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net_func_eval.cc
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/*
* Copyright (c) 2012-2024 Stephen Williams ([email protected])
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form 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 "netlist.h"
# include "netmisc.h"
# include "compiler.h"
# include <typeinfo>
# include "ivl_assert.h"
using namespace std;
/*
* We only evaluate one function at a time, so to support the disable
* statement, we just need to record the target block and then early
* terminate each enclosing block or loop statement until we get back
* to the target block.
*/
static const NetScope*disable = 0;
static bool loop_break;
static bool loop_continue;
static NetExpr* fix_assign_value(const NetNet*lhs, NetExpr*rhs)
{
NetEConst*ce = dynamic_cast<NetEConst*>(rhs);
if (ce == 0) return rhs;
unsigned lhs_width = lhs->vector_width();
unsigned rhs_width = rhs->expr_width();
if (rhs_width < lhs_width) {
rhs = pad_to_width(rhs, lhs_width, *rhs);
} else if (rhs_width > lhs_width) {
verinum value(ce->value(), lhs_width);
ce = new NetEConst(value);
ce->set_line(*rhs);
delete rhs;
rhs = ce;
}
rhs->cast_signed(lhs->get_signed());
return rhs;
}
NetExpr* NetFuncDef::evaluate_function(const LineInfo&loc, const std::vector<NetExpr*>&args) const
{
// Make the context map.
map<perm_string,LocalVar>::iterator ptr;
map<perm_string,LocalVar>context_map;
if (debug_eval_tree) {
cerr << loc.get_fileline() << ": NetFuncDef::evaluate_function: "
<< "Evaluate function " << scope()->basename() << endl;
}
// Put the return value into the map...
LocalVar&return_var = context_map[scope()->basename()];
return_var.nwords = 0;
return_var.value = 0;
// Load the input ports into the map...
ivl_assert(loc, port_count() == args.size());
for (size_t idx = 0 ; idx < port_count() ; idx += 1) {
const NetNet*pnet = port(idx);
perm_string aname = pnet->name();
LocalVar&input_var = context_map[aname];
input_var.nwords = 0;
input_var.value = fix_assign_value(pnet, args[idx]);
if (debug_eval_tree) {
cerr << loc.get_fileline() << ": NetFuncDef::evaluate_function: "
<< " input " << aname << " = " << *args[idx] << endl;
}
}
// Ask the scope to collect definitions for local values. This
// fills in the context_map with local variables held by the scope.
scope()->evaluate_function_find_locals(loc, context_map);
// Execute any variable initialization statements.
if (const NetProc*init_proc = scope()->var_init())
init_proc->evaluate_function(loc, context_map);
if (debug_eval_tree && proc_==0) {
cerr << loc.get_fileline() << ": NetFuncDef::evaluate_function: "
<< "Function " << scope_path(scope())
<< " has no statement?" << endl;
}
// Perform the evaluation. Note that if there were errors
// when compiling the function definition, we may not have
// a valid statement.
bool flag = proc_ && proc_->evaluate_function(loc, context_map);
if (debug_eval_tree && !flag) {
cerr << loc.get_fileline() << ": NetFuncDef::evaluate_function: "
<< "Cannot evaluate " << scope_path(scope()) << "." << endl;
}
// Extract the result...
ptr = context_map.find(scope()->basename());
NetExpr*res = ptr->second.value;
context_map.erase(ptr);
// Cleanup the rest of the context.
for (ptr = context_map.begin() ; ptr != context_map.end() ; ++ptr) {
unsigned nwords = ptr->second.nwords;
if (nwords > 0) {
NetExpr**array = ptr->second.array;
for (unsigned idx = 0 ; idx < nwords ; idx += 1) {
delete array[idx];
}
delete [] ptr->second.array;
} else {
delete ptr->second.value;
}
}
if (disable) {
if (debug_eval_tree)
cerr << loc.get_fileline() << ": NetFuncDef::evaluate_function: "
<< "disable of " << scope_path(disable)
<< " trapped in function " << scope_path(scope())
<< "." << endl;
ivl_assert(loc, disable==scope());
disable = 0;
}
// Done.
