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104 lines
3.4 KiB
C++
104 lines
3.4 KiB
C++
// -*- mode: C++; c-file-style: "cc-mode" -*-
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//*************************************************************************
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// DESCRIPTION: Verilator: Cleanup stage in V3Width
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//
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// Code available from: http://www.veripool.org/verilator
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//
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// AUTHORS: Wilson Snyder with Paul Wasson, Duane Gabli
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//
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//*************************************************************************
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//
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// Copyright 2003-2012 by Wilson Snyder. This program is free software; you can
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// redistribute it and/or modify it under the terms of either the GNU
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// Lesser General Public License Version 3 or the Perl Artistic License
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// Version 2.0.
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//
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// Verilator 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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//*************************************************************************
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#ifndef _V3WIDTHCOMMIT_H_
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#define _V3WIDTHCOMMIT_H_ 1
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#include "config_build.h"
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#include "verilatedos.h"
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#include "V3Error.h"
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#include "V3Ast.h"
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#ifndef _V3WIDTH_CPP_
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# error "V3WidthCommit for V3Width internal use only"
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#endif
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//######################################################################
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/// Remove all $signed, $unsigned, we're done with them.
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class WidthRemoveVisitor : public AstNVisitor {
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private:
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// VISITORS
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virtual void visit(AstSigned* nodep, AstNUser*) {
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replaceWithSignedVersion(nodep, nodep->lhsp()->unlinkFrBack()); nodep=NULL;
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}
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virtual void visit(AstUnsigned* nodep, AstNUser*) {
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replaceWithSignedVersion(nodep, nodep->lhsp()->unlinkFrBack()); nodep=NULL;
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}
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virtual void visit(AstNode* nodep, AstNUser*) {
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nodep->iterateChildren(*this);
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}
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void replaceWithSignedVersion(AstNode* nodep, AstNode* newp) {
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UINFO(6," Replace "<<nodep<<" w/ "<<newp<<endl);
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nodep->replaceWith(newp);
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newp->widthSignedFrom(nodep);
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pushDeletep(nodep); nodep=NULL;
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}
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public:
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// CONSTRUCTORS
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WidthRemoveVisitor() {}
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virtual ~WidthRemoveVisitor() {}
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AstNode* mainAcceptEdit(AstNode* nodep) {
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return nodep->acceptSubtreeReturnEdits(*this);
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}
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};
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//######################################################################
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class WidthCommitVisitor : public AstNVisitor {
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// Now that all widthing is complete,
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// Copy all width() to widthMin(). V3Const expects this
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private:
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// VISITORS
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virtual void visit(AstConst* nodep, AstNUser*) {
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nodep->width(nodep->width(),nodep->width());
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if ((nodep->width() != nodep->num().width()) || !nodep->num().sized()) {
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V3Number num (nodep->fileline(), nodep->width());
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num.opAssign(nodep->num());
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num.isSigned(nodep->isSigned());
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AstNode* newp = new AstConst(nodep->fileline(), num);
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nodep->replaceWith(newp);
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//if (debug()>4) nodep->dumpTree(cout," fixConstSize_old: ");
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//if (debug()>4) newp->dumpTree(cout," _new: ");
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pushDeletep(nodep); nodep=NULL;
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}
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}
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virtual void visit(AstNode* nodep, AstNUser*) {
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nodep->width(nodep->width(),nodep->width());
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nodep->iterateChildren(*this);
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}
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virtual void visit(AstNodePreSel* nodep, AstNUser*) {
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// This check could go anywhere after V3Param
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nodep->v3fatalSrc("Presels should have been removed before this point");
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}
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public:
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// CONSTUCTORS
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WidthCommitVisitor(AstNetlist* nodep) {
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nodep->accept(*this);
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}
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virtual ~WidthCommitVisitor() {}
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};
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//######################################################################
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#endif // Guard
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