98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/*
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* Thread support.
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*/
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#include "third_party/duktape/duk_internal.h"
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DUK_INTERNAL void duk_hthread_terminate(duk_hthread *thr) {
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DUK_ASSERT(thr != NULL);
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while (thr->callstack_curr != NULL) {
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duk_hthread_activation_unwind_norz(thr);
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}
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thr->valstack_bottom = thr->valstack;
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duk_set_top(thr, 0); /* unwinds valstack, updating refcounts */
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thr->state = DUK_HTHREAD_STATE_TERMINATED;
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/* Here we could remove references to built-ins, but it may not be
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* worth the effort because built-ins are quite likely to be shared
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* with another (unterminated) thread, and terminated threads are also
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* usually garbage collected quite quickly.
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*
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* We could also shrink the value stack here, but that also may not
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* be worth the effort for the same reason.
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*/
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DUK_REFZERO_CHECK_SLOW(thr);
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}
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#if defined(DUK_USE_DEBUGGER_SUPPORT)
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DUK_INTERNAL duk_uint_fast32_t duk_hthread_get_act_curr_pc(duk_hthread *thr, duk_activation *act) {
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duk_instr_t *bcode;
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DUK_ASSERT(thr != NULL);
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DUK_ASSERT(act != NULL);
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DUK_UNREF(thr);
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/* XXX: store 'bcode' pointer to activation for faster lookup? */
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if (act->func && DUK_HOBJECT_IS_COMPFUNC(act->func)) {
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bcode = DUK_HCOMPFUNC_GET_CODE_BASE(thr->heap, (duk_hcompfunc *) (act->func));
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return (duk_uint_fast32_t) (act->curr_pc - bcode);
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}
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return 0;
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}
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#endif /* DUK_USE_DEBUGGER_SUPPORT */
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DUK_INTERNAL duk_uint_fast32_t duk_hthread_get_act_prev_pc(duk_hthread *thr, duk_activation *act) {
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duk_instr_t *bcode;
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duk_uint_fast32_t ret;
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DUK_ASSERT(thr != NULL);
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DUK_ASSERT(act != NULL);
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DUK_UNREF(thr);
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if (act->func && DUK_HOBJECT_IS_COMPFUNC(act->func)) {
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bcode = DUK_HCOMPFUNC_GET_CODE_BASE(thr->heap, (duk_hcompfunc *) (act->func));
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ret = (duk_uint_fast32_t) (act->curr_pc - bcode);
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if (ret > 0) {
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ret--;
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}
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return ret;
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}
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return 0;
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}
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/* Write bytecode executor's curr_pc back to topmost activation (if any). */
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DUK_INTERNAL void duk_hthread_sync_currpc(duk_hthread *thr) {
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duk_activation *act;
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DUK_ASSERT(thr != NULL);
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if (thr->ptr_curr_pc != NULL) {
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/* ptr_curr_pc != NULL only when bytecode executor is active. */
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DUK_ASSERT(thr->callstack_top > 0);
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DUK_ASSERT(thr->callstack_curr != NULL);
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act = thr->callstack_curr;
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DUK_ASSERT(act != NULL);
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act->curr_pc = *thr->ptr_curr_pc;
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}
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}
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DUK_INTERNAL void duk_hthread_sync_and_null_currpc(duk_hthread *thr) {
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duk_activation *act;
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DUK_ASSERT(thr != NULL);
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if (thr->ptr_curr_pc != NULL) {
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/* ptr_curr_pc != NULL only when bytecode executor is active. */
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DUK_ASSERT(thr->callstack_top > 0);
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DUK_ASSERT(thr->callstack_curr != NULL);
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act = thr->callstack_curr;
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DUK_ASSERT(act != NULL);
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act->curr_pc = *thr->ptr_curr_pc;
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thr->ptr_curr_pc = NULL;
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}
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}
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