static lref_t *find_matching_escape(lref_t *start_frame, lref_t tag)
{
if (CURRENT_TIB()->escape_frame != NULL)
start_frame = fstack_prev_frame(CURRENT_TIB()->escape_frame);
dscwritef(DF_SHOW_THROWS, (_T("; DEBUG: looking for escape tag ~a\n"), tag));
for(lref_t *frame = start_frame; frame != NULL; frame = fstack_prev_frame(frame))
{
if (fstack_frame_type(frame) != FRAME_ESCAPE)
continue;
lref_t ftag = frame[FOFS_ESCAPE_TAG];
dscwritef(DF_SHOW_THROWS, (_T("; DEBUG: frame: ~c&, tag ~a\n"), frame, ftag));
if (NULLP(ftag) || EQ(ftag, tag)) {
return frame;
}
}
dscwritef(DF_SHOW_THROWS, (_T("; DEBUG: No escape frame for tag ~a\n"), tag));
return NULL;
}
/* Frame stack
*
* The interpreter stack. This is used in a very similar fashion
* to the traditional C stack, with CURRENT_TIB()->frame and
* CURRENT_TIB()->fsp serving as base and stack pointers,
* respectively.
*/
EVAL_INLINE void *fstack_alloca(size_t size)
{
size = (size / sizeof(lref_t)) + 1;
CURRENT_TIB()->fsp = CURRENT_TIB()->fsp - size;
return (void *)(CURRENT_TIB()->fsp);
}
lref_t lifoplog_enable(lref_t enablep)
{
lref_t prev = boolcons(CURRENT_TIB()->foplog_enable);
CURRENT_TIB()->foplog_enable = TRUEP(enablep);
return prev;
}
lref_t lifoplog_reset()
{
for(int ii = 0; ii < FOPLOG_SIZE; ii++)
CURRENT_TIB()->foplog[ii] = NIL;
CURRENT_TIB()->foplog_index = 0;
return NIL;
}
EVAL_INLINE void fstack_enter_frame(enum frame_type_t ft)
{
CURRENT_TIB()->count_enter_frame++;
fstack_push((lref_t)(CURRENT_TIB()->frame));
CURRENT_TIB()->frame = CURRENT_TIB()->fsp;
fstack_push((lref_t)ft);
}
EVAL_INLINE lref_t *fstack_enter_frame(enum frame_type_t ft, size_t slots)
{
lref_t *prev_frame = CURRENT_TIB()->frame;
lref_t *frame = CURRENT_TIB()->fsp - 1;
CURRENT_TIB()->frame = frame;;
CURRENT_TIB()->fsp = CURRENT_TIB()->frame - 1 - slots;
frame[FOFS_LINK] = (lref_t)prev_frame;
frame[FOFS_FTYPE] = (lref_t)ft;
return frame;
}
lref_t lifoplog_snapshot()
{
lref_t result = vectorcons(FOPLOG_SIZE, fixcons(-1));
for(int ii = 0; ii < FOPLOG_SIZE; ii++)
SET_VECTOR_ELEM(result, ii, CURRENT_TIB()->foplog[ii]);
return result;
}
EVAL_INLINE jmp_buf *fstack_enter_catch_frame(lref_t tag, lref_t *escape_frame) {
lref_t *frame = fstack_enter_frame(FRAME_ESCAPE, 3);
frame[FOFS_ESCAPE_TAG] = tag;
frame[FOFS_ESCAPE_FRAME] = (lref_t)CURRENT_TIB()->frame;
frame[FOFS_ESCAPE_JMPBUF_PTR] = (lref_t)fstack_alloca(sizeof(jmp_buf));
return (jmp_buf *)frame[FOFS_ESCAPE_JMPBUF_PTR];
