factor/vm/run.c

#include "master.h"

void uncurry(CELL obj)
{
	F_CURRY *curry;

	switch(type_of(obj))
	{
	case QUOTATION_TYPE:
		dpush(obj);
		break;
	case CURRY_TYPE:
		curry = untag_object(obj);
		dpush(curry->obj);
		uncurry(curry->quot);
		break;
	default:
		type_error(QUOTATION_TYPE,obj);
		break;
	}
}

void update_xt(F_WORD* word)
{
	word->compiledp = F;

	if(word->def == T)
		word->xt = dosym;
	else if(type_of(word->def) == QUOTATION_TYPE)
	{
		if(profiling)
			word->xt = docol_profiling;
		else
			word->xt = docol;
	}
	else if(type_of(word->def) == FIXNUM_TYPE)
		word->xt = primitives[to_fixnum(word->def)];
	else
		word->xt = undefined;
}

DEFINE_PRIMITIVE(uncurry)
{
	uncurry(dpop());
}

DEFINE_PRIMITIVE(getenv)
{
	F_FIXNUM e = untag_fixnum_fast(dpeek());
	drepl(userenv[e]);
}

DEFINE_PRIMITIVE(setenv)
{
	F_FIXNUM e = untag_fixnum_fast(dpop());
	CELL value = dpop();
	userenv[e] = value;
}

DEFINE_PRIMITIVE(exit)
{
	exit(to_fixnum(dpop()));
}

DEFINE_PRIMITIVE(os_env)
{
	char *name = unbox_char_string();
	char *value = getenv(name);
	if(value == NULL)
		dpush(F);
	else
		box_char_string(value);
}

DEFINE_PRIMITIVE(eq)
{
	CELL lhs = dpop();
	CELL rhs = dpeek();
	drepl((lhs == rhs) ? T : F);
}

DEFINE_PRIMITIVE(millis)
{
	box_unsigned_8(current_millis());
}

DEFINE_PRIMITIVE(sleep)
{
	sleep_millis(to_cell(dpop()));
}

DEFINE_PRIMITIVE(type)
{
	drepl(tag_fixnum(type_of(dpeek())));
}

DEFINE_PRIMITIVE(tag)
{
	drepl(tag_fixnum(TAG(dpeek())));
}

DEFINE_PRIMITIVE(class_hash)
{
	CELL obj = dpeek();
	CELL tag = TAG(obj);
	if(tag == TUPLE_TYPE)
	{
		F_WORD *class = untag_object(get(SLOT(obj,2)));
		drepl(class->hashcode);
	}
	else if(tag == OBJECT_TYPE)
		drepl(get(UNTAG(obj)));
	else
		drepl(tag_fixnum(tag));
}

DEFINE_PRIMITIVE(slot)
{
	F_FIXNUM slot = untag_fixnum_fast(dpop());
	CELL obj = dpop();
	dpush(get(SLOT(obj,slot)));
}

DEFINE_PRIMITIVE(set_slot)
{
	F_FIXNUM slot = untag_fixnum_fast(dpop());
	CELL obj = dpop();
	CELL value = dpop();
	set_slot(obj,slot,value);
}

void fatal_error(char* msg, CELL tagged)
{
	fprintf(stderr,"fatal_error: %s %lx\n",msg,tagged);
	exit(1);
}

void critical_error(char* msg, CELL tagged)
{
	fprintf(stderr,"You have triggered a bug in Factor. Please report.\n");
	fprintf(stderr,"critical_error: %s %lx\n",msg,tagged);
	factorbug();
}

void throw_error(CELL error, F_STACK_FRAME *callstack_top)
{
	/* If error was thrown during heap scan, we re-enable the GC */
	gc_off = false;

	/* Reset local roots */
	extra_roots = stack_chain->extra_roots;

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

	dpush(error);

	/* If the error handler is set, we rewind any C stack frames and
	pass the error to user-space. */
	if(userenv[BREAK_ENV] != F)
	{
		/* 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 = stack_chain->callstack_top;

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

void general_error(F_ERRORTYPE error, CELL arg1, CELL arg2,
	F_STACK_FRAME *callstack_top)
{
	throw_error(allot_array_4(userenv[ERROR_ENV],
		tag_fixnum(error),arg1,arg2),callstack_top);
}

void type_error(CELL type, CELL tagged)
{
	general_error(ERROR_TYPE,tag_fixnum(type),tagged,NULL);
}

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

/* This function is called from the undefined function in cpu_*.S */
FASTCALL void undefined_error(CELL word, F_STACK_FRAME *callstack_top)
{
	stack_chain->callstack_top = callstack_top;
	general_error(ERROR_UNDEFINED_WORD,word,F,NULL);
}

/* 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 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 memory_protection_error(CELL addr, F_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 if(in_page(addr, extra_roots_region->start, 0, -1))
		critical_error("local root underflow",0);
	else if(in_page(addr, extra_roots_region->end, 0, 0))
		critical_error("local root overflow",0);
	else
		general_error(ERROR_MEMORY,allot_cell(addr),F,native_stack);
}

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

void divide_by_zero_error(F_STACK_FRAME *native_stack)
{
	general_error(ERROR_DIVIDE_BY_ZERO,F,F,native_stack);
}

DEFINE_PRIMITIVE(throw)
{
	uncurry(dpop());
	throw_impl(dpop(),stack_chain->callstack_top);
}

void enable_word_profiling(F_WORD *word)
{
	if(word->xt == docol)
		word->xt = docol_profiling;
}

void disable_word_profiling(F_WORD *word)
{
	if(word->xt == docol_profiling)
		word->xt = docol;
}

DEFINE_PRIMITIVE(profiling)
{
	profiling = to_boolean(dpop());

	begin_scan();

	CELL obj;
	while((obj = next_object()) != F)
	{
		if(type_of(obj) == WORD_TYPE)
		{
			if(profiling)
				enable_word_profiling(untag_object(obj));
			else
				disable_word_profiling(untag_object(obj));
		}
	}

	gc_off = false; /* end heap scan */
}