abg-leaf-reporter.cc

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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// -*- Mode: C++ -*-
//
// Copyright (C) 2017-2023 Red Hat, Inc.
//
// Author: Dodji Seketeli
 
 
/// @file
///
/// This is the implementation of the
/// abigail::comparison::default_reporter type.
 
#include "abg-comparison-priv.h"
#include "abg-reporter.h"
#include "abg-reporter-priv.h"
 
namespace abigail
{
namespace comparison
{
 
/// Test if a diff node is to be reported by the current instance of
/// @ref leaf_reporter.
///
/// A node is said to be reported by the current instance of @ref
/// leaf_reporter if the node carries local changes and if the node's
/// reporting hasn't been suppressed.
bool
leaf_reporter::diff_to_be_reported(const diff *d) const
{return d && d->to_be_reported() && d->has_local_changes();}
 
/// Test if a given instance of @ref corpus_diff carries changes whose
/// reports are not suppressed by any suppression specification.  In
/// effect, these are deemed incompatible ABI changes.
///
/// @param d the @ref corpus_diff to consider
///
/// @return true iff @p d carries subtype changes that are deemed
/// incompatible ABI changes.
bool
leaf_reporter::diff_has_net_changes(const corpus_diff *d) const
{
  if (!d)
    return false;
 
  const corpus_diff::diff_stats& stats = const_cast<corpus_diff*>(d)->
    apply_filters_and_suppressions_before_reporting();
 
  // Logic here should match emit_diff_stats.
  return (d->architecture_changed()
      || d->soname_changed()
      || stats.net_num_func_removed()
      || stats.net_num_leaf_type_changes()
      || stats.net_num_leaf_func_changes()
      || stats.net_num_func_added()
      || stats.net_num_vars_removed()
      || stats.net_num_leaf_var_changes()
      || stats.net_num_vars_added()
      || stats.net_num_removed_unreachable_types()
      || stats.net_num_changed_unreachable_types()
      || stats.net_num_added_unreachable_types()
      || stats.net_num_removed_func_syms()
      || stats.net_num_added_func_syms()
      || stats.net_num_removed_var_syms()
      || stats.net_num_added_var_syms());
}
 
/// Report the changes carried by the diffs contained in an instance
/// of @ref string_diff_ptr_map.
///
/// @param mapp the set of diffs to report for.
///
/// @param out the output stream to report the diffs to.
///
/// @param indent the string to use for indentation.
static void
report_diffs(const reporter_base& r,
         const string_diff_ptr_map& mapp,
         ostream& out,
         const string& indent)
{
  diff_ptrs_type sorted_diffs;
  sort_string_diff_ptr_map(mapp, sorted_diffs);
 
  bool started_to_emit = false;
  for (diff_ptrs_type::const_iterator i = sorted_diffs.begin();
       i != sorted_diffs.end();
       ++i)
    {
      if (const var_diff *d = is_var_diff(*i))
    if (is_data_member(d->first_var()))
      continue;
 
      if (r.diff_to_be_reported((*i)->get_canonical_diff()))
    {
      if (started_to_emit)
        out << "\n";
 
      string n = (*i)->first_subject()->get_pretty_representation();
 
      out << indent << "'" << n;
 
      report_loc_info((*i)->first_subject(),
              *(*i)->context(), out);
 
      out << "' changed:\n";
 
      (*i)->get_canonical_diff()->report(out, indent + "  ");
      started_to_emit = true;
    }
    }
}
 
/// Report the type changes carried by an instance of @ref diff_maps.
///
/// @param maps the set of diffs to report.
///
/// @param out the output stream to report the diffs to.
///
/// @param indent the string to use for indentation.
static void
report_type_changes_from_diff_maps(const leaf_reporter& reporter,
                   const diff_maps& maps,
                   ostream& out,
                   const string& indent)
{
  // basic types
  report_diffs(reporter, maps.get_type_decl_diff_map(), out, indent);
 
  // enums
  report_diffs(reporter, maps.get_enum_diff_map(), out, indent);
 
  // classes
  report_diffs(reporter, maps.get_class_diff_map(), out, indent);
 
  // unions
  report_diffs(reporter, maps.get_union_diff_map(), out, indent);
 
  // typedefs
  report_diffs(reporter, maps.get_typedef_diff_map(), out, indent);
 
  // subranges
  report_diffs(reporter, maps.get_subrange_diff_map(), out, indent);
 
  // arrays
  report_diffs(reporter, maps.get_array_diff_map(), out, indent);
 
  // It doesn't make sense to report function type changes, does it?
  // report_diffs(reporter, maps.get_function_type_diff_map(), out, indent);
 
  // distinct diffs
  report_diffs(reporter, maps.get_distinct_diff_map(), out, indent);
 
  // function parameter diffs
  report_diffs(reporter, maps.get_fn_parm_diff_map(), out, indent);
}
 
/// Report the changes carried by an instance of @ref diff_maps.
///
/// @param maps the set of diffs to report.
///
/// @param out the output stream to report the diffs to.
///
/// @param indent the string to use for indentation.
void
leaf_reporter::report_changes_from_diff_maps(const diff_maps& maps,
                         ostream& out,
                         const string& indent) const
{
  report_type_changes_from_diff_maps(*this, maps, out, indent);
 
  // function decls
  report_diffs(*this, maps.get_function_decl_diff_map(), out, indent);
 
  // var decl
  report_diffs(*this, maps.get_var_decl_diff_map(), out, indent);
}
 
/// Report the changes carried by a @ref typedef_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const typedef_diff& d,
              ostream& out,
              const string& indent) const
{
  if (!diff_to_be_reported(&d))
    return;
 
  // all changes carried by a typedef_diff are considered local, so
  // let's just call the default reporter here.
  default_reporter::report(d, out, indent);
 
  maybe_report_interfaces_impacted_by_diff(&d, out, indent);
}
 
/// Report the changes carried by a @ref qualified_type_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const qualified_type_diff& d, ostream& out,
              const string& indent) const
{
  if (!diff_to_be_reported(&d))
    return;
 
  report_local_qualified_type_changes(d, out, indent);
 
  // Note that changes that are local to the underlying type of a
  // qualified type are considered to be local to the qualified type
  // itself.  So let's go ahead and report the local changes of the
  // underlying type.
  report_underlying_changes_of_qualified_type(d, out, indent);
}
 
/// Report the changes carried by a @ref pointer_diff node.
///
/// Note that this function does nothing because a @ref pointer_diff
/// node never carries local changes.
void
leaf_reporter::report(const pointer_diff &d,
              ostream& out,
              const string& indent) const
{
  // Changes that modify the representation of a pointed-to type is
  // considered local to the pointer type.
  if (!diff_to_be_reported(&d))
    return;
 
  out << indent
      << "pointer type changed from: '"
      << d.first_pointer()->get_pretty_representation()
      << "' to: '"
      << d.second_pointer()->get_pretty_representation()
      << "'\n";
}
 
/// Report the changes carried by a @ref reference_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const reference_diff& d,
              ostream& out,
              const string& indent) const
{
  if (!diff_to_be_reported(&d))
    return;
 
  report_local_reference_type_changes(d, out, indent);
}
 
/// Report the changes carried by a @ref fn_parm_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const fn_parm_diff& d,
              ostream& out,
              const string& indent) const
{
  if (!diff_to_be_reported(&d))
    return;
 
  ABG_ASSERT(diff_to_be_reported(d.type_diff().get()));
 
  function_decl::parameter_sptr f = d.first_parameter();
 
  out << indent
      << "parameter " << f->get_index();
 
  report_loc_info(f, *d.context(), out);
 
  out << " of type '"
      << f->get_type_pretty_representation()
      << "' changed:\n";
  d.type_diff()->report(out, indent + "  ");
}
 
/// Report the changes carried by a @ref function_type_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const function_type_diff& d,
              ostream& out,
              const string& indent) const
{
  if (!diff_to_be_reported(&d))
    return;
 
  report_local_function_type_changes(d, out, indent);
 
  if (diff_to_be_reported(d.priv_->return_type_diff_.get()))
    {
      out << indent << "return type changed:\n";
      d.priv_->return_type_diff_->report(out, indent + "  ");
    }
 
  // Hmmh, the above was quick.  Now report about function parameters;
  //
  // Report about the parameter types that have changed sub-types.
  for (vector<fn_parm_diff_sptr>::const_iterator i =
     d.priv_->sorted_subtype_changed_parms_.begin();
       i != d.priv_->sorted_subtype_changed_parms_.end();
       ++i)
    {
      diff_sptr dif = *i;
      if (diff_to_be_reported(dif.get()))
    dif->report(out, indent);
    }
}
 
/// Report the changes carried by a @ref scope_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const scope_diff& d,
              ostream& out,
              const string& indent) const
{
  if (!d.to_be_reported())
    return;
 
  // Report changed types.
  unsigned num_changed_types = d.changed_types().size();
  if (num_changed_types)
    out << indent << "changed types:\n";
 
  for (diff_sptrs_type::const_iterator dif = d.changed_types().begin();
       dif != d.changed_types().end();
       ++dif)
    {
      if (!*dif || !diff_to_be_reported((*dif).get()))
    continue;
 
      out << indent << "  '"
      << (*dif)->first_subject()->get_pretty_representation()
      << "' changed:\n";
      (*dif)->report(out, indent + "    ");
    }
 
  // Report changed decls
  unsigned num_changed_decls = d.changed_decls().size();
  if (num_changed_decls)
    out << indent << "changed declarations:\n";
 
  for (diff_sptrs_type::const_iterator dif= d.changed_decls().begin();
       dif != d.changed_decls().end ();
       ++dif)
    {
      if (!*dif || !diff_to_be_reported((*dif).get()))
    continue;
 
      out << indent << "  '"
      << (*dif)->first_subject()->get_pretty_representation()
      << "' was changed to '"
      << (*dif)->second_subject()->get_pretty_representation() << "'";
      report_loc_info((*dif)->second_subject(), *d.context(), out);
      out << ":\n";
 
      (*dif)->report(out, indent + "    ");
    }
 
  // Report removed types/decls
  for (string_decl_base_sptr_map::const_iterator i =
     d.priv_->deleted_types_.begin();
       i != d.priv_->deleted_types_.end();
       ++i)
    out << indent
    << "  '"
    << i->second->get_pretty_representation()
    << "' was removed\n";
 
  if (d.priv_->deleted_types_.size())
    out << "\n";
 
  for (string_decl_base_sptr_map::const_iterator i =
     d.priv_->deleted_decls_.begin();
       i != d.priv_->deleted_decls_.end();
       ++i)
    out << indent
    << "  '"
    << i->second->get_pretty_representation()
    << "' was removed\n";
 
  if (d.priv_->deleted_decls_.size())
    out << "\n";
 
  // Report added types/decls
  bool emitted = false;
  for (string_decl_base_sptr_map::const_iterator i =
     d.priv_->inserted_types_.begin();
       i != d.priv_->inserted_types_.end();
       ++i)
    {
      // Do not report about type_decl as these are usually built-in
      // types.
      if (dynamic_pointer_cast<type_decl>(i->second))
    continue;
      out << indent
      << "  '"
      << i->second->get_pretty_representation()
      << "' was added\n";
      emitted = true;
    }
 
  if (emitted)
    out << "\n";
 
  emitted = false;
  for (string_decl_base_sptr_map::const_iterator i =
     d.priv_->inserted_decls_.begin();
       i != d.priv_->inserted_decls_.end();
       ++i)
    {
      // Do not report about type_decl as these are usually built-in
      // types.
      if (dynamic_pointer_cast<type_decl>(i->second))
    continue;
      out << indent
      << "  '"
      << i->second->get_pretty_representation()
      << "' was added\n";
      emitted = true;
    }
 
  if (emitted)
    out << "\n";
}
 
/// Report about the change carried by a @ref subrange_diff diff node
/// in a serialized form.
///
/// @param d the diff node to consider.
///
/// @param out the output stream to report to.
///
/// @param indent the indentation string to use in the report.
void
leaf_reporter::report(const subrange_diff& d, std::ostream& out,
              const std::string& indent) const
{
  if (!diff_to_be_reported(&d))
    return;
 
  RETURN_IF_BEING_REPORTED_OR_WAS_REPORTED_EARLIER3(d.first_subrange(),
                            d.second_subrange(),
                            "range type");
 
  represent(d, d.context(), out,indent, /*local_only=*/true);
 
  maybe_report_interfaces_impacted_by_diff(&d, out, indent);
}
 
/// Report the changes carried by a @ref array_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const array_diff& d,
              ostream& out,
              const string& indent) const
{
  if (!diff_to_be_reported(&d))
    return;
 
  RETURN_IF_BEING_REPORTED_OR_WAS_REPORTED_EARLIER3(d.first_array(),
                            d.second_array(),
                            "array type");
 
  report_name_size_and_alignment_changes(d.first_array(),
                     d.second_array(),
                     d.context(),
                     out, indent);
 
  diff_sptr dif = d.element_type_diff();
  if (diff_to_be_reported(dif.get()))
    {
      string fn = ir::get_pretty_representation(is_type(dif->first_subject()));
      // report array element type changes
      out << indent << "array element type '"
      << fn << "' changed: \n";
      dif->report(out, indent + "  ");
    }
 
  maybe_report_interfaces_impacted_by_diff(&d, out, indent);
}
 
/// Report the changes carried by a @ref class_or_union_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const class_or_union_diff& d,
              ostream& out,
              const string& indent) const
{
  if (!diff_to_be_reported(&d))
    return;
 
  class_or_union_sptr first = d.first_class_or_union(),
    second = d.second_class_or_union();
 
  const diff_context_sptr& ctxt = d.context();
 
  // Report class decl-only -> definition change.
  if (ctxt->get_allowed_category() & TYPE_DECL_ONLY_DEF_CHANGE_CATEGORY)
    if (filtering::has_class_decl_only_def_change(first, second))
      {
    string was =
      first->get_is_declaration_only()
      ? " was a declaration-only type"
      : " was a defined type";
 
    string is_now =
      second->get_is_declaration_only()
      ? " and is now a declaration-only type"
      : " and is now a defined type";
 
    out << indent << "type " << first->get_pretty_representation()
        << was << is_now << "\n";
    return;
      }
 
  // member functions
  if (d.member_fns_changes())
    {
      // report deletions
      int numdels = d.get_priv()->deleted_member_functions_.size();
      size_t num_filtered =
    d.get_priv()->count_filtered_deleted_mem_fns(ctxt);
      if (numdels)
    report_mem_header(out, numdels, num_filtered, del_kind,
              "member function", indent);
      for (string_member_function_sptr_map::const_iterator i =
         d.get_priv()->deleted_member_functions_.begin();
       i != d.get_priv()->deleted_member_functions_.end();
       ++i)
    {
      if (!(ctxt->get_allowed_category()
        & NON_VIRT_MEM_FUN_CHANGE_CATEGORY)
          && !get_member_function_is_virtual(i->second))
        continue;
 
      method_decl_sptr mem_fun = i->second;
      out << indent << "  ";
      represent(*ctxt, mem_fun, out);
    }
 
      // report insertions;
      int numins = d.get_priv()->inserted_member_functions_.size();
      num_filtered = d.get_priv()->count_filtered_inserted_mem_fns(ctxt);
      if (numins)
    report_mem_header(out, numins, num_filtered, ins_kind,
              "member function", indent);
      for (string_member_function_sptr_map::const_iterator i =
         d.get_priv()->inserted_member_functions_.begin();
       i != d.get_priv()->inserted_member_functions_.end();
       ++i)
    {
      if (!(ctxt->get_allowed_category()
        & NON_VIRT_MEM_FUN_CHANGE_CATEGORY)
          && !get_member_function_is_virtual(i->second))
        continue;
 
      method_decl_sptr mem_fun = i->second;
      out << indent << "  ";
      represent(*ctxt, mem_fun, out);
    }
 
      // report member function with sub-types changes
      int numchanges = d.get_priv()->sorted_changed_member_functions_.size();
      if (numchanges)
    report_mem_header(out, change_kind, "member function", indent);
      for (function_decl_diff_sptrs_type::const_iterator i =
         d.get_priv()->sorted_changed_member_functions_.begin();
       i != d.get_priv()->sorted_changed_member_functions_.end();
       ++i)
    {
      if (!(ctxt->get_allowed_category()
        & NON_VIRT_MEM_FUN_CHANGE_CATEGORY)
          && !(get_member_function_is_virtual
           ((*i)->first_function_decl()))
          && !(get_member_function_is_virtual
           ((*i)->second_function_decl())))
        continue;
 
      diff_sptr diff = *i;
      if (!diff_to_be_reported(diff.get()))
        continue;
 
      string repr =
        (*i)->first_function_decl()->get_pretty_representation();
      out << indent << "  '" << repr << "' has some changes:\n";
      diff->report(out, indent + "    ");
    }
    }
 
