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Speedup access to unreferenced symbols when loading corpus_group

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This patch speeds up the invocation of
corpus_group::get_unreferenced_function_symbols and
corpus_group::get_unreferenced_variable_symbols.  It does so by
caching the result of constructing the map of of unreferenced symbol
at the time where each corpus is added to the group.

	* src/abg-corpus.cc (corpus_group::unrefed_{fun, var}_symbol_map):
	New data members.
	(corpus_group::priv::priv): Adjust.
	(corpus_group::priv::add_unref_{fun,var}_symbols): Define new
	member functions.
	(corpus_group::add_corpus): Update the map of unreferenced
	symbols.
	(corpus_group::get_unreferenced_{function,variable}_symbols)
	Adjust logic.

Signed-off-by: Dodji Seketeli <dodji@redhat.com>
This commit is contained in:
Dodji Seketeli 2017-04-14 04:51:22 -04:00
parent e09fc8c9e2
commit 5759a92eb4
1 changed files with 100 additions and 39 deletions
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75
src/abg-corpus.cc
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@ -1498,12 +1498,60 @@ struct corpus_group::priv
elf_symbols sorted_fun_symbols;
unordered_map<string, elf_symbol_sptr> unrefed_fun_symbol_map;
elf_symbols unrefed_fun_symbols;
bool unrefed_fun_symbols_built;
unordered_map<string, elf_symbol_sptr> unrefed_var_symbol_map;
elf_symbols unrefed_var_symbols;
bool unrefed_var_symbols_built;
priv()
: unrefed_fun_symbols_built(),
unrefed_var_symbols_built()
{}
}; // end struct::priv
/// Add symbols to the set of corpus group function symbols that are
/// *NOT* referenced by debug info.
///
/// @param syms the set the symbols to add.
void
add_unref_fun_symbols(const elf_symbols& syms)
{
for (elf_symbols::const_iterator e =
syms.begin(); e != syms.end(); ++e)
{
string sym_id = (*e)->get_id_string();
unordered_map<string, elf_symbol_sptr>::const_iterator j =
unrefed_fun_symbol_map.find(sym_id);
if (j != unrefed_fun_symbol_map.end())
continue;
unrefed_fun_symbol_map[sym_id] = *e;
unrefed_fun_symbols.push_back(*e);
}
unrefed_fun_symbols_built = true;
}
/// Add symbols to the set of corpus group variable symbols that are
/// *NOT* referenced by debug info.
///
/// @param syms the set the symbols to add.
void
add_unref_var_symbols(const elf_symbols& syms)
{
for (elf_symbols::const_iterator e =
syms.begin(); e != syms.end(); ++e)
{
string sym_id = (*e)->get_id_string();
unordered_map<string, elf_symbol_sptr>::const_iterator j =
unrefed_var_symbol_map.find(sym_id);
if (j != unrefed_var_symbol_map.end())
continue;
unrefed_var_symbol_map[sym_id] = *e;
unrefed_var_symbols.push_back(*e);
}
unrefed_var_symbols_built = true;
}
}; // end corpus_group::priv
/// Default constructor of the @ref corpus_group type.
corpus_group::corpus_group(environment* env, const string& path = "")
@ -1541,6 +1589,11 @@ corpus_group::add_corpus(const corpus_sptr& corp)
assert(cur_arch == corp_arch);
priv_->corpora.push_back(corp);
/// Add the unreferenced function and variable symbols of this
/// corpus to the unreferenced symbols of the current corpus group.
priv_->add_unref_fun_symbols(get_unreferenced_function_symbols());
priv_->add_unref_var_symbols(get_unreferenced_variable_symbols());
}
/// Getter of the vector of corpora held by the current @ref
@ -1736,9 +1789,9 @@ corpus_group::get_sorted_var_symbols() const
/// Get the set of function symbols not referenced by any debug info,
/// from all the corpora of the current corpus group.
///
/// Upon its first invocation, this function walks all the copora of
/// this corpus group and caches the unreferenced symbols they
/// export. The function then returns the cache.
/// Upon its first invocation, this function possibly walks all the
/// copora of this corpus group and caches the unreferenced symbols
/// they export. The function then returns the cache.
///
/// Upon subsequent invocations, this functions just returns the
/// cached symbols.
@ -1747,7 +1800,9 @@ corpus_group::get_sorted_var_symbols() const
const elf_symbols&
corpus_group::get_unreferenced_function_symbols() const
{
if (!priv_->unrefed_fun_symbols_built)
if (priv_->unrefed_fun_symbols.empty())
{
for (corpora_type::const_iterator i = get_corpora().begin();
i != get_corpora().end();
++i)
@ -1768,6 +1823,8 @@ corpus_group::get_unreferenced_function_symbols() const
priv_->unrefed_fun_symbols.push_back(*e);
}
}
priv_->unrefed_fun_symbols_built = true;
}
return priv_->unrefed_fun_symbols;
}
@ -1775,9 +1832,9 @@ corpus_group::get_unreferenced_function_symbols() const
/// Get the set of variable symbols not referenced by any debug info,
/// from all the corpora of the current corpus group.
///
/// Upon its first invocation, this function walks all the copora of
/// this corpus group and caches the unreferenced symbols they
/// export. The function then returns the cache.
/// Upon its first invocation, this function possibly walks all the
/// copora of this corpus group and caches the unreferenced symbols
/// they export. The function then returns the cache.
///
/// Upon subsequent invocations, this functions just returns the
/// cached symbols.
@ -1786,7 +1843,9 @@ corpus_group::get_unreferenced_function_symbols() const
const elf_symbols&
corpus_group::get_unreferenced_variable_symbols() const
{
if (!priv_->unrefed_var_symbols_built)
if (priv_->unrefed_var_symbols.empty())
{
for (corpora_type::const_iterator i = get_corpora().begin();
i != get_corpora().end();
++i)
@ -1807,6 +1866,8 @@ corpus_group::get_unreferenced_variable_symbols() const
priv_->unrefed_var_symbols.push_back(*e);
}
}
priv_->unrefed_var_symbols_built = true;
}
return priv_->unrefed_var_symbols;
}