vm/errors.cpp

   1 #include "master.hpp"
   2
   3 namespace factor
   4 {
   5
   6 void factor_vm::out_of_memory()
   7 {
   8         print_string("Out of memory\n\n");
   9         dump_generations();
  10         exit(1);
  11 }
  12
  13 void fatal_error(const char* msg, cell tagged)
  14 {
  15         print_string("fatal_error: "); print_string(msg);
  16         print_string(": "); print_cell_hex(tagged); nl();
  17         exit(1);
  18 }
  19
  20 void factor_vm::critical_error(const char* msg, cell tagged)
  21 {
  22         print_string("You have triggered a bug in Factor. Please report.\n");
  23         print_string("critical_error: "); print_string(msg);
  24         print_string(": "); print_cell_hex(tagged); nl();
  25         factorbug();
  26 }
  27
  28 void factor_vm::throw_error(cell error, stack_frame *callstack_top)
  29 {
  30         /* If the error handler is set, we rewind any C stack frames and
  31         pass the error to user-space. */
  32         if(userenv[BREAK_ENV] != F)
  33         {
  34                 /* If error was thrown during heap scan, we re-enable the GC */
  35                 gc_off = false;
  36
  37                 /* Reset local roots */
  38                 gc_locals.clear();
  39                 gc_bignums.clear();
  40
  41                 /* If we had an underflow or overflow, stack pointers might be
  42                 out of bounds */
  43                 fix_stacks();
  44
  45                 dpush(error);
  46
  47                 /* Errors thrown from C code pass NULL for this parameter.
  48                 Errors thrown from Factor code, or signal handlers, pass the
  49                 actual stack pointer at the time, since the saved pointer is
  50                 not necessarily up to date at that point. */
  51                 if(callstack_top)
  52                 {
  53                         callstack_top = fix_callstack_top(callstack_top,
  54                                 stack_chain->callstack_bottom);
  55                 }
  56                 else
  57                         callstack_top = stack_chain->callstack_top;
  58
  59                 throw_impl(userenv[BREAK_ENV],callstack_top,this);
  60         }
  61         /* Error was thrown in early startup before error handler is set, just
  62         crash. */
  63         else
  64         {
  65                 print_string("You have triggered a bug in Factor. Please report.\n");
  66                 print_string("early_error: ");
  67                 print_obj(error);
  68                 nl();
  69                 factorbug();
  70         }
  71 }
  72
  73 void factor_vm::general_error(vm_error_type error, cell arg1, cell arg2, stack_frame *callstack_top)
  74 {
  75         throw_error(allot_array_4(userenv[ERROR_ENV],
  76                 tag_fixnum(error),arg1,arg2),callstack_top);
  77 }
  78
  79 void factor_vm::type_error(cell type, cell tagged)
  80 {
  81         general_error(ERROR_TYPE,tag_fixnum(type),tagged,NULL);
  82 }
  83
  84 void factor_vm::not_implemented_error()
  85 {
  86         general_error(ERROR_NOT_IMPLEMENTED,F,F,NULL);
  87 }
  88
  89 /* Test if 'fault' is in the guard page at the top or bottom (depending on
  90 offset being 0 or -1) of area+area_size */
  91 bool factor_vm::in_page(cell fault, cell area, cell area_size, int offset)
  92 {
  93         int pagesize = getpagesize();
  94         area += area_size;
  95         area += offset * pagesize;
  96
  97         return fault >= area && fault <= area + pagesize;
  98 }
  99
 100 void factor_vm::memory_protection_error(cell addr, stack_frame *native_stack)
 101 {
 102         if(in_page(addr, ds_bot, 0, -1))
 103                 general_error(ERROR_DS_UNDERFLOW,F,F,native_stack);
 104         else if(in_page(addr, ds_bot, ds_size, 0))
 105                 general_error(ERROR_DS_OVERFLOW,F,F,native_stack);
 106         else if(in_page(addr, rs_bot, 0, -1))
 107                 general_error(ERROR_RS_UNDERFLOW,F,F,native_stack);
 108         else if(in_page(addr, rs_bot, rs_size, 0))
 109                 general_error(ERROR_RS_OVERFLOW,F,F,native_stack);
 110         else if(in_page(addr, nursery.end, 0, 0))
 111                 critical_error("allot_object() missed GC check",0);
 112         else
 113                 general_error(ERROR_MEMORY,allot_cell(addr),F,native_stack);
 114 }
 115
 116 void factor_vm::signal_error(int signal, stack_frame *native_stack)
 117 {
 118         general_error(ERROR_SIGNAL,tag_fixnum(signal),F,native_stack);
 119 }
 120
 121 void factor_vm::divide_by_zero_error()
 122 {
 123         general_error(ERROR_DIVIDE_BY_ZERO,F,F,NULL);
 124 }
 125
 126 void factor_vm::fp_trap_error(unsigned int fpu_status, stack_frame *signal_callstack_top)
 127 {
 128         general_error(ERROR_FP_TRAP,tag_fixnum(fpu_status),F,signal_callstack_top);
 129 }
 130
 131 void factor_vm::primitive_call_clear()
 132 {
 133         throw_impl(dpop(),stack_chain->callstack_bottom,this);
 134 }
 135
 136 /* For testing purposes */
 137 void factor_vm::primitive_unimplemented()
 138 {
 139         not_implemented_error();
 140 }
 141
 142 void factor_vm::memory_signal_handler_impl()
 143 {
 144         memory_protection_error(signal_fault_addr,signal_callstack_top);
 145 }
 146
 147 void memory_signal_handler_impl()
 148 {
 149         SIGNAL_VM_PTR()->memory_signal_handler_impl();
 150 }
 151
 152 void factor_vm::misc_signal_handler_impl()
 153 {
 154         signal_error(signal_number,signal_callstack_top);
 155 }
 156
 157 void misc_signal_handler_impl()
 158 {
 159         SIGNAL_VM_PTR()->misc_signal_handler_impl();
 160 }
 161
 162 void factor_vm::fp_signal_handler_impl()
 163 {
 164         fp_trap_error(signal_fpu_status,signal_callstack_top);
 165 }
 166
 167 void fp_signal_handler_impl()
 168 {
 169         SIGNAL_VM_PTR()->fp_signal_handler_impl();
 170 }
 171
 172 }