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scope.c
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/*
* Copyright (C) 2010-2024 Cary R. ([email protected])
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
# include <inttypes.h>
# include <string.h>
# include "config.h"
# include "vlog95_priv.h"
# include "ivl_alloc.h"
const char *func_rtn_name = 0;
static void emit_func_return(ivl_signal_t sig)
{
// Handle SV void functions.
if (sig == 0)
return;
if (ivl_signal_dimensions(sig) > 0) {
fprintf(stderr, "%s:%u: vlog95 error: A function cannot return "
"an array.\n", ivl_signal_file(sig),
ivl_signal_lineno(sig));
vlog_errors += 1;
} else if (ivl_signal_integer(sig)) {
fprintf(vlog_out, " integer");
} else if (ivl_signal_data_type(sig) == IVL_VT_REAL) {
fprintf(vlog_out, " real");
} else {
if (ivl_signal_signed(sig)) {
if (allow_signed) {
fprintf(vlog_out, " signed");
} else {
fprintf(stderr, "%s:%u: vlog95 error: Signed return "
"value for function `%s` is not "
"supported.\n",
ivl_signal_file(sig),
ivl_signal_lineno(sig),
ivl_signal_basename(sig));
vlog_errors += 1;
}
}
int msb, lsb;
get_sig_msb_lsb(sig, &msb, &lsb);
if (msb != 0 || lsb != 0) fprintf(vlog_out, " [%d:%d]", msb, lsb);
}
}
void emit_sig_file_line(ivl_signal_t sig)
{
if (emit_file_line) {
fprintf(vlog_out, " /* %s:%u */",
ivl_signal_file(sig),
ivl_signal_lineno(sig));
}
}
static void emit_sig_id(ivl_signal_t sig)
{
emit_id(ivl_signal_basename(sig));
fprintf(vlog_out, ";");
emit_sig_file_line(sig);
fprintf(vlog_out, "\n");
}
static void emit_var_def(ivl_signal_t sig)
{
if (ivl_signal_local(sig)) return;
fprintf(vlog_out, "%*c", indent, ' ');
if (ivl_signal_integer(sig)) {
fprintf(vlog_out, "integer ");
emit_sig_id(sig);
if (ivl_signal_dimensions(sig) > 0) {
fprintf(stderr, "%s:%u: vlog95 error: Integer arrays (%s) "
"are not supported.\n", ivl_signal_file(sig),
ivl_signal_lineno(sig),
ivl_signal_basename(sig));
vlog_errors += 1;
}
} else if (ivl_signal_data_type(sig) == IVL_VT_REAL) {
fprintf(vlog_out, "real ");
emit_sig_id(sig);
if (ivl_signal_dimensions(sig) > 0) {
fprintf(stderr, "%s:%u: vlog95 error: Real arrays (%s) "
"are not supported.\n", ivl_signal_file(sig),
ivl_signal_lineno(sig),
ivl_signal_basename(sig));
vlog_errors += 1;
}
} else if (ivl_signal_data_type(sig) == IVL_VT_STRING) {
fprintf(vlog_out, "string ");
emit_sig_id(sig);
fprintf(stderr, "%s:%u: vlog95 error: SystemVerilog strings (%s) "
"are not supported.\n", ivl_signal_file(sig),
ivl_signal_lineno(sig), ivl_signal_basename(sig));
vlog_errors += 1;
} else if (ivl_signal_data_type(sig) == IVL_VT_DARRAY) {
fprintf(vlog_out, "<dynamic array> ");
emit_sig_id(sig);
fprintf(stderr, "%s:%u: vlog95 error: SystemVerilog dynamic "
"arrays (%s) are not supported.\n",
ivl_signal_file(sig),
ivl_signal_lineno(sig), ivl_signal_basename(sig));
vlog_errors += 1;
} else if (ivl_signal_data_type(sig) == IVL_VT_QUEUE) {
fprintf(vlog_out, "<queue> ");
emit_sig_id(sig);
fprintf(stderr, "%s:%u: vlog95 error: SystemVerilog queues "
"(%s) are not supported.\n",
ivl_signal_file(sig),
ivl_signal_lineno(sig), ivl_signal_basename(sig));
vlog_errors += 1;
} else {
int msb, lsb;
get_sig_msb_lsb(sig, &msb, &lsb);
fprintf(vlog_out, "reg ");
if (ivl_signal_signed(sig)) {
if (allow_signed) {
fprintf(vlog_out, "signed ");
} else {
fprintf(stderr, "%s:%u: vlog95 error: Signed registers "
"(%s) are not supported.\n",
ivl_signal_file(sig),
ivl_signal_lineno(sig),
ivl_signal_basename(sig));
vlog_errors += 1;
}
}
if (msb != 0 || lsb != 0) fprintf(vlog_out, "[%d:%d] ", msb, lsb);
emit_id(ivl_signal_basename(sig));
if (ivl_signal_dimensions(sig) > 0) {
unsigned wd_count = ivl_signal_array_count(sig);
int first = ivl_signal_array_base(sig);
int last = first + wd_count - 1;
if (ivl_signal_array_addr_swapped(sig)) {
fprintf(vlog_out, " [%d:%d]", last, first);
} else {
fprintf(vlog_out, " [%d:%d]", first, last);
}
}
fprintf(vlog_out, ";");
emit_sig_file_line(sig);
fprintf(vlog_out, "\n");
}
}
/*
* Keep a list of constants that drive nets and need to be emitted as
* a continuous assignment.
