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Re: gdb can't handle a DIE with both sibling and children


On Thu, Jul 31, 2003 at 02:20:49PM -0400, Daniel Jacobowitz wrote:
> 
> Why don't you be more specific?  What problem is it causing, on what
> input?
> 

I am trying to add support for DW_TAG_entry_point. 

 <1><8e>: Abbrev Number: 4 (DW_TAG_subprogram)

has both sibling and children. Since we skip to sibling, we miss the
children, which is

 <2><c3>: Abbrev Number: 6 (DW_TAG_entry_point)


H.J.
----
The section .debug_info contains:

  Compilation Unit @ 0:
   Length:        304
   Version:       2
   Abbrev Offset: 0
   Pointer Size:  4
 <0><b>: Abbrev Number: 1 (DW_TAG_compile_unit)
     DW_AT_comp_dir    : /home/cmplr/usr2/mtokugaw	
     DW_AT_language    : 8	(Fortran 90)
     DW_AT_name        : test.f	
     DW_AT_producer    : EPC Fortran-95 Version F95 Intel:200200:131124	
     DW_AT_stmt_list   : 0	
 <1><61>: Abbrev Number: 2 (DW_TAG_base_type)
     DW_AT_byte_size   : 0	
     DW_AT_encoding    : 5	(signed)
     DW_AT_name        : void	
 <1><69>: Abbrev Number: 3 (DW_TAG_subprogram)
     DW_AT_decl_line   : 1	
     DW_AT_decl_column : 0	
     DW_AT_decl_file   : 1	
     DW_AT_sibling     : <8e>	
     DW_AT_accessibility: 1	(public)
     DW_AT_calling_convention: 2	(program)
     DW_AT_name        : main.program	
     DW_AT_type        : <61>	
     DW_AT_prototyped  : 0	
     DW_AT_high_pc     : 0x8049206 134517254	
     DW_AT_low_pc      : 0x8049198 134517144	
     DW_AT_external    : 1	
 <1><8e>: Abbrev Number: 4 (DW_TAG_subprogram)
     DW_AT_decl_line   : 6	
     DW_AT_decl_column : 0	
     DW_AT_decl_file   : 1	
     DW_AT_sibling     : <125>	
     DW_AT_accessibility: 1	(public)
     DW_AT_name        : wkinit	
     DW_AT_type        : <61>	
     DW_AT_prototyped  : 0	
     DW_AT_high_pc     : 0x8049456 134517846	
     DW_AT_low_pc      : 0x8049206 134517254	
     DW_AT_external    : 1	
 <2><ac>: Abbrev Number: 5 (DW_TAG_formal_parameter)
     DW_AT_decl_line   : 31	
     DW_AT_decl_column : 0	
     DW_AT_decl_file   : 1	
     DW_AT_type        : <125>	
     DW_AT_variable_parameter: 1	
     DW_AT_name        : wksize	
     DW_AT_location    : 6 byte block: 3 8 a0 7 8 6 	(DW_OP_addr: 807a008; DW_OP_deref)
 <2><c3>: Abbrev Number: 6 (DW_TAG_entry_point)
     DW_AT_decl_line   : 20	
     DW_AT_decl_column : 0	
     DW_AT_decl_file   : 1	
     DW_AT_sibling     : <f2>	
     DW_AT_name        : wkprnt	
     DW_AT_type        : <61>	
     DW_AT_low_pc      : 0x80492ac 134517420	
 <3><da>: Abbrev Number: 5 (DW_TAG_formal_parameter)
     DW_AT_decl_line   : 31	
     DW_AT_decl_column : 0	
     DW_AT_decl_file   : 1	
     DW_AT_type        : <125>	
     DW_AT_variable_parameter: 1	
     DW_AT_name        : jprint	
     DW_AT_location    : 6 byte block: 3 14 a0 7 8 6 	(DW_OP_addr: 807a014; DW_OP_deref)
 <2><f2>: Abbrev Number: 7 (DW_TAG_variable)
     DW_AT_decl_line   : 31	
     DW_AT_decl_column : 0	
     DW_AT_decl_file   : 1	
     DW_AT_accessibility: 1	(public)
     DW_AT_name        : jpr	
     DW_AT_type        : <125>	
     DW_AT_location    : 5 byte block: 3 c a0 7 8 	(DW_OP_addr: 807a00c)
     DW_AT_external    : 0	
     DW_AT_start_scope : 0x8049454 134517844	
 <2><10a>: Abbrev Number: 7 (DW_TAG_variable)
     DW_AT_decl_line   : 31	
     DW_AT_decl_column : 0	
     DW_AT_decl_file   : 1	
     DW_AT_accessibility: 1	(public)
     DW_AT_name        : nsize	
     DW_AT_type        : <125>	
     DW_AT_location    : 5 byte block: 3 10 a0 7 8 	(DW_OP_addr: 807a010)
     DW_AT_external    : 0	
     DW_AT_start_scope : 0x8049454 134517844	
 <1><125>: Abbrev Number: 2 (DW_TAG_base_type)
     DW_AT_byte_size   : 4	
     DW_AT_encoding    : 5	(signed)
     DW_AT_name        : integer	

Contents of the .debug_abbrev section:

