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