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Annotation of OpenXM/src/kan96xx/plugin/sample.c, Revision 1.1

1.1     ! maekawa     1: #include <stdio.h>
        !             2: #include "../Kan/datatype.h"
        !             3: #include "../Kan/stackm.h"
        !             4: #include "../Kan/kclass.h"
        !             5:
        !             6: #include "sample.h"
        !             7:
        !             8: /*
        !             9:   options for Kan/Makefile
        !            10: PLUGIN = ../plugin
        !            11: PLUGIN_PROTOTYPE  = $(PLUGIN)/sample.h
        !            12: PLUGIN_LIB  = $(PLUGIN)/sample.a
        !            13: PLUGIN_EXT = $(PLUGIN)/sample.hh
        !            14: PLUGIN_SM1 =$(PLUGIN)/sample.sm1
        !            15: PLUGIN_LINKFLAG =
        !            16: */
        !            17:
        !            18: static struct operandStack *SharedStack = NULL;
        !            19: static struct object Kplugin_NullObject;
        !            20:
        !            21: /*  Sample is a very simple stack machine.
        !            22:     There are only one operation "add" on the shared stack.
        !            23:     Kplugin_sample(KPLUGIN_SAMPLE_INIT,
        !            24:                    [ new-operand-stack-for-the-shared-stack ]);
        !            25:     Pplugin_sample(KPLUGIN_SAMPLE_ADD, [ ] ); push the result on the shared
        !            26:                                               stack.
        !            27: */
        !            28:
        !            29: int Kplugin_sample(int opcode, struct object obj) {
        !            30:   /* obj is assumed to be an array. */
        !            31:   struct object ob1,ob2,ob3;
        !            32:   static initialized = 0;
        !            33:   if (opcode != KPLUGIN_SAMPLE_INIT && !initialized) {
        !            34:     errorSample("This component is not initialized.");
        !            35:     return(-1);
        !            36:   }
        !            37:   switch(opcode) {
        !            38:   case KPLUGIN_SAMPLE_INIT:
        !            39:     if (getoaSize(obj) < 1) {
        !            40:       errorSample("No argument for opcode=0 (initialization).");
        !            41:       return(-1);
        !            42:     }
        !            43:     ob1 = getoa(obj,0);
        !            44:     if (ectag(ob1) != CLASSNAME_OPERANDSTACK) {
        !            45:       errorSample("Argument must be an operand stack.");
        !            46:       return(-1);
        !            47:     }
        !            48:     SharedStack = (struct operandStack *) ecbody(ob1);
        !            49:     fprintf(stderr,"Initializing plugin_sample\n");
        !            50:     initialized = 1;
        !            51:     Kplugin_NullObject.tag = Snull;
        !            52:     break;
        !            53:   case KPLUGIN_SAMPLE_SELECT:
        !            54:     return(1); /* finished. */
        !            55:     break;
        !            56:   case KPLUGIN_SAMPLE_WAIT:
        !            57:     return(0);
        !            58:     break;
        !            59:   case KPLUGIN_SAMPLE_ADD:
        !            60:     ob2 = Kplugin_pop(SharedStack);  printf("%d\n",ob2.lc.ival);
        !            61:     ob1 = Kplugin_pop(SharedStack);  printf("%d\n",ob1.lc.ival);
        !            62:     ob1.lc.ival += ob2.lc.ival;
        !            63:     Kplugin_push(ob1,SharedStack);
        !            64:     break;
        !            65:   default:
        !            66:     errorSample("plugin_sample: unknown op-code.");
        !            67:     return(-1);
        !            68:     break;
        !            69:   }
        !            70:   return(0);
        !            71: }
        !            72:
        !            73: /* Should we use functions to handle operand stacks defined in
        !            74:    ../Kan/  or we should have our own functions to handle operand stack?
        !            75:   We should copy functions to handle stacks from ../Kan.
        !            76: */
        !            77: int Kplugin_push(struct object ob,struct operandStack *operandstack)
        !            78: {
        !            79:   (operandstack->ostack)[(operandstack->sp)++] = ob;
        !            80:   if ((operandstack->sp) >= (operandstack->size)) {
        !            81:     errorSample("Operand stack overflow.");
        !            82:     (operandstack->sp)--;
        !            83:     return(-1);
        !            84:   }
        !            85:   return(0);
        !            86: }
        !            87:
        !            88: struct object Kplugin_pop(struct operandStack *operandstack)
        !            89: {
        !            90:   if ((operandstack->sp) <= 0) {
        !            91:     return( Kplugin_NullObject );
        !            92:   }else{
        !            93:     return( (operandstack->ostack)[--(operandstack->sp)]);
        !            94:   }
        !            95: }
        !            96:
        !            97: struct object Kplugin_peek(int k,struct operandStack *operandstack)
        !            98: {
        !            99:   if (((operandstack->ostack)-k-1) < 0) {
        !           100:     return( Kplugin_NullObject );
        !           101:   }else{
        !           102:     return( (operandstack->ostack)[(operandstack->sp)-k-1]);
        !           103:   }
        !           104: }
        !           105:
        !           106:
        !           107: static void errorSample(char *s) {
        !           108:   fprintf(stderr,"Error in plugin/sample: %s\n");
        !           109:   /* or push error message in the sharedStack. */
        !           110: }
        !           111:
        !           112: