llvm dev - Feb 2013 - [LLVMdev] llvm get globals definition line number

Hello,

I followed the
http://stackoverflow.com/questions/13852180/how-to-get-variable-definition-line-number-etc-using-dbg-metadatain
order to get the line number definition for local variables (allocas),
which works fine. But I need the same for globals. So I tried to hack the
`findDbgGlobalDeclare()` method from
http://llvm.org/docs/doxygen/html/DbgInfoPrinter_8cpp_source.html#l00062 .
However, I have no `llvm.dbg.gv` in my bytecode, so there is no dbg info to
extract. I compile my target code using `clang++ -O0 -g -emit-llvm Test.cpp
-c -o Test.bc` . Some samples from my bytecode:

    @r = global i32 3, align 4
    %4 = load i32* @r, align 4, !dbg !942
    ...
    %a = alloca i32, align 4
    %1 = load i32* %a, align 4, !dbg !939

Thank you !
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However, I do have:

    !924 = metadata !{i32 786484, i32 0, null, metadata !"r", metadata
!"r", metadata !"", metadata !841, i32 19, metadata !56, i32
0, i32 1, i32*
@r} ; [ DW_TAG_variable ] [r] [line 19] [def]

with on which `!0` is indirectly dependent and there is `!llvm.dbg.cu !{!0}` .


On Wed, Feb 27, 2013 at 11:35 AM, Alexandru Ionut Diaconescu <
alexandruionutdiaconescu at gmail.com> wrote:
> Hello,
>
> I followed the
>
http://stackoverflow.com/questions/13852180/how-to-get-variable-definition-line-number-etc-using-dbg-metadatain
order to get the line number definition for local variables (allocas),
> which works fine. But I need the same for globals. So I tried to hack the
> `findDbgGlobalDeclare()` method from
> http://llvm.org/docs/doxygen/html/DbgInfoPrinter_8cpp_source.html#l00062.
However, I have no `llvm.dbg.gv` in my bytecode, so there is no dbg info
> to extract. I compile my target code using `clang++ -O0 -g -emit-llvm
> Test.cpp -c -o Test.bc` . Some samples from my bytecode:
>
>     @r = global i32 3, align 4
>     %4 = load i32* @r, align 4, !dbg !942
>     ...
>     %a = alloca i32, align 4
>     %1 = load i32* %a, align 4, !dbg !939
>
> Thank you !



-- 
Best regards,
Alexandru Ionut Diaconescu
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On Wed, Feb 27, 2013 at 2:53 AM, Alexandru Ionut Diaconescu
<alexandruionutdiaconescu at gmail.com> wrote:
> However, I do have:
>
>     !924 = metadata !{i32 786484, i32 0, null, metadata !"r",
metadata !"r",
> metadata !"", metadata !841, i32 19, metadata !56, i32 0, i32 1,
i32* @r} ;
> [ DW_TAG_variable ] [r] [line 19] [def]
>
> with on which `!0` is indirectly dependent and there is `!llvm.dbg.cu >
!{!0}` .
Right, the modern debug info metadata format stores the list of
globals in the last (optional) field of the compile_unit description

http://llvm.org/docs/SourceLevelDebugging.html#compile-unit-descriptors
>
>
>
> On Wed, Feb 27, 2013 at 11:35 AM, Alexandru Ionut Diaconescu
> <alexandruionutdiaconescu at gmail.com> wrote:
>>
>> Hello,
>>
>> I followed the
>>
http://stackoverflow.com/questions/13852180/how-to-get-variable-definition-line-number-etc-using-dbg-metadata
>> in order to get the line number definition for local variables
(allocas),
>> which works fine. But I need the same for globals. So I tried to hack
the
>> `findDbgGlobalDeclare()` method from
>>
http://llvm.org/docs/doxygen/html/DbgInfoPrinter_8cpp_source.html#l00062 .
>> However, I have no `llvm.dbg.gv` in my bytecode, so there is no dbg
info to
>> extract. I compile my target code using `clang++ -O0 -g -emit-llvm
Test.cpp
>> -c -o Test.bc` . Some samples from my bytecode:
>>
>>     @r = global i32 3, align 4
>>     %4 = load i32* @r, align 4, !dbg !942
>>     ...
>>     %a = alloca i32, align 4
>>     %1 = load i32* %a, align 4, !dbg !939
>>
>> Thank you !
>
>
>
>
> --
> Best regards,
> Alexandru Ionut Diaconescu
>
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