From: "Erik Niessen" <erik.niessen@gmail.com>
To: "Erik Niessen" <erik.niessen@gmail.com>, gdb@sourceware.org
Subject: Re: inconsistency in printing out the value of an unsigned short in gdb
Date: Thu, 27 Sep 2007 11:27:00 -0000 [thread overview]
Message-ID: <f21fe8a50709270341u36027f27l70f9cbca5bd97085@mail.gmail.com> (raw)
In-Reply-To: <20070926212800.GC17502@caradoc.them.org>
[-- Attachment #1: Type: text/plain, Size: 659 bytes --]
I ran the readelf -wi on my executable. The output file is attached.
Looking at this debug info all the 3 variables are of type short
unsigned int 2 byte size.
So it looks that the debug info generated by the compiler is correct?
Cheers,
Erik
On 9/26/07, Daniel Jacobowitz <drow@false.org> wrote:
> On Wed, Sep 26, 2007 at 09:35:55AM +0200, Erik Niessen wrote:
> > Hi Daniel,
> >
> > Thanks for your fast reply. I tried with different versions of g++
> > (3.4.6, 4.0, 4.0.4) they all have the same problem.
> > Is there a way how I can check the produced debug info for example via objdump?
>
> Try readelf -wi.
>
> --
> Daniel Jacobowitz
> CodeSourcery
>
[-- Attachment #2: constants++.txt --]
[-- Type: text/plain, Size: 8870 bytes --]
The section .debug_info contains:
Compilation Unit @ offset 0x0:
Length: 118
Version: 2
Abbrev Offset: 0
Pointer Size: 4
<0><b>: Abbrev Number: 1 (DW_TAG_compile_unit)
DW_AT_stmt_list : 0
DW_AT_low_pc : 0x8048378
DW_AT_high_pc : 0x804839a
DW_AT_name : ../sysdeps/i386/elf/start.S
DW_AT_comp_dir : /build/buildd/glibc-2.3.6/build-tree/glibc-2.3.6/csu
DW_AT_producer : GNU AS 2.16.91
DW_AT_language : 32769 (MIPS assembler)
Compilation Unit @ offset 0x7a:
Length: 141
Version: 2
Abbrev Offset: 20
Pointer Size: 4
<0><85>: Abbrev Number: 1 (DW_TAG_compile_unit)
DW_AT_stmt_list : 0x5b
DW_AT_high_pc : 0x804839c
DW_AT_low_pc : 0x804839c
DW_AT_producer : (indirect string, offset: 0x62): GNU C 3.4.6 (Ubuntu 3.4.6-1ubuntu2)
DW_AT_language : 1 (ANSI C)
DW_AT_name : (indirect string, offset: 0x0): init.c
DW_AT_comp_dir : (indirect string, offset: 0x11): /build/buildd/glibc-2.3.6/build-tree/glibc-2.3.6/csu
<1><9f>: Abbrev Number: 2 (DW_TAG_base_type)
DW_AT_name : (indirect string, offset: 0x90): unsigned int
DW_AT_byte_size : 4
DW_AT_encoding : 7 (unsigned)
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DW_AT_name : (indirect string, offset: 0x54): unsigned char
DW_AT_byte_size : 1
DW_AT_encoding : 8 (unsigned char)
<1><ad>: Abbrev Number: 2 (DW_TAG_base_type)
DW_AT_name : (indirect string, offset: 0x9d): short unsigned int
DW_AT_byte_size : 2
DW_AT_encoding : 7 (unsigned)
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DW_AT_name : (indirect string, offset: 0x8b): long unsigned int
DW_AT_byte_size : 4
DW_AT_encoding : 7 (unsigned)
<1><bb>: Abbrev Number: 2 (DW_TAG_base_type)
DW_AT_name : (indirect string, offset: 0x56): signed char
DW_AT_byte_size : 1
DW_AT_encoding : 6 (signed char)
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DW_AT_byte_size : 2
DW_AT_encoding : 5 (signed)
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DW_AT_name : int
DW_AT_byte_size : 4
DW_AT_encoding : 5 (signed)
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DW_AT_name : (indirect string, offset: 0x46): long long int
DW_AT_byte_size : 8
DW_AT_encoding : 5 (signed)
<1><d7>: Abbrev Number: 2 (DW_TAG_base_type)
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DW_AT_encoding : 7 (unsigned)
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DW_AT_byte_size : 4
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<1><f3>: Abbrev Number: 4 (DW_TAG_variable)
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DW_AT_decl_line : 25
DW_AT_type : <105>
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<1><105>: Abbrev Number: 5 (DW_TAG_const_type)
DW_AT_type : <c9>
Compilation Unit @ offset 0x10b:
Length: 140
Version: 2
Abbrev Offset: 86
Pointer Size: 4
<0><116>: Abbrev Number: 1 (DW_TAG_compile_unit)
DW_AT_stmt_list : 0x82
DW_AT_name : /build/buildd/glibc-2.3.6/build-tree/i386-libc/csu/crti.S
DW_AT_comp_dir : /build/buildd/glibc-2.3.6/build-tree/glibc-2.3.6/csu
DW_AT_producer : GNU AS 2.16.91
DW_AT_language : 32769 (MIPS assembler)
