verilator/src/V3LinkParse.cpp
2021-04-21 13:46:13 -04:00

662 lines
29 KiB
C++

// -*- mode: C++; c-file-style: "cc-mode" -*-
//*************************************************************************
// DESCRIPTION: Verilator: Parse module/signal name references
//
// Code available from: https://verilator.org
//
//*************************************************************************
//
// Copyright 2003-2021 by Wilson Snyder. This program is free software; you
// can redistribute it and/or modify it under the terms of either the GNU
// Lesser General Public License Version 3 or the Perl Artistic License
// Version 2.0.
// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
//
//*************************************************************************
// LinkParse TRANSFORMATIONS:
// Top-down traversal
// Move some attributes around
//*************************************************************************
#include "config_build.h"
#include "verilatedos.h"
#include "V3Global.h"
#include "V3LinkParse.h"
#include "V3Ast.h"
#include "V3Config.h"
#include <algorithm>
#include <map>
#include <set>
#include <vector>
//######################################################################
// Link state, as a visitor of each AstNode
class LinkParseVisitor final : public AstNVisitor {
private:
// NODE STATE
// Cleared on netlist
// AstNode::user1() -> bool. True if processed
// AstNode::user2() -> bool. True if fileline recomputed
AstUser1InUse m_inuser1;
AstUser2InUse m_inuser2;
// TYPES
using ImplTypedefMap = std::map<const std::pair<void*, std::string>, AstTypedef*>;
// STATE
AstVar* m_varp = nullptr; // Variable we're under
ImplTypedefMap m_implTypedef; // Created typedefs for each <container,name>
std::unordered_set<FileLine*> m_filelines; // Filelines that have been seen
bool m_inAlways = false; // Inside an always
AstNodeModule* m_valueModp
= nullptr; // If set, move AstVar->valuep() initial values to this module
AstNodeModule* m_modp = nullptr; // Current module
AstNodeFTask* m_ftaskp = nullptr; // Current task
AstNodeDType* m_dtypep = nullptr; // Current data type
int m_genblkAbove = 0; // Begin block number of if/case/for above
int m_genblkNum = 0; // Begin block number, 0=none seen
VLifetime m_lifetime = VLifetime::STATIC; // Propagating lifetime
// METHODS
VL_DEBUG_FUNC; // Declare debug()
void cleanFileline(AstNode* nodep) {
if (!nodep->user2SetOnce()) { // Process once
// We make all filelines unique per AstNode. This allows us to
// later turn off messages on a fileline when an issue is found
// so that messages on replicated blocks occur only once,
// without suppressing other token's messages as a side effect.
// We could have verilog.l create a new one on every token,
// but that's a lot more structures than only doing AST nodes.
if (m_filelines.find(nodep->fileline()) != m_filelines.end()) {
nodep->fileline(new FileLine(nodep->fileline()));
}
m_filelines.insert(nodep->fileline());
}
}
string nameFromTypedef(AstNode* nodep) {
// Try to find a name for a typedef'ed enum/struct
if (AstTypedef* typedefp = VN_CAST(nodep->backp(), Typedef)) {
// Create a name for the enum, to aid debug and tracing
// This name is not guaranteed to be globally unique (due to later parameterization)
string above;
if (m_modp && VN_IS(m_modp, Package)) {
above = m_modp->name() + "::";
} else if (m_modp) {
above = m_modp->name() + ".";
}
return above + typedefp->name();
}
return "";
}
void visitIterateNodeDType(AstNodeDType* nodep) {
if (!nodep->user1SetOnce()) { // Process only once.
cleanFileline(nodep);
{
VL_RESTORER(m_dtypep);
m_dtypep = nodep;
iterateChildren(nodep);
}
}
}
// VISITs
virtual void visit(AstNodeFTask* nodep) override {
if (!nodep->user1SetOnce()) { // Process only once.
V3Config::applyFTask(m_modp, nodep);
cleanFileline(nodep);
VL_RESTORER(m_ftaskp);
VL_RESTORER(m_lifetime);
{
m_ftaskp = nodep;
m_lifetime = nodep->lifetime();
if (m_lifetime.isNone()) {
// Automatic always until we support static
m_lifetime = VLifetime::AUTOMATIC;
}
iterateChildren(nodep);
}
}
}
virtual void visit(AstNodeFTaskRef* nodep) override {
if (!nodep->user1SetOnce()) { // Process only once.
cleanFileline(nodep);
UINFO(5, " " << nodep << endl);
{
VL_RESTORER(m_valueModp);
m_valueModp = nullptr;
iterateChildren(nodep);
}
}
}
virtual void visit(AstNodeDType* nodep) override { visitIterateNodeDType(nodep); }
virtual void visit(AstEnumDType* nodep) override {
if (nodep->name() == "") {
nodep->name(nameFromTypedef(nodep)); // Might still remain ""
}
visitIterateNodeDType(nodep);
}
virtual void visit(AstNodeUOrStructDType* nodep) override {
if (nodep->name() == "") {
nodep->name(nameFromTypedef(nodep)); // Might still remain ""
}
visitIterateNodeDType(nodep);
}
virtual void visit(AstEnumItem* nodep) override {
// Expand ranges
cleanFileline(nodep);
iterateChildren(nodep);
if (nodep->rangep()) {
if (VL_UNCOVERABLE(!VN_IS(nodep->rangep()->leftp(), Const) // LCOV_EXCL_START
|| !VN_IS(nodep->rangep()->rightp(), Const))) {
// We check this rule in the parser, so shouldn't fire
nodep->v3error("Enum ranges must be integral, per spec");
} // LCOV_EXCL_STOP
int left = nodep->rangep()->leftConst();
int right = nodep->rangep()->rightConst();
int increment = (left > right) ? -1 : 1;
int offset_from_init = 0;
AstNode* addp = nullptr;
for (int i = left; i != (right + increment); i += increment, offset_from_init++) {
string name = nodep->name() + cvtToStr(i);
AstNode* valuep = nullptr;
if (nodep->valuep()) {
valuep = new AstAdd(
nodep->fileline(), nodep->valuep()->cloneTree(true),
new AstConst(nodep->fileline(), AstConst::Unsized32(), offset_from_init));
}
AstNode* newp = new AstEnumItem(nodep->fileline(), name, nullptr, valuep);
if (addp) {
addp = addp->addNextNull(newp);
} else {
addp = newp;
}
}
nodep->replaceWith(addp);
VL_DO_DANGLING(nodep->deleteTree(), nodep);
}
}
virtual void visit(AstVar* nodep) override {
cleanFileline(nodep);
if (nodep->lifetime().isNone()) {
if (m_ftaskp) {
nodep->lifetime(VLifetime::AUTOMATIC);
} else {
nodep->lifetime(m_lifetime);
}
}
if (nodep->isParam() && !nodep->valuep()
&& nodep->fileline()->language() < V3LangCode::L1800_2009) {
nodep->v3error("Parameter requires default value, or use IEEE 1800-2009 or later.");
}
if (VN_IS(nodep->subDTypep(), ParseTypeDType)) {
// It's a parameter type. Use a different node type for this.
AstNodeDType* dtypep = VN_CAST(nodep->valuep(), NodeDType);
if (!dtypep) {
nodep->v3error(
"Parameter type's initial value isn't a type: " << nodep->prettyNameQ());
nodep->unlinkFrBack();
} else {
dtypep->unlinkFrBack();
AstNode* newp = new AstParamTypeDType(nodep->fileline(), nodep->varType(),
nodep->name(), VFlagChildDType(), dtypep);
nodep->replaceWith(newp);
VL_DO_DANGLING(nodep->deleteTree(), nodep);
}
return;
}
// Maybe this variable has a signal attribute
V3Config::applyVarAttr(m_modp, m_ftaskp, nodep);
if (v3Global.opt.publicFlatRW()) {
switch (nodep->varType()) {
case AstVarType::VAR: // FALLTHRU
case AstVarType::GPARAM: // FALLTHRU
case AstVarType::LPARAM: // FALLTHRU
case AstVarType::PORT: // FALLTHRU
case AstVarType::WIRE: nodep->sigUserRWPublic(true); break;
default: break;
}
}
// We used modTrace before leveling, and we may now
// want to turn it off now that we know the levelizations
if (v3Global.opt.traceDepth() && m_modp
&& (m_modp->level() - 1) > v3Global.opt.traceDepth()) {
m_modp->modTrace(false);
nodep->trace(false);
}
m_varp = nodep;
iterateChildren(nodep);
m_varp = nullptr;
// temporaries under an always aren't expected to be blocking
if (m_inAlways) nodep->fileline()->modifyWarnOff(V3ErrorCode::BLKSEQ, true);
if (nodep->valuep()) {
// A variable with an = value can be three things:
FileLine* fl = nodep->valuep()->fileline();
if (nodep->isParam() || (m_ftaskp && nodep->isNonOutput())) {
// 1. Parameters and function inputs: It's a default to use if not overridden
} else if (!m_ftaskp && !VN_IS(m_modp, Class) && nodep->isNonOutput()) {
nodep->v3warn(E_UNSUPPORTED, "Unsupported: Default value on module input: "
<< nodep->prettyNameQ());
nodep->valuep()->unlinkFrBack()->deleteTree();
} // 2. Under modules/class, it's an initial value to be loaded at time 0 via an
// AstInitial
else if (m_valueModp) {
// Making an AstAssign (vs AstAssignW) to a wire is an error, suppress it
FileLine* newfl = new FileLine(fl);
newfl->warnOff(V3ErrorCode::PROCASSWIRE, true);
auto* assp
= new AstAssign(newfl, new AstVarRef(newfl, nodep->name(), VAccess::WRITE),
nodep->valuep()->unlinkFrBack());
nodep->addNextHere(new AstInitial(newfl, assp));
} // 4. Under blocks, it's an initial value to be under an assign
else {
nodep->addNextHere(new AstAssign(fl,
new AstVarRef(fl, nodep->name(), VAccess::WRITE),
nodep->valuep()->unlinkFrBack()));
}
}
if (nodep->isIfaceRef() && !nodep->isIfaceParent()) {
// Only AstIfaceRefDType's at this point correspond to ports;
// haven't made additional ones for interconnect yet, so assert is simple
// What breaks later is we don't have a Scope/Cell representing
// the interface to attach to
if (m_modp->level() <= 2) {
nodep->v3warn(E_UNSUPPORTED, "Unsupported: Interfaced port on top level module");
}
}
}
virtual void visit(AstAttrOf* nodep) override {
cleanFileline(nodep);
iterateChildren(nodep);
if (nodep->attrType() == AstAttrType::DT_PUBLIC) {
AstTypedef* typep = VN_CAST(nodep->backp(), Typedef);
UASSERT_OBJ(typep, nodep, "Attribute not attached to typedef");
typep->attrPublic(true);
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
} else if (nodep->attrType() == AstAttrType::VAR_CLOCK_ENABLE) {
UASSERT_OBJ(m_varp, nodep, "Attribute not attached to variable");
m_varp->attrClockEn(true);
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
} else if (nodep->attrType() == AstAttrType::VAR_PUBLIC) {
UASSERT_OBJ(m_varp, nodep, "Attribute not attached to variable");
m_varp->sigUserRWPublic(true);
m_varp->sigModPublic(true);
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
} else if (nodep->attrType() == AstAttrType::VAR_PUBLIC_FLAT) {
UASSERT_OBJ(m_varp, nodep, "Attribute not attached to variable");
m_varp->sigUserRWPublic(true);
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
} else if (nodep->attrType() == AstAttrType::VAR_PUBLIC_FLAT_RD) {
UASSERT_OBJ(m_varp, nodep, "Attribute not attached to variable");
m_varp->sigUserRdPublic(true);
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
} else if (nodep->attrType() == AstAttrType::VAR_PUBLIC_FLAT_RW) {
UASSERT_OBJ(m_varp, nodep, "Attribute not attached to variable");
m_varp->sigUserRWPublic(true);
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
} else if (nodep->attrType() == AstAttrType::VAR_ISOLATE_ASSIGNMENTS) {
UASSERT_OBJ(m_varp, nodep, "Attribute not attached to variable");
m_varp->attrIsolateAssign(true);
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
} else if (nodep->attrType() == AstAttrType::VAR_SFORMAT) {
UASSERT_OBJ(m_varp, nodep, "Attribute not attached to variable");
m_varp->attrSFormat(true);
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
} else if (nodep->attrType() == AstAttrType::VAR_SPLIT_VAR) {
UASSERT_OBJ(m_varp, nodep, "Attribute not attached to variable");
if (!VN_IS(m_modp, Module)) {
m_varp->v3warn(
SPLITVAR,
m_varp->prettyNameQ()
<< " has split_var metacomment, "
"but will not be split because it is not declared in a module.");
} else {
m_varp->attrSplitVar(true);
}
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
} else if (nodep->attrType() == AstAttrType::VAR_SC_BV) {
UASSERT_OBJ(m_varp, nodep, "Attribute not attached to variable");
m_varp->attrScBv(true);
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
} else if (nodep->attrType() == AstAttrType::VAR_CLOCKER) {
UASSERT_OBJ(m_varp, nodep, "Attribute not attached to variable");
m_varp->attrClocker(VVarAttrClocker::CLOCKER_YES);
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
} else if (nodep->attrType() == AstAttrType::VAR_NO_CLOCKER) {
UASSERT_OBJ(m_varp, nodep, "Attribute not attached to variable");
m_varp->attrClocker(VVarAttrClocker::CLOCKER_NO);
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
}
}
virtual void visit(AstAlwaysPublic* nodep) override {
// AlwaysPublic was attached under a var, but it's a statement that should be
// at the same level as the var
cleanFileline(nodep);
iterateChildren(nodep);
if (m_varp) {
nodep->unlinkFrBack();
m_varp->addNext(nodep);
// lvalue is true, because we know we have a verilator public_flat_rw
// but someday we may be more general
bool lvalue = m_varp->isSigUserRWPublic();
nodep->addStmtp(
new AstVarRef(nodep->fileline(), m_varp, lvalue ? VAccess::WRITE : VAccess::READ));
}
}
virtual void visit(AstDefImplicitDType* nodep) override {
cleanFileline(nodep);
UINFO(8, " DEFIMPLICIT " << nodep << endl);
// Must remember what names we've already created, and combine duplicates
// so that for "var enum {...} a,b" a & b will share a common typedef
// Unique name space under each containerp() so that an addition of
// a new type won't change every verilated module.
