Idris2/support/refc/memoryManagement.c

#include "runtime.h"

Value *newValue()
{
    Value *retVal = (Value *)malloc(sizeof(Value));
    retVal->header.refCounter = 1;
    retVal->header.tag = NO_TAG;
    return retVal;
}

Value_Arglist *newArglist(int missing, int total)
{
    Value_Arglist *retVal = (Value_Arglist *)newValue();
    retVal->header.tag = ARGLIST_TAG;
    retVal->total = total;
    retVal->filled = total - missing;
    retVal->args = (Value **)malloc(sizeof(Value *) * total);
    memset(retVal->args, 0, sizeof(Value *) * total);
    return retVal;
}

Value_Constructor *newConstructor(int total, int tag, const char *name)
{
    Value_Constructor *retVal = (Value_Constructor *)newValue();
    retVal->header.tag = CONSTRUCTOR_TAG;
    retVal->total = total;
    retVal->tag = tag;
    int nameLength = strlen(name);
    retVal->name = malloc(nameLength + 1);
    memset(retVal->name, 0, nameLength + 1);
    memcpy(retVal->name, name, nameLength);
    retVal->args = (Value **)malloc(sizeof(Value *) * total);
    return retVal;
}

Value_Closure *makeClosureFromArglist(fun_ptr_t f, Value_Arglist *arglist)
{
    Value_Closure *retVal = (Value_Closure *)newValue();
    retVal->header.tag = CLOSURE_TAG;
    retVal->arglist = arglist; // (Value_Arglist *)newReference((Value*)arglist);
    retVal->f = f;
    if (retVal->arglist->filled >= retVal->arglist->total)
    {
        retVal->header.tag = COMPLETE_CLOSURE_TAG;
    }
    return retVal;
}

Value_Double *makeDouble(double d)
{
    Value_Double *retVal = (Value_Double *)newValue();
    retVal->header.tag = DOUBLE_TAG;
    retVal->d = d;
    return retVal;
}

Value_Char *makeChar(char c)
{
    Value_Char *retVal = (Value_Char *)newValue();
    retVal->header.tag = CHAR_TAG;
    retVal->c = c;
    return retVal;
}

Value_Int8 *makeInt8(int8_t i)
{
    Value_Int8 *retVal = (Value_Int8 *)newValue();
    retVal->header.tag = INT8_TAG;
    retVal->i8 = i;
    return retVal;
}

Value_Int16 *makeInt16(int16_t i)
{
    Value_Int16 *retVal = (Value_Int16 *)newValue();
    retVal->header.tag = INT16_TAG;
    retVal->i16 = i;
    return retVal;
}

Value_Int32 *makeInt32(int32_t i)
{
    Value_Int32 *retVal = (Value_Int32 *)newValue();
    retVal->header.tag = INT32_TAG;
    retVal->i32 = i;
    return retVal;
}

Value_Int64 *makeInt64(int64_t i)
{
    Value_Int64 *retVal = (Value_Int64 *)newValue();
    retVal->header.tag = INT64_TAG;
    retVal->i64 = i;
    return retVal;
}

Value_String *makeEmptyString(size_t l)
{
    Value_String *retVal = (Value_String *)newValue();
    retVal->header.tag = STRING_TAG;
    retVal->str = malloc(l);
    memset(retVal->str, 0, l);
    return retVal;
}

Value_String *makeString(char *s)
{
    Value_String *retVal = (Value_String *)newValue();
    int l = strlen(s);
    retVal->header.tag = STRING_TAG;
    retVal->str = malloc(l + 1);
    memset(retVal->str, 0, l + 1);
    memcpy(retVal->str, s, l);
    return retVal;
}

Value_Pointer *makePointer(void *ptr_Raw)
{
    Value_Pointer *p = (Value_Pointer *)newValue();
    p->header.tag = POINTER_TAG;
    p->p = ptr_Raw;
    return p;
}

Value_GCPointer *makeGCPointer(void *ptr_Raw, Value_Closure *onCollectFct)
{
    Value_GCPointer *p = (Value_GCPointer *)newValue();
    p->header.tag = GC_POINTER_TAG;
    p->p = makePointer(ptr_Raw);
    p->onCollectFct = onCollectFct;
    return p;
}

