vm/errors.cpp

   1 #include "master.hpp"
   2
   3 namespace factor
   4 {
   5
   6 bool factor_vm::fatal_erroring_p;
   7
   8 static inline void fa_diddly_atal_error()
   9 {
  10         printf("fatal_error in fatal_error!\n");
  11         breakpoint();
  12         exit(86);
  13 }
  14
  15 void fatal_error(const char *msg, cell tagged)
  16 {
  17         if (factor_vm::fatal_erroring_p)
  18                 fa_diddly_atal_error();
  19
  20         factor_vm::fatal_erroring_p = true;
  21
  22         std::cout << "fatal_error: " << msg;
  23         std::cout << ": " << (void*)tagged;
  24         std::cout << std::endl;
  25         abort();
  26 }
  27
  28 void critical_error(const char *msg, cell tagged)
  29 {
  30         std::cout << "You have triggered a bug in Factor. Please report.\n";
  31         std::cout << "critical_error: " << msg;
  32         std::cout << ": " << std::hex << tagged << std::dec;
  33         std::cout << std::endl;
  34         current_vm()->factorbug();
  35 }
  36
  37 void out_of_memory()
  38 {
  39         std::cout << "Out of memory\n\n";
  40         current_vm()->dump_generations();
  41         exit(1);
  42 }
  43
  44 void factor_vm::general_error(vm_error_type error, cell arg1, cell arg2)
  45 {
  46         faulting_p = true;
  47
  48         /* Reset local roots before allocating anything */
  49         data_roots.clear();
  50         bignum_roots.clear();
  51         code_roots.clear();
  52
  53         /* If we had an underflow or overflow, data or retain stack
  54         pointers might be out of bounds, so fix them before allocating
  55         anything */
  56         ctx->fix_stacks();
  57
  58         /* If error was thrown during heap scan, we re-enable the GC */
  59         gc_off = false;
  60
  61         /* If the error handler is set, we rewind any C stack frames and
  62         pass the error to user-space. */
  63         if(!current_gc && to_boolean(special_objects[ERROR_HANDLER_QUOT]))
  64         {
  65 #ifdef FACTOR_DEBUG
  66                 /* Doing a GC here triggers all kinds of funny errors */
  67                 primitive_compact_gc();
  68 #endif
  69
  70                 /* Now its safe to allocate and GC */
  71                 cell error_object = allot_array_4(special_objects[OBJ_ERROR],
  72                         tag_fixnum(error),arg1,arg2);
  73
  74                 ctx->push(error_object);
  75
  76                 /* The unwind-native-frames subprimitive will clear faulting_p
  77                 if it was successfully reached. */
  78                 unwind_native_frames(special_objects[ERROR_HANDLER_QUOT],
  79                         ctx->callstack_top);
  80         }
  81         /* Error was thrown in early startup before error handler is set, just
  82         crash. */
  83         else
  84         {
  85                 std::cout << "You have triggered a bug in Factor. Please report.\n";
  86                 std::cout << "error: " << error << std::endl;
  87                 std::cout << "arg 1: "; print_obj(arg1); std::cout << std::endl;
  88                 std::cout << "arg 2: "; print_obj(arg2); std::cout << std::endl;
  89                 factorbug();
  90                 abort();
  91         }
  92 }
  93
  94 void factor_vm::type_error(cell type, cell tagged)
  95 {
  96         general_error(ERROR_TYPE,tag_fixnum(type),tagged);
  97 }
  98
  99 void factor_vm::not_implemented_error()
 100 {
 101         general_error(ERROR_NOT_IMPLEMENTED,false_object,false_object);
 102 }
 103
 104 void factor_vm::verify_memory_protection_error(cell addr)
 105 {
 106         /* Called from the OS-specific top halves of the signal handlers to
 107         make sure it's safe to dispatch to memory_protection_error */
 108         if(fatal_erroring_p)
 109                 fa_diddly_atal_error();
 110         if(faulting_p && !code->safepoint_p(addr))
 111                 fatal_error("Double fault", addr);
 112         else if(fep_p)
 113                 fatal_error("Memory protection fault during low-level debugger", addr);
 114         else if(atomic::load(&current_gc_p))
 115                 fatal_error("Memory protection fault during gc", addr);
 116 }
 117
 118 void factor_vm::memory_protection_error(cell addr)
 119 {
 120         if(code->safepoint_p(addr))
 121                 safepoint.handle_safepoint(this);
 122         else if(ctx->datastack_seg->underflow_p(addr))
 123                 general_error(ERROR_DATASTACK_UNDERFLOW,false_object,false_object);
 124         else if(ctx->datastack_seg->overflow_p(addr))
 125                 general_error(ERROR_DATASTACK_OVERFLOW,false_object,false_object);
 126         else if(ctx->retainstack_seg->underflow_p(addr))
 127                 general_error(ERROR_RETAINSTACK_UNDERFLOW,false_object,false_object);
 128         else if(ctx->retainstack_seg->overflow_p(addr))
 129                 general_error(ERROR_RETAINSTACK_OVERFLOW,false_object,false_object);
 130         else if(ctx->callstack_seg->underflow_p(addr))
 131                 general_error(ERROR_CALLSTACK_OVERFLOW,false_object,false_object);
 132         else if(ctx->callstack_seg->overflow_p(addr))
 133                 general_error(ERROR_CALLSTACK_UNDERFLOW,false_object,false_object);
 134         else
 135                 general_error(ERROR_MEMORY,from_unsigned_cell(addr),false_object);
 136 }
 137
 138 void factor_vm::signal_error(cell signal)
 139 {
 140         general_error(ERROR_SIGNAL,from_unsigned_cell(signal),false_object);
 141 }
 142
 143 void factor_vm::divide_by_zero_error()
 144 {
 145         general_error(ERROR_DIVIDE_BY_ZERO,false_object,false_object);
 146 }
 147
 148 void factor_vm::fp_trap_error(unsigned int fpu_status)
 149 {
 150         general_error(ERROR_FP_TRAP,tag_fixnum(fpu_status),false_object);
 151 }
 152
 153 /* For testing purposes */
 154 void factor_vm::primitive_unimplemented()
 155 {
 156         not_implemented_error();
 157 }
 158
 159 void factor_vm::memory_signal_handler_impl()
 160 {
 161         memory_protection_error(signal_fault_addr);
 162         if (!signal_resumable)
 163         {
 164                 /* In theory we should only get here if the callstack overflowed during a
 165                 safepoint */
 166                 general_error(ERROR_CALLSTACK_OVERFLOW,false_object,false_object);
 167         }
 168 }
 169
 170 void memory_signal_handler_impl()
 171 {
 172         current_vm()->memory_signal_handler_impl();
 173 }
 174
 175 void factor_vm::synchronous_signal_handler_impl()
 176 {
 177         signal_error(signal_number);
 178 }
 179
 180 void synchronous_signal_handler_impl()
 181 {
 182         current_vm()->synchronous_signal_handler_impl();
 183 }
 184
 185 void factor_vm::fp_signal_handler_impl()
 186 {
 187         /* Clear pending exceptions to avoid getting stuck in a loop */
 188         set_fpu_state(get_fpu_state());
 189
 190         fp_trap_error(signal_fpu_status);
 191 }
 192
 193 void fp_signal_handler_impl()
 194 {
 195         current_vm()->fp_signal_handler_impl();
 196 }
 197 }