kamleshbhalui added a comment.
In D103131#2815386 <https://reviews.llvm.org/D103131#2815386>, @probinson wrote:
>>> 0x0000002a: DW_TAG_variable
>>> DW_AT_name ("oldname")
>>> DW_AT_type (0x0000003f "int")
>>> DW_AT_external (true)
>>> DW_AT_decl_file
>>> ("/folk/kkumar/tcllvm/llvm-build-lldb-rel/bin/test.c")
>>> DW_AT_decl_line (1)
>>> DW_AT_location (DW_OP_addr 0x0)
>>>
>>> 0x0000003f: DW_TAG_base_type
>>> DW_AT_name ("int")
>>> DW_AT_encoding (DW_ATE_signed)
>>> DW_AT_byte_size (0x04)
>>>
>>> 0x00000046: DW_TAG_variable
>>> DW_AT_name ("newname")
>>> DW_AT_type (0x0000003f "int")
>>> DW_AT_decl_file
>>> ("/folk/kkumar/tcllvm/llvm-build-lldb-rel/bin/test.c")
>>> DW_AT_decl_line (2)
>>> DW_AT_declaration (true)
>>>
>>> 0x00000051: DW_TAG_imported_declaration
>>> DW_AT_decl_file
>>> ("/folk/kkumar/tcllvm/llvm-build-lldb-rel/bin/test.c")
>>> DW_AT_decl_line (2)
>>> DW_AT_import (0x00000046)
>>> DW_AT_name ("newname")
>
> I agree with David, this sequence doesn't seem to do what's desired.
> There's nothing that ties "newname" to "oldname" here. What you
> want is something more like this:
>
> 0x0000002a: DW_TAG_variable
> DW_AT_name ("oldname")
> ...
> 0x0000003a: DW_TAG_imported_declaration
> DW_AT_import (0x0000002a)
> DW_AT_name ("newname")
>
> That is, there would not be a separate DW_TAG_variable for "newname";
> instead, the imported_declaration would import the DIE for "oldname"
> giving it the name "newname".
>
> --paulr
Even this does not work with gdb.
Here is what gdb says,
(gdb) ptype newname
type = <data variable, no debug info>
(gdb) p newname
'newname' has unknown type; cast it to its declared type
(gdb) p oldname
$1 = 1
(gdb) ptype oldname
type = int
(gdb)
--------------
dumped debug info (using llvm-dwarfdump)
test.o: file format elf64-x86-64
.debug_info contents:
0x00000000: Compile Unit: length = 0x00000067, format = DWARF32, version =
0x0004, abbr_offset = 0x0000, addr_size = 0x08 (next unit at 0x0000006b)
0x0000000b: DW_TAG_compile_unit
DW_AT_producer ("clang version 13.0.0
(g...@github.com:llvm/llvm-project.git
4cd7169f5517167ef456e82c6dcae669bde6c725)")
DW_AT_language (DW_LANG_C99)
DW_AT_name ("test.c")
DW_AT_stmt_list (0x00000000)
DW_AT_comp_dir
("/folk/kkumar/tcllvm/llvm-build-lldb-rel/bin")
DW_AT_low_pc (0x0000000000000000)
DW_AT_high_pc (0x0000000000000008)
0x0000002a: DW_TAG_variable
DW_AT_name ("oldname")
DW_AT_type (0x0000003f "int")
DW_AT_external (true)
DW_AT_decl_file
("/folk/kkumar/tcllvm/llvm-build-lldb-rel/bin/test.c")
DW_AT_decl_line (1)
DW_AT_location (DW_OP_addr 0x0)
0x0000003f: DW_TAG_base_type
DW_AT_name ("int")
DW_AT_encoding (DW_ATE_signed)
DW_AT_byte_size (0x04)
0x00000046: DW_TAG_imported_declaration
DW_AT_decl_file
("/folk/kkumar/tcllvm/llvm-build-lldb-rel/bin/test.c")
DW_AT_decl_line (2)
DW_AT_import (0x0000002a)
DW_AT_name ("newname")
0x00000051: DW_TAG_subprogram
DW_AT_low_pc (0x0000000000000000)
DW_AT_high_pc (0x0000000000000008)
DW_AT_frame_base (DW_OP_reg6 RBP)
DW_AT_name ("main")
DW_AT_decl_file
("/folk/kkumar/tcllvm/llvm-build-lldb-rel/bin/test.c")
DW_AT_decl_line (3)
DW_AT_type (0x0000003f "int")
DW_AT_external (true)
0x0000006a: NULL
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D103131/new/
https://reviews.llvm.org/D103131
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