*/
typedef struct {
ivl_signal_t sig;
ivl_nexus_ptr_t nex_ptr;
} net_const_t;
static net_const_t *net_consts = 0;
static unsigned num_net_consts = 0;
static void add_net_const_to_list(ivl_signal_t sig, ivl_nexus_ptr_t nex_ptr)
{
num_net_consts += 1;
net_consts = realloc(net_consts, num_net_consts * sizeof(net_const_t));
net_consts[num_net_consts-1].sig = sig;
net_consts[num_net_consts-1].nex_ptr = nex_ptr;
}
static unsigned emit_and_free_net_const_list(ivl_scope_t scope)
{
unsigned idx;
for (idx = 0; idx < num_net_consts; idx += 1) {
emit_signal_net_const_as_ca(scope, net_consts[idx].sig,
net_consts[idx].nex_ptr);
}
free(net_consts);
net_consts = 0;
idx = num_net_consts != 0;
num_net_consts = 0;
return idx;
}
static void save_net_constants(const ivl_scope_t scope, ivl_signal_t sig)
{
ivl_nexus_t nex = ivl_signal_nex(sig, 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_net_const_t net_const = ivl_nexus_ptr_con(nex_ptr);
if (! net_const) continue;
if (scope != ivl_const_scope(net_const)) continue;
add_net_const_to_list(sig, nex_ptr);
}
}
static void emit_net_def(ivl_scope_t scope, ivl_signal_t sig)
{
int msb, lsb;
get_sig_msb_lsb(sig, &msb, &lsb);
if (ivl_signal_local(sig)) return;
fprintf(vlog_out, "%*c", indent, ' ');
if (ivl_signal_data_type(sig) == IVL_VT_REAL){
fprintf(vlog_out, "wire ");
emit_sig_id(sig);
fprintf(stderr, "%s:%u: vlog95 error: Real nets (%s) are "
"not supported.\n", ivl_signal_file(sig),
ivl_signal_lineno(sig), ivl_signal_basename(sig));
vlog_errors += 1;
} else if (ivl_signal_dimensions(sig) > 0) {
fprintf(vlog_out, "wire ");
if (msb != 0 || lsb != 0) fprintf(vlog_out, "[%d:%d] ", msb, lsb);
emit_sig_id(sig);
fprintf(stderr, "%s:%u: vlog95 error: Array nets (%s) are "
"not supported.\n", ivl_signal_file(sig),
ivl_signal_lineno(sig), ivl_signal_basename(sig));
vlog_errors += 1;
} else {
switch (ivl_signal_type(sig)) {
case IVL_SIT_TRI:
case IVL_SIT_UWIRE:
// HERE: Need to add support for supply nets. Probably supply strength
// with a constant 0/1 driver for all the bits.
