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/// \ingroup rbd_common
///@{
/// \file myexcept.cpp
/// Exception handler.
/// The low level classes for
/// - my exception class hierarchy
/// - the functions needed for my simulated exceptions
/// - the Tracer mechanism
/// - routines for checking whether new and delete calls are balanced
///
// Copyright (C) 1993,4,6: R B Davies
#define WANT_STREAM // include.h will get stream fns
#define WANT_STRING
#include "include.h" // include standard files
#include "myexcept.h" // for exception handling
#ifdef use_namespace
namespace RBD_COMMON {
#endif
//#define REG_DEREG // for print out uses of new/delete
//#define CLEAN_LIST // to print entries being added to
// or deleted from cleanup list
#ifdef SimulateExceptions
void Throw()
{
for (Janitor* jan = JumpBase::jl->janitor; jan; jan = jan->NextJanitor)
jan->CleanUp();
JumpItem* jx = JumpBase::jl->ji; // previous jumpbase;
if ( !jx ) { Terminate(); } // jl was initial JumpItem
JumpBase::jl = jx; // drop down a level; cannot be in front
// of previous line
Tracer::last = JumpBase::jl->trace;
longjmp(JumpBase::jl->env, 1);
}
#endif // end of simulate exceptions
unsigned long BaseException::Select;
char* BaseException::what_error;
int BaseException::SoFar;
int BaseException::LastOne;
BaseException::BaseException(const char* a_what)
{
Select++; SoFar = 0;
if (!what_error) // make space for exception message
{
LastOne = 511;
what_error = new char[512];
if (!what_error) // fail to make space
{
LastOne = 0;
what_error = (char *)"No heap space for exception message\n";
}
}
AddMessage("\n\nAn exception has been thrown\n");
AddMessage(a_what);
if (a_what) Tracer::AddTrace();
}
void BaseException::AddMessage(const char* a_what)
{
if (a_what)
{
int l = strlen(a_what); int r = LastOne - SoFar;
if (l < r) { strcpy(what_error+SoFar, a_what); SoFar += l; }
else if (r > 0)
{
strncpy(what_error+SoFar, a_what, r);
what_error[LastOne] = 0;
SoFar = LastOne;
}
}
}
void BaseException::AddInt(int value)
{
bool negative;
if (value == 0) { AddMessage("0"); return; }
else if (value < 0) { value = -value; negative = true; }
else negative = false;
int n = 0; int v = value; // how many digits will we need?
while (v > 0) { v /= 10; n++; }
if (negative) n++;
if (LastOne-SoFar < n) { AddMessage("***"); return; }
SoFar += n; n = SoFar; what_error[n] = 0;
while (value > 0)
{
int nv = value / 10; int rm = value - nv * 10; value = nv;
what_error[--n] = (char)(rm + '0');
}
if (negative) what_error[--n] = '-';
return;
}
void Tracer::PrintTrace()
{
cout << "\n";
for (Tracer* et = last; et; et=et->previous)
cout << " * " << et->entry << "\n";
}
void Tracer::AddTrace()
{
if (last)
{
BaseException::AddMessage("Trace: ");
BaseException::AddMessage(last->entry);
for (Tracer* et = last->previous; et; et=et->previous)
{
BaseException::AddMessage("; ");
BaseException::AddMessage(et->entry);
}
BaseException::AddMessage(".\n");
}
}
#ifdef SimulateExceptions
Janitor::Janitor()
{
if (do_not_link)
{
do_not_link = false; NextJanitor = 0; OnStack = false;
#ifdef CLEAN_LIST
cout << "Not added to clean-list " << (unsigned long)this << "\n";
#endif
}
else
{
OnStack = true;
#ifdef CLEAN_LIST
cout << "Add to clean-list " << (unsigned long)this << "\n";
#endif
NextJanitor = JumpBase::jl->janitor; JumpBase::jl->janitor=this;
}
}
Janitor::~Janitor()
{
// expect the item to be deleted to be first on list
// but must be prepared to search list
if (OnStack)
{
#ifdef CLEAN_LIST
cout << "Delete from clean-list " << (unsigned long)this << "\n";
#endif
Janitor* lastjan = JumpBase::jl->janitor;
if (this == lastjan) JumpBase::jl->janitor = NextJanitor;
else
{
for (Janitor* jan = lastjan->NextJanitor; jan;
jan = lastjan->NextJanitor)
{
if (jan==this)
{ lastjan->NextJanitor = jan->NextJanitor; return; }
lastjan=jan;
}
Throw(BaseException(
"Cannot resolve memory linked list\nSee notes in myexcept.cpp for details\n"
));
// This message occurs when a call to ~Janitor() occurs, apparently
// without a corresponding call to Janitor(). This could happen if my
// way of deciding whether a constructor is being called by new
// fails.
