projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | /* |
| 2 | * Thread support. | |
| 3 | */ | |
| 4 | ||
| 5 | #include "duk_internal.h" | |
| 6 | ||
| 7 | DUK_INTERNAL void duk_hthread_terminate(duk_hthread *thr) { | |
| 8 | DUK_ASSERT(thr != NULL); | |
| 9 | ||
| 10 | /* Order of unwinding is important */ | |
| 11 | ||
| 12 | duk_hthread_catchstack_unwind(thr, 0); | |
| 13 | ||
| 14 | duk_hthread_callstack_unwind(thr, 0); /* side effects, possibly errors */ | |
| 15 | ||
| 16 | thr->valstack_bottom = thr->valstack; | |
| 17 | duk_set_top((duk_context *) thr, 0); /* unwinds valstack, updating refcounts */ | |
| 18 | ||
| 19 | thr->state = DUK_HTHREAD_STATE_TERMINATED; | |
| 20 | ||
| 21 | /* Here we could remove references to built-ins, but it may not be | |
| 22 | * worth the effort because built-ins are quite likely to be shared | |
| 23 | * with another (unterminated) thread, and terminated threads are also | |
| 24 | * usually garbage collected quite quickly. Also, doing DECREFs | |
| 25 | * could trigger finalization, which would run on the current thread | |
| 26 | * and have access to only some of the built-ins. Garbage collection | |
| 27 | * deals with this correctly already. | |
| 28 | */ | |
| 29 | ||
| 30 | /* XXX: Shrink the stacks to minimize memory usage? May not | |
| 31 | * be worth the effort because terminated threads are usually | |
| 32 | * garbage collected quite soon. | |
| 33 | */ | |
| 34 | } | |
| 35 | ||
| 36 | DUK_INTERNAL duk_activation *duk_hthread_get_current_activation(duk_hthread *thr) { | |
| 37 | DUK_ASSERT(thr != NULL); | |
| 38 | ||
| 39 | if (thr->callstack_top > 0) { | |
| 40 | return thr->callstack + thr->callstack_top - 1; | |
| 41 | } else { | |
| 42 | return NULL; | |
| 43 | } | |
| 44 | } | |
| 45 | ||
| 46 | #if defined(DUK_USE_DEBUGGER_SUPPORT) | |
| 47 | DUK_INTERNAL duk_uint_fast32_t duk_hthread_get_act_curr_pc(duk_hthread *thr, duk_activation *act) { | |
| 48 | duk_instr_t *bcode; | |
| 49 | ||
| 50 | DUK_ASSERT(thr != NULL); | |
| 51 | DUK_ASSERT(act != NULL); | |
| 52 | DUK_UNREF(thr); | |
| 53 | ||
| 54 | /* XXX: store 'bcode' pointer to activation for faster lookup? */ | |
| 55 | if (act->func && DUK_HOBJECT_IS_COMPILEDFUNCTION(act->func)) { | |
| 56 | bcode = DUK_HCOMPILEDFUNCTION_GET_CODE_BASE(thr->heap, (duk_hcompiledfunction *) (act->func)); | |
| 57 | return (duk_uint_fast32_t) (act->curr_pc - bcode); | |
| 58 | } | |
| 59 | return 0; | |
| 60 | } | |
| 61 | #endif /* DUK_USE_DEBUGGER_SUPPORT */ | |
| 62 | ||
| 63 | DUK_INTERNAL duk_uint_fast32_t duk_hthread_get_act_prev_pc(duk_hthread *thr, duk_activation *act) { | |
| 64 | duk_instr_t *bcode; | |
| 65 | duk_uint_fast32_t ret; | |
| 66 | ||
| 67 | DUK_ASSERT(thr != NULL); | |
| 68 | DUK_ASSERT(act != NULL); | |
| 69 | DUK_UNREF(thr); | |
| 70 | ||
| 71 | if (act->func && DUK_HOBJECT_IS_COMPILEDFUNCTION(act->func)) { | |
| 72 | bcode = DUK_HCOMPILEDFUNCTION_GET_CODE_BASE(thr->heap, (duk_hcompiledfunction *) (act->func)); | |
| 73 | ret = (duk_uint_fast32_t) (act->curr_pc - bcode); | |
| 74 | if (ret > 0) { | |
| 75 | ret--; | |
| 76 | } | |
| 77 | return ret; | |
| 78 | } | |
| 79 | return 0; | |
| 80 | } | |
| 81 | ||
| 82 | /* Write bytecode executor's curr_pc back to topmost activation (if any). */ | |
| 83 | DUK_INTERNAL void duk_hthread_sync_currpc(duk_hthread *thr) { | |
| 84 | duk_activation *act; | |
| 85 | ||
| 86 | DUK_ASSERT(thr != NULL); | |
| 87 | ||
| 88 | if (thr->ptr_curr_pc != NULL) { | |
| 89 | /* ptr_curr_pc != NULL only when bytecode executor is active. */ | |
| 90 | DUK_ASSERT(thr->callstack_top > 0); | |
| 91 | act = thr->callstack + thr->callstack_top - 1; | |
| 92 | act->curr_pc = *thr->ptr_curr_pc; | |
| 93 | } | |
| 94 | } | |
| 95 | ||
| 96 | DUK_INTERNAL void duk_hthread_sync_and_null_currpc(duk_hthread *thr) { | |
| 97 | duk_activation *act; | |
| 98 | ||
| 99 | DUK_ASSERT(thr != NULL); | |
| 100 | ||
| 101 | if (thr->ptr_curr_pc != NULL) { | |
| 102 | /* ptr_curr_pc != NULL only when bytecode executor is active. */ | |
| 103 | DUK_ASSERT(thr->callstack_top > 0); | |
| 104 | act = thr->callstack + thr->callstack_top - 1; | |
| 105 | act->curr_pc = *thr->ptr_curr_pc; | |
| 106 | thr->ptr_curr_pc = NULL; | |
| 107 | } | |
| 108 | } |