static int nexus_drive_is_strength_aware(ivl_nexus_ptr_t nptr)
{
ivl_net_logic_t logic;
if (ivl_nexus_ptr_drive0(nptr) != IVL_DR_STRONG)
return 1;
if (ivl_nexus_ptr_drive1(nptr) != IVL_DR_STRONG)
return 1;
logic = ivl_nexus_ptr_log(nptr);
if (logic != 0) {
/* These logic gates are able to generate unusual
strength values and so their outputs are considered
strength aware. */
if (ivl_logic_type(logic) == IVL_LO_BUFIF0)
return 1;
if (ivl_logic_type(logic) == IVL_LO_BUFIF1)
return 1;
if (ivl_logic_type(logic) == IVL_LO_PMOS)
return 1;
if (ivl_logic_type(logic) == IVL_LO_NMOS)
return 1;
if (ivl_logic_type(logic) == IVL_LO_CMOS)
return 1;
}
return 0;
}
/*
* This tests a bufz device against an output receiver, and determines
* if the device can be skipped. If this function returns true, then a
* gate will be generated for this node. Otherwise, the code generator
* will connect its input to its output and skip the gate.
*/
int can_elide_bufz(ivl_net_logic_t net, ivl_nexus_ptr_t nptr)
{
ivl_nexus_t in_n;
unsigned idx;
/* These are the drives we expect. */
ivl_drive_t dr0 = ivl_nexus_ptr_drive0(nptr);
ivl_drive_t dr1 = ivl_nexus_ptr_drive1(nptr);
int drive_count = 0;
/* If the gate carries a delay, it must remain. */
if (ivl_logic_delay(net, 0) != 0)
return 0;
/* If the input is connected to the output, then do not elide
the gate. This is some sort of cycle. */
if (ivl_logic_pin(net, 0) == ivl_logic_pin(net, 1))
return 0;
in_n = ivl_logic_pin(net, 1);
for (idx = 0 ; idx < ivl_nexus_ptrs(in_n) ; idx += 1) {
ivl_nexus_ptr_t in_np = ivl_nexus_ptr(in_n, idx);
if (ivl_nexus_ptr_log(in_np) == net)
continue;
/* If the driver for the source does not match the
expected drive, then we need to keep the bufz. This
test also catches the case that the input device is
really also an input, as that device will have a
drive of HiZ. We need to keep BUFZ devices in that
case in order to prevent back-flow of data. */
if (ivl_nexus_ptr_drive0(in_np) != dr0)
return 0;
if (ivl_nexus_ptr_drive1(in_np) != dr1)
return 0;
drive_count += 1;
}
/* If the BUFZ input has multiple drivers on its input, then
we need to keep this device in order to hide the
resolution. */
if (drive_count != 1)
return 0;
return 1;
}
static unsigned find_driving_signal(ivl_scope_t scope, ivl_nexus_t nex)
{
ivl_signal_t sig = 0;
unsigned is_array = 0;
int64_t array_idx = 0;
unsigned idx, count = ivl_nexus_ptrs(nex);
for (idx = 0; idx < count; idx += 1) {
ivl_nexus_ptr_t nex_ptr = ivl_nexus_ptr(nex, idx);
ivl_signal_t t_sig = ivl_nexus_ptr_sig(nex_ptr);
if (! t_sig) continue;
if (ivl_signal_local(t_sig)) continue;
/* An output can be used if it is driven by this nexus. */
if ((ivl_nexus_ptr_drive1(nex_ptr) == IVL_DR_HiZ) &&
(ivl_nexus_ptr_drive0(nex_ptr) == IVL_DR_HiZ) &&
(ivl_signal_port(t_sig) != IVL_SIP_OUTPUT)) {
continue;
}
/* We have a signal that can be used to find the name. */
if (sig) {
// HERE: Which one should we use? For now it's the first one found.
// I believe this needs to be solved (see above).
fprintf(stderr, "%s:%u: vlog95 warning: Duplicate name (%s",
ivl_signal_file(t_sig), ivl_signal_lineno(t_sig),
ivl_signal_basename(t_sig));
if (ivl_signal_dimensions(t_sig) > 0) {
int64_t tmp_idx = ivl_nexus_ptr_pin(nex_ptr);
tmp_idx += ivl_signal_array_base(t_sig);
fprintf(stderr, "[%"PRId64"]", tmp_idx);
}
fprintf(stderr, ") found for nexus (%s",
ivl_signal_basename(sig));
if (is_array) fprintf(stderr, "[%"PRId64"]", array_idx);
fprintf(stderr, ")\n");
} else {
sig = t_sig;
if (ivl_signal_dimensions(sig) > 0) {
is_array = 1;
array_idx = ivl_nexus_ptr_pin(nex_ptr);
array_idx += ivl_signal_array_base(sig);
}
}
}
if (sig) {
emit_scope_call_path(scope, ivl_signal_scope(sig));
emit_id(ivl_signal_basename(sig));
if (is_array) fprintf(vlog_out, "[%"PRId64"]", array_idx);
return 1;
}
return 0;
}
/*
* This function is used by the show_signal to dump a constant value
* that is connected to the signal. While we are here, check that the
* value is consistent with the signal itself.
