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                 /* Guard the safepoint, which will clear faulting_p if unwind-native-frames
  77                 succeeds */
  78                 code->guard_safepoint();
  79                 unwind_native_frames(special_objects[ERROR_HANDLER_QUOT],
  80                         ctx->callstack_top);
  81         }
  82         /* Error was thrown in early startup before error handler is set, just
  83         crash. */
  84         else
  85         {
  86                 std::cout << "You have triggered a bug in Factor. Please report.\n";
  87                 std::cout << "error: " << error << std::endl;
  88                 std::cout << "arg 1: "; print_obj(arg1); std::cout << std::endl;
  89                 std::cout << "arg 2: "; print_obj(arg2); std::cout << std::endl;
  90                 factorbug();
  91                 abort();
  92         }
  93 }
  94
  95 void factor_vm::type_error(cell type, cell tagged)
  96 {
  97         general_error(ERROR_TYPE,tag_fixnum(type),tagged);
  98 }
  99
 100 void factor_vm::not_implemented_error()
 101 {
 102         general_error(ERROR_NOT_IMPLEMENTED,false_object,false_object);
 103 }
 104
 105 void factor_vm::verify_memory_protection_error(cell addr)
 106 {
 107         /* Called from the OS-specific top halves of the signal handlers to
 108         make sure it's safe to dispatch to memory_protection_error */
 109         if(fatal_erroring_p)
 110                 fa_diddly_atal_error();
 111         if(faulting_p && !code->safepoint_p(addr))
 112                 fatal_error("Double fault", addr);
 113         else if(fep_p)
 114                 fatal_error("Memory protection fault during low-level debugger", addr);
 115         else if(atomic::load(&current_gc_p))
 116                 fatal_error("Memory protection fault during gc", addr);
 117 }
 118
 119 void factor_vm::memory_protection_error(cell addr)
 120 {
 121         if(code->safepoint_p(addr))
 122                 safepoint.handle_safepoint(this);
 123         else if(ctx->datastack_seg->underflow_p(addr))
 124                 general_error(ERROR_DATASTACK_UNDERFLOW,false_object,false_object);
 125         else if(ctx->datastack_seg->overflow_p(addr))
 126                 general_error(ERROR_DATASTACK_OVERFLOW,false_object,false_object);
 127         else if(ctx->retainstack_seg->underflow_p(addr))
 128                 general_error(ERROR_RETAINSTACK_UNDERFLOW,false_object,false_object);
 129         else if(ctx->retainstack_seg->overflow_p(addr))
 130                 general_error(ERROR_RETAINSTACK_OVERFLOW,false_object,false_object);
 131         else if(ctx->callstack_seg->underflow_p(addr))
 132                 general_error(ERROR_CALLSTACK_OVERFLOW,false_object,false_object);
 133         else if(ctx->callstack_seg->overflow_p(addr))
 134                 general_error(ERROR_CALLSTACK_UNDERFLOW,false_object,false_object);
 135         else
 136                 general_error(ERROR_MEMORY,from_unsigned_cell(addr),false_object);
 137 }
 138
 139 void factor_vm::signal_error(cell signal)
 140 {
 141         general_error(ERROR_SIGNAL,from_unsigned_cell(signal),false_object);
 142 }
 143
 144 void factor_vm::divide_by_zero_error()
 145 {
 146         general_error(ERROR_DIVIDE_BY_ZERO,false_object,false_object);
 147 }
 148
 149 void factor_vm::fp_trap_error(unsigned int fpu_status)
 150 {
 151         general_error(ERROR_FP_TRAP,tag_fixnum(fpu_status),false_object);
 152 }
 153
 154 /* For testing purposes */
 155 void factor_vm::primitive_unimplemented()
 156 {
 157         not_implemented_error();
 158 }
 159
 160 void factor_vm::memory_signal_handler_impl()
 161 {
 162         memory_protection_error(signal_fault_addr);
 163         if (!signal_resumable)
 164         {
 165                 /* In theory we should only get here if the callstack overflowed during a
 166                 safepoint */
 167                 general_error(ERROR_CALLSTACK_OVERFLOW,false_object,false_object);
 168         }
 169 }
 170
 171 void memory_signal_handler_impl()
 172 {
 173         current_vm()->memory_signal_handler_impl();
 174 }
 175
 176 void factor_vm::synchronous_signal_handler_impl()
 177 {
 178         signal_error(signal_number);
 179 }
 180
 181 void synchronous_signal_handler_impl()
 182 {
 183         current_vm()->synchronous_signal_handler_impl();
 184 }
 185
 186 void factor_vm::fp_signal_handler_impl()
 187 {
 188         /* Clear pending exceptions to avoid getting stuck in a loop */
 189         set_fpu_state(get_fpu_state());
 190
 191         fp_trap_error(signal_fpu_status);
 192 }
 193
 194 void fp_signal_handler_impl()
 195 {
 196         current_vm()->fp_signal_handler_impl();
 197 }
 198 }