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/*
* duk_hthread allocation and freeing.
*/
#include "duk_internal.h"
/*
* Allocate initial stacks for a thread. Note that 'thr' must be reachable
* as a garbage collection may be triggered by the allocation attempts.
* Returns zero (without leaking memory) if init fails.
*/
DUK_INTERNAL duk_bool_t duk_hthread_init_stacks(duk_heap *heap, duk_hthread *thr) {
duk_size_t alloc_size;
duk_size_t i;
DUK_ASSERT(heap != NULL);
DUK_ASSERT(thr != NULL);
DUK_ASSERT(thr->valstack == NULL);
DUK_ASSERT(thr->valstack_end == NULL);
DUK_ASSERT(thr->valstack_alloc_end == NULL);
DUK_ASSERT(thr->valstack_bottom == NULL);
DUK_ASSERT(thr->valstack_top == NULL);
DUK_ASSERT(thr->callstack_curr == NULL);
/* valstack */
DUK_ASSERT(DUK_VALSTACK_API_ENTRY_MINIMUM <= DUK_VALSTACK_INITIAL_SIZE);
alloc_size = sizeof(duk_tval) * DUK_VALSTACK_INITIAL_SIZE;
thr->valstack = (duk_tval *) DUK_ALLOC(heap, alloc_size);
if (!thr->valstack) {
goto fail;
}
duk_memzero(thr->valstack, alloc_size);
thr->valstack_end = thr->valstack + DUK_VALSTACK_API_ENTRY_MINIMUM;
thr->valstack_alloc_end = thr->valstack + DUK_VALSTACK_INITIAL_SIZE;
thr->valstack_bottom = thr->valstack;
thr->valstack_top = thr->valstack;
for (i = 0; i < DUK_VALSTACK_INITIAL_SIZE; i++) {
DUK_TVAL_SET_UNDEFINED(&thr->valstack[i]);
}
return 1;
fail:
DUK_FREE(heap, thr->valstack);
DUK_ASSERT(thr->callstack_curr == NULL);
thr->valstack = NULL;
return 0;
}
/* For indirect allocs. */
DUK_INTERNAL void *duk_hthread_get_valstack_ptr(duk_heap *heap, void *ud) {
duk_hthread *thr = (duk_hthread *) ud;
DUK_UNREF(heap);
return (void *) thr->valstack;
}
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