* symfile.h (struct dwarf2_debug_sections) <macro>: New field.
authorTom Tromey <tromey@redhat.com>
Tue, 26 Jul 2011 17:04:23 +0000 (17:04 +0000)
committerTom Tromey <tromey@redhat.com>
Tue, 26 Jul 2011 17:04:23 +0000 (17:04 +0000)
* dwarf2read.c (read_indirect_string_at_offset): New function.
(read_indirect_string): Use it.
(dwarf_decode_macro_bytes): New function, taken from
dwarf_decode_macros.  Handle DW_MACRO_GNU_*.
(dwarf_decode_macros): Use it.  handle DW_MACRO_GNU_*.
(dwarf_parse_macro_header, skip_form_bytes, skip_unknown_opcode):
New functions.
(struct dwarf2_per_objfile) <macro>: New field.
(dwarf2_elf_names): Add .debug_macro.
(dwarf2_macros_too_long_complaint): Add 'section' argument.
(dwarf2_locate_sections): Handle new section.
(read_file_scope): Handle DW_AT_GNU_macros.
(dwarf2_per_objfile_free): Unmap the .debug_macro section.

gdb/ChangeLog
gdb/dwarf2read.c
gdb/symfile.h

index 207acdc54a2a9688504271f0a47390fd53434b52..6bc5e4b9355b1f16bbd7797735325ed413201c6a 100644 (file)
@@ -1,3 +1,20 @@
+2011-07-26  Tom Tromey  <tromey@redhat.com>
+
+       * symfile.h (struct dwarf2_debug_sections) <macro>: New field.
+       * dwarf2read.c (read_indirect_string_at_offset): New function.
+       (read_indirect_string): Use it.
+       (dwarf_decode_macro_bytes): New function, taken from
+       dwarf_decode_macros.  Handle DW_MACRO_GNU_*.
+       (dwarf_decode_macros): Use it.  handle DW_MACRO_GNU_*.
+       (dwarf_parse_macro_header, skip_form_bytes, skip_unknown_opcode):
+       New functions.
+       (struct dwarf2_per_objfile) <macro>: New field.
+       (dwarf2_elf_names): Add .debug_macro.
+       (dwarf2_macros_too_long_complaint): Add 'section' argument.
+       (dwarf2_locate_sections): Handle new section.
+       (read_file_scope): Handle DW_AT_GNU_macros.
+       (dwarf2_per_objfile_free): Unmap the .debug_macro section.
+
 2011-07-26  Paul Pluzhnikov  <ppluzhnikov@google.com>
 
        * NEWS: Mention dcache configuration.
index 64325cbc2f5d51625e2114a087f7db4ee9aea293..505f5768fd76690ca55a7441a6883cb14cfe3e7f 100644 (file)
@@ -187,6 +187,7 @@ struct dwarf2_per_objfile
   struct dwarf2_section_info line;
   struct dwarf2_section_info loc;
   struct dwarf2_section_info macinfo;
+  struct dwarf2_section_info macro;
   struct dwarf2_section_info str;
   struct dwarf2_section_info ranges;
   struct dwarf2_section_info frame;
@@ -264,6 +265,7 @@ static const struct dwarf2_debug_sections dwarf2_elf_names = {
   { ".debug_line", ".zdebug_line" },
   { ".debug_loc", ".zdebug_loc" },
   { ".debug_macinfo", ".zdebug_macinfo" },
+  { ".debug_macro", ".zdebug_macro" },
   { ".debug_str", ".zdebug_str" },
   { ".debug_ranges", ".zdebug_ranges" },
   { ".debug_types", ".zdebug_types" },
@@ -858,10 +860,11 @@ dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
 }
 
 static void
-dwarf2_macros_too_long_complaint (void)
+dwarf2_macros_too_long_complaint (struct dwarf2_section_info *section)
 {
   complaint (&symfile_complaints,
-            _("macro info runs off end of `.debug_macinfo' section"));
+            _("macro info runs off end of `%s' section"),
+            section->asection->name);
 }
 
 static void
@@ -1233,7 +1236,9 @@ static void add_to_cu_func_list (const char *, CORE_ADDR, CORE_ADDR,
                                 struct dwarf2_cu *);
 
 static void dwarf_decode_macros (struct line_header *, unsigned int,
-                                 char *, bfd *, struct dwarf2_cu *);
+                                 char *, bfd *, struct dwarf2_cu *,
+                                struct dwarf2_section_info *,
+                                int);
 
 static int attr_form_is_block (struct attribute *);
 
