Debug: add GDB dtf function to dump tree to file

src/.gdbinit

@@ -19,6 +19,13 @@ document pnt
   Verilator: Print AstNode NODEP's tree
 end
 
+define dtf
+  call AstNode::dumpTreeFileGdb(0)
+end
+document dtf
+  Verilator: Dump AstNode tree to file
+end
+
 define watchedit
    watch AstNode::s_editCntGbl==$arg0
 end

src/V3Ast.cpp

@@ -946,15 +946,19 @@ void AstNode::dumpGdb() {  // For GDB only
     dumpGdbHeader();
     cout<<"  "; dump(cout); cout<<endl;
 }
+void AstNode::dumpGdbHeader() const {  // For GDB only
+    if (!this) { cout<<"This=NULL"<<endl; return; }
+    dumpPtrs(cout);
+    cout<<"  Fileline = "<<fileline()<<endl;
+}
 void AstNode::dumpTreeGdb() {  // For GDB only
     if (!this) { cout<<"This=NULL"<<endl; return; }
     dumpGdbHeader();
     dumpTree(cout);
 }
-void AstNode::dumpGdbHeader() const {  // For GDB only
-    if (!this) { cout<<"This=NULL"<<endl; return; }
-    dumpPtrs(cout);
-    cout<<"  Fileline = "<<fileline()<<endl;
+void AstNode::dumpTreeFileGdb(const char* filenamep) {  // For GDB only
+    string filename = filenamep ? filenamep : v3Global.debugFilename("debug.tree",98);
+    v3Global.rootp()->dumpTreeFile(filename);
 }
 
 void AstNode::dumpPtrs(ostream& os) const {

src/V3Ast.h

@@ -1109,6 +1109,7 @@ public:
     void	dumpTreeGdb(); // For GDB only
     void	dumpTreeAndNext(ostream& str=cout, const string& indent="    ", int maxDepth=0);
     void	dumpTreeFile(const string& filename, bool append=false);
+    static void	dumpTreeFileGdb(const char* filenamep=NULL);
 
     // METHODS - queries
     virtual bool isPure() const { return true; }	// Else a $display, etc, that must be ordered with other displays