*/
static void signal_nexus_const(ivl_signal_t sig,
ivl_nexus_ptr_t ptr,
ivl_net_const_t con)
{
const char*dr0 = str_tab[ivl_nexus_ptr_drive0(ptr)];
const char*dr1 = str_tab[ivl_nexus_ptr_drive1(ptr)];
const char*bits;
unsigned idx, width = ivl_const_width(con);
fprintf(out, " const-");
switch (ivl_const_type(con)) {
case IVL_VT_BOOL:
case IVL_VT_LOGIC:
bits = ivl_const_bits(con);
assert(bits);
for (idx = 0 ; idx < width ; idx += 1) {
fprintf(out, "%c", bits[width-idx-1]);
}
break;
case IVL_VT_REAL:
fprintf(out, "%f", ivl_const_real(con));
break;
default:
fprintf(out, "????");
break;
}
fprintf(out, " (%s0, %s1, width=%u)\n", dr0, dr1, width);
if (ivl_signal_width(sig) != width) {
fprintf(out, "ERROR: Width of signal does not match "
"width of connected constant vector.\n");
stub_errors += 1;
}
int drive_type_ok = check_signal_drive_type(ivl_signal_data_type(sig),
ivl_const_type(con));
if (! drive_type_ok) {
fprintf(out, "ERROR: Signal data type does not match"
" literal type.\n");
stub_errors += 1;
}
}
static void draw_net_input_x(ivl_nexus_t nex,
struct vvp_nexus_data*nex_data)
{
ivl_island_t island = 0;
int island_input_flag = -1;
ivl_signal_type_t res;
char result[512];
unsigned idx;
char**driver_labels;
unsigned ndrivers = 0;
const char*resolv_type;
char*nex_private = 0;
/* Accumulate nex_data flags. */
int nex_flags = 0;
res = signal_type_of_nexus(nex);
switch (res) {
case IVL_SIT_TRI:
case IVL_SIT_UWIRE:
resolv_type = "tri";
break;
case IVL_SIT_TRI0:
resolv_type = "tri0";
nex_flags |= VVP_NEXUS_DATA_STR;
break;
case IVL_SIT_TRI1:
resolv_type = "tri1";
nex_flags |= VVP_NEXUS_DATA_STR;
break;
case IVL_SIT_TRIAND:
resolv_type = "triand";
break;
case IVL_SIT_TRIOR:
resolv_type = "trior";
break;
default:
fprintf(stderr, "vvp.tgt: Unsupported signal type: %d\n", res);
assert(0);
resolv_type = "tri";
break;
}
for (idx = 0 ; idx < ivl_nexus_ptrs(nex) ; idx += 1) {
ivl_switch_t sw = 0;
ivl_nexus_ptr_t nptr = ivl_nexus_ptr(nex, idx);
/* If this object is part of an island, then we'll be
making a port. If this nexus is an output from any
switches in the island, then set island_input_flag to
false. Save the island cookie. */
if ( (sw = ivl_nexus_ptr_switch(nptr)) ) {
assert(island == 0 || island == ivl_switch_island(sw));
island = ivl_switch_island(sw);
if (nex == ivl_switch_a(sw)) {
nex_flags |= VVP_NEXUS_DATA_STR;
island_input_flag = 0;
} else if (nex == ivl_switch_b(sw)) {
nex_flags |= VVP_NEXUS_DATA_STR;
island_input_flag = 0;
} else if (island_input_flag == -1) {
assert(nex == ivl_switch_enable(sw));
island_input_flag = 1;
}
}
/* Skip input only pins. */
if ((ivl_nexus_ptr_drive0(nptr) == IVL_DR_HiZ)
&& (ivl_nexus_ptr_drive1(nptr) == IVL_DR_HiZ))
continue;
/* Mark the strength-aware flag if the driver can
generate values other than the standard "6"
strength. */
if (nexus_drive_is_strength_aware(nptr))
nex_flags |= VVP_NEXUS_DATA_STR;
/* Save this driver. */
if (ndrivers >= adrivers) {
adrivers += 4;
drivers = realloc(drivers, adrivers*sizeof(ivl_nexus_ptr_t));
}
drivers[ndrivers] = nptr;
ndrivers += 1;
}
if (island_input_flag < 0)
island_input_flag = 0;
/* Save the nexus driver count in the nex_data. */
assert(nex_data);
nex_data->drivers_count = ndrivers;
nex_data->flags |= nex_flags;
/* If the nexus has no drivers, then send a constant HiZ or
0.0 into the net. */
if (ndrivers == 0) {
/* For real nets put 0.0. */
if (signal_data_type_of_nexus(nex) == IVL_VT_REAL) {
nex_private = draw_Cr_to_string(0.0);
} else {
unsigned jdx, wid = width_of_nexus(nex);
char*tmp = malloc(wid + 5);
nex_private = tmp;
strcpy(tmp, "C4<");
tmp += strlen(tmp);
switch (res) {
case IVL_SIT_TRI:
case IVL_SIT_UWIRE:
for (jdx = 0 ; jdx < wid ; jdx += 1)
*tmp++ = 'z';
break;
case IVL_SIT_TRI0:
for (jdx = 0 ; jdx < wid ; jdx += 1)
*tmp++ = '0';
break;
case IVL_SIT_TRI1:
for (jdx = 0 ; jdx < wid ; jdx += 1)
*tmp++ = '1';
break;
default:
assert(0);
}
*tmp++ = '>';
*tmp = 0;
/* Create an "open" driver to hold the HiZ. We
need to do this so that .nets have something to
hang onto. */
char buf[64];
snprintf(buf, sizeof buf, "o%p", nex);
fprintf(vvp_out, "%s .functor BUFZ %u, %s; HiZ drive\n",
buf, wid, nex_private);
nex_private = realloc(nex_private, strlen(buf)+1);
strcpy(nex_private, buf);
}
if (island) {
char*tmp2 = draw_island_port(island, island_input_flag, nex, nex_data, nex_private);
free(nex_private);
nex_private = tmp2;
}
assert(nex_data->net_input == 0);
nex_data->net_input = nex_private;
return;
}
/* A uwire is a tri with only one driver. */
if (res == IVL_SIT_UWIRE) {
if (ndrivers > 1) {
display_multi_driver_error(nex, ndrivers, MDRV_UWIRE);
}
res = IVL_SIT_TRI;
}
/* If the nexus has exactly one driver, then simply draw
it. Note that this will *not* work if the nexus is not a
TRI type nexus. */
if (ndrivers == 1 && res == IVL_SIT_TRI) {
ivl_signal_t path_sig = find_modpath(nex);
if (path_sig) {
char*nex_str = draw_net_input_drive(nex, drivers[0]);
char modpath_label[64];
snprintf(modpath_label, sizeof modpath_label,
"V_%p/m", path_sig);
nex_private = strdup(modpath_label);
draw_modpath(path_sig, nex_str);
} else {
nex_private = draw_net_input_drive(nex, drivers[0]);
}
if (island) {
char*tmp = draw_island_port(island, island_input_flag, nex, nex_data, nex_private);
free(nex_private);
nex_private = tmp;
}
assert(nex_data->net_input == 0);
nex_data->net_input = nex_private;
return;
}
/* We currently only support one driver on real nets. */
if (ndrivers > 1 && signal_data_type_of_nexus(nex) == IVL_VT_REAL) {
display_multi_driver_error(nex, ndrivers, MDRV_REAL);
}
driver_labels = malloc(ndrivers * sizeof(char*));
for (idx = 0; idx < ndrivers; idx += 1) {
driver_labels[idx] = draw_net_input_drive(nex, drivers[idx]);
}
fprintf(vvp_out, "RS_%p .resolv %s", nex, resolv_type);
for (idx = 0; idx < ndrivers; idx += 1) {
fprintf(vvp_out, ", %s", driver_labels[idx]);
free(driver_labels[idx]);
}
fprintf(vvp_out, ";\n");
free(driver_labels);
snprintf(result, sizeof result, "RS_%p", nex);
if (island)
nex_private = draw_island_port(island, island_input_flag, nex, nex_data, result);
else
nex_private = strdup(result);
assert(nex_data->net_input == 0);
nex_data->net_input = nex_private;
}
static char* draw_net_input_drive(ivl_nexus_t nex, ivl_nexus_ptr_t nptr)
{
unsigned nptr_pin = ivl_nexus_ptr_pin(nptr);
ivl_net_const_t cptr;
ivl_net_logic_t lptr;
ivl_signal_t sptr;
ivl_lpm_t lpm;
lptr = ivl_nexus_ptr_log(nptr);
if (lptr
&& ((ivl_logic_type(lptr)==IVL_LO_BUFZ)||(ivl_logic_type(lptr)==IVL_LO_BUFT))
&& (nptr_pin == 0))
do {
if (! can_elide_bufz(lptr, nptr))
break;
return strdup(draw_net_input(ivl_logic_pin(lptr, 1)));
} while(0);
/* If this is a pulldown device, then there is a single pin
that drives a constant value to the entire width of the
vector. The driver normally drives a pull0 value, so a C8<>
constant is appropriate, but if the drive is really strong,
then we can draw a C4<> constant instead. */
if (lptr && (ivl_logic_type(lptr) == IVL_LO_PULLDOWN)) {
if (ivl_nexus_ptr_drive0(nptr) == IVL_DR_STRONG) {
size_t result_len = ivl_logic_width(lptr) + 5;
char*result = malloc(result_len);
char*dp = result;
strcpy(dp, "C4<");
dp += strlen(dp);
str_repeat(dp, "0", ivl_logic_width(lptr));
dp += ivl_logic_width(lptr);
*dp++ = '>';
*dp = 0;
assert(dp >= result);
assert((unsigned)(dp - result) <= result_len);
return result;
} else {
char val[4];
size_t result_len = 3*ivl_logic_width(lptr) + 5;
char*result = malloc(result_len);
char*dp = result;
val[0] = "01234567"[ivl_nexus_ptr_drive0(nptr)];
val[1] = val[0];
val[2] = '0';
val[3] = 0;
strcpy(dp, "C8<");
dp += strlen(dp);
str_repeat(dp, val, ivl_logic_width(lptr));
dp += 3*ivl_logic_width(lptr);
*dp++ = '>';
*dp = 0;
assert(dp >= result);
assert((unsigned)(dp - result) <= result_len);
return result;
}
}
if (lptr && (ivl_logic_type(lptr) == IVL_LO_PULLUP)) {
char*result;
char tmp[32];
if (ivl_nexus_ptr_drive1(nptr) == IVL_DR_STRONG) {
size_t result_len = 5 + ivl_logic_width(lptr);
result = malloc(result_len);
char*dp = result;
strcpy(dp, "C4<");
dp += strlen(dp);
str_repeat(dp, "1", ivl_logic_width(lptr));
dp += ivl_logic_width(lptr);
*dp++ = '>';
*dp = 0;
assert(dp >= result);
assert((unsigned)(dp - result) <= result_len);
} else {
char val[4];
size_t result_len = 5 + 3*ivl_logic_width(lptr);
result = malloc(result_len);
char*dp = result;
val[0] = "01234567"[ivl_nexus_ptr_drive1(nptr)];
val[1] = val[0];
val[2] = '1';
val[3] = 0;
strcpy(dp, "C8<");
dp += strlen(dp);
str_repeat(dp, val, ivl_logic_width(lptr));
dp += 3*ivl_logic_width(lptr);
*dp++ = '>';
*dp = 0;
assert(dp >= result);
assert((unsigned)(dp - result) <= result_len);
}
/* Make the constant an argument to a BUFZ, which is
what we use to drive the PULLed value. */
fprintf(vvp_out, "L_%p .functor BUFT 1, %s, C4<0>, C4<0>, C4<0>;\n",
lptr, result);
snprintf(tmp, sizeof tmp, "L_%p", lptr);
result = realloc(result, strlen(tmp)+1);
strcpy(result, tmp);
return result;
}
if (lptr && (nptr_pin == 0)) {
char tmp[128];
snprintf(tmp, sizeof tmp, "L_%p", lptr);
return strdup(tmp);
}
sptr = ivl_nexus_ptr_sig(nptr);
if (sptr && (ivl_signal_type(sptr) == IVL_SIT_REG)) {
char tmp[128];
/* Input is a .var. This device may be a non-zero pin
because it may be an array of reg vectors. */
snprintf(tmp, sizeof tmp, "v%p_%u", sptr, nptr_pin);
if (ivl_signal_dimensions(sptr) > 0) {
fprintf(vvp_out, "v%p_%u .array/port v%p, %u;\n",
sptr, nptr_pin, sptr, nptr_pin);
}
return strdup(tmp);
}
cptr = ivl_nexus_ptr_con(nptr);
if (cptr) {
char *result = 0;
ivl_expr_t d_rise, d_fall, d_decay;
unsigned dly_width = 0;
/* Constants should have exactly 1 pin, with a literal value. */
assert(nptr_pin == 0);
switch (ivl_const_type(cptr)) {
case IVL_VT_LOGIC:
case IVL_VT_BOOL:
case IVL_VT_STRING:
if ((ivl_nexus_ptr_drive0(nptr) == IVL_DR_STRONG)
&& (ivl_nexus_ptr_drive1(nptr) == IVL_DR_STRONG)) {
result = draw_C4_to_string(cptr);
} else {
result = draw_C8_to_string(cptr,
ivl_nexus_ptr_drive0(nptr),
ivl_nexus_ptr_drive1(nptr));
}
dly_width = ivl_const_width(cptr);
break;
case IVL_VT_REAL:
result = draw_Cr_to_string(ivl_const_real(cptr));
dly_width = 0;
break;
default:
assert(0);
break;
}
d_rise = ivl_const_delay(cptr, 0);
d_fall = ivl_const_delay(cptr, 1);
d_decay = ivl_const_delay(cptr, 2);
/* We have a delayed constant, so we need to build some code. */
if (d_rise != 0) {
char tmp[128];
fprintf(vvp_out, "L_%p/d .functor BUFT 1, %s, "
"C4<0>, C4<0>, C4<0>;\n", cptr, result);
free(result);
/* Is this a fixed or variable delay? */
if (number_is_immediate(d_rise, 64, 0) &&
number_is_immediate(d_fall, 64, 0) &&
number_is_immediate(d_decay, 64, 0)) {
assert(! number_is_unknown(d_rise));
assert(! number_is_unknown(d_fall));
assert(! number_is_unknown(d_decay));
fprintf(vvp_out, "L_%p .delay %u "
"(%" PRIu64 ",%" PRIu64 ",%" PRIu64 ") L_%p/d;\n",
cptr, dly_width,
get_number_immediate64(d_rise),
get_number_immediate64(d_fall),
get_number_immediate64(d_decay), cptr);
} else {
ivl_signal_t sig;
// We do not currently support calculating the decay
// from the rise and fall variable delays.