AstTypedef* defp = nullptr;
ImplTypedefMap::iterator it
= m_implTypedef.find(std::make_pair(nodep->containerp(), nodep->name()));
if (it != m_implTypedef.end()) {
defp = it->second;
} else {
// Definition must be inserted right after the variable (etc) that needed it
// AstVar, AstTypedef, AstNodeFTask are common containers
AstNode* backp = nodep->backp();
for (; backp; backp = backp->backp()) {
if (VN_IS(backp, Var) || VN_IS(backp, Typedef) || VN_IS(backp, NodeFTask)) break;
}
UASSERT_OBJ(backp, nodep,
"Implicit enum/struct type created under unexpected node type");
AstNodeDType* dtypep = nodep->childDTypep();
dtypep->unlinkFrBack();
if (VN_IS(backp, Typedef)) {
// A typedef doesn't need us to make yet another level of typedefing
// For typedefs just remove the AstRefDType level of abstraction
nodep->replaceWith(dtypep);
VL_DO_DANGLING(nodep->deleteTree(), nodep);
return;
} else {
defp = new AstTypedef(nodep->fileline(), nodep->name(), nullptr, VFlagChildDType(),
dtypep);
m_implTypedef.insert(
std::make_pair(std::make_pair(nodep->containerp(), defp->name()), defp));
backp->addNextHere(defp);
}
}
nodep->replaceWith(new AstRefDType(nodep->fileline(), defp->name()));
VL_DO_DANGLING(nodep->deleteTree(), nodep);
}
virtual void visit(AstForeach* nodep) override {
// FOREACH(array,loopvars,body)
// -> BEGIN(declare vars, loopa=lowest; WHILE(loopa<=highest, ... body))
// nodep->dumpTree(cout, "-foreach-old:");
UINFO(9, "FOREACH " << nodep << endl);
// nodep->dumpTree(cout, "-foreach-in:");
AstNode* newp = nodep->bodysp();
if (newp) newp->unlinkFrBackWithNext();
// Separate iteration vars from base from variable
// Input:
// v--- arrayp
// 1. DOT(DOT(first, second), ASTSELLOOPVARS(third, var0..var1))
// Separated:
// bracketp = ASTSELLOOPVARS(...)
// arrayp = DOT(DOT(first, second), third)
// firstVarp = var0..var1
// Other examples
// 2. ASTSELBIT(first, var0))
// 3. ASTSELLOOPVARS(first, var0..var1))
// 4. DOT(DOT(first, second), ASTSELBIT(third, var0))
AstNode* bracketp = nodep->arrayp();
AstNode* firstVarsp = nullptr;
while (AstDot* dotp = VN_CAST(bracketp, Dot)) { bracketp = dotp->rhsp(); }
if (AstSelBit* selp = VN_CAST(bracketp, SelBit)) {
firstVarsp = selp->rhsp()->unlinkFrBackWithNext();
selp->replaceWith(selp->fromp()->unlinkFrBack());
VL_DO_DANGLING(selp->deleteTree(), selp);
} else if (AstSelLoopVars* selp = VN_CAST(bracketp, SelLoopVars)) {
firstVarsp = selp->elementsp()->unlinkFrBackWithNext();
selp->replaceWith(selp->fromp()->unlinkFrBack());
VL_DO_DANGLING(selp->deleteTree(), selp);
} else {
nodep->v3error(
"Syntax error; foreach missing bracketed index variable (IEEE 1800-2017 12.7.3)");
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
return;
}
AstNode* arrayp = nodep->arrayp(); // Maybe different node since bracketp looked
if (!VN_IS(arrayp, ParseRef) && !VN_IS(arrayp, Dot)) {
// Code below needs to use other then attributes to figure out the bounds
// Also need to deal with queues, etc
arrayp->v3warn(E_UNSUPPORTED, "Unsupported: foreach on non-simple variable reference");
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
return;
}
// Split into for loop
// Must do innermost (last) variable first
int dimension = 1;
AstNode* lastVarsp = firstVarsp;
while (lastVarsp->nextp()) {
lastVarsp = lastVarsp->nextp();
dimension++;
}
for (AstNode* varsp = lastVarsp; varsp; varsp = varsp->backp()) {
UINFO(9, "foreachVar " << varsp << endl);
FileLine* fl = varsp->fileline();
AstNode* varp
