Changeset 2922871


Ignore:
Timestamp:
May 11, 2020, 2:22:07 PM (17 months ago)
Author:
Andrew Beach <ajbeach@…>
Branches:
arm-eh, jacob/cs343-translation, master, new-ast, new-ast-unique-expr
Children:
fe1025d
Parents:
a7b486b
Message:

Divided termination code in the exception library so it has memory management and cancellation sections.

File:
1 edited

Legend:

Unmodified
Added
Removed
  • libcfa/src/exception.c

    ra7b486b r2922871  
    121121
    122122
    123 // TERMINATION ===============================================================
    124 
    125 // MEMORY MANAGEMENT (still for integers)
    126 // May have to move to cfa for constructors and destructors (references).
     123// MEMORY MANAGEMENT =========================================================
    127124
    128125// How to clean up an exception in various situations.
     
    203200}
    204201
    205 // If this isn't a rethrow (*except==0), delete the provided exception.
    206 void __cfaehm_cleanup_terminate( void * except ) {
    207         if ( *(void**)except ) __cfaehm_delete_exception( *(exception_t **)except );
    208 }
     202// CANCELLATION ==============================================================
    209203
    210204// Function needed by force unwind
     
    228222}
    229223
     224// Cancel the current stack, prefroming approprate clean-up and messaging.
     225static __attribute__((noreturn)) void __cfaehm_cancel_stack(
     226                exception_t * exception ) {
     227        // TODO: Detect current stack and pick a particular stop-function.
     228        _Unwind_Reason_Code ret;
     229        ret = _Unwind_ForcedUnwind( &this_exception_storage, _Stop_Fn, (void*)0x22 );
     230        printf("UNWIND ERROR %d after force unwind\n", ret);
     231        abort();
     232}
     233
     234
     235// TERMINATION ===============================================================
     236
     237// If this isn't a rethrow (*except==0), delete the provided exception.
     238void __cfaehm_cleanup_terminate( void * except ) {
     239        if ( *(void**)except ) __cfaehm_delete_exception( *(exception_t **)except );
     240}
     241
    230242// The exception that is being thrown must already be stored.
    231243static __attribute__((noreturn)) void __cfaehm_begin_unwind(void) {
     
    245257        // the whole stack.
    246258
     259        // No handler found, go to the default operation.
     260        // Currently this will always be a cancellation.
    247261        if ( ret == _URC_END_OF_STACK ) {
    248                 // No proper handler was found. This can be handled in many ways, C++ calls std::terminate.
    249                 // Here we force unwind the stack, basically raising a cancellation.
    250                 printf("Uncaught exception %p\n", &this_exception_storage);
    251 
    252                 ret = _Unwind_ForcedUnwind( &this_exception_storage, _Stop_Fn, (void*)0x22 );
    253                 printf("UNWIND ERROR %d after force unwind\n", ret);
    254                 abort();
     262                __cfadbg_print_safe(exception, "Uncaught exception %p\n", &this_exception_storage);
     263
     264                __cfaehm_cancel_stack(this_exception_context()->current_exception);
    255265        }
    256266
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