#include "gdb_string.h"
#include "gdb_assert.h"
#include <sys/types.h>
-#ifdef HAVE_ZLIB_H
-#include <zlib.h>
-#endif
-#ifdef HAVE_MMAP
-#include <sys/mman.h>
-#ifndef MAP_FAILED
-#define MAP_FAILED ((void *) -1)
-#endif
-#endif
typedef struct symbol *symbolp;
DEF_VEC_P (symbolp);
/* When non-zero, do not reject deprecated .gdb_index sections. */
int use_deprecated_index_sections = 0;
-static int pagesize;
-
/* When set, the file that we're processing is known to have debugging
info for C++ namespaces. GCC 3.3.x did not produce this information,
but later versions do. */
asection *asection;
gdb_byte *buffer;
bfd_size_type size;
- /* Not NULL if the section was actually mmapped. */
- void *map_addr;
- /* Page aligned size of mmapped area. */
- bfd_size_type map_len;
/* True if we have tried to read this section. */
int readin;
};
static void free_dwo_file_cleanup (void *);
-static void munmap_section_buffer (struct dwarf2_section_info *);
-
static void process_cu_includes (void);
#if WORDS_BIGENDIAN
dwarf2_per_objfile->has_section_at_zero = 1;
}
-/* Decompress a section that was compressed using zlib. Store the
- decompressed buffer, and its size, in OUTBUF and OUTSIZE. */
-
-static void
-zlib_decompress_section (struct objfile *objfile, asection *sectp,
- gdb_byte **outbuf, bfd_size_type *outsize)
-{
- bfd *abfd = sectp->owner;
-#ifndef HAVE_ZLIB_H
- error (_("Support for zlib-compressed DWARF data (from '%s') "
- "is disabled in this copy of GDB"),
- bfd_get_filename (abfd));
-#else
- bfd_size_type compressed_size = bfd_get_section_size (sectp);
- gdb_byte *compressed_buffer = xmalloc (compressed_size);
- struct cleanup *cleanup = make_cleanup (xfree, compressed_buffer);
- bfd_size_type uncompressed_size;
- gdb_byte *uncompressed_buffer;
- z_stream strm;
- int rc;
- int header_size = 12;
-
- if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
- || bfd_bread (compressed_buffer,
- compressed_size, abfd) != compressed_size)
- error (_("Dwarf Error: Can't read DWARF data from '%s'"),
- bfd_get_filename (abfd));
-
- /* Read the zlib header. In this case, it should be "ZLIB" followed
- by the uncompressed section size, 8 bytes in big-endian order. */
- if (compressed_size < header_size
- || strncmp (compressed_buffer, "ZLIB", 4) != 0)
- error (_("Dwarf Error: Corrupt DWARF ZLIB header from '%s'"),
- bfd_get_filename (abfd));
- uncompressed_size = compressed_buffer[4]; uncompressed_size <<= 8;
- uncompressed_size += compressed_buffer[5]; uncompressed_size <<= 8;
- uncompressed_size += compressed_buffer[6]; uncompressed_size <<= 8;
- uncompressed_size += compressed_buffer[7]; uncompressed_size <<= 8;
- uncompressed_size += compressed_buffer[8]; uncompressed_size <<= 8;
- uncompressed_size += compressed_buffer[9]; uncompressed_size <<= 8;
- uncompressed_size += compressed_buffer[10]; uncompressed_size <<= 8;
- uncompressed_size += compressed_buffer[11];
-
- /* It is possible the section consists of several compressed
- buffers concatenated together, so we uncompress in a loop. */
- strm.zalloc = NULL;
- strm.zfree = NULL;
- strm.opaque = NULL;
- strm.avail_in = compressed_size - header_size;
- strm.next_in = (Bytef*) compressed_buffer + header_size;
- strm.avail_out = uncompressed_size;
- uncompressed_buffer = obstack_alloc (&objfile->objfile_obstack,
- uncompressed_size);
- rc = inflateInit (&strm);
- while (strm.avail_in > 0)
- {
- if (rc != Z_OK)
- error (_("Dwarf Error: setting up DWARF uncompression in '%s': %d"),
- bfd_get_filename (abfd), rc);
- strm.next_out = ((Bytef*) uncompressed_buffer
- + (uncompressed_size - strm.avail_out));
- rc = inflate (&strm, Z_FINISH);
- if (rc != Z_STREAM_END)
- error (_("Dwarf Error: zlib error uncompressing from '%s': %d"),
- bfd_get_filename (abfd), rc);
- rc = inflateReset (&strm);
- }
- rc = inflateEnd (&strm);
- if (rc != Z_OK
- || strm.avail_out != 0)
- error (_("Dwarf Error: concluding DWARF uncompression in '%s': %d"),
- bfd_get_filename (abfd), rc);
-
- do_cleanups (cleanup);
- *outbuf = uncompressed_buffer;
- *outsize = uncompressed_size;
-#endif
-}
-
/* A helper function that decides whether a section is empty,
or not present. */
if (info->readin)
return;
info->buffer = NULL;
- info->map_addr = NULL;
info->readin = 1;
if (dwarf2_section_empty_p (info))
return;
- /* Note that ABFD may not be from OBJFILE, e.g. a DWO section. */
abfd = sectp->owner;
- /* Check if the file has a 4-byte header indicating compression. */
- if (info->size > sizeof (header)
- && bfd_seek (abfd, sectp->filepos, SEEK_SET) == 0
- && bfd_bread (header, sizeof (header), abfd) == sizeof (header))
- {
- /* Upon decompression, update the buffer and its size. */
- if (strncmp (header, "ZLIB", sizeof (header)) == 0)
- {
- zlib_decompress_section (objfile, sectp, &info->buffer,
- &info->size);
- return;
- }
- }
-
-#ifdef HAVE_MMAP
- if (pagesize == 0)
- pagesize = getpagesize ();
-
- /* Only try to mmap sections which are large enough: we don't want to
- waste space due to fragmentation. Also, only try mmap for sections
- without relocations. */
-
- if (info->size > 4 * pagesize && (sectp->flags & SEC_RELOC) == 0)
+ /* If the section has relocations, we must read it ourselves.
