diff options
Diffstat (limited to 'translate.cxx')
| -rw-r--r-- | translate.cxx | 72 |
1 files changed, 70 insertions, 2 deletions
diff --git a/translate.cxx b/translate.cxx index a7caf0bd..981d71df 100644 --- a/translate.cxx +++ b/translate.cxx @@ -2362,6 +2362,72 @@ c_unparser::visit_functioncall (functioncall* e) } + +int +emit_symbol_data (systemtap_session& s) +{ + int rc = 0; + + // Instead of processing elf symbol tables, for now we just snatch + // /proc/kallsyms and convert it to our use. We need it sorted by + // address (so we can binary search) , and filtered (to show text + // symbols only), a task that we defer to grep(1) and sort(1). It + // may be useful to cache the symbols.sorted file, perhaps indexed + // by md5sum(/proc/modules), but let's not until this simple method + // proves too costly. All that LC_ALL=C stuff is there to avoid the + // excessive penalty of i18n code in some glibc/coreutils versions. + + string sorted_kallsyms = s.tmpdir + "/symbols.sorted"; + string sortcmd = "/bin/env LC_ALL=C /bin/grep \" [tT] \" /proc/kallsyms | "; + + sortcmd += "/bin/env LC_ALL=C /bin/sort "; +#if __LP64__ + sortcmd += "-k 1,16 "; +#else + sortcmd += "-k 1,8 "; +#endif + sortcmd += "-s -o " + sorted_kallsyms; + + if (s.verbose) clog << "Running " << sortcmd << endl; + rc = system(sortcmd.c_str()); + if (rc == 0) + { + ifstream kallsyms (sorted_kallsyms.c_str()); + + unsigned i=0; + s.op->newline() << "struct stap_symbol stap_symbols [] = {"; + s.op->indent(1); + string lastaddr; + while (! kallsyms.eof()) + { + string addr, type, sym, module; + kallsyms >> addr >> type >> sym; + kallsyms >> ws; + if (kallsyms.peek() == '[') + { + string bracketed; + kallsyms >> bracketed; + module = bracketed.substr (1, bracketed.length()-2); + } + + // NB: kallsyms includes some duplicate addresses + if ((type == "t" || type == "T") && lastaddr != addr) + { + s.op->newline() << "{ 0x" << addr << ", " + << "\"" << sym << "\", " + << "\"" << module << "\" },"; + lastaddr = addr; + i ++; + } + } + s.op->newline(-1) << "};"; + s.op->newline() << "unsigned stap_num_symbols = " << i << ";" << endl; + } + + return rc; +} + + int translate_pass (systemtap_session& s) { @@ -2468,16 +2534,18 @@ translate_pass (systemtap_session& s) s.op->newline() << "MODULE_DESCRIPTION(\"systemtap probe\");"; s.op->newline() << "MODULE_LICENSE(\"GPL\");"; // XXX s.op->newline() << "#endif"; - - s.op->line() << endl; } catch (const semantic_error& e) { s.print_error (e); } + rc |= emit_symbol_data (s); + s.op->line() << endl; + delete s.op; s.op = 0; s.up = 0; + return rc + s.num_errors; } |