if (flag) {
if (debug_eval_tree) {
cerr << loc.get_fileline() << ": NetFuncDef::evaluate_function: "
<< "Evaluated to ";
if (res) cerr << *res;
else cerr << "<nil>";
cerr << endl;
}
return res;
}
if (debug_eval_tree) {
cerr << loc.get_fileline() << ": NetFuncDef::evaluate_function: "
<< "Evaluation failed." << endl;
}
delete res;
return 0;
}
void NetScope::evaluate_function_find_locals(const LineInfo&loc,
map<perm_string,LocalVar>&context_map) const
{
for (map<perm_string,NetNet*>::const_iterator cur = signals_map_.begin()
; cur != signals_map_.end() ; ++cur) {
const NetNet*tmp = cur->second;
// Skip ports, which are handled elsewhere.
if (tmp->port_type() != NetNet::NOT_A_PORT)
continue;
unsigned nwords = 0;
if (tmp->unpacked_dimensions() > 0)
nwords = tmp->unpacked_count();
LocalVar&local_var = context_map[tmp->name()];
local_var.nwords = nwords;
if (nwords > 0) {
NetExpr**array = new NetExpr*[nwords];
for (unsigned idx = 0 ; idx < nwords ; idx += 1) {
array[idx] = 0;
}
local_var.array = array;
} else {
local_var.value = 0;
}
if (debug_eval_tree) {
cerr << loc.get_fileline() << ": debug: "
<< " (local) " << tmp->name()
<< (nwords > 0 ? "[]" : "") << endl;
}
}
}
NetExpr* NetExpr::evaluate_function(const LineInfo&,
map<perm_string,LocalVar>&) const
{
cerr << get_fileline() << ": sorry: I don't know how to evaluate this expression at compile time." << endl;
cerr << get_fileline() << ": : Expression type:" << typeid(*this).name() << endl;
return 0;
}
bool NetProc::evaluate_function(const LineInfo&,
map<perm_string,LocalVar>&) const
{
cerr << get_fileline() << ": sorry: I don't know how to evaluate this statement at compile time." << endl;
cerr << get_fileline() << ": : Statement type:" << typeid(*this).name() << endl;
return false;
}
void NetAssign::eval_func_lval_op_real_(const LineInfo&loc,
verireal&lv, const verireal&rv) const
{
switch (op_) {
case '+':
lv = lv + rv;
break;
case '-':
lv = lv - rv;
break;
case '*':
lv = lv * rv;
break;
case '/':
lv = lv / rv;
break;
case '%':
lv = lv % rv;
break;
default:
cerr << "Illegal assignment operator: "
<< human_readable_op(op_) << endl;
ivl_assert(loc, 0);
}
}
void NetAssign::eval_func_lval_op_(const LineInfo&loc,
verinum&lv, verinum&rv) const
{
unsigned lv_width = lv.len();
bool lv_sign = lv.has_sign();
switch (op_) {
case 'l':
case 'R':
// The left operand is self-determined.
break;
case 'r':
// The left operand is self-determined, but we need to
// cast it to unsigned to get a logical shift.
