| 1 | //
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
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| 3 | //
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| 4 | // The contents of this file are covered under the licence agreement in the
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| 5 | // file "LICENCE" distributed with Cforall.
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| 6 | //
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| 7 | // exception.cfa -- Exceptions in a concurrent environment.
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| 8 | //
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| 9 | // Author : Andrew Beach
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| 10 | // Created On : Mon Aug 17 10:41:00 2020
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| 11 | // Last Modified By : Andrew Beach
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| 12 | // Last Modified On : Tue Aug 25 14:41:00 2020
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| 13 | // Update Count : 0
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| 14 | //
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| 15 |
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| 16 | extern "C" {
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| 17 | // use this define to make unwind.h play nice, definitely a hack
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| 18 | #define HIDE_EXPORTS
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| 19 | #include <unwind.h>
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| 20 | #undef HIDE_EXPORTS
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| 21 | }
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| 22 |
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| 23 | #include "invoke.h"
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| 24 | #include "exception.hfa"
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| 25 | #include "coroutine.hfa"
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| 26 |
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| 27 | extern struct $thread * mainThread;
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| 28 |
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| 29 | // Common pattern for all the stop functions, wait until the end then act.
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| 30 | #define STOP_AT_END_FUNCTION(NAME, ...) \
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| 31 | static _Unwind_Reason_Code NAME( \
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| 32 | int version, \
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| 33 | _Unwind_Action actions, \
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| 34 | _Unwind_Exception_Class exception_class, \
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| 35 | struct _Unwind_Exception * unwind_exception, \
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| 36 | struct _Unwind_Context * unwind_context, \
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| 37 | void * stop_param) { \
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| 38 | verify(actions & _UA_CLEANUP_PHASE); \
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| 39 | verify(actions & _UA_FORCE_UNWIND); \
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| 40 | verify(!(actions & _UA_SEARCH_PHASE)); \
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| 41 | verify(!(actions & _UA_HANDLER_FRAME)); \
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| 42 | if ( actions & _UA_END_OF_STACK ) { \
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| 43 | __VA_ARGS__ \
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| 44 | } else { \
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| 45 | return _URC_NO_REASON; \
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| 46 | } \
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| 47 | }
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| 48 |
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| 49 | STOP_AT_END_FUNCTION(main_cancelstop,
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| 50 | abort();
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| 51 | )
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| 52 |
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| 53 | STOP_AT_END_FUNCTION(thread_cancelstop,
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| 54 | // TODO: Instead pass information to the joiner.
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| 55 | abort();
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| 56 | )
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| 57 |
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| 58 | STOP_AT_END_FUNCTION(coroutine_cancelstop,
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| 59 | struct $coroutine * src = ($coroutine *)stop_param;
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| 60 | struct $coroutine * dst = src->last;
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| 61 |
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| 62 | $ctx_switch( src, dst );
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| 63 | abort();
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| 64 | )
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| 65 |
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| 66 | extern "C" {
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| 67 |
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| 68 | struct exception_context_t * this_exception_context(void) {
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| 69 | return &__get_stack( active_coroutine() )->exception_context;
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| 70 | }
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| 71 |
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| 72 | _Unwind_Reason_Code __cfaehm_cancellation_unwind( struct _Unwind_Exception * unwind_exception ) {
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| 73 | _Unwind_Stop_Fn stop_func;
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| 74 | void * stop_param;
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| 75 |
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| 76 | struct $thread * this_thread = TL_GET( this_thread );
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| 77 | if ( &this_thread->self_cor != this_thread->curr_cor ) {
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| 78 | struct $coroutine * cor = this_thread->curr_cor;
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| 79 | cor->cancellation = unwind_exception;
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| 80 |
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| 81 | stop_func = coroutine_cancelstop;
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| 82 | stop_param = cor;
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| 83 | } else if ( mainThread == this_thread ) {
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| 84 | stop_func = main_cancelstop;
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| 85 | stop_param = (void *)0x22;
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| 86 | } else {
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| 87 | stop_func = thread_cancelstop;
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| 88 | stop_param = this_thread;
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| 89 | }
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| 90 |
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| 91 | return _Unwind_ForcedUnwind( unwind_exception, stop_func, stop_param );
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| 92 | }
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| 93 |
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| 94 | }
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