// It may happen if you are using my simulated exceptions and also have
// your compiler s exceptions turned on.
// It can also happen if you have a class derived from Janitor
// which does not include a copy constructor [ eg X(const &X) ].
// Possibly also if delete is applied an object on the stack (ie not
// called by new). Otherwise, it is a bug in myexcept or your compiler.
// If you do not #define TEMPS_DESTROYED_QUICKLY you will get this
// error with Microsoft C 7.0. There are probably situations where
// you will get this when you do define TEMPS_DESTROYED_QUICKLY. This
// is a bug in MSC. Beware of "operator" statements for defining
// conversions; particularly for converting from a Base class to a
// Derived class.
// You may get away with simply deleting this error message and Throw
// statement if you can not find a better way of overcoming the
// problem. In any case please tell me if you get this error message,
// particularly for compilers apart from Microsoft C 7.0.
}
}
}
JumpItem* JumpBase::jl; // will be set to zero
jmp_buf JumpBase::env;
bool Janitor::do_not_link; // will be set to false
int JanitorInitializer::ref_count;
JanitorInitializer::JanitorInitializer()
{
if (ref_count++ == 0) new JumpItem;
// need JumpItem at head of list
}
#endif // end of SimulateExceptions
Tracer* Tracer::last; // will be set to zero
void Terminate()
{
cout << "\n\nThere has been an exception with no handler - exiting";
const char* what = BaseException::what();
if (what) cout << what << "\n";
exit(1);
}
#ifdef DO_FREE_CHECK
// Routines for tracing whether new and delete calls are balanced
FreeCheckLink::FreeCheckLink() : next(FreeCheck::next)
{ FreeCheck::next = this; }
FCLClass::FCLClass(void* t, char* name) : ClassName(name) { ClassStore=t; }
FCLRealArray::FCLRealArray(void* t, char* o, int s)
: Operation(o), size(s) { ClassStore=t; }
FCLIntArray::FCLIntArray(void* t, char* o, int s)
: Operation(o), size(s) { ClassStore=t; }
FreeCheckLink* FreeCheck::next;
int FreeCheck::BadDelete;
void FCLClass::Report()
{ cout << " " << ClassName << " " << (unsigned long)ClassStore << "\n"; }
void FCLRealArray::Report()
{
cout << " " << Operation << " " << (unsigned long)ClassStore <<
" " << size << "\n";
}
void FCLIntArray::Report()
{
cout << " " << Operation << " " << (unsigned long)ClassStore <<
" " << size << "\n";
}
void FreeCheck::Register(void* t, char* name)
{
FCLClass* f = new FCLClass(t,name);
if (!f) { cout << "Out of memory in FreeCheck\n"; exit(1); }
#ifdef REG_DEREG
cout << "Registering " << name << " " << (unsigned long)t << "\n";
#endif
}
void FreeCheck::RegisterR(void* t, char* o, int s)
{
FCLRealArray* f = new FCLRealArray(t,o,s);
if (!f) { cout << "Out of memory in FreeCheck\n"; exit(1); }
#ifdef REG_DEREG
cout << o << " " << s << " " << (unsigned long)t << "\n";
#endif
}
void FreeCheck::RegisterI(void* t, char* o, int s)
{
FCLIntArray* f = new FCLIntArray(t,o,s);
if (!f) { cout << "Out of memory in FreeCheck\n"; exit(1); }
#ifdef REG_DEREG
cout << o << " " << s << " " << (unsigned long)t << "\n";
#endif
}
void FreeCheck::DeRegister(void* t, char* name)
{
FreeCheckLink* last = 0;
#ifdef REG_DEREG
cout << "Deregistering " << name << " " << (unsigned long)t << "\n";
#endif
for (FreeCheckLink* fcl = next; fcl; fcl = fcl->next)
{
if (fcl->ClassStore==t)
{
if (last) last->next = fcl->next; else next = fcl->next;
delete fcl; return;
}
last = fcl;
}
cout << "\nRequest to delete non-existent object of class and location:\n";
cout << " " << name << " " << (unsigned long)t << "\n";
BadDelete++;
Tracer::PrintTrace();
cout << "\n";
}
void FreeCheck::DeRegisterR(void* t, char* o, int s)
{
FreeCheckLink* last = 0;
#ifdef REG_DEREG
cout << o << " " << s << " " << (unsigned long)t << "\n";
#endif
for (FreeCheckLink* fcl = next; fcl; fcl = fcl->next)
{
if (fcl->ClassStore==t)
{
if (last) last->next = fcl->next; else next = fcl->next;
if (s >= 0 && ((FCLRealArray*)fcl)->size != s)
{
cout << "\nArray sizes do not agree:\n";
