On Wed, Dec 4, 2019 at 6:03 PM Erick Ochoa <erick.oc...@theobroma-systems.com> wrote: > > > > On 2019-12-04 7:52 a.m., Richard Biener wrote: > > On Tue, Dec 3, 2019 at 11:51 PM Erick Ochoa > > <erick.oc...@theobroma-systems.com> wrote: > >> > >> Hi, > >> > >> I am trying to use the function: `cgraph_node::get_untransformed_body` > >> during > >> the wpa stage of a SIMPLE_IPA_PASS transformation. While the execute > >> function > > > > I think SIMPLE_IPA_PASSes have no "WPA" stage but run at LTRANS time > > (WPA transform stage). So you might simply see that not all bodies are > > available in your LTRANS unit? > > > > This makes a lot of sense, and it is indeed documented in the GCC internals > manual: > > A small inter-procedural pass (SIMPLE_IPA_PASS) is a pass that does > everything at once and thus it can not be executed during WPA in WHOPR > mode. It defines only the Execute stage and during this stage it > accesses and modifies the function bodies. Such passes are useful for > optimization at LGEN or LTRANS time and are used, for example, to > implement early optimization before writing object files. > > I got confused because the dump_file for my pass includes the substring 'wpa'. > Should I file a bug to change the name of the dumpfile to something more like > `ltrans*`?
Well, you probably placed your pass in the IPA pipeline rather than the all_late_ipa_passes one? In principle IPA passes _can_ pull in bodies during WPA analysis, that just will be very costly. > Thanks for your help! > > >> is running, I need to access the body of a function in order to iterate > >> over > >> the gimple instructions in the first basic block. I have found that the > >> majority of the cgraph_node will return successfully. However, there are > >> some > >> functions which consistently produce a segmentation fault following this > >> stacktrace: > >> > >> ``` > >> 0xbc2adb crash_signal > >> /home/eochoa/code/gcc/gcc/toplev.c:328 > >> 0xa54858 lto_get_decl_name_mapping(lto_file_decl_data*, char const*) > >> /home/eochoa/code/gcc/gcc/lto-section-in.c:367 > >> 0x7030e7 cgraph_node::get_untransformed_body() > >> /home/eochoa/code/gcc/gcc/cgraph.c:3516 > >> 0x150613f get_bb1_callees > >> /home/eochoa/code/gcc/gcc/ipa-initcall-cp.c:737 > >> 0x150613f reach_nodes_via_bb1_dfs > >> ``` > >> > >> Is there a way for `cgraph_node::get_untransformed_body` to succeed > >> consistently? (I.e. are there some preconditions that I need to make sure > >> are > >> in place before calling cgraph_node::get_untransformed_body? > >> > >> I am using gcc version 10.0.0 20191127 (experimental) > >> > >> Thanks
