[llvm] ac15cd7 - Modified SourceLevelDebugging.rst to include information about memory location exp

[Philip Reames via llvm-commits]

It looks like you pushed an entire stack of changes from a review 
instead of squashing into a single commit.  Please revert all of these, 
squash, and then precommit with an appropriate review message.

Philip

On 2/10/22 12:25, YASHASVI KHATAVKAR via llvm-commits wrote:
> Author: YASHASVI KHATAVKAR
> Date: 2022-02-10T15:24:51-05:00
> New Revision: ac15cd7af6150cc7de4eb29526070ff48c0ae437
>
> URL: https://github.com/llvm/llvm-project/commit/ac15cd7af6150cc7de4eb29526070ff48c0ae437
> DIFF: https://github.com/llvm/llvm-project/commit/ac15cd7af6150cc7de4eb29526070ff48c0ae437.diff
>
> LOG: Modified SourceLevelDebugging.rst to include information about memory location exp
>
> Added:
>      
>
> Modified:
>      llvm/docs/SourceLevelDebugging.rst
>
> Removed:
>      
>
>
> ################################################################################
> diff  --git a/llvm/docs/SourceLevelDebugging.rst b/llvm/docs/SourceLevelDebugging.rst
> index e4a529d0e242..bdc55e5bcfec 100644
> --- a/llvm/docs/SourceLevelDebugging.rst
> +++ b/llvm/docs/SourceLevelDebugging.rst
> @@ -1087,6 +1087,10 @@ a Fortran front-end would generate the following descriptors:
>     !DILocalVariable(name: "string", arg: 1, scope: !10, file: !3, line: 4, type: !15)
>     !DIStringType(name: "character(*)!2", stringLength: !16, stringLengthExpression: !DIExpression(), size: 32)
>   
> +A fortran deferred-length character can also contain the information of raw storage of the characters in addition to the length of the string. This information is encoded in the  stringLocationExpression field. Based on this information, DW_AT_data_location attribute is emitted in a DW_TAG_string_type debug info.
> +
> +  !DIStringType(name: "character(*)!2", stringLengthExpression: !DIExpression(), stringLocationExpression: !DIExpression(DW_OP_push_object_address, DW_OP_deref), size: 32)
> +
>   and this will materialize in DWARF tags as:
>   
>   .. code-block:: text
> @@ -1097,6 +1101,7 @@ and this will materialize in DWARF tags as:
>      0x00000064:    DW_TAG_variable
>                     DW_AT_location      (DW_OP_fbreg +16)
>                     DW_AT_type  (0x00000083 "integer*8")
> +                  DW_AT_data_location (DW_OP_push_object_address, DW_OP_deref)
>                     ...
>                     DW_AT_artificial    (true)
>   
>
>
>          
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