[Bug translator/4915] Incorrect code for accessing function argument

["wcohen at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From wcohen at redhat dot com  2007-08-10 21:43 -------
Got the raw dwarf information using the following commands:

readelf --debug-dump  /tmp/stap_rhel4/vmlinux-2.6.23-rc2 >
/tmp/stap_rhel4/vmlinux-2.6.23-rc2.debug_info
readelf --debug-dump /boot/vmlinux-2.6.23-rc2  >
/tmp/stap_rhel5/vmlinux-2.6.23-rc2.debug_info

It looks like the RHEL4 gcc compiler is generating some questionable debuginfo.

RHEL4 version
 <1><61d544>: Abbrev Number: 83 (DW_TAG_subprogram)
     DW_AT_sibling     : <61d59c>
     DW_AT_external    : 1
     DW_AT_name        : (indirect string, offset: 0x393cc): sys_open
     DW_AT_decl_file   : 1
     DW_AT_decl_line   : 1048
     DW_AT_prototyped  : 1
     DW_AT_type        : <610a64>
     DW_AT_low_pc      : 0xc017384f
     DW_AT_high_pc     : 0xc017386b
     DW_AT_frame_base  : 2 byte block: 74 4     (DW_OP_breg4: 4)
 <2><61d561>: Abbrev Number: 84 (DW_TAG_formal_parameter)
     DW_AT_name        : (indirect string, offset: 0x510e3): filename
     DW_AT_decl_file   : 1
     DW_AT_decl_line   : 1047
     DW_AT_type        : <61121a>
     DW_AT_location    : 1 byte block: 52       (DW_OP_reg2)
 <2><61d56f>: Abbrev Number: 84 (DW_TAG_formal_parameter)
     DW_AT_name        : (indirect string, offset: 0xcdf17): flags
     DW_AT_decl_file   : 1
     DW_AT_decl_line   : 1047
     DW_AT_type        : <610a35>
     DW_AT_location    : 1 byte block: 51       (DW_OP_reg1)
 <2><61d57d>: Abbrev Number: 84 (DW_TAG_formal_parameter)
     DW_AT_name        : (indirect string, offset: 0x5c9): mode
     DW_AT_decl_file   : 1
     DW_AT_decl_line   : 1047
     DW_AT_type        : <610a35>
     DW_AT_location    : 1 byte block: 50       (DW_OP_reg0)
 <2><61d58b>: Abbrev Number: 91 (DW_TAG_variable)
     DW_AT_name        : ret
     DW_AT_decl_file   : 1
     DW_AT_decl_line   : 1049
     DW_AT_type        : <610a64>
     DW_AT_location    : 0xa6de1        (location list)


RHEL5
 <1><65ecd8>: Abbrev Number: 83 (DW_TAG_subprogram)
     DW_AT_sibling     : <65ed34>
     DW_AT_external    : 1
     DW_AT_name        : (indirect string, offset: 0x3982d): sys_open
     DW_AT_decl_file   : 1
     DW_AT_decl_line   : 1048
     DW_AT_prototyped  : 1
     DW_AT_type        : <652c64>
     DW_AT_low_pc      : 0xc046ca3b
     DW_AT_high_pc     : 0xc046ca59
     DW_AT_frame_base  : 0x9402e        (location list)
 <2><65ecf6>: Abbrev Number: 89 (DW_TAG_formal_parameter)
     DW_AT_name        : (indirect string, offset: 0x51af4): filename
     DW_AT_decl_file   : 1
     DW_AT_decl_line   : 1047
     DW_AT_type        : <6533b6>
     DW_AT_location    : 2 byte block: 91 0     (DW_OP_fbreg: 0)
 <2><65ed05>: Abbrev Number: 89 (DW_TAG_formal_parameter)
     DW_AT_name        : (indirect string, offset: 0xd60b6): flags
     DW_AT_decl_file   : 1
     DW_AT_decl_line   : 1047
     DW_AT_type        : <652c35>
     DW_AT_location    : 2 byte block: 91 4     (DW_OP_fbreg: 4)
 <2><65ed14>: Abbrev Number: 89 (DW_TAG_formal_parameter)
     DW_AT_name        : (indirect string, offset: 0x836d): mode
     DW_AT_decl_file   : 1
     DW_AT_decl_line   : 1047
     DW_AT_type        : <652c35>
     DW_AT_location    : 2 byte block: 91 8     (DW_OP_fbreg: 8)
 <2><65ed23>: Abbrev Number: 95 (DW_TAG_variable)
     DW_AT_name        : ret
     DW_AT_decl_file   : 1
     DW_AT_decl_line   : 1049
     DW_AT_type        : <652c64>
     DW_AT_location    : 0x9404e        (location list)



-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=4915

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