@@ -1438,6 +1443,11 @@ dwarf2_locate_sections (bfd *abfd, asection *sectp, void *vnames)
       dwarf2_per_objfile->macinfo.asection = sectp;
       dwarf2_per_objfile->macinfo.size = bfd_get_section_size (sectp);
     }
+  else if (section_is_p (sectp->name, &names->macro))
+    {
+      dwarf2_per_objfile->macro.asection = sectp;
+      dwarf2_per_objfile->macro.size = bfd_get_section_size (sectp);
+    }
   else if (section_is_p (sectp->name, &names->str))
     {
       dwarf2_per_objfile->str.asection = sectp;
@@ -5641,13 +5651,28 @@ read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
      refers to information in the line number info statement program
      header, so we can only read it if we've read the header
      successfully.  */
-  attr = dwarf2_attr (die, DW_AT_macro_info, cu);
+  attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
   if (attr && cu->line_header)
     {
-      unsigned int macro_offset = DW_UNSND (attr);
+      if (dwarf2_attr (die, DW_AT_macro_info, cu))
+       complaint (&symfile_complaints,
+                  _("CU refers to both DW_AT_GNU_macros and DW_AT_macro_info"));
+
+      dwarf_decode_macros (cu->line_header, DW_UNSND (attr),
+                          comp_dir, abfd, cu,
+                          &dwarf2_per_objfile->macro, 1);
+    }
+  else
+    {
+      attr = dwarf2_attr (die, DW_AT_macro_info, cu);
+      if (attr && cu->line_header)
+       {
+         unsigned int macro_offset = DW_UNSND (attr);
 
-      dwarf_decode_macros (cu->line_header, macro_offset,
-                           comp_dir, abfd, cu);
+         dwarf_decode_macros (cu->line_header, macro_offset,
+                              comp_dir, abfd, cu,
+                              &dwarf2_per_objfile->macinfo, 0);
+       }
     }
   do_cleanups (back_to);
 }
@@ -10262,32 +10287,32 @@ read_direct_string (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr)
 }
 
 static char *
-read_indirect_string (bfd *abfd, gdb_byte *buf,
-                     const struct comp_unit_head *cu_header,
-                     unsigned int *bytes_read_ptr)
+read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
 {
-  LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
-
   dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str);
   if (dwarf2_per_objfile->str.buffer == NULL)
-    {
-      error (_("DW_FORM_strp used without .debug_str section [in module %s]"),
-                     bfd_get_filename (abfd));
-      return NULL;
-    }
+    error (_("DW_FORM_strp used without .debug_str section [in module %s]"),
+          bfd_get_filename (abfd));
   if (str_offset >= dwarf2_per_objfile->str.size)
-    {
-      error (_("DW_FORM_strp pointing outside of "
-              ".debug_str section [in module %s]"),
-            bfd_get_filename (abfd));
-      return NULL;
-    }
+    error (_("DW_FORM_strp pointing outside of "
+            ".debug_str section [in module %s]"),
+          bfd_get_filename (abfd));
   gdb_assert (HOST_CHAR_BIT == 8);
   if (dwarf2_per_objfile->str.buffer[str_offset] == '\0')
     return NULL;
   return (char *) (dwarf2_per_objfile->str.buffer + str_offset);
 }
 
+static char *
+read_indirect_string (bfd *abfd, gdb_byte *buf,
+                     const struct comp_unit_head *cu_header,
+                     unsigned int *bytes_read_ptr)
+{
+  LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
+
+  return read_indirect_string_at_offset (abfd, str_offset);
+}
+
 static unsigned long
 read_unsigned_leb128 (bfd *abfd, gdb_byte *buf, unsigned int *bytes_read_ptr)
 {
@@ -14669,117 +14694,205 @@ parse_macro_definition (struct macro_source_file *file, int line,
     dwarf2_macro_malformed_definition_complaint (body);
 }
 
+/* Skip some bytes from BYTES according to the form given in FORM.
+   Returns the new pointer.  */
 
-static void
-dwarf_decode_macros (struct line_header *lh, unsigned int offset,
-                     char *comp_dir, bfd *abfd,
-                     struct dwarf2_cu *cu)
+static gdb_byte *
+skip_form_bytes (bfd *abfd, gdb_byte *bytes,
+                enum dwarf_form form,
+                unsigned int offset_size,
+                struct dwarf2_section_info *section)
 {
-  gdb_byte *mac_ptr, *mac_end;
-  struct macro_source_file *current_file = 0;
-  enum dwarf_macinfo_record_type macinfo_type;
-  int at_commandline;
+  unsigned int bytes_read;
 
-  dwarf2_read_section (dwarf2_per_objfile->objfile,
-                      &dwarf2_per_objfile->macinfo);
-  if (dwarf2_per_objfile->macinfo.buffer == NULL)
+  switch (form)
     {
-      complaint (&symfile_complaints, _("missing .debug_macinfo section"));
-      return;
+    case DW_FORM_data1:
+    case DW_FORM_flag:
+      ++bytes;
+      break;
+
+    case DW_FORM_data2:
+      bytes += 2;
+      break;
+
+    case DW_FORM_data4:
+      bytes += 4;
+      break;
+
+    case DW_FORM_data8:
+      bytes += 8;
+      break;
+
+    case DW_FORM_string:
+      read_direct_string (abfd, bytes, &bytes_read);
+      bytes += bytes_read;
+      break;
+
+    case DW_FORM_sec_offset:
+    case DW_FORM_strp:
+      bytes += offset_size;
+      break;
+
+    case DW_FORM_block:
+      bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
+      bytes += bytes_read;
+      break;
+
+    case DW_FORM_block1:
+      bytes += 1 + read_1_byte (abfd, bytes);
+      break;
+    case DW_FORM_block2:
+      bytes += 2 + read_2_bytes (abfd, bytes);
+      break;
+    case DW_FORM_block4:
+      bytes += 4 + read_4_bytes (abfd, bytes);
+      break;
+
+    case DW_FORM_sdata:
+    case DW_FORM_udata:
+      bytes = skip_leb128 (abfd, bytes);
+      break;
+
+    default:
+      {
+      complain:
+       complaint (&symfile_complaints,
+                  _("invalid form 0x%x in `%s'"),
+                  form,
+                  section->asection->name);
+       return NULL;
+      }
     }
 
-  /* First pass: Find the name of the base filename.
-     This filename is needed in order to process all macros whose definition
-     (or undefinition) comes from the command line.  These macros are defined
-     before the first DW_MACINFO_start_file entry, and yet still need to be
-     associated to the base file.
+  return bytes;
+}
 
-     To determine the base file name, we scan the macro definitions until we
-     reach the first DW_MACINFO_start_file entry.  We then initialize
-     CURRENT_FILE accordingly so that any macro definition found before the
-     first DW_MACINFO_start_file can still be associated to the base file.  */
+/* A helper for dwarf_decode_macros that handles skipping an unknown
+   opcode.  Returns an updated pointer to the macro data buffer; or,
+   on error, issues a complaint and returns NULL.  */
 
-  mac_ptr = dwarf2_per_objfile->macinfo.buffer + offset;
-  mac_end = dwarf2_per_objfile->macinfo.buffer
-    + dwarf2_per_objfile->macinfo.size;
+static gdb_byte *
+skip_unknown_opcode (unsigned int opcode,
+                    gdb_byte **opcode_definitions,
+                    gdb_byte *mac_ptr,
+                    bfd *abfd,
+                    unsigned int offset_size,
+                    struct dwarf2_section_info *section)
+{
+  unsigned int bytes_read, i;
+  unsigned long arg;
+  gdb_byte *defn;
 
-  do
+  if (opcode_definitions[opcode] == NULL)
     {
-      /* Do we at least have room for a macinfo type byte?  */
-      if (mac_ptr >= mac_end)
-        {
-         /* Complaint is printed during the second pass as GDB will probably
-            stop the first pass earlier upon finding
-            DW_MACINFO_start_file.  */
-         break;
-        }
+      complaint (&symfile_complaints,
+                _("unrecognized DW_MACFINO opcode 0x%x"),
+                opcode);
+      return NULL;
+    }
 
-      macinfo_type = read_1_byte (abfd, mac_ptr);
-      mac_ptr++;
+  defn = opcode_definitions[opcode];
+  arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
+  defn += bytes_read;
 