lv.has_sign(false);
break;
default:
// The left operand must be cast to the expression type/size
lv.has_sign(rv.has_sign());
lv = cast_to_width(lv, rv.len());
}
switch (op_) {
case '+':
lv = lv + rv;
break;
case '-':
lv = lv - rv;
break;
case '*':
lv = lv * rv;
break;
case '/':
lv = lv / rv;
break;
case '%':
lv = lv % rv;
break;
case '&':
for (unsigned idx = 0 ; idx < lv.len() ; idx += 1)
lv.set(idx, lv[idx] & rv[idx]);
break;
case '|':
for (unsigned idx = 0 ; idx < lv.len() ; idx += 1)
lv.set(idx, lv[idx] | rv[idx]);
break;
case '^':
for (unsigned idx = 0 ; idx < lv.len() ; idx += 1)
lv.set(idx, lv[idx] ^ rv[idx]);
break;
case 'l':
lv = lv << rv.as_unsigned();
break;
case 'r':
lv = lv >> rv.as_unsigned();
break;
case 'R':
lv = lv >> rv.as_unsigned();
break;
default:
cerr << "Illegal assignment operator: "
<< human_readable_op(op_) << endl;
ivl_assert(loc, 0);
}
lv = cast_to_width(lv, lv_width);
lv.has_sign(lv_sign);
}
bool NetAssign::eval_func_lval_(const LineInfo&loc,
map<perm_string,LocalVar>&context_map,
const NetAssign_*lval, NetExpr*rval_result) const
{
map<perm_string,LocalVar>::iterator ptr = context_map.find(lval->name());
ivl_assert(*this, ptr != context_map.end());
LocalVar*var = & ptr->second;
while (var->nwords == -1) {
ivl_assert(*this, var->ref);
var = var->ref;
}
NetExpr*old_lval;
int word = 0;
if (var->nwords > 0) {
NetExpr*word_result = lval->word()->evaluate_function(loc, context_map);
if (word_result == 0) {
delete rval_result;
return false;
}
NetEConst*word_const = dynamic_cast<NetEConst*>(word_result);
ivl_assert(loc, word_const);
if (!word_const->value().is_defined())
return true;
word = word_const->value().as_long();
if (word < 0 || word >= var->nwords)
return true;
old_lval = var->array[word];
} else {
ivl_assert(*this, var->nwords == 0);
old_lval = var->value;
}
if (const NetExpr*base_expr = lval->get_base()) {
NetExpr*base_result = base_expr->evaluate_function(loc, context_map);
if (base_result == 0) {
delete rval_result;
return false;
}
NetEConst*base_const = dynamic_cast<NetEConst*>(base_result);
ivl_assert(loc, base_const);
long base = base_const->value().as_long();
if (old_lval == 0)
old_lval = make_const_x(lval->sig()->vector_width());
NetEConst*lval_const = dynamic_cast<NetEConst*>(old_lval);
ivl_assert(loc, lval_const);
verinum lval_v = lval_const->value();
NetEConst*rval_const = dynamic_cast<NetEConst*>(rval_result);
ivl_assert(loc, rval_const);
verinum rval_v = rval_const->value();
verinum lpart(verinum::Vx, lval->lwidth());
if (op_) {
for (unsigned idx = 0 ; idx < lpart.len() ; idx += 1) {
long ldx = base + idx;
if (ldx >= 0 && ldx < lval_v.len())
lpart.set(idx, lval_v[ldx]);
}
eval_func_lval_op_(loc, lpart, rval_v);
} else {
lpart = cast_to_width(rval_v, lval->lwidth());
}
for (unsigned idx = 0 ; idx < lpart.len() ; idx += 1) {
long ldx = base + idx;
if (ldx >= 0 && ldx < lval_v.len())
lval_v.set(idx+base, lpart[idx]);
}
delete base_result;
delete rval_result;
rval_result = new NetEConst(lval_v);
} else {
if (op_ == 0) {
rval_result = fix_assign_value(lval->sig(), rval_result);
} else if (dynamic_cast<NetECReal*>(rval_result)) {
NetECReal*lval_const = dynamic_cast<NetECReal*>(old_lval);
ivl_assert(loc, lval_const);
verireal lval_r = lval_const->value();
NetECReal*rval_const = dynamic_cast<NetECReal*>(rval_result);
ivl_assert(loc, rval_const);
verireal rval_r = rval_const->value();
eval_func_lval_op_real_(loc, lval_r, rval_r);
delete rval_result;
rval_result = new NetECReal(lval_r);
} else {
NetEConst*lval_const = dynamic_cast<NetEConst*>(old_lval);
ivl_assert(loc, lval_const);
verinum lval_v = lval_const->value();
NetEConst*rval_const = dynamic_cast<NetEConst*>(rval_result);
ivl_assert(loc, rval_const);
verinum rval_v = rval_const->value();
eval_func_lval_op_(loc, lval_v, rval_v);
delete rval_result;
rval_result = new NetEConst(lval_v);
}
}
if (old_lval)
delete old_lval;
if (debug_eval_tree) {
cerr << get_fileline() << ": NetAssign::evaluate_function: "
<< lval->name() << " = " << *rval_result << endl;
}
if (var->nwords > 0) {
var->array[word] = rval_result;
} else {
ivl_assert(*this, var->nwords == 0);
var->value = rval_result;
}
return true;
}
bool NetAssign::evaluate_function(const LineInfo&loc,
map<perm_string,LocalVar>&context_map) const
{
// Evaluate the r-value expression.
const NetExpr*use_rval = rval();
if (use_rval == 0)
return false;
NetExpr*rval_result = use_rval->evaluate_function(loc, context_map);
if (rval_result == 0)
return false;
// Handle the easy case of a single variable on the LHS.
if (l_val_count() == 1)
return eval_func_lval_(loc, context_map, l_val(0), rval_result);
// If we get here, the LHS must be a concatenation, so we
// expect the RHS to be a vector value.
NetEConst*rval_const = dynamic_cast<NetEConst*>(rval_result);
ivl_assert(*this, rval_const);
if (op_) {
cerr << get_fileline() << ": sorry: Assignment operators "
"inside a constant function are not currently "
"supported if the LHS is a concatenation." << endl;
return false;
}
verinum rval_full = rval_const->value();
delete rval_result;
unsigned base = 0;
for (unsigned ldx = 0 ; ldx < l_val_count() ; ldx += 1) {
const NetAssign_*lval = l_val(ldx);
verinum rval_part(verinum::Vx, lval->lwidth());
for (unsigned idx = 0 ; idx < rval_part.len() ; idx += 1)
rval_part.set(idx, rval_full[base+idx]);
bool flag = eval_func_lval_(loc, context_map, lval,
new NetEConst(rval_part));
if (!flag) return false;
base += lval->lwidth();
}
return true;
}
/*
* Evaluating a NetBlock in a function is a simple matter of
* evaluating the statements in order.
*/
bool NetBlock::evaluate_function(const LineInfo&loc,
map<perm_string,LocalVar>&context_map) const
{
if (last_ == 0) return true;
// If we need to make a local scope, then this context map
// will be filled in and used for statements within this block.
map<perm_string,LocalVar>local_context_map;
bool use_local_context_map = false;
if (subscope_!=0) {
// First, copy the containing scope symbols into the new
// scope as references.
for (map<perm_string,LocalVar>::iterator cur = context_map.begin()
; cur != context_map.end() ; ++cur) {
LocalVar&cur_var = local_context_map[cur->first];
cur_var.nwords = -1;
if (cur->second.nwords == -1)
cur_var.ref = cur->second.ref;
else
cur_var.ref = &cur->second;
}
// Now collect the new locals.
subscope_->evaluate_function_find_locals(loc, local_context_map);
use_local_context_map = true;
// Execute any variable initialization statements.
if (const NetProc*init_proc = subscope_->var_init())
init_proc->evaluate_function(loc, local_context_map);
}
// Now use the local context map if there is any local
// context, or the containing context map.
