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Sheng Zhou

2010-Apr-26 06:46 UTC

[LLVMdev] Does llvm-gcc emit column # info?

Hi,

I tried llvm-gcc -g -O0 on several cases, but the column field of meta data
always shows zero in created ll code.

Does llvm-gcc emit column # info ? Or I should add some option?

Thanks in advance.


Sheng.
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Duncan Sands

2010-Apr-26 12:13 UTC

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[LLVMdev] Does llvm-gcc emit column # info?

Hi Sheng,
> I tried llvm-gcc -g -O0 on several cases, but the column field of meta
> data always shows zero in created ll code.
>
> Does llvm-gcc emit column # info ? Or I should add some option?
as far as I knowm, llvm-gcc doesn't emit column info because it is based on
gcc-4.2 which has no support for column info.  I think gcc-4.5 has column
info, so the dragonegg plugin (http://dragonegg.llvm.org) could in theory
output column info, though it doesn't right now.

Ciao,

Duncan.

Kecheng

2010-Apr-26 18:02 UTC

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[LLVMdev] Does llvm-gcc emit column # info?

Hi Duncan,

But in the doc "Source Level Debugging with LLVM", it shows that llvm
2.6 could get column number. There's an example in the doc as following:

http://llvm.org/docs/SourceLevelDebugging.html 

1.  void foo() {
2.    int X = 21;
3.    int Y = 22;
4.    {
5.      int Z = 23;
6.      Z = X;
7.    }
8.    X = Y;
9.  }

Compiled to LLVM, this function would be represented like this: 

define void @foo() nounwind ssp {
entry:
  %X = alloca i32, align 4                        ; <i32*> [#uses=4]
  %Y = alloca i32, align 4                        ; <i32*> [#uses=4]
  %Z = alloca i32, align 4                        ; <i32*> [#uses=3]
  %0 = bitcast i32* %X to { }*                    ; <{ }*> [#uses=1]
  call void @llvm.dbg.declare({ }* %0, metadata !0), !dbg !7
  store i32 21, i32* %X, !dbg !8
  %1 = bitcast i32* %Y to { }*                    ; <{ }*> [#uses=1]
  call void @llvm.dbg.declare({ }* %1, metadata !9), !dbg !10
  store i32 22, i32* %Y, !dbg !11
  %2 = bitcast i32* %Z to { }*                    ; <{ }*> [#uses=1]
  call void @llvm.dbg.declare({ }* %2, metadata !12), !dbg !14
  store i32 23, i32* %Z, !dbg !15
  %tmp = load i32* %X, !dbg !16                   ; <i32> [#uses=1]
  %tmp1 = load i32* %Y, !dbg !16                  ; <i32> [#uses=1]
  %add = add nsw i32 %tmp, %tmp1, !dbg !16        ; <i32> [#uses=1]
  store i32 %add, i32* %Z, !dbg !16
  %tmp2 = load i32* %Y, !dbg !17                  ; <i32> [#uses=1]
  store i32 %tmp2, i32* %X, !dbg !17
  ret void, !dbg !18
}
declare void @llvm.dbg.declare({ }*, metadata) nounwind readnone
!0 = metadata !{i32 459008, metadata !1, metadata !"X", 
                metadata !3, i32 2, metadata !6}; [ DW_TAG_auto_variable ]
!1 = metadata !{i32 458763, metadata !2}; [DW_TAG_lexical_block ]
!2 = metadata !{i32 458798, i32 0, metadata !3, metadata !"foo",
metadata !"foo",
               metadata !"foo", metadata !3, i32 1, metadata !4, 
               i1 false, i1 true}; [DW_TAG_subprogram ]
!3 = metadata !{i32 458769, i32 0, i32 12, metadata !"foo.c", 
                metadata !"/private/tmp", metadata !"clang
1.1", i1 true,
                i1 false, metadata !"", i32 0}; [DW_TAG_compile_unit ]
!4 = metadata !{i32 458773, metadata !3, metadata !"", null, i32 0,
i64 0, i64 0,
                i64 0, i32 0, null, metadata !5, i32 0}; [DW_TAG_subroutine_type
]
!5 = metadata !{null}
!6 = metadata !{i32 458788, metadata !3, metadata !"int", metadata !3,
i32 0,
                i64 32, i64 32, i64 0, i32 0, i32 5}; [DW_TAG_base_type ]
!7 = metadata !{i32 2, i32 7, metadata !1, null}
!8 = metadata !{i32 2, i32 3, metadata !1, null}
!9 = metadata !{i32 459008, metadata !1, metadata !"Y", metadata !3,
i32 3,
                metadata !6}; [ DW_TAG_auto_variable ]
!10 = metadata !{i32 3, i32 7, metadata !1, null}
!11 = metadata !{i32 3, i32 3, metadata !1, null}
!12 = metadata !{i32 459008, metadata !13, metadata !"Z", metadata !3,
i32 5,
                 metadata !6}; [ DW_TAG_auto_variable ]
!13 = metadata !{i32 458763, metadata !1}; [DW_TAG_lexical_block ]
!14 = metadata !{i32 5, i32 9, metadata !13, null}
!15 = metadata !{i32 5, i32 5, metadata !13, null}
!16 = metadata !{i32 6, i32 5, metadata !13, null}
!17 = metadata !{i32 8, i32 3, metadata !1, null}
!18 = metadata !{i32 9, i32 1, metadata !2, null}