-      switch (macinfo_type)
-        {
-          /* A zero macinfo type indicates the end of the macro
-             information.  */
-        case 0:
-         break;
+  for (i = 0; i < arg; ++i)
+    {
+      mac_ptr = skip_form_bytes (abfd, mac_ptr, defn[i], offset_size, section);
+      if (mac_ptr == NULL)
+       {
+         /* skip_form_bytes already issued the complaint.  */
+         return NULL;
+       }
+    }
 
-       case DW_MACINFO_define:
-       case DW_MACINFO_undef:
-         /* Only skip the data by MAC_PTR.  */
-         {
-           unsigned int bytes_read;
+  return mac_ptr;
+}
 
-           read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
-           mac_ptr += bytes_read;
-           read_direct_string (abfd, mac_ptr, &bytes_read);
-           mac_ptr += bytes_read;
-         }
-         break;
+/* A helper function which parses the header of a macro section.
+   If the macro section is the extended (for now called "GNU") type,
+   then this updates *OFFSET_SIZE.  Returns a pointer to just after
+   the header, or issues a complaint and returns NULL on error.  */
 
-       case DW_MACINFO_start_file:
-         {
-           unsigned int bytes_read;
-           int line, file;
+static gdb_byte *
+dwarf_parse_macro_header (gdb_byte **opcode_definitions,
+                         bfd *abfd,
+                         gdb_byte *mac_ptr,
+                         unsigned int *offset_size,
+                         int section_is_gnu)
+{
+  memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
 
-           line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
-           mac_ptr += bytes_read;
-           file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
-           mac_ptr += bytes_read;
+  if (section_is_gnu)
+    {
+      unsigned int version, flags;
 
-           current_file = macro_start_file (file, line, current_file,
-                                            comp_dir, lh, cu->objfile);
-         }
-         break;
+      version = read_2_bytes (abfd, mac_ptr);
+      if (version != 4)
+       {
+         complaint (&symfile_complaints,
+                    _("unrecognized version `%d' in .debug_macro section"),
+                    version);
+         return NULL;
+       }
+      mac_ptr += 2;
 
-       case DW_MACINFO_end_file:
-         /* No data to skip by MAC_PTR.  */
-         break;
+      flags = read_1_byte (abfd, mac_ptr);
+      ++mac_ptr;
+      *offset_size = (flags & 1) ? 8 : 4;
 
-       case DW_MACINFO_vendor_ext:
-         /* Only skip the data by MAC_PTR.  */
-         {
-           unsigned int bytes_read;
+      if ((flags & 2) != 0)
+       /* We don't need the line table offset.  */
+       mac_ptr += *offset_size;
 
-           read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
-           mac_ptr += bytes_read;
-           read_direct_string (abfd, mac_ptr, &bytes_read);
-           mac_ptr += bytes_read;
-         }
-         break;
+      /* Vendor opcode descriptions.  */
+      if ((flags & 4) != 0)
+       {
+         unsigned int i, count;
 
-       default:
-         break;
+         count = read_1_byte (abfd, mac_ptr);
+         ++mac_ptr;
+         for (i = 0; i < count; ++i)
+           {
+             unsigned int opcode, bytes_read;
+             unsigned long arg;
+
+             opcode = read_1_byte (abfd, mac_ptr);
+             ++mac_ptr;
+             opcode_definitions[opcode] = mac_ptr;
+             arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
+             mac_ptr += bytes_read;
+             mac_ptr += arg;
+           }
        }
-    } while (macinfo_type != 0 && current_file == NULL);
+    }
 
-  /* Second pass: Process all entries.
+  return mac_ptr;
+}
 
-     Use the AT_COMMAND_LINE flag to determine whether we are still processing
-     command-line macro definitions/undefinitions.  This flag is unset when we
-     reach the first DW_MACINFO_start_file entry.  */
+/* A helper for dwarf_decode_macros that handles the GNU extensions,
+   including DW_GNU_MACINFO_transparent_include.  */
+
+static void
+dwarf_decode_macro_bytes (bfd *abfd, gdb_byte *mac_ptr, gdb_byte *mac_end,
+                         struct macro_source_file *current_file,
+                         struct line_header *lh, char *comp_dir,
+                         struct dwarf2_section_info *section,
+                         int section_is_gnu,
+                         unsigned int offset_size,
+                         struct objfile *objfile)
+{
+  enum dwarf_macro_record_type macinfo_type;
+  int at_commandline;
+  gdb_byte *opcode_definitions[256];
 