map<perm_string,LocalVar>&use_context_map = use_local_context_map? local_context_map : context_map;
bool flag = true;
NetProc*cur = last_;
do {
cur = cur->next_;
if (debug_eval_tree) {
cerr << get_fileline() << ": NetBlock::evaluate_function: "
<< "Execute statement (" << typeid(*cur).name()
<< ") at " << cur->get_fileline() << "." << endl;
}
bool cur_flag = cur->evaluate_function(loc, use_context_map);
flag = flag && cur_flag;
} while (cur != last_ && !disable && !loop_break && !loop_continue);
if (debug_eval_tree) {
cerr << get_fileline() << ": NetBlock::evaluate_function: "
<< "subscope_=" << subscope_
<< ", disable=" << disable
<< ", flag=" << (flag?"true":"false") << endl;
}
if (disable == subscope_) disable = 0;
return flag;
}
bool NetCase::evaluate_function_vect_(const LineInfo&loc,
map<perm_string,LocalVar>&context_map) const
{
NetExpr*case_expr = expr_->evaluate_function(loc, context_map);
if (case_expr == 0)
return false;
NetEConst*case_const = dynamic_cast<NetEConst*> (case_expr);
ivl_assert(loc, case_const);
verinum case_val = case_const->value();
delete case_expr;
NetProc*default_statement = 0;
for (unsigned cnt = 0 ; cnt < items_.size() ; cnt += 1) {
const Item*item = &items_[cnt];
if (item->guard == 0) {
default_statement = item->statement;
continue;
}
NetExpr*item_expr = item->guard->evaluate_function(loc, context_map);
if (item_expr == 0)
return false;
NetEConst*item_const = dynamic_cast<NetEConst*> (item_expr);
ivl_assert(loc, item_const);
verinum item_val = item_const->value();
delete item_expr;
ivl_assert(loc, item_val.len() == case_val.len());
bool match = true;
for (unsigned idx = 0 ; idx < item_val.len() ; idx += 1) {
verinum::V bit_a = case_val.get(idx);
verinum::V bit_b = item_val.get(idx);
if (bit_a == verinum::Vx && type_ == EQX) continue;
if (bit_b == verinum::Vx && type_ == EQX) continue;
if (bit_a == verinum::Vz && type_ != EQ) continue;
if (bit_b == verinum::Vz && type_ != EQ) continue;
if (bit_a != bit_b) {
match = false;
break;
}
}
if (!match) continue;
return item->statement->evaluate_function(loc, context_map);
}
if (default_statement)
return default_statement->evaluate_function(loc, context_map);
return true;
}
bool NetCase::evaluate_function_real_(const LineInfo&loc,
map<perm_string,LocalVar>&context_map) const
{
NetExpr*case_expr = expr_->evaluate_function(loc, context_map);
if (case_expr == 0)
return false;
NetECReal*case_const = dynamic_cast<NetECReal*> (case_expr);
ivl_assert(loc, case_const);
double case_val = case_const->value().as_double();
delete case_expr;
NetProc*default_statement = 0;
for (unsigned cnt = 0 ; cnt < items_.size() ; cnt += 1) {
const Item*item = &items_[cnt];
if (item->guard == 0) {
default_statement = item->statement;
continue;
}
NetExpr*item_expr = item->guard->evaluate_function(loc, context_map);
if (item_expr == 0)
return false;
NetECReal*item_const = dynamic_cast<NetECReal*> (item_expr);
ivl_assert(loc, item_const);
double item_val = item_const->value().as_double();
delete item_expr;
if (item_val != case_val) continue;
return item->statement->evaluate_function(loc, context_map);
}
if (default_statement)
return default_statement->evaluate_function(loc, context_map);
return true;
}
bool NetCase::evaluate_function(const LineInfo&loc,
map<perm_string,LocalVar>&context_map) const
{
if (expr_->expr_type() == IVL_VT_REAL)
return evaluate_function_real_(loc, context_map);
else
return evaluate_function_vect_(loc, context_map);
}
bool NetCondit::evaluate_function(const LineInfo&loc,
map<perm_string,LocalVar>&context_map) const
{
