
error.SetError (sb_process->Attach (name, wait_for));
}
else
{
error.SetErrorString ("unable to create lldb_private::Process");
}
}
else
{
error.SetErrorString ("SBTarget is invalid");
}
return sb_process;
}
lldb::SBProcess
SBTarget::ConnectRemote
(
SBListener &listener,
const char *url,
const char *plugin_name,
SBError& error
)
{
SBProcess sb_process;
if (m_opaque_sp)
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
if (listener.IsValid())
sb_process.SetProcess (m_opaque_sp->CreateProcess (listener.ref(), plugin_name));
else
sb_process.SetProcess (m_opaque_sp->CreateProcess (m_opaque_sp->GetDebugger().GetListener(), plugin_name));
if (sb_process.IsValid())
{
error.SetError (sb_process->ConnectRemote (url));
}
else
{
error.SetErrorString ("unable to create lldb_private::Process");
}
}
else
{
error.SetErrorString ("SBTarget is invalid");
}
return sb_process;
}
SBFileSpec
SBTarget::GetExecutable ()
{
SBFileSpec exe_file_spec;
if (m_opaque_sp)
{
ModuleSP exe_module_sp (m_opaque_sp->GetExecutableModule ());
if (exe_module_sp)
exe_file_spec.SetFileSpec (exe_module_sp->GetFileSpec());
}
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
if (log)
{
log->Printf ("SBTarget(%p)::GetExecutable () => SBFileSpec(%p)",
m_opaque_sp.get(), exe_file_spec.get());
}
return exe_file_spec;
}
bool
SBTarget::DeleteTargetFromList (TargetList *list)
{
if (m_opaque_sp)
return list->DeleteTarget (m_opaque_sp);
else
return false;
}
bool
SBTarget::operator == (const SBTarget &rhs) const
{
return m_opaque_sp.get() == rhs.m_opaque_sp.get();
}
bool
SBTarget::operator != (const SBTarget &rhs) const
{
return m_opaque_sp.get() != rhs.m_opaque_sp.get();
}
lldb_private::Target *
SBTarget::operator ->() const
{
return m_opaque_sp.get();
}
lldb_private::Target *
SBTarget::get() const
{
return m_opaque_sp.get();
}
void
SBTarget::reset (const lldb::TargetSP& target_sp)
{
m_opaque_sp = target_sp;
}
bool
SBTarget::ResolveLoadAddress (lldb::addr_t vm_addr,
lldb::SBAddress& addr)
{
if (m_opaque_sp)
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
return m_opaque_sp->GetSectionLoadList().ResolveLoadAddress (vm_addr, *addr);
}
addr->Clear();
return false;
}
SBSymbolContext
SBTarget::ResolveSymbolContextForAddress (const SBAddress& addr, uint32_t resolve_scope)
{
SBSymbolContext sc;
if (m_opaque_sp)
m_opaque_sp->GetImages().ResolveSymbolContextForAddress (*addr, resolve_scope, sc.ref());
return sc;
}
SBBreakpoint
SBTarget::BreakpointCreateByLocation (const char *file, uint32_t line)
{
return SBBreakpoint(BreakpointCreateByLocation (SBFileSpec (file, false), line));
}
SBBreakpoint
SBTarget::BreakpointCreateByLocation (const SBFileSpec &sb_file_spec, uint32_t line)
{
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
SBBreakpoint sb_bp;
if (m_opaque_sp.get() && line != 0)
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
*sb_bp = m_opaque_sp->CreateBreakpoint (NULL, *sb_file_spec, line, true, false);
}
if (log)
{
SBStream sstr;
sb_bp.GetDescription (sstr);
char path[PATH_MAX];
sb_file_spec->GetPath (path, sizeof(path));
log->Printf ("SBTarget(%p)::BreakpointCreateByLocation ( %s:%u ) => SBBreakpoint(%p): %s",
m_opaque_sp.get(),
path,
line,
sb_bp.get(),
sstr.GetData());
}
return sb_bp;
}
SBBreakpoint
SBTarget::BreakpointCreateByName (const char *symbol_name, const char *module_name)
{
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
SBBreakpoint sb_bp;
if (m_opaque_sp.get() && symbol_name && symbol_name[0])
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
if (module_name && module_name[0])
{
FileSpec module_file_spec(module_name, false);
*sb_bp = m_opaque_sp->CreateBreakpoint (&module_file_spec, symbol_name, eFunctionNameTypeFull | eFunctionNameTypeBase, false);
}
else
{
*sb_bp = m_opaque_sp->CreateBreakpoint (NULL, symbol_name, eFunctionNameTypeFull | eFunctionNameTypeBase, false);
}
}
if (log)
{
log->Printf ("SBTarget(%p)::BreakpointCreateByName (symbol=\"%s\", module=\"%s\") => SBBreakpoint(%p)",
m_opaque_sp.get(), symbol_name, module_name, sb_bp.get());
}
return sb_bp;
}
SBBreakpoint
SBTarget::BreakpointCreateByRegex (const char *symbol_name_regex, const char *module_name)
{
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
SBBreakpoint sb_bp;
if (m_opaque_sp.get() && symbol_name_regex && symbol_name_regex[0])
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
RegularExpression regexp(symbol_name_regex);
if (module_name && module_name[0])
{
FileSpec module_file_spec(module_name, false);
*sb_bp = m_opaque_sp->CreateBreakpoint (&module_file_spec, regexp, false);
}
else
{
*sb_bp = m_opaque_sp->CreateBreakpoint (NULL, regexp, false);
}
}
if (log)
