Internals: Make AstAlwaysPost an AstNodeProcedure. (verilator#2959)

This seems to belong there, eliminates some code duplication in V3Clock,
and also enables splitting AstAlwaysPost statements into different
functions in V3Order, but should otherwise have little effect.

src/V3AstNodes.h

@@ -3349,6 +3349,7 @@ class AstAlways final : public AstNodeProcedure {
     void sensesp(AstSenTree* nodep) { setOp1p(nodep); }
     VAlwaysKwd keyword() const { return m_keyword; }
 };
+
 class AstAlwaysPostponed final : public AstNodeProcedure {
     // Like always but postponement scheduling region
 
@@ -3358,6 +3359,16 @@ class AstAlwaysPostponed final : public AstNodeProcedure {
     ASTNODE_NODE_FUNCS(AlwaysPostponed)
 };
 
+class AstAlwaysPost final : public AstNodeProcedure {
+    // Like always but post assignments for memory assignment IFs
+public:
+    AstAlwaysPost(FileLine* fl, AstSenTree* sensesp, AstNode* bodysp)
+        : ASTGEN_SUPER(fl, bodysp) {
+        addNOp1p(sensesp);
+    }
+    ASTNODE_NODE_FUNCS(AlwaysPost)
+};
+
 class AstAlwaysPublic final : public AstNodeStmt {
     // "Fake" sensitivity created by /*verilator public_flat_rw @(edgelist)*/
     // Body statements are just AstVarRefs to the public signals
@@ -3378,20 +3389,6 @@ class AstAlwaysPublic final : public AstNodeStmt {
     bool isJustOneBodyStmt() const { return bodysp() && !bodysp()->nextp(); }
 };
 
-class AstAlwaysPost final : public AstNode {
-    // Like always but post assignments for memory assignment IFs
-public:
-    AstAlwaysPost(FileLine* fl, AstSenTree* sensesp, AstNode* bodysp)
-        : ASTGEN_SUPER(fl) {
-        addNOp1p(sensesp);
-        addNOp2p(bodysp);
-    }
-    ASTNODE_NODE_FUNCS(AlwaysPost)
-    //
-    AstNode* bodysp() const { return op2p(); }  // op2 = Statements to evaluate
-    void addBodysp(AstNode* newp) { addOp2p(newp); }
-};
-
 class AstAssign final : public AstNodeAssign {
 public:
     AstAssign(FileLine* fl, AstNode* lhsp, AstNode* rhsp)

src/V3Clock.cpp

@@ -301,20 +301,6 @@ class ClockVisitor final : public AstNVisitor {
         }
         VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
     }
-    virtual void visit(AstAlwaysPost* nodep) override {
-        if (AstNode* stmtsp = nodep->bodysp()) {
-            stmtsp->unlinkFrBackWithNext();
-            nodep->addNextHere(stmtsp);
-        }
-        VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
-    }
-    virtual void visit(AstAlwaysPostponed* nodep) override {
-        if (AstNode* stmtsp = nodep->bodysp()) {
-            stmtsp->unlinkFrBackWithNext();
-            nodep->addNextHere(stmtsp);
-        }
-        VL_DO_DANGLING(nodep->unlinkFrBack()->deleteTree(), nodep);
-    }
     virtual void visit(AstCoverToggle* nodep) override {
         // nodep->dumpTree(cout, "ct:");
         // COVERTOGGLE(INC, ORIG, CHANGE) ->

src/V3Delayed.cpp

@@ -351,7 +351,7 @@ class DelayedVisitor final : public AstNVisitor {
                                    new AstVarRef(nodep->fileline(), setvscp, VAccess::READ),
                                    nullptr, nullptr);
             UINFO(9, "     Created " << postLogicp << endl);
-            finalp->addBodysp(postLogicp);
+            finalp->addStmtp(postLogicp);
             finalp->user3p(setvscp);  // Remember IF's vset variable
             finalp->user4p(postLogicp);  // and the associated IF, as we may be able to reuse it
         }