-  mac_ptr = dwarf2_per_objfile->macinfo.buffer + offset;
+  mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
+                                     &offset_size, section_is_gnu);
+  if (mac_ptr == NULL)
+    {
+      /* We already issued a complaint.  */
+      return;
+    }
 
   /* Determines if GDB is still before first DW_MACINFO_start_file.  If true
      GDB is still reading the definitions from command line.  First
@@ -14795,13 +14908,15 @@ dwarf_decode_macros (struct line_header *lh, unsigned int offset,
       /* Do we at least have room for a macinfo type byte?  */
       if (mac_ptr >= mac_end)
        {
-         dwarf2_macros_too_long_complaint ();
+         dwarf2_macros_too_long_complaint (section);
          break;
        }
 
       macinfo_type = read_1_byte (abfd, mac_ptr);
       mac_ptr++;
 
+      /* Note that we rely on the fact that the corresponding GNU and
+        DWARF constants are the same.  */
       switch (macinfo_type)
        {
          /* A zero macinfo type indicates the end of the macro
@@ -14809,29 +14924,45 @@ dwarf_decode_macros (struct line_header *lh, unsigned int offset,
        case 0:
          break;
 
-        case DW_MACINFO_define:
-        case DW_MACINFO_undef:
+        case DW_MACRO_GNU_define:
+        case DW_MACRO_GNU_undef:
+       case DW_MACRO_GNU_define_indirect:
+       case DW_MACRO_GNU_undef_indirect:
           {
             unsigned int bytes_read;
             int line;
             char *body;
+           int is_define;
 
-            line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
-            mac_ptr += bytes_read;
-            body = read_direct_string (abfd, mac_ptr, &bytes_read);
-            mac_ptr += bytes_read;
+           line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
+           mac_ptr += bytes_read;
+
+           if (macinfo_type == DW_MACRO_GNU_define
+               || macinfo_type == DW_MACRO_GNU_undef)
+             {
+               body = read_direct_string (abfd, mac_ptr, &bytes_read);
+               mac_ptr += bytes_read;
+             }
+           else
+             {
+               LONGEST str_offset;
+
+               str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
+               mac_ptr += offset_size;
 
+               body = read_indirect_string_at_offset (abfd, str_offset);
+             }
+
+           is_define = (macinfo_type == DW_MACRO_GNU_define
+                        || macinfo_type == DW_MACRO_GNU_define_indirect);
             if (! current_file)
              {
                /* DWARF violation as no main source is present.  */
                complaint (&symfile_complaints,
                           _("debug info with no main source gives macro %s "
                             "on line %d: %s"),
-                          macinfo_type == DW_MACINFO_define ?
-                            _("definition") :
-                              macinfo_type == DW_MACINFO_undef ?
-                                _("undefinition") :
-                                _("something-or-other"), line, body);
+                          is_define ? _("definition") : _("undefinition"),
+                          line, body);
                break;
              }
            if ((line == 0 && !at_commandline)
@@ -14839,21 +14970,21 @@ dwarf_decode_macros (struct line_header *lh, unsigned int offset,
              complaint (&symfile_complaints,
                         _("debug info gives %s macro %s with %s line %d: %s"),
                         at_commandline ? _("command-line") : _("in-file"),
-                        macinfo_type == DW_MACINFO_define ?
-                          _("definition") :
-                            macinfo_type == DW_MACINFO_undef ?
-                              _("undefinition") :
-                              _("something-or-other"),
+                        is_define ? _("definition") : _("undefinition"),
                         line == 0 ? _("zero") : _("non-zero"), line, body);
 
-           if (macinfo_type == DW_MACINFO_define)
+           if (is_define)
              parse_macro_definition (current_file, line, body);
-           else if (macinfo_type == DW_MACINFO_undef)
-             macro_undef (current_file, line, body);
+           else
+             {
+               gdb_assert (macinfo_type == DW_MACRO_GNU_undef
+                           || macinfo_type == DW_MACRO_GNU_undef_indirect);
+               macro_undef (current_file, line, body);
+             }
           }
           break;
 
