source: Sophya/trunk/SophyaLib/BaseTools/exceptions.h@ 219

// This may look like C code, but it is really -*- C++ -*-
#ifndef EXCEPTIONS_SEEN
#define EXCEPTIONS_SEEN

// Gestion des exceptions, conformemnt au manuel de reference C++
// en attendant que les compilateurs le fassent tous seuls
//
// Eric Aubourg, la Silla fevrier 95
// Pour le moment, on ne sait gerer qu'un seul type d'exception, int.
// 
// La syntaxe est
//    TRY {
//          ....
//        }
//    CATCH(i) {
//        ...
//    }
//    ENDTRY

// ou bien CATCHALL a la place de CATCH.
//

// On peut faire THROW_ tout court, qui est pareil que THROW(0)
// ou bien THROW(n)
// ou bien THROW_SAME dans un bloc CATCH

// IMPORTANT
// Tout objet susceptible d'etre cree automatiquement au cours d'un bloc
// try doit etre declare EXC_AWARE (class x EXC_AWARE {...};) ou bien
// deriver d'une telle classe.

// Tout constructeur d'une classe qui contient d'autres objets parmi ses
// champs doit se terminer par END_CONSTRUCTOR.

#include "defs.h"

#include <iostream.h>
#include "peidainit.h"

//#define NO_EXCEPTIONS
#ifdef NO_EXCEPTIONS

#define EXC_ABORT_NEG(_x)
#define EXC_ABORT_ALL(_x)

#define EXC_AWARE

#define END_CONSTRUCTOR

#define TRY if (1) {
#define CATCH(_var) } else { long _var;
#define CATCHALL } else {
#define ENDTRY }

#define THROW(_i) \
      {cerr << "Throw " << _i << " file " << __FILE__ << " line " << __LINE__;  \
       cerr << endl;                                                                                    \
       abort();}

#define THROW_ THROW(0)

#define THROW_SAME THROW(0)

#define ASSERT(_a_) if (!(_a_)) { \
     cerr << "Assertion failed " #_a_ " file " __FILE__ " line " << __LINE__ \
          << endl; \
     THROW_ }

#define RETURN(x) return(x)
#define RETURN_ return

#else
#ifdef COMPILER_EXCEPTIONS

#define EXC_ABORT_NEG(_x)
#define EXC_ABORT_ALL(_x)

#define EXC_AWARE

#define END_CONSTRUCTOR

#define TRY try
#define CATCH(_var) catch(long _var)
#define CATCHALL catch(...)
#define ENDTRY

#define THROW(_i) throw((long) _i);

#define THROW_ THROW(0)

#define THROW_SAME throw;

#define ASSERT(_a_) if (!(_a_)) { \
     cerr << "Assertion failed " #_a_ " file " __FILE__ " line " << __LINE__ \
          << endl; \
     THROW_ }

#define RETURN(x) return(x)
#define RETURN_ return

void InitFailNewHandler();
#else

#include <setjmp.h>
#include <stdlib.h>

class ExcAwareObject;

class ExcHndl {
public:
  ExcHndl(ExcHndl* up);
  ~ExcHndl();

  void SetEnv(jmp_buf& theEnv)
#ifndef __GNUG__
        {memcpy(env, theEnv, sizeof(jmp_buf));}
#else
        {env = theEnv;}
#endif
  void Throw(int exc=0, char* file=0, int line=0);
  void Add(ExcAwareObject*);
  void Forget(ExcAwareObject*);
  void Ignore(ExcAwareObject*);
  void IgnoreTab(ExcAwareObject*, size_t);
  void DelTab(ExcAwareObject*);
  void EndConstructor(void*, size_t);
  static void NoHandler(int exc=0, char* file=0, int line=0);