NetExpr*cond = expr_->evaluate_function(loc, context_map);
if (cond == 0) {
if (debug_eval_tree) {
cerr << get_fileline() << ": NetCondit::evaluate_function: "
<< "Unable to evaluate condition (" << *expr_ <<")" << endl;
}
return false;
}
NetEConst*cond_const = dynamic_cast<NetEConst*> (cond);
ivl_assert(loc, cond_const);
long val = cond_const->value().as_long();
delete cond;
bool flag;
if (val)
// The condition is true, so evaluate the if clause
flag = (if_ == 0) || if_->evaluate_function(loc, context_map);
else
// The condition is false, so evaluate the else clause
flag = (else_ == 0) || else_->evaluate_function(loc, context_map);
if (debug_eval_tree) {
cerr << get_fileline() << ": NetCondit::evaluate_function: "
<< "Finished, flag=" << (flag?"true":"false") << endl;
}
return flag;
}
bool NetDisable::evaluate_function(const LineInfo&,
map<perm_string,LocalVar>&) const
{
disable = target_;
if (debug_eval_tree) {
cerr << get_fileline() << ": NetDisable::evaluate_function: "
<< "disable " << scope_path(disable) << endl;
}
return true;
}
bool NetBreak::evaluate_function(const LineInfo&,
map<perm_string, LocalVar>&) const
{
loop_break = true;
if (debug_eval_tree) {
cerr << get_fileline() << ": NetBreak::evaluate_function" << endl;
}
return true;
}
bool NetContinue::evaluate_function(const LineInfo&,
map<perm_string, LocalVar>&) const
{
loop_continue = true;
if (debug_eval_tree) {
cerr << get_fileline() << ": NetContinue::evaluate_function" << endl;
}
return true;
}
bool NetDoWhile::evaluate_function(const LineInfo&loc,
map<perm_string,LocalVar>&context_map) const
{
bool flag = true;
if (debug_eval_tree) {
cerr << get_fileline() << ": NetDoWhile::evaluate_function: "
<< "Start loop" << endl;
}
while (!disable) {
// Evaluate the statement.
flag = proc_->evaluate_function(loc, context_map);
if (! flag)
break;
if (loop_break) {
loop_break = false;
break;
}
loop_continue = false;
// Evaluate the condition expression to try and get the
// condition for the loop.
NetExpr*cond = cond_->evaluate_function(loc, context_map);
if (cond == 0) {
flag = false;
break;
}
NetEConst*cond_const = dynamic_cast<NetEConst*> (cond);
ivl_assert(loc, cond_const);
long val = cond_const->value().as_long();
delete cond;
// If the condition is false, then the loop is done.
if (val == 0)
break;
}
if (debug_eval_tree) {
cerr << get_fileline() << ": NetDoWhile::evaluate_function: "
<< "Done loop, flag=" << (flag?"true":"false") << endl;
}
return flag;
}
bool NetForever::evaluate_function(const LineInfo&loc,
map<perm_string,LocalVar>&context_map) const
{
bool flag = true;
if (debug_eval_tree) {
cerr << get_fileline() << ": debug: NetForever::evaluate_function: "
<< "Start loop" << endl;
}
while (flag && !disable) {
flag = flag && statement_->evaluate_function(loc, context_map);
if (loop_break) {
loop_break = false;
break;
}
loop_continue = false;
}
if (debug_eval_tree) {
cerr << get_fileline() << ": debug: NetForever::evaluate_function: "
<< "Done loop" << endl;
}
return flag;
}
/*
* Process the for-loop to generate a value, as if this were in a function.
*/
bool NetForLoop::evaluate_function(const LineInfo&loc,
map<perm_string,LocalVar>&context_map) const
{
bool flag = true;
if (debug_eval_tree) {
cerr << get_fileline() << ": NetForLoop::evaluate_function: "
<< "Evaluate the for look as a function." << endl;
}
if (init_statement_) {
bool tmp_flag = init_statement_->evaluate_function(loc, context_map);
flag &= tmp_flag;
}
while (flag && !disable) {
if (condition_) {
// Evaluate the condition expression to try and get the
// condition for the loop.