  // data members
  if (d.data_members_changes())
    {
      // report deletions
      int numdels = d.class_or_union_diff::get_priv()->
    get_deleted_non_static_data_members_number();
      if (numdels)
    {
      report_mem_header(out, numdels, 0, del_kind,
                "data member", indent);
      vector<decl_base_sptr> sorted_dms;
      sort_data_members
        (d.class_or_union_diff::get_priv()->deleted_data_members_,
         sorted_dms);
      for (vector<decl_base_sptr>::const_iterator i = sorted_dms.begin();
           i != sorted_dms.end();
           ++i)
        {
          var_decl_sptr data_mem =
        dynamic_pointer_cast<var_decl>(*i);
          ABG_ASSERT(data_mem);
          if (get_member_is_static(data_mem))
        continue;
          represent_data_member(data_mem, ctxt, out, indent + "  ");
        }
    }
 
      //report insertions
      int numins =
    d.class_or_union_diff::get_priv()->inserted_data_members_.size();
      if (numins)
    {
      report_mem_header(out, numins, 0, ins_kind,
                "data member", indent);
      vector<decl_base_sptr> sorted_dms;
      sort_data_members
        (d.class_or_union_diff::get_priv()->inserted_data_members_,
         sorted_dms);
      for (vector<decl_base_sptr>::const_iterator i = sorted_dms.begin();
           i != sorted_dms.end();
           ++i)
        {
          var_decl_sptr data_mem =
        dynamic_pointer_cast<var_decl>(*i);
          ABG_ASSERT(data_mem);
          represent_data_member(data_mem, ctxt, out, indent + "  ");
        }
    }
 
      // report changes
      size_t numchanges = (d.sorted_changed_data_members().size()
               + d.sorted_subtype_changed_data_members().size());
 
      size_t num_filtered =
    (d.count_filtered_changed_data_members(/*local_only=*/true)
     + d.count_filtered_subtype_changed_data_members(/*local_only=*/true));
 
      ABG_ASSERT(numchanges >= num_filtered);
      size_t net_numchanges = numchanges - num_filtered;
 
      if (net_numchanges)
    {
      report_mem_header(out, change_kind, "data member", indent);
 
      for (var_diff_sptrs_type::const_iterator it =
         d.sorted_changed_data_members().begin();
           it != d.sorted_changed_data_members().end();
           ++it)
        if (diff_to_be_reported((*it).get()))
          represent(*it, ctxt, out, indent + "  ", /*local_only=*/true);
 
      for (var_diff_sptrs_type::const_iterator it =
         d.sorted_subtype_changed_data_members().begin();
           it != d.sorted_subtype_changed_data_members().end();
           ++it)
        if (diff_to_be_reported((*it).get()))
          represent(*it, ctxt, out, indent + "  ", /*local_only=*/true);
    }
 
      // Report about data members replaced by an anonymous union data
      // member.
      maybe_report_data_members_replaced_by_anon_dm(d, out, indent);
    }
}
 
/// Report the changes carried by a @ref class_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const class_diff& d,
              ostream& out,
              const string& indent) const
{
  if (!diff_to_be_reported(&d))
    return;
 
  RETURN_IF_BEING_REPORTED_OR_WAS_REPORTED_EARLIER(d.first_subject(),
                           d.second_subject());
 
  string name = d.first_subject()->get_pretty_representation();
 
  // Now report the changes about the differents parts of the type.
  class_decl_sptr first = d.first_class_decl(),
    second = d.second_class_decl();
 
  report_name_size_and_alignment_changes(first, second, d.context(),
                     out, indent);
 
  const diff_context_sptr& ctxt = d.context();
  maybe_report_diff_for_member(first, second, ctxt, out, indent);
 
  d.class_or_union_diff::report(out, indent);
 
  maybe_report_base_class_reordering(d, out, indent);
 
  maybe_report_interfaces_impacted_by_diff(&d, out, indent);
 
  d.reported_once(true);
}
 
/// Report the changes carried by a @ref union_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const union_diff& d,
              ostream& out,
              const string& indent) const
{
  if (!diff_to_be_reported(&d))
    return;
 
  RETURN_IF_BEING_REPORTED_OR_WAS_REPORTED_EARLIER(d.first_subject(),
                           d.second_subject());
 
  // Now report the changes about the differents parts of the type.
  union_decl_sptr first = d.first_union_decl(), second = d.second_union_decl();
 
  report_name_size_and_alignment_changes(first, second, d.context(),
                     out, indent);
 
  maybe_report_diff_for_member(first, second,d. context(), out, indent);
 
  d.class_or_union_diff::report(out, indent);
 
  maybe_report_interfaces_impacted_by_diff(&d, out, indent);
}
 
/// Report the changes carried by a @ref distinct_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const distinct_diff& d,
              ostream& out,
              const string& indent) const
{
    if (!diff_to_be_reported(&d))
    return;
 
  type_or_decl_base_sptr f = d.first(), s = d.second();
 
  string f_repr = f ? f->get_pretty_representation() : "'void'";
  string s_repr = s ? s->get_pretty_representation() : "'void'";
 
  diff_sptr diff = d.compatible_child_diff();
 
  string compatible = diff ? " to compatible type '": " to '";
 
  out << indent << "entity changed from '" << f_repr << "'"
      << compatible << s_repr << "'";
  report_loc_info(s, *d.context(), out);
  out << "\n";
 
  report_size_and_alignment_changes(f, s, d.context(), out, indent);
  maybe_report_interfaces_impacted_by_diff(&d, out, indent);
}
 
/// Report the changes carried by a @ref function_decl_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const function_decl_diff& d,
              ostream& out,
              const string& indent) const
{
  if (!diff_to_be_reported(&d))
    return;
 
  maybe_report_diff_for_member(d.first_function_decl(),
                   d.second_function_decl(),
                   d.context(), out, indent);
 
  function_decl_sptr ff = d.first_function_decl();
  function_decl_sptr sf = d.second_function_decl();
 
  diff_context_sptr ctxt = d.context();
  corpus_sptr fc = ctxt->get_corpus_diff()->first_corpus();
  corpus_sptr sc = ctxt->get_corpus_diff()->second_corpus();
 
  string qn1 = ff->get_qualified_name(), qn2 = sf->get_qualified_name(),
    linkage_names1, linkage_names2;
  elf_symbol_sptr s1 = ff->get_symbol(), s2 = sf->get_symbol();
 
  if (s1)
    linkage_names1 = s1->get_id_string();
  if (s2)
    linkage_names2 = s2->get_id_string();
 
  // If the symbols for ff and sf have aliases, get all the names of
  // the aliases;
  if (fc && s1)
    linkage_names1 =
      s1->get_aliases_id_string(fc->get_fun_symbol_map());
  if (sc && s2)
    linkage_names2 =
      s2->get_aliases_id_string(sc->get_fun_symbol_map());
 
  /// If the set of linkage names of the function have changed, report
  /// it.
  if (linkage_names1 != linkage_names2)
    {
      if (linkage_names1.empty())
    {
      out << indent << ff->get_pretty_representation()
          << " didn't have any linkage name, and it now has: '"
          << linkage_names2 << "'\n";
    }
      else if (linkage_names2.empty())
    {
      out << indent << ff->get_pretty_representation()
          << " did have linkage names '" << linkage_names1
          << "'\n"
          << indent << "but it doesn't have any linkage name anymore\n";
    }
      else
    out << indent << "linkage names of "
        << ff->get_pretty_representation()
        << "\n" << indent << "changed from '"
        << linkage_names1 << "' to '" << linkage_names2 << "'\n";
    }
 
  if (qn1 != qn2
      && diff_to_be_reported(d.type_diff().get()))
    {
      // So the function has sub-type changes that are to be
      // reported.  Let's see if the function name changed too; if it
      // did, then we'd report that change right before reporting the
      // sub-type changes.
      string frep1 = d.first_function_decl()->get_pretty_representation(),
    frep2 = d.second_function_decl()->get_pretty_representation();
      out << indent << "'" << frep1 << " {" << linkage_names1<< "}"
      << "' now becomes '"
      << frep2 << " {" << linkage_names2 << "}" << "'\n";
    }
 
  maybe_report_diff_for_symbol(ff->get_symbol(),
                   sf->get_symbol(),
                   ctxt, out, indent);
 
  // Now report about inline-ness changes
  if (ff->is_declared_inline() != sf->is_declared_inline())
    {
      out << indent;
      if (ff->is_declared_inline())
    out << sf->get_pretty_representation()
        << " is not declared inline anymore\n";
      else
    out << sf->get_pretty_representation()
        << " is now declared inline\n";
    }
 
  // Report about vtable offset changes.
  if (is_member_function(ff) && is_member_function(sf))
    {
      bool ff_is_virtual = get_member_function_is_virtual(ff),
    sf_is_virtual = get_member_function_is_virtual(sf);
      if (ff_is_virtual != sf_is_virtual)
    {
      out << indent;
      if (ff_is_virtual)
        out << ff->get_pretty_representation()
        << " is no more declared virtual\n";
      else
        out << ff->get_pretty_representation()
        << " is now declared virtual\n";
    }
 
      size_t ff_vtable_offset = get_member_function_vtable_offset(ff),
    sf_vtable_offset = get_member_function_vtable_offset(sf);
      if (ff_is_virtual && sf_is_virtual
      && (ff_vtable_offset != sf_vtable_offset))
    {
      out << indent
          << "the vtable offset of "  << ff->get_pretty_representation()
          << " changed from " << ff_vtable_offset
          << " to " << sf_vtable_offset << "\n";
    }
 
      // the classes of the two member functions.
      class_decl_sptr fc =
    is_class_type(is_method_type(ff->get_type())->get_class_type());
      class_decl_sptr sc =
    is_class_type(is_method_type(sf->get_type())->get_class_type());
 
      // Detect if the virtual member function changes above
      // introduced a vtable change or not.
      bool vtable_added = false, vtable_removed = false;
      if (!fc->get_is_declaration_only() && !sc->get_is_declaration_only())
    {
      vtable_added = !fc->has_vtable() && sc->has_vtable();
      vtable_removed = fc->has_vtable() && !sc->has_vtable();
    }
      bool vtable_changed = ((ff_is_virtual != sf_is_virtual)
                 || (ff_vtable_offset != sf_vtable_offset));
      bool incompatible_change = (ff_vtable_offset != sf_vtable_offset);
 
      if (vtable_added)
    out << indent
        << "  note that a vtable was added to "
        << fc->get_pretty_representation()
        << "\n";
      else if (vtable_removed)
    out << indent
        << "  note that the vtable was removed from "
        << fc->get_pretty_representation()
        << "\n";
      else if (vtable_changed)
    {
      out << indent;
      if (incompatible_change)
        out << "  note that this is an ABI incompatible "
          "change to the vtable of ";
      else
        out << "  note that this induces a change to the vtable of ";
      out << fc->get_pretty_representation()
          << "\n";
    }
 
    }
 
  // Report about function type differences.
  if (diff_to_be_reported(d.type_diff().get()))
    d.type_diff()->report(out, indent);
}
 
