libdwfl: Add dwfl_module_addrsym_elf and dwfl_module_getsym_elf.

Introduce two new functions that also return the elf associated with a
symbol to make symbol section indexing work for non-special sections.
Simplify code by removing dwfl_file where appropriate and just track Elf
directly. Document limitations of shndx with existing dwfl_module_addrsym
and dwfl_module_getsym. Extend dwflsyms testcase to check some more symbol
and section (index) properties.

Signed-off-by: Mark Wielaard <mjw@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/libdw/libdw.map b/libdw/libdw.map
index 060c3df8..0438e24c 100644
--- a/libdw/libdw.map
+++ b/libdw/libdw.map
@@ -283,4 +283,7 @@ ELFUTILS_0.158 {
     dwfl_getthreads;
     dwfl_thread_getframes;
     dwfl_frame_pc;
+
+    dwfl_module_addrsym_elf;
+    dwfl_module_getsym_elf;
 } ELFUTILS_0.157;