forked from github/verilator
95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
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// -*- mode: C++; c-file-style: "cc-mode" -*-
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//*************************************************************************
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// DESCRIPTION: Verilator: Generate AstCReset nodes.
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//
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// Code available from: http://www.veripool.org/verilator
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//
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//*************************************************************************
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//
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// Copyright 2003-2016 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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// V3VarReset's Transformations:
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// Iterates over all modules and creates a _ctor_var_reset AstCFunc
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// For each variable that needs reset, add a AstCReset node.
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// This transformation honors outputSplitCFuncs.
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//*************************************************************************
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#include "config_build.h"
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#include "verilatedos.h"
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#include <cstdio>
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#include <cstdarg>
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#include <unistd.h>
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#include <cmath>
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#include <map>
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#include <vector>
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#include <algorithm>
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#include "V3Global.h"
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#include "V3VarResets.h"
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class V3VarReset {
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private:
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AstNodeModule* m_modp; // Current module
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AstCFunc* m_tlFuncp; // Top level function being built
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AstCFunc* m_funcp; // Current function
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int m_numStmts; // Number of statements output
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int m_funcNum; // Function number being built
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void initializeVar(AstVar* nodep) {
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if (v3Global.opt.outputSplitCFuncs()
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&& v3Global.opt.outputSplitCFuncs() < m_numStmts) {
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m_funcp = NULL;
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}
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if (!m_funcp) {
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m_funcp = new AstCFunc(m_modp->fileline(), "_ctor_var_reset_" + cvtToStr(++m_funcNum), NULL, "void");
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m_funcp->isStatic(false);
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m_funcp->declPrivate(true);
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m_funcp->slow(true);
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m_modp->addStmtp(m_funcp);
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// Add a top call to it
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AstCCall* callp = new AstCCall(m_modp->fileline(), m_funcp);
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m_tlFuncp->addStmtsp(callp);
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m_numStmts = 0;
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}
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m_funcp->addStmtsp(new AstCReset(nodep->fileline(), new AstVarRef(nodep->fileline(), nodep, true)));
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m_numStmts += 1;
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}
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public:
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V3VarReset(AstNodeModule* nodep) {
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m_modp = nodep;
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m_numStmts = 0;
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m_funcNum = 0;
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m_tlFuncp = new AstCFunc(nodep->fileline(), "_ctor_var_reset", NULL, "void");
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m_tlFuncp->declPrivate(true);
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m_tlFuncp->isStatic(false);
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m_tlFuncp->slow(true);
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m_funcp = m_tlFuncp;
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m_modp->addStmtp(m_tlFuncp);
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for (AstNode* np = m_modp->stmtsp(); np; np = np->nextp()) {
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AstVar* varp = np->castVar();
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if (varp) initializeVar(varp);
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}
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}
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};
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//######################################################################
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void V3VarResets::emitResets() {
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UINFO(2,__FUNCTION__<<": "<<endl);
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for (AstNodeModule* nodep = v3Global.rootp()->modulesp(); nodep; nodep=nodep->nextp()->castNodeModule()) {
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// Process each module in turn
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V3VarReset v(nodep);
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}
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}
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