2010-11-02 15:40:44 +01:00
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/* simple-object.h -- simple routines to read and write object files
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2018-01-03 11:03:58 +01:00
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Copyright (C) 2010-2018 Free Software Foundation, Inc.
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2010-11-02 15:40:44 +01:00
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Written by Ian Lance Taylor, Google.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This program 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 this program; if not, write to the Free Software
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Foundation, 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#ifndef SIMPLE_OBJECT_H
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#define SIMPLE_OBJECT_H
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#include <stddef.h>
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#include <sys/types.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* This header file provides four types with associated functions.
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They are used to read and write object files. This is a minimal
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interface, intended to support the needs of gcc without bringing in
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all the power and complexity of BFD. */
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/* The type simple_object_read * is used to read an existing object
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file. */
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typedef struct simple_object_read_struct simple_object_read;
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/* Create an simple_object_read given DESCRIPTOR, an open file
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descriptor, and OFFSET, an offset within the file. The offset is
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for use with archives, and should be 0 for an ordinary object file.
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The descriptor must remain open until done with the returned
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simple_object_read. SEGMENT_NAME is used on Mach-O and is required
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on that platform: it means to only look at sections within the
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segment with that name. It is ignored for other object file
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formats. On error, this function returns NULL, and sets *ERRMSG to
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an error string and sets *ERR to an errno value or 0 if there is no
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relevant errno. */
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extern simple_object_read *
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simple_object_start_read (int descriptor, off_t offset,
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const char *segment_name, const char **errmsg,
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int *err);
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/* Call PFN for each section in SIMPLE_OBJECT, passing it the section
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name, offset within the file of the section contents, and length of
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the section contents. The offset within the file is relative to
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the offset passed to simple_object_start_read. The DATA argument
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to simple_object_find_sections is passed on to PFN. If PFN returns
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0, the loop is stopped and simple_object_find_sections returns. If
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PFN returns non-zero, the loop continues. On success this returns
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NULL. On error it returns an error string, and sets *ERR to an
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errno value or 0 if there is no relevant errno. */
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extern const char *
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simple_object_find_sections (simple_object_read *simple_object,
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int (*pfn) (void *data, const char *,
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off_t offset, off_t length),
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void *data,
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int *err);
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/* Look for the section NAME in SIMPLE_OBJECT. This returns
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information for the first section NAME in SIMPLE_OBJECT. Note that
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calling this multiple times is inefficient; use
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simple_object_find_sections instead.
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If found, return 1 and set *OFFSET to the offset in the file of the
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section contents and set *LENGTH to the length of the section
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contents. *OFFSET will be relative to the offset passed to
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simple_object_start_read.
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If the section is not found, and no error occurs, return 0 and set
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*ERRMSG to NULL.
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If an error occurs, return 0, set *ERRMSG to an error message, and
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set *ERR to an errno value or 0 if there is no relevant errno. */
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extern int
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simple_object_find_section (simple_object_read *simple_object,
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const char *name, off_t *offset, off_t *length,
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const char **errmsg, int *err);
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/* Release all resources associated with SIMPLE_OBJECT. This does not
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close the file descriptor. */
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extern void
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simple_object_release_read (simple_object_read *);
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/* The type simple_object_attributes holds the attributes of an object
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file that matter for creating a file or ensuring that two files are
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compatible. This is a set of magic numbers. */
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typedef struct simple_object_attributes_struct simple_object_attributes;
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/* Fetch the attributes of SIMPLE_OBJECT. This information will
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persist until simple_object_attributes_release is called, even if
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SIMPLE_OBJECT is closed. On error this returns NULL, sets *ERRMSG
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to an error message, and sets *ERR to an errno value or 0 if there
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isn't one. */
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extern simple_object_attributes *
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simple_object_fetch_attributes (simple_object_read *simple_object,
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const char **errmsg, int *err);
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2010-11-17 02:03:06 +01:00
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/* Merge the FROM attributes into TO. If two objects with these
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attributes could be linked together without error, returns NULL.
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Otherwise, returns an error message, and sets *ERR to an errno
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value or 0 if there isn't one. */
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2010-11-02 15:40:44 +01:00
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extern const char *
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2010-11-17 02:03:06 +01:00
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simple_object_attributes_merge (simple_object_attributes *to,
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simple_object_attributes *from,
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int *err);
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/* Release all resources associated with ATTRS. */
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extern void
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simple_object_release_attributes (simple_object_attributes *attrs);
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/* The type simple_object_write is used to create a new object file. */
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typedef struct simple_object_write_struct simple_object_write;
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/* Start creating a new object file which is like ATTRS. You must
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fetch attribute information from an existing object file before you
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can create a new one. There is currently no support for creating
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an object file de novo. The segment name is only used on Mach-O,
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where it is required. It means that all sections are created
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within that segment. It is ignored for other object file formats.
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On error this function returns NULL, sets *ERRMSG to an error
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message, and sets *ERR to an errno value or 0 if there isn't
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one. */
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extern simple_object_write *
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simple_object_start_write (simple_object_attributes *attrs,
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const char *segment_name,
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const char **errmsg, int *err);
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/* The type simple_object_write_section is a handle for a section
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which is being written. */
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typedef struct simple_object_write_section_struct simple_object_write_section;
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/* Add a section to SIMPLE_OBJECT. NAME is the name of the new
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section. ALIGN is the required alignment expressed as the number
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of required low-order 0 bits (e.g., 2 for alignment to a 32-bit
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boundary). The section is created as containing data, readable,
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not writable, not executable, not loaded at runtime. On error this
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returns NULL, sets *ERRMSG to an error message, and sets *ERR to an
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errno value or 0 if there isn't one. */
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extern simple_object_write_section *
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simple_object_write_create_section (simple_object_write *simple_object,
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const char *name, unsigned int align,
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const char **errmsg, int *err);
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/* Add data BUFFER/SIZE to SECTION in SIMPLE_OBJECT. If COPY is
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non-zero, the data will be copied into memory if necessary. If
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COPY is zero, BUFFER must persist until SIMPLE_OBJECT is released.
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On success this returns NULL. On error this returns an error
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message, and sets *ERR to an errno value or 0 if there isn't
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one. */
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extern const char *
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simple_object_write_add_data (simple_object_write *simple_object,
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simple_object_write_section *section,
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const void *buffer, size_t size,
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int copy, int *err);
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/* Write the complete object file to DESCRIPTOR, an open file
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descriptor. This returns NULL on success. On error this returns
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an error message, and sets *ERR to an errno value or 0 if there
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isn't one. */
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extern const char *
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simple_object_write_to_file (simple_object_write *simple_object,
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int descriptor, int *err);
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/* Release all resources associated with SIMPLE_OBJECT, including any
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simple_object_write_section's that may have been created. */
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extern void
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simple_object_release_write (simple_object_write *);
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re PR go/78628 (GO fails to build a translation unit decl)
2017-08-21 Richard Biener <rguenther@suse.de>
include/
* simple-object.h (simple_object_copy_lto_debug_sections): New
function.
libiberty/
* simple-object-common.h (struct simple_object_functions): Add
copy_lto_debug_sections hook.
* simple-object.c: Include fcntl.h.
(handle_lto_debug_sections): New helper function.
(simple_object_copy_lto_debug_sections): New function copying
early LTO debug sections to regular debug sections in a new file.
(simple_object_start_write): Handle NULL segment_name.
* simple-object-coff.c (simple_object_coff_functions): Adjust
for not implemented copy_lto_debug_sections hook.
* simple-object-mach-o.c (simple_object_mach_o_functions): Likewise.
* simple-object-xcoff.c (simple_object_xcoff_functions): Likewise.
* simple-object-elf.c (SHT_NULL, SHT_SYMTAB, SHT_RELA, SHT_REL,
SHT_GROUP): Add various sectopn header types.
(SHF_EXCLUDE): Add flag.
(Elf32_External_Sym, Elf64_External_Sym): Add symbol struct.
(ELF_ST_BIND, ELF_ST_TYPE, ELF_ST_INFO): Add accessors.
(STT_OBJECT, STT_FUNC, STT_TLS, STT_GNU_IFUNC): Add Symbol types.
(STV_DEFAULT): Add symbol visibility.
(SHN_COMMON): Add special section index name.
(struct simple_object_elf_write): New.
(simple_object_elf_start_write): Adjust for new private data.
(simple_object_elf_write_shdr): Pass in values for all fields
we write.
(simple_object_elf_write_to_file): Adjust. Copy from recorded
section headers if requested.
(simple_object_elf_release_write): Release private data.
(simple_object_elf_copy_lto_debug_sections): Copy and rename sections
as denoted by PFN and all their dependences, symbols and relocations
to the empty destination file.
(simple_object_elf_functions): Adjust for copy_lto_debug_sections hook.
gcc/
* debug.h (struct gcc_debug_hooks): Add die_ref_for_decl and
register_external_die hooks.
(debug_false_tree_charstarstar_uhwistar): Declare.
