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Variables capturing.

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antirez 2022-12-20 14:10:45 +01:00
parent 260d379cd5
commit fd274cad34
1 changed files with 41 additions and 5 deletions
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46
aocla.c
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@ -308,6 +308,26 @@ obj *newInt(int i) {
return o;
}
/* Deep copy the passed object. Return an object with refcount = 1. */
obj *deepCopy(obj *o) {
if (o == NULL) return NULL;
/* TODO: actually implement it. */
printf("IMPLEMENT ME \\o/\n");
exit(1);
}
/* This function performs a deep copy of the object if it has a refcount > 1.
* The copy is returned. Otherwise if refcount is 1, the function returns
* the same object we passed as argument. This is useful when we want to
* modify a shared object. */
obj *getUnsharedObject(obj *o) {
if (o->refcount > 1) {
return deepCopy(o);
} else {
return o;
}
}
/* ========================== Interpreter state ============================= */
/* Set the syntax or runtime error, if the context is not NULL. */
@ -329,8 +349,7 @@ stackframe *newStackFrame(void) {
/* Free a stack frame. */
void freeStackFrame(stackframe *sf) {
for (int j = 0; j < AOCLA_NUMVARS; j++)
if (sf->locals[j]) release(sf->locals[j]);
for (int j = 0; j < AOCLA_NUMVARS; j++) release(sf->locals[j]);
free(sf);
}
@ -403,10 +422,25 @@ int eval(aoclactx *ctx, obj *l) {
aproc *proc;
switch(o->type) {
case OBJ_TYPE_SYMBOL:
case OBJ_TYPE_TUPLE: /* Capture variables. */
if (ctx->stacklen < o->l.len) {
setError(ctx,NULL,"Out of stack while capturing locals");
return 1;
}
ctx->stacklen -= o->l.len;
for (size_t i = 0; i < o->l.len; i++) {
int idx = o->l.ele[i]->str.ptr[0] - 'a';
release(ctx->frame->locals[idx]);
ctx->frame->locals[idx] =
ctx->stack[ctx->stacklen - o->l.len];
}
break;
case OBJ_TYPE_SYMBOL: /* Execute procedure. */
proc = lookupProc(ctx,o->str.ptr);
if (proc == NULL) {
setError(ctx,o->str.ptr,"Symbol not bound to procedure");
setError(ctx,o->str.ptr,
"Symbol not bound to procedure");
return 1;
}
if (proc->cproc) {
@ -545,8 +579,10 @@ int procCompare(const char *fname, aoclactx *ctx) {
int procSortList(const char *fname, aoclactx *ctx) {
NOTUSED(fname);
if (checkStackType(ctx,1,OBJ_TYPE_LIST)) return 1;
obj *l = stackPeek(ctx);
obj *l = stackPop(ctx);
l = getUnsharedObject(l);
qsort(l->l.ele,l->l.len,sizeof(obj*),qsort_obj_cmp);
stackPush(ctx,l);
return 0;
}