IIUC if we want tree-sitter to use our malloc, we need to build it with Emacs, where should I put the source of tree-sitter?

tree-sitter itself should be a library we link against. If you meant
the tree-sitter support code, then it should go on a separate file in
src/. Or did I misunderstand your question?

If we link against libtree-sitter, how do we change its malloc behavior? Tree-sitter has these kind of things:

#ifndef ts_malloc

#define ts_malloc ts_malloc_default

#endif

So I assume we need to define ts_malloc to, say, xmalloc when compiling libtree-sitter. And if we only link to it, we can’t redefine ts_malloc.

Yuan