| /* General Solaris system support. |
| Copyright (C) 2004-2021 Free Software Foundation, Inc. |
| Contributed by CodeSourcery, LLC. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3, or (at your option) |
| any later version. |
| |
| GCC is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "target.h" |
| #include "rtl.h" |
| #include "tree.h" |
| #include "memmodel.h" |
| #include "tm_p.h" |
| #include "stringpool.h" |
| #include "attribs.h" |
| #include "diagnostic-core.h" |
| #include "varasm.h" |
| #include "output.h" |
| |
| tree solaris_pending_aligns, solaris_pending_inits, solaris_pending_finis; |
| |
| /* Attach any pending attributes for DECL to the list in *ATTRIBUTES. |
| Pending attributes come from #pragma or _Pragma, so this code is |
| only useful in the C family front ends, but it is included in |
| all languages to avoid changing the target machine initializer |
| depending on the language. */ |
| |
| void |
| solaris_insert_attributes (tree decl, tree *attributes) |
| { |
| tree *x, next; |
| |
| if (solaris_pending_aligns != NULL && TREE_CODE (decl) == VAR_DECL) |
| for (x = &solaris_pending_aligns; *x; x = &TREE_CHAIN (*x)) |
| { |
| tree name = TREE_PURPOSE (*x); |
| tree value = TREE_VALUE (*x); |
| if (DECL_NAME (decl) == name) |
| { |
| if (lookup_attribute ("aligned", DECL_ATTRIBUTES (decl)) |
| || lookup_attribute ("aligned", *attributes)) |
| warning (0, "ignoring %<#pragma align%> for explicitly " |
| "aligned %q+D", decl); |
| else |
| *attributes = tree_cons (get_identifier ("aligned"), value, |
| *attributes); |
| next = TREE_CHAIN (*x); |
| ggc_free (*x); |
| *x = next; |
| break; |
| } |
| } |
| |
| if (solaris_pending_inits != NULL && TREE_CODE (decl) == FUNCTION_DECL) |
| for (x = &solaris_pending_inits; *x; x = &TREE_CHAIN (*x)) |
| { |
| tree name = TREE_PURPOSE (*x); |
| if (DECL_NAME (decl) == name) |
| { |
| *attributes = tree_cons (get_identifier ("init"), NULL, |
| *attributes); |
| TREE_USED (decl) = 1; |
| DECL_PRESERVE_P (decl) = 1; |
| next = TREE_CHAIN (*x); |
| ggc_free (*x); |
| *x = next; |
| break; |
| } |
| } |
| |
| if (solaris_pending_finis != NULL && TREE_CODE (decl) == FUNCTION_DECL) |
| for (x = &solaris_pending_finis; *x; x = &TREE_CHAIN (*x)) |
| { |
| tree name = TREE_PURPOSE (*x); |
| if (DECL_NAME (decl) == name) |
| { |
| *attributes = tree_cons (get_identifier ("fini"), NULL, |
| *attributes); |
| TREE_USED (decl) = 1; |
| DECL_PRESERVE_P (decl) = 1; |
| next = TREE_CHAIN (*x); |
| ggc_free (*x); |
| *x = next; |
| break; |
| } |
| } |
| } |
| |
| /* Output initializer or finalizer entries for DECL to FILE. */ |
| |
| void |
| solaris_output_init_fini (FILE *file, tree decl) |
| { |
| if (lookup_attribute ("init", DECL_ATTRIBUTES (decl))) |
| { |
| fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".init"); |
| ASM_OUTPUT_CALL (file, decl); |
| fprintf (file, "\t.popsection\n"); |
| } |
| |
| if (lookup_attribute ("fini", DECL_ATTRIBUTES (decl))) |
| { |
| fprintf (file, "\t.pushsection\t" SECTION_NAME_FORMAT "\n", ".fini"); |
| ASM_OUTPUT_CALL (file, decl); |
| fprintf (file, "\t.popsection\n"); |
| } |
| } |
| |
| /* Emit an assembler directive to set symbol for DECL visibility to |
| the visibility type VIS, which must not be VISIBILITY_DEFAULT. */ |
| |
| void |
| solaris_assemble_visibility (tree decl, int vis ATTRIBUTE_UNUSED) |
| { |
| #ifdef HAVE_GAS_HIDDEN |
| /* Sun as uses .symbolic for STV_PROTECTED. STV_INTERNAL is marked as |
| `currently reserved', but the linker treats it like STV_HIDDEN. Sun |
| Studio 12.1 cc emits .hidden instead. |
| |
| There are 3 Sun extensions GCC doesn't yet know about: STV_EXPORTED, |
| STV_SINGLETON, and STV_ELIMINATE. |
| |
| See Linker and Libraries Guide, Ch. 2, Link-Editor, Defining |
| Additional Symbols, and Ch. 7, Object-File Format, Symbol Table |
| Section. */ |
| |
| static const char * const visibility_types[] = { |
| NULL, "symbolic", "hidden", "hidden" |
| }; |
| |
| const char *name, *type; |
| tree id = DECL_ASSEMBLER_NAME (decl); |
| |
| while (IDENTIFIER_TRANSPARENT_ALIAS (id)) |
| id = TREE_CHAIN (id); |
| name = IDENTIFIER_POINTER (id); |
| type = visibility_types[vis]; |
| |
| fprintf (asm_out_file, "\t.%s\t", type); |
| assemble_name (asm_out_file, name); |
| fprintf (asm_out_file, "\n"); |
| #else |
| if (!DECL_ARTIFICIAL (decl)) |
| warning (OPT_Wattributes, "visibility attribute not supported " |
| "in this configuration; ignored"); |
| #endif |
| } |
| |
| /* Group section information entry stored in solaris_comdat_htab. */ |
