weixing ji <bit...@gmail.com> writes:
> I am writing a plugin which is invoked at the event
> "PLUGIN_OVERRIDE_GATE". My question is how to access all the local
> variables of a function if I get a FUNC_DECL tree node. I have tried
> as following:
> for(block = DECL_INITIAL(fn_decl); block; block = TREE_CHAIN(block))
> {
> for (temp = BLOCK_VARS (block); temp; temp = TREE_CHAIN (temp))
> {
> cerr << tree_code_name[TREE_CODE(temp)] << ;
> }
> }
> But this code does not work and it results in a segment fault. Could
> someone tell me how to do that?
A good way to pin down problems of this sort is to compile your plugin
with -DENABLE_TREE_CHECKING. That will cause the macros in tree.h to
check that they are being invoked reasonably.
However, I do not know what the problem is here. You should probably
write this code using BLOCK_CHAIN and DECL_CHAIN rather than TREE_CHAIN,
but those two both expand to TREE_CHAIN anyhow so I don't see why it
would matter.
Ian
