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Refactor Dfg variable flags (#6259)

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Store all flags in a DfgVertexVar relating to the underlying
AstVar/AstVarScope stored via AstNode::user1(). user2/user3/user4 are
then usable by DFG algorithms as needed.
This commit is contained in:
Geza Lore
2025-08-05 10:24:54 +01:00
committed by GitHub
parent d415757b0e
commit d2edab458e
8 changed files with 102 additions and 136 deletions
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src/V3DfgDfgToAst.cpp
+7 -7
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@@ -129,8 +129,8 @@ template <bool T_Scoped>
class DfgToAstVisitor final : DfgVisitor {
// NODE STATE
// AstScope::user1p // The combinational AstActive under this scope
const VNUser1InUse m_user1InUse;
// AstScope::user2p // The combinational AstActive under this scope
const VNUser2InUse m_user2InUse;
// TYPES
using VariableType = std::conditional_t<T_Scoped, AstVarScope, AstVar>;
@@ -152,28 +152,28 @@ class DfgToAstVisitor final : DfgVisitor {
}
static AstActive* getCombActive(AstScope* scopep) {
if (!scopep->user1p()) {
if (!scopep->user2p()) {
// Try to find the existing combinational AstActive
for (AstNode* nodep = scopep->blocksp(); nodep; nodep = nodep->nextp()) {
AstActive* const activep = VN_CAST(nodep, Active);
if (!activep) continue;
if (activep->hasCombo()) {
scopep->user1p(activep);
scopep->user2p(activep);
break;
}
}
// If there isn't one, create a new one
if (!scopep->user1p()) {
if (!scopep->user2p()) {
FileLine* const flp = scopep->fileline();
AstSenTree* const senTreep
= new AstSenTree{flp, new AstSenItem{flp, AstSenItem::Combo{}}};
AstActive* const activep = new AstActive{flp, "", senTreep};
activep->sensesStorep(senTreep);
scopep->addBlocksp(activep);
scopep->user1p(activep);
scopep->user2p(activep);
}
}
return VN_AS(scopep->user1p(), Active);
return VN_AS(scopep->user2p(), Active);
}
AstNodeExpr* convertDfgVertexToAstNodeExpr(DfgVertex* vtxp) {