mirror of
https://github.com/verilator/verilator.git
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326 lines
12 KiB
C++
326 lines
12 KiB
C++
// -*- mode: C++; c-file-style: "cc-mode" -*-
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//*************************************************************************
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// DESCRIPTION: Verilator: Parse module/signal name references
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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 2003-2013 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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// LinkParse TRANSFORMATIONS:
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// Top-down traversal
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// Move some attributes around
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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 <map>
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#include <set>
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#include <algorithm>
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#include <vector>
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#include "V3Global.h"
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#include "V3LinkParse.h"
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#include "V3Ast.h"
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//######################################################################
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// Link state, as a visitor of each AstNode
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class LinkParseVisitor : public AstNVisitor {
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private:
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// NODE STATE
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// Cleared on netlist
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// AstNode::user1() -> bool. True if processed
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// AstNode::user2() -> bool. True if fileline recomputed
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AstUser1InUse m_inuser1;
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AstUser2InUse m_inuser2;
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// TYPES
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typedef map <pair<void*,string>,AstTypedef*> ImplTypedefMap;
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typedef set <FileLine*> FileLineSet;
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// STATE
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AstVar* m_varp; // Variable we're under
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ImplTypedefMap m_implTypedef; // Created typedefs for each <container,name>
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FileLineSet m_filelines; // Filelines that have been seen
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bool m_inAlways; // Inside an always
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bool m_inGenerate; // Inside a generate
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bool m_needStart; // Need start marker on lower AstParse
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AstNodeModule* m_valueModp; // If set, move AstVar->valuep() initial values to this module
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AstNodeModule* m_modp; // Current module
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// METHODS
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static int debug() {
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static int level = -1;
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if (VL_UNLIKELY(level < 0)) level = v3Global.opt.debugSrcLevel(__FILE__);
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return level;
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}
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void cleanFileline(AstNode* nodep) {
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if (!nodep->user2SetOnce()) { // Process once
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// We make all filelines unique per AstNode. This allows us to
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// later turn off messages on a fileline when an issue is found
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// so that messages on replicated blocks occur only once,
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// without suppressing other token's messages as a side effect.
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// We could have verilog.l create a new one on every token,
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// but that's a lot more structures than only doing AST nodes.
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if (m_filelines.find(nodep->fileline()) != m_filelines.end()) {
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nodep->fileline(new FileLine(nodep->fileline()));
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}
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m_filelines.insert(nodep->fileline());
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}
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}
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// VISITs
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virtual void visit(AstNodeFTaskRef* nodep, AstNUser*) {
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if (!nodep->user1SetOnce()) { // Process only once.
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cleanFileline(nodep);
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UINFO(5," "<<nodep<<endl);
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AstNodeModule* upperValueModp = m_valueModp;
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m_valueModp = NULL;
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nodep->iterateChildren(*this);
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m_valueModp = upperValueModp;
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}
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}
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virtual void visit(AstEnumItem* nodep, AstNUser*) {
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// Expand ranges
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cleanFileline(nodep);
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nodep->iterateChildren(*this);
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if (nodep->rangep()) {
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if (!nodep->rangep()->msbp()->castConst()
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|| !nodep->rangep()->lsbp()->castConst()) nodep->v3error("Enum ranges must be integral, per spec");
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int msb = nodep->rangep()->msbConst();
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int lsb = nodep->rangep()->lsbConst();
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int increment = (msb > lsb) ? -1 : 1;
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int offset_from_init = 0;
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AstNode* addp = NULL;
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for (int i=msb; i!=(lsb+increment); i+=increment, offset_from_init++) {
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string name = nodep->name() + cvtToStr(i);
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AstNode* valuep = NULL;
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if (nodep->valuep()) valuep = new AstAdd(nodep->fileline(), nodep->valuep()->cloneTree(true),
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new AstConst(nodep->fileline(), AstConst::Unsized32(), offset_from_init));
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addp = addp->addNextNull(new AstEnumItem(nodep->fileline(), name, NULL, valuep));
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}
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nodep->replaceWith(addp);
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nodep->deleteTree();
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}
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}
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virtual void visit(AstVar* nodep, AstNUser*) {
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cleanFileline(nodep);
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// We used modTrace before leveling, and we may now
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// want to turn it off now that we know the levelizations
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if (v3Global.opt.traceDepth()
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&& m_modp
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&& (m_modp->level()-1) > v3Global.opt.traceDepth()) {
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m_modp->modTrace(false);
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nodep->trace(false);
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}
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m_varp = nodep;
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nodep->iterateChildren(*this);
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m_varp = NULL;
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// temporaries under an always aren't expected to be blocking
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if (m_inAlways) nodep->fileline()->modifyWarnOff(V3ErrorCode::BLKSEQ, true);
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if (nodep->valuep()) {
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// A variable with an = value can be three things:
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FileLine* fl = nodep->valuep()->fileline();
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// 1. Parameters and function inputs: It's a default to use if not overridden
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if (nodep->isParam() || nodep->isInOnly()) {
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} // 2. Under modules, it's an initial value to be loaded at time 0 via an AstInitial
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else if (m_valueModp) {
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nodep->addNextHere
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(new AstInitial
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(fl, new AstAssign (fl, new AstVarRef(fl, nodep->name(), true),
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nodep->valuep()->unlinkFrBack())));
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} // 3. Under blocks, it's an initial value to be under an assign
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else {
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nodep->addNextHere
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(new AstAssign (fl, new AstVarRef(fl, nodep->name(), true),
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nodep->valuep()->unlinkFrBack()));
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}
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}
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}
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virtual void visit(AstAttrOf* nodep, AstNUser*) {
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cleanFileline(nodep);
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nodep->iterateChildren(*this);
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if (nodep->attrType() == AstAttrType::VAR_CLOCK) {
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if (!m_varp) nodep->v3fatalSrc("Attribute not attached to variable");
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m_varp->attrScClocked(true);
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nodep->unlinkFrBack()->deleteTree(); nodep=NULL;
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}
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else if (nodep->attrType() == AstAttrType::VAR_CLOCK_ENABLE) {
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if (!m_varp) nodep->v3fatalSrc("Attribute not attached to variable");
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m_varp->attrClockEn(true);
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nodep->unlinkFrBack()->deleteTree(); nodep=NULL;
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}
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else if (nodep->attrType() == AstAttrType::VAR_PUBLIC) {
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if (!m_varp) nodep->v3fatalSrc("Attribute not attached to variable");
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m_varp->sigUserRWPublic(true); m_varp->sigModPublic(true);
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nodep->unlinkFrBack()->deleteTree(); nodep=NULL;
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}
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else if (nodep->attrType() == AstAttrType::VAR_PUBLIC_FLAT) {
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if (!m_varp) nodep->v3fatalSrc("Attribute not attached to variable");
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m_varp->sigUserRWPublic(true);
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nodep->unlinkFrBack()->deleteTree(); nodep=NULL;
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}
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else if (nodep->attrType() == AstAttrType::VAR_PUBLIC_FLAT_RD) {
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if (!m_varp) nodep->v3fatalSrc("Attribute not attached to variable");
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m_varp->sigUserRdPublic(true);
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nodep->unlinkFrBack()->deleteTree(); nodep=NULL;
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}
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else if (nodep->attrType() == AstAttrType::VAR_PUBLIC_FLAT_RW) {
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if (!m_varp) nodep->v3fatalSrc("Attribute not attached to variable");
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m_varp->sigUserRWPublic(true);
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nodep->unlinkFrBack()->deleteTree(); nodep=NULL;
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}
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else if (nodep->attrType() == AstAttrType::VAR_ISOLATE_ASSIGNMENTS) {
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if (!m_varp) nodep->v3fatalSrc("Attribute not attached to variable");
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m_varp->attrIsolateAssign(true);
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nodep->unlinkFrBack()->deleteTree(); nodep=NULL;
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}
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else if (nodep->attrType() == AstAttrType::VAR_SFORMAT) {
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if (!m_varp) nodep->v3fatalSrc("Attribute not attached to variable");
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m_varp->attrSFormat(true);
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nodep->unlinkFrBack()->deleteTree(); nodep=NULL;
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}
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else if (nodep->attrType() == AstAttrType::VAR_SC_BV) {
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if (!m_varp) nodep->v3fatalSrc("Attribute not attached to variable");
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m_varp->attrScBv(true);
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nodep->unlinkFrBack()->deleteTree(); nodep=NULL;
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}
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}
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virtual void visit(AstAlwaysPublic* nodep, AstNUser*) {
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// AlwaysPublic was attached under a var, but it's a statement that should be
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// at the same level as the var
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cleanFileline(nodep);
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nodep->iterateChildren(*this);
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if (m_varp) {
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nodep->unlinkFrBack();
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m_varp->addNext(nodep);
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// lvalue is true, because we know we have a verilator public_flat_rw
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// but someday we may be more general
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bool lvalue = m_varp->isSigUserRWPublic();
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nodep->addStmtp(new AstVarRef(nodep->fileline(), m_varp, lvalue));
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}
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}
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virtual void visit(AstDefImplicitDType* nodep, AstNUser*) {
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cleanFileline(nodep);
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UINFO(8," DEFIMPLICIT "<<nodep<<endl);
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// Must remember what names we've already created, and combine duplicates
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// so that for "var enum {...} a,b" a & b will share a common typedef
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// Unique name space under each containerp() so that an addition of a new type won't change every verilated module.
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AstTypedef* defp = NULL;
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ImplTypedefMap::iterator it = m_implTypedef.find(make_pair(nodep->containerp(), nodep->name()));
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if (it != m_implTypedef.end()) {
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defp = it->second;
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} else {
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// Definition must be inserted right after the variable (etc) that needed it
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// AstVar, AstTypedef, AstNodeFTask are common containers
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AstNode* backp = nodep->backp();
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for (; backp; backp=backp->backp()) {
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if (backp->castVar()) break;
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else if (backp->castTypedef()) break;
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else if (backp->castNodeFTask()) break;
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}
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if (!backp) nodep->v3fatalSrc("Implicit enum/struct type created under unexpected node type");
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AstNodeDType* dtypep = nodep->childDTypep(); dtypep->unlinkFrBack();
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if (backp->castTypedef()) { // A typedef doesn't need us to make yet another level of typedefing
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// For typedefs just remove the AstRefDType level of abstraction
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nodep->replaceWith(dtypep);
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nodep->deleteTree(); nodep=NULL;
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return;
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} else {
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defp = new AstTypedef(nodep->fileline(), nodep->name(), VFlagChildDType(), dtypep);
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m_implTypedef.insert(make_pair(make_pair(nodep->containerp(), defp->name()), defp));
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backp->addNextHere(defp);
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}
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}
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nodep->replaceWith(new AstRefDType(nodep->fileline(), defp->name()));
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nodep->deleteTree(); nodep=NULL;
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}
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virtual void visit(AstTypedefFwd* nodep, AstNUser*) {
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// We only needed the forward declaration in order to parse correctly.
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// We won't even check it was ever really defined, as it might have been in a header
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// file referring to a module we never needed
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nodep->unlinkFrBack()->deleteTree();
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}
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virtual void visit(AstNodeModule* nodep, AstNUser*) {
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// Module: Create sim table for entire module and iterate
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cleanFileline(nodep);
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//
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m_modp = nodep;
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m_valueModp = nodep;
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nodep->iterateChildren(*this);
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m_modp = NULL;
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m_valueModp = NULL;
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}
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void visitIterateNoValueMod(AstNode* nodep) {
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// Iterate a node which shouldn't have any local variables moved to an Initial
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cleanFileline(nodep);
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//
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AstNodeModule* upperValueModp = m_valueModp;
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m_valueModp = NULL;
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nodep->iterateChildren(*this);
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m_valueModp = upperValueModp;
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}
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virtual void visit(AstInitial* nodep, AstNUser*) {
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visitIterateNoValueMod(nodep);
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}
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virtual void visit(AstFinal* nodep, AstNUser*) {
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visitIterateNoValueMod(nodep);
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}
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virtual void visit(AstAlways* nodep, AstNUser*) {
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m_inAlways = true;
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visitIterateNoValueMod(nodep);
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m_inAlways = false;
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}
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virtual void visit(AstPslCover* nodep, AstNUser*) {
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visitIterateNoValueMod(nodep);
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}
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virtual void visit(AstNode* nodep, AstNUser*) {
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// Default: Just iterate
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cleanFileline(nodep);
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nodep->iterateChildren(*this);
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}
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public:
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// CONSTUCTORS
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LinkParseVisitor(AstNetlist* rootp) {
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m_varp = NULL;
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m_modp = NULL;
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m_inAlways = false;
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m_inGenerate = false;
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m_needStart = false;
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m_valueModp = NULL;
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rootp->accept(*this);
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}
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virtual ~LinkParseVisitor() {}
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};
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//######################################################################
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// Link class functions
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void V3LinkParse::linkParse(AstNetlist* rootp) {
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UINFO(4,__FUNCTION__<<": "<<endl);
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LinkParseVisitor visitor(rootp);
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}
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