fprintf(vlog_out, "wire ");
break;
case IVL_SIT_TRI0:
fprintf(vlog_out, "tri0 ");
break;
case IVL_SIT_TRI1:
fprintf(vlog_out, "tri1 ");
break;
case IVL_SIT_TRIAND:
fprintf(vlog_out, "wand ");
break;
case IVL_SIT_TRIOR:
fprintf(vlog_out, "wor ");
break;
default:
fprintf(vlog_out, "<unknown> ");
fprintf(stderr, "%s:%u: vlog95 error: Unknown net type "
"(%d).\n", ivl_signal_file(sig),
ivl_signal_lineno(sig), (int)ivl_signal_type(sig));
vlog_errors += 1;
break;
}
if (ivl_signal_signed(sig)) {
if (allow_signed) {
fprintf(vlog_out, "signed ");
} else {
fprintf(stderr, "%s:%u: vlog95 error: Signed nets (%s) "
"are not supported.\n",
ivl_signal_file(sig),
ivl_signal_lineno(sig),
ivl_signal_basename(sig));
vlog_errors += 1;
}
}
if (msb != 0 || lsb != 0) fprintf(vlog_out, "[%d:%d] ", msb, lsb);
emit_sig_id(sig);
/* A constant driving a net does not create an lpm or logic
* element in the design so save them from the definition. */
save_net_constants(scope, sig);
}
}
static bool scope_is_unique(ivl_scope_t scope)
{
unsigned int count = ivl_scope_params(scope);
for (unsigned int idx = 0; idx < count; idx++) {
ivl_parameter_t par = ivl_scope_param(scope, idx);
if (!ivl_parameter_local(par)) {
return false;
}
}
return true;
}
static void emit_mangled_name(ivl_scope_t scope, unsigned root)
{
/* If the module has non-local parameters and it's not a root module then it
* may not be unique so we create a mangled name version instead. The
* mangled name is of the form:
* <module_name>[<full_instance_scope>]. */
if (!root && !scope_is_unique(scope)) {
char *name;
size_t len = strlen(ivl_scope_name(scope)) +
strlen(ivl_scope_tname(scope)) + 3;
name = (char *)malloc(len);
(void) strcpy(name, ivl_scope_tname(scope));
(void) strcat(name, "[");
(void) strcat(name, ivl_scope_name(scope));
(void) strcat(name, "]");
assert(name[len-1] == 0);
/* Emit the mangled name as an escaped identifier. */
fprintf(vlog_out, "\\%s ", name);
free(name);
} else {
emit_id(ivl_scope_tname(scope));
}
}
/*
* This function is called for each process in the design so that we
* can extract the processes for the given scope.
*/
static int find_process(ivl_process_t proc, ivl_scope_t scope)
{
if (scope == ivl_process_scope(proc)) emit_process(scope, proc);
return 0;
}
void emit_scope_variables(ivl_scope_t scope)
{
unsigned idx, count;
assert(! num_net_consts);
/* Output the parameters for this scope. */
count = ivl_scope_params(scope);
for (idx = 0; idx < count; idx += 1) {
ivl_parameter_t par = ivl_scope_param(scope, idx);
// vlog95 does not support type parameters. Places where type
// parameters have been used it will be replaced with the actual
// type that the module was instantiated with. Similar to
// typedefs.
if (ivl_parameter_is_type(par))
continue;
ivl_expr_t pex = ivl_parameter_expr(par);
fprintf(vlog_out, "%*cparameter ", indent, ' ');
emit_id(ivl_parameter_basename(par));
fprintf(vlog_out, " = ");
/* Need to emit the parameters value not its name. */
emitting_param = par;
emit_expr(scope, pex, ivl_parameter_width(par), 1, 0, 0);
emitting_param = 0;
fprintf(vlog_out, ";");
if (emit_file_line) {
fprintf(vlog_out, " /* %s:%u */",
ivl_parameter_file(par),
ivl_parameter_lineno(par));
}
fprintf(vlog_out, "\n");
}
if (count) fprintf(vlog_out, "\n");
/* Output the signals for this scope. */
count = ivl_scope_sigs(scope);
for (idx = 0; idx < count; idx += 1) {
ivl_signal_t sig = ivl_scope_sig(scope, idx);
if (ivl_signal_type(sig) == IVL_SIT_REG) {
/* Do not output the implicit function return register. */
if (ivl_scope_type(scope) == IVL_SCT_FUNCTION &&
strcmp(ivl_signal_basename(sig),
ivl_scope_tname(scope)) == 0) continue;
emit_var_def(sig);
} else {
emit_net_def(scope, sig);
}
}
if (count) fprintf(vlog_out, "\n");
/* Output the named events for this scope. */
count = ivl_scope_events(scope);
for (idx = 0; idx < count; idx += 1) {
ivl_event_t event = ivl_scope_event(scope, idx);
/* If this event has any type of edge sensitivity then it is
* not a named event. */
if (ivl_event_nany(event)) continue;
if (ivl_event_npos(event)) continue;
if (ivl_event_nneg(event)) continue;
fprintf(vlog_out, "%*cevent ", indent, ' ');
