merge from gcc

2 files changed, 207 insertions, 0 deletions

diff --git a/include/ChangeLog b/include/ChangeLog
index 73ccb4d..83c6738 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,7 @@
+2010-11-02  Ian Lance Taylor  <iant@google.com>
+
+	* simple-object.h: New file.
+
 2010-10-15  Dave Korn  <dave.korn.cygwin@gmail.com> 
 
 	Sync LD plugin patch series (part 1/6) with src/include/.
diff --git a/include/simple-object.h b/include/simple-object.h
new file mode 100644
index 0000000..a72e4a1
--- /dev/null
+++ b/include/simple-object.h
@@ -0,0 +1,203 @@
+/* simple-object.h -- simple routines to read and write object files
+   Copyright 2010 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor, Google.
+
+This program 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 2, or (at your option) any
+later version.
+
+This program 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 this program; if not, write to the Free Software
+Foundation, 51 Franklin Street - Fifth Floor,
+Boston, MA 02110-1301, USA.  */
+
+#ifndef SIMPLE_OBJECT_H
+#define SIMPLE_OBJECT_H
+
+#include <stddef.h>
+#include <sys/types.h>
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* This header file provides four types with associated functions.
+   They are used to read and write object files.  This is a minimal
+   interface, intended to support the needs of gcc without bringing in
+   all the power and complexity of BFD.  */
+
+/* The type simple_object_read * is used to read an existing object
+   file.  */
+
+typedef struct simple_object_read_struct simple_object_read;
+
+/* Create an simple_object_read given DESCRIPTOR, an open file
+   descriptor, and OFFSET, an offset within the file.  The offset is
+   for use with archives, and should be 0 for an ordinary object file.
+   The descriptor must remain open until done with the returned
+   simple_object_read.  SEGMENT_NAME is used on Mach-O and is required
+   on that platform: it means to only look at sections within the
+   segment with that name.  It is ignored for other object file
+   formats.  On error, this function returns NULL, and sets *ERRMSG to
+   an error string and sets *ERR to an errno value or 0 if there is no
+   relevant errno.  */
+
+extern simple_object_read *
+simple_object_start_read (int descriptor, off_t offset,
+			  const char *segment_name, const char **errmsg,
+			  int *err);
+
+/* Call PFN for each section in SIMPLE_OBJECT, passing it the section
+   name, offset within the file of the section contents, and length of
+   the section contents.  The offset within the file is relative to
+   the offset passed to simple_object_start_read.  The DATA argument
+   to simple_object_find_sections is passed on to PFN.  If PFN returns
+   0, the loop is stopped and simple_object_find_sections returns.  If
+   PFN returns non-zero, the loop continues.  On success this returns
+   NULL.  On error it returns an error string, and sets *ERR to an
+   errno value or 0 if there is no relevant errno.  */
+
+extern const char *
+simple_object_find_sections (simple_object_read *simple_object,
+			     int (*pfn) (void *data, const char *,
+					 off_t offset, off_t length),
+			     void *data,
+			     int *err);
+
+/* Look for the section NAME in SIMPLE_OBJECT.  This returns
+   information for the first section NAME in SIMPLE_OBJECT.  Note that
+   calling this multiple times is inefficient; use
+   simple_object_find_sections instead.
+
+   If found, return 1 and set *OFFSET to the offset in the file of the
+   section contents and set *LENGTH to the length of the section
+   contents.  *OFFSET will be relative to the offset passed to
+   simple_object_start_read.
+
+   If the section is not found, and no error occurs, return 0 and set
+   *ERRMSG to NULL.
+
+   If an error occurs, return 0, set *ERRMSG to an error message, and
+   set *ERR to an errno value or 0 if there is no relevant errno.  */
+
+extern int
+simple_object_find_section (simple_object_read *simple_object,
+			    const char *name, off_t *offset, off_t *length,
+			    const char **errmsg, int *err);
+
+/* Release all resources associated with SIMPLE_OBJECT.  This does not
