515 lines
14 KiB
C++
515 lines
14 KiB
C++
/*
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* Copyright (c) 2000-2010 Stephen Williams (steve@icarus.com)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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# include "config.h"
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# include "PExpr.h"
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# include "compiler.h"
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# include "util.h"
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# include "netmisc.h"
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# include <cstdlib>
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# include <iostream>
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# include "ivl_assert.h"
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NetExpr*PExpr::elaborate_pexpr(Design*des, NetScope*sc) const
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{
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cerr << get_fileline() << ": error: invalid parameter expression: "
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<< *this << endl;
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des->errors += 1;
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return 0;
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}
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/*
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* Binary operators have sub-expressions that must be elaborated as
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* parameter expressions. If either of them fail, then give up. Once
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* they are taken care of, make the base object just as in any other
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* expression.
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*/
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NetExpr*PEBinary::elaborate_pexpr (Design*des, NetScope*scope) const
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{
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NetExpr*lp = left_->elaborate_pexpr(des, scope);
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NetExpr*rp = right_->elaborate_pexpr(des, scope);
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if ((lp == 0) || (rp == 0)) {
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delete lp;
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delete rp;
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return 0;
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}
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NetExpr*tmp = elaborate_expr_base_(des, lp, rp, -2, true);
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return tmp;
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}
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NetExpr*PEBComp::elaborate_pexpr(Design*des, NetScope*scope) const
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{
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NetExpr*lp = left_->elaborate_pexpr(des, scope);
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NetExpr*rp = right_->elaborate_pexpr(des, scope);
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if ((lp == 0) || (rp == 0)) {
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delete lp;
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delete rp;
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return 0;
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}
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NetEBComp*tmp = new NetEBComp(op_, lp, rp);
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tmp->set_line(*this);
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bool flag = tmp->set_width(1);
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if (flag == false) {
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cerr << get_fileline() << ": internal error: "
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"expression bit width of comparison != 1." << endl;
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des->errors += 1;
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}
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return tmp;
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}
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NetExpr*PEBLeftWidth::elaborate_pexpr (Design*des, NetScope*scope) const
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{
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NetExpr*lp = left_->elaborate_pexpr(des, scope);
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NetExpr*rp = right_->elaborate_pexpr(des, scope);
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if ((lp == 0) || (rp == 0)) {
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delete lp;
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delete rp;
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return 0;
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}
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NetExpr*tmp = elaborate_expr_leaf(des, lp, rp, -2);
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return tmp;
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}
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NetExpr*PEBLogic::elaborate_pexpr(Design*des, NetScope*scope) const
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{
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NetExpr*lp = left_->elaborate_pexpr(des, scope);
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NetExpr*rp = right_->elaborate_pexpr(des, scope);
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if ((lp == 0) || (rp == 0)) {
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delete lp;
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delete rp;
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return 0;
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}
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NetEBLogic*tmp = new NetEBLogic(op_, lp, rp);
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tmp->set_line(*this);
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bool flag = tmp->set_width(1);
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if (flag == false) {
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cerr << get_fileline() << ": internal error: "
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"expression bit width of comparison != 1." << endl;
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des->errors += 1;
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}
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return tmp;
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}
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/*
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* Event though parameters are not generally sized, parameter
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* expressions can include concatenation expressions. This requires
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* that the subexpressions all have well-defined size (in spite of
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* being in a parameter expression) in order to get a defined
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* value. The sub-expressions themselves must also be value parameter
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* expressions.
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*/
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NetEConcat* PEConcat::elaborate_pexpr(Design*des, NetScope*scope) const
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{
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NetExpr* repeat = 0;
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/* If there is a repeat expression, then evaluate the constant
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value and set the repeat count. */
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if (repeat_) {
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repeat = repeat_->elaborate_pexpr(des, scope);
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if (repeat == 0) {
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cerr << get_fileline() << ": error: "
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"concatenation repeat expression cannot be evaluated."
