ANTLR4 C++ listener not calling overriden enterRule methods - antlr

Question

I need some help with walking a tree with a listener (using C++). After initiating the tree walk with my listener and using gdb to attach to the process (I built the C++ runtime library with the Debug flag to be able to have the debug info in gdb), I can see it enters ParseTreeWalker::walk(), and if I execute getText() on the ParseTree* parameter I can see it has all the tokens from my input, so far so good. But when walk() calls enterRule():
void ParseTreeWalker::enterRule(ParseTreeListener *listener, ParseTree *r) const {
auto *ctx = downCast<ParserRuleContext*>(r);
listener->enterEveryRule(ctx);
ctx->enterRule(listener);
}
When I try to step in ctx->enterRule(listener) it just goes back to walk(). I've added breakpoints to my listener methods I want to debug but it appears they're not being called. I even added some std::cout statements in them but I don't see them being executed. I also added some std::cout statements to my overriden version of visitTerminal and those are getting printed...
If I inspect the ctx variable inside this method, it does seem to have the right type
_vptr.ParseTree = 0x6e6048 <vtable for MyParser::DocumentContext+16>...
So, I'm very confused, am I missing something obvious that's causing my enter* methods not get executed?
The generated BaseListener looks like this:
#include "antlr4-runtime.h"
#include "MyDCXParserListener.h"
class MyDCXParserBaseListener : public MyDCXParserListener {
public:
virtual void enterDocument(MyDCXParser::DocumentContext * /*ctx*/) override { }
virtual void exitDocument(MyDCXParser::DocumentContext * /*ctx*/) override { }
virtual void enterLine(MyDCXParser::LineContext * /*ctx*/) override { }
virtual void exitLine(MyDCXParser::LineContext * /*ctx*/) override { }
virtual void enterEveryRule(antlr4::ParserRuleContext * /*ctx*/) override { }
virtual void exitEveryRule(antlr4::ParserRuleContext * /*ctx*/) override { }
virtual void visitTerminal(antlr4::tree::TerminalNode * /*node*/) override { }
virtual void visitErrorNode(antlr4::tree::ErrorNode * /*node*/) override { }
};
The derived class I created looks like this:
.h
#include "antlr4-runtime.h"
#include "MyDCXParser.h"
#include "MyDCXParserBaseListener.h"
#include <iostream>
using namespace std;
class MyDCXListener : public MyDCXParserBaseListener
{
private:
public:
//
MyDCXListener();
//
~MyDCXListener();
// Don't allow copy constructor nor assignment operator
MyDCXListener(const MyDCXListener&) = delete;
MyDCXListener& operator=(const MyDCXListener&) = delete;
//
void enterDocument(MyDCXParser::DocumentContext * /*ctx*/) override;
void exitDocument(MyDCXParser::DocumentContext * /*ctx*/) override {}
void enterLine(MyDCXParser::LineContext * /*ctx*/) override;
void exitLine(MyDCXParser::LineContext * /*ctx*/) override {}
void visitTerminal(antlr4::tree::TerminalNode *node) override { std::cout << "visitTerminal(): '" << node->getText().c_str() << std::endl; }
};
.cpp
#include "MyDCXListener.h"
//
MyDCXListener::MyDCXListener()
{
}
MyDCXListener::~MyDCXListener()
{
}
void MyDCXListener::enterDocument(MyDCXParser::DocumentContext * ctx)
{
std::cout << "MyDCXListener::enterDocument()" << std::endl;
}
void MyDCXListener::enterLine(MyDCXParser::LineContext * ctx)
{
std::cout << "MyDCXListener::enterLine()" << std::endl;
}
I see the "visitTerminal" message but not the ones for enterDocument() nor enterLine()