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Support runtime access to public signal names

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This commit is contained in:
Wilson Snyder
2010-03-17 08:22:49 -04:00
parent 2be6b3481c
commit ba93a08b40
13 changed files with 614 additions and 19 deletions
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src/V3Inline.cpp
+18 -2
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@@ -57,6 +57,7 @@ private:
// AstNodeModule::user1p() // bool. True to inline this module (from InlineMarkVisitor)
// Cleared each cell
// AstVar::user2p() // AstVarRef*/AstConst* Points to signal this is a direct connect to
// AstVar::user3() // bool Don't alias the user4, keep it as signal
// STATE
AstNodeModule* m_modp; // Current module
@@ -151,6 +152,10 @@ private:
UINFO(6,"One-to-one "<<connectRefp<<endl);
UINFO(6," -to "<<pinNewVarp<<endl);
pinNewVarp->user2p(connectRefp);
// Public output inside the cell must go via an assign rather than alias
// Else the public logic will set the alias, loosing the value to be propagated up
// (InOnly isn't a problem as the AssignAlias will create the assignment for us)
pinNewVarp->user3(pinNewVarp->isSigUserPublic() && pinNewVarp->isOutOnly());
}
// Cleanup var names, etc, to not conflict
m_cellp = nodep;
@@ -175,6 +180,7 @@ private:
// user2p is either a const or a var.
AstConst* exprconstp = nodep->user2p()->castNode()->castConst();
AstVarRef* exprvarrefp = nodep->user2p()->castNode()->castVarRef();
UINFO(1,"connectto: "<<nodep->user2p()->castNode()<<endl);
if (!exprconstp && !exprvarrefp) {
nodep->v3fatalSrc("Unknown interconnect type; pinReconnectSimple should have cleared up\n");
}
@@ -182,6 +188,15 @@ private:
m_modp->addStmtp(new AstAssignW(nodep->fileline(),
new AstVarRef(nodep->fileline(), nodep, true),
exprconstp->cloneTree(true)));
} else if (nodep->user3()) {
// Public variable at the lower module end - we need to make sure we propagate
// the logic changes up and down; if we aliased, we might remove the change detection
// on the output variable.
UINFO(9,"public pin assign: "<<exprvarrefp<<endl);
if (nodep->isInput()) nodep->v3fatalSrc("Outputs only - inputs use AssignAlias");
m_modp->addStmtp(new AstAssignW(nodep->fileline(),
new AstVarRef(nodep->fileline(), exprvarrefp->varp(), true),
new AstVarRef(nodep->fileline(), nodep, false)));
} else {
m_modp->addStmtp(new AstAssignAlias(nodep->fileline(),
new AstVarRef(nodep->fileline(), nodep, true),
@@ -216,8 +231,9 @@ private:
}
virtual void visit(AstVarRef* nodep, AstNUser*) {
if (m_cellp) {
if (nodep->varp()->user2p() // It's being converted to a alias.
&& !nodep->backp()->castAssignAlias()) { // Don't constant propagate aliases
if (nodep->varp()->user2p() // It's being converted to an alias.
&& !nodep->varp()->user3()
&& !nodep->backp()->castAssignAlias()) { // Don't constant propagate aliases (we just made)
AstConst* exprconstp = nodep->varp()->user2p()->castNode()->castConst();
AstVarRef* exprvarrefp = nodep->varp()->user2p()->castNode()->castVarRef();
if (exprconstp) {