(debug_nothing_tree_charstar_uhwi): Likewise.
* debug.c (do_nothing_debug_hooks): Adjust.
(debug_false_tree_charstarstar_uhwistar): New do nothing.
(debug_nothing_tree_charstar_uhwi): Likewise.
* dbxout.c (dbx_debug_hooks): Adjust.
(xcoff_debug_hooks): Likewise.
* sdbout.c (sdb_debug_hooks): Likewise.
* vmsdbgout.c (vmsdbg_debug_hooks): Likewise.
* dwarf2out.c (macinfo_label_base): New global.
(dwarf2out_register_external_die): New function for the
register_external_die hook.
(dwarf2out_die_ref_for_decl): Likewise for die_ref_for_decl.
(dwarf2_debug_hooks): Use them.
(dwarf2_lineno_debug_hooks): Adjust.
(struct die_struct): Add with_offset flag.
(DEBUG_LTO_DWO_INFO_SECTION, DEBUG_LTO_INFO_SECTION,
DEBUG_LTO_DWO_ABBREV_SECTION, DEBUG_LTO_ABBREV_SECTION,
DEBUG_LTO_DWO_MACINFO_SECTION, DEBUG_LTO_MACINFO_SECTION,
DEBUG_LTO_DWO_MACRO_SECTION, DEBUG_LTO_MACRO_SECTION,
DEBUG_LTO_LINE_SECTION, DEBUG_LTO_DWO_STR_OFFSETS_SECTION,
DEBUG_LTO_STR_DWO_SECTION, DEBUG_STR_LTO_SECTION): New macros
defining section names for the early LTO debug variants.
(reset_indirect_string): New helper.
(add_AT_external_die_ref): Helper for dwarf2out_register_external_die.
(print_dw_val): Add support for offsetted symbol references.
(get_ultimate_context): Split out from is_cxx.
(is_cxx): Use get_ultimate_context.
(is_fortran): Add decl overload.
(compute_comp_unit_symbol): Split out worker from
compute_section_prefix.
(compute_section_prefix): Call compute_comp_unit_symbol and
set comdat_type_p here.
(output_die): Skip DIE symbol output for the LTO added one.
Handle DIE symbol references with offset.
(output_comp_unit): Guard section name mangling properly.
For LTO debug sections emit a symbol at the section beginning
which we use to refer to its DIEs.
(add_abstract_origin_attribute): For DIEs registered via
dwarf2out_register_external_die directly refer to the early
DIE rather than indirectly through the shadow one we created.
Remove obsolete call to dwarf2out_abstract_function for
non-function/block origins.
(gen_array_type_die): When generating early LTO debug do
not emit DW_AT_string_length.
(gen_formal_parameter_die): Do not re-create DIEs for PARM_DECLs
late when in LTO. As suggested place a gcc_unreachable for
the DECL_ABSTRACT_P case.
(gen_subprogram_die): Avoid another specification DIE
for early built declarations/definitions for the late LTO case.
(gen_variable_die): Add type references for late duplicated VLA dies
when in late LTO.
(gen_inlined_subroutine_die): Do not call dwarf2out_abstract_function,
we have the abstract instance already.
(process_scope_var): Adjust decl DIE contexts in LTO which
first puts them in limbo.
(gen_decl_die): Do not generate type DIEs late apart from
types for VLAs or for decls we do not yet have a DIE. Do not
call dwarf2out_abstract_function late.
(dwarf2out_early_global_decl): Make sure to create DIEs
for abstract instances of a decl first.
(dwarf2out_late_global_decl): Adjust comment.
(output_macinfo_op): With multiple macro sections use
macinfo_label_base to distinguish labels.
(output_macinfo): Likewise. Update macinfo_label_base.
Pass in the line info label.
(note_variable_value_in_expr): When generating LTO resolve
all variable values here by generating DIEs as needed.
(init_sections_and_labels): Add early LTO debug flag parameter
and generate different sections and names if set. Add generation
counter for the labels so we can have multiple of them.
(reset_dies): Helper to allow DIEs to be output multiple times.
(dwarf2out_finish): When outputting DIEs to the fat part of an
LTO object first reset DIEs.
(dwarf2out_early_finish): Output early DIEs when generating LTO.
(modified_type_die): Check for decl_ultimate_origin being self
before recursing.
(gen_type_die_with_usage): Likewise.
(gen_typedef_die): Allow decl_ultimate_origin being self.
(set_decl_abstract_flags): Remove.
(set_block_abstract_flags): Likewise.
(dwarf2out_abstract_function): Treat the early generated DIEs
as the abstract copy and only add DW_AT_inline and
DW_AT_artificial here and call set_decl_origin_self.
If the DIE has an abstract origin don't do anything.
* tree.c (free_lang_data): Build a dummy TRANSLATION_UNIT_DECL
if we have none yet (Go fails to build one, PR78628).
(variably_modified_type_p): Prevent endless recursion for Ada
cyclic pointer types.
* lto-streamer-in.c: Include debug.h.
(dref_queue): New global.
(lto_read_tree_1): Stream in DIE references.
(lto_input_tree): Register DIE references.
(input_function): Stream DECL_DEBUG_ARGS.
* lto-streamer-out.c: Include debug.h.
(lto_write_tree_1): Output DIE references.
(DFS::DFS_write_tree_body): Follow DECL_ABSTRACT_ORIGIN.
Force a TRANSLATION_UNIT_DECL DECL_CONTEXT for file-scope decls.
(output_function): Stream DECL_DEBUG_ARGS.
* tree-streamer-in.c (lto_input_ts_decl_common_tree_pointers):
Stream DECL_ABSTRACT_ORIGIN.
* tree-streamer-out.c (write_ts_decl_common_tree_pointers): Likewise.
(write_ts_decl_minimal_tree_pointers): Force a TRANSLATION_UNIT_DECL
DECL_CONTEXT for file-scope decls.
* lto-streamer.h (struct dref_entry): Declare.
(dref_queue): Likewise.
* cfgexpand.c (pass_expand::execute): Do not call the
outlining_inline_function hook here.
* lto-wrapper.c (debug_obj): New global.
(tool_cleanup): Unlink it if required.
(debug_objcopy): New function.
(run_gcc): Handle early debug sections in the IL files by
extracting them to separate files, partially linkin them and
feeding the result back as result to the linker.
* config/darwin.h (DEBUG_LTO_INFO_SECTION, DEBUG_LTO_ABBREV_SECTION,
DEBUG_LTO_MACINFO_SECTION, DEBUG_LTO_LINE_SECTION,
DEBUG_STR_LTO_SECTION, DEBUG_LTO_MACRO_SECTION): Put early debug
sections into a separate segment.
* config/darwin.c (darwin_asm_named_section): Handle __GNU_DWARF_LTO
segments.
(darwin_asm_dwarf_section): Likewise.
(darwin_asm_output_dwarf_offset): Likewise.
* config/i386/i386.c (make_resolver_func): Set DECL_IGNORED_P.
lto/
* lto.c (unify_scc): Truncate DIE reference queue for dropped SCCs.
(lto_read_decls): Process TRANSLATION_UNIT_DECLs. Remove
TYPE_DECL debug processing, register DIE references from
prevailing SCCs with the debug machinery.
(lto_section_with_id): Handle LTO debug sections.
libstdc++/
* testsuite/libstdc++-prettyprinters/prettyprinters.exp: Run all
tests with -flto as well if supported.
testsuite/
* c-c++-common/asan/global-overflow-1.c: Adjust diagnostic location
regex to handle the LTO case.
* c-c++-common/asan/heap-overflow-1.c: Likewise.
* c-c++-common/asan/misalign-1.c: Likewise.
* c-c++-common/asan/misalign-2.c: Likewise.
* c-c++-common/asan/null-deref-1.c: Likewise.
* c-c++-common/asan/stack-overflow-1.c: Likewise.
* c-c++-common/asan/strncpy-overflow-1.c: Likewise.
* c-c++-common/asan/use-after-free-1.c: Likewise.
* c-c++-common/asan/alloca_big_alignment.c: Likewise.
* c-c++-common/asan/alloca_detect_custom_size.c: Likewise.
* c-c++-common/asan/alloca_overflow_partial.c: Likewise.
* c-c++-common/asan/alloca_overflow_right.c: Likewise.
* c-c++-common/asan/alloca_underflow_left.c: Likewise.
* g++.dg/asan/large-func-test-1.C: Likewise.
* gfortran.dg/save_6.f90: Add -flto -g variant of save_5.f90.
From-SVN: r251220
2017-08-21 12:29:00 +02:00
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/* Copy LTO debug sections from SRC_OBJECT to DEST.
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If an error occurs, return the errno value in ERR and an error string. */
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extern const char *
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simple_object_copy_lto_debug_sections (simple_object_read *src_object,
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const char *dest,
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int *err);
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2010-11-02 15:40:44 +01:00
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#ifdef __cplusplus
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}
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#endif
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#endif
|