cout << " " << o << " " << (unsigned long)t
<< " " << ((FCLRealArray*)fcl)->size << " " << s << "\n";
Tracer::PrintTrace();
cout << "\n";
}
delete fcl; return;
}
last = fcl;
}
cout << "\nRequest to delete non-existent real array:\n";
cout << " " << o << " " << (unsigned long)t << " " << s << "\n";
BadDelete++;
Tracer::PrintTrace();
cout << "\n";
}
void FreeCheck::DeRegisterI(void* t, char* o, int s)
{
FreeCheckLink* last = 0;
#ifdef REG_DEREG
cout << o << " " << s << " " << (unsigned long)t << "\n";
#endif
for (FreeCheckLink* fcl = next; fcl; fcl = fcl->next)
{
if (fcl->ClassStore==t)
{
if (last) last->next = fcl->next; else next = fcl->next;
if (s >= 0 && ((FCLIntArray*)fcl)->size != s)
{
cout << "\nArray sizes do not agree:\n";
cout << " " << o << " " << (unsigned long)t
<< " " << ((FCLIntArray*)fcl)->size << " " << s << "\n";
Tracer::PrintTrace();
cout << "\n";
}
delete fcl; return;
}
last = fcl;
}
cout << "\nRequest to delete non-existent int array:\n";
cout << " " << o << " " << (unsigned long)t << " " << s << "\n";
BadDelete++;
Tracer::PrintTrace();
cout << "\n";
}
void FreeCheck::Status()
{
if (next)
{
cout << "\nObjects of the following classes remain undeleted:\n";
for (FreeCheckLink* fcl = next; fcl; fcl = fcl->next) fcl->Report();
cout << "\n";
}
else cout << "\nNo objects remain undeleted\n\n";
if (BadDelete)
{
cout << "\nThere were " << BadDelete <<
" requests to delete non-existent items\n\n";
}
}
#endif // end of DO_FREE_CHECK
// derived exception bodies
Logic_error::Logic_error(const char* a_what) : BaseException()
{
Select = BaseException::Select;
AddMessage("Logic error:- "); AddMessage(a_what);
if (a_what) Tracer::AddTrace();
}
Runtime_error::Runtime_error(const char* a_what)
: BaseException()
{
Select = BaseException::Select;
AddMessage("Runtime error:- "); AddMessage(a_what);
if (a_what) Tracer::AddTrace();
}
Domain_error::Domain_error(const char* a_what) : Logic_error()
{
Select = BaseException::Select;
AddMessage("domain error\n"); AddMessage(a_what);
if (a_what) Tracer::AddTrace();
}
Invalid_argument::Invalid_argument(const char* a_what) : Logic_error()
{
Select = BaseException::Select;
AddMessage("invalid argument\n"); AddMessage(a_what);
if (a_what) Tracer::AddTrace();
}
Length_error::Length_error(const char* a_what) : Logic_error()
{
Select = BaseException::Select;
AddMessage("length error\n"); AddMessage(a_what);
if (a_what) Tracer::AddTrace();
}
Out_of_range::Out_of_range(const char* a_what) : Logic_error()
{
Select = BaseException::Select;
AddMessage("out of range\n"); AddMessage(a_what);
if (a_what) Tracer::AddTrace();
}
//Bad_cast::Bad_cast(const char* a_what) : Logic_error()
//{
// Select = BaseException::Select;
// AddMessage("bad cast\n"); AddMessage(a_what);
// if (a_what) Tracer::AddTrace();
//}
//Bad_typeid::Bad_typeid(const char* a_what) : Logic_error()
//{
// Select = BaseException::Select;
// AddMessage("bad type id.\n"); AddMessage(a_what);
// if (a_what) Tracer::AddTrace();
//}
Range_error::Range_error(const char* a_what) : Runtime_error()
{
Select = BaseException::Select;
AddMessage("range error\n"); AddMessage(a_what);
if (a_what) Tracer::AddTrace();
}
Overflow_error::Overflow_error(const char* a_what) : Runtime_error()
{
Select = BaseException::Select;
AddMessage("overflow error\n"); AddMessage(a_what);
if (a_what) Tracer::AddTrace();
}
Bad_alloc::Bad_alloc(const char* a_what) : BaseException()
{
Select = BaseException::Select;
AddMessage("bad allocation\n"); AddMessage(a_what);
if (a_what) Tracer::AddTrace();
}
unsigned long Logic_error::Select;
unsigned long Runtime_error::Select;
unsigned long Domain_error::Select;
unsigned long Invalid_argument::Select;
unsigned long Length_error::Select;
unsigned long Out_of_range::Select;
//unsigned long Bad_cast::Select;
//unsigned long Bad_typeid::Select;
unsigned long Range_error::Select;
unsigned long Overflow_error::Select;
unsigned long Bad_alloc::Select;
#ifdef use_namespace
}
#endif
///@}
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