[PATCH] D125783: [llvm-debuginfo-analyzer] 08 - ELF Reader
Carlos Alberto Enciso via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Oct 14 12:47:45 PDT 2022
CarlosAlbertoEnciso added inline comments.
================
Comment at: llvm/lib/DebugInfo/LogicalView/Readers/LVELFReader.cpp:692
+ if (options().getPrintSizes() && Upper)
+ CompileUnit->addSize(Scope, Lower, Upper);
+ }
----------------
probinson wrote:
> CarlosAlbertoEnciso wrote:
> > probinson wrote:
> > > It looks like Upper will not include the size of the last child?
> > I debugged the code using the following DWARF test case:
> > ```
> > 0x0000000b: DW_TAG_compile_unit
> > 0x0000002d: DW_TAG_variable
> > 0x00000043: DW_TAG_base_type
> > 0x0000004a: DW_TAG_variable
> > 0x00000060: DW_TAG_subprogram
> > 0x00000077: DW_TAG_subprogram
> > 0x00000092: DW_TAG_formal_parameter
> > 0x000000a1: DW_TAG_formal_parameter
> > 0x000000b0: NULL
> > 0x000000b1: DW_TAG_subprogram
> > 0x000000cf: DW_TAG_subprogram
> > 0x000000f5: DW_TAG_formal_parameter
> > 0x00000103: DW_TAG_formal_parameter
> > 0x00000111: DW_TAG_variable
> > 0x00000120: DW_TAG_variable
> > 0x0000012f: DW_TAG_lexical_block
> > 0x00000140: DW_TAG_variable
> > 0x0000014f: DW_TAG_variable
> > 0x0000015e: NULL
> > 0x0000015f: NULL
> > 0x00000160: DW_TAG_subprogram
> > 0x00000186: DW_TAG_formal_parameter
> > 0x00000195: NULL
> > 0x00000196: DW_TAG_subprogram
> > 0x000001b8: DW_TAG_formal_parameter
> > 0x000001c7: NULL
> > 0x000001c8: NULL
> > ```
> > These are the `Lower` and `Upper` values for each logical scope, in the order they are recorded in the compile unit.
> > ```
> > Offset Lower Upper
> > 0x00000060: DW_TAG_subprogram 0x060 0x077
> > 0x00000077: DW_TAG_subprogram 0x077 0x0b0
> > 0x000000b1: DW_TAG_subprogram 0x0b1 0x0cf
> > 0x0000012f: DW_TAG_lexical_block 0x12f 0x15e
> > 0x000000cf: DW_TAG_subprogram 0x0cf 0x15f
> > 0x00000160: DW_TAG_subprogram 0x160 0x195
> > 0x00000196: DW_TAG_subprogram 0x196 0x1c7
> > 0x0000000b: DW_TAG_compile_unit 0x00b 0x1c8
> > ```
> > Looking at that table, it seems that `Upper` is including the size of the last child.
> > May be I am missing something?
> No, my misunderstanding.
Thanks
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D125783/new/
https://reviews.llvm.org/D125783
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