{
log->Printf ("SBTarget(%p)::BreakpointCreateByRegex (symbol_regex=\"%s\", module_name=\"%s\") => SBBreakpoint(%p)",
m_opaque_sp.get(), symbol_name_regex, module_name, sb_bp.get());
}
return sb_bp;
}
SBBreakpoint
SBTarget::BreakpointCreateByAddress (addr_t address)
{
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
SBBreakpoint sb_bp;
if (m_opaque_sp.get())
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
*sb_bp = m_opaque_sp->CreateBreakpoint (address, false);
}
if (log)
{
log->Printf ("SBTarget(%p)::BreakpointCreateByAddress (%p, address=%p) => SBBreakpoint(%p)", m_opaque_sp.get(), address, sb_bp.get());
}
return sb_bp;
}
SBBreakpoint
SBTarget::FindBreakpointByID (break_id_t bp_id)
{
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
SBBreakpoint sb_breakpoint;
if (m_opaque_sp && bp_id != LLDB_INVALID_BREAK_ID)
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
*sb_breakpoint = m_opaque_sp->GetBreakpointByID (bp_id);
}
if (log)
{
log->Printf ("SBTarget(%p)::FindBreakpointByID (bp_id=%d) => SBBreakpoint(%p)",
m_opaque_sp.get(), (uint32_t) bp_id, sb_breakpoint.get());
}
return sb_breakpoint;
}
uint32_t
SBTarget::GetNumBreakpoints () const
{
if (m_opaque_sp)
{
// The breakpoint list is thread safe, no need to lock
return m_opaque_sp->GetBreakpointList().GetSize();
}
return 0;
}
SBBreakpoint
SBTarget::GetBreakpointAtIndex (uint32_t idx) const
{
SBBreakpoint sb_breakpoint;
if (m_opaque_sp)
{
// The breakpoint list is thread safe, no need to lock
*sb_breakpoint = m_opaque_sp->GetBreakpointList().GetBreakpointAtIndex(idx);
}
return sb_breakpoint;
}
bool
SBTarget::BreakpointDelete (break_id_t bp_id)
{
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
bool result = false;
if (m_opaque_sp)
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
result = m_opaque_sp->RemoveBreakpointByID (bp_id);
}
if (log)
{
log->Printf ("SBTarget(%p)::BreakpointDelete (bp_id=%d) => %i", m_opaque_sp.get(), (uint32_t) bp_id, result);
}
return result;
}
bool
SBTarget::EnableAllBreakpoints ()
{
if (m_opaque_sp)
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
m_opaque_sp->EnableAllBreakpoints ();
return true;
}
return false;
}
bool
SBTarget::DisableAllBreakpoints ()
{
if (m_opaque_sp)
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
m_opaque_sp->DisableAllBreakpoints ();
return true;
}
return false;
}
bool
SBTarget::DeleteAllBreakpoints ()
{
if (m_opaque_sp)
{
Mutex::Locker api_locker (m_opaque_sp->GetAPIMutex());
m_opaque_sp->RemoveAllBreakpoints ();
return true;
}
return false;
}
uint32_t
SBTarget::GetNumModules () const
{
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
uint32_t num = 0;
if (m_opaque_sp)
{
// The module list is thread safe, no need to lock
num = m_opaque_sp->GetImages().GetSize();
}
if (log)
log->Printf ("SBTarget(%p)::GetNumModules () => %d", m_opaque_sp.get(), num);
return num;
}
void
SBTarget::Clear ()
{
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
if (log)
log->Printf ("SBTarget(%p)::Clear ()", m_opaque_sp.get());
m_opaque_sp.reset();
}
SBModule
SBTarget::FindModule (const SBFileSpec &sb_file_spec)
{
SBModule sb_module;
if (m_opaque_sp && sb_file_spec.IsValid())
{
// The module list is thread safe, no need to lock
sb_module.SetModule (m_opaque_sp->GetImages().FindFirstModuleForFileSpec (*sb_file_spec, NULL, NULL));
}
return sb_module;
}
SBModule
SBTarget::GetModuleAtIndex (uint32_t idx)
{
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
SBModule sb_module;
if (m_opaque_sp)
{
// The module list is thread safe, no need to lock
sb_module.SetModule(m_opaque_sp->GetImages().GetModuleAtIndex(idx));
}
if (log)
{
log->Printf ("SBTarget(%p)::GetModuleAtIndex (idx=%d) => SBModule(%p)",
m_opaque_sp.get(), idx, sb_module.get());
}
return sb_module;
}
SBBroadcaster
SBTarget::GetBroadcaster () const
{
LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_API));
SBBroadcaster broadcaster(m_opaque_sp.get(), false);
if (log)
log->Printf ("SBTarget(%p)::GetBroadcaster () => SBBroadcaster(%p)",
m_opaque_sp.get(), broadcaster.get());
return broadcaster;
}
bool
SBTarget::GetDescription (SBStream &description, lldb::DescriptionLevel description_level)
{
if (m_opaque_sp)
{
description.ref();
m_opaque_sp->Dump (description.get(), description_level);
}
else
description.Printf ("No value");
return true;
}
bool
SBTarget::GetDescription (SBStream &description, lldb::DescriptionLevel description_level) const
{
if (m_opaque_sp)
{
description.ref();
m_opaque_sp->Dump (description.get(), description_level);
}
else
description.Printf ("No value");
return true;
}
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