}
lref_t topmost_primitive()
{
for(lref_t *frame = CURRENT_TIB()->frame; frame != NULL; frame = fstack_prev_frame(frame))
{
if (fstack_frame_type(frame) == FRAME_SUBR)
return frame[FOFS_SUBR_SUBR];
}
return NIL;
}
void unwind_stack_for_throw()
{
for(lref_t *frame = CURRENT_TIB()->frame; frame != NULL; frame = fstack_prev_frame(frame))
{
if (fstack_frame_type(frame) == FRAME_UNWIND)
{
dscwritef(DF_SHOW_THROWS, (_T("; DEBUG: throw invoking unwind, frame: ~c&\n"), frame));
apply1(frame[FOFS_UNWIND_AFTER], 0, NULL);
continue;
}
if (fstack_frame_type(frame) != FRAME_ESCAPE)
continue;
if (frame == CURRENT_TIB()->escape_frame)
{
jmp_buf *jmpbuf = (jmp_buf *)frame[FOFS_ESCAPE_JMPBUF_PTR];
dscwritef(DF_SHOW_THROWS, (_T("; DEBUG: longjmp to frame: ~c&, jmpbuf: ~c&\n"), frame, jmpbuf));
CURRENT_TIB()->escape_frame = NULL;
CURRENT_TIB()->frame = (lref_t *)frame[FOFS_ESCAPE_FRAME];
CURRENT_TIB()->fsp = CURRENT_TIB()->frame + 1;
longjmp(*jmpbuf, 1);
}
}
}
void unwind_stack_for_throw()
{
for(lref_t *frame = CURRENT_TIB()->frame;
frame != NULL;
frame = fstack_prev_frame(frame))
{
if (fstack_frame_type(frame) == FRAME_UNWIND)
{
dscwritef(DF_SHOW_THROWS, (_T("; DEBUG: throw invoking unwind : ~c&\n"), frame));
apply1(frame[FOFS_UNWIND_AFTER], 0, NULL);
continue;
}
if (fstack_frame_type(frame) != FRAME_ESCAPE)
continue;
if (frame == CURRENT_TIB()->escape_frame)
{
dscwritef(DF_SHOW_THROWS, (_T("; DEBUG: setjmp (from fsp=~c&) to target frame: ~c&\n"), CURRENT_TIB()->fsp, frame));
CURRENT_TIB()->escape_frame = NULL;
CURRENT_TIB()->frame = (lref_t *)frame[FOFS_ESCAPE_FRAME];
CURRENT_TIB()->fsp = CURRENT_TIB()->frame + 1;
longjmp((struct __jmp_buf_tag *)frame[FOFS_ESCAPE_JMPBUF_PTR], 1);
}
}
}
lref_t ltime_apply0(lref_t fn)
{
if (!PROCEDUREP(fn))
vmerror_wrong_type_n(1, fn);
flonum_t t = sys_runtime();
flonum_t gc_t = interp.gc_total_run_time;
size_t cells = interp.gc_total_cells_allocated;
size_t fops = CURRENT_TIB()->count_fop;
size_t frames = CURRENT_TIB()->count_enter_frame;
lref_t argv[6];
argv[0] = apply1(fn, 0, NULL);
argv[1] = flocons(sys_runtime() - t);
argv[2] = flocons(interp.gc_total_run_time - gc_t);
argv[3] = fixcons(interp.gc_total_cells_allocated - cells);
argv[4] = fixcons(CURRENT_TIB()->count_fop - fops);
argv[5] = fixcons(CURRENT_TIB()->count_enter_frame - frames);
return lvector(6, argv);
}
lref_t vmtrap(enum trap_type_t trap, enum vmt_options_t options, size_t argc, ...)
