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/**
* @file profile.h
* Encapsulation for samples files over all profile classes
* belonging to the same binary image
*
* @remark Copyright 2002 OProfile authors
* @remark Read the file COPYING
*
* @author Philippe Elie
* @author John Levon
*/
#ifndef PROFILE_H
#define PROFILE_H
#include <string>
#include <map>
#include <iterator>
#include "odb.h"
#include "op_types.h"
#include "utility.h"
#include "populate_for_spu.h"
class opd_header;
class op_bfd;
/**
* Class containing a single sample file contents.
* i.e. set of count values for VMA offsets for
* a particular binary.
*/
class profile_t : noncopyable {
public:
/**
* profile_t - construct an empty profile_t object
*/
profile_t();
/// return true if no sample file has been loaded
bool empty() const { return !file_header.get(); }
/// return the header of the last opened samples file
opd_header const & get_header() const {
return *file_header;
}
/**
* count samples count w/o recording them
* @param filename sample filename
*
* convenience interface for raw access to sample count w/o recording
* them. It's placed here so all access to samples files go through
* profile_t static or non static member.
*/
static count_type sample_count(std::string const & filename);
/**
* Indicate if given sample file is from a Cell Broadband Engine
* SPU profile
* @param filename sample filename
*
* Convenience interface put here so all access to samples files
* go through profile_t static or non static member.
*/
static enum profile_type is_spu_sample_file(std::string const & filename);
/**
* cumulate sample file to our container of samples
* @param filename sample file name
*
* store samples for one sample file, sample file header is sanitized.
*
* all error are fatal
*/
void add_sample_file(std::string const & filename);
/// Set an appropriate start offset, see comments below.
void set_offset(op_bfd const & abfd);
class const_iterator;
typedef std::pair<const_iterator, const_iterator> iterator_pair;
/**
* @param start start offset
* @param end end offset
*
* return an iterator pair to [start, end) range
*/
iterator_pair
samples_range(odb_key_t start, odb_key_t end) const;
/// return a pair of iterator for all samples
iterator_pair samples_range() const;
private:
/// helper for sample_count() and add_sample_file(). All error launch
/// an exception.
static void
open_sample_file(std::string const & filename, odb_t &);
/// copy of the samples file header
scoped_ptr<opd_header> file_header;
/// storage type for samples sorted by eip
typedef std::map<odb_key_t, count_type> ordered_samples_t;
/**
* Samples are stored in hash table, iterating over hash table don't
* provide any ordering, the above count() interface rely on samples
* ordered by eip. This map is only a temporary storage where samples
* are ordered by eip.
*/
ordered_samples_t ordered_samples;
/**
* For certain profiles, such as kernel/modules, and anon
* regions with a matching binary, this value is non-zero,
* and represents the file offset of the relevant section.
*
* For kernel profiles, this is done because we use the information
* provided in /proc/ksyms, which only gives the mapped position of
* .text, and the symbol _text from vmlinux. This value is used to fix
* up the sample offsets for kernel code as a result of this difference
*
* In user-space samples, the sample offset is from the start of the
* mapped file, as seen in /proc/pid/maps. This is fine for
* mappings of permanent files, but with anon mappings, we need
* to adjust the key values to be a file offset against the
* *binary* (if there is one). This can obviously be different.
* So we pass our anon mapping start VMA to op_bfd, which looks
* for a section with that VMA, then returns the section's
* filepos. So all is good.
*
* Finally, note that for cg we can't use this inside the
* profile_t, as we're storing two offsets in the key value. So
* we do it later in that case.
*
* Phew.
*/
u64 start_offset;
};
// It will be easier to derive profile_t::const_iterator from
// std::iterator<std::input_iterator_tag, unsigned int> but this doesn't
// work for gcc <= 2.95 so we provide the neccessary typedef in the hard way.
// See ISO C++ 17.4.3.1 § 1 and 14.7.3 § 9.
namespace std {
template <>
struct iterator_traits<profile_t::const_iterator> {
typedef ptrdiff_t difference_type;
typedef count_type value_type;
typedef count_type * pointer;
typedef count_type & reference;
typedef input_iterator_tag iterator_category;
};
}
class profile_t::const_iterator
{
typedef ordered_samples_t::const_iterator iterator_t;
public:
const_iterator() : start_offset(0) {}
const_iterator(iterator_t it_, u64 start_offset_)
: it(it_), start_offset(start_offset_) {}
count_type operator*() const { return it->second; }
const_iterator & operator++() { ++it; return *this; }
odb_key_t vma() const { return it->first + start_offset; }
count_type count() const { return **this; }
bool operator!=(const_iterator const & rhs) const {
return it != rhs.it;
}
bool operator==(const_iterator const & rhs) const {
return it == rhs.it;
}
private:
iterator_t it;
u64 start_offset;
};
#endif /* !PROFILE_H */
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