/// Report the changes carried by a @ref var_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const var_diff& d,
              ostream& out,
              const string& indent) const
{
  if (!diff_to_be_reported(&d))
    return;
 
  decl_base_sptr first = d.first_var(), second = d.second_var();
  string n = first->get_pretty_representation();
 
  report_name_size_and_alignment_changes(first, second,
                     d.context(),
                     out, indent);
 
  maybe_report_diff_for_symbol(d.first_var()->get_symbol(),
                   d.second_var()->get_symbol(),
                   d.context(), out, indent);
 
  maybe_report_diff_for_member(first, second, d.context(), out, indent);
 
  if (diff_sptr dif = d.type_diff())
    {
      if (diff_to_be_reported(dif.get()))
    {
      RETURN_IF_BEING_REPORTED_OR_WAS_REPORTED_EARLIER2(dif, "type");
      out << indent << "type of variable changed:\n";
      dif->report(out, indent + "  ");
    }
    }
}
 
/// Report the changes carried by a @ref translation_unit_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const translation_unit_diff& d,
              ostream& out,
              const string& indent) const
{
  if (!d.to_be_reported())
    return;
 
  static_cast<const scope_diff&>(d).report(out, indent);
}
 
/// Report the changes carried by a @ref corpus_diff node.
///
/// @param out the output stream to report to.
///
/// @param indent the white space string to use for indentation.
void
leaf_reporter::report(const corpus_diff& d,
              ostream& out,
              const string& indent) const
{
  if (!d.has_changes())
    return;
 
  const corpus_diff::diff_stats &s =
    const_cast<corpus_diff&>(d).
    apply_filters_and_suppressions_before_reporting();
 
  const diff_context_sptr& ctxt = d.context();
 
  d.priv_->emit_diff_stats(s, out, indent);
  if (ctxt->show_stats_only())
    return;
  out << "\n";
 
  if (ctxt->show_soname_change()
      && !d.priv_->sonames_equal_)
    out << indent << "SONAME changed from '"
    << d.first_corpus()->get_soname() << "' to '"
    << d.second_corpus()->get_soname() << "'\n\n";
 
  if (ctxt->show_architecture_change()
      && !d.priv_->architectures_equal_)
    out << indent << "architecture changed from '"
    << d.first_corpus()->get_architecture_name() << "' to '"
    << d.second_corpus()->get_architecture_name() << "'\n\n";
 
  /// Report removed/added/changed functions.
  if (ctxt->show_deleted_fns())
    {
      if (s.net_num_func_removed() == 1)
    out << indent << "1 Removed function:\n\n";
      else if (s.net_num_func_removed() > 1)
    out << indent << s.net_num_func_removed() << " Removed functions:\n\n";
 
      bool emitted = false;
      vector<function_decl*>sorted_deleted_fns;
      sort_string_function_ptr_map(d.priv_->deleted_fns_, sorted_deleted_fns);
      for (vector<function_decl*>::const_iterator i =
         sorted_deleted_fns.begin();
       i != sorted_deleted_fns.end();
       ++i)
    {
      if (d.priv_->deleted_function_is_suppressed(*i))
        continue;
 
      out << indent
          << "  ";
      out << "[D] ";
      out << "'" << (*i)->get_pretty_representation() << "'";
      if (ctxt->show_linkage_names())
        {
          out << "    {";
          show_linkage_name_and_aliases(out, "", *(*i)->get_symbol(),
                        d.first_corpus()->get_fun_symbol_map());
          out << "}";
        }
      out << "\n";
      if (is_member_function(*i) && get_member_function_is_virtual(*i))
        {
          class_decl_sptr c =
        is_class_type(is_method_type((*i)->get_type())->get_class_type());
          out << indent
          << "    "
          << "note that this removes an entry from the vtable of "
          << c->get_pretty_representation()
          << "\n";
        }
      emitted = true;
    }
      if (emitted)
    out << "\n";
    }
 
  if (ctxt->show_added_fns())
    {
      if (s.net_num_func_added() == 1)
    out << indent << "1 Added function:\n\n";
      else if (s.net_num_func_added() > 1)
    out << indent << s.net_num_func_added()
        << " Added functions:\n\n";
      bool emitted = false;
      vector<function_decl*> sorted_added_fns;
      sort_string_function_ptr_map(d.priv_->added_fns_, sorted_added_fns);
      for (vector<function_decl*>::const_iterator i = sorted_added_fns.begin();
       i != sorted_added_fns.end();
       ++i)
    {
      if (d.priv_->added_function_is_suppressed(*i))
        continue;
 
      out
        << indent
        << "  ";
      out << "[A] ";
      out << "'"
          << (*i)->get_pretty_representation()
          << "'";
      if (ctxt->show_linkage_names())
        {
          out << "    {";
          show_linkage_name_and_aliases
        (out, "", *(*i)->get_symbol(),
         d.second_corpus()->get_fun_symbol_map());
          out << "}";
        }
      out << "\n";
      if (is_member_function(*i) && get_member_function_is_virtual(*i))
        {
          class_decl_sptr c =
        is_class_type(is_method_type((*i)->get_type())->get_class_type());
          out << indent
          << "    "
          << "note that this adds a new entry to the vtable of "
          << c->get_pretty_representation()
          << "\n";
        }
      emitted = true;
    }
      if (emitted)
    out << "\n";
    }
 
  if (ctxt->show_changed_fns())
    {
      // Show changed functions.
      size_t num_changed = s.net_num_leaf_func_changes();
      if (num_changed == 1)
    out << indent << "1 function with some sub-type change:\n\n";
      else if (num_changed > 1)
    out << indent << num_changed
        << " functions with some sub-type change:\n\n";
 
