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Remove unhelpful DFG debug dumps

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This commit is contained in:
Geza Lore
2025-08-05 05:06:44 +01:00
parent 7d2b6bd921
commit d415757b0e
3 changed files with 24 additions and 78 deletions
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src/V3Dfg.cpp
+24 -71
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@@ -407,41 +407,6 @@ void DfgGraph::dumpDotFilePrefixed(const string& label) const {
dumpDotFile(v3Global.debugFilename(filename) + ".dot", label);
}
// Dump upstream logic cone starting from given vertex
static void dumpDotUpstreamConeFromVertex(std::ostream& os, const DfgVertex& vtx) {
// Work queue for depth first traversal starting from this vertex
std::vector<const DfgVertex*> queue{&vtx};
// Set of already visited vertices
std::unordered_set<const DfgVertex*> visited;
// Depth first traversal
while (!queue.empty()) {
// Pop next work item
const DfgVertex* const itemp = queue.back();
queue.pop_back();
// Mark vertex as visited
const bool isFirstEncounter = visited.insert(itemp).second;
// If we have already visited this vertex during the traversal, then move on.
if (!isFirstEncounter) continue;
// Enqueue all sources of this vertex.
itemp->forEachSource([&](const DfgVertex& src) { queue.push_back(&src); });
// Emit this vertex and all of its source edges
dumpDotVertexAndSourceEdges(os, *itemp);
}
// Emit all DfgVarPacked vertices that have external references driven by this vertex
vtx.forEachSink([&](const DfgVertex& dst) {
if (const DfgVarPacked* const varVtxp = dst.cast<DfgVarPacked>()) {
if (varVtxp->hasNonLocalRefs()) dumpDotVertexAndSourceEdges(os, dst);
}
});
}
// LCOV_EXCL_START // Debug function for developer use only
void DfgGraph::dumpDotUpstreamCone(const string& fileName, const DfgVertex& vtx,
const string& name) const {
@@ -454,8 +419,30 @@ void DfgGraph::dumpDotUpstreamCone(const string& fileName, const DfgVertex& vtx,
if (!name.empty()) *os << "graph [label=\"" << name << "\", labelloc=t, labeljust=l]\n";
*os << "graph [rankdir=LR]\n";
// Dump the cone
dumpDotUpstreamConeFromVertex(*os, vtx);
// Work queue for depth first traversal starting from this vertex
std::vector<const DfgVertex*> queue{&vtx};
// Set of already visited vertices
std::unordered_set<const DfgVertex*> visited;
// Depth first traversal
while (!queue.empty()) {
// Pop next work item
const DfgVertex* const vtxp = queue.back();
queue.pop_back();
// Mark vertex as visited
const bool isFirstEncounter = visited.insert(vtxp).second;
// If we have already visited this vertex during the traversal, then move on.
if (!isFirstEncounter) continue;
// Enqueue all sources of this vertex.
vtxp->forEachSource([&](const DfgVertex& src) { queue.push_back(&src); });
// Emit this vertex and all of its source edges
dumpDotVertexAndSourceEdges(*os, *vtxp);
}
// Footer
*os << "}\n";
@@ -465,40 +452,6 @@ void DfgGraph::dumpDotUpstreamCone(const string& fileName, const DfgVertex& vtx,
}
// LCOV_EXCL_STOP
void DfgGraph::dumpDotAllVarConesPrefixed(const string& label) const {
const string prefix = label.empty() ? name() + "-cone-" : name() + "-" + label + "-cone-";
forEachVertex([&](const DfgVertex& vtx) {
// Check if this vertex drives a variable referenced outside the DFG.
const DfgVarPacked* const sinkp
= vtx.findSink<DfgVarPacked>([](const DfgVarPacked& sink) { //
return sink.hasNonLocalRefs();
});
// We only dump cones driving an externally referenced variable
if (!sinkp) return;
// Open output file
const string coneName{prefix + sinkp->nodep()->name()};
const string fileName{v3Global.debugFilename(coneName) + ".dot"};
const std::unique_ptr<std::ofstream> os{V3File::new_ofstream(fileName)};
if (os->fail()) v3fatal("Can't write file: " << fileName);
// Header
*os << "digraph dfg {\n";
*os << "graph [label=\"" << coneName << "\", labelloc=t, labeljust=l]\n";
*os << "graph [rankdir=LR]\n";
// Dump this cone
dumpDotUpstreamConeFromVertex(*os, vtx);
// Footer
*os << "}\n";
// Done with this logic cone
os->close();
});
}
//------------------------------------------------------------------------------
// DfgEdge
//------------------------------------------------------------------------------