 We tried the exactly same C code,  but in our's ll file, all coulmn field
are 0. I suspect that we missed some options. Please advise. Thanks. Here's
how we compiled and our ll file:

llvm-gcc -O0 -g -emit-llvm -c t.c -S -o t.ll 


define void @main() nounwind {
entry:
  %X = alloca i32                                 ; <i32*> [#uses=3]
  %Y = alloca i32                                 ; <i32*> [#uses=2]
  %Z = alloca i32                                 ; <i32*> [#uses=2]
  %"alloca point" = bitcast i32 0 to i32          ; <i32>
[#uses=0]
  call void @llvm.dbg.declare(metadata !{i32* %X}, metadata !0), !dbg !7
  call void @llvm.dbg.declare(metadata !{i32* %Y}, metadata !8), !dbg !7
  store i32 21, i32* %X, align 4, !dbg !9
  store i32 22, i32* %Y, align 4, !dbg !10
  call void @llvm.dbg.declare(metadata !{i32* %Z}, metadata !11), !dbg !13
  store i32 23, i32* %Z, align 4, !dbg !14
  %0 = load i32* %X, align 4, !dbg !15            ; <i32> [#uses=1]
  store i32 %0, i32* %Z, align 4, !dbg !15
  %1 = load i32* %Y, align 4, !dbg !16            ; <i32> [#uses=1]
  store i32 %1, i32* %X, align 4, !dbg !16
  br label %return, !dbg !17
return:                                           ; preds = %entry
  ret void, !dbg !17
}
declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
!0 = metadata !{i32 459008, metadata !1, metadata !"X", metadata !3,
i32 2, metadata !6} ; [ DW_TAG_auto_variable ]
!1 = metadata !{i32 458763, metadata !2, i32 0, i32 0} ; [ DW_TAG_lexical_block
]
!2 = metadata !{i32 458798, i32 0, metadata !3, metadata !"main",
metadata !"main", metadata !"main", metadata !3, i32 1,
metadata !4, i1 false, i1 true, i32 0, i32 0, null, i1 false} ; [
DW_TAG_subprogram ]
!3 = metadata !{i32 458769, i32 0, i32 1, metadata !"t.c", metadata
!"/home/kecheng/llvm_test/xyz/", metadata !"4.2.1 (Based on Apple
Inc. build 5658) (LLVM build)", i1 true, i1 false, metadata !"",
i32 0} ; [ DW_TAG_compile_unit ]
!4 = metadata !{i32 458773, metadata !3, metadata !"", metadata !3,
i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !5, i32 0, null} ; [
DW_TAG_subroutine_type ]
!5 = metadata !{null}
!6 = metadata !{i32 458788, metadata !3, metadata !"int", metadata !3,
i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
!7 = metadata !{i32 1, i32 0, metadata !1, null}
!8 = metadata !{i32 459008, metadata !1, metadata !"Y", metadata !3,
i32 3, metadata !6} ; [ DW_TAG_auto_variable ]
!9 = metadata !{i32 2, i32 0, metadata !1, null}
!10 = metadata !{i32 3, i32 0, metadata !1, null}
!11 = metadata !{i32 459008, metadata !12, metadata !"Z", metadata !3,
i32 5, metadata !6} ; [ DW_TAG_auto_variable ]
!12 = metadata !{i32 458763, metadata !1, i32 0, i32 0} ; [ DW_TAG_lexical_block
]
!13 = metadata !{i32 3, i32 0, metadata !12, null}
!14 = metadata !{i32 5, i32 0, metadata !12, null}
!15 = metadata !{i32 6, i32 0, metadata !12, null}
!16 = metadata !{i32 8, i32 0, metadata !1, null}
!17 = metadata !{i32 9, i32 0, metadata !1, null}








Kecheng
2010-04-26



From： Duncan Sands
Date： 2010-04-26 05:14:19
To： llvmdev
Cc： 
Subject： Re: [LLVMdev] Does llvm-gcc emit column # info?

Hi Sheng,> I tried llvm-gcc -g -O0 on several cases, but the column field of meta
> data always shows zero in created ll code.
>
> Does llvm-gcc emit column # info ? Or I should add some option?as far as I knowm, llvm-gcc doesn't emit column info because it is based on
gcc-4.2 which has no support for column info.  I think gcc-4.5 has column
info, so the dragonegg plugin (http://dragonegg.llvm.org) could in theory
output column info, though it doesn't right now.
Ciao,
Duncan.
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Duncan Sands

2010-Apr-27 12:03 UTC

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[LLVMdev] Does llvm-gcc emit column # info?

Hi Kecheng,
> But in the doc "Source Level Debugging with LLVM", it shows that
llvm
> 2.6 could get column number. There's an example in the doc as
following:
> http://llvm.org/docs/SourceLevelDebugging.html
you are confusing what LLVM supports, and what a particular LLVM frontend
(llvm-gcc) produces.  LLVM supports column numbers, but llvm-gcc does not
generate them.  I think clang does however.  Note that the document you cite
does not say that llvm-gcc produces the example output.

Ciao,

Duncan.

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