-        case DW_MACINFO_start_file:
+        case DW_MACRO_GNU_start_file:
           {
             unsigned int bytes_read;
             int line, file;
@@ -14873,17 +15004,18 @@ dwarf_decode_macros (struct line_header *lh, unsigned int offset,
 
            if (at_commandline)
              {
-               /* This DW_MACINFO_start_file was executed in the pass one.  */
+               /* This DW_MACRO_GNU_start_file was executed in the
+                  pass one.  */
                at_commandline = 0;
              }
            else
              current_file = macro_start_file (file, line,
                                               current_file, comp_dir,
-                                              lh, cu->objfile);
+                                              lh, objfile);
           }
           break;
 
-        case DW_MACINFO_end_file:
+        case DW_MACRO_GNU_end_file:
           if (! current_file)
            complaint (&symfile_complaints,
                       _("macro debug info has an unmatched "
@@ -14893,7 +15025,7 @@ dwarf_decode_macros (struct line_header *lh, unsigned int offset,
               current_file = current_file->included_by;
               if (! current_file)
                 {
-                  enum dwarf_macinfo_record_type next_type;
+                  enum dwarf_macro_record_type next_type;
 
                   /* GCC circa March 2002 doesn't produce the zero
                      type byte marking the end of the compilation
@@ -14903,7 +15035,7 @@ dwarf_decode_macros (struct line_header *lh, unsigned int offset,
                   /* Do we at least have room for a macinfo type byte?  */
                   if (mac_ptr >= mac_end)
                     {
-                     dwarf2_macros_too_long_complaint ();
+                     dwarf2_macros_too_long_complaint (section);
                       return;
                     }
 
@@ -14920,23 +15052,199 @@ dwarf_decode_macros (struct line_header *lh, unsigned int offset,
             }
           break;
 
+       case DW_MACRO_GNU_transparent_include:
+         {
+           LONGEST offset;
+
+           offset = read_offset_1 (abfd, mac_ptr, offset_size);
+           mac_ptr += offset_size;
+
+           dwarf_decode_macro_bytes (abfd,
+                                     section->buffer + offset,
+                                     mac_end, current_file,
+                                     lh, comp_dir,
+                                     section, section_is_gnu,
+                                     offset_size, objfile);
+         }
+         break;
+
         case DW_MACINFO_vendor_ext:
-          {
-            unsigned int bytes_read;
-            int constant;
+         if (!section_is_gnu)
+           {
+             unsigned int bytes_read;
+             int constant;
 
-            constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
-            mac_ptr += bytes_read;
-            read_direct_string (abfd, mac_ptr, &bytes_read);
-            mac_ptr += bytes_read;
+             constant = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
+             mac_ptr += bytes_read;
+             read_direct_string (abfd, mac_ptr, &bytes_read);
+             mac_ptr += bytes_read;
 
-            /* We don't recognize any vendor extensions.  */
-          }
-          break;
+             /* We don't recognize any vendor extensions.  */
+             break;
+           }
+         /* FALLTHROUGH */
+
+       default:
+         mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
+                                        mac_ptr, abfd, offset_size,
+                                        section);
+         if (mac_ptr == NULL)
+           return;
+         break;
         }
     } while (macinfo_type != 0);
 }
 
