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Support IEEE constant signal strengths (#3601).

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This commit is contained in:
Ryszard Rozak
2022-09-14 07:39:27 -04:00
committed by GitHub
parent ae466b1703
commit a3c58d7b70
24 changed files with 550 additions and 39 deletions
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src/V3LinkLValue.cpp
+8
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@@ -37,6 +37,7 @@ private:
// STATE
bool m_setContinuously = false; // Set that var has some continuous assignment
bool m_setStrengthSpecified = false; // Set that var has assignment with strength specified.
VAccess m_setRefLvalue; // Set VarRefs to lvalues for pin assignments
AstNodeFTask* m_ftaskp = nullptr; // Function or task we're inside
@@ -51,6 +52,9 @@ private:
if (nodep->varp()) {
if (nodep->access().isWriteOrRW() && m_setContinuously) {
nodep->varp()->isContinuously(true);
// Strength may only be specified in continuous assignment,
// so it is needed to check only if m_setContinuously is true
if (m_setStrengthSpecified) nodep->varp()->hasStrengthAssignment(true);
}
if (nodep->access().isWriteOrRW() && !m_ftaskp && nodep->varp()->isReadOnly()) {
nodep->v3warn(ASSIGNIN,
@@ -78,9 +82,13 @@ private:
{
m_setRefLvalue = VAccess::WRITE;
m_setContinuously = VN_IS(nodep, AssignW) || VN_IS(nodep, AssignAlias);
if (AstAssignW* assignwp = VN_CAST(nodep, AssignW)) {
if (assignwp->strengthSpecp()) m_setStrengthSpecified = true;
}
iterateAndNextNull(nodep->lhsp());
m_setRefLvalue = VAccess::NOCHANGE;
m_setContinuously = false;
m_setStrengthSpecified = false;
iterateAndNextNull(nodep->rhsp());
}
}