| |
| typedef struct comdat_entry |
| { |
| const char *name; |
| unsigned int flags; |
| tree decl; |
| const char *sig; |
| } comdat_entry; |
| |
| /* Helpers for maintaining solaris_comdat_htab. */ |
| |
| struct comdat_entry_hasher : nofree_ptr_hash <comdat_entry> |
| { |
| static inline hashval_t hash (const comdat_entry *); |
| static inline bool equal (const comdat_entry *, const comdat_entry *); |
| static inline void remove (comdat_entry *); |
| }; |
| |
| inline hashval_t |
| comdat_entry_hasher::hash (const comdat_entry *entry) |
| { |
| return htab_hash_string (entry->sig); |
| } |
| |
| inline bool |
| comdat_entry_hasher::equal (const comdat_entry *entry1, |
| const comdat_entry *entry2) |
| { |
| return strcmp (entry1->sig, entry2->sig) == 0; |
| } |
| |
| /* Hash table of group signature symbols. */ |
| |
| static hash_table<comdat_entry_hasher> *solaris_comdat_htab; |
| |
| /* Output assembly to switch to COMDAT group section NAME with attributes |
| FLAGS and group signature symbol DECL, using Sun as syntax. */ |
| |
| void |
| solaris_elf_asm_comdat_section (const char *name, unsigned int flags, tree decl) |
| { |
| const char *signature; |
| char *section; |
| comdat_entry entry, **slot; |
| |
| if (TREE_CODE (decl) == IDENTIFIER_NODE) |
| signature = IDENTIFIER_POINTER (decl); |
| else |
| signature = IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl)); |
| |
| /* Sun as requires group sections to be fragmented, i.e. to have names of |
| the form <section>%<fragment>. Strictly speaking this is only |
| necessary to support cc -xF, but is enforced globally in violation of |
| the ELF gABI. We keep the section names generated by GCC (generally |
| of the form .text.<signature>) and append %<signature> to pacify as, |
| despite the redundancy. */ |
| section = concat (name, "%", signature, NULL); |
| |
| /* Clear SECTION_LINKONCE flag so targetm.asm_out.named_section only |
| emits this as a regular section. Emit section before .group |
| directive since Sun as treats undeclared sections as @progbits, |
| which conflicts with .bss* sections which are @nobits. */ |
| targetm.asm_out.named_section (section, flags & ~SECTION_LINKONCE, decl); |
| |
| /* Sun as separates declaration of a group section and of the group |
| itself, using the .group directive and the #comdat flag. */ |
| fprintf (asm_out_file, "\t.group\t%s," SECTION_NAME_FORMAT ",#comdat\n", |
| signature, section); |
| |
| /* Unlike GNU as, group signature symbols need to be defined explicitly |
| for Sun as. With a few exceptions, this is already the case. To |
| identify the missing ones without changing the affected frontents, |
| remember the signature symbols and emit those not marked |
| TREE_SYMBOL_REFERENCED in solaris_file_end. */ |
| if (!solaris_comdat_htab) |
| solaris_comdat_htab = new hash_table<comdat_entry_hasher> (37); |
| |
| entry.sig = signature; |
| slot = solaris_comdat_htab->find_slot (&entry, INSERT); |
| |
| if (*slot == NULL) |
| { |
| *slot = XCNEW (comdat_entry); |
| /* Remember fragmented section name. */ |
| (*slot)->name = section; |
| /* Emit as regular section, .group declaration has already been done. */ |
| (*slot)->flags = flags & ~SECTION_LINKONCE; |
| (*slot)->decl = decl; |
| (*slot)->sig = signature; |
| } |
| } |
| |
| /* Define unreferenced COMDAT group signature symbol corresponding to SLOT. */ |
| |
| int |
| solaris_define_comdat_signature (comdat_entry **slot, |
| void *aux ATTRIBUTE_UNUSED) |
| { |
| comdat_entry *entry = *slot; |
| tree decl = entry->decl; |
| |
| if (TREE_CODE (decl) != IDENTIFIER_NODE) |
| decl = DECL_COMDAT_GROUP (decl); |
| |
| if (!TREE_SYMBOL_REFERENCED (decl)) |
| { |
| /* Switch to group section, otherwise Sun as complains |
| `Group Id symbol defined outside of group'. */ |
| switch_to_section (get_section (entry->name, entry->flags, entry->decl)); |
| |
| ASM_OUTPUT_LABEL (asm_out_file, entry->sig); |
| } |
| |
| /* Continue with scan. */ |
| return 1; |
| } |
| |
| /* Emit unreferenced COMDAT group signature symbols for Sun as. */ |
| |
| void |
| solaris_file_end (void) |
| { |
| if (!solaris_comdat_htab) |
| return; |
| |
| solaris_comdat_htab->traverse <void *, solaris_define_comdat_signature> |
| (NULL); |
| } |
| |
| void |
| solaris_override_options (void) |
| { |
| /* Older versions of Solaris ld cannot handle CIE version 3 in .eh_frame. |
| Don't emit DWARF3/4 unless specifically selected if so. */ |
| if (!HAVE_LD_EH_FRAME_CIEV3 && !global_options_set.x_dwarf_version) |
| dwarf_version = 2; |
| } |