+static void
+dwarf_decode_macros (struct line_header *lh, unsigned int offset,
+                     char *comp_dir, bfd *abfd,
+                     struct dwarf2_cu *cu,
+                    struct dwarf2_section_info *section,
+                    int section_is_gnu)
+{
+  gdb_byte *mac_ptr, *mac_end;
+  struct macro_source_file *current_file = 0;
+  enum dwarf_macro_record_type macinfo_type;
+  unsigned int offset_size = cu->header.offset_size;
+  gdb_byte *opcode_definitions[256];
+
+  dwarf2_read_section (dwarf2_per_objfile->objfile, section);
+  if (section->buffer == NULL)
+    {
+      complaint (&symfile_complaints, _("missing %s section"),
+                section->asection->name);
+      return;
+    }
+
+  /* First pass: Find the name of the base filename.
+     This filename is needed in order to process all macros whose definition
+     (or undefinition) comes from the command line.  These macros are defined
+     before the first DW_MACINFO_start_file entry, and yet still need to be
+     associated to the base file.
+
+     To determine the base file name, we scan the macro definitions until we
+     reach the first DW_MACINFO_start_file entry.  We then initialize
+     CURRENT_FILE accordingly so that any macro definition found before the
+     first DW_MACINFO_start_file can still be associated to the base file.  */
+
+  mac_ptr = section->buffer + offset;
+  mac_end = section->buffer + section->size;
+
+  mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
+                                     &offset_size, section_is_gnu);
+  if (mac_ptr == NULL)
+    {
+      /* We already issued a complaint.  */
+      return;
+    }
+
+  do
+    {
+      /* Do we at least have room for a macinfo type byte?  */
+      if (mac_ptr >= mac_end)
+        {
+         /* Complaint is printed during the second pass as GDB will probably
+            stop the first pass earlier upon finding
+            DW_MACINFO_start_file.  */
+         break;
+        }
+
+      macinfo_type = read_1_byte (abfd, mac_ptr);
+      mac_ptr++;
+
+      /* Note that we rely on the fact that the corresponding GNU and
+        DWARF constants are the same.  */
+      switch (macinfo_type)
+        {
+          /* A zero macinfo type indicates the end of the macro
+             information.  */
+        case 0:
+         break;
+
+       case DW_MACRO_GNU_define:
+       case DW_MACRO_GNU_undef:
+         /* Only skip the data by MAC_PTR.  */
+         {
+           unsigned int bytes_read;
+
+           read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
+           mac_ptr += bytes_read;
+           read_direct_string (abfd, mac_ptr, &bytes_read);
+           mac_ptr += bytes_read;
+         }
+         break;
+
+       case DW_MACRO_GNU_start_file:
+         {
+           unsigned int bytes_read;
+           int line, file;
+
+           line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
+           mac_ptr += bytes_read;
+           file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
+           mac_ptr += bytes_read;
+
+           current_file = macro_start_file (file, line, current_file,
+                                            comp_dir, lh, cu->objfile);
+         }
+         break;
+
+       case DW_MACRO_GNU_end_file:
+         /* No data to skip by MAC_PTR.  */
+         break;
+
+       case DW_MACRO_GNU_define_indirect:
+       case DW_MACRO_GNU_undef_indirect:
+         {
+           unsigned int bytes_read;
+
+           read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
+           mac_ptr += bytes_read;
+           mac_ptr += offset_size;
+         }
+         break;
+
+       case DW_MACRO_GNU_transparent_include:
+         /* Note that, according to the spec, a transparent include
+            chain cannot call DW_MACRO_GNU_start_file.  So, we can just
+            skip this opcode.  */
+         mac_ptr += offset_size;
+         break;
+
+       case DW_MACINFO_vendor_ext:
+         /* Only skip the data by MAC_PTR.  */
+         if (!section_is_gnu)
+           {
+             unsigned int bytes_read;
+
+             read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
+             mac_ptr += bytes_read;
+             read_direct_string (abfd, mac_ptr, &bytes_read);
+             mac_ptr += bytes_read;
+           }
+         /* FALLTHROUGH */
+
+       default:
+         mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
+                                        mac_ptr, abfd, offset_size,
+                                        section);
+         if (mac_ptr == NULL)
+           return;
+         break;
+       }
+    } while (macinfo_type != 0 && current_file == NULL);
+
+  /* Second pass: Process all entries.
+
+     Use the AT_COMMAND_LINE flag to determine whether we are still processing
+     command-line macro definitions/undefinitions.  This flag is unset when we
+     reach the first DW_MACINFO_start_file entry.  */
+
+  dwarf_decode_macro_bytes (abfd, section->buffer + offset, mac_end,
+                           current_file, lh, comp_dir, section, section_is_gnu,
+                           offset_size, cu->objfile);
+}
+
 /* Check if the attribute's form is a DW_FORM_block*
    if so return true else false.  */
 static int
@@ -15663,6 +15971,7 @@ dwarf2_per_objfile_free (struct objfile *objfile, void *d)
   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->frame);
index cc65a14140d0a7da7827f94c072641ec345baa9f..eb5beaa6739c8fbe3d2b6de50017d48d8b7e85ab 100644 (file)
@@ -582,6 +582,7 @@ struct dwarf2_debug_sections {
   struct dwarf2_section_names line;
   struct dwarf2_section_names loc;
   struct dwarf2_section_names macinfo;
+  struct dwarf2_section_names macro;
   struct dwarf2_section_names str;
   struct dwarf2_section_names ranges;
   struct dwarf2_section_names types;
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