assert(d_decay != 0);
assert(ivl_expr_type(d_rise) == IVL_EX_SIGNAL);
assert(ivl_expr_type(d_fall) == IVL_EX_SIGNAL);
assert(ivl_expr_type(d_decay) == IVL_EX_SIGNAL);
fprintf(vvp_out, "L_%p .delay %u L_%p/d",
cptr, dly_width, cptr);
sig = ivl_expr_signal(d_rise);
assert(ivl_signal_dimensions(sig) == 0);
fprintf(vvp_out, ", v%p_0", sig);
sig = ivl_expr_signal(d_fall);
assert(ivl_signal_dimensions(sig) == 0);
fprintf(vvp_out, ", v%p_0", sig);
sig = ivl_expr_signal(d_decay);
assert(ivl_signal_dimensions(sig) == 0);
fprintf(vvp_out, ", v%p_0;\n", sig);
}
snprintf(tmp, sizeof tmp, "L_%p", cptr);
result = strdup(tmp);
} else {
char tmp[64];
fprintf(vvp_out, "L_%p .functor BUFT 1, %s, "
"C4<0>, C4<0>, C4<0>;\n", cptr, result);
free(result);
snprintf(tmp, sizeof tmp, "L_%p", cptr);
result = strdup(tmp);
}
return result;
}
lpm = ivl_nexus_ptr_lpm(nptr);
if (lpm) switch (ivl_lpm_type(lpm)) {
case IVL_LPM_FF:
case IVL_LPM_ABS:
case IVL_LPM_ADD:
case IVL_LPM_ARRAY:
case IVL_LPM_CAST_INT2:
case IVL_LPM_CAST_INT:
case IVL_LPM_CAST_REAL:
case IVL_LPM_CONCAT:
case IVL_LPM_CONCATZ:
case IVL_LPM_CMP_EEQ:
case IVL_LPM_CMP_EQ:
case IVL_LPM_CMP_GE:
case IVL_LPM_CMP_GT:
case IVL_LPM_CMP_NE:
case IVL_LPM_CMP_NEE:
case IVL_LPM_RE_AND:
case IVL_LPM_RE_OR:
case IVL_LPM_RE_XOR:
case IVL_LPM_RE_NAND:
case IVL_LPM_RE_NOR:
case IVL_LPM_RE_XNOR:
case IVL_LPM_SFUNC:
case IVL_LPM_SHIFTL:
case IVL_LPM_SHIFTR:
case IVL_LPM_SIGN_EXT:
case IVL_LPM_SUB:
case IVL_LPM_MULT:
case IVL_LPM_MUX:
case IVL_LPM_POW:
case IVL_LPM_DIVIDE:
case IVL_LPM_MOD:
case IVL_LPM_UFUNC:
case IVL_LPM_PART_VP:
case IVL_LPM_PART_PV: /* NOTE: This is only a partial driver. */
case IVL_LPM_REPEAT:
if (ivl_lpm_q(lpm) == nex) {
char tmp[128];
snprintf(tmp, sizeof tmp, "L_%p", lpm);
return strdup(tmp);
}
break;
}
fprintf(stderr, "vvp.tgt error: no input to nexus.\n");
assert(0);
return strdup("C<z>");
}
static unsigned find_signal_in_nexus(ivl_scope_t scope, ivl_nexus_t nex)
{
ivl_signal_t use_sig = 0;
unsigned is_driver = 0;
unsigned is_array = 0;
int64_t array_idx = 0;
unsigned idx, count = ivl_nexus_ptrs(nex);
for (idx = 0; idx < count; idx += 1) {
ivl_nexus_ptr_t nex_ptr = ivl_nexus_ptr(nex, idx);
ivl_signal_t sig = ivl_nexus_ptr_sig(nex_ptr);
if (! sig) continue;
if (ivl_signal_local(sig)) {
/* If the local signal is another receiver skip it. */
if ((ivl_nexus_ptr_drive1(nex_ptr) == IVL_DR_HiZ) &&
(ivl_nexus_ptr_drive0(nex_ptr) == IVL_DR_HiZ)) {
continue;
}
assert(0);
}
/* We have a signal that can be used to find the name. */
if (scope == ivl_signal_scope(sig)) {
if (use_sig) {
/* Swap a receiver for a driver. */
if (is_driver &&
(ivl_nexus_ptr_drive1(nex_ptr) == IVL_DR_HiZ) &&
(ivl_nexus_ptr_drive0(nex_ptr) == IVL_DR_HiZ)) {
use_sig = sig;
is_driver = 0;
if (ivl_signal_dimensions(sig) > 0) {
is_array = 1;
array_idx = ivl_nexus_ptr_pin(nex_ptr);
array_idx += ivl_signal_array_base(sig);
}
continue;
}
// HERE: Which one should we use? For now it's the first one found.
// I believe this needs to be solved (see the inout.v test).