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<< endl;
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des->errors += 1;
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return 0;
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}
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/* continue on even if the repeat expression doesn't
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work, as we can find more errors. */
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}
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/* Make the empty concat expression. */
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NetEConcat*tmp = new NetEConcat(parms_.size(), repeat);
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tmp->set_line(*this);
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/* Elaborate all the operands and attach them to the concat
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node. Use the elaborate_pexpr method instead of the
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elaborate_expr method. */
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bool fail = false;
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for (unsigned idx = 0 ; idx < parms_.size() ; idx += 1) {
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assert(parms_[idx]);
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NetExpr*ex = parms_[idx]->elaborate_pexpr(des, scope);
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if (ex == 0) continue;
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if (ex->expr_type() == IVL_VT_REAL) {
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cerr << ex->get_fileline() << ": error: concatenation "
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<< "operand can not be real: " << *ex << endl;
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des->errors += 1;
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fail = true;
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continue;
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}
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ex->set_line(*parms_[idx]);
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if (dynamic_cast<NetEParam*>(ex)) {
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/* If this parameter is a NetEParam, then put off
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the width check for later. */
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} else if (! ex->has_width()) {
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cerr << ex->get_fileline() << ": error: operand of "
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<< "concatenation has indefinite width: "
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<< *ex << endl;
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des->errors += 1;
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fail = true;
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continue;
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}
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tmp->set(idx, ex);
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}
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if (fail) {
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delete tmp;
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return 0;
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}
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return tmp;
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}
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NetExpr*PEFNumber::elaborate_pexpr(Design*des, NetScope*scope) const
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{
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return elaborate_expr(des, scope, -1, false);
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}
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/*
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* Parameter expressions may reference other parameters, but only in
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* the current scope. Preserve the parameter reference in the
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* parameter expression I'm generating, instead of evaluating it now,
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* because the referenced parameter may yet be overridden.
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*/
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NetExpr*PEIdent::elaborate_pexpr(Design*des, NetScope*scope) const
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{
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pform_name_t oldpath = path_;
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name_component_t name_tail = path_.back();
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oldpath.pop_back();
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if (path_.size() > 1) {
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cerr << get_fileline() << ": error: parameter r-value expression "
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"does not support hierarchical references `" << path_
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<< "`." << endl;
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des->errors += 1;
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return 0;
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}
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NetScope*pscope = scope;
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if (path_.size() > 0) {
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list<hname_t> tmp = eval_scope_path(des, scope, oldpath);
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pscope = des->find_scope(scope, tmp);
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}
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const NetExpr*ex_msb;
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const NetExpr*ex_lsb;
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const NetExpr*ex = 0;
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// Look up the parameter name in the current scope. If the
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// name is not found in the pscope, look in containing scopes,
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// but do not go outside the containing module instance.
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for (;;) {
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ex = pscope->get_parameter(name_tail.name, ex_msb, ex_lsb);
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if (ex != 0)
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break;
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if (pscope->type() == NetScope::MODULE)
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break;
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pscope = pscope->parent();
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ivl_assert(*this, pscope);
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}
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if (ex == 0) {
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cerr << get_fileline() << ": error: identifier `"
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<< name_tail.name << "` is not a parameter in "
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<< scope_path(scope)<< "." << endl;
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des->errors += 1;
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return 0;
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}
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NetExpr*res = new NetEParam(des, pscope, name_tail.name);
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res->set_line(*this);
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assert(res);
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index_component_t::ctype_t use_sel = index_component_t::SEL_NONE;
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if (!name_tail.index.empty())
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use_sel = name_tail.index.back().sel;
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switch (use_sel) {
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case index_component_t::SEL_NONE:
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break;
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default:
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case index_component_t::SEL_PART:
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cerr << get_fileline() << ": sorry: Cannot part select "
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"bits of parameters." << endl;
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des->errors += 1;
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delete res;
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return 0;
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case index_component_t::SEL_BIT:
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/* We have here a bit select. Insert a NetESelect node
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to handle it. */
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NetExpr*tmp = name_tail.index.back().msb->elaborate_pexpr(des, scope);
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if (tmp == 0) {
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delete res;
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return 0;
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}
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if (debug_elaborate)
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cerr << get_fileline() << ": debug: "
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<< "Bit select [" << *tmp << "]"
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<< " in parameter expression." << endl;
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res = new NetESelect(res, tmp, 1);
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res->set_line(*this);
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break;
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}
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return res;
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}
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/*
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* Simple numbers can be elaborated by the elaborate_expr method.
