[LLVMdev] Accessing structure members of .omp_data_i

[Ashay Rane]

Hello,

I want to find out the member variable of the structure (.omp_data_i) being
accessed but the metadata and the use don't seem to be linked.

Here's is a portion of the IR generated for a function containing an OpenMP
pragma:

define internal void @bpnn_adjust_weights.omp_fn.0(i8* nocapture
%.omp_data_i) nounwind uwtable {
entry:
  %0 = getelementptr inbounds i8* %.omp_data_i, i64 36, !dbg !535
  %1 = bitcast i8* %0 to i32*, !dbg !535
  %2 = load i32* %1, align 4, !dbg !535, !tbaa !348


Here's the debug metadata:

!236 = metadata !{i32 655617, metadata !52, metadata !".omp_data_i",
metadata !1, i32 316, metadata !237, i32 0, i32 0}
!237 = metadata !{i32 655375, metadata !1, metadata !"", metadata !1, i32
0, i64 64, i64 64, i64 0, i32 64, metadata !238}
!238 = metadata !{i32 655379, metadata !1, metadata !".omp_data_s.18",
metadata !1, i32 0, i64 320, i64 64, i64 0, i32 0, null, metadata !239, i32
0, null}
!239 = metadata !{metadata !240, metadata !241, metadata !242, metadata
!243, metadata !244, metadata !245}
!240 = metadata !{i32 655373, metadata !238, metadata !"ly", metadata !1,
i32 306, i64 64, i64 64, i64 0, i32 0, metadata !11}
...


The problem is that there is no llvm.dbg.declare() or llvm.dbg.value() call
that links the use of .omp_data_i to the debug metadata. Instead, the
following statement is present (as I understand, to list the local
variables of the function).

!llvm.dbg.lv.bpnn_adjust_weights.omp_fn.0 = !{!236, !246, !247, !248, !249,
!250}


Is there any API call to find out the local variables of the function? I
would like to know which member variable is being accessed in the `load'
statement but there appears to be no way to relate the %.omp_data_i to
{!236}.

I am using LLVM 3.1 with dragonegg 3.1. The file is being compiled with the
following line:
gcc -fplugin=dragonegg.so -flto -emit-llvm -g -S backprop.c -g -O2 -fopenmp
-o backprop.o.bc

Ashay
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