fprintf(stderr, "%s:%u: vlog95 warning: Duplicate "
"name (%s",
ivl_signal_file(sig),
ivl_signal_lineno(sig),
ivl_signal_basename(sig));
if (ivl_signal_dimensions(sig) > 0) {
int64_t tmp_idx = ivl_nexus_ptr_pin(nex_ptr);
tmp_idx += ivl_signal_array_base(sig);
fprintf(stderr, "[%"PRId64"]", tmp_idx);
}
fprintf(stderr, ") found for nexus (%s",
ivl_signal_basename(use_sig));
if (is_array) fprintf(stderr, "[%"PRId64"]", array_idx);
fprintf(stderr, ")\n");
} else {
use_sig = sig;
/* This signal is a driver. */
if ((ivl_nexus_ptr_drive1(nex_ptr) != IVL_DR_HiZ) ||
(ivl_nexus_ptr_drive0(nex_ptr) != IVL_DR_HiZ)) {
is_driver = 1;
}
if (ivl_signal_dimensions(sig) > 0) {
is_array = 1;
array_idx = ivl_nexus_ptr_pin(nex_ptr);
array_idx += ivl_signal_array_base(sig);
}
}
}
}
if (use_sig) {
emit_id(ivl_signal_basename(use_sig));
if (is_array) fprintf(vlog_out, "[%"PRId64"]", array_idx);
return 1;
}
return 0;
}
static char* draw_net_input_drive(ivl_nexus_t nex, ivl_nexus_ptr_t nptr)
{
unsigned nptr_pin = ivl_nexus_ptr_pin(nptr);
ivl_net_const_t cptr;
ivl_net_logic_t lptr;
ivl_signal_t sptr;
ivl_lpm_t lpm;
lptr = ivl_nexus_ptr_log(nptr);
if (lptr
&& ((ivl_logic_type(lptr)==IVL_LO_BUFZ)||(ivl_logic_type(lptr)==IVL_LO_BUFT))
&& (nptr_pin == 0))
do {
if (! can_elide_bufz(lptr, nptr))
break;
return strdup(draw_net_input(ivl_logic_pin(lptr, 1)));
} while(0);
if (lptr && (ivl_logic_type(lptr) == IVL_LO_PULLDOWN)) {
return draw_net_pull(lptr, ivl_nexus_ptr_drive0(nptr), "0");
}
if (lptr && (ivl_logic_type(lptr) == IVL_LO_PULLUP)) {
return draw_net_pull(lptr, ivl_nexus_ptr_drive1(nptr), "1");
}
if (lptr && (nptr_pin == 0)) {
char tmp[128];
snprintf(tmp, sizeof tmp, "L_%p", lptr);
return strdup(tmp);
}
sptr = ivl_nexus_ptr_sig(nptr);
if (sptr && (ivl_signal_type(sptr) == IVL_SIT_REG)) {
char tmp[128];
/* Input is a .var. This device may be a non-zero pin
because it may be an array of reg vectors. */
snprintf(tmp, sizeof tmp, "v%p_%u", sptr, nptr_pin);
if (ivl_signal_dimensions(sptr) > 0) {
fprintf(vvp_out, "v%p_%u .array/port v%p, %u;\n",
sptr, nptr_pin, sptr, nptr_pin);
}
return strdup(tmp);
}
cptr = ivl_nexus_ptr_con(nptr);
if (cptr) {
char tmp[64];
char *result = 0;
ivl_expr_t d_rise, d_fall, d_decay;
unsigned dly_width = 0;
char *dly;
/* Constants should have exactly 1 pin, with a literal value. */
assert(nptr_pin == 0);
switch (ivl_const_type(cptr)) {
case IVL_VT_LOGIC:
case IVL_VT_BOOL:
case IVL_VT_STRING:
if ((ivl_nexus_ptr_drive0(nptr) == IVL_DR_STRONG)
&& (ivl_nexus_ptr_drive1(nptr) == IVL_DR_STRONG)) {
result = draw_C4_to_string(cptr);
} else {
result = draw_C8_to_string(cptr,
ivl_nexus_ptr_drive0(nptr),
ivl_nexus_ptr_drive1(nptr));
}
dly_width = ivl_const_width(cptr);
break;
case IVL_VT_REAL:
result = draw_Cr_to_string(ivl_const_real(cptr));
dly_width = 0;
break;
default:
assert(0);
break;
}
d_rise = ivl_const_delay(cptr, 0);
d_fall = ivl_const_delay(cptr, 1);
d_decay = ivl_const_delay(cptr, 2);
dly = "";
if (d_rise != 0) {
draw_delay(cptr, dly_width, 0, d_rise, d_fall, d_decay);
dly = "/d";
}
fprintf(vvp_out, "L_%p%s .functor BUFT 1, %s, C4<0>, C4<0>, C4<0>;\n",
cptr, dly, result);
free(result);
snprintf(tmp, sizeof tmp, "L_%p", cptr);
return strdup(tmp);
}
lpm = ivl_nexus_ptr_lpm(nptr);
if (lpm) switch (ivl_lpm_type(lpm)) {
case IVL_LPM_FF:
case IVL_LPM_LATCH:
case IVL_LPM_ABS:
case IVL_LPM_ADD:
case IVL_LPM_ARRAY:
case IVL_LPM_CAST_INT2:
case IVL_LPM_CAST_INT:
case IVL_LPM_CAST_REAL:
case IVL_LPM_CONCAT:
case IVL_LPM_CONCATZ:
case IVL_LPM_CMP_EEQ:
case IVL_LPM_CMP_EQ:
case IVL_LPM_CMP_WEQ:
case IVL_LPM_CMP_WNE:
case IVL_LPM_CMP_EQX:
case IVL_LPM_CMP_EQZ:
case IVL_LPM_CMP_GE:
case IVL_LPM_CMP_GT:
case IVL_LPM_CMP_NE:
case IVL_LPM_CMP_NEE:
case IVL_LPM_RE_AND:
case IVL_LPM_RE_OR:
case IVL_LPM_RE_XOR:
case IVL_LPM_RE_NAND:
case IVL_LPM_RE_NOR:
case IVL_LPM_RE_XNOR:
case IVL_LPM_SFUNC:
case IVL_LPM_SHIFTL:
case IVL_LPM_SHIFTR:
case IVL_LPM_SIGN_EXT:
case IVL_LPM_SUB:
case IVL_LPM_MULT:
case IVL_LPM_MUX:
case IVL_LPM_POW:
case IVL_LPM_DIVIDE:
case IVL_LPM_MOD:
case IVL_LPM_UFUNC:
case IVL_LPM_PART_VP:
case IVL_LPM_PART_PV: /* NOTE: This is only a partial driver. */
case IVL_LPM_REPEAT:
case IVL_LPM_SUBSTITUTE:
if (ivl_lpm_q(lpm) == nex) {
char tmp[128];
snprintf(tmp, sizeof tmp, "L_%p", lpm);
return strdup(tmp);
}
break;
}
fprintf(stderr, "vvp.tgt error: no input to nexus.\n");
assert(0);
return strdup("C<z>");
}
static void draw_logic_in_scope(ivl_net_logic_t lptr)
{
unsigned pdx;
const char*ltype = "?";
const char*lcasc = 0;
char identity_val = '0';
int need_delay_flag = ivl_logic_delay(lptr,0)? 1 : 0;
unsigned vector_width = width_of_nexus(ivl_logic_pin(lptr, 0));
ivl_drive_t str0, str1;
int level;
int ninp = ivl_logic_pins(lptr) - 1;
typedef const char*const_charp;
const_charp*input_strings = calloc(ninp, sizeof(const_charp));
for (pdx = 0 ; pdx < ninp ; pdx += 1) {
ivl_nexus_t nex = ivl_logic_pin(lptr, pdx+1);
if (nex == 0) {
/* Only UDPs can have unconnected inputs. */
assert(ivl_logic_type(lptr) == IVL_LO_UDP);
input_strings[pdx] = 0;
} else {
input_strings[pdx] = draw_net_input(nex);
}
}
switch (ivl_logic_type(lptr)) {
case IVL_LO_UDP:
free(input_strings);
draw_udp_in_scope(lptr);
return;
case IVL_LO_BUFZ: {
/* Draw bufz objects, but only if the gate cannot
be elided. If I can elide it, then the
draw_nex_input will take care of it for me. */
ivl_nexus_ptr_t nptr = ivl_logic_pin_ptr(lptr,0);
ltype = "BUFZ";
if (can_elide_bufz(lptr, nptr))
return;
break;
}
case IVL_LO_PULLDOWN:
case IVL_LO_PULLUP:
/* Skip pullup and pulldown objects. Things that have
pull objects as inputs will instead generate the
appropriate C<?> symbol. */
free(input_strings);
return;
case IVL_LO_AND:
ltype = "AND";
identity_val = '1';
break;
case IVL_LO_BUF:
ltype = "BUF";
break;
case IVL_LO_BUFIF0:
ltype = "BUFIF0";
break;
case IVL_LO_BUFIF1:
ltype = "BUFIF1";
break;
case IVL_LO_NAND:
ltype = "NAND";
lcasc = "AND";
identity_val = '1';
break;
case IVL_LO_NOR:
ltype = "NOR";
lcasc = "OR";
break;
case IVL_LO_NOT:
ltype = "NOT";
break;
case IVL_LO_OR:
ltype = "OR";
break;
case IVL_LO_XNOR:
ltype = "XNOR";
lcasc = "XOR";
break;
case IVL_LO_XOR:
ltype = "XOR";
break;
case IVL_LO_CMOS:
ltype = "CMOS";
break;
case IVL_LO_PMOS:
ltype = "PMOS";
break;
case IVL_LO_NMOS:
ltype = "NMOS";
break;
case IVL_LO_RCMOS:
ltype = "RCMOS";
break;
case IVL_LO_RPMOS:
ltype = "RPMOS";
break;
case IVL_LO_RNMOS:
ltype = "RNMOS";
break;
case IVL_LO_NOTIF0:
ltype = "NOTIF0";
break;
case IVL_LO_NOTIF1:
ltype = "NOTIF1";
break;
default:
fprintf(stderr, "vvp.tgt: error: Unhandled logic type: %u\n",
ivl_logic_type(lptr));
ltype = "?";
break;
}
{ ivl_nexus_t nex = ivl_logic_pin(lptr, 0);
ivl_nexus_ptr_t nptr = 0;
unsigned idx;
for (idx = 0 ; idx < ivl_nexus_ptrs(nex) ; idx += 1) {
nptr = ivl_nexus_ptr(nex,idx);
if (ivl_nexus_ptr_log(nptr) != lptr)
continue;
if (ivl_nexus_ptr_pin(nptr) != 0)
continue;
break;
}
str0 = ivl_nexus_ptr_drive0(nptr);
str1 = ivl_nexus_ptr_drive1(nptr);
}
if (!lcasc)
lcasc = ltype;
/* Get all the input label that I will use for parameters to
the functor that I create later. */
ninp = ivl_logic_pins(lptr) - 1;
input_strings = calloc(ninp, sizeof(char*));
for (pdx = 0 ; pdx < ninp ; pdx += 1)
input_strings[pdx] = draw_net_input(ivl_logic_pin(lptr, pdx+1));
level = 0;
ninp = ivl_logic_pins(lptr) - 1;
while (ninp) {
