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[130.44.159.43]) by smtp.gmail.com with ESMTPSA id s1-20020a05620a29c100b006eeb3165554sm63694qkp.19.2022.10.13.08.47.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 13 Oct 2022 08:47:43 -0700 (PDT) Message-ID: Date: Thu, 13 Oct 2022 11:47:42 -0400 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.2 Subject: Re: [PATCH v2] c++: parser - Support for target address spaces in C++ To: Paul Iannetta Cc: gcc-patches@gcc.gnu.org References: <20221006143400.es3u6ebqt3xkw6jp@ws2202.lin.mbt.kalray.eu> <697f23be-7318-1c87-5625-2411b1ab18a3@redhat.com> <20221009161256.p63tnxsqzwcnvh5h@ws2202.lin.mbt.kalray.eu> <20221011220017.pvs5jawrzqoaqkkf@ws2202.lin.mbt.kalray.eu> <19526772-3afb-87d1-190a-5ab0ffb566a9@redhat.com> <20221013005158.mfahyohzbywlyl7i@ws2202.lin.mbt.kalray.eu> <1bd40afb-f4ee-9f5d-87e5-ed35a26bd21f@redhat.com> <20221013152341.bztoqunwtmhdzi3f@ws2202.lin.mbt.kalray.eu> From: Jason Merrill In-Reply-To: <20221013152341.bztoqunwtmhdzi3f@ws2202.lin.mbt.kalray.eu> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-13.3 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,NICE_REPLY_A,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 10/13/22 11:23, Paul Iannetta wrote: > On Thu, Oct 13, 2022 at 11:02:24AM -0400, Jason Merrill wrote: >> On 10/12/22 20:52, Paul Iannetta wrote: >>> On Tue, Oct 11, 2022 at 09:49:43PM -0400, Jason Merrill wrote: >>>> >>>> It surprises that this is the only place we complain about an object with an >>>> address-space qualifier. Shouldn't we also complain about e.g. automatic >>>> variables/parameters or non-static data members with address-space qualified >>>> type? >>>> >>> >>> Indeed, I was missing quite a few things here. Thanks. >>> I used the draft as basis this time and imported from the C >>> implementation the relevant parts. This time, the errors get properly >>> emitted when an address space is unduly specified; and comparisons, >>> assignments and comparisons are taken care of. >>> >>> There are quite a few things I would like to clarify concerning some >>> implementation details. >>> - A variable with automatic storage (which is neither a pointer nor >>> a reference) cannot be qualified with an address space. I detect >>> this by the combination of `sc_none' and `! toplevel_bindings_p ()', >>> but I've also seen the use of `at_function_scope' at other places. >>> And I'm unsure which one is appropriate here. >>> This detection happens at the very end of grokdeclarator because I >>> need to know that the type is a pointer, which is not know until >>> very late in the function. >> >> At that point you have the decl, and you can ask directly what its storage >> duration is, perhaps using decl_storage_duration. >> >> But why do you need to know whether the type is a pointer? The attribute >> applies to the target type of the pointer, not the pointer type. I think >> the problem is that you're looking at declspecs when you ought to be looking >> at type_quals. > > I need to know that the base type is a pointer to reject invalid > declarations such as: > > int f (__seg_fs int a) { } or int f () { __seg_fs int a; } > > because parameters and auto variables can have an address space > qualifier only if they are pointer or reference type, which I can't > tell only from type_quals. But "int *__seg_fs a" is just as invalid as the above; the difference is not whether a is a pointer, but whether the address-space-qualified is the type of a itself or some sub-type. You need to look at the qualifiers on type (which should also be the ones in type_quals), not the qualifiers in the declspecs. >>> - I'm having some trouble deciding whether I include those three >>> stub programs as tests, they all compile fine and clang accepts >>> them as well. >> >> Why not? > > I thought they were pretty contrived, since it does not make much > sense to strip address space qualifiers, even though it does prove > that the implementation support those contrived but valid uses. Testcases are full of contrived examples testing corner cases. :) >> >>> Ex1: >>> ``` >>> int __seg_fs * fs1; >>> int __seg_gs * gs1; >>> >>> template struct strip; >>> template struct strip<__seg_fs T *> { typedef T type; }; >>> template struct strip<__seg_gs T *> { typedef T type; }; >>> >>> int >>> main () >>> { >>> *(strip::type *) fs1 == *(strip::type *) gs1; >>> return 0; >>> } >>> ``` >>> >>> Ex2: >>> ``` >>> int __seg_fs * fs1; >>> int __seg_fs * fs2; >>> >>> template auto f (T __seg_fs * a, U __seg_gs * b) { return a; } >>> template auto f (T __seg_gs * a, U __seg_fs * b) { return a; } >>> >>> int >>> main () >>> { >>> f (fs1, gs1); >>> f (gs1, fs1); >>> return 0; >>> } >>> ``` >>> >>> Ex3: >>> ``` >>> int __seg_fs * fs1; >>> int __seg_gs * gs1; >>> >>> template >>> auto f (T __seg_fs * a, U __seg_gs * b) >>> { >>> return *(T *) a == *(U *) b; >>> } >>> >>> int >>> main () >>> { >>> return f (fs1, gs1); >>> } >>> ``` >>> >>> >>> Add support for custom address spaces in C++ >>> >>> gcc/ >>> * tree.h (ENCODE_QUAL_ADDR_SPACE): Missing parentheses. >>> >>> gcc/c/ >>> * c-decl.cc: Remove c_register_addr_space. >>> >>> gcc/c-family/ >>> * c-common.cc (c_register_addr_space): Imported from c-decl.cc >>> (addr_space_superset): Imported from gcc/c/c-typecheck.cc >>> * c-common.h: Remove the FIXME. >>> (addr_space_superset): New declaration. >>> >>> gcc/cp/ >>> * cp-tree.h (enum cp_decl_spec): Add addr_space support. >>> (struct cp_decl_specifier_seq): Likewise. >>> * decl.cc (get_type_quals): Likewise. >>> (check_tag_decl): Likewise. >>> (grokdeclarator): Likewise. >>> * parser.cc (cp_parser_type_specifier): Likewise. >>> (cp_parser_cv_qualifier_seq_opt): Likewise. >>> (cp_parser_postfix_expression): Likewise. >>> (cp_parser_type_specifier): Likewise. >>> (set_and_check_decl_spec_loc): Likewise. >>> * typeck.cc (composite_pointer_type): Likewise >>> (comp_ptr_ttypes_real): Likewise. >>> (same_type_ignoring_top_level_qualifiers_p): Likewise. >>> * pt.cc (check_cv_quals_for_unify): Likewise. >>> (unify): Likewise. >>> * tree.cc: Remove c_register_addr_space stub. >>> * mangle.cc (write_CV_qualifiers_for_type): Mangle address spaces >>> using the extended qualifier notation. >>> >>> gcc/doc >>> * extend.texi (Named Address Spaces): add a mention about C++ >>> support. >>> >>> gcc/testsuite/ >>> * g++.dg/abi/mangle-addr-space1.C: New test. >>> * g++.dg/abi/mangle-addr-space2.C: New test. >>> * g++.dg/parse/addr-space.C: New test. >>> * g++.dg/parse/addr-space1.C: New test. >>> * g++.dg/parse/addr-space2.C: New test. >>> * g++.dg/parse/template/spec-addr-space.C: New test. >>> * g++.dg/ext/addr-space-decl.C: New test. >>> * g++.dg/ext/addr-space-ref.C: New test. >>> * g++.dg/ext/addr-space-ops.C: New test. >>> >>> # Please enter the commit message for your changes. Lines starting >>> # with '#' will be ignored, and an empty message aborts the commit. >>> # >>> # Date: Sun Oct 9 16:02:22 2022 +0200 >>> # >>> # On branch releases/gcc-12 >>> # Your branch is ahead of 'origin/releases/gcc-12' by 2 commits. >>> # (use "git push" to publish your local commits) >>> # >>> # Changes to be committed: >>> # modified: gcc/c-family/c-common.cc >>> # modified: gcc/c-family/c-common.h >>> # modified: gcc/c/c-decl.cc >>> # modified: gcc/c/c-typeck.cc >>> # modified: gcc/cp/cp-tree.h >>> # modified: gcc/cp/decl.cc >>> # modified: gcc/cp/mangle.cc >>> # modified: gcc/cp/parser.cc >>> # modified: gcc/cp/pt.cc >>> # modified: gcc/cp/tree.cc >>> # modified: gcc/cp/typeck.cc >>> # modified: gcc/doc/extend.texi >>> # new file: gcc/testsuite/g++.dg/abi/mangle-addr-space1.C >>> # new file: gcc/testsuite/g++.dg/abi/mangle-addr-space2.C >>> # new file: gcc/testsuite/g++.dg/ext/addr-space-decl.C >>> # new file: gcc/testsuite/g++.dg/ext/addr-space-ops.C >>> # new file: gcc/testsuite/g++.dg/ext/addr-space-ref.C >>> # new file: gcc/testsuite/g++.dg/parse/addr-space.C >>> # new file: gcc/testsuite/g++.dg/parse/addr-space1.C >>> # new file: gcc/testsuite/g++.dg/parse/addr-space2.C >>> # new file: gcc/testsuite/g++.dg/template/spec-addr-space.C >>> # modified: gcc/tree.h >>> # >>> # Untracked files: >>> # Makefile >>> # addr-space-decl.C >>> # addr-space-decl.s >>> # addr-space-ops.C >>> # addr-space-ref.C >>> # addr-space-template.C >>> # addr-space-template.s >>> # addr-space-template2.C >>> # addr-space-template2.C.006t.gimple >>> # addr-space-template2.s >>> # addr-space-traits.C >>> # addr-space4.C >>> # addr-space4.C.006t.gimple >>> # addr-space4.s >>> # build-x86_64-pc-linux-gnu/ >>> # compare >>> # host-x86_64-pc-linux-gnu/ >>> # mangle-addr-space1.s >>> # prev-x86_64-pc-linux-gnu/ >>> # rename >>> # stage1-x86_64-pc-linux-gnu/ >>> # stage_current >>> # stage_final >>> # stage_last >>> # x86_64-pc-linux-gnu/ >>> # >>> # ------------------------ >8 ------------------------ >>> # Do not modify or remove the line above. >>> # Everything below it will be ignored. >>> diff --git a/gcc/c-family/c-common.cc b/gcc/c-family/c-common.cc >>> index bb0544eeaea..ff1146ecc25 100644 >>> --- a/gcc/c-family/c-common.cc >>> +++ b/gcc/c-family/c-common.cc >>> @@ -615,6 +615,33 @@ c_addr_space_name (addr_space_t as) >>> return IDENTIFIER_POINTER (ridpointers [rid]); >>> } >>> +/* Return true if between two named address spaces, whether there is a superset >>> + named address space that encompasses both address spaces. If there is a >>> + superset, return which address space is the superset. */ >>> + >>> +bool >>> +addr_space_superset (addr_space_t as1, addr_space_t as2, >>> + addr_space_t * common) >>> +{ >>> + if (as1 == as2) >>> + { >>> + *common = as1; >>> + return true; >>> + } >>> + else if (targetm.addr_space.subset_p (as1, as2)) >>> + { >>> + *common = as2; >>> + return true; >>> + } >>> + else if (targetm.addr_space.subset_p (as2, as1)) >>> + { >>> + *common = as1; >>> + return true; >>> + } >>> + else >>> + return false; >>> +} >>> + >>> /* Push current bindings for the function name VAR_DECLS. */ >>> void >>> @@ -2809,6 +2836,25 @@ c_build_bitfield_integer_type (unsigned HOST_WIDE_INT width, int unsignedp) >>> return build_nonstandard_integer_type (width, unsignedp); >>> } >>> +/* Register reserved keyword WORD as qualifier for address space AS. */ >>> + >>> +void >>> +c_register_addr_space (const char *word, addr_space_t as) >>> +{ >>> + int rid = RID_FIRST_ADDR_SPACE + as; >>> + tree id; >>> + >>> + /* Address space qualifiers are only supported >>> + in C with GNU extensions enabled. */ >>> + if (c_dialect_objc () || flag_no_asm) >>> + return; >>> + >>> + id = get_identifier (word); >>> + C_SET_RID_CODE (id, rid); >>> + TREE_LANG_FLAG_0 (id) = 1; >>> + ridpointers[rid] = id; >>> +} >>> + >>> /* The C version of the register_builtin_type langhook. */ >>> void >>> diff --git a/gcc/c-family/c-common.h b/gcc/c-family/c-common.h >>> index 52a85bfb783..d36f9e4975b 100644 >>> --- a/gcc/c-family/c-common.h >>> +++ b/gcc/c-family/c-common.h >>> @@ -829,12 +829,11 @@ extern const struct attribute_spec c_common_format_attribute_table[]; >>> extern tree (*make_fname_decl) (location_t, tree, int); >>> -/* In c-decl.cc and cp/tree.cc. FIXME. */ >>> -extern void c_register_addr_space (const char *str, addr_space_t as); >>> - >>> /* In c-common.cc. */ >>> extern bool in_late_binary_op; >>> extern const char *c_addr_space_name (addr_space_t as); >>> +extern const char *c_addr_space_name (addr_space_t as); >>> +extern bool addr_space_superset (addr_space_t, addr_space_t, addr_space_t *); >>> extern tree identifier_global_value (tree); >>> extern tree identifier_global_tag (tree); >>> extern bool names_builtin_p (const char *); >>> @@ -952,6 +951,7 @@ extern void c_common_finish (void); >>> extern void c_common_parse_file (void); >>> extern FILE *get_dump_info (int, dump_flags_t *); >>> extern alias_set_type c_common_get_alias_set (tree); >>> +extern void c_register_addr_space (const char *, addr_space_t); >>> extern void c_register_builtin_type (tree, const char*); >>> extern bool c_promoting_integer_type_p (const_tree); >>> extern bool self_promoting_args_p (const_tree); >>> diff --git a/gcc/c/c-decl.cc b/gcc/c/c-decl.cc >>> index c701f07befe..e1bb4f1cf37 100644 >>> --- a/gcc/c/c-decl.cc >>> +++ b/gcc/c/c-decl.cc >>> @@ -12337,25 +12337,6 @@ c_parse_final_cleanups (void) >>> ext_block = NULL; >>> } >>> -/* Register reserved keyword WORD as qualifier for address space AS. */ >>> - >>> -void >>> -c_register_addr_space (const char *word, addr_space_t as) >>> -{ >>> - int rid = RID_FIRST_ADDR_SPACE + as; >>> - tree id; >>> - >>> - /* Address space qualifiers are only supported >>> - in C with GNU extensions enabled. */ >>> - if (c_dialect_objc () || flag_no_asm) >>> - return; >>> - >>> - id = get_identifier (word); >>> - C_SET_RID_CODE (id, rid); >>> - C_IS_RESERVED_WORD (id) = 1; >>> - ridpointers [rid] = id; >>> -} >>> - >>> /* Return identifier to look up for omp declare reduction. */ >>> tree >>> diff --git a/gcc/c/c-typeck.cc b/gcc/c/c-typeck.cc >>> index b271af9bedb..c4b01368534 100644 >>> --- a/gcc/c/c-typeck.cc >>> +++ b/gcc/c/c-typeck.cc >>> @@ -296,32 +296,6 @@ c_type_promotes_to (tree type) >>> return type; >>> } >>> -/* Return true if between two named address spaces, whether there is a superset >>> - named address space that encompasses both address spaces. If there is a >>> - superset, return which address space is the superset. */ >>> - >>> -static bool >>> -addr_space_superset (addr_space_t as1, addr_space_t as2, addr_space_t *common) >>> -{ >>> - if (as1 == as2) >>> - { >>> - *common = as1; >>> - return true; >>> - } >>> - else if (targetm.addr_space.subset_p (as1, as2)) >>> - { >>> - *common = as2; >>> - return true; >>> - } >>> - else if (targetm.addr_space.subset_p (as2, as1)) >>> - { >>> - *common = as1; >>> - return true; >>> - } >>> - else >>> - return false; >>> -} >>> - >>> /* Return a variant of TYPE which has all the type qualifiers of LIKE >>> as well as those of TYPE. */ >>> diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h >>> index 72f4398a8f9..82a6d72f5df 100644 >>> --- a/gcc/cp/cp-tree.h >>> +++ b/gcc/cp/cp-tree.h >>> @@ -6206,6 +6206,7 @@ enum cp_decl_spec { >>> ds_const, >>> ds_volatile, >>> ds_restrict, >>> + ds_addr_space, >>> ds_inline, >>> ds_virtual, >>> ds_explicit, >>> @@ -6252,6 +6253,8 @@ struct cp_decl_specifier_seq { >>> cp_storage_class storage_class; >>> /* For the __intN declspec, this stores the index into the int_n_* arrays. */ >>> int int_n_idx; >>> + /* The address space that the declaration belongs to. */ >>> + addr_space_t address_space; >>> /* True iff TYPE_SPEC defines a class or enum. */ >>> BOOL_BITFIELD type_definition_p : 1; >>> /* True iff multiple types were (erroneously) specified for this >>> diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc >>> index 9f78c500a15..fa5a1ddb21d 100644 >>> --- a/gcc/cp/decl.cc >>> +++ b/gcc/cp/decl.cc >>> @@ -5280,6 +5280,8 @@ get_type_quals (const cp_decl_specifier_seq *declspecs) >>> type_quals |= TYPE_QUAL_VOLATILE; >>> if (decl_spec_seq_has_spec_p (declspecs, ds_restrict)) >>> type_quals |= TYPE_QUAL_RESTRICT; >>> + if (decl_spec_seq_has_spec_p (declspecs, ds_addr_space)) >>> + type_quals |= ENCODE_QUAL_ADDR_SPACE (declspecs->address_space); >>> return type_quals; >>> } >>> @@ -5402,6 +5404,10 @@ check_tag_decl (cp_decl_specifier_seq *declspecs, >>> error_at (declspecs->locations[ds_restrict], >>> "%<__restrict%> can only be specified for objects and " >>> "functions"); >>> + else if (decl_spec_seq_has_spec_p (declspecs, ds_addr_space)) >>> + error_at (declspecs->locations[ds_addr_space], >>> + "address space can only be specified for objects and " >>> + "functions"); >>> else if (decl_spec_seq_has_spec_p (declspecs, ds_thread)) >>> error_at (declspecs->locations[ds_thread], >>> "%<__thread%> can only be specified for objects " >>> @@ -14572,6 +14578,57 @@ grokdeclarator (const cp_declarator *declarator, >>> if (!processing_template_decl) >>> cp_apply_type_quals_to_decl (type_quals, decl); >>> + addr_space_t address_space = declspecs->address_space; >>> + if (!ADDR_SPACE_GENERIC_P (address_space) && !INDIRECT_TYPE_P (type)) >>> + { >>> + if (decl_context == NORMAL) >>> + { >>> + switch (storage_class) >>> + { >>> + case sc_auto: >>> + error ("%qs combined with C++98 % qualifier for %qs", >>> + c_addr_space_name (address_space), name); >>> + break; >>> + case sc_register: >>> + error ("%qs combined with % qualifier for %qs", >>> + c_addr_space_name (address_space), name); >>> + break; >>> + case sc_none: >>> + if (! toplevel_bindings_p ()) >>> + error ("%qs specified for auto variable %qs", >>> + c_addr_space_name (address_space), name); >>> + break; >>> + case sc_mutable: >>> + error ("%qs combined with % qualifier for %qs", >>> + c_addr_space_name (address_space), name); >>> + break; >>> + case sc_static: >>> + case sc_extern: >>> + break; >>> + default: >>> + gcc_unreachable (); >>> + } >>> + } >>> + else if (decl_context == PARM && TREE_CODE (type) != ARRAY_TYPE) >>> + { >>> + if (name) >>> + error ("%qs specified for parameter %qs", >>> + c_addr_space_name (address_space), name); >>> + else >>> + error ("%qs specified for unnamed parameter", >>> + c_addr_space_name (address_space)); >>> + } >>> + else if (decl_context == FIELD) >>> + { >>> + if (name) >>> + error ("%qs specified for structure field %qs", >>> + c_addr_space_name (address_space), name); >>> + else >>> + error ("%qs specified for structure field", >>> + c_addr_space_name (address_space)); >>> + } >>> + } >>> + >>> return decl; >>> } >>> } >>> diff --git a/gcc/cp/mangle.cc b/gcc/cp/mangle.cc >>> index eb53e0ebeb4..16cb2ff4332 100644 >>> --- a/gcc/cp/mangle.cc >>> +++ b/gcc/cp/mangle.cc >>> @@ -2509,6 +2509,14 @@ write_CV_qualifiers_for_type (const tree type) >>> array. */ >>> cp_cv_quals quals = TYPE_QUALS (type); >>> + if (addr_space_t as = DECODE_QUAL_ADDR_SPACE (quals)) >>> + { >>> + const char *as_name = c_addr_space_name (as); >>> + write_char ('U'); >>> + write_unsigned_number (strlen (as_name)); >>> + write_string (as_name); >>> + ++num_qualifiers; >>> + } >>> if (quals & TYPE_QUAL_RESTRICT) >>> { >>> write_char ('r'); >>> diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc >>> index 763df6f479b..f0169d83ab0 100644 >>> --- a/gcc/cp/parser.cc >>> +++ b/gcc/cp/parser.cc >>> @@ -7640,6 +7640,14 @@ cp_parser_postfix_expression (cp_parser *parser, bool address_p, bool cast_p, >>> postfix_expression = error_mark_node; >>> break; >>> } >>> + if (type != error_mark_node >>> + && !ADDR_SPACE_GENERIC_P (TYPE_ADDR_SPACE (type)) >>> + && current_function_decl) >>> + { >>> + error >>> + ("compound literal qualified by address-space qualifier"); >>> + type = error_mark_node; >>> + } >>> /* Form the representation of the compound-literal. */ >>> postfix_expression >>> = finish_compound_literal (type, initializer, >>> @@ -19408,6 +19416,15 @@ cp_parser_type_specifier (cp_parser* parser, >>> break; >>> } >>> + >>> + if (RID_FIRST_ADDR_SPACE <= keyword && keyword <= RID_LAST_ADDR_SPACE) >>> + { >>> + ds = ds_addr_space; >>> + if (is_cv_qualifier) >>> + *is_cv_qualifier = true; >>> + } >>> + >>> + >>> /* Handle simple keywords. */ >>> if (ds != ds_last) >>> { >>> @@ -23776,6 +23793,7 @@ cp_parser_ptr_operator (cp_parser* parser, >>> GNU Extension: >>> cv-qualifier: >>> + address-space-qualifier >>> __restrict__ >>> Returns a bitmask representing the cv-qualifiers. */ >>> @@ -23812,6 +23830,11 @@ cp_parser_cv_qualifier_seq_opt (cp_parser* parser) >>> break; >>> } >>> + if (RID_FIRST_ADDR_SPACE <= token->keyword && >>> + token->keyword <= RID_LAST_ADDR_SPACE) >>> + cv_qualifier = >>> + ENCODE_QUAL_ADDR_SPACE (token->keyword - RID_FIRST_ADDR_SPACE); >>> + >>> if (!cv_qualifier) >>> break; >>> @@ -32705,6 +32728,8 @@ set_and_check_decl_spec_loc (cp_decl_specifier_seq *decl_specs, >>> decl_specs->locations[ds] = location; >>> if (ds == ds_thread) >>> decl_specs->gnu_thread_keyword_p = token_is__thread (token); >>> + else if (ds == ds_addr_space) >>> + decl_specs->address_space = token->keyword - RID_FIRST_ADDR_SPACE; >>> } >>> else >>> { >>> @@ -32737,6 +32762,25 @@ set_and_check_decl_spec_loc (cp_decl_specifier_seq *decl_specs, >>> error_at (&richloc, "duplicate %qD", token->u.value); >>> } >>> } >>> + else if (ds == ds_addr_space) >>> + { >>> + addr_space_t as1 = decl_specs->address_space; >>> + addr_space_t as2 = token->keyword - RID_FIRST_ADDR_SPACE; >>> + >>> + gcc_rich_location richloc (location); >>> + richloc.add_fixit_remove (); >>> + if (!ADDR_SPACE_GENERIC_P (as1) && !ADDR_SPACE_GENERIC_P (as2) >>> + && as1 != as2) >>> + error_at (&richloc, >>> + "conflicting named address spaces (%s vs %s)", >>> + c_addr_space_name (as1), c_addr_space_name (as2)); >>> + if (as1 == as2 && !ADDR_SPACE_GENERIC_P (as1)) >>> + error_at (&richloc, >>> + "duplicate named address space %s", >>> + c_addr_space_name (as1)); >>> + >>> + decl_specs->address_space = as2; >>> + } >>> else >>> { >>> static const char *const decl_spec_names[] = { >>> diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc >>> index bef31416fb7..c9d1c01f4ce 100644 >>> --- a/gcc/cp/pt.cc >>> +++ b/gcc/cp/pt.cc >>> @@ -23655,8 +23655,19 @@ template_decl_level (tree decl) >>> static int >>> check_cv_quals_for_unify (int strict, tree arg, tree parm) >>> { >>> - int arg_quals = cp_type_quals (arg); >>> - int parm_quals = cp_type_quals (parm); >>> + int arg_quals = CLEAR_QUAL_ADDR_SPACE (cp_type_quals (arg)); >>> + int parm_quals = CLEAR_QUAL_ADDR_SPACE (cp_type_quals (parm)); >>> + >>> + /* Try to unify ARG's address space into PARM's address space. >>> + If PARM does not have any address space qualifiers (ie., as_parm is 0), >>> + there are no constraints on address spaces for this type. */ >>> + addr_space_t as_arg = DECODE_QUAL_ADDR_SPACE (cp_type_quals (arg)); >>> + addr_space_t as_parm = DECODE_QUAL_ADDR_SPACE (cp_type_quals (parm)); >>> + addr_space_t as_common; >>> + addr_space_superset (as_arg, as_parm, &as_common); >>> + >>> + if (!(as_parm == as_common || as_parm == 0)) >>> + return 0; >>> if (TREE_CODE (parm) == TEMPLATE_TYPE_PARM >>> && !(strict & UNIFY_ALLOW_OUTER_MORE_CV_QUAL)) >>> @@ -24292,10 +24303,26 @@ unify (tree tparms, tree targs, tree parm, tree arg, int strict, >>> arg, parm)) >>> return unify_cv_qual_mismatch (explain_p, parm, arg); >>> + int arg_cv_quals = cp_type_quals (arg); >>> + int parm_cv_quals = cp_type_quals (parm); >>> + >>> + /* If PARM does not contain any address space constraints it can >>> + fully match the address space of ARG. However, if PARM contains an >>> + address space constraint, it becomes the upper bound. That is, >>> + AS_ARG may be promoted to AS_PARM but not the converse. If we >>> + ended up here, it means that `check_cv_quals_for_unify' succeeded >>> + and that either AS_PARM is 0 (ie., no constraints) or AS_COMMON == >>> + AS_PARM. */ >>> + addr_space_t as_arg = DECODE_QUAL_ADDR_SPACE (arg_cv_quals); >>> + addr_space_t as_parm = DECODE_QUAL_ADDR_SPACE (parm_cv_quals); >>> + addr_space_t as_common = as_parm ? 