      vector<function_decl_diff_sptr> sorted_changed_fns;
      sort_string_function_decl_diff_sptr_map(d.priv_->changed_fns_map_,
                          sorted_changed_fns);
      for (vector<function_decl_diff_sptr>::const_iterator i =
         sorted_changed_fns.begin();
       i != sorted_changed_fns.end();
       ++i)
    {
      diff_sptr diff = *i;
      if (!diff)
        continue;
 
      if (diff_to_be_reported(diff.get()))
        {
          function_decl_sptr fn = (*i)->first_function_decl();
          out << indent << "  [C] '"
          << fn->get_pretty_representation() << "'";
          report_loc_info((*i)->second_function_decl(), *ctxt, out);
          out << " has some sub-type changes:\n";
          if ((fn->get_symbol()->has_aliases()
           && !(is_member_function(fn)
            && get_member_function_is_ctor(fn))
           && !(is_member_function(fn)
            && get_member_function_is_dtor(fn)))
          || (is_c_language(get_translation_unit(fn)->get_language())
              && fn->get_name() != fn->get_linkage_name()))
        {
          int number_of_aliases =
            fn->get_symbol()->get_number_of_aliases();
          if (number_of_aliases == 0)
            {
              out << indent << "    "
              << "Please note that the exported symbol of "
            "this function is "
              << fn->get_symbol()->get_id_string()
              << "\n";
            }
          else
            {
              out << indent << "    "
              << "Please note that the symbol of this function is "
              << fn->get_symbol()->get_id_string()
              << "\n     and it aliases symbol";
              if (number_of_aliases > 1)
            out << "s";
              out << ": "
              << fn->get_symbol()->get_aliases_id_string(false)
              << "\n";
            }
        }
          diff->report(out, indent + "    ");
          // Extra spacing.
          out << "\n";
        }
    }
      // Changed functions have extra spacing already. No new line here.
    }
 
  // Report removed/added/changed variables.
  if (ctxt->show_deleted_vars())
    {
      if (s.net_num_vars_removed() == 1)
    out << indent << "1 Removed variable:\n\n";
      else if (s.net_num_vars_removed() > 1)
    out << indent << s.net_num_vars_removed()
        << " Removed variables:\n\n";
      string n;
      bool emitted = false;
      vector<var_decl*> sorted_deleted_vars;
      sort_string_var_ptr_map(d.priv_->deleted_vars_, sorted_deleted_vars);
      for (vector<var_decl*>::const_iterator i =
         sorted_deleted_vars.begin();
       i != sorted_deleted_vars.end();
       ++i)
    {
      if (d.priv_->deleted_variable_is_suppressed(*i))
        continue;
 
      n = (*i)->get_pretty_representation();
 
      out << indent
          << "  ";
      out << "[D] ";
      out << "'"
          << n
          << "'";
      if (ctxt->show_linkage_names())
        {
          out << "    {";
          show_linkage_name_and_aliases(out, "", *(*i)->get_symbol(),
                        d.first_corpus()->get_var_symbol_map());
          out << "}";
        }
      out << "\n";
      emitted = true;
    }
      if (emitted)
    out << "\n";
    }
 
  if (ctxt->show_added_vars())
    {
      if (s.net_num_vars_added() == 1)
    out << indent << "1 Added variable:\n\n";
      else if (s.net_num_vars_added() > 1)
    out << indent << s.net_num_vars_added()
        << " Added variables:\n\n";
      string n;
      bool emitted = false;
      vector<var_decl*> sorted_added_vars;
      sort_string_var_ptr_map(d.priv_->added_vars_, sorted_added_vars);
      for (vector<var_decl*>::const_iterator i =
         sorted_added_vars.begin();
       i != sorted_added_vars.end();
       ++i)
    {
      if (d.priv_->added_variable_is_suppressed(*i))
        continue;
 
      n = (*i)->get_pretty_representation();
 
      out << indent
          << "  ";
      out << "[A] ";
      out << "'" << n << "'";
      if (ctxt->show_linkage_names())
        {
          out << "    {";
          show_linkage_name_and_aliases(out, "", *(*i)->get_symbol(),
                        d.second_corpus()->get_var_symbol_map());
          out << "}";
        }
      out << "\n";
      emitted = true;
    }
      if (emitted)
    out << "\n";
    }
 
  if (ctxt->show_changed_vars())
    {
      size_t num_changed = s.net_num_leaf_var_changes();
      if (num_changed == 1)
    out << indent << "1 Changed variable:\n\n";
      else if (num_changed > 1)
    out << indent << num_changed
        << " Changed variables:\n\n";
      string n1, n2;
      for (var_diff_sptrs_type::const_iterator i =
         d.priv_->sorted_changed_vars_.begin();
       i != d.priv_->sorted_changed_vars_.end();
       ++i)
    {
      diff_sptr diff = *i;
 
      if (!diff)
        continue;
 
      if (!diff_to_be_reported(diff.get()))
        continue;
 
      n1 = diff->first_subject()->get_pretty_representation();
      n2 = diff->second_subject()->get_pretty_representation();
 
      out << indent << "  [C] '" << n1 << "' was changed";
      if (n1 != n2)
        out << " to '" << n2 << "'";
      report_loc_info(diff->second_subject(), *ctxt, out);
      out << ":\n";
      diff->report(out, indent + "    ");
      // Extra spacing.
      out << "\n";
    }
      // Changed variables have extra spacing already. No new line here.
    }
 
