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Support clocking blocks in virtual interfaces (#5235)

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This commit is contained in:
Arkadiusz Kozdra
2024-07-09 18:31:58 -04:00
committed by GitHub
parent e3e7b3f2b5
commit 2cfec0ecc3
19 changed files with 423 additions and 77 deletions
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src/V3Clock.cpp
+9 -49
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@@ -68,14 +68,10 @@ public:
class ClockVisitor final : public VNVisitor {
// NODE STATE
// ???
const VNUser1InUse m_user1InUse;
// STATE
AstCFunc* m_evalp = nullptr; // The '_eval' function
AstScope* m_scopep = nullptr; // Current scope
AstSenTree* m_lastSenp = nullptr; // Last sensitivity match, so we can detect duplicates.
AstIf* m_lastIfp = nullptr; // Last sensitivity if active to add more under
bool m_inSampled = false; // True inside a sampled expression
// METHODS
@@ -88,24 +84,6 @@ class ClockVisitor final : public VNVisitor {
}
return senEqnp;
}
AstVarScope* createSampledVar(AstVarScope* vscp) {
if (vscp->user1p()) return VN_AS(vscp->user1p(), VarScope);
const AstVar* const varp = vscp->varp();
const string newvarname
= string{"__Vsampled__"} + vscp->scopep()->nameDotless() + "__" + varp->name();
FileLine* const flp = vscp->fileline();
AstVar* const newvarp = new AstVar{flp, VVarType::MODULETEMP, newvarname, varp->dtypep()};
m_scopep->modp()->addStmtsp(newvarp);
AstVarScope* const newvscp = new AstVarScope{flp, m_scopep, newvarp};
vscp->user1p(newvscp);
m_scopep->addVarsp(newvscp);
// At the top of _eval, assign them
AstAssign* const finalp = new AstAssign{flp, new AstVarRef{flp, newvscp, VAccess::WRITE},
new AstVarRef{flp, vscp, VAccess::READ}};
m_evalp->addInitsp(finalp);
UINFO(4, "New Sampled: " << newvscp << endl);
return newvscp;
}
AstIf* makeActiveIf(AstSenTree* sensesp) {
AstNodeExpr* const senEqnp = createSenseEquation(sensesp->sensesp());
UASSERT_OBJ(senEqnp, sensesp, "No sense equation, shouldn't be in sequent activation.");
@@ -179,33 +157,15 @@ class ClockVisitor final : public VNVisitor {
clearLastSen();
}
//========== Create sampled values
void visit(AstScope* nodep) override {
VL_RESTORER(m_scopep);
{
m_scopep = nodep;
iterateChildren(nodep);
}
}
void visit(AstSampled* nodep) override {
VL_RESTORER(m_inSampled);
{
m_inSampled = true;
iterateChildren(nodep);
nodep->replaceWith(nodep->exprp()->unlinkFrBack());
VL_DO_DANGLING(pushDeletep(nodep), nodep);
}
}
void visit(AstVarRef* nodep) override {
iterateChildren(nodep);
if (m_inSampled && !nodep->user1SetOnce()) {
UASSERT_OBJ(nodep->access().isReadOnly(), nodep, "Should have failed in V3Access");
AstVarScope* const varscp = nodep->varScopep();
AstVarScope* const lastscp = createSampledVar(varscp);
AstNode* const newp = new AstVarRef{nodep->fileline(), lastscp, VAccess::READ};
newp->user1SetOnce(); // Don't sample this one
nodep->replaceWith(newp);
VL_DO_DANGLING(pushDeletep(nodep), nodep);
//========== Move sampled assignments
void visit(AstVarScope* nodep) override {
AstVar* varp = nodep->varp();
if (varp->valuep() && varp->name().substr(0, strlen("__Vsampled")) == "__Vsampled") {
m_evalp->addInitsp(new AstAssign{
nodep->fileline(), new AstVarRef{nodep->fileline(), nodep, VAccess::WRITE},
VN_AS(varp->valuep()->unlinkFrBack(), NodeExpr)});
varp->direction(VDirection::NONE); // Restore defaults
varp->primaryIO(false);
}
}