Compilation Unit @ offset 0x19b:
Length: 414
Version: 2
Abbrev Offset: 102
Pointer Size: 4
<0><1a6>: Abbrev Number: 1 (DW_TAG_compile_unit)
DW_AT_stmt_list : 0x12f
DW_AT_high_pc : 0x804847e
DW_AT_low_pc : 0x804841c
DW_AT_producer : GNU C++ 3.4.6 (Ubuntu 3.4.6-1ubuntu2)
DW_AT_language : 4 (C++)
DW_AT_name : constants.c
DW_AT_comp_dir : /home/nly99047/sigma/gdb
<1><1ff>: Abbrev Number: 2 (DW_TAG_base_type)
DW_AT_name : (indirect string, offset: 0xbf): unsigned int
DW_AT_byte_size : 4
DW_AT_encoding : 7 (unsigned)
<1><206>: Abbrev Number: 3 (DW_TAG_base_type)
DW_AT_name : unsigned char
DW_AT_byte_size : 1
DW_AT_encoding : 8 (unsigned char)
<1><217>: Abbrev Number: 3 (DW_TAG_base_type)
DW_AT_name : short unsigned int
DW_AT_byte_size : 2
DW_AT_encoding : 7 (unsigned)
<1><22d>: Abbrev Number: 3 (DW_TAG_base_type)
DW_AT_name : long unsigned int
DW_AT_byte_size : 4
DW_AT_encoding : 7 (unsigned)
<1><242>: Abbrev Number: 3 (DW_TAG_base_type)
DW_AT_name : signed char
DW_AT_byte_size : 1
DW_AT_encoding : 6 (signed char)
<1><251>: Abbrev Number: 3 (DW_TAG_base_type)
DW_AT_name : short int
DW_AT_byte_size : 2
DW_AT_encoding : 5 (signed)
<1><25e>: Abbrev Number: 3 (DW_TAG_base_type)
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DW_AT_encoding : 5 (signed)
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DW_AT_encoding : 7 (unsigned)
<1><290>: Abbrev Number: 3 (DW_TAG_base_type)
DW_AT_name : long int
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DW_AT_encoding : 5 (signed)
<1><29c>: Abbrev Number: 2 (DW_TAG_base_type)
DW_AT_name : (indirect string, offset: 0xbf): unsigned int
DW_AT_byte_size : 4
DW_AT_encoding : 7 (unsigned)
<1><2a3>: Abbrev Number: 3 (DW_TAG_base_type)
DW_AT_name : char
DW_AT_byte_size : 1
DW_AT_encoding : 6 (signed char)
<1><2ab>: Abbrev Number: 4 (DW_TAG_typedef)
DW_AT_name : UInt16
DW_AT_decl_file : 1
DW_AT_decl_line : 4
DW_AT_type : <217>
<1><2b9>: Abbrev Number: 5 (DW_TAG_subprogram)
DW_AT_external : 1
DW_AT_name : main
DW_AT_decl_file : 1
DW_AT_decl_line : 12
DW_AT_type : <25e>
DW_AT_low_pc : 0x804841c
DW_AT_high_pc : 0x804847e
DW_AT_frame_base : 1 byte block: 55 (DW_OP_reg5)
<1><2d0>: Abbrev Number: 6 (DW_TAG_namespace)
DW_AT_sibling : <311>
DW_AT_name : ::
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<2><2da>: Abbrev Number: 7 (DW_TAG_variable)
DW_AT_name : c_uint16
DW_AT_decl_file : 1
DW_AT_decl_line : 5
DW_AT_type : <311>
DW_AT_declaration : 1
DW_AT_const_value : 254
<2><2ec>: Abbrev Number: 8 (DW_TAG_variable)
DW_AT_name : g_uint16
DW_AT_decl_file : 1
DW_AT_decl_line : 6
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DW_AT_declaration : 1
<2><2fe>: Abbrev Number: 7 (DW_TAG_variable)
DW_AT_name : c_ushort
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DW_AT_decl_line : 8
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DW_AT_declaration : 1
DW_AT_const_value : 254
<1><311>: Abbrev Number: 9 (DW_TAG_const_type)
DW_AT_type : <2ab>
<1><316>: Abbrev Number: 10 (DW_TAG_variable)
DW_AT_specification: <2da>
DW_AT_location : 5 byte block: 3 96 85 4 8 (DW_OP_addr: 8048596)
<1><321>: Abbrev Number: 10 (DW_TAG_variable)
DW_AT_specification: <2ec>
DW_AT_location : 5 byte block: 3 8 97 4 8 (DW_OP_addr: 8049708)
<1><32c>: Abbrev Number: 9 (DW_TAG_const_type)
DW_AT_type : <217>
<1><331>: Abbrev Number: 10 (DW_TAG_variable)
DW_AT_specification: <2fe>
DW_AT_location : 5 byte block: 3 98 85 4 8 (DW_OP_addr: 8048598)
Compilation Unit @ offset 0x33d:
Length: 140
Version: 2
Abbrev Offset: 241
Pointer Size: 4
<0><348>: Abbrev Number: 1 (DW_TAG_compile_unit)
DW_AT_stmt_list : 0x181
DW_AT_name : /build/buildd/glibc-2.3.6/build-tree/i386-libc/csu/crtn.S
DW_AT_comp_dir : /build/buildd/glibc-2.3.6/build-tree/glibc-2.3.6/csu
DW_AT_producer : GNU AS 2.16.91
DW_AT_language : 32769 (MIPS assembler)
next prev parent reply other threads:[~2007-09-27 10:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-25 14:19 Erik Niessen
2007-09-25 15:57 ` Daniel Jacobowitz
2007-09-26 8:33 ` Erik Niessen
2007-09-26 21:38 ` Daniel Jacobowitz
2007-09-27 11:27 ` Erik Niessen [this message]
2007-09-27 12:15 ` Daniel Jacobowitz
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