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For UNUSED, ignore black boxed sys calls

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This commit is contained in:
Wilson Snyder
2010-12-30 07:55:31 -05:00
parent 6283df7491
commit 2cb97f7475
9 changed files with 60 additions and 7 deletions
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src/V3Undriven.cpp
+14 -4
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@@ -197,6 +197,7 @@ private:
// STATE
vector<UndrivenVarEntry*> m_entryps; // Nodes to delete when we are finished
bool m_markBoth; // Mark as driven+used
// METHODS
static int debug() {
@@ -242,8 +243,8 @@ private:
if (varrefp && constp && !constp->num().isFourState()) {
UndrivenVarEntry* entryp = getEntryp (varrefp->varp());
int lsb = constp->toUInt();
if (varrefp->lvalue()) entryp->drivenBit(lsb, nodep->width());
else entryp->usedBit(lsb, nodep->width());
if (m_markBoth || varrefp->lvalue()) entryp->drivenBit(lsb, nodep->width());
if (m_markBoth || !varrefp->lvalue()) entryp->usedBit(lsb, nodep->width());
} else {
// else other varrefs handled as unknown mess in AstVarRef
nodep->iterateChildren(*this);
@@ -252,8 +253,16 @@ private:
virtual void visit(AstVarRef* nodep, AstNUser*) {
// Any variable
UndrivenVarEntry* entryp = getEntryp (nodep->varp());
if (nodep->lvalue()) entryp->drivenWhole();
else entryp->usedWhole();
if (m_markBoth || nodep->lvalue()) entryp->drivenWhole();
if (m_markBoth || !nodep->lvalue()) entryp->usedWhole();
}
// Don't know what black boxed calls do, assume in+out
virtual void visit(AstSysIgnore* nodep, AstNUser*) {
bool prevMark = m_markBoth;
m_markBoth = true;
nodep->iterateChildren(*this);
m_markBoth = prevMark;
}
// Until we support tables, primitives will have undriven and unused I/Os
@@ -274,6 +283,7 @@ private:
public:
// CONSTUCTORS
UndrivenVisitor(AstNetlist* nodep) {
m_markBoth = false;
AstNode::user1ClearTree(); // user1p() used on entire tree
nodep->accept(*this);
}