{
assert((trap > 0) && (trap <= TRAP_LAST));
assert(argc < ARG_BUF_LEN);
dscwritef(DF_SHOW_TRAPS, (_T("; DEBUG: trap : ~cS\n"),
trap_type_name(trap)));
lref_t handler = interp.trap_handlers[trap];
if (!PROCEDUREP(handler))
{
if(!NULLP(handler))
vmtrap_panic(trap, "bad trap handler");
if (!(options & VMT_OPTIONAL_TRAP))
vmtrap_panic(trap, "missing trap handler");
return NIL;
}
lref_t retval = NIL;
va_list args;
va_start(args, argc);
lref_t argv[ARG_BUF_LEN];
argv[0] = fixcons(trap);
argv[1] = fixcons((fixnum_t)CURRENT_TIB()->frame);
for (size_t ii = 2; ii < argc + 2; ii++)
argv[ii] = va_arg(args, lref_t);
va_end(args);
retval = apply1(handler, argc + 2, argv);
if (options & VMT_HANDLER_MUST_ESCAPE)
vmtrap_panic(trap, "trap handler must escape");
return retval;
}
void scan_postmortem_dump()
{
#if 0
lref_t oport = CURRENT_DEBUG_PORT();
for(frame_t *frame = CURRENT_TIB()->frame;
frame != NULL;
frame = frame->prev_frame)
{
scwritef(_T("\n*** FRAME=~cd: "), oport, frame);
switch (frame->type)
{
case FRAME_EVAL:
scwritef(_T("eval > ~s in ~s\n"), oport, *frame->as.eval.form,
frame->as.eval.initial_form);
break;
case FRAME_ESCAPE:
scwritef(_T("try > ~s\n"), oport, frame->as.escape.tag);
break;
case FRAME_UNWIND:
scwritef(_T("unwind-protect >\n"), oport);
break;
case FRAME_SUBR:
scwritef(_T("subr > ~s\n"), oport, frame->as.subr.subr);
break;
default:
scwritef(_T("<< INVALID-FRAME-TYPE >>\n"), oport);
break;
}
lflush_port(oport);
}
#endif
}
void init0(int argc, _TCHAR * argv[], enum debug_flag_t initial_debug_flags)
{
global_environment_asserts();
previous_panic_handler = set_panic_handler(scan_panic_handler);
/** Initialize the interpreter globals */
memset(&interp, 0, sizeof(interp));
/* We need the debug flags pretty early on, so that we know how
* to set up debugger I/O. */
interp.debug_flags = debug_flags_from_environment(initial_debug_flags);
init_debugger_output();
interp.init_load_file_count = 0;
interp.intr_pending = VMINTR_NONE;
interp.intr_masked = false;
interp.launch_realtime = sys_runtime();
interp.fasl_package_list = NIL;
gc_protect(_T("fasl-package-list"), &interp.fasl_package_list, 1);
/* Statistics Counters */
interp.gc_heap_segment_size = DEFAULT_HEAP_SEGMENT_SIZE;
interp.gc_max_heap_segments = DEFAULT_MAX_HEAP_SEGMENTS;
interp.gc_current_heap_segments = 0;
interp.gc_heap_segments = NULL;
interp.gc_total_cells_allocated = 0;
interp.gc_malloc_bytes_threshold = (sizeof(struct lobject_t) * interp.gc_heap_segment_size);
interp.gc_total_run_time = 0.0;
interp.gc_start_time = 0.0;
interp.thread.fsp = &(interp.thread.frame_stack[FRAME_STACK_SIZE]);
interp.thread.frame = NULL;
process_vm_arguments(argc, argv);
if (interp.debug_flags != DF_NONE)
dscwritef(DF_ALWAYS, ("; DEBUG: debug_flags=0x~cx\n", interp.debug_flags));
/*** Create the gc heap and populate it with the standard objects */
gc_initialize_heap();
create_initial_packages();
init_base_scheme_objects();
init_stdio_ports();
register_main_subrs();
gc_protect(_T("handler-frames"), &(CURRENT_TIB()->handler_frames), 1);
gc_protect(_T("frame-stack"), (struct lobject_t **)&(CURRENT_TIB()->frame_stack[0]), sizeof(CURRENT_TIB()->frame_stack) / sizeof(lref_t));
accept_command_line_arguments(argc, argv);
load_init_load_files();
}
static lref_t execute_fast_op(lref_t fop, lref_t env)