int inst;
for (inst = 0; inst < ninp; inst += 4) {
if (ninp > 4)
fprintf(vvp_out, "L_%p/%d/%d .functor %s %u",
lptr, level, inst, lcasc, vector_width);
else {
fprintf(vvp_out, "L_%p%s .functor %s %u",
lptr, need_delay_flag? "/d" : "",
ltype, vector_width);
if (str0 != IVL_DR_STRONG || str1 != IVL_DR_STRONG)
fprintf(vvp_out, " [%u %u]", str0, str1);
}
for (pdx = inst; pdx < ninp && pdx < inst+4 ; pdx += 1) {
if (level) {
fprintf(vvp_out, ", L_%p/%d/%d",
lptr, level - 1, pdx*4);
} else {
fprintf(vvp_out, ", %s", input_strings[pdx]);
}
}
for ( ; pdx < inst+4 ; pdx += 1) {
unsigned wdx;
fprintf(vvp_out, ", C4<");
for (wdx = 0 ; wdx < vector_width ; wdx += 1)
fprintf(vvp_out, "%c", identity_val);
fprintf(vvp_out, ">");
}
fprintf(vvp_out, ";\n");
}
if (ninp > 4)
ninp = (ninp+3) / 4;
else
ninp = 0;
level += 1;
}
/* Free the array of char*. The strings themselves are
persistent, held by the ivl_nexus_t objects. */
free(input_strings);
/* If there are delays, then draw the delay functor to carry
that delay. This is the final output. */
if (need_delay_flag) {
ivl_expr_t rise_exp = ivl_logic_delay(lptr,0);
ivl_expr_t fall_exp = ivl_logic_delay(lptr,1);
ivl_expr_t decay_exp = ivl_logic_delay(lptr,2);
if (number_is_immediate(rise_exp,64,0)
&& number_is_immediate(fall_exp,64,0)
&& number_is_immediate(decay_exp,64,0)) {
fprintf(vvp_out, "L_%p .delay (%lu,%lu,%lu) L_%p/d;\n",
lptr, get_number_immediate(rise_exp),
get_number_immediate(rise_exp),
get_number_immediate(rise_exp), lptr);
} else {
ivl_signal_t sig;
assert(ivl_expr_type(rise_exp) == IVL_EX_SIGNAL);
assert(ivl_expr_type(fall_exp) == IVL_EX_SIGNAL);
assert(ivl_expr_type(decay_exp) == IVL_EX_SIGNAL);
fprintf(vvp_out, "L_%p .delay L_%p/d", lptr, lptr);
sig = ivl_expr_signal(rise_exp);
assert(ivl_signal_dimensions(sig) == 0);
fprintf(vvp_out, ", v%p_0", sig);
sig = ivl_expr_signal(fall_exp);
assert(ivl_signal_dimensions(sig) == 0);
fprintf(vvp_out, ", v%p_0", sig);
sig = ivl_expr_signal(decay_exp);
assert(ivl_signal_dimensions(sig) == 0);
fprintf(vvp_out, ", v%p_0;\n", sig);
}
}
}
static void show_nexus_details(ivl_signal_t net, ivl_nexus_t nex)
{
unsigned idx;
for (idx = 0 ; idx < ivl_nexus_ptrs(nex) ; idx += 1) {
ivl_net_const_t con;
ivl_net_logic_t logic;
ivl_lpm_t lpm;
ivl_signal_t sig;
ivl_switch_t swt;
ivl_branch_t bra;
ivl_nexus_ptr_t ptr = ivl_nexus_ptr(nex, idx);
const char*dr0 = str_tab[ivl_nexus_ptr_drive0(ptr)];
const char*dr1 = str_tab[ivl_nexus_ptr_drive1(ptr)];
if ((sig = ivl_nexus_ptr_sig(ptr))) {
fprintf(out, " SIG %s word=%u (%s0, %s1)",
ivl_signal_name(sig), ivl_nexus_ptr_pin(ptr), dr0, dr1);
if (ivl_signal_width(sig) != ivl_signal_width(net)) {
fprintf(out, " (ERROR: Width=%u)",
ivl_signal_width(sig));
stub_errors += 1;
}
if (ivl_signal_data_type(sig) != ivl_signal_data_type(net)) {
fprintf(out, " (ERROR: data type mismatch)");
stub_errors += 1;
}
fprintf(out, "\n");
} else if ((logic = ivl_nexus_ptr_log(ptr))) {
fprintf(out, " LOG %s.%s[%u] (%s0, %s1)\n",
ivl_scope_name(ivl_logic_scope(logic)),
ivl_logic_basename(logic),
ivl_nexus_ptr_pin(ptr), dr0, dr1);
} else if ((lpm = ivl_nexus_ptr_lpm(ptr))) {
fprintf(out, " LPM %s.%s (%s0, %s1)\n",
ivl_scope_name(ivl_lpm_scope(lpm)),
ivl_lpm_basename(lpm), dr0, dr1);
} else if ((swt = ivl_nexus_ptr_switch(ptr))) {
fprintf(out, " SWITCH %s.%s\n",
ivl_scope_name(ivl_switch_scope(swt)),
ivl_switch_basename(swt));
} else if ((con = ivl_nexus_ptr_con(ptr))) {
signal_nexus_const(net, ptr, con);
} else if ((bra = ivl_nexus_ptr_branch(ptr))) {
fprintf(out, " BRANCH %p terminal %u\n",
bra, ivl_nexus_ptr_pin(ptr));
} else {
fprintf(out, " ?[%u] (%s0, %s1)\n",
ivl_nexus_ptr_pin(ptr), dr0, dr1);
}
}
}