NetExpr*cond = condition_->evaluate_function(loc, context_map);
if (cond == nullptr) {
flag = false;
break;
}
NetEConst*cond_const = dynamic_cast<NetEConst*> (cond);
ivl_assert(loc, cond_const);
long val = cond_const->value().as_long();
delete cond;
// If the condition is false, then break;
if (val == 0)
break;
}
bool tmp_flag = statement_->evaluate_function(loc, context_map);
flag &= tmp_flag;
if (disable)
break;
if (loop_break) {
loop_break = false;
break;
}
loop_continue = false;
if (step_statement_) {
tmp_flag = step_statement_->evaluate_function(loc, context_map);
flag &= tmp_flag;
}
}
if (debug_eval_tree) {
cerr << get_fileline() << ": NetForLoop::evaluate_function: "
<< "Done for-loop, flag=" << (flag?"true":"false") << endl;
}
return flag;
}
bool NetRepeat::evaluate_function(const LineInfo&loc,
map<perm_string,LocalVar>&context_map) const
{
bool flag = true;
// Evaluate the condition expression to try and get the
// condition for the loop.
NetExpr*count_expr = expr_->evaluate_function(loc, context_map);
if (count_expr == 0) return false;
NetEConst*count_const = dynamic_cast<NetEConst*> (count_expr);
ivl_assert(loc, count_const);
long count = count_const->value().as_long();
delete count_expr;
if (debug_eval_tree) {
cerr << get_fileline() << ": debug: NetRepeat::evaluate_function: "
<< "Repeating " << count << " times." << endl;
}
while ((count > 0) && flag && !disable) {
flag = flag && statement_->evaluate_function(loc, context_map);
count -= 1;
if (loop_break) {
loop_break = false;
break;
}
loop_continue = false;
}
if (debug_eval_tree) {
cerr << get_fileline() << ": debug: NetRepeat::evaluate_function: "
<< "Finished loop" << endl;
}
return flag;
}
bool NetSTask::evaluate_function(const LineInfo&,
map<perm_string,LocalVar>&) const
{
// system tasks within a constant function are ignored
return true;
}
bool NetWhile::evaluate_function(const LineInfo&loc,
map<perm_string,LocalVar>&context_map) const
{
bool flag = true;
if (debug_eval_tree) {
cerr << get_fileline() << ": NetWhile::evaluate_function: "
<< "Start loop" << endl;
}
while (flag && !disable) {
// Evaluate the condition expression to try and get the
// condition for the loop.
NetExpr*cond = cond_->evaluate_function(loc, context_map);
if (cond == 0) {
flag = false;
break;
}
NetEConst*cond_const = dynamic_cast<NetEConst*> (cond);
ivl_assert(loc, cond_const);
long val = cond_const->value().as_long();
delete cond;
// If the condition is false, then break.
if (val == 0)
break;
// The condition is true, so evaluate the statement
// another time.
bool tmp_flag = proc_->evaluate_function(loc, context_map);
if (! tmp_flag)
flag = false;
if (loop_break) {
loop_break = false;
break;
}
loop_continue = false;
}
if (debug_eval_tree) {
cerr << get_fileline() << ": NetWhile::evaluate_function: "
<< "Done loop, flag=" << (flag?"true":"false") << endl;
}
return flag;
}
NetExpr* NetEBinary::evaluate_function(const LineInfo&loc,
map<perm_string,LocalVar>&context_map) const
{
NetExpr*lval = left_->evaluate_function(loc, context_map);
NetExpr*rval = right_->evaluate_function(loc, context_map);
if (lval == 0 || rval == 0) {
delete lval;
delete rval;
return 0;
}
NetExpr*res = eval_arguments_(lval, rval);
delete lval;
delete rval;
return res;
}