[4/4] {dwarf,elf_based}-reader,writer: Avoid duplicating corpora in corpus_group
Commit Message
Hello,
It's been brought to my attention on IRC that running
abidw --linux-tree <kernel-build-tree>
would result in a corpus group that duplicates every single corpus in
the resulting abixml. Oops.
This is because both dwarf::reader::read_corpus() and
elf_based_reader::read_and_add_corpus_to_group() add the corpus to the
corpus_group, and yet, the later function calls the former. So the
corpus is added to the corpus_group twice.
This patch ensures that
elf_based_reader::read_and_add_corpus_to_group() is the only one to
add the corpus to the group. It also ensures that this happens before
the corpus is constructed from the debug info because that is useful
for sharing types among the various corpora. Otherwise, those types
are potentially duplicated in the IR of each corpus.
The patch also ensures that the abixml writer enforces the fact that
each corpus is emitted only once.
* src/abg-dwarf-reader.cc (reader::read_debug_info_into_corpus):
Do not add the corpus to the group here ...
* src/abg-elf-based-reader.cc
(elf_based_reader::read_and_add_corpus_to_group): ... because it's
already added here. But then, let's add it here /before/ reading
type & symbols information into the corpus.
* src/abg-writer.cc (write_context::m_emitted_corpora_set): Add
new data member.
(write_context::{corpus_is_emitted, record_corpus_as_emitted}):
Define new member functions.
(write_corpus): Invoke the new
write_context::record_corpus_as_emitted here.
(write_corpus_group): Ensure that each corpus is emitted only
once.
Signed-off-by: Dodji Seketeli <dodji@redhat.com>
---
src/abg-dwarf-reader.cc | 3 ---
src/abg-elf-based-reader.cc | 4 +---
src/abg-writer.cc | 45 +++++++++++++++++++++++++++++++++++--
3 files changed, 44 insertions(+), 8 deletions(-)
@@ -2121,9 +2121,6 @@ public:
corpus()->set_soname(dt_soname());
corpus()->set_needed(dt_needed());
corpus()->set_architecture_name(elf_architecture());
- if (corpus_group_sptr group = corpus_group())
- group->add_corpus(corpus());
-
// Set symbols information to the corpus.
corpus()->set_symtab(symtab());
@@ -92,10 +92,8 @@ ir::corpus_sptr
elf_based_reader::read_and_add_corpus_to_group(ir::corpus_group& group,
fe_iface::status& status)
{
+ group.add_corpus(corpus());
ir::corpus_sptr corp = read_corpus(status);
-
- if (status & fe_iface::STATUS_OK)
- group.add_corpus(corp);
return corp;
}
@@ -230,7 +230,8 @@ class write_context
class_tmpl_shared_ptr_map m_class_tmpl_id_map;
string_elf_symbol_sptr_map_type m_fun_symbol_map;
string_elf_symbol_sptr_map_type m_var_symbol_map;
- unordered_set<interned_string, hash_interned_string> m_emitted_decls_set;
+ unordered_set<interned_string, hash_interned_string> m_emitted_decls_set;
+ unordered_set<string> m_emitted_corpora_set;
write_context();
@@ -818,6 +819,42 @@ public:
m_emitted_decls_set.insert(irepr);
}
+ /// Test if a corpus has already been emitted.
+ ///
+ /// A corpus is emitted if it's been recorded as having been emitted
+ /// by the function record_corpus_as_emitted().
+ ///
+ /// @param corp the corpus to consider.
+ ///
+ /// @return true iff the corpus @p corp has been emitted.
+ bool
+ corpus_is_emitted(const corpus_sptr& corp)
+ {
+ if (!corp)
+ return false;
+
+ if (m_emitted_corpora_set.find(corp->get_path())
+ == m_emitted_corpora_set.end())
+ return false;
+
+ return true;
+ }
+
+ /// Record the corpus has having been emitted.
+ ///
+ /// @param corp the corpus to consider.
+ void
+ record_corpus_as_emitted(const corpus_sptr& corp)
+ {
+ if (!corp)
+ return;
+
+ const string& path = corp->get_path();
+ ABG_ASSERT(!path.empty());
+
+ m_emitted_corpora_set.insert(path);
+ }
+
/// Get the set of types that have been emitted.
///
/// @return the set of types that have been emitted.
@@ -4588,6 +4625,7 @@ write_corpus(write_context& ctxt,
out << "</abi-corpus>\n";
ctxt.clear_referenced_types();
+ ctxt.record_corpus_as_emitted(corpus);
return true;
}
@@ -4639,7 +4677,10 @@ std::ostream& out = ctxt.get_ostream();
group->get_corpora().begin();
c != group->get_corpora().end();
++c)
- write_corpus(ctxt, *c, get_indent_to_level(ctxt, indent, 1), true);
+ {
+ ABG_ASSERT(!ctxt.corpus_is_emitted(*c));
+ write_corpus(ctxt, *c, get_indent_to_level(ctxt, indent, 1), true);
+ }
do_indent_to_level(ctxt, indent, 0);
out << "</abi-corpus-group>\n";