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Support `unconnected_drive

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This commit is contained in:
Wilson Snyder
2020-04-09 23:26:03 -04:00
parent 343db78c03
commit 15b40a97d9
13 changed files with 140 additions and 9 deletions
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src/V3Inst.cpp
+17 -3
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@@ -62,13 +62,15 @@ private:
// PIN(p,expr) -> ASSIGNW(VARXREF(p),expr) (if sub's input)
// or ASSIGNW(expr,VARXREF(p)) (if sub's output)
UINFO(4," PIN "<<nodep<<endl);
if (!nodep->user1()) {
// Simplify it
V3Inst::pinReconnectSimple(nodep, m_cellp, false);
}
if (!nodep->exprp()) return; // No-connect
if (debug()>=9) nodep->dumpTree(cout, " Pin_oldb: ");
V3Inst::checkOutputShort(nodep);
// Use user1p on the PIN to indicate we created an assign for this pin
if (!nodep->user1SetOnce()) {
// Simplify it
V3Inst::pinReconnectSimple(nodep, m_cellp, false);
// Make an ASSIGNW (expr, pin)
AstNode* exprp = nodep->exprp()->cloneTree(false);
UASSERT_OBJ(exprp->width() == nodep->modVarp()->width(), nodep,
@@ -481,8 +483,20 @@ public:
// Else create a intermediate wire to perform the interconnect
// Return the new assignment, if one was made
// Note this module calles cloneTree() via new AstVar
AstVar* pinVarp = pinp->modVarp();
if (!pinp->exprp()) {
// No-connect, perhaps promote based on `unconnected_drive,
// otherwise done
if (pinVarp->direction() == VDirection::INPUT
&& cellp->modp()->unconnectedDrive().isSetTrue()) {
pinp->exprp(new AstConst(pinp->fileline(), AstConst::StringToParse(), "'1"));
} else if (pinVarp->direction() == VDirection::INPUT
&& cellp->modp()->unconnectedDrive().isSetFalse()) {
pinp->exprp(new AstConst(pinp->fileline(), AstConst::StringToParse(), "'0"));
} else {
return NULL;
}
}
AstVarRef* connectRefp = VN_CAST(pinp->exprp(), VarRef);
AstVarXRef* connectXRefp = VN_CAST(pinp->exprp(), VarXRef);
AstBasicDType* pinBasicp = VN_CAST(pinVarp->dtypep(), BasicDType); // Maybe NULL