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IEEE compliant scheduler (#3384)

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This is a major re-design of the way code is scheduled in Verilator,
with the goal of properly supporting the Active and NBA regions of the
SystemVerilog scheduling model, as defined in IEEE 1800-2017 chapter 4.

With this change, all internally generated clocks should simulate
correctly, and there should be no more need for the `clock_enable` and
`clocker` attributes for correctness in the absence of Verilator
generated library models (`--lib-create`).

Details of the new scheduling model and algorithm are provided in
docs/internals.rst.

Implements #3278
This commit is contained in:
Geza Lore
2022-05-15 16:03:32 +01:00
committed by GitHub
parent 39b7c47e7b
commit 599d23697d
157 changed files with 6386 additions and 4395 deletions
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src/V3Task.cpp
+6 -5
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@@ -1056,17 +1056,18 @@ private:
}
AstVarScope* makeDpiExporTrigger() {
AstVarScope* dpiExportTriggerp = v3Global.rootp()->dpiExportTriggerp();
AstNetlist* const netlistp = v3Global.rootp();
AstVarScope* dpiExportTriggerp = netlistp->dpiExportTriggerp();
if (!dpiExportTriggerp) {
// Create the global DPI export trigger flag the first time we encounter a DPI export.
// This flag is set any time a DPI export is invoked, and cleared at the end of eval.
FileLine* const fl = m_topScopep->fileline();
AstVar* const varp
= new AstVar{fl, VVarType::VAR, "__Vdpi_export_trigger", VFlagBitPacked{}, 1};
const string name{"__Vdpi_export_trigger"};
AstVar* const varp = new AstVar{fl, VVarType::VAR, name, VFlagBitPacked{}, 1};
m_topScopep->scopep()->modp()->addStmtp(varp);
dpiExportTriggerp = new AstVarScope{fl, m_topScopep->scopep(), varp};
m_topScopep->scopep()->addVarp(dpiExportTriggerp);
v3Global.rootp()->dpiExportTriggerp(dpiExportTriggerp);
netlistp->dpiExportTriggerp(dpiExportTriggerp);
}
return dpiExportTriggerp;
}
@@ -1309,7 +1310,7 @@ private:
AstAlways* const alwaysp = new AstAlways{
fl, VAlwaysKwd::ALWAYS,
new AstSenTree{
fl, new AstSenItem{fl, VEdgeType::ET_HIGHEDGE,
fl, new AstSenItem{fl, VEdgeType::ET_DPIEXPORT,
new AstVarRef{fl, dpiExportTriggerp, VAccess::READ}}},
nullptr};
for (AstVarScope* const varScopep : writtenps) {