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Support default disable iff and $inferred_disable (#4016).

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This commit is contained in:
Wilson Snyder
2024-11-26 22:27:32 -05:00
parent e14903cfb2
commit 99daa8d24b
13 changed files with 185 additions and 59 deletions
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src/V3AssertPre.cpp
+29 -1
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@@ -45,7 +45,8 @@ private:
AstNodeModule* m_modp = nullptr; // Current module
AstClocking* m_clockingp = nullptr; // Current clocking block
// Reset each module:
AstClocking* m_defaultClockingp = nullptr; // Default clocking for the current module
AstClocking* m_defaultClockingp = nullptr; // Default clocking for current module
AstDefaultDisable* m_defaultDisablep = nullptr; // Default disable for current module
// Reset each assertion:
AstSenItem* m_senip = nullptr; // Last sensitivity
// Reset each always:
@@ -522,6 +523,21 @@ private:
VL_DO_DANGLING(pushDeletep(nodep), nodep);
}
void visit(AstDefaultDisable* nodep) override {
// Done with these
VL_DO_DANGLING(pushDeletep(nodep->unlinkFrBack()), nodep);
}
void visit(AstInferredDisable* nodep) override {
AstNode* newp;
if (m_defaultDisablep) {
newp = m_defaultDisablep->condp()->cloneTreePure(true);
} else {
newp = new AstConst{nodep->fileline(), AstConst::BitFalse{}};
}
nodep->replaceWith(newp);
VL_DO_DANGLING(pushDeletep(nodep), nodep);
}
void visit(AstPropSpec* nodep) override {
nodep = substitutePropertyCall(nodep);
// No need to iterate the body, once replace will get iterated
@@ -530,6 +546,9 @@ private:
nodep->v3warn(E_UNSUPPORTED, "Unsupported: Only one PSL clock allowed per assertion");
// Block is the new expression to evaluate
AstNodeExpr* blockp = VN_AS(nodep->propp()->unlinkFrBack(), NodeExpr);
if (!nodep->disablep() && m_defaultDisablep) {
nodep->disablep(m_defaultDisablep->condp()->cloneTreePure(true));
}
if (AstNodeExpr* const disablep = nodep->disablep()) {
m_disablep = disablep->cloneTreePure(false);
if (VN_IS(nodep->backp(), Cover)) {
@@ -547,6 +566,7 @@ private:
}
void visit(AstNodeModule* nodep) override {
VL_RESTORER(m_defaultClockingp);
VL_RESTORER(m_defaultDisablep);
VL_RESTORER(m_modp);
m_defaultClockingp = nullptr;
nodep->foreach([&](AstClocking* const clockingp) {
@@ -558,6 +578,14 @@ private:
m_defaultClockingp = clockingp;
}
});
m_defaultDisablep = nullptr;
nodep->foreach([&](AstDefaultDisable* const disablep) {
if (m_defaultDisablep) {
disablep->v3error("Only one 'default disable iff' allowed per module"
" (IEEE 1800-2023 16.15)");
}
m_defaultDisablep = disablep;
});
m_modp = nodep;
iterateChildren(nodep);
}