+ Otherwise we attach it to the BFD. */
+ if ((sectp->flags & SEC_RELOC) == 0)
{
- info->buffer = bfd_mmap (abfd, 0, info->size, PROT_READ,
- MAP_PRIVATE, sectp->filepos,
- &info->map_addr, &info->map_len);
+ const gdb_byte *bytes = gdb_bfd_map_section (sectp, &info->size);
- if ((caddr_t)info->buffer != MAP_FAILED)
- {
-#if HAVE_POSIX_MADVISE
- posix_madvise (info->map_addr, info->map_len, POSIX_MADV_WILLNEED);
-#endif
- return;
- }
+ /* We have to cast away const here for historical reasons.
+ Fixing dwarf2read to be const-correct would be quite nice. */
+ info->buffer = (gdb_byte *) bytes;
+ return;
}
-#endif
- /* If we get here, we are a normal, not-compressed section. */
- info->buffer = buf
- = obstack_alloc (&objfile->objfile_obstack, info->size);
+ buf = obstack_alloc (&objfile->objfile_obstack, info->size);
+ info->buffer = buf;
/* When debugging .o files, we may need to apply relocations; see
http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
gdb_assert (dwo_file->dwo_bfd != objfile->obfd);
gdb_bfd_unref (dwo_file->dwo_bfd);
- munmap_section_buffer (&dwo_file->sections.abbrev);
- munmap_section_buffer (&dwo_file->sections.info);
- munmap_section_buffer (&dwo_file->sections.line);
- munmap_section_buffer (&dwo_file->sections.loc);
- munmap_section_buffer (&dwo_file->sections.str);
- munmap_section_buffer (&dwo_file->sections.str_offsets);
-
- for (ix = 0;
- VEC_iterate (dwarf2_section_info_def, dwo_file->sections.types,
- ix, section);
- ++ix)
- munmap_section_buffer (section);
-
VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
}
cmd_show_list (show_dwarf2_cmdlist, from_tty, "");
}
-/* If section described by INFO was mmapped, munmap it now. */
-
-static void
-munmap_section_buffer (struct dwarf2_section_info *info)
-{
- if (info->map_addr != NULL)
- {
-#ifdef HAVE_MMAP
- int res;
-
- res = munmap (info->map_addr, info->map_len);
- gdb_assert (res == 0);
-#else
- /* Without HAVE_MMAP, we should never be here to begin with. */
- gdb_assert_not_reached ("no mmap support");
-#endif
- }
-}
-
-/* munmap debug sections for OBJFILE, if necessary. */
+/* Free data associated with OBJFILE, if necessary. */
static void
dwarf2_per_objfile_free (struct objfile *objfile, void *d)
{
struct dwarf2_per_objfile *data = d;
int ix;
- struct dwarf2_section_info *section;
-
- /* This is sorted according to the order they're defined in to make it easier
- to keep in sync. */
- munmap_section_buffer (&data->info);
- munmap_section_buffer (&data->abbrev);
- munmap_section_buffer (&data->line);
- munmap_section_buffer (&data->loc);
- munmap_section_buffer (&data->macinfo);
- munmap_section_buffer (&data->macro);
- munmap_section_buffer (&data->str);
- munmap_section_buffer (&data->ranges);
- munmap_section_buffer (&data->addr);
- munmap_section_buffer (&data->frame);
- munmap_section_buffer (&data->eh_frame);
- munmap_section_buffer (&data->gdb_index);
-
- for (ix = 0;
- VEC_iterate (dwarf2_section_info_def, data->types, ix, section);
- ++ix)
- munmap_section_buffer (section);
for (ix = 0; ix < dwarf2_per_objfile->n_comp_units; ++ix)
VEC_free (dwarf2_per_cu_ptr,
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