C++ target , memory leak / crash

[Koen Samyn]

Some problems with the C++ target:

1. Following code crashes with the deletion of the parse tree
2. If I use Ref with the parse tree then the program also crashes when the shared_ptr deletes the ptr.
3. Not deleting and not using the Ref obviously leads to memory leaks.

Anybody know how to fix this?

void parse(std::ifstream& stream) {

if (stream.is_open())

{

ANTLRInputStream input(stream);

textworldLexer lexer(&input);

CommonTokenStream tokens(&lexer);

textworldParser parser(&tokens);

tree::ParseTree* tree = parser.world();

Ref<textworldVisitor> visitor(new MyVisitor());

visitor->visit(tree);

delete tree;

getchar();

}

}

[Mike Lischke]

Hi Koen,

1. Following code crashes with the deletion of the parse tree
2. If I use Ref with the parse tree then the program also crashes when the shared_ptr deletes the ptr.
3. Not deleting and not using the Ref obviously leads to memory leaks.

I wrote an own paragraph in the C++ target description about that: https://github.com/antlr/antlr4/blob/master/doc/cpp-target.md#memory-management.

General rule: don't try to manage raw pointers from the runtime, they are all managed internally.

Mike
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