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*/
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NetExpr*PENumber::elaborate_pexpr(Design*des, NetScope*sc) const
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{
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return elaborate_expr(des, sc, -1, false);
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}
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NetEConst* PEString::elaborate_pexpr(Design*des, NetScope*scope) const
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{
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return elaborate_expr(des, scope, -1, false);
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}
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NetETernary* PETernary::elaborate_pexpr(Design*des, NetScope*scope) const
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{
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NetExpr*c = expr_->elaborate_pexpr(des, scope);
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NetExpr*t = tru_->elaborate_pexpr(des, scope);
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NetExpr*f = fal_->elaborate_pexpr(des, scope);
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if (c == 0 || t == 0 || f == 0) return 0;
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NetETernary*tmp = new NetETernary(c, t, f);
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tmp->set_line(*this);
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return tmp;
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}
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NetExpr*PEUnary::elaborate_pexpr (Design*des, NetScope*scope) const
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{
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NetExpr*ip = expr_->elaborate_pexpr(des, scope);
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if (ip == 0) return 0;
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/* Should we evaluate expressions ahead of time,
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* just like in PEBinary::elaborate_expr() ?
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*/
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NetEUnary*tmp;
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switch (op_) {
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default:
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tmp = new NetEUnary(op_, ip);
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tmp->set_line(*this);
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break;
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case '~':
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tmp = new NetEUBits(op_, ip);
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tmp->set_line(*this);
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break;
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case '!': // Logical NOT
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case '&': // Reduction AND
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case '|': // Reduction OR
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case '^': // Reduction XOR
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case 'A': // Reduction NAND (~&)
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case 'N': // Reduction NOR (~|)
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case 'X': // Reduction NXOR (~^)
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tmp = new NetEUReduce(op_, ip);
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tmp->set_line(*this);
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break;
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}
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return tmp;
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}
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NetExpr* PECallFunction::elaborate_pexpr(Design*des, NetScope*scope) const
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{
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/* Only $clog2 and the builtin mathematical functions can
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* be a constant system function. */
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perm_string nm = peek_tail_name(path_);
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if (nm[0] == '$' && (generation_flag >= GN_VER2005 ||
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gn_icarus_misc_flag || gn_verilog_ams_flag)) {
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if (nm == "$clog2" ||
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nm == "$ln" ||
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nm == "$log10" ||
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nm == "$exp" ||
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nm == "$sqrt" ||
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nm == "$floor" ||
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nm == "$ceil" ||
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nm == "$sin" ||
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nm == "$cos" ||
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nm == "$tan" ||
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nm == "$asin" ||
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nm == "$acos" ||
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nm == "$atan" ||
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nm == "$sinh" ||
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nm == "$cosh" ||
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nm == "$tanh" ||
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nm == "$asinh" ||
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nm == "$acosh" ||
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nm == "$atanh") {
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if (parms_.size() != 1 || parms_[0] == 0) {
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cerr << get_fileline() << ": error: " << nm
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<< " takes a single argument." << endl;
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des->errors += 1;
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return 0;
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}
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NetExpr*arg = parms_[0]->elaborate_pexpr(des, scope);
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if (arg == 0) return 0;
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NetESFunc*rtn;
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if (nm == "$clog2") {
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rtn = new NetESFunc(nm, IVL_VT_BOOL, integer_width, 1);
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} else {
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rtn = new NetESFunc(nm, IVL_VT_REAL, 1, 1);
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}
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rtn->set_line(*this);
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rtn->cast_signed(true);
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rtn->parm(0, arg);
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return rtn;
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}
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if (nm == "$pow" ||
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nm == "$atan2" ||
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nm == "$hypot") {
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if (parms_.size() != 2 || parms_[0] == 0 || parms_[1] == 0) {
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cerr << get_fileline() << ": error: " << nm
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<< " takes two arguments." << endl;
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des->errors += 1;
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return 0;
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}
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NetExpr*arg0 = parms_[0]->elaborate_pexpr(des, scope);
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NetExpr*arg1 = parms_[1]->elaborate_pexpr(des, scope);
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if (arg0 == 0 || arg1 == 0) return 0;
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NetESFunc*rtn = new NetESFunc(nm, IVL_VT_REAL, 1, 2);
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rtn->set_line(*this);
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rtn->cast_signed(true);
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rtn->parm(0, arg0);
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rtn->parm(1, arg1);
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return rtn;
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}
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/* This is only available with verilog-ams or icarus-misc. */
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if ((gn_icarus_misc_flag || gn_verilog_ams_flag) &&
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(nm == "$abs")) {
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if (parms_.size() != 1 || parms_[0] == 0) {
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cerr << get_fileline() << ": error: " << nm
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<< " takes a single argument." << endl;
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des->errors += 1;
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return 0;
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}
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NetExpr*arg = parms_[0]->elaborate_pexpr(des, scope);
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if (arg == 0) return 0;
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NetESFunc*rtn;
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/* This can return either a real or an arbitrary
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* width vector, so set things to fail if this
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* does not get replaced with a constant during
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* elaboration. */
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rtn = new NetESFunc(nm, IVL_VT_NO_TYPE, 0, 1);
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rtn->set_line(*this);
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rtn->cast_signed(true);
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rtn->parm(0, arg);
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return rtn;
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}
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if ((gn_icarus_misc_flag || gn_verilog_ams_flag) &&
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(nm == "$min" || nm == "$max")) {
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if (parms_.size() != 2 || parms_[0] == 0 || parms_[1] == 0) {
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cerr << get_fileline() << ": error: " << nm
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<< " takes two arguments." << endl;
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des->errors += 1;
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return 0;
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}
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NetExpr*arg0 = parms_[0]->elaborate_pexpr(des, scope);
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NetExpr*arg1 = parms_[1]->elaborate_pexpr(des, scope);
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if (arg0 == 0 || arg1 == 0) return 0;
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/* See $abs above for why this has no type or width. */
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NetESFunc*rtn = new NetESFunc(nm, IVL_VT_NO_TYPE, 0, 2);
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rtn->set_line(*this);
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rtn->cast_signed(true);
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rtn->parm(0, arg0);
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rtn->parm(1, arg1);
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return rtn;
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}
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cerr << get_fileline() << ": error: " << nm << "() is not a "
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"constant system function." << endl;
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des->errors += 1;
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return 0;
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}
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/* Constant user function code goes here. */
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cerr << get_fileline() << ": sorry: constant user functions are not "
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"currently supported: " << nm << "()." << endl;
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des->errors += 1;
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return 0;
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}
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void NetExpr::resolve_pexpr_type(void)
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{
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}
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void NetEBinary::resolve_pexpr_type(void)
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{
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if (debug_elab_pexpr) {
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cerr << get_fileline() << ": debug: "
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<< "Resolve_pexpr_type for binary " << human_readable_op(op_)
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<< "." << endl;
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}
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left_->resolve_pexpr_type();
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right_->resolve_pexpr_type();
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switch (op_) {
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case '+':
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case '-':
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case '*':
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case '/':
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suppress_binary_operand_sign_if_needed(left_, right_);
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cast_signed_base_(left_->has_sign() && right_->has_sign());
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break;
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default:
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break;
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}
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}
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void NetEParam::resolve_pexpr_type(void)
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{
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if (debug_elab_pexpr) {
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cerr << get_fileline() << ": debug: "
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<< "Resolve_pexpr_type for parameter " << reference_->first
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<< "." << endl;
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}
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if (reference_->second.signed_flag) {
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cast_signed_base_(true);
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} else if (reference_->second.expr) {
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cast_signed_base_( reference_->second.expr->has_sign() );
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}
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}
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