emit_id(ivl_event_basename(event));
fprintf(vlog_out, ";");
if (emit_file_line) {
fprintf(vlog_out, " /* %s:%u */",
ivl_event_file(event),
ivl_event_lineno(event));
}
fprintf(vlog_out, "\n");
}
if (count) fprintf(vlog_out, "\n");
if (emit_and_free_net_const_list(scope)) fprintf(vlog_out, "\n");
}
static void emit_scope_file_line(ivl_scope_t scope)
{
if (emit_file_line) {
fprintf(vlog_out, " /* %s:%u */",
ivl_scope_file(scope),
ivl_scope_lineno(scope));
}
}
static void emit_module_ports(ivl_scope_t scope)
{
unsigned idx, count = ivl_scope_ports(scope);
if (count == 0) return;
fprintf(vlog_out, "(");
emit_nexus_as_ca(scope, ivl_scope_mod_port(scope, 0), 0, 0);
for (idx = 1; idx < count; idx += 1) {
fprintf(vlog_out, ", ");
emit_nexus_as_ca(scope, ivl_scope_mod_port(scope, idx), 0, 0);
}
fprintf(vlog_out, ")");
}
static ivl_signal_t get_port_from_nexus(const ivl_scope_t scope, ivl_nexus_t nex,
unsigned *word)
{
assert(nex);
unsigned idx, count = ivl_nexus_ptrs(nex);
ivl_signal_t sig = 0;
*word = 0;
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) {
if (ivl_signal_scope(t_sig) != scope) continue;
assert(! sig);
sig = t_sig;
*word = ivl_nexus_ptr_pin(nex_ptr);
}
}
return sig;
}
static void emit_sig_type(ivl_signal_t sig)
{
ivl_signal_type_t type = ivl_signal_type(sig);
if (ivl_signal_dimensions(sig) != 0) {
fprintf(stderr, "%s:%u: vlog95 error: Array ports (%s) are not "
"supported.\n",
ivl_signal_file(sig),
ivl_signal_lineno(sig),
ivl_signal_basename(sig));
vlog_errors += 1;
}
/* Check to see if we have a variable (reg) or a net. */
if (type == IVL_SIT_REG) {
/* The variable data type will be declared later, so here
we just want to declare the range and whether or not it
is signed. */
if (ivl_signal_integer(sig)) {
/* nothing to do */
} else if (ivl_signal_data_type(sig) == IVL_VT_REAL) {
/* nothing to do */
} else {
int msb, lsb;
get_sig_msb_lsb(sig, &msb, &lsb);
if (ivl_signal_signed(sig)) {
if (allow_signed) {
fprintf(vlog_out, " signed");
} else {
fprintf(stderr, "%s:%u: vlog95 error: Signed "
"ports (%s) are not supported.\n",
ivl_signal_file(sig),
ivl_signal_lineno(sig),
ivl_signal_basename(sig));
vlog_errors += 1;
}
}
if (msb != 0 || lsb != 0) {
fprintf(vlog_out, " [%d:%d]", msb, lsb);
}
}
} else {
assert((type == IVL_SIT_TRI) ||
(type == IVL_SIT_TRI0) ||
(type == IVL_SIT_TRI1) ||
(type == IVL_SIT_UWIRE));
if (ivl_signal_data_type(sig) == IVL_VT_REAL) {
fprintf(stderr, "%s:%u: vlog95 error: Real net ports (%s) "
"are not supported.\n",
ivl_signal_file(sig),
ivl_signal_lineno(sig),
ivl_signal_basename(sig));
vlog_errors += 1;
} else {
int msb, lsb;
get_sig_msb_lsb(sig, &msb, &lsb);
if (ivl_signal_signed(sig)) {
if (allow_signed) {
fprintf(vlog_out, " signed");
} else {
fprintf(stderr, "%s:%u: vlog95 error: Signed net "
"ports (%s) are not supported.\n",
ivl_signal_file(sig),
ivl_signal_lineno(sig),
ivl_signal_basename(sig));
vlog_errors += 1;
}
}
if (msb != 0 || lsb != 0) {
fprintf(vlog_out, " [%d:%d]", msb, lsb);
}
}
}
}
static void emit_port(ivl_signal_t port)
{
assert(port);
fprintf(vlog_out, "%*c", indent, ' ');
switch (ivl_signal_port(port)) {
case IVL_SIP_INPUT:
fprintf(vlog_out, "input");
break;
case IVL_SIP_OUTPUT:
fprintf(vlog_out, "output");
break;
case IVL_SIP_INOUT:
fprintf(vlog_out, "inout");
break;
default:
fprintf(vlog_out, "<unknown>");
fprintf(stderr, "%s:%u: vlog95 error: Unknown port direction (%d) "
"for signal %s.\n", ivl_signal_file(port),
ivl_signal_lineno(port), (int)ivl_signal_port(port),
ivl_signal_basename(port));
vlog_errors += 1;
break;
}
emit_sig_type(port);
fprintf(vlog_out, " ");
/* Split port (arg[7:4],arg[3:0]) are generated using local signals. */
if (ivl_signal_local(port)) {
fprintf(vlog_out, "ivlog%s", ivl_signal_basename(port));
} else {
emit_id(ivl_signal_basename(port));
}
fprintf(vlog_out, ";");
emit_sig_file_line(port);
fprintf(vlog_out, "\n");
}
static void emit_module_port_defs(ivl_scope_t scope)
{
unsigned word, idx, count = ivl_scope_ports(scope);
for (idx = 0; idx < count; idx += 1) {
ivl_nexus_t nex = ivl_scope_mod_port(scope, idx);
ivl_signal_t port = get_port_from_nexus(scope, nex, &word);
// HERE: Do we need to use word?
