merge from gcc

1 files changed, 355 insertions, 0 deletions

diff --git a/libiberty/simple-object-common.h b/libiberty/simple-object-common.h
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+/* simple-object-common.h -- common structs for object file manipulation.
+   Copyright (C) 2010 Free Software Foundation, Inc.
+
+This file is part of the libiberty library.
+Libiberty is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+Libiberty 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with libiberty; see the file COPYING.LIB.  If not,
+write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
+Boston, MA 02110-1301, USA.  */
+
+/* Forward reference.  */
+struct simple_object_functions;
+
+/* An object file opened for reading.  */
+
+struct simple_object_read_struct
+{
+  /* The file descriptor.  */
+  int descriptor;
+  /* The offset within the file.  */
+  off_t offset;
+  /* The functions which do the actual work.  */
+  const struct simple_object_functions *functions;
+  /* Private data for the object file format.  */
+  void *data;
+};
+
+/* Object file attributes.  */
+
+struct simple_object_attributes_struct
+{
+  /* The functions which do the actual work.  */
+  const struct simple_object_functions *functions;
+  /* Private data for the object file format.  */
+  void *data;
+};
+
+/* An object file being created.  */
+
+struct simple_object_write_struct
+{
+  /* The functions which do the actual work.  */
+  const struct simple_object_functions *functions;
+  /* The segment_name argument from the user.  */
+  char *segment_name;
+  /* The start of the list of sections.  */
+  simple_object_write_section *sections;
+  /* The last entry in the list of sections.  */
+  simple_object_write_section *last_section;
+  /* Private data for the object file format.  */
+  void *data;
+};
+
+/* A section in an object file being created.  */
+
+struct simple_object_write_section_struct
+{
+  /* Next in the list of sections attached to an
+     simple_object_write.  */
+  simple_object_write_section *next;
+  /* The name of this section.  */
+  char *name;
+  /* The required alignment.  */
+  unsigned int align;
+  /* The first data attached to this section.  */
+  struct simple_object_write_section_buffer *buffers;
+  /* The last data attached to this section.  */
+  struct simple_object_write_section_buffer *last_buffer;
+};
+
+/* Data attached to a section.  */
+
+struct simple_object_write_section_buffer
+{
+  /* The next data for this section.  */
+  struct simple_object_write_section_buffer *next;
+  /* The size of the buffer.  */
+  size_t size;
+  /* The actual bytes.  */
+  const void *buffer;
+  /* A buffer to free, or NULL.  */
+  void *free_buffer;
+};
+
+/* The number of bytes we read from the start of the file to pass to
+   the match function.  */
+#define SIMPLE_OBJECT_MATCH_HEADER_LEN (16)
+
+/* Format-specific object file functions.  */
+
+struct simple_object_functions
+{
+  /* If this file matches these functions, return a new value for the
+     private data for an simple_object_read.  HEADER is the first 16
+     bytes of the file.  DESCRIPTOR, OFFSET, SEGMENT_NAME, ERRMSG, and
+     ERR are as for simple_object_open_read.  If this file does not
+     match, this function should return NULL with *ERRMSG set to
+     NULL.  */
+  void *(*match) (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN],
+		  int descriptor, off_t offset, const char *segment_name,
+		  const char **errmsg, int *err);
+
+  /* Implement simple_object_find_sections.  */
+  const char *(*find_sections) (simple_object_read *,
+				int (*pfn) (void *, const char *,
+					    off_t offset, off_t length),
+				void *data,
+				int *err);
+
+  /* Return the private data for the attributes for SOBJ.  */
+  void *(*fetch_attributes) (simple_object_read *sobj, const char **errmsg,
+			     int *err);
+
+  /* Release the private data for an simple_object_read.  */
+  void (*release_read) (void *);
+
+  /* Compare the private data for the attributes of two files.  If
+     they are the same, in the sense that they could be linked
+     together, return NULL.  Otherwise return an error message.  */
+  const char *(*attributes_compare) (void *, void *, int *err);
+
+  /* Release the private data for an simple_object_attributes.  */
+  void (*release_attributes) (void *);
+
+  /* Start creating an object file.  */
+  void *(*start_write) (void *attributes_data, const char **errmsg,
+			int *err);
+
+  /* Write the complete object file.  */
+  const char *(*write_to_file) (simple_object_write *sobj, int descriptor,
+				int *err);
+
+  /* Release the private data for an simple_object_write.  */
+  void (*release_write) (void *);
+};
+
+/* The known object file formats.  */
+
+extern const struct simple_object_functions simple_object_coff_functions;
+extern const struct simple_object_functions simple_object_elf_functions;
+extern const struct simple_object_functions simple_object_mach_o_functions;
+
+/* Read SIZE bytes from DESCRIPTOR at file offset OFFSET into BUFFER.
+   Return non-zero on success.  On failure return 0 and set *ERRMSG
+   and *ERR.  */
+
+extern int
+simple_object_internal_read (int descriptor, off_t offset,
+			     unsigned char *buffer, size_t size,
+			     const char **errmsg, int *err);
+
+/* Write SIZE bytes from BUFFER to DESCRIPTOR at file offset OFFSET.
+   Return non-zero on success.  On failure return 0 and set *ERRMSG
+   and *ERR.  */
+
+extern int
+simple_object_internal_write (int descriptor, off_t offset,
+			      const unsigned char *buffer, size_t size,
+			      const char **errmsg, int *err);
+
+/* Define ulong_type as an unsigned 64-bit type if available.
+   Otherwise just make it unsigned long.  */
+
+#ifdef UNSIGNED_64BIT_TYPE
+__extension__ typedef UNSIGNED_64BIT_TYPE ulong_type;
+#else
+typedef unsigned long ulong_type;
+#endif
+
+/* Fetch a big-endian 16-bit value.  */
+
+static inline unsigned short
+simple_object_fetch_big_16 (const unsigned char *buf)
+{
+  return ((unsigned short) buf[0] << 8) | (unsigned short) buf[1];
+}
+
+/* Fetch a little-endian 16-bit value.  */
+
+static inline unsigned short
+simple_object_fetch_little_16 (const unsigned char *buf)
+{
+  return ((unsigned short) buf[1] << 8) | (unsigned short) buf[0];
+}
+
+/* Fetch a big-endian 32-bit value.  */
+
+static inline unsigned int
+simple_object_fetch_big_32 (const unsigned char *buf)
+{
+  return (((unsigned int) buf[0] << 24)
+	  | ((unsigned int) buf[1] << 16)
+	  | ((unsigned int) buf[2] << 8)
+	  | (unsigned int) buf[3]);
+}
+
+/* Fetch a little-endian 32-bit value.  */
+
+static inline unsigned int
+simple_object_fetch_little_32 (const unsigned char *buf)
+{
+  return (((unsigned int) buf[3] << 24)
+	  | ((unsigned int) buf[2] << 16)
+	  | ((unsigned int) buf[1] << 8)
+	  | (unsigned int) buf[0]);
+}
+
+/* Fetch a big-endian 32-bit value as a ulong_type.  */
+
+static inline ulong_type
+simple_object_fetch_big_32_ulong (const unsigned char *buf)
+{
+  return (ulong_type) simple_object_fetch_big_32 (buf);
+}
+
+/* Fetch a little-endian 32-bit value as a ulong_type.  */
+
+static inline ulong_type
+simple_object_fetch_little_32_ulong (const unsigned char *buf)
+{
+  return (ulong_type) simple_object_fetch_little_32 (buf);
+}
+
+#ifdef UNSIGNED_64BIT_TYPE
+
+/* Fetch a big-endian 64-bit value.  */
+
+static inline ulong_type
+simple_object_fetch_big_64 (const unsigned char *buf)
+{
+  return (((ulong_type) buf[0] << 56)
+	  | ((ulong_type) buf[1] << 48)
+	  | ((ulong_type) buf[2] << 40)
+	  | ((ulong_type) buf[3] << 32)
+	  | ((ulong_type) buf[4] << 24)
+	  | ((ulong_type) buf[5] << 16)
+	  | ((ulong_type) buf[6] << 8)
+	  | (ulong_type) buf[7]);
+}
+
+/* Fetch a little-endian 64-bit value.  */
+
+static inline ulong_type
+simple_object_fetch_little_64 (const unsigned char *buf)
+{
+  return (((ulong_type) buf[7] << 56)
+	  | ((ulong_type) buf[6] << 48)
+	  | ((ulong_type) buf[5] << 40)
+	  | ((ulong_type) buf[4] << 32)
+	  | ((ulong_type) buf[3] << 24)
+	  | ((ulong_type) buf[2] << 16)
+	  | ((ulong_type) buf[1] << 8)
+	  | (ulong_type) buf[0]);
+}
+
+#endif
+
+/* Store a big-endian 16-bit value.  */
+
+static inline void
+simple_object_set_big_16 (unsigned char *buf, unsigned short val)
+{
+  buf[0] = (val >> 8) & 0xff;
+  buf[1] = val & 0xff;
+}
+
+/* Store a little-endian 16-bit value.  */
+
+static inline void
+simple_object_set_little_16 (unsigned char *buf, unsigned short val)
+{
+  buf[1] = (val >> 8) & 0xff;
+  buf[0] = val & 0xff;
+}
+
+/* Store a big-endian 32-bit value.  */
+
+static inline void
+simple_object_set_big_32 (unsigned char *buf, unsigned int val)
+{
+  buf[0] = (val >> 24) & 0xff;
+  buf[1] = (val >> 16) & 0xff;
+  buf[2] = (val >> 8) & 0xff;
+  buf[3] = val & 0xff;
+}
+
+/* Store a little-endian 32-bit value.  */
+
+static inline void
+simple_object_set_little_32 (unsigned char *buf, unsigned int val)
+{
+  buf[3] = (val >> 24) & 0xff;
+  buf[2] = (val >> 16) & 0xff;
+  buf[1] = (val >> 8) & 0xff;
+  buf[0] = val & 0xff;
+}
+
+/* Store a big-endian 32-bit value coming in as a ulong_type.  */
+
+static inline void
+simple_object_set_big_32_ulong (unsigned char *buf, ulong_type val)
+{
+  simple_object_set_big_32 (buf, val);
+}
+
+/* Store a little-endian 32-bit value coming in as a ulong_type.  */
+
+static inline void
+simple_object_set_little_32_ulong (unsigned char *buf, ulong_type val)
+{
+  simple_object_set_little_32 (buf, val);
+}
+
+#ifdef UNSIGNED_64BIT_TYPE
+
+/* Store a big-endian 64-bit value.  */
+
+static inline void
+simple_object_set_big_64 (unsigned char *buf, ulong_type val)
+{
+  buf[0] = (val >> 56) & 0xff;
+  buf[1] = (val >> 48) & 0xff;
+  buf[2] = (val >> 40) & 0xff;
+  buf[3] = (val >> 32) & 0xff;
+  buf[4] = (val >> 24) & 0xff;
+  buf[5] = (val >> 16) & 0xff;
+  buf[6] = (val >> 8) & 0xff;
+  buf[7] = val & 0xff;
+}
+
+/* Store a little-endian 64-bit value.  */
+
+static inline void
+simple_object_set_little_64 (unsigned char *buf, ulong_type val)
+{
+  buf[7] = (val >> 56) & 0xff;
+  buf[6] = (val >> 48) & 0xff;
+  buf[5] = (val >> 40) & 0xff;
+  buf[4] = (val >> 32) & 0xff;
+  buf[3] = (val >> 24) & 0xff;
+  buf[2] = (val >> 16) & 0xff;
+  buf[1] = (val >> 8) & 0xff;
+  buf[0] = val & 0xff;
+}
+
+#endif