  Number TAG
   1      DW_TAG_compile_unit    [has children]
    DW_AT_comp_dir     DW_FORM_string
    DW_AT_language     DW_FORM_data1
    DW_AT_name         DW_FORM_string
    DW_AT_producer     DW_FORM_string
    DW_AT_stmt_list    DW_FORM_data4
   2      DW_TAG_base_type    [no children]
    DW_AT_byte_size    DW_FORM_data1
    DW_AT_encoding     DW_FORM_data1
    DW_AT_name         DW_FORM_string
   3      DW_TAG_subprogram    [no children]
    DW_AT_decl_line    DW_FORM_data1
    DW_AT_decl_column  DW_FORM_data1
    DW_AT_decl_file    DW_FORM_data1
    DW_AT_sibling      DW_FORM_ref4
    DW_AT_accessibility DW_FORM_data1
    DW_AT_calling_convention DW_FORM_data1
    DW_AT_name         DW_FORM_string
    DW_AT_type         DW_FORM_ref4
    DW_AT_prototyped   DW_FORM_flag
    DW_AT_high_pc      DW_FORM_addr
    DW_AT_low_pc       DW_FORM_addr
    DW_AT_external     DW_FORM_flag
   4      DW_TAG_subprogram    [has children]
    DW_AT_decl_line    DW_FORM_data1
    DW_AT_decl_column  DW_FORM_data1
    DW_AT_decl_file    DW_FORM_data1
    DW_AT_sibling      DW_FORM_ref4
    DW_AT_accessibility DW_FORM_data1
    DW_AT_name         DW_FORM_string
    DW_AT_type         DW_FORM_ref4
    DW_AT_prototyped   DW_FORM_flag
    DW_AT_high_pc      DW_FORM_addr
    DW_AT_low_pc       DW_FORM_addr
    DW_AT_external     DW_FORM_flag
   5      DW_TAG_formal_parameter    [no children]
    DW_AT_decl_line    DW_FORM_data1
    DW_AT_decl_column  DW_FORM_data1
    DW_AT_decl_file    DW_FORM_data1
    DW_AT_type         DW_FORM_ref4
    DW_AT_variable_parameter DW_FORM_flag
    DW_AT_name         DW_FORM_string
    DW_AT_location     DW_FORM_block1
   6      DW_TAG_entry_point    [has children]
    DW_AT_decl_line    DW_FORM_data1
    DW_AT_decl_column  DW_FORM_data1
    DW_AT_decl_file    DW_FORM_data1
    DW_AT_sibling      DW_FORM_ref4
    DW_AT_name         DW_FORM_string
    DW_AT_type         DW_FORM_ref4
    DW_AT_low_pc       DW_FORM_addr
   7      DW_TAG_variable    [no children]
    DW_AT_decl_line    DW_FORM_data1
    DW_AT_decl_column  DW_FORM_data1
    DW_AT_decl_file    DW_FORM_data1
    DW_AT_accessibility DW_FORM_data1
    DW_AT_name         DW_FORM_string
    DW_AT_type         DW_FORM_ref4
    DW_AT_location     DW_FORM_block1
    DW_AT_external     DW_FORM_flag
    DW_AT_start_scope  DW_FORM_addr


Dump of debug contents of section .debug_line:

  Length:                      94
  DWARF Version:               2
  Prologue Length:             31
  Minimum Instruction Length:  1
  Initial value of 'is_stmt':  0
  Line Base:                   -1
  Line Range:                  4
  Opcode Base:                 10

 Opcodes:
  Opcode 1 has 0 args
  Opcode 2 has 1 args
  Opcode 3 has 1 args
  Opcode 4 has 1 args
  Opcode 5 has 1 args
  Opcode 6 has 0 args
  Opcode 7 has 0 args
  Opcode 8 has 0 args
  Opcode 9 has 1 args

 The Directory Table is empty.

 The File Name Table:
  Entry	Dir	Time	Size	Name
  1	0	1059586658	583	test.f

 Line Number Statements:
  Extended opcode 2: set Address to 0x8049198
  Copy
  Special opcode 158: advance Address by 39 to 0x80491bf and Line by 1 to 2
  Special opcode 82: advance Address by 20 to 0x80491d3 and Line by 1 to 3
  Special opcode 82: advance Address by 20 to 0x80491e7 and Line by 1 to 4
  Special opcode 127: advance Address by 31 to 0x8049206 and Line by 2 to 6
  Advance PC by 11 to 8049211
  Advance Line by 7 to 13
  Copy
  Special opcode 51: advance Address by 12 to 0x804921d and Line by 2 to 15
  Advance PC by 126 to 804929b
  Advance Line by 2 to 17
  Copy
  Advance PC by 17 to 80492ac
  Advance Line by 3 to 20
  Copy
  Special opcode 46: advance Address by 11 to 0x80492b7 and Line by 1 to 21
  Advance PC by 124 to 8049333
  Advance Line by 1 to 22
  Copy
  Advance PC by 126 to 80493b1
  Advance Line by 1 to 23
  Copy
  Special opcode 50: advance Address by 12 to 0x80493bd and Line by 1 to 24
  Special opcode 63: advance Address by 15 to 0x80493cc and Line by 2 to 26
  Special opcode 51: advance Address by 12 to 0x80493d8 and Line by 2 to 28
  Advance PC by 124 to 8049454
  Advance Line by 3 to 31
  Copy
  Extended opcode 2: set Address to 0x8049456
  Extended opcode 1: End of Sequence



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