if (port) emit_port(port);
else {
fprintf(vlog_out, "<missing>");
fprintf(stderr, "%s:%u: vlog95 error: Could not find signal "
"definition for port (%u) of module %s.\n",
ivl_scope_file(scope), ivl_scope_lineno(scope),
idx + 1, ivl_scope_basename(scope));
vlog_errors += 1;
}
}
if (count) fprintf(vlog_out, "\n");
}
static void emit_module_call_expr(ivl_scope_t scope, unsigned idx)
{
unsigned word;
ivl_nexus_t nex = ivl_scope_mod_port(scope, idx);
ivl_signal_t port = get_port_from_nexus(scope, nex, &word);
/* For an input port we need to emit the driving expression. */
if (ivl_signal_port(port) == IVL_SIP_INPUT) {
emit_nexus_port_driver_as_ca(ivl_scope_parent(scope),
ivl_signal_nex(port, word));
/* For an output we need to emit the signal the output is driving. */
} else {
emit_nexus_as_ca(ivl_scope_parent(scope),
ivl_signal_nex(port, word), 0, 0);
}
}
static void emit_module_call_expressions(ivl_scope_t scope)
{
unsigned idx, count = ivl_scope_ports(scope);
if (count == 0) return;
emit_module_call_expr(scope, 0);
for (idx = 1; idx < count; idx += 1) {
fprintf(vlog_out, ", ");
emit_module_call_expr(scope, idx);
}
}
static void emit_task_func_port_defs(ivl_scope_t scope)
{
unsigned idx, count = ivl_scope_ports(scope);
unsigned start = ivl_scope_type(scope) == IVL_SCT_FUNCTION;
for (idx = start; idx < count; idx += 1) {
ivl_signal_t port = ivl_scope_port(scope, idx);
emit_port(port);
}
/* If the start and count are both 1 then this is a SystemVerilog
* function that does not have an argument so add a dummy one. */
if ((start == 1) && (count == 1)) {
fprintf(vlog_out, "%*cinput _vlog95_dummy;", indent, ' ');
if (emit_file_line) fprintf(vlog_out, " /* no file/line */");
fprintf(vlog_out, "\n");
}
if (count) fprintf(vlog_out, "\n");
}
/*
* Recursively look for the named block in the given statement.
*/
static int has_named_block(ivl_scope_t scope, ivl_statement_t stmt)
{
unsigned idx, count;
int rtn = 0;
if (! stmt) return 0;
switch (ivl_statement_type(stmt)) {
/* Block or fork items can contain a named block. */
case IVL_ST_BLOCK:
case IVL_ST_FORK:
case IVL_ST_FORK_JOIN_ANY:
case IVL_ST_FORK_JOIN_NONE:
if (ivl_stmt_block_scope(stmt) == scope) return 1;
count = ivl_stmt_block_count(stmt);
for (idx = 0; (idx < count) && ! rtn ; idx += 1) {
rtn |= has_named_block(scope,
ivl_stmt_block_stmt(stmt, idx));
}
break;
/* Case items can contain a named block. */
case IVL_ST_CASE:
case IVL_ST_CASER:
case IVL_ST_CASEX:
case IVL_ST_CASEZ:
count = ivl_stmt_case_count(stmt);
for (idx = 0; (idx < count) && ! rtn; idx += 1) {
rtn |= has_named_block(scope,
ivl_stmt_case_stmt(stmt, idx));
}
break;
/* Either the true or false clause may have a named block. */
case IVL_ST_CONDIT:
rtn = has_named_block(scope, ivl_stmt_cond_true(stmt));
if (! rtn) {
rtn = has_named_block(scope, ivl_stmt_cond_false(stmt));
}
break;
/* The looping statements may have a named block. */
case IVL_ST_DO_WHILE:
case IVL_ST_FOREVER:
case IVL_ST_REPEAT:
case IVL_ST_WHILE:
/* The delay and wait statements may have a named block. */
case IVL_ST_DELAY:
case IVL_ST_DELAYX:
case IVL_ST_WAIT:
rtn = has_named_block(scope, ivl_stmt_sub_stmt(stmt));
break;
default: /* The rest cannot have a named block. */ ;
}
return rtn;
}
/*
* Look at all the processes to see if we can find one with the expected
* scope. If we don't find one then we can assume the block only has
* variable definitions and needs to be emitted here in the scope code.
*/
static int no_stmts_in_process(ivl_process_t proc, ivl_scope_t scope)
{
return has_named_block(scope, ivl_process_stmt(proc));
}
/*
* If a named block has no statements then we may need to emit it here if
* there are variable definitions in the scope. We translate all this to
* an initial and named begin since that is enough to hold the variables.
*/
static void emit_named_block_scope(ivl_scope_t scope)
{
unsigned idx, count = ivl_scope_events(scope);
unsigned named_ev = 0;
/* If there are no parameters, signals or named events then skip
* this block. */
for (idx = 0; idx < count; idx += 1) {
ivl_event_t event = ivl_scope_event(scope, idx);
/* If this event has any type of edge sensitivity then it is
* not a named event. */
if (ivl_event_nany(event)) continue;
if (ivl_event_npos(event)) continue;
if (ivl_event_nneg(event)) continue;
named_ev = 1;
break;
}
if ((ivl_scope_params(scope) == 0) && (ivl_scope_sigs(scope) == 0) &&
(named_ev == 0)) return;
/* Currently we only need to emit a named block for the variables
* if the parent scope is a module. This gets much more complicated
* if this is not true. */
if (ivl_scope_type(ivl_scope_parent(scope)) != IVL_SCT_MODULE) return;
/* Scan all the processes looking for one that matches this scope.
* If a match is found then this named block was already emitted by
* the process code. */
if (ivl_design_process(design, (ivl_process_f)no_stmts_in_process,
scope)) return;
/* A match was not found so emit the named block here to get the
* variable definitions. */
fprintf(vlog_out, "\n%*cinitial begin: ", indent, ' ');
emit_id(ivl_scope_tname(scope));
emit_scope_file_line(scope);
fprintf(vlog_out, "\n");
indent += indent_incr;
emit_scope_variables(scope);
indent -= indent_incr;
fprintf(vlog_out, "%*cend /* ", indent, ' ');
emit_id(ivl_scope_tname(scope));
fprintf(vlog_out, " */\n");
}
/*
* In SystemVerilog a task, function, or block can have a process to
* initialize variables. SystemVerilog requires this to be before the
* initial/always blocks are processed, but there's no way to express
* this in Verilog-95.
*/
static int find_tfb_process(ivl_process_t proc, ivl_scope_t scope)
{
if (scope == ivl_process_scope(proc)) {
ivl_scope_t mod_scope = scope;
/* A task or function or named block can only have initial
* processes that are used to set local variables. */
assert(ivl_process_type(proc) == IVL_PR_INITIAL);
/* Find the module scope for this task/function. */
while (ivl_scope_type(mod_scope) != IVL_SCT_MODULE &&
ivl_scope_type(mod_scope) != IVL_SCT_PACKAGE) {
mod_scope = ivl_scope_parent(mod_scope);
assert(mod_scope);
}
/* Emit the process in the module scope since that is where
* this all started. */
emit_process(mod_scope, proc);
}
return 0;
}
/*
* Emit any initial blocks for the tasks/functions/named blocks in a module.
*/
static int emit_tfb_process(ivl_scope_t scope, ivl_scope_t parent)
{
ivl_scope_type_t sc_type = ivl_scope_type(scope);
(void)parent; /* Parameter is not used. */
if ((sc_type == IVL_SCT_FUNCTION) || (sc_type == IVL_SCT_TASK) ||
(sc_type == IVL_SCT_BEGIN) || (sc_type == IVL_SCT_FORK)) {
/* Output the initial/always blocks for this module. */
ivl_design_process(design, (ivl_process_f)find_tfb_process, scope);
}
return 0;
}
static void emit_path_delay(ivl_scope_t scope, ivl_delaypath_t dpath)
{
unsigned idx, count = 6;
uint64_t pdlys [12];
pdlys[0] = ivl_path_delay(dpath, IVL_PE_01);
pdlys[1] = ivl_path_delay(dpath, IVL_PE_10);
pdlys[2] = ivl_path_delay(dpath, IVL_PE_0z);
pdlys[3] = ivl_path_delay(dpath, IVL_PE_z1);
pdlys[4] = ivl_path_delay(dpath, IVL_PE_1z);
pdlys[5] = ivl_path_delay(dpath, IVL_PE_z0);
pdlys[6] = ivl_path_delay(dpath, IVL_PE_0x);
pdlys[7] = ivl_path_delay(dpath, IVL_PE_x1);
pdlys[8] = ivl_path_delay(dpath, IVL_PE_1x);
pdlys[9] = ivl_path_delay(dpath, IVL_PE_x0);
pdlys[10] = ivl_path_delay(dpath, IVL_PE_xz);
pdlys[11] = ivl_path_delay(dpath, IVL_PE_zx);
/* If the first six pdlys match then this may be a 1 delay form. */
if ((pdlys[0] == pdlys[1]) &&
(pdlys[0] == pdlys[2]) &&
(pdlys[0] == pdlys[3]) &&
(pdlys[0] == pdlys[4]) &&
(pdlys[0] == pdlys[5])) count = 1;
/* Check to see if only a rise and fall value are given for the first
* six pdlys. */
else if ((pdlys[0] == pdlys[2]) &&
(pdlys[0] == pdlys[3]) &&
(pdlys[1] == pdlys[4]) &&
(pdlys[1] == pdlys[5])) count = 2;
/* Check to see if a rise, fall and high-Z value are given for the
* first six pdlys. */
else if ((pdlys[0] == pdlys[3]) &&
(pdlys[1] == pdlys[5]) &&
(pdlys[2] == pdlys[4])) count = 3;
/* Now check to see if the 'bx related pdlys match the reduced
* delay form. If not then this is a twelve delay value. */
if ((pdlys[6] != ((pdlys[0] < pdlys[2]) ? pdlys[0] : pdlys[2])) ||
(pdlys[8] != ((pdlys[1] < pdlys[4]) ? pdlys[1] : pdlys[4])) ||
(pdlys[11] != ((pdlys[3] < pdlys[5]) ? pdlys[3] : pdlys[5])) ||
(pdlys[7] != ((pdlys[0] > pdlys[3]) ? pdlys[0] : pdlys[3])) ||
(pdlys[9] != ((pdlys[1] > pdlys[5]) ? pdlys[1] : pdlys[5])) ||
(pdlys[10] != ((pdlys[2] > pdlys[4]) ? pdlys[2] : pdlys[4]))) {
count = 12;
}
emit_scaled_delay(scope, pdlys[0]);
for(idx = 1; idx < count; idx += 1) {
fprintf(vlog_out, ", ");
emit_scaled_delay(scope, pdlys[idx]);
}
}
static void emit_specify_paths(ivl_scope_t scope, ivl_signal_t sig)
{
unsigned idx, count = ivl_signal_npath(sig);
for(idx = 0; idx < count; idx += 1) {
ivl_delaypath_t dpath = ivl_signal_path(sig, idx);
ivl_nexus_t cond = ivl_path_condit(dpath);
ivl_nexus_t source = ivl_path_source(dpath);
unsigned has_edge = 0;
fprintf(vlog_out, "%*c", indent, ' ');
if (cond) {
fprintf(vlog_out, "if (");
emit_nexus_as_ca(scope, cond, 0, 0);
fprintf(vlog_out, ") ");
} else if (ivl_path_is_condit(dpath)) {
fprintf(vlog_out, "ifnone ");
}
fprintf(vlog_out, "(");
if (ivl_path_source_posedge(dpath)) {
fprintf(vlog_out, "posedge ");
has_edge = 1;
}
if (ivl_path_source_negedge(dpath)) {
fprintf(vlog_out, "negedge ");
has_edge = 1;
}
emit_nexus_as_ca(scope, source, 0, 0);
if (ivl_path_is_parallel(dpath)) {
fprintf(vlog_out, " =>");
} else {
fprintf(vlog_out, " *>");
}
/* The compiler does not keep the source expression for an edge
* sensitive path so add a constant to get the syntax right. */
if (has_edge) {
fprintf(vlog_out, "(%s : 1'bx /* Missing */)",
ivl_signal_basename(sig));
} else {
fprintf(vlog_out, "%s", ivl_signal_basename(sig));
}
fprintf(vlog_out, ") = (");
emit_path_delay(scope, dpath);
fprintf(vlog_out, ");\n");
}
}
/*
* The path delay information from the specify block is attached to the
* output ports.
