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oscl_error_imp_jumps.h

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// -*- c++ -*-
// = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

//               O S C L _ E R R O R _ I M P _ J U M P S

// = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

#ifndef OSCL_ERROR_IMP_JUMPS_H_INCLUDED
#define OSCL_ERROR_IMP_JUMPS_H_INCLUDED

#ifndef OSCL_ERROR_TRAPCLEANUP_H_INCLUDED
#include "oscl_error_trapcleanup.h"
#endif
#ifndef OSCL_ASSERT_H_INCLUDED
#include "oscl_assert.h"
#endif

// Implemenation of Leave using Setjmp / Longjmp.

//ANSI setjmp/longjmp implementation.  This is needed on any OS
//that does not support C++ exceptions.  This is a complete implementation.

#ifndef OSCLCONFIG_ERROR_H_INCLUDED
#include "osclconfig_error.h"
#endif

#ifndef OSCL_ERROR_TRAPCLEANUP_H_INCLUDED
#include "oscl_error_trapcleanup.h"
#endif
#ifndef OSCL_DEFALLOC_H_INCLUDED
#include "oscl_defalloc.h"
#endif
#ifndef OSCL_ERROR_H_INCLUDED
#include "oscl_error.h"
#endif

class Oscl_DefAlloc;

//this defines the maximum depth of the jump mark stack.
#define OSCL_JUMP_MAX_JUMP_MARKS OSCL_MAX_TRAP_LEVELS


//OsclJump class
class OsclJump
{
    public:
        //for use in macros only.

        OSCL_IMPORT_REF static void StaticJump(int a);

        void Jump(int a)
        {
            if (!Top())
            {
                //Note: you can't leave here, since leave would
                //invoke this routine again.  It is not safe to return
                //either, because calling code is expecting an execution
                //end.
                OSCL_ASSERT(false);
                _OSCL_Abort();
            }
            longjmp(*Top(), a);
        }

        jmp_buf *Top()
        {
            OSCL_ASSERT(iJumpIndex >= 0);
            return &iJumpArray[iJumpIndex];
        }

        ~OsclJump()
        {
            //jump mark stack should be empty at this point.
            OSCL_ASSERT(iJumpIndex == (-1));
        }

    private:
        OsclJump(): iJumpIndex(-1) {}

        void PushMark()
        {
            OSCL_ASSERT(iJumpIndex < (OSCL_JUMP_MAX_JUMP_MARKS - 1));//jump stack is full!
            iJumpIndex++;
        }

        void PopMark()
        {
            OSCL_ASSERT(iJumpIndex >= 0);//jump stack is empty!
            iJumpIndex--;
        }

        jmp_buf iJumpArray[OSCL_JUMP_MAX_JUMP_MARKS];

        //index to top of stack, or (-1) when stack is empty
        int32 iJumpIndex;

        friend class OsclErrorTrapImp;
};


//internal jump type codes.
#define internalLeave (-1)

//Leave uses the OsclJump methods
#define PVError_DoLeave() OsclJump::StaticJump(internalLeave)

//_PV_TRAP macro catches leaves.
//_r is leave code, _s is statements to execute.
#define _PV_TRAP(__r,__s)\
        __r=OsclErrNone;\
        {\
                OsclErrorTrapImp* __trap=OsclErrorTrapImp::Trap();\
                if(!__trap){__s;}else{\
                int __tr=setjmp(*(__trap->iJumpData->Top()));\
                if (__tr==0)\
                {__s;}\
                else if (__tr==internalLeave)\
                {__r=__trap->iLeave;}\
                __trap->UnTrap();}\
        }

//Same as _PV_TRAP but avoids a TLS lookup.
// __trapimp is the OsclErrorTrapImp* for the calling thread.
#define _PV_TRAP_NO_TLS(__trapimp,__r,__s)\
        __r=OsclErrNone;\
        {\
                OsclErrorTrapImp* __trap=OsclErrorTrapImp::TrapNoTls(__trapimp);\
                if(!__trap){__s;}else{\
                int __tr=setjmp(*(__trap->iJumpData->Top()));\
                if (__tr==0)\
                {__s;}\
                else if (__tr==internalLeave)\
                {__r=__trap->iLeave;}\
                __trap->UnTrap();}\
        }


#endif // OSCL_ERROR_IMP_JUMPS_H_INCLUDED

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