sc::Debugger Class Reference

The Debugger class describes what should be done when a catastrophic error causes unexpected program termination. More...

#include <bug.h>

Inheritance diagram for sc::Debugger:

Collaboration diagram for sc::Debugger:

Public Member Functions
	Debugger (const char *exec=0)
	Debugger (const Ref< KeyVal > &)
	The KeyVal constructor understands the following keywords: More...
	Debugger (StateIn &)
virtual void	debug (const char *reason=0)
	The debug member attempts to start a debugger running on the current process.
virtual void	traceback (const char *reason=0)
	The traceback member attempts a stack traceback for the current process. More...
virtual void	set_debug_on_signal (int)
	Turn on or off debugging on a signel. The default is on.
virtual void	set_traceback_on_signal (int)
	Turn on or off traceback on a signel. The default is on.
virtual void	set_exit_on_signal (int)
	Turn on or off exit after a signel. The default is on.
virtual void	set_wait_for_debugger (int)
	Turn on or off running an infinite loop after the debugger is started. More...
virtual void	handle (int sig)
	The Debugger will be actived when sig is caught.
virtual void	handle_defaults ()
	This calls handle(int) with all of the major signals.
virtual void	set_prefix (const char *p)
	This sets a prefix which preceeds all messages printing by Debugger.
virtual void	set_prefix (int p)
	Set the prefix to the decimal represention of p followed by a ": ".
virtual void	set_cmd (const char *)
	Sets the command to be exectuted when debug is called. More...
virtual void	default_cmd ()
	Calls set_cmd with a hopefully suitable default.
virtual void	set_exec (const char *)
	Set the name of the exectuble for the current process. More...
virtual void	got_signal (int sig)
	Called with signal sig is received. This is mainly for internal use.
void	save_data_state (StateOut &)
	Save the base classes (with save_data_state) and the members in the same order that the StateIn CTOR initializes them. More...
Public Member Functions inherited from sc::SavableState
SavableState &	operator= (const SavableState &)
void	save_state (StateOut &)
	Save the state of the object as specified by the StateOut object. More...
void	save_object_state (StateOut &)
	This can be used for saving state when the exact type of the object is known for both the save and the restore. More...
virtual void	save_vbase_state (StateOut &)
	Save the virtual bases for the object. More...
Public Member Functions inherited from sc::DescribedClass
	DescribedClass (const DescribedClass &)
DescribedClass &	operator= (const DescribedClass &)
ClassDesc *	class_desc () const throw ()
	This returns the unique pointer to the ClassDesc corresponding to the given type_info object. More...
const char *	class_name () const
	Return the name of the object's exact type.
int	class_version () const
	Return the version of the class.
virtual void	print (std::ostream &=ExEnv::out0()) const
	Print the object.
Public Member Functions inherited from sc::RefCount
int	lock_ptr () const
	Lock this object.
int	unlock_ptr () const
	Unlock this object.
void	use_locks (bool inVal)
	start and stop using locks on this object
refcount_t	nreference () const
	Return the reference count.
refcount_t	reference ()
	Increment the reference count and return the new count.
refcount_t	dereference ()
	Decrement the reference count and return the new count.
int	managed () const
void	unmanage ()
	Turn off the reference counting mechanism for this object. More...
int	managed () const
	Return 1 if the object is managed. Otherwise return 0.
Public Member Functions inherited from sc::Identity
Identifier	identifier ()
	Return the Identifier for this argument. More...

Static Public Member Functions
static void	set_default_debugger (const Ref< Debugger > &)
	Set the global default debugger. The initial value is null.
static Debugger *	default_debugger ()
	Return the global default debugger.
Static Public Member Functions inherited from sc::SavableState
static void	save_state (SavableState *s, StateOut &)
static SavableState *	restore_state (StateIn &si)
	Restores objects saved with save_state. More...
static SavableState *	key_restore_state (StateIn &si, const char *keyword)
	Like restore_state, but keyword is used to override values while restoring.
static SavableState *	dir_restore_state (StateIn &si, const char *objectname, const char *keyword=0)

Protected Member Functions
void	init ()
Protected Member Functions inherited from sc::SavableState
	SavableState (const SavableState &)
	SavableState (StateIn &)
	Each derived class StateIn CTOR handles the restore corresponding to calling save_object_state, save_vbase_state, and save_data_state listed above. More...
Protected Member Functions inherited from sc::RefCount
	RefCount (const RefCount &)
RefCount &	operator= (const RefCount &)

Protected Attributes
char *	prefix_
char *	exec_
char *	cmd_
volatile int	debugger_ready_
int	debug_
int	traceback_
int	exit_on_signal_
int	sleep_
int	wait_for_debugger_
int	handle_sigint_
int *	mysigs_

Static Protected Attributes
static Debugger *	default_debugger_

Detailed Description

The Debugger class describes what should be done when a catastrophic error causes unexpected program termination.

It can try things such as start a debugger running where the program died or it can attempt to produce a stack traceback showing roughly where the program died. These attempts will not always succeed.

Constructor & Destructor Documentation

Debugger()

sc::Debugger::Debugger

(

const Ref< KeyVal > &

)

The KeyVal constructor understands the following keywords:

debug

Try to start a debugger when an error occurs. Doesn't work on all machines. The default is true, if possible.

traceback

Try to print out a traceback extracting return addresses from the call stack. Doesn't work on most machines. The default is true, if possible.

exit

Exit on errors. The default is true.

wait_for_debugger

When starting a debugger go into an infinite loop to give the debugger a chance to attach to the process. The default is true.

sleep

When starting a debugger wait this many seconds to give the debugger a chance to attach to the process. The default is 0.

handle_defaults

Handle a standard set of signals such as SIGBUS, SIGSEGV, etc. The default is true.

prefix

Gives a string that is printed before each line that is printed by Debugger. The default is nothing.

cmd

Gives a command to be executed to start the debugger. The default varies with machine.

Member Function Documentation

save_data_state()

void sc::Debugger::save_data_state ( StateOut &  )

virtual

Save the base classes (with save_data_state) and the members in the same order that the StateIn CTOR initializes them.

This must be implemented by the derived class if the class has data.

Reimplemented from sc::SavableState.

set_cmd()

virtual void sc::Debugger::set_cmd ( const char *  )

virtual

Sets the command to be exectuted when debug is called.

The character sequence "$(EXEC)" is replaced by the executable name (see set_exec), "$(PID)" is replaced by the current process id, and "$(PREFIX)" is replaced by the prefix.

set_exec()

virtual void sc::Debugger::set_exec ( const char *  )

virtual

Set the name of the exectuble for the current process.

It is up to the programmer to set this, even if the Debugger is initialized with the KeyVal constructor.

set_wait_for_debugger()

virtual void sc::Debugger::set_wait_for_debugger ( int  )

virtual

Turn on or off running an infinite loop after the debugger is started.

This loop gives the debugger a chance to attack to the process. The default is on.

traceback()

virtual void sc::Debugger::traceback ( const char *  reason = 0 )

virtual

The traceback member attempts a stack traceback for the current process.

A symbol table must be saved for the executable if any sense is to be made of the traceback. Tracebacks are currently available only for a limited number of architectures.

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The documentation for this class was generated from the following file:

• bug.h