Value_Buffer *makeBuffer(void *buf)
{
    Value_Buffer *b = (Value_Buffer *)newValue();
    b->header.tag = BUFFER_TAG;
    b->buffer = buf;
    return b;
}

Value_Array *makeArray(int length)
{
    Value_Array *a = (Value_Array *)newValue();
    a->header.tag = ARRAY_TAG;
    a->capacity = length;
    a->arr = (Value **)malloc(sizeof(Value *) * length);
    memset(a->arr, 0, sizeof(Value *) * length);
    return a;
}

Value_World *makeWorld()
{
    Value_World *retVal = (Value_World *)newValue();
    retVal->header.tag = WORLD_TAG;
    retVal->listIORefs = NULL;
    return retVal;
}

Value *newReference(Value *source)
{
    // note that we explicitly allow NULL as source (for erased arguments)
    if (source)
    {
        source->header.refCounter++;
    }
    return source;
}

void removeReference(Value *elem)
{
    if (!elem)
    {
        return;
    }
    // remove reference counter
    elem->header.refCounter--;
    if (elem->header.refCounter == 0)
    // recursively remove all references to all children
    {
        switch (elem->header.tag)
        {
        case INT32_TAG:
            /* nothing to delete, added for sake of completeness */
            break;
        case INT64_TAG:
            /* nothing to delete, added for sake of completeness */
            break;
        case DOUBLE_TAG:
            /* nothing to delete, added for sake of completeness */
            break;
        case CHAR_TAG:
            /* nothing to delete, added for sake of completeness */
            break;
        case STRING_TAG:
            free(((Value_String *)elem)->str);
            break;

        case CLOSURE_TAG:
        {
            Value_Closure *cl = (Value_Closure *)elem;
            Value_Arglist *al = cl->arglist;
            removeReference((Value *)al);
            break;
        }
        case COMPLETE_CLOSURE_TAG:
        {
            Value_Closure *cl = (Value_Closure *)elem;
            Value_Arglist *al = cl->arglist;
            removeReference((Value *)al);
            break;
        }
        case ARGLIST_TAG:
        {
            Value_Arglist *al = (Value_Arglist *)elem;
            for (int i = 0; i < al->filled; i++)
            {
                removeReference(al->args[i]);
            }
            free(al->args);
            break;
        }
        case CONSTRUCTOR_TAG:
        {
            Value_Constructor *constr = (Value_Constructor *)elem;
            for (int i = 0; i < constr->total; i++)
            {
                removeReference(constr->args[i]);
            }
            if (constr->name)
            {
                free(constr->name);
            }
            free(constr->args);
            break;
        }
        case IOREF_TAG:
            /* nothing to delete, added for sake of completeness */
            break;

        case ARRAY_TAG:
        {
            Value_Array *a = (Value_Array *)elem;
            for (int i = 0; i < a->capacity; i++)
            {
                removeReference(a->arr[i]);
            }
            free(a->arr);
            break;
        }
        case POINTER_TAG:
            /* nothing to delete, added for sake of completeness */
            break;

        case GC_POINTER_TAG:
        {
            /* maybe here we need to invoke onCollectAny */
            Value_GCPointer *vPtr = (Value_GCPointer *)elem;
            Value *closure1 = apply_closure((Value *)vPtr->onCollectFct, (Value *)vPtr->p);
            apply_closure(closure1, NULL);
            removeReference(closure1);
            removeReference((Value *)vPtr->onCollectFct);
            removeReference((Value *)vPtr->p);
            break;
        }
        case WORLD_TAG:
        {
            Value_World *w = (Value_World *)elem;
            if (w->listIORefs)
            {
                for (int i = 0; i < w->listIORefs->filled; i++)
                {
                    removeReference(w->listIORefs->refs[i]);
                }
                free(w->listIORefs->refs);
                free(w->listIORefs);
            }
        }
        default:
            break;
        }
        // finally, free element
        free(elem);
    }
}