= new AstVar(fl, AstVarType::BLOCKTEMP, varsp->name(), nodep->findSigned32DType());
// These will be the left and right dimensions and size of the array:
AstNode* leftp = new AstAttrOf(fl, AstAttrType::DIM_LEFT, arrayp->cloneTree(false),
new AstConst(fl, dimension));
AstNode* rightp = new AstAttrOf(fl, AstAttrType::DIM_RIGHT, arrayp->cloneTree(false),
new AstConst(fl, dimension));
AstNode* sizep = new AstAttrOf(fl, AstAttrType::DIM_SIZE, arrayp->cloneTree(false),
new AstConst(fl, dimension));
AstNode* stmtsp = varp;
// Assign left-dimension into the loop var:
stmtsp->addNext(
new AstAssign(fl, new AstVarRef(fl, varp->name(), VAccess::WRITE), leftp));
// This will turn into a constant bool for static arrays
AstNode* notemptyp = new AstGt(fl, sizep, new AstConst(fl, 0));
// This will turn into a bool constant, indicating whether
// we count the loop variable up or down:
AstNode* countupp = new AstLte(fl, leftp->cloneTree(true), rightp->cloneTree(true));
AstNode* comparep = new AstCond(
fl, countupp->cloneTree(true),
// Left increments up to right
new AstLte(fl, new AstVarRef(fl, varp->name(), VAccess::READ),
rightp->cloneTree(true)),
// Left decrements down to right
new AstGte(fl, new AstVarRef(fl, varp->name(), VAccess::READ), rightp));
// This will reduce to comparep for static arrays
AstNode* condp = new AstAnd(fl, notemptyp, comparep);
AstNode* incp = new AstAssign(
fl, new AstVarRef(fl, varp->name(), VAccess::WRITE),
new AstAdd(fl, new AstVarRef(fl, varp->name(), VAccess::READ),
new AstCond(fl, countupp, new AstConst(fl, 1), new AstConst(fl, -1))));
stmtsp->addNext(new AstWhile(fl, condp, newp, incp));
newp = new AstBegin(nodep->fileline(), "", stmtsp, false, true);
dimension--;
}
// newp->dumpTree(cout, "-foreach-new:");
VL_DO_DANGLING(firstVarsp->deleteTree(), firstVarsp);
nodep->replaceWith(newp);
VL_DO_DANGLING(nodep->deleteTree(), nodep);
}
virtual void visit(AstNodeModule* nodep) override {
V3Config::applyModule(nodep);
VL_RESTORER(m_modp);
VL_RESTORER(m_genblkAbove);
VL_RESTORER(m_genblkNum);
VL_RESTORER(m_lifetime);
{
// Module: Create sim table for entire module and iterate
cleanFileline(nodep);
//
m_modp = nodep;
m_genblkAbove = 0;
m_genblkNum = 0;
m_valueModp = nodep;
m_lifetime = nodep->lifetime();
if (m_lifetime.isNone()) {
m_lifetime = VN_IS(nodep, Class) ? VLifetime::AUTOMATIC : VLifetime::STATIC;
}
iterateChildren(nodep);
}
m_valueModp = nodep;
}
void visitIterateNoValueMod(AstNode* nodep) {
// Iterate a node which shouldn't have any local variables moved to an Initial
cleanFileline(nodep);
{
VL_RESTORER(m_valueModp);
m_valueModp = nullptr;
iterateChildren(nodep);
}
}
virtual void visit(AstNodeProcedure* nodep) override { visitIterateNoValueMod(nodep); }
virtual void visit(AstAlways* nodep) override {
VL_RESTORER(m_inAlways);
m_inAlways = true;
visitIterateNoValueMod(nodep);
}
virtual void visit(AstCover* nodep) override { visitIterateNoValueMod(nodep); }
virtual void visit(AstRestrict* nodep) override { visitIterateNoValueMod(nodep); }
virtual void visit(AstBegin* nodep) override {
V3Config::applyCoverageBlock(m_modp, nodep);
cleanFileline(nodep);
AstNode* backp = nodep->backp();
// IEEE says directly nested item is not a new block
bool nestedIf = (nodep->implied() // User didn't provide begin/end
&& (VN_IS(nodep->stmtsp(), GenIf)
|| VN_IS(nodep->stmtsp(), GenCase)) // Has an if/case
&& !nodep->stmtsp()->nextp()); // Has only one item
// It's not FOR(BEGIN(...)) but we earlier changed it to BEGIN(FOR(...))