*/
static void emit_specify(ivl_scope_t scope)
{
unsigned word, idx, count = ivl_scope_ports(scope);
unsigned need_specify = 0;
for (idx = 0; idx < count; idx += 1) {
ivl_nexus_t nex = ivl_scope_mod_port(scope, idx);
ivl_signal_t port = get_port_from_nexus(scope, nex, &word);
// HERE: Do we need to use word? See emit_module_port_def().
assert(port);
if (ivl_signal_npath(port)) {
if (! need_specify) {
fprintf(vlog_out, "\n%*cspecify\n", indent, ' ');
need_specify = 1;
indent += indent_incr;
}
emit_specify_paths(scope, port);
}
}
if (need_specify) {
indent -= indent_incr;
fprintf(vlog_out, "%*cendspecify\n", indent, ' ');
}
}
/*
* Look for a disable in the statement (function body) for this scope.
*/
static unsigned has_func_disable(ivl_scope_t scope, ivl_statement_t stmt)
{
unsigned idx, count, rtn = 0;
/* If there is a statement then look to see if it is or has a
* disable for this function scope. */
if (! stmt) return 0;
assert(ivl_scope_type(scope) == IVL_SCT_FUNCTION);
switch (ivl_statement_type(stmt)) {
/* These are not allowed in a function. */
case IVL_ST_ASSIGN_NB:
case IVL_ST_DELAY:
case IVL_ST_DELAYX:
case IVL_ST_FORK:
case IVL_ST_FORK_JOIN_ANY:
case IVL_ST_FORK_JOIN_NONE:
case IVL_ST_WAIT:
assert(0);
break;
/* These are allowed in a function and cannot have a disable. */
case IVL_ST_NOOP:
case IVL_ST_ALLOC:
case IVL_ST_ASSIGN:
case IVL_ST_BREAK:
case IVL_ST_CASSIGN:
case IVL_ST_CONTINUE:
case IVL_ST_DEASSIGN:
case IVL_ST_FORCE:
case IVL_ST_FREE:
case IVL_ST_RELEASE:
case IVL_ST_STASK:
case IVL_ST_UTASK: // this will be generated for a SV void function
case IVL_ST_TRIGGER:
case IVL_ST_NB_TRIGGER:
break;
/* Look for a disable in each block statement. */
case IVL_ST_BLOCK:
count = ivl_stmt_block_count(stmt);
for (idx = 0; (idx < count) && ! rtn; idx += 1) {
rtn |= has_func_disable(scope,
ivl_stmt_block_stmt(stmt, idx));
}
break;
/* Look for a disable in each case branch. */
case IVL_ST_CASE:
case IVL_ST_CASER:
case IVL_ST_CASEX:
case IVL_ST_CASEZ:
count = ivl_stmt_case_count(stmt);
for (idx = 0; (idx < count) && ! rtn; idx += 1) {
rtn |= has_func_disable(scope,
ivl_stmt_case_stmt(stmt, idx));
}
break;
/* Either the true or false clause may have a disable. */
case IVL_ST_CONDIT:
rtn = has_func_disable(scope, ivl_stmt_cond_true(stmt));
if (! rtn) {
rtn = has_func_disable(scope, ivl_stmt_cond_false(stmt));
}
break;
/* These have a single sub-statement so look for a disable there. */
case IVL_ST_DO_WHILE:
case IVL_ST_FOREVER:
case IVL_ST_FORLOOP:
case IVL_ST_REPEAT:
case IVL_ST_WHILE:
rtn = has_func_disable(scope, ivl_stmt_sub_stmt(stmt));
break;
/* The function has a disable if the disable scope matches the
* function scope. */
case IVL_ST_DISABLE:
rtn = scope == ivl_stmt_call(stmt);
break;
default:
fprintf(stderr, "%s:%u: vlog95 error: Unknown statement type (%d) "
"in function disable check.\n",
ivl_stmt_file(stmt),
ivl_stmt_lineno(stmt),
(int)ivl_statement_type(stmt));
vlog_errors += 1;
break;
}
return rtn;
}
/*
* This is the block name used when a SystemVerilog return is used in a
* function and the body does not already have an enclosing named block.
* This is needed since the actual function cannot be disabled.
*/
static char *get_func_return_name(ivl_scope_t scope)
{
const char *name_func = ivl_scope_basename(scope);
const char *name_head = "_ivl_";
const char *name_tail = "_return";
char *name_return;
name_return = (char *)malloc(strlen(name_head) +
strlen(name_func) +
strlen(name_tail) + 1);
name_return[0] = 0;
(void) strcpy(name_return, name_head);
(void) strcat(name_return, name_func);
(void) strcat(name_return, name_tail);
return name_return;
}
/*