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[/] [forwardcom/] [examples/] [event.as] - Blame information for rev 168

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1 133 Agner
/****************************  events.as  *************************************
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* Author:        Agner Fog
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* date created:  2018-03-23
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* Last modified: 2018-03-23
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* Version:       1.00
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* Project:       ForwardCom example
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* Description:   Test event handler system
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*
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* Copyright 2018 GNU General Public License http://www.gnu.org/licenses
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******************************************************************************/
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// define event IDs
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%EVT_CONSTRUCT = 1           // call static constructors and initialization procedures before calling main
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%EVT_DESTRUCT  = 2           // call static destructors and clean up after return from main
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%EVT_MY_DEF    = 0x100       // arbitrary user-defined event id
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%KEY           = 1           // arbitrary key for my event
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%DEFAULT_PRIORITY = 0x1000   // default event priority
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/*
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   Event records must be stored in a special read-only section with attribute 'event_hand'.
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   These records will be reordered and combined by the linker.
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   Each record contains:
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   1. A scaled relative pointer to the event handler function
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   2. Event priority
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   3. Key
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   4. Event ID
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*/
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events section read event_hand
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int32 (constructor-__ip_base)/4, DEFAULT_PRIORITY,   0,   EVT_CONSTRUCT
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int32 (destructor-__ip_base)/4,  DEFAULT_PRIORITY,   0,   EVT_DESTRUCT
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int32 (event1-__ip_base)/4,      DEFAULT_PRIORITY,   KEY, EVT_MY_DEF
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int32 (event2-__ip_base)/4,      DEFAULT_PRIORITY+1, KEY, EVT_MY_DEF
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events end
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const section read ip                            // read-only data section
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// char strings with terminating zero
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hello:  int8 "\nMain called", 0
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constr: int8 "\nTesting event handler system:\n\n\nConstructor called", 0
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destr:  int8 "\nDestructor called\n\n", 0
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texte1: int8 "\nEvent handler 1 called", 0
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texte2: int8 "\nEvent handler 2 called (higher priority)", 0
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const end
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code section execute align = 4                   // code section
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extern __ip_base: ip                             // reference point
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extern _puts: function                           // library function: write string to stdout
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extern _raise_event: function                    // library function: make an event
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_main function public                            // main is the program entry called by the startup code
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int64 r0 = address([hello])                      // calculate address of string
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call _puts                                       // call puts: write string pointed to by r0
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// now create an event with key 1 and event ID = EVT_MY_DEF
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int64 r0 = KEY + (EVT_MY_DEF << 32)              // constant expression calculated by assembler
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call _raise_event                                // make the event
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int64 r0 = 0                                     // program return value
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return
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_main end
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// this function is assigned to the EVT_CONSTRUCT event to be called before main
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constructor function
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int64 r0 = address([constr])                     // calculate address of string
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call _puts                                       // call puts. parameter is in r0
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int64 r0 = 1                                     // return 1 to allow further event handlers
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return
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constructor end
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// this function is assigned to the EVT_DESTRUCT event to be called after main
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destructor function
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int64 r0 = address([destr])                      // calculate address of string
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call _puts                                       // call puts. parameter is in r0
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int64 r0 = 1                                     // return 1 to allow further event handlers
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return
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destructor end
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// this function is assigned to the user-defined EVT_MY_DEF event to be called at this custum event
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event1 function
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int64 r0 = address([texte1])                     // calculate address of string
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call _puts                                       // call puts. parameter is in r0
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int64 r0 = 1                                     // return 1 to allow further event handlers
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return
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event1 end
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// this function is also assigned to the user-defined EVT_MY_DEF, but with a higher priority. It will be called first
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event2 function
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int64 r0 = address([texte2])                     // calculate address of string
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call _puts                                       // call puts. parameter is in r0
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int64 r0 = 1                                     // return 1 to allow further event handlers
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return
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event2 end
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code end

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