  ExcHndl*         nextHandler;
  
  int              theExc;
  int              hadExc;

private:
  jmp_buf          env;
  int              nObj, nObjAlloc;
  ExcAwareObject** objects;
  int              nDyn, nDynAlloc;
  ExcAwareObject** dynObjs;
  int              nDynTab, nDynTabAlloc;
  ExcAwareObject** dynTabObjs;
  size_t*          dynTabSz;
};

extern ExcHndl* topExcHndl;
extern int      _ExcAbortNeg;
extern int      _ExcAbortAll;

class ExcAwareObject {
friend class ExcHndl;
public:
  ExcAwareObject() {
    if (topExcHndl) topExcHndl->Add(this);
  }
  
  virtual ~ExcAwareObject() {
    if (topExcHndl) topExcHndl->Forget(this);
  }
  
#ifdef HAS_VEC_NEW
  void* operator new(size_t s) {
    void* p = ::operator new(s);
    if (topExcHndl) topExcHndl->Ignore((ExcAwareObject*)p);
    return p;
  }

  void* operator new(size_t /*s*/, void* p) {
    if (topExcHndl) topExcHndl->Ignore((ExcAwareObject*)p);
    return p;
  }
  
  void* operator new[](size_t s) {
    void* p = ::operator new[](s);
    if (topExcHndl) topExcHndl->IgnoreTab((ExcAwareObject*)p,s);
    return p;
  }

  void operator delete[](void* p) {
    if (topExcHndl) topExcHndl->DelTab((ExcAwareObject*)p);
    ::operator delete[](p);
  }
#else
  void* operator new(size_t s) {
    void* p = ::operator new(s);
    if (topExcHndl) topExcHndl->IgnoreTab((ExcAwareObject*)p,s);
    return p;
  }

  void* operator new(size_t s, void* p) {
    if (topExcHndl) topExcHndl->IgnoreTab((ExcAwareObject*)p,s);
    return p;
  }

  void operator delete(void* p) {
    if (topExcHndl) topExcHndl->DelTab((ExcAwareObject*)p);
    ::operator delete(p);
  }
#endif
};

//extern "C" void terminate();

void InitFailNewHandler();

// Et maintenant les macros!

// TRY cree un nouveau handler, et fait le setjmp

#define _UPHANDLER \
    { ExcHndl* tmp = topExcHndl->nextHandler; \
      delete topExcHndl;                      \
      topExcHndl = tmp; }

#define EXC_ABORT_NEG(_x) _ExcAbortNeg = _x;
#define EXC_ABORT_ALL(_x) _ExcAbortAll = _x;

#define EXC_AWARE : public virtual ExcAwareObject

#define END_CONSTRUCTOR \
if (topExcHndl) topExcHndl->EndConstructor(this, sizeof(*this));

#define TRY \
    {  topExcHndl = new ExcHndl(topExcHndl); \
       jmp_buf _jmpBuffer;                   \
       volatile int _excCaught = 0;          \
       if (!setjmp(_jmpBuffer)) {            \
          topExcHndl->SetEnv(_jmpBuffer);

#define CATCH(_var)                          \
         _UPHANDLER                          \
       } else if (topExcHndl->hadExc) {      \
          int _caughtException = topExcHndl->theExc; \
          int _var = _caughtException;       \
          _excCaught = 1;                    \
          _UPHANDLER

#define CATCHALL \
         _UPHANDLER \
       } else if (topExcHndl->hadExc) {       \
          int _caughtException = topExcHndl->theExc;\
          _excCaught = _caughtException;                 \
          _excCaught = 1;                    \
          _UPHANDLER

#define ENDTRY \
       } else _UPHANDLER\
     }

#define THROW(_i) \
      {if (!topExcHndl) ExcHndl::NoHandler(_i,__FILE__,__LINE__); \
       topExcHndl->Throw(_i,__FILE__,__LINE__);}

#define THROW_ THROW(0)

#define THROW_SAME THROW(_caughtException)

#define ASSERT(_a_) if (!(_a_)) { \
     cerr << "Assertion failed " #_a_ " file " __FILE__ " line " << __LINE__ \
          << endl; \
     THROW_ }

#define RETURN(x) { _UPHANDLER; return(x); }
#define RETURN_ { _UPHANDLER; return; }

#endif
#endif
#endif