[Bug translator/27984] stap skipping partially-inlined instance, but it is not inline function actually

["wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27984

--- Comment #8 from William Cohen <wcohen at redhat dot com> ---
To better check what was going on I added the following patch to see what
offsets were being used and found that the libssl.so.1.1 library had a bias of
0x10000 for the addresses:

diff --git a/tapsets.cxx b/tapsets.cxx
index 20e0cb68f..251e2a4b6 100644
--- a/tapsets.cxx
+++ b/tapsets.cxx
@@ -2280,9 +2280,14 @@ query_dwarf_func (Dwarf_Die * func, dwarf_query * q)
               // up the ELF symbol name and rely on a heuristic.
               GElf_Sym sym;
               GElf_Off off = 0;
-              const char *name = dwfl_module_addrinfo (q->dw.module, entrypc,
+             Dwarf_Addr bias = 0x10000;
+
+             const char *name = dwfl_module_addrinfo (q->dw.module, entrypc +
bias,
                                                        &off, &sym, NULL, NULL,
NULL);

+             if (q->sess.verbose>2)
+                     clog << _F("%s = dwfl_module_addrinfo(entrypc=%p,
off=%p)\n",
+                                name, (void*)entrypc, (void*) off);
               if (name != NULL && strstr(name, ".part.") != NULL)
                 {
                   if (q->sess.verbose>2)



With this patch see that the code is finding the correct function names for the
library functions:

focused on module
'/tmp/stap-job1/sysroot/usr/local/openresty/openssl/lib/libssl.so.1.1'
selected function BIO_new_ssl
BIO_new_ssl = dwfl_module_addrinfo(entrypc=0x1f760, off=(nil))
selected function BIO_new_ssl_connect
BIO_new_ssl_connect = dwfl_module_addrinfo(entrypc=0x1f7e0, off=(nil))
selected function ssl_puts
ssl_puts = dwfl_module_addrinfo(entrypc=0x1ed10, off=(nil))
selected function ssl_new
ssl_new = dwfl_module_addrinfo(entrypc=0x1ed40, off=(nil))
selected function BIO_ssl_shutdown
BIO_ssl_shutdown = dwfl_module_addrinfo(entrypc=0x1f960, off=(nil))
selected function ssl_callback_ctrl
ssl_callback_ctrl = dwfl_module_addrinfo(entrypc=0x1ecd0, off=(nil))

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