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Re: [C++ Patch] PR 44516


On 05/14/2012 05:58 AM, Jason Merrill wrote:
On 05/13/2012 11:24 PM, Paolo Carlini wrote:
     tree r = build_x_modify_expr
-      (RECUR (TREE_OPERAND (t, 0)),
+      (input_location,

Here I think EXPR_LOC_OR_HERE (TREE_OPERAND (t, 1)) is better.

Why? TREE_OPERAND (t,1) is a dummy tree that we only use for its code.
Ok... now I see.
Of course, currently it doesn't matter because we don't SET_EXPR_LOCATION on either the MODOP_EXPR or its operand 1, so EXPR_LOC_OR_HERE on either one will give input_location.
I guess we want a build_min_nt_loc function.
Indeed, and I can use it to handle the latter issue. I have a draft patch almost ready.

In terms of implementation details: the new _loc variant (I'm also finding useful a build_min_loc and a build_min_non_dep_loc, by the way) seems identical to the non-_loc variant besides calling SET_EXPR_LOCATION, thus I'm thinking: would it make sense to have the current non-_loc variants implemented in terms of the new ones and passing 0 as location_t and the _loc variant doing SET_EXPR_LOCATION (t, loc); only if loc != 0? Or we want to keep location_t opaque, I don't know, we want to do something slightly different?


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