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Support $monitor and $strobe.

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This commit is contained in:
Wilson Snyder
2020-11-29 11:31:38 -05:00
parent 67103d346b
commit 665e8edaff
23 changed files with 548 additions and 22 deletions
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src/V3Assert.cpp
+72 -2
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@@ -36,7 +36,11 @@ private:
// STATE
AstNodeModule* m_modp = nullptr; // Last module
AstBegin* m_beginp = nullptr; // Last begin
unsigned m_monitorNum = 0; // Global $monitor numbering (not per module)
AstVar* m_monitorNumVarp = nullptr; // $monitor number variable
AstVar* m_monitorOffVarp = nullptr; // $monitoroff variable
unsigned m_modPastNum = 0; // Module past numbering
unsigned m_modStrobeNum = 0; // Module $strobe numbering
VDouble0 m_statCover; // Statistic tracking
VDouble0 m_statAsNotImm; // Statistic tracking
VDouble0 m_statAsImm; // Statistic tracking
@@ -62,7 +66,26 @@ private:
nodep->fmtp()->scopeNamep(new AstScopeName(nodep->fileline()));
}
}
AstVarRef* newMonitorNumVarRefp(AstNode* nodep, VAccess access) {
if (!m_monitorNumVarp) {
m_monitorNumVarp = new AstVar{nodep->fileline(), AstVarType::MODULETEMP,
"__VmonitorNum", nodep->findUInt64DType()};
v3Global.rootp()->dollarUnitPkgAddp()->addStmtp(m_monitorNumVarp);
}
const auto varrefp = new AstVarRef(nodep->fileline(), m_monitorNumVarp, access);
varrefp->classOrPackagep(v3Global.rootp()->dollarUnitPkgAddp());
return varrefp;
}
AstVarRef* newMonitorOffVarRefp(AstNode* nodep, VAccess access) {
if (!m_monitorOffVarp) {
m_monitorOffVarp = new AstVar{nodep->fileline(), AstVarType::MODULETEMP,
"__VmonitorOff", nodep->findBitDType()};
v3Global.rootp()->dollarUnitPkgAddp()->addStmtp(m_monitorOffVarp);
}
const auto varrefp = new AstVarRef(nodep->fileline(), m_monitorOffVarp, access);
varrefp->classOrPackagep(v3Global.rootp()->dollarUnitPkgAddp());
return varrefp;
}
AstNode* newIfAssertOn(AstNode* nodep) {
// Add a internal if to check assertions are on.
// Don't make this a AND term, as it's unlikely to need to test this.
@@ -342,9 +365,54 @@ private:
} else if (nodep->displayType() == AstDisplayType::DT_ERROR
|| nodep->displayType() == AstDisplayType::DT_FATAL) {
replaceDisplay(nodep, "%%Error");
} else if (nodep->displayType() == AstDisplayType::DT_MONITOR) {
nodep->displayType(AstDisplayType::DT_DISPLAY);
const auto fl = nodep->fileline();
const auto monNum = ++m_monitorNum;
// Where $monitor was we do "__VmonitorNum = N;"
const auto newsetp = new AstAssign{fl, newMonitorNumVarRefp(nodep, VAccess::WRITE),
new AstConst{fl, monNum}};
nodep->replaceWith(newsetp);
// Add "always_comb if (__VmonitorOn && __VmonitorNum==N) $display(...);"
AstNode* stmtsp = nodep;
AstIf* ifp = new AstIf{
fl,
new AstLogAnd{fl, new AstLogNot{fl, newMonitorOffVarRefp(nodep, VAccess::READ)},
new AstEq{fl, new AstConst{fl, monNum},
newMonitorNumVarRefp(nodep, VAccess::READ)}},
stmtsp, nullptr};
ifp->branchPred(VBranchPred::BP_UNLIKELY);
AstNode* newp = new AstAlwaysPostponed{fl, ifp};
m_modp->addStmtp(newp);
} else if (nodep->displayType() == AstDisplayType::DT_STROBE) {
nodep->displayType(AstDisplayType::DT_DISPLAY);
// Need one-shot
const auto fl = nodep->fileline();
const auto varp
= new AstVar{fl, AstVarType::MODULETEMP, "__Vstrobe" + cvtToStr(m_modStrobeNum++),
nodep->findBitDType()};
m_modp->addStmtp(varp);
// Where $strobe was we do "__Vstrobe = '1;"
const auto newsetp = new AstAssign{fl, new AstVarRef{fl, varp, VAccess::WRITE},
new AstConst{fl, AstConst::BitTrue{}}};
nodep->replaceWith(newsetp);
// Add "always_comb if (__Vstrobe) begin $display(...); __Vstrobe = '0; end"
AstNode* stmtsp = nodep;
AstIf* ifp = new AstIf{fl, new AstVarRef{fl, varp, VAccess::READ}, stmtsp, nullptr};
ifp->branchPred(VBranchPred::BP_UNLIKELY);
AstNode* newp = new AstAlwaysPostponed{fl, ifp};
stmtsp->addNext(new AstAssign{fl, new AstVarRef{fl, varp, VAccess::WRITE},
new AstConst{fl, AstConst::BitFalse{}}});
m_modp->addStmtp(newp);
}
}
virtual void visit(AstMonitorOff* nodep) override {
const auto newp
= new AstAssign(nodep->fileline(), newMonitorOffVarRefp(nodep, VAccess::WRITE),
new AstConst(nodep->fileline(), AstConst::BitTrue{}, nodep->off()));
nodep->replaceWith(newp);
VL_DO_DANGLING(pushDeletep(nodep), nodep);
}
virtual void visit(AstAssert* nodep) override {
iterateChildren(nodep);
newPslAssertion(nodep, nodep->failsp());
@@ -362,9 +430,11 @@ private:
virtual void visit(AstNodeModule* nodep) override {
VL_RESTORER(m_modp);
VL_RESTORER(m_modPastNum);
VL_RESTORER(m_modStrobeNum);
{
m_modp = nodep;
m_modPastNum = 0;
m_modStrobeNum = 0;
iterateChildren(nodep);
}
}