0 : as_arg; >>> + >>> /* Consider the case where ARG is `const volatile int' and >>> PARM is `const T'. Then, T should be `volatile int'. */ >>> - arg = cp_build_qualified_type_real >>> - (arg, cp_type_quals (arg) & ~cp_type_quals (parm), tf_none); >>> + int unified_cv = >>> + CLEAR_QUAL_ADDR_SPACE (arg_cv_quals & ~parm_cv_quals) >>> + | ENCODE_QUAL_ADDR_SPACE (as_common); >>> + arg = cp_build_qualified_type_real (arg, unified_cv, tf_none); >>> if (arg == error_mark_node) >>> return unify_invalid (explain_p); >>> diff --git a/gcc/cp/tree.cc b/gcc/cp/tree.cc >>> index 3b37567cbd7..5e14ac837fc 100644 >>> --- a/gcc/cp/tree.cc >>> +++ b/gcc/cp/tree.cc >>> @@ -6048,15 +6048,6 @@ cp_free_lang_data (tree t) >>> DECL_CHAIN (t) = NULL_TREE; >>> } >>> -/* Stub for c-common. Please keep in sync with c-decl.cc. >>> - FIXME: If address space support is target specific, then this >>> - should be a C target hook. But currently this is not possible, >>> - because this function is called via REGISTER_TARGET_PRAGMAS. */ >>> -void >>> -c_register_addr_space (const char * /*word*/, addr_space_t /*as*/) >>> -{ >>> -} >>> - >>> /* Return the number of operands in T that we care about for things like >>> mangling. */ >>> diff --git a/gcc/cp/typeck.cc b/gcc/cp/typeck.cc >>> index ceb80d9744f..7d810c6a12c 100644 >>> --- a/gcc/cp/typeck.cc >>> +++ b/gcc/cp/typeck.cc >>> @@ -656,10 +656,26 @@ composite_pointer_type (const op_location_t &location, >>> else >>> return error_mark_node; >>> } >>> + /* If possible merge the address space into the superset of the address >>> + spaces of t1 and t2, or raise an error. */ >>> + addr_space_t as_t1 = TYPE_ADDR_SPACE (t1); >>> + addr_space_t as_t2 = TYPE_ADDR_SPACE (t2); >>> + addr_space_t as_common; >>> + >>> + /* If the two named address spaces are different, determine the common >>> + superset address space. If there isn't one, raise an error. */ >>> + if (!addr_space_superset (as_t1, as_t2, &as_common)) >>> + { >>> + as_common = as_t1; >>> + error_at (location, >>> + "%qT and %qT are in disjoint named address spaces", >>> + t1, t2); >>> + } >>> result_type >>> = cp_build_qualified_type (void_type_node, >>> - (cp_type_quals (TREE_TYPE (t1)) >>> - | cp_type_quals (TREE_TYPE (t2)))); >>> + (CLEAR_QUAL_ADDR_SPACE (cp_type_quals (TREE_TYPE (t1))) >>> + | CLEAR_QUAL_ADDR_SPACE (cp_type_quals (TREE_TYPE (t2))) >>> + | ENCODE_QUAL_ADDR_SPACE (as_common))); >>> result_type = build_pointer_type (result_type); >>> /* Merge the attributes. */ >>> attributes = (*targetm.merge_type_attributes) (t1, t2); >>> @@ -1579,7 +1595,9 @@ comptypes (tree t1, tree t2, int strict) >>> } >>> /* Returns nonzero iff TYPE1 and TYPE2 are the same type, ignoring >>> - top-level qualifiers. */ >>> + top-level qualifiers, except for named address spaces. If the pointers point >>> + to different named addresses spaces, then we must determine if one address >>> + space is a subset of the other. */ >>> bool >>> same_type_ignoring_top_level_qualifiers_p (tree type1, tree type2) >>> @@ -1589,6 +1607,14 @@ same_type_ignoring_top_level_qualifiers_p (tree type1, tree type2) >>> if (type1 == type2) >>> return true; >>> + addr_space_t as_type1 = TYPE_ADDR_SPACE (type1); >>> + addr_space_t as_type2 = TYPE_ADDR_SPACE (type2); >>> + addr_space_t as_common; >>> + >>> + /* Fail if pointers point to incompatible address spaces. */ >>> + if (!addr_space_superset (as_type1, as_type2, &as_common)) >>> + return false; >>> + >>> type1 = cp_build_qualified_type (type1, TYPE_UNQUALIFIED); >>> type2 = cp_build_qualified_type (type2, TYPE_UNQUALIFIED); >>> return same_type_p (type1, type2); >>> @@ -6374,10 +6400,32 @@ static tree >>> pointer_diff (location_t loc, tree op0, tree op1, tree ptrtype, >>> tsubst_flags_t complain, tree *instrument_expr) >>> { >>> - tree result, inttype; >>> tree restype = ptrdiff_type_node; >>> + tree result, inttype; >>> + >>> + addr_space_t as0 = TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (op0))); >>> + addr_space_t as1 = TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (op1))); >>> tree target_type = TREE_TYPE (ptrtype); >>> + /* If the operands point into different address spaces, we need to >>> + explicitly convert them to