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From: "wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug bpf/28285] Allow stapbpf backend to handle $arg1, $arg2, ...
Date: Thu, 02 Sep 2021 19:23:59 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28285

--- Comment #1 from William Cohen <wcohen at redhat dot com> ---
The issue is occuring because tapsets.cxx is writing the code for the acces=
s to
the argument in tapsets.cxx
sdt_uprobe_var_expanding_visitor::try_parse_arg_register  around line 7053.=
=20
Later on the bpf-translate.cxx has no way of converting that magic string
containing the code to access an SDT marker argument into bpf.

There is similar generation of strings containing code in the following sdt
methods:


sdt_uprobe_var_expanding_visitor::try_parse_arg_register (target_symbol *e,
                                                          const string& asm=
arg,
                                                          long precision)

sdt_uprobe_var_expanding_visitor::try_parse_arg_offset_register (target_sym=
bol
*e,
                                                                 const stri=
ng&
asmarg,
                                                                 long
precision)

sdt_uprobe_var_expanding_visitor::try_parse_arg_effective_addr (target_symb=
ol
*e,
                                                                const strin=
g&
asmarg,
                                                                long precis=
ion)

sdt_uprobe_var_expanding_visitor::try_parse_arg_varname (target_symbol *e,
                                                         const string& asma=
rg,
                                                         long precision)

--=20
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