factor/vm/errors.cpp

#include "master.hpp"

namespace factor
{

/* Global variables used to pass fault handler state from signal handler to
user-space */
cell signal_number;
cell signal_fault_addr;
unsigned int signal_fpu_status;
stack_frame *signal_callstack_top;

void factorvm::out_of_memory()
{
	print_string("Out of memory\n\n");
	dump_generations();
	exit(1);
}

void out_of_memory()
{
	return vm->out_of_memory();
}

void factorvm::fatal_error(const char* msg, cell tagged)
{
	print_string("fatal_error: "); print_string(msg);
	print_string(": "); print_cell_hex(tagged); nl();
	exit(1);
}

void fatal_error(const char* msg, cell tagged)
{
	return vm->fatal_error(msg,tagged);
}

void factorvm::critical_error(const char* msg, cell tagged)
{
	print_string("You have triggered a bug in Factor. Please report.\n");
	print_string("critical_error: "); print_string(msg);
	print_string(": "); print_cell_hex(tagged); nl();
	factorbug();
}

void critical_error(const char* msg, cell tagged)
{
	return vm->critical_error(msg,tagged);
}

void factorvm::throw_error(cell error, stack_frame *callstack_top)
{
	/* If the error handler is set, we rewind any C stack frames and
	pass the error to user-space. */
	if(userenv[BREAK_ENV] != F)
	{
		/* If error was thrown during heap scan, we re-enable the GC */
		gc_off = false;

		/* Reset local roots */
		gc_locals.clear();
		gc_bignums.clear();

		/* If we had an underflow or overflow, stack pointers might be
		out of bounds */
		fix_stacks();

		dpush(error);

		/* Errors thrown from C code pass NULL for this parameter.
		Errors thrown from Factor code, or signal handlers, pass the
		actual stack pointer at the time, since the saved pointer is
		not necessarily up to date at that point. */
		if(callstack_top)
		{
			callstack_top = fix_callstack_top(callstack_top,
				stack_chain->callstack_bottom);
		}
		else
			callstack_top = stack_chain->callstack_top;

		throw_impl(userenv[BREAK_ENV],callstack_top,this);
	}
	/* Error was thrown in early startup before error handler is set, just
	crash. */
	else
	{
		print_string("You have triggered a bug in Factor. Please report.\n");
		print_string("early_error: ");
		print_obj(error);
		nl();
		factorbug();
	}
}

void factorvm::general_error(vm_error_type error, cell arg1, cell arg2, stack_frame *callstack_top)
{
	throw_error(allot_array_4(userenv[ERROR_ENV],
		tag_fixnum(error),arg1,arg2),callstack_top);
}

void general_error(vm_error_type error, cell arg1, cell arg2, stack_frame *callstack_top)
{
	return vm->general_error(error,arg1,arg2,callstack_top);
}

void factorvm::type_error(cell type, cell tagged)
{
	general_error(ERROR_TYPE,tag_fixnum(type),tagged,NULL);
}

void factorvm::not_implemented_error()
{
	general_error(ERROR_NOT_IMPLEMENTED,F,F,NULL);
}

void not_implemented_error()
{
	return vm->not_implemented_error();
}

/* Test if 'fault' is in the guard page at the top or bottom (depending on
offset being 0 or -1) of area+area_size */
bool factorvm::in_page(cell fault, cell area, cell area_size, int offset)
{
	int pagesize = getpagesize();
	area += area_size;
	area += offset * pagesize;

	return fault >= area && fault <= area + pagesize;
}

void factorvm::memory_protection_error(cell addr, stack_frame *native_stack)
{
	if(in_page(addr, ds_bot, 0, -1))
		general_error(ERROR_DS_UNDERFLOW,F,F,native_stack);
	else if(in_page(addr, ds_bot, ds_size, 0))
		general_error(ERROR_DS_OVERFLOW,F,F,native_stack);
	else if(in_page(addr, rs_bot, 0, -1))
		general_error(ERROR_RS_UNDERFLOW,F,F,native_stack);
	else if(in_page(addr, rs_bot, rs_size, 0))
		general_error(ERROR_RS_OVERFLOW,F,F,native_stack);
	else if(in_page(addr, nursery.end, 0, 0))
		critical_error("allot_object() missed GC check",0);
	else
		general_error(ERROR_MEMORY,allot_cell(addr),F,native_stack);
}

void factorvm::signal_error(int signal, stack_frame *native_stack)
{
	general_error(ERROR_SIGNAL,tag_fixnum(signal),F,native_stack);
}

void factorvm::divide_by_zero_error()
{
	general_error(ERROR_DIVIDE_BY_ZERO,F,F,NULL);
}

void divide_by_zero_error()
{
	return vm->divide_by_zero_error();
}

void factorvm::fp_trap_error(unsigned int fpu_status, stack_frame *signal_callstack_top)
{
	general_error(ERROR_FP_TRAP,tag_fixnum(fpu_status),F,signal_callstack_top);
}

inline void factorvm::vmprim_call_clear()
{
	throw_impl(dpop(),stack_chain->callstack_bottom,this);
}

PRIMITIVE(call_clear)
{
	PRIMITIVE_GETVM()->vmprim_call_clear();
}

/* For testing purposes */
inline void factorvm::vmprim_unimplemented()
{
	not_implemented_error();
}

PRIMITIVE(unimplemented)
{
	PRIMITIVE_GETVM()->vmprim_unimplemented();
}

void factorvm::memory_signal_handler_impl()
{
	memory_protection_error(signal_fault_addr,signal_callstack_top);
}

void memory_signal_handler_impl()
{
	return vm->memory_signal_handler_impl();
}

void factorvm::misc_signal_handler_impl()
{
	signal_error(signal_number,signal_callstack_top);
}

void misc_signal_handler_impl()
{
	vm->misc_signal_handler_impl();
}

void factorvm::fp_signal_handler_impl()
{
	fp_trap_error(signal_fpu_status,signal_callstack_top);
}

void fp_signal_handler_impl()
{
	vm->fp_signal_handler_impl();
}

}