{
lref_t retval = NIL;
lref_t sym;
lref_t binding;
lref_t fn;
lref_t args;
size_t argc;
lref_t argv[ARG_BUF_LEN];
lref_t after;
lref_t tag;
lref_t cell;
lref_t escape_retval;
jmp_buf *jmpbuf;
STACK_CHECK(&fop);
_process_interrupts();
fstack_enter_eval_frame(&fop, fop, env);
while(!NULLP(fop)) {
switch(fop->header.opcode)
{
case FOP_LITERAL:
retval = fop->as.fast_op.arg1;
fop = fop->as.fast_op.next;
break;
case FOP_GLOBAL_REF:
sym = fop->as.fast_op.arg1;
binding = SYMBOL_VCELL(sym);
if (UNBOUND_MARKER_P(binding))
vmerror_unbound(sym);
retval = binding;
fop = fop->as.fast_op.next;
break;
case FOP_GLOBAL_SET:
sym = fop->as.fast_op.arg1;
binding = SYMBOL_VCELL(sym);
if (UNBOUND_MARKER_P(binding))
vmerror_unbound(sym);
SET_SYMBOL_VCELL(sym, retval);
fop = fop->as.fast_op.next;
break;
case FOP_APPLY_GLOBAL:
sym = fop->as.fast_op.arg1;
fn = SYMBOL_VCELL(sym);
if (UNBOUND_MARKER_P(fn))
vmerror_unbound(sym);
argc = 0;
args = fop->as.fast_op.arg2;
while (CONSP(args)) {
if (argc >= ARG_BUF_LEN) {
vmerror_unsupported(_T("too many actual arguments"));
break;
}
argv[argc] = execute_fast_op(CAR(args), env);
args = CDR(args);
argc++;
}
if (!NULLP(args))
vmerror_arg_out_of_range(fop->as.fast_op.arg2,
_T("bad formal argument list"));
fop = apply(fn, argc, argv, &env, &retval);
break;
case FOP_APPLY:
argc = 0;
fn = execute_fast_op(fop->as.fast_op.arg1, env);
args = fop->as.fast_op.arg2;
while (CONSP(args)) {
if (argc >= ARG_BUF_LEN) {
vmerror_unsupported(_T("too many actual arguments"));
break;
}
argv[argc] = execute_fast_op(CAR(args), env);
args = CDR(args);
argc++;
}
if (!NULLP(args))
vmerror_arg_out_of_range(fop->as.fast_op.arg2,
_T("bad formal argument list"));
fop = apply(fn, argc, argv, &env, &retval);
break;
case FOP_IF_TRUE:
if (TRUEP(retval))
fop = fop->as.fast_op.arg1;
else
fop = fop->as.fast_op.arg2;
break;
case FOP_RETVAL:
fop = fop->as.fast_op.next;
break;
case FOP_SEQUENCE:
retval = execute_fast_op(fop->as.fast_op.arg1, env);
fop = fop->as.fast_op.arg2;
break;
case FOP_THROW:
tag = execute_fast_op(fop->as.fast_op.arg1, env);
escape_retval = execute_fast_op(fop->as.fast_op.arg2, env);
dscwritef(DF_SHOW_THROWS, (_T("; DEBUG: throw ~a, retval = ~a\n"), tag, escape_retval));
CURRENT_TIB()->escape_frame = find_matching_escape(CURRENT_TIB()->frame, tag);
CURRENT_TIB()->escape_value = escape_retval;
if (CURRENT_TIB()->escape_frame == NULL) {
/* If we don't find a matching catch for the throw, we have a
* problem and need to invoke a trap. */
vmtrap(TRAP_UNCAUGHT_THROW,
(enum vmt_options_t)(VMT_MANDATORY_TRAP | VMT_HANDLER_MUST_ESCAPE),
2, tag, escape_retval);
}
unwind_stack_for_throw();
fop = fop->as.fast_op.next;
break;
case FOP_CATCH:
tag = execute_fast_op(fop->as.fast_op.arg1, env);
jmpbuf = fstack_enter_catch_frame(tag, CURRENT_TIB()->frame);
dscwritef(DF_SHOW_THROWS, (_T("; DEBUG: setjmp tag: ~a, frame: ~c&, jmpbuf: ~c&\n"), tag, CURRENT_TIB()->frame, jmpbuf));
if (setjmp(*jmpbuf) == 0) {
retval = execute_fast_op(fop->as.fast_op.arg2, env);
} else {
dscwritef(DF_SHOW_THROWS, (_T("; DEBUG: catch, retval = ~a\n"), CURRENT_TIB()->escape_value));
retval = CURRENT_TIB()->escape_value;
CURRENT_TIB()->escape_value = NIL;
}
fstack_leave_frame();
fop = fop->as.fast_op.next;
break;
case FOP_WITH_UNWIND_FN:
fstack_enter_unwind_frame(execute_fast_op(fop->as.fast_op.arg1, env));
retval = execute_fast_op(fop->as.fast_op.arg2, env);
after = CURRENT_TIB()->frame[FOFS_UNWIND_AFTER];
fstack_leave_frame();
apply1(after, 0, NULL);
fop = fop->as.fast_op.next;
break;
case FOP_CLOSURE:
retval = lclosurecons(env,
lcons(lcar(fop->as.fast_op.arg1),
fop->as.fast_op.arg2),
lcdr(fop->as.fast_op.arg1));
fop = fop->as.fast_op.next;
break;
case FOP_CAR:
retval = lcar(retval);
fop = fop->as.fast_op.next;
break;
case FOP_CDR:
retval = lcdr(retval);
fop = fop->as.fast_op.next;
break;
case FOP_NOT:
retval = boolcons(!TRUEP(retval));
fop = fop->as.fast_op.next;
break;
case FOP_NULLP:
retval = boolcons(NULLP(retval));
fop = fop->as.fast_op.next;
break;
case FOP_EQP:
retval = boolcons(EQ(execute_fast_op(fop->as.fast_op.arg1, env),
execute_fast_op(fop->as.fast_op.arg2, env)));
fop = fop->as.fast_op.next;
break;
case FOP_GET_ENV:
retval = env;
fop = fop->as.fast_op.next;
break;
case FOP_GLOBAL_DEF: // three args, third was genv, but currently unused
retval = lidefine_global(fop->as.fast_op.arg1, fop->as.fast_op.arg2);
fop = fop->as.fast_op.next;
break;
case FOP_GET_FSP:
retval = fixcons((fixnum_t)CURRENT_TIB()->fsp);
fop = fop->as.fast_op.next;
break;
case FOP_GET_FRAME:
retval = fixcons((fixnum_t)CURRENT_TIB()->frame);
fop = fop->as.fast_op.next;
break;
case FOP_GET_HFRAMES:
retval = CURRENT_TIB()->handler_frames;
fop = fop->as.fast_op.next;
break;
case FOP_SET_HFRAMES:
CURRENT_TIB()->handler_frames = execute_fast_op(fop->as.fast_op.arg1, env);
fop = fop->as.fast_op.next;
break;
case FOP_GLOBAL_PRESERVE_FRAME:
sym = fop->as.fast_op.arg1;
binding = SYMBOL_VCELL(sym);
if (UNBOUND_MARKER_P(binding))
vmerror_unbound(sym);
SET_SYMBOL_VCELL(sym, fixcons((fixnum_t)CURRENT_TIB()->frame));
retval = execute_fast_op(fop->as.fast_op.arg2, env);
fop = fop->as.fast_op.next;
break;
case FOP_STACK_BOUNDARY:
sym = execute_fast_op(fop->as.fast_op.arg1, env);
fstack_enter_boundary_frame(sym);
retval = execute_fast_op(fop->as.fast_op.arg2, env);
fstack_leave_frame();
fop = fop->as.fast_op.next;
break;
case FOP_FAST_ENQUEUE_CELL:
retval = execute_fast_op(fop->as.fast_op.arg2, env);
cell = execute_fast_op(fop->as.fast_op.arg1, env);
SET_CDR(CAR(retval), cell);
SET_CAR(retval, cell);
fop = fop->as.fast_op.next;
break;
case FOP_WHILE_TRUE:
while(TRUEP(execute_fast_op(fop->as.fast_op.arg1, env))) {
retval = execute_fast_op(fop->as.fast_op.arg2, env);
}
fop = fop->as.fast_op.next;
break;
case FOP_LOCAL_REF_BY_INDEX:
retval = lenvlookup_by_index(FIXNM(fop->as.fast_op.arg1),
FIXNM(fop->as.fast_op.arg2),
env);
fop = fop->as.fast_op.next;
break;
case FOP_LOCAL_REF_RESTARG:
retval = lenvlookup_restarg_by_index(FIXNM(fop->as.fast_op.arg1),
FIXNM(fop->as.fast_op.arg2),
env);
fop = fop->as.fast_op.next;
break;
case FOP_LOCAL_SET_BY_INDEX:
lenvlookup_set_by_index(FIXNM(fop->as.fast_op.arg1),
FIXNM(fop->as.fast_op.arg2),
env,
retval);
fop = fop->as.fast_op.next;
break;
default:
panic("Unsupported fast-op");
}
}
fstack_leave_frame();
return retval;
}
EVAL_INLINE void fstack_push(lref_t val)
{
*(--CURRENT_TIB()->fsp) = val;
}
EVAL_INLINE void fstack_leave_frame()
{
CURRENT_TIB()->fsp = CURRENT_TIB()->frame + 1;
CURRENT_TIB()->frame = *(lref_t **)(CURRENT_TIB()->frame);
}
