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// Synthetic derived probe group that enables merging probes from
// difference derived probe groups for dyninst.
//
// Copyright (C) 2013 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
#include "session.h"
#include "tapsets.h"
#include "tapset-dynprobe.h"
#include "translate.h"
#include <cstring>
#include <string>
using namespace std;
using namespace __gnu_cxx;
// ------------------------------------------------------------------------
// dynprobe derived 'probes': These don't really exist. The purpose of
// the dynprobe_derived_probe_group is allow multiple
// *_derived_probe_group classes to output only one set of
// 'stapdu_target'/'stapdu_probe' arrays. This class also includes
// "dyninst/uprobes.c" only once and in the correct place.
// ------------------------------------------------------------------------
struct dynprobe_derived_probe: public derived_probe
{
// Dummy constructor for gcc 3.4 compatibility
dynprobe_derived_probe (): derived_probe (0, 0) { assert(0); }
};
struct dynprobe_info
{
bool has_path;
const Dwarf_Addr offset;
const Dwarf_Addr semaphore_addr;
const string flags_string;
const string probe_init;
dynprobe_info(bool hp, const Dwarf_Addr o, const Dwarf_Addr sa,
const string fs, const string pi):
has_path(hp), offset(o), semaphore_addr(sa), flags_string(fs),
probe_init(pi) { }
};
struct dynprobe_derived_probe_group: public generic_dpg<dynprobe_derived_probe>
{
private:
map<string, vector<dynprobe_info*> > info_by_path;
typedef map<string, vector<dynprobe_info*> >::iterator i_b_path_iterator;
map<Dwarf_Addr, vector<dynprobe_info*> > info_by_pid;
typedef map<Dwarf_Addr, vector<dynprobe_info*> >::iterator i_b_pid_iterator;
void emit_info(systemtap_session& s, unsigned tgt_idx, dynprobe_info *info);
public:
void emit_module_decls (systemtap_session& s);
void emit_module_init (systemtap_session& ) { }
void emit_module_post_init (systemtap_session& ) { }
void emit_module_exit (systemtap_session& ) { }
void add(const string& path, const Dwarf_Addr offset,
const Dwarf_Addr semaphore_addr, const string& flags_string,
const string& probe_init);
};
void
dynprobe_derived_probe_group::add(const string& path, const Dwarf_Addr offset,
const Dwarf_Addr semaphore_addr,
const string& flags_string,
const string& probe_init)
{
struct dynprobe_info *info = new dynprobe_info(!path.empty(), offset,
semaphore_addr,
flags_string, probe_init);
if (!path.empty())
info_by_path[path].push_back(info);
else
info_by_pid[offset].push_back(info);
}
void
dynprobe_derived_probe_group::emit_info(systemtap_session& s,
unsigned tgt_idx, dynprobe_info *info)
{
s.op->newline() << "{";
s.op->line() << " .target=" << tgt_idx << ",";
// We have to force path vs. pid probes into
// stapdu_target/stapdu_probe. So, here's how we'll do it.
//
// For path probes, stapdu_target will hold the path, and the
// stapdu_probe with the correct index will point to it.
//
// For pid probes, stapdu_target will have an empty path, and the
// 'offset' field of stapdu_probe will really be the pid.
if (info->has_path)
s.op->line() << " .offset=" << lex_cast_hex(info->offset) << "ULL,";
else
s.op->line() << " .offset=" << info->offset << "ULL/*pid*/,";
if (info->semaphore_addr)
s.op->line() << " .semaphore=" << lex_cast_hex(info->semaphore_addr)
<< "ULL,";
s.op->line() << " .flags=" << info->flags_string << ",";
s.op->line() << " .probe=" << info->probe_init << ",";
s.op->line() << " },";
}
void
dynprobe_derived_probe_group::emit_module_decls (systemtap_session& s)
{
if (! s.runtime_usermode_p())
return;
s.op->newline() << "#include \"dyninst/uprobes.h\"";
s.op->newline() << "static const struct stapdu_target stapdu_targets[] = {";
s.op->indent(1);
for (i_b_path_iterator it = info_by_path.begin();
it != info_by_path.end(); it++)
{
s.op->newline() << "{";
s.op->line() << " .path=" << lex_cast_qstring(it->first) << ",";
s.op->line() << " },";
}
if (! info_by_pid.empty())
{
s.op->newline() << "{";
s.op->line() << " .path=NULL,";
s.op->line() << " },";
}
s.op->newline(-1) << "};";
s.op->assert_0_indent();
s.op->newline() << "static struct stapdu_probe stapdu_probes[] = {";
s.op->indent(1);
unsigned tgt_idx = 0;
for (i_b_path_iterator it = info_by_path.begin();
it != info_by_path.end(); it++, tgt_idx++)
{
for (unsigned i = 0; i < it->second.size(); i++)
{
dynprobe_info *info = it->second[i];
emit_info(s, tgt_idx, info);
}
}
if (! info_by_pid.empty())
{
for (i_b_pid_iterator it = info_by_pid.begin();
it != info_by_pid.end(); it++)
{
for (unsigned i = 0; i < it->second.size(); i++)
{
dynprobe_info *info = it->second[i];
emit_info(s, tgt_idx, info);
}
}
}
s.op->newline(-1) << "};";
s.op->assert_0_indent();
s.op->newline() << "#include \"dyninst/uprobes.c\"";
}
// Declare that dynprobes are needed in this session
void enable_dynprobes(systemtap_session& s)
{
if (! s.dynprobe_derived_probes)
s.dynprobe_derived_probes = new dynprobe_derived_probe_group();
}
void
dynprobe_add_uprobe(systemtap_session& s, const string& path,
const Dwarf_Addr offset, const Dwarf_Addr semaphore_addr,
const string flags_string, const string probe_init)
{
enable_dynprobes(s);
s.dynprobe_derived_probes->add(path, offset, semaphore_addr, flags_string,
probe_init);
}
void
dynprobe_add_utrace_path(systemtap_session& s, const std::string& path,
const std::string flags_string,
const std::string probe_init)
{
enable_dynprobes(s);
s.dynprobe_derived_probes->add(path, 0, 0, flags_string, probe_init);
}
void
dynprobe_add_utrace_pid(systemtap_session& s, const Dwarf_Addr pid,
const std::string flags_string,
const std::string probe_init)
{
enable_dynprobes(s);
// Notice we're passing the pid as the offset. Stapdyn is expecting
// this when the path is empty.
s.dynprobe_derived_probes->add("", pid, 0, flags_string, probe_init);
}
/* vim: set sw=2 ts=8 cino=>4,n-2,{2,^-2,t0,(0,u0,w1,M1 : */
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