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pic.c
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pic.c
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#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<stdbool.h>
#include<sys/time.h>
#include<sys/types.h>
#define TEXT_SIZE 256
#define FUNCTION_MAX_COUNT 256
#define TYPE_COUNT 2
#define STRING_TYPE 1
#define INT_TYPE 2
typedef struct TypeStructure Type;
typedef struct ObjectStructure Object;
typedef struct FunctionStructure Function;
struct TypeStructure {
int typeId;
char name[TEXT_SIZE];
Function* functions[FUNCTION_MAX_COUNT];
};
struct ObjectStructure {
int typeId;
char sValue[TEXT_SIZE];
int iValue;
};
struct FunctionStructure {
char name[TEXT_SIZE];
Object* (*impl)(Object*);
};
Type types[TYPE_COUNT];
void reportOutOfMemoryAndExit() {
fprintf(stderr, "Out of memory, bye!");
exit(1);
};
void reportFunctionNotFound(char* fn) {
fprintf(stderr, "Could not find function %s, bye!", fn);
exit(1);
};
Object* allocateNewInt(int v) {
Object* newInt = (Object*)malloc(sizeof(Object));
if (newInt == NULL) {
reportOutOfMemoryAndExit();
}
newInt->iValue = v;
newInt->typeId = INT_TYPE;
return newInt;
};
Object* allocateNewString(char* text) {
Object* newString = (Object*)malloc(sizeof(Object));
if (newString == NULL) {
reportOutOfMemoryAndExit();
}
strcpy(newString->sValue, text);
newString->typeId = STRING_TYPE;
return newString;
};
Object* printInt(Object* i) {
printf("%d",i->iValue);
return NULL;
}
Object* printString(Object* s) {
printf("%s", s->sValue);
return NULL;
}
Function* createFunction(char* n, Object*(*f)(Object*)) {
Function* newFunction = (Function*)malloc(sizeof(Function));
if (newFunction == NULL) {
reportOutOfMemoryAndExit();
}
strcpy(newFunction->name, n);
newFunction->impl = f;
return newFunction;
}
typedef Object*(*o2o)(Object*);
o2o lookupCalee(Object* o, char* fn) {
for (int i=0;i<TYPE_COUNT;i++) {
if (types[i].typeId == o->typeId) {
//printf("type found at position %d: %s\n", i, types[i].name);
for (int j=0; j<FUNCTION_MAX_COUNT; j++) {
if (types[i].functions[j] != NULL && !strcmp(fn, types[i].functions[j]->name)) {
// printf("function found at position %d\n", j);
return types[i].functions[j]->impl;
}
}
}
}
return NULL;
}
// "call site"
Object* invokeFunction(Object* o, char* fn) {
Object*(*calee)(Object*) = lookupCalee(o, fn);
if (calee != NULL) {
calee(o);
} else {
reportFunctionNotFound(fn);
}
}
int main(int argc, char** argv) {
// init functions:
Function* printStringFunction = createFunction("print", printString);
Function* printIntFunction = createFunction("print", printInt);
// init types
Type stringType, intType;
stringType.typeId = STRING_TYPE;
strcpy(stringType.name, "String");
memset(stringType.functions, 0, sizeof(stringType.functions));
stringType.functions[100] = printStringFunction;
intType.typeId = INT_TYPE;
strcpy(intType.name, "Int");
memset(intType.functions, 0, sizeof(intType.functions));
intType.functions[124] = printIntFunction;
types[0] = intType;
types[1] = stringType;
// START
struct timeval tval_before, tval_after, tval_result;
gettimeofday(&tval_before, NULL);
// var s = "FIT";
Object *s = allocateNewString("FIT");
// var i = 42;
Object* i = allocateNewInt(42);
Object* o = s;
Object* next = i;
for(int i=0; i<2000000;i++) {
if (!(rand() % 100)) { // o <-> next
Object* x = o;
o = next;
next = x;
}
// o.print();
invokeFunction(o, "print");
}
// END
gettimeofday(&tval_after, NULL);
timersub(&tval_after, &tval_before, &tval_result);
printf("\n\nTime elapsed: %ld.%06ld\n", (long int)tval_result.tv_sec, (long int)tval_result.tv_usec);
return 0;
};