pointers into the common address space >>> + before we can subtract the numerical address values. */ >>> + if (as0 != as1) >>> + { >>> + addr_space_t as_common; >>> + tree common_type; >>> + >>> + /* Determine the common superset address space. This is guaranteed >>> + to exist because the caller verified that comp_target_types >>> + returned non-zero. */ >>> + if (!addr_space_superset (as0, as1, &as_common)) >>> + gcc_unreachable (); >>> + >>> + common_type = common_pointer_type (TREE_TYPE (op0), TREE_TYPE (op1)); >>> + op0 = convert (common_type, op0); >>> + op1 = convert (common_type, op1); >>> + } >>> + >>> if (!complete_type_or_maybe_complain (target_type, NULL_TREE, complain)) >>> return error_mark_node; >>> @@ -10805,6 +10853,19 @@ comp_ptr_ttypes_real (tree to, tree from, int constp) >>> to_more_cv_qualified = true; >>> } >>> + /* Warn about conversions between pointers to disjoint >>> + address spaces. */ >>> + if (TREE_CODE (from) == POINTER_TYPE >>> + && TREE_CODE (to) == POINTER_TYPE) >>> + { >>> + addr_space_t as_from = TYPE_ADDR_SPACE (TREE_TYPE (from)); >>> + addr_space_t as_to = TYPE_ADDR_SPACE (TREE_TYPE (to)); >>> + addr_space_t as_common; >>> + >>> + if (!addr_space_superset (as_to, as_from, &as_common)) >>> + return false; >>> + } >>> + >>> if (constp > 0) >>> constp &= TYPE_READONLY (to); >>> } >>> diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi >>> index ac3db88566d..1e0d436c02c 100644 >>> --- a/gcc/doc/extend.texi >>> +++ b/gcc/doc/extend.texi >>> @@ -1448,7 +1448,7 @@ Fixed-point types are supported by the DWARF debug information format. >>> @section Named Address Spaces >>> @cindex Named Address Spaces >>> -As an extension, GNU C supports named address spaces as >>> +As an extension, GNU C and GNU C++ support named address spaces as >>> defined in the N1275 draft of ISO/IEC DTR 18037. Support for named >>> address spaces in GCC will evolve as the draft technical report >>> changes. Calling conventions for any target might also change. At >>> diff --git a/gcc/testsuite/g++.dg/abi/mangle-addr-space1.C b/gcc/testsuite/g++.dg/abi/mangle-addr-space1.C >>> new file mode 100644 >>> index 00000000000..c01f8d6054a >>> --- /dev/null >>> +++ b/gcc/testsuite/g++.dg/abi/mangle-addr-space1.C >>> @@ -0,0 +1,10 @@ >>> +// { dg-do run { target { i?86-*-* x86_64-*-* } } } >>> +// { dg-options "-fabi-version=8 -Wabi -save-temps" } >>> +// { dg-final { scan-assembler "_Z1fPU8__seg_fsVi" } } >>> + >>> +int f (int volatile __seg_fs *a) >>> +{ >>> + return *a; >>> +} >>> + >>> +int main () {} >>> diff --git a/gcc/testsuite/g++.dg/abi/mangle-addr-space2.C b/gcc/testsuite/g++.dg/abi/mangle-addr-space2.C >>> new file mode 100644 >>> index 00000000000..862bbbdcdf2 >>> --- /dev/null >>> +++ b/gcc/testsuite/g++.dg/abi/mangle-addr-space2.C >>> @@ -0,0 +1,9 @@ >>> +// { dg-do run { target { i?86-*-* x86_64-*-* } } } >>> +// { dg-options "-fabi-version=8 -Wabi -save-temps" } >>> +// { dg-final { scan-assembler "_Z1fIU8__seg_fsiEiPT_" } } >>> + >>> +template >>> +int f (T *p) { return *p; } >>> +int g (__seg_fs int *p) { return *p; } >>> +__seg_fs int *a; >>> +int main() { f(a); } >>> diff --git a/gcc/testsuite/g++.dg/ext/addr-space-decl.C b/gcc/testsuite/g++.dg/ext/addr-space-decl.C >>> new file mode 100644 >>> index 00000000000..c04d2f497da >>> --- /dev/null >>> +++ b/gcc/testsuite/g++.dg/ext/addr-space-decl.C >>> @@ -0,0 +1,5 @@ >>> +// { dg-do compile { target { i?86-*-* x86_64-*-* } } } >>> +__seg_fs char a, b, c; >>> +__seg_fs const int *p; >>> +static /* give internal linkage to the following anonymous struct */ >>> +__seg_fs struct { int a; char b; } * __seg_gs q; >>> diff --git a/gcc/testsuite/g++.dg/ext/addr-space-ops.C b/gcc/testsuite/g++.dg/ext/addr-space-ops.C >>> new file mode 100644 >>> index 00000000000..86c02d1e7f5 >>> --- /dev/null >>> +++ b/gcc/testsuite/g++.dg/ext/addr-space-ops.C >>> @@ -0,0 +1,20 @@ >>> +// { dg-do compile { target { i?86-*-* x86_64-*-* } } } >>> +int __seg_fs * fs1; >>> +int __seg_fs * fs2; >>> +float __seg_gs * gs1; >>> +float __seg_gs * gs2; >>> + >>> +int >>> +main () >>> +{ >>> + fs1 + fs2; // { dg-error "invalid operands of types .__seg_fs int.. and .__seg_fs int.. to binary .operator.." } >>> + fs1 - fs2; >>> + fs1 - gs2; // { dg-error "invalid operands of types .__seg_fs int.. and .__seg_gs float.. to binary .operator.." } >>> + fs1 == fs2; >>> + fs1 != gs2; // { dg-error "comparison between distinct pointer types .__seg_fs int.. and .__seg_gs float.. lacks a cast" } >>> + fs1 = fs2; >>> + fs1 = gs2; // { dg-error "cannot convert .__seg_gs float.. to .__seg_fs int.. in assignment" } >>> + fs1 > fs2; >>> + fs1 < gs2; // { dg-error "comparison between distinct pointer types .__seg_fs int.. and .__seg_gs float.. lacks a cast" } >>> + return 0; >>> +} >>> diff --git a/gcc/testsuite/g++.dg/ext/addr-space-ref.C b/gcc/testsuite/g++.dg/ext/addr-space-ref.C >>> new file mode 100644 >>> index 00000000000..12d7975e560 >>> --- /dev/null >>> +++ b/gcc/testsuite/g++.dg/ext/addr-space-ref.C >>> @@ -0,0 +1,31 @@ >>> +// { dg-do compile { target { i?86-*-* x86_64-*-* } } } >>> +// { dg-prune-output "does not allow .register. storage class specifier" } >>> +int __seg_fs * outer_b; >>> + >>> +struct s { >>> + __seg_fs int * ok; >>> + __seg_gs int ko; // { dg-error ".__seg_gs. specified for structure field .ko." } >>> +}; >>> + >>> +int register __seg_fs reg_fs; // { dg-error ".__seg_fs. combined with .register. qualifier for .reg_fs." } >>> + >>> +namespace ns_a >>> +{ >>> + int __seg_fs * inner_b; >>> + >>> + template >>> + int f (T &a) { return a; } >>> + int g (__seg_fs int a) { return a; } // { dg-error ".__seg_fs. specified for parameter .a." } >>> + int h (__seg_fs int *a) { return *a; } >>> +} >>> + >>> +int >>> +main () >>> +{ >>> + int register __seg_gs reg_gs; // { dg-error ".__seg_gs. combined with .register. qualifier for .reg_gs." } >>> + static __seg_gs int static_gs; >>> + __seg_fs int auto_fs; // { dg-error ".__seg_fs. specified for auto variable .auto_fs." } >>> + __seg_fs int *pa = outer_b; >>> + __seg_fs int& ra = *ns_a::inner_b; >>> + return ns_a::f(ra) + ns_a::f(*pa); >>> +} >>> diff --git a/gcc/testsuite/g++.dg/parse/addr-space.C b/gcc/testsuite/g++.dg/parse/addr-space.C >>> new file mode 100644 >>> index 00000000000..ebb6316054a >>> --- /dev/null >>> +++ b/gcc/testsuite/g++.dg/parse/addr-space.C >>> @@ -0,0 +1,9 @@ >>> +// { dg-do compile { target { i?86-*-* x86_64-*-* } } } >>> + >>> +__seg_fs struct foo; // { dg-error "address space can only be specified for objects and functions" } >>> + >>> +int >>> +main () >>> +{ >>> + return 0; >>> +} >>> diff --git a/gcc/testsuite/g++.dg/parse/addr-space1.C b/gcc/testsuite/g++.dg/parse/addr-space1.C >>> new file mode 100644 >>> index 00000000000..2e8ee32a885 >>> --- /dev/null >>> +++ b/gcc/testsuite/g++.dg/parse/addr-space1.C >>> @@ -0,0 +1,10 @@ >>> +// { dg-do compile { target { i?86-*-* x86_64-*-* } } } >>> +// { dg-options "-std=gnu++98" } >>> + >>> +int >>> +main () >>> +{ >>> + struct foo {int a; char b[2];} structure; >>> + structure = ((__seg_fs struct foo) {1 + 2, 'a', 0}); // { dg-error "compound literal qualified by address-space qualifier" } >>> + return 0; >>> +} >>> diff --git a/gcc/testsuite/g++.dg/parse/addr-space2.C b/gcc/testsuite/g++.dg/parse/addr-space2.C >>> new file mode 100644 >>> index 00000000000..5b2c0f28078 >>> --- /dev/null >>> +++ b/gcc/testsuite/g++.dg/parse/addr-space2.C >>> @@ -0,0 +1,9 @@ >>> +// { dg-do compile { target { i?86-*-* x86_64-*-* } } } >>> + >>> +__seg_fs __seg_gs int *a; // { dg-error "conflicting named address spaces .__seg_fs vs __seg_gs." } >>> + >>> +int >>> +main () >>> +{ >>> + return 0; >>> +} >>> diff --git a/gcc/testsuite/g++.dg/template/spec-addr-space.C b/gcc/testsuite/g++.dg/template/spec-addr-space.C >>> new file mode 100644 >>> index 00000000000..ae9f4de0e1f >>> --- /dev/null >>> +++ b/gcc/testsuite/g++.dg/template/spec-addr-space.C >>> @@ -0,0 +1,8 @@ >>> +// { dg-do compile { target { i?86-*-* x86_64-*-* } } } >>> + >>> +template >>> +int f (T __seg_gs *p) { return *p; } // { dg-note "candidate: 'template int f.__seg_gs T\*." } >>> + // { dg-note "template argument deduction/substitution failed:" "" { target *-*-* } .-1 } >>> +__seg_fs int *a; >>> +int main() { f(a); } // { dg-error "no matching" } >>> +// { dg-note "types .__seg_gs T. and .__seg_fs int. have incompatible cv-qualifiers" "" { target *-*-* } .-1 } >>> diff --git a/gcc/tree.h b/gcc/tree.h >>> index 8844471e9a5..b7da4c5141a 100644 >>> --- a/gcc/tree.h >>> +++ b/gcc/tree.h >>> @@ -2229,7 +2229,7 @@ extern tree vector_element_bits_tree (const_tree); >>> /* Encode/decode the named memory support as part of the qualifier. If more >>> than 8 qualifiers are added, these macros need to be adjusted. */ >>> -#define ENCODE_QUAL_ADDR_SPACE(NUM) ((NUM & 0xFF) << 8) >>> +#define ENCODE_QUAL_ADDR_SPACE(NUM) (((NUM) & 0xFF) << 8) >>> #define DECODE_QUAL_ADDR_SPACE(X) (((X) >> 8) & 0xFF) >>> /* Return all qualifiers except for the address space qualifiers. */ >>> >>> >>> >>> >> >> >> >> >> >> >> > > > > >