I took another look at this patch and have split it into two, one (this
one) to standardise the error messages used and prepare
'module_may_redeclare' for use with temploid friends, and another
followup patch to actually handle them correctly.
Bootstrapped and regtested on x86_64-pc-linux-gnu, OK for trunk?
-- >8 --
Currently different places calling 'module_may_redeclare' all emit very
similar but slightly different error messages, and handle different
kinds of declarations differently. This patch makes the function
perform its own error messages so that they're all in one place, and
prepares it for use with temploid friends (PR c++/114275).
gcc/cp/ChangeLog:
* cp-tree.h (module_may_redeclare): Add default parameter.
* decl.cc (duplicate_decls): Don't emit errors for failed
module_may_redeclare.
(xref_tag): Likewise.
(start_enum): Likewise.
* semantics.cc (begin_class_definition): Likewise.
* module.cc (module_may_redeclare): Clean up logic. Emit error
messages on failure.
gcc/testsuite/ChangeLog:
* g++.dg/modules/enum-12.C: Update error message.
* g++.dg/modules/friend-5_b.C: Likewise.
* g++.dg/modules/shadow-1_b.C: Likewise.
Signed-off-by: Nathaniel Shead <nathanielosh...@gmail.com>
---
gcc/cp/cp-tree.h | 2 +-
gcc/cp/decl.cc | 28 +----
gcc/cp/module.cc | 120 ++++++++++++++--------
gcc/cp/semantics.cc | 6 +-
gcc/testsuite/g++.dg/modules/enum-12.C | 2 +-
gcc/testsuite/g++.dg/modules/friend-5_b.C | 2 +-
gcc/testsuite/g++.dg/modules/shadow-1_b.C | 5 +-
7 files changed, 89 insertions(+), 76 deletions(-)
diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h
index 1dbb577a38d..faa7a0052a5 100644
--- a/gcc/cp/cp-tree.h
+++ b/gcc/cp/cp-tree.h
@@ -7401,7 +7401,7 @@ inline bool module_exporting_p ()
extern module_state *get_module (tree name, module_state *parent = NULL,
bool partition = false);
-extern bool module_may_redeclare (tree decl);
+extern bool module_may_redeclare (tree olddecl, tree newdecl = NULL);
extern bool module_global_init_needed ();
extern bool module_determine_import_inits ();
diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc
index 65ab64885ff..aa66da4829d 100644
--- a/gcc/cp/decl.cc
+++ b/gcc/cp/decl.cc
@@ -2279,18 +2279,8 @@ duplicate_decls (tree newdecl, tree olddecl, bool
hiding, bool was_hidden)
&& TREE_CODE (olddecl) != NAMESPACE_DECL
&& !hiding)
{
- if (!module_may_redeclare (olddecl))
- {
- if (DECL_ARTIFICIAL (olddecl))
- error ("declaration %qD conflicts with builtin", newdecl);
- else
- {
- error ("declaration %qD conflicts with import", newdecl);
- inform (olddecl_loc, "import declared %q#D here", olddecl);
- }
-
- return error_mark_node;
- }
+ if (!module_may_redeclare (olddecl, newdecl))
+ return error_mark_node;
tree not_tmpl = STRIP_TEMPLATE (olddecl);
if (DECL_LANG_SPECIFIC (not_tmpl)
@@ -16620,12 +16610,7 @@ xref_tag (enum tag_types tag_code, tree name,
{
tree decl = TYPE_NAME (t);
if (!module_may_redeclare (decl))
- {
- auto_diagnostic_group d;
- error ("cannot declare %qD in a different module", decl);
- inform (DECL_SOURCE_LOCATION (decl), "previously declared here");
- return error_mark_node;
- }
+ return error_mark_node;
tree not_tmpl = STRIP_TEMPLATE (decl);
if (DECL_LANG_SPECIFIC (not_tmpl)
@@ -16973,12 +16958,7 @@ start_enum (tree name, tree enumtype, tree
underlying_type,
{
tree decl = TYPE_NAME (enumtype);
if (!module_may_redeclare (decl))
- {
- auto_diagnostic_group d;
- error ("cannot declare %qD in different module", decl);
- inform (DECL_SOURCE_LOCATION (decl), "previously declared here");
- enumtype = error_mark_node;
- }
+ enumtype = error_mark_node;
else
set_instantiating_module (decl);
}
diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index 001430a4a8f..e2d2910ae48 100644
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -18992,11 +18992,15 @@ get_importing_module (tree decl, bool flexible)
return module->mod;
}
-/* Is it permissible to redeclare DECL. */
+/* Is it permissible to redeclare OLDDECL with NEWDECL.
+
+ If NEWDECL is NULL, assumes that OLDDECL will be redeclared using
+ the current scope's module and attachment. */
bool
-module_may_redeclare (tree decl)
+module_may_redeclare (tree olddecl, tree newdecl)
{
+ tree decl = olddecl;
for (;;)
{
tree ctx = CP_DECL_CONTEXT (decl);
@@ -19010,58 +19014,94 @@ module_may_redeclare (tree decl)
decl = TYPE_NAME (ctx);
}
- tree not_tmpl = STRIP_TEMPLATE (decl);
-
int use_tpl = 0;
- if (node_template_info (not_tmpl, use_tpl) && use_tpl)
+ if (node_template_info (STRIP_TEMPLATE (decl), use_tpl) && use_tpl)
// Specializations of any kind can be redeclared anywhere.
// FIXME: Should we be checking this in more places on the scope chain?
return true;
- if (!DECL_LANG_SPECIFIC (not_tmpl) || !DECL_MODULE_ATTACH_P (not_tmpl))
- // Decl is attached to global module. Current scope needs to be too.
- return !module_attach_p ();
+ module_state *old_mod = (*modules)[0];
+ module_state *new_mod = old_mod;
- module_state *me = (*modules)[0];
- module_state *them = me;
+ tree old_origin = get_originating_module_decl (decl);
+ tree old_inner = STRIP_TEMPLATE (old_origin);
+ bool olddecl_attached_p = (DECL_LANG_SPECIFIC (old_inner)
+ && DECL_MODULE_ATTACH_P (old_inner));
+ if (DECL_LANG_SPECIFIC (old_inner) && DECL_MODULE_IMPORT_P (old_inner))
+ {
+ unsigned index = import_entity_index (old_origin);
+ old_mod = import_entity_module (index);
+ }
- if (DECL_LANG_SPECIFIC (not_tmpl) && DECL_MODULE_IMPORT_P (not_tmpl))
+ bool newdecl_attached_p = module_attach_p ();
+ if (newdecl)
{
- /* We can be given the TEMPLATE_RESULT. We want the
- TEMPLATE_DECL. */
- int use_tpl = -1;
- if (tree ti = node_template_info (decl, use_tpl))
+ tree new_origin = get_originating_module_decl (newdecl);
+ tree new_inner = STRIP_TEMPLATE (new_origin);
+ newdecl_attached_p = (DECL_LANG_SPECIFIC (new_inner)
+ && DECL_MODULE_ATTACH_P (new_inner));
+ if (DECL_LANG_SPECIFIC (new_inner) && DECL_MODULE_IMPORT_P (new_inner))
{
- tree tmpl = TI_TEMPLATE (ti);
- if (use_tpl == 2)
- {
- /* A partial specialization. Find that specialization's
- template_decl. */
- for (tree list = DECL_TEMPLATE_SPECIALIZATIONS (tmpl);
- list; list = TREE_CHAIN (list))
- if (DECL_TEMPLATE_RESULT (TREE_VALUE (list)) == decl)
- {
- decl = TREE_VALUE (list);
- break;
- }
- }
- else if (DECL_TEMPLATE_RESULT (tmpl) == decl)
- decl = tmpl;
+ unsigned index = import_entity_index (new_origin);
+ new_mod = import_entity_module (index);
}
- unsigned index = import_entity_index (decl);
- them = import_entity_module (index);
}
- // Decl is attached to named module. Current scope needs to be
- // attaching to the same module.
- if (!module_attach_p ())
- return false;
+ /* Module attachment needs to match. */
+ if (olddecl_attached_p == newdecl_attached_p)
+ {
+ if (!olddecl_attached_p)
+ /* Both are GM entities, OK. */
+ return true;
- // Both attached to named module.
- if (me == them)
- return true;
+ if (new_mod == old_mod
+ || (new_mod && get_primary (new_mod) == get_primary (old_mod)))
+ /* Both attached to same named module, OK. */
+ return true;
+ }
+
+ /* Attached to different modules, error. */
+ decl = newdecl ? newdecl : olddecl;
+ location_t loc = newdecl ? DECL_SOURCE_LOCATION (newdecl) : input_location;
+ if (DECL_ARTIFICIAL (olddecl) && !DECL_IMPLICIT_TYPEDEF_P (olddecl))
+ error_at (loc, "declaration %qD conflicts with builtin", decl);