if (nodep->genforp()) {
++m_genblkNum;
if (nodep->name() == "") nodep->name("genblk" + cvtToStr(m_genblkNum));
}
if (nodep->generate() && nodep->name() == ""
&& (VN_IS(backp, CaseItem) || VN_IS(backp, GenIf)) && !nestedIf) {
nodep->name("genblk" + cvtToStr(m_genblkAbove));
}
if (nodep->name() != "") {
VL_RESTORER(m_genblkAbove);
VL_RESTORER(m_genblkNum);
m_genblkAbove = 0;
m_genblkNum = 0;
iterateChildren(nodep);
} else {
iterateChildren(nodep);
}
}
virtual void visit(AstGenCase* nodep) override {
++m_genblkNum;
cleanFileline(nodep);
{
VL_RESTORER(m_genblkAbove);
VL_RESTORER(m_genblkNum);
m_genblkAbove = m_genblkNum;
m_genblkNum = 0;
iterateChildren(nodep);
}
}
virtual void visit(AstGenIf* nodep) override {
++m_genblkNum;
cleanFileline(nodep);
{
VL_RESTORER(m_genblkAbove);
VL_RESTORER(m_genblkNum);
m_genblkAbove = m_genblkNum;
m_genblkNum = 0;
iterateChildren(nodep);
}
}
virtual void visit(AstCase* nodep) override {
V3Config::applyCase(nodep);
cleanFileline(nodep);
iterateChildren(nodep);
}
virtual void visit(AstPrintTimeScale* nodep) override {
// Inlining may change hierarchy, so just save timescale where needed
cleanFileline(nodep);
iterateChildren(nodep);
nodep->name(m_modp->name());
nodep->timeunit(m_modp->timeunit());
}
virtual void visit(AstSFormatF* nodep) override {
cleanFileline(nodep);
iterateChildren(nodep);
nodep->timeunit(m_modp->timeunit());
}
virtual void visit(AstTime* nodep) override {
cleanFileline(nodep);
iterateChildren(nodep);
nodep->timeunit(m_modp->timeunit());
}
virtual void visit(AstTimeD* nodep) override {
cleanFileline(nodep);
iterateChildren(nodep);
nodep->timeunit(m_modp->timeunit());
}
virtual void visit(AstTimeImport* nodep) override {
cleanFileline(nodep);
iterateChildren(nodep);
nodep->timeunit(m_modp->timeunit());
}
virtual void visit(AstTimingControl* nodep) override {
cleanFileline(nodep);
iterateChildren(nodep);
AstAlways* alwaysp = VN_CAST(nodep->backp(), Always);
if (alwaysp && alwaysp->keyword() == VAlwaysKwd::ALWAYS_COMB) {
alwaysp->v3error("Timing control statements not legal under always_comb "
"(IEEE 1800-2017 9.2.2.2.2)\n"
<< nodep->warnMore() << "... Suggest use a normal 'always'");
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
} else if (alwaysp && !alwaysp->sensesp()) {
// Verilator is still ony supporting SenTrees under an always,
// so allow the parser to handle everything and shim to
// historical AST here
if (AstSenTree* sensesp = nodep->sensesp()) {
sensesp->unlinkFrBackWithNext();
alwaysp->sensesp(sensesp);
}
if (nodep->stmtsp()) alwaysp->addStmtp(nodep->stmtsp()->unlinkFrBackWithNext());
VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
}
}
virtual void visit(AstNode* nodep) override {
// Default: Just iterate
cleanFileline(nodep);
iterateChildren(nodep);
}
public:
// CONSTRUCTORS
explicit LinkParseVisitor(AstNetlist* rootp) { iterate(rootp); }
virtual ~LinkParseVisitor() override = default;
};
//######################################################################
// Link class functions
void V3LinkParse::linkParse(AstNetlist* rootp) {
UINFO(4, __FUNCTION__ << ": " << endl);
{ LinkParseVisitor visitor(rootp); } // Destruct before checking
V3Global::dumpCheckGlobalTree("linkparse", 0, v3Global.opt.dumpTreeLevel(__FILE__) >= 6);
}