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Annotation of OpenXM/src/kan96xx/plugin/sample.c, Revision 1.3

1.3     ! takayama    1: /* $OpenXM: OpenXM/src/kan96xx/plugin/sample.c,v 1.2 2000/01/16 07:55:48 takayama Exp $ */
1.1       maekawa     2: #include <stdio.h>
                      3: #include "../Kan/datatype.h"
                      4: #include "../Kan/stackm.h"
                      5: #include "../Kan/kclass.h"
                      6:
                      7: #include "sample.h"
                      8:
                      9: /*
                     10:   options for Kan/Makefile
                     11: PLUGIN = ../plugin
                     12: PLUGIN_PROTOTYPE  = $(PLUGIN)/sample.h
                     13: PLUGIN_LIB  = $(PLUGIN)/sample.a
                     14: PLUGIN_EXT = $(PLUGIN)/sample.hh
                     15: PLUGIN_SM1 =$(PLUGIN)/sample.sm1
                     16: PLUGIN_LINKFLAG =
                     17: */
                     18:
                     19: static struct operandStack *SharedStack = NULL;
1.3     ! takayama   20: static struct object Kplugin_NullObject = OINIT;
1.1       maekawa    21:
                     22: /*  Sample is a very simple stack machine.
                     23:     There are only one operation "add" on the shared stack.
                     24:     Kplugin_sample(KPLUGIN_SAMPLE_INIT,
                     25:                    [ new-operand-stack-for-the-shared-stack ]);
                     26:     Pplugin_sample(KPLUGIN_SAMPLE_ADD, [ ] ); push the result on the shared
                     27:                                               stack.
                     28: */
                     29:
                     30: int Kplugin_sample(int opcode, struct object obj) {
                     31:   /* obj is assumed to be an array. */
1.3     ! takayama   32:   struct object ob1 = OINIT;
        !            33:   struct object ob2 = OINIT;
        !            34:   struct object ob3 = OINIT;
1.1       maekawa    35:   static initialized = 0;
                     36:   if (opcode != KPLUGIN_SAMPLE_INIT && !initialized) {
                     37:     errorSample("This component is not initialized.");
                     38:     return(-1);
                     39:   }
                     40:   switch(opcode) {
                     41:   case KPLUGIN_SAMPLE_INIT:
                     42:     if (getoaSize(obj) < 1) {
                     43:       errorSample("No argument for opcode=0 (initialization).");
                     44:       return(-1);
                     45:     }
                     46:     ob1 = getoa(obj,0);
                     47:     if (ectag(ob1) != CLASSNAME_OPERANDSTACK) {
                     48:       errorSample("Argument must be an operand stack.");
                     49:       return(-1);
                     50:     }
                     51:     SharedStack = (struct operandStack *) ecbody(ob1);
                     52:     fprintf(stderr,"Initializing plugin_sample\n");
                     53:     initialized = 1;
                     54:     Kplugin_NullObject.tag = Snull;
                     55:     break;
                     56:   case KPLUGIN_SAMPLE_SELECT:
                     57:     return(1); /* finished. */
                     58:     break;
                     59:   case KPLUGIN_SAMPLE_WAIT:
                     60:     return(0);
                     61:     break;
                     62:   case KPLUGIN_SAMPLE_ADD:
                     63:     ob2 = Kplugin_pop(SharedStack);  printf("%d\n",ob2.lc.ival);
                     64:     ob1 = Kplugin_pop(SharedStack);  printf("%d\n",ob1.lc.ival);
                     65:     ob1.lc.ival += ob2.lc.ival;
                     66:     Kplugin_push(ob1,SharedStack);
                     67:     break;
                     68:   default:
                     69:     errorSample("plugin_sample: unknown op-code.");
                     70:     return(-1);
                     71:     break;
                     72:   }
                     73:   return(0);
                     74: }
                     75:
                     76: /* Should we use functions to handle operand stacks defined in
                     77:    ../Kan/  or we should have our own functions to handle operand stack?
                     78:   We should copy functions to handle stacks from ../Kan.
                     79: */
                     80: int Kplugin_push(struct object ob,struct operandStack *operandstack)
                     81: {
                     82:   (operandstack->ostack)[(operandstack->sp)++] = ob;
                     83:   if ((operandstack->sp) >= (operandstack->size)) {
                     84:     errorSample("Operand stack overflow.");
                     85:     (operandstack->sp)--;
                     86:     return(-1);
                     87:   }
                     88:   return(0);
                     89: }
                     90:
                     91: struct object Kplugin_pop(struct operandStack *operandstack)
                     92: {
                     93:   if ((operandstack->sp) <= 0) {
                     94:     return( Kplugin_NullObject );
                     95:   }else{
                     96:     return( (operandstack->ostack)[--(operandstack->sp)]);
                     97:   }
                     98: }
                     99:
                    100: struct object Kplugin_peek(int k,struct operandStack *operandstack)
                    101: {
                    102:   if (((operandstack->ostack)-k-1) < 0) {
                    103:     return( Kplugin_NullObject );
                    104:   }else{
                    105:     return( (operandstack->ostack)[(operandstack->sp)-k-1]);
                    106:   }
                    107: }
                    108:
                    109:
                    110: static void errorSample(char *s) {
                    111:   fprintf(stderr,"Error in plugin/sample: %s\n");
                    112:   /* or push error message in the sharedStack. */
                    113: }
                    114:
                    115: