* dwarf2-frame.c (decode_frame_entry_1): Handle CIE version 4.

	(struct dwarf2_cie) <segment_size>: New field.
	* dwarf2read.c (partial_read_comp_unit_head): Accept DWARF 4.
	(skip_one_die): Handle DW_FORM_flag_present, DW_FORM_sec_offset,
	DW_FORM_exprloc.
	(read_attribute_value): Handle DW_FORM_flag_present,
	DW_FORM_sec_offset, DW_FORM_exprloc.
	(dump_die_shallow): Likewise.
	(attr_form_is_section_offset): Handle DW_FORM_sec_offset.
	(dwarf2_const_value): Handle DW_FORM_exprloc.
	(attr_form_is_block): Likewise.
	(struct line_header) <maximum_ops_per_instruction>: New field.
	(dwarf_decode_line_header): Set new field.
	(dwarf_decode_lines): Handle new field.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 1688663..c9c44b7 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,20 @@
+2010-04-20  Tom Tromey  <tromey@redhat.com>
+
+       * dwarf2-frame.c (decode_frame_entry_1): Handle CIE version 4.
+       (struct dwarf2_cie) <segment_size>: New field.
+       * dwarf2read.c (partial_read_comp_unit_head): Accept DWARF 4.
+       (skip_one_die): Handle DW_FORM_flag_present, DW_FORM_sec_offset,
+       DW_FORM_exprloc.
+       (read_attribute_value): Handle DW_FORM_flag_present,
+       DW_FORM_sec_offset, DW_FORM_exprloc.
+       (dump_die_shallow): Likewise.
+       (attr_form_is_section_offset): Handle DW_FORM_sec_offset.
+       (dwarf2_const_value): Handle DW_FORM_exprloc.
+       (attr_form_is_block): Likewise.
+       (struct line_header) <maximum_ops_per_instruction>: New field.
+       (dwarf_decode_line_header): Set new field.
+       (dwarf_decode_lines): Handle new field.
+
 2010-04-20  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
        * f-exp.y: Add new production to recognize the `logical*8' type.

diff --git a/gdb/dwarf2-frame.c b/gdb/dwarf2-frame.c
index 47a2cf1..33d001c 100644 (file)
--- a/gdb/dwarf2-frame.c
+++ b/gdb/dwarf2-frame.c
@@ -85,6 +85,9 @@ struct dwarf2_cie
 
   /* The version recorded in the CIE.  */
   unsigned char version;
+
+  /* The segment size.  */
+  unsigned char segment_size;
 };
 
 struct dwarf2_cie_table
@@ -1714,7 +1717,7 @@ decode_frame_entry_1 (struct comp_unit *unit, gdb_byte *start, int eh_frame_p,
 
       /* Check version number.  */
       cie_version = read_1_byte (unit->abfd, buf);
-      if (cie_version != 1 && cie_version != 3)
+      if (cie_version != 1 && cie_version != 3 && cie_version != 4)
        return NULL;
       cie->version = cie_version;
       buf += 1;
@@ -1738,6 +1741,20 @@ decode_frame_entry_1 (struct comp_unit *unit, gdb_byte *start, int eh_frame_p,
          augmentation += 2;
        }
 
+      if (cie->version >= 4)
+       {
+         /* FIXME: check that this is the same as from the CU header.  */
+         cie->addr_size = read_1_byte (unit->abfd, buf);
+         ++buf;
+         cie->segment_size = read_1_byte (unit->abfd, buf);
+         ++buf;
+       }
+      else
+       {
+         cie->addr_size = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT;
+         cie->segment_size = 0;
+       }
+
       cie->code_alignment_factor =
        read_unsigned_leb128 (unit->abfd, buf, &bytes_read);
       buf += bytes_read;

diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 724016f..a948218 100644 (file)
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -396,6 +396,7 @@ struct line_header
   unsigned short version;
   unsigned int header_length;
   unsigned char minimum_instruction_length;
+  unsigned char maximum_ops_per_instruction;
   unsigned char default_is_stmt;
   int line_base;
   unsigned char line_range;
@@ -1488,10 +1489,10 @@ partial_read_comp_unit_head (struct comp_unit_head *header, gdb_byte *info_ptr,
 
   info_ptr = read_comp_unit_head (header, info_ptr, abfd);
 
-  if (header->version != 2 && header->version != 3)
+  if (header->version != 2 && header->version != 3 && header->version != 4)
     error (_("Dwarf Error: wrong version in compilation unit header "
-          "(is %d, should be %d) [in module %s]"), header->version,
-          2, bfd_get_filename (abfd));
+          "(is %d, should be 2, 3, or 4) [in module %s]"), header->version,
+          bfd_get_filename (abfd));
 
   if (header->abbrev_offset >= dwarf2_per_objfile->abbrev.size)
     error (_("Dwarf Error: bad offset (0x%lx) in compilation unit header "
@@ -2776,6 +2777,8 @@ skip_one_die (gdb_byte *buffer, gdb_byte *info_ptr,
        case DW_FORM_flag:
          info_ptr += 1;
          break;
+       case DW_FORM_flag_present:
+         break;
        case DW_FORM_data2:
        case DW_FORM_ref2:
          info_ptr += 2;
@@ -2793,9 +2796,11 @@ skip_one_die (gdb_byte *buffer, gdb_byte *info_ptr,
          read_string (abfd, info_ptr, &bytes_read);
          info_ptr += bytes_read;
          break;
+       case DW_FORM_sec_offset:
        case DW_FORM_strp:
          info_ptr += cu->header.offset_size;
          break;
+       case DW_FORM_exprloc:
        case DW_FORM_block:
          info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
          info_ptr += bytes_read;
@@ -7129,6 +7134,10 @@ read_attribute_value (struct attribute *attr, unsigned form,
       DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
       info_ptr += 8;
       break;
+    case DW_FORM_sec_offset:
+      DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
+      info_ptr += bytes_read;
+      break;
     case DW_FORM_string:
       DW_STRING (attr) = read_string (abfd, info_ptr, &bytes_read);
       DW_STRING_IS_CANONICAL (attr) = 0;
@@ -7140,6 +7149,7 @@ read_attribute_value (struct attribute *attr, unsigned form,
       DW_STRING_IS_CANONICAL (attr) = 0;
       info_ptr += bytes_read;
       break;
+    case DW_FORM_exprloc:
     case DW_FORM_block:
       blk = dwarf_alloc_block (cu);
       blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
@@ -7164,6 +7174,9 @@ read_attribute_value (struct attribute *attr, unsigned form,
       DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
       info_ptr += 1;
       break;
+    case DW_FORM_flag_present:
+      DW_UNSND (attr) = 1;
+      break;
     case DW_FORM_sdata:
       DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
       info_ptr += bytes_read;
@@ -7680,7 +7693,7 @@ dwarf2_attr_no_follow (struct die_info *die, unsigned int name,
 
 /* Return non-zero iff the attribute NAME is defined for the given DIE,
    and holds a non-zero value.  This function should only be used for
-   DW_FORM_flag attributes.  */
+   DW_FORM_flag or DW_FORM_flag_present attributes.  */
 
 static int
 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
@@ -7862,6 +7875,21 @@ dwarf_decode_line_header (unsigned int offset, bfd *abfd,
   line_ptr += offset_size;
   lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
   line_ptr += 1;
+  if (lh->version >= 4)
+    {
+      lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
+      line_ptr += 1;
+    }
+  else
+    lh->maximum_ops_per_instruction = 1;
+
+  if (lh->maximum_ops_per_instruction == 0)
+    {
+      lh->maximum_ops_per_instruction = 1;
+      complaint (&symfile_complaints,
+                _("invalid maximum_ops_per_instruction in `.debug_line' section"));
+    }
+
   lh->default_is_stmt = read_1_byte (abfd, line_ptr);
   line_ptr += 1;
   lh->line_base = read_1_signed_byte (abfd, line_ptr);
@@ -8010,6 +8038,7 @@ dwarf_decode_lines (struct line_header *lh, char *comp_dir, bfd *abfd,
       int basic_block = 0;
       int end_sequence = 0;
       CORE_ADDR addr;
+      unsigned char op_index = 0;
 
       if (!decode_for_pst_p && lh->num_file_names >= file)
        {
@@ -8041,12 +8070,17 @@ dwarf_decode_lines (struct line_header *lh, char *comp_dir, bfd *abfd,
            {           
              /* Special operand.  */
              adj_opcode = op_code - lh->opcode_base;
-             address += (adj_opcode / lh->line_range)
-               * lh->minimum_instruction_length;
+             address += (((op_index + (adj_opcode / lh->line_range))
+                          / lh->maximum_ops_per_instruction)
+                         * lh->minimum_instruction_length);
+             op_index = ((op_index + (adj_opcode / lh->line_range))
+                         % lh->maximum_ops_per_instruction);
              line += lh->line_base + (adj_opcode % lh->line_range);
              if (lh->num_file_names < file || file == 0)
                dwarf2_debug_line_missing_file_complaint ();
-             else
+             /* For now we ignore lines not starting on an
+                instruction boundary.  */
+             else if (op_index == 0)
                {
                  lh->file_names[file - 1].included_p = 1;
                  if (!decode_for_pst_p && is_stmt)
@@ -8081,6 +8115,7 @@ dwarf_decode_lines (struct line_header *lh, char *comp_dir, bfd *abfd,
                  break;
                case DW_LNE_set_address:
                  address = read_address (abfd, line_ptr, cu, &bytes_read);
+                 op_index = 0;
                  line_ptr += bytes_read;
                  address += baseaddr;
                  break;
@@ -8146,9 +8181,17 @@ dwarf_decode_lines (struct line_header *lh, char *comp_dir, bfd *abfd,
              basic_block = 0;
              break;
            case DW_LNS_advance_pc:
-             address += lh->minimum_instruction_length
-               * read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
-             line_ptr += bytes_read;
+             {
+               CORE_ADDR adjust
+                 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+
+               address += (((op_index + adjust)
+                            / lh->maximum_ops_per_instruction)
+                           * lh->minimum_instruction_length);
+               op_index = ((op_index + adjust)
+                           % lh->maximum_ops_per_instruction);
+               line_ptr += bytes_read;
+             }
              break;
            case DW_LNS_advance_line:
              line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
@@ -8195,11 +8238,19 @@ dwarf_decode_lines (struct line_header *lh, char *comp_dir, bfd *abfd,
               instruction length since special opcode 255 would have
               scaled the the increment.  */
            case DW_LNS_const_add_pc:
-             address += (lh->minimum_instruction_length
-                         * ((255 - lh->opcode_base) / lh->line_range));
+             {
+               CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range;
+
+               address += (((op_index + adjust)
+                            / lh->maximum_ops_per_instruction)
+                           * lh->minimum_instruction_length);
+               op_index = ((op_index + adjust)
+                           % lh->maximum_ops_per_instruction);
+             }
              break;
            case DW_LNS_fixed_advance_pc:
              address += read_2_bytes (abfd, line_ptr);
+             op_index = 0;
              line_ptr += 2;
              break;
            default:
@@ -8761,6 +8812,7 @@ dwarf2_const_value (struct attribute *attr, struct symbol *sym,
     case DW_FORM_block2:
     case DW_FORM_block4:
     case DW_FORM_block:
+    case DW_FORM_exprloc:
       blk = DW_BLOCK (attr);
       if (TYPE_LENGTH (SYMBOL_TYPE (sym)) != blk->size)
        dwarf2_const_value_length_mismatch_complaint (SYMBOL_PRINT_NAME (sym),
@@ -10308,6 +10360,10 @@ dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
        case DW_FORM_block1:
          fprintf_unfiltered (f, "block: size %d", DW_BLOCK (&die->attrs[i])->size);
          break;
+       case DW_FORM_exprloc:
+         fprintf_unfiltered (f, "expression: size %u",
+                             DW_BLOCK (&die->attrs[i])->size);
+         break;
        case DW_FORM_ref1:
        case DW_FORM_ref2:
        case DW_FORM_ref4:
@@ -10323,6 +10379,10 @@ dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
          fprintf_unfiltered (f, "constant: %s",
                              pulongest (DW_UNSND (&die->attrs[i])));
          break;
+       case DW_FORM_sec_offset:
+         fprintf_unfiltered (f, "section offset: %s",
+                             pulongest (DW_UNSND (&die->attrs[i])));
+         break;
        case DW_FORM_sig8:
          if (DW_SIGNATURED_TYPE (&die->attrs[i]) != NULL)
            fprintf_unfiltered (f, "signatured type, offset: 0x%x",
@@ -10343,6 +10403,9 @@ dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
          else
            fprintf_unfiltered (f, "flag: FALSE");
          break;
+       case DW_FORM_flag_present:
+         fprintf_unfiltered (f, "flag: TRUE");
+         break;
        case DW_FORM_indirect:
          /* the reader will have reduced the indirect form to
             the "base form" so this form should not occur */
@@ -11520,7 +11583,8 @@ attr_form_is_block (struct attribute *attr)
       attr->form == DW_FORM_block1
       || attr->form == DW_FORM_block2
       || attr->form == DW_FORM_block4
-      || attr->form == DW_FORM_block);
+      || attr->form == DW_FORM_block
+      || attr->form == DW_FORM_exprloc);
 }
 
 /* Return non-zero if ATTR's value is a section offset --- classes
@@ -11535,7 +11599,8 @@ static int
 attr_form_is_section_offset (struct attribute *attr)
 {
   return (attr->form == DW_FORM_data4
-          || attr->form == DW_FORM_data8);
+          || attr->form == DW_FORM_data8
+         || attr->form == DW_FORM_sec_offset);
 }