  // Report removed function symbols not referenced by any debug info.
  if (ctxt->show_symbols_unreferenced_by_debug_info()
      && d.priv_->deleted_unrefed_fn_syms_.size())
    {
      if (s.net_num_removed_func_syms() == 1)
    out << indent
        << "1 Removed function symbol not referenced by debug info:\n\n";
      else if (s.net_num_removed_func_syms() > 0)
    out << indent
        << s.net_num_removed_func_syms()
        << " Removed function symbols not referenced by debug info:\n\n";
 
      bool emitted = false;
      vector<elf_symbol_sptr> sorted_deleted_unrefed_fn_syms;
      sort_string_elf_symbol_map(d.priv_->deleted_unrefed_fn_syms_,
                 sorted_deleted_unrefed_fn_syms);
      for (vector<elf_symbol_sptr>::const_iterator i =
         sorted_deleted_unrefed_fn_syms.begin();
       i != sorted_deleted_unrefed_fn_syms.end();
       ++i)
    {
      if (d.priv_->deleted_unrefed_fn_sym_is_suppressed((*i).get()))
        continue;
 
      out << indent << "  ";
      out << "[D] ";
 
      show_linkage_name_and_aliases(out, "", **i,
                    d.first_corpus()->get_fun_symbol_map());
      out << "\n";
      emitted = true;
    }
      if (emitted)
    out << "\n";
    }
 
  // Report added function symbols not referenced by any debug info.
  if (ctxt->show_symbols_unreferenced_by_debug_info()
      && ctxt->show_added_symbols_unreferenced_by_debug_info()
      && d.priv_->added_unrefed_fn_syms_.size())
    {
      if (s.net_num_added_func_syms() == 1)
    out << indent
        << "1 Added function symbol not referenced by debug info:\n\n";
      else if (s.net_num_added_func_syms() > 0)
    out << indent
        << s.net_num_added_func_syms()
        << " Added function symbols not referenced by debug info:\n\n";
 
      bool emitted = false;
      vector<elf_symbol_sptr> sorted_added_unrefed_fn_syms;
      sort_string_elf_symbol_map(d.priv_->added_unrefed_fn_syms_,
                 sorted_added_unrefed_fn_syms);
      for (vector<elf_symbol_sptr>::const_iterator i =
         sorted_added_unrefed_fn_syms.begin();
       i != sorted_added_unrefed_fn_syms.end();
       ++i)
    {
      if (d.priv_->added_unrefed_fn_sym_is_suppressed((*i).get()))
        continue;
 
      out << indent << "  ";
      out << "[A] ";
      show_linkage_name_and_aliases(out, "",
                    **i,
                    d.second_corpus()->get_fun_symbol_map());
      out << "\n";
      emitted = true;
    }
      if (emitted)
    out << "\n";
    }
 
  // Report removed variable symbols not referenced by any debug info.
  if (ctxt->show_symbols_unreferenced_by_debug_info()
      && d.priv_->deleted_unrefed_var_syms_.size())
    {
      if (s.net_num_removed_var_syms() == 1)
    out << indent
        << "1 Removed variable symbol not referenced by debug info:\n\n";
      else if (s.net_num_removed_var_syms() > 0)
    out << indent
        << s.net_num_removed_var_syms()
        << " Removed variable symbols not referenced by debug info:\n\n";
 
      bool emitted = false;
      vector<elf_symbol_sptr> sorted_deleted_unrefed_var_syms;
      sort_string_elf_symbol_map(d.priv_->deleted_unrefed_var_syms_,
                 sorted_deleted_unrefed_var_syms);
      for (vector<elf_symbol_sptr>::const_iterator i =
         sorted_deleted_unrefed_var_syms.begin();
       i != sorted_deleted_unrefed_var_syms.end();
       ++i)
    {
      if (d.priv_->deleted_unrefed_var_sym_is_suppressed((*i).get()))
        continue;
 
      out << indent << "  ";
      out << "[D] ";
 
      show_linkage_name_and_aliases
        (out, "", **i,
         d.first_corpus()->get_fun_symbol_map());
 
      out << "\n";
      emitted = true;
    }
      if (emitted)
    out << "\n";
    }
 
  // Report added variable symbols not referenced by any debug info.
  if (ctxt->show_symbols_unreferenced_by_debug_info()
      && ctxt->show_added_symbols_unreferenced_by_debug_info()
      && d.priv_->added_unrefed_var_syms_.size())
    {
      if (s.net_num_added_var_syms() == 1)
    out << indent
        << "1 Added variable symbol not referenced by debug info:\n\n";
      else if (s.net_num_added_var_syms() > 0)
    out << indent
        << s.net_num_added_var_syms()
        << " Added variable symbols not referenced by debug info:\n\n";
 
      bool emitted = false;
      vector<elf_symbol_sptr> sorted_added_unrefed_var_syms;
      sort_string_elf_symbol_map(d.priv_->added_unrefed_var_syms_,
                 sorted_added_unrefed_var_syms);
      for (vector<elf_symbol_sptr>::const_iterator i =
         sorted_added_unrefed_var_syms.begin();
       i != sorted_added_unrefed_var_syms.end();
       ++i)
    {
      if (d.priv_->added_unrefed_var_sym_is_suppressed((*i).get()))
        continue;
 
      out << indent << "  ";
      out << "[A] ";
      show_linkage_name_and_aliases(out, "", **i,
                    d.second_corpus()->get_fun_symbol_map());
      out << "\n";
      emitted = true;
    }
      if (emitted)
    out << "\n";
    }
 
  // Now show the changed types.
  const diff_maps& leaf_diffs = d.get_leaf_diffs();
  report_type_changes_from_diff_maps(*this, leaf_diffs, out, indent);
 
  // Report added/removed/changed types not reacheable from public
  // interfaces.
  maybe_report_unreachable_type_changes(d, s, indent, out);
 
  d.priv_->maybe_dump_diff_tree();
}
} // end namespace comparison
} // end namespace abigail