forked from Imagelibrary/binutils-gdb
3396471b4c
Fortran provides additional entry points for subroutines and functions. These entry points may use only a subset (or a different set) of the parameters of the original subroutine. The entry points may be described via the DWARF tag DW_TAG_entry_point. This commit adds support for parsing the DW_TAG_entry_point DWARF tag. Currently, between ifx/ifort/gfortran, only ifort is actually emitting this tag. Both, ifx and gfortran use the DW_TAG_subprogram tag as workaround/alternative. Thus, this patch really only adds more ifort support. Even so, some of the attached tests still fail for ifort, due to some wrong line info generated for the entry points in ifort. After this patch it is possible to set a breakpoint in gdb with the ifort compiled example at the entry points 'foo' and 'foobar', which was not possible before. As gcc and ifx do not emit the tag I also added a test to gdb.dwarf2 which uses some underlying c compiled code and adds some Fortran style DWARF to it emitting the DW_TAG_entry_point. Before this patch it was not possible to actually define breakpoint at the entry point tags. For gfortran there actually exists a bug on bugzilla, asking for the use of DW_TAG_entry_point over DW_TAG_subprogram: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=37134 This patch was originally posted here https://sourceware.org/legacy-ml/gdb-patches/2017-07/msg00317.html but its review/pinging got lost after a while. I reworked it to fit the current GDB. Co-authored-by: Bernhard Heckel <bernhard.heckel@intel.com> Co-authored-by: Tim Wiederhake <tim.wiederhake@intel.com> Approved-by: Tom Tromey <tom@tromey.com>