+   close the file descriptor.  */
+
+extern void
+simple_object_release_read (simple_object_read *);
+
+/* The type simple_object_attributes holds the attributes of an object
+   file that matter for creating a file or ensuring that two files are
+   compatible.  This is a set of magic numbers.  */
+
+typedef struct simple_object_attributes_struct simple_object_attributes;
+
+/* Fetch the attributes of SIMPLE_OBJECT.  This information will
+   persist until simple_object_attributes_release is called, even if
+   SIMPLE_OBJECT is closed.  On error this returns NULL, sets *ERRMSG
+   to an error message, and sets *ERR to an errno value or 0 if there
+   isn't one.  */
+
+extern simple_object_attributes *
+simple_object_fetch_attributes (simple_object_read *simple_object,
+				const char **errmsg, int *err);
+
+/* Compare ATTRS1 and ATTRS2.  If they could be linked together
+   without error, return NULL.  Otherwise, return an error message,
+   set *ERR to an errno value or 0 if there isn't one.  */
+
+extern const char *
+simple_object_attributes_compare (simple_object_attributes *attrs1,
+			    simple_object_attributes *attrs2,
+			    int *err);
+
+/* Release all resources associated with ATTRS.  */
+
+extern void
+simple_object_release_attributes (simple_object_attributes *attrs);
+
+/* The type simple_object_write is used to create a new object file.  */
+
+typedef struct simple_object_write_struct simple_object_write;
+
+/* Start creating a new object file which is like ATTRS.  You must
+   fetch attribute information from an existing object file before you
+   can create a new one.  There is currently no support for creating
+   an object file de novo.  The segment name is only used on Mach-O,
+   where it is required.  It means that all sections are created
+   within that segment.  It is ignored for other object file formats.
+   On error this function returns NULL, sets *ERRMSG to an error
+   message, and sets *ERR to an errno value or 0 if there isn't
+   one.  */
+
+extern simple_object_write *
+simple_object_start_write (simple_object_attributes *attrs,
+			   const char *segment_name,
+			   const char **errmsg, int *err);
+
+/* The type simple_object_write_section is a handle for a section
+   which is being written.  */
+
+typedef struct simple_object_write_section_struct simple_object_write_section;
+
+/* Add a section to SIMPLE_OBJECT.  NAME is the name of the new
+   section.  ALIGN is the required alignment expressed as the number
+   of required low-order 0 bits (e.g., 2 for alignment to a 32-bit
+   boundary).  The section is created as containing data, readable,
+   not writable, not executable, not loaded at runtime.  On error this
+   returns NULL, sets *ERRMSG to an error message, and sets *ERR to an
+   errno value or 0 if there isn't one.  */
+
+extern simple_object_write_section *
+simple_object_write_create_section (simple_object_write *simple_object,
+				    const char *name, unsigned int align,
+				    const char **errmsg, int *err);
+
+/* Add data BUFFER/SIZE to SECTION in SIMPLE_OBJECT.  If COPY is
+   non-zero, the data will be copied into memory if necessary.  If
+   COPY is zero, BUFFER must persist until SIMPLE_OBJECT is released.
+   On success this returns NULL.  On error this returns an error
+   message, and sets *ERR to an errno value or 0 if there isn't
+   one.  */
+
+extern const char *
+simple_object_write_add_data (simple_object_write *simple_object,
+			      simple_object_write_section *section,
+			      const void *buffer, size_t size,
+			      int copy, int *err);
+
+/* Write the complete object file to DESCRIPTOR, an open file
+   descriptor.  This returns NULL on success.  On error this returns
+   an error message, and sets *ERR to an errno value or 0 if there
+   isn't one.  */
+
+extern const char *
+simple_object_write_to_file (simple_object_write *simple_object,
+			     int descriptor, int *err);
+
+/* Release all resources associated with SIMPLE_OBJECT, including any
+   simple_object_write_section's that may have been created.  */
+
+extern void
+simple_object_release_write (simple_object_write *);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif