Return to sample.c CVS log

Up to [local] / OpenXM / src / kan96xx / plugin

Annotation of OpenXM/src/kan96xx/plugin/sample.c, Revision 1.1.1.1

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: