[lld] r227711 - [test] Add test for section groups and deadstrip

[Rafael Espíndola]

I think this is testing for a gnu ld bug/limitation:

With the attached testcase, gnu ld keeps zed and bar. Gold keeps only bar.

lld keeps _start, bad, zed and produces wrong bindings :-(


On 1 February 2015 at 00:47, Shankar Easwaran <shankare at codeaurora.org> wrote:
> Author: shankare
> Date: Sat Jan 31 23:47:02 2015
> New Revision: 227711
>
> URL: http://llvm.org/viewvc/llvm-project?rev=227711&view=rev
> Log:
> [test] Add test for section groups and deadstrip
>
> This adds a test that deadstrip should preserve the section group even if there
> is only one reference to a function in the group.
>
> Added:
>     lld/trunk/test/core/sectiongroup-deadstrip.objtxt
>
> Added: lld/trunk/test/core/sectiongroup-deadstrip.objtxt
> URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/core/sectiongroup-deadstrip.objtxt?rev=227711&view=auto
> ==============================================================================
> --- lld/trunk/test/core/sectiongroup-deadstrip.objtxt (added)
> +++ lld/trunk/test/core/sectiongroup-deadstrip.objtxt Sat Jan 31 23:47:02 2015
> @@ -0,0 +1,92 @@
> +# Test for section group members be preserved even if there is a
> +# reference to only one functions in the group.
> +# RUN: lld -core --dead-strip %s | FileCheck %s
> +
> +#
> +# Test that section groups are parsed properly when there is a reference to a
> +# group atom from outside a group.
> +#
> +
> +---
> +defined-atoms:
> +  - name:         entry
> +    dead-strip:   never
> +    references:
> +    - offset:          1
> +      kind:            pcrel32
> +      target:          d1
> +  - name:            f1
> +    scope:           global
> +    type:            code
> +  - name:            f2
> +    scope:           global
> +    type:            code
> +  - name:            g1
> +    scope:           global
> +    type:            code
> +  - name:            d1
> +    scope:           global
> +    type:            data
> +  - name:            g1
> +    scope:           global
> +    type:            group-comdat
> +    references:
> +      - kind:            group-child
> +        target:          f1
> +      - kind:            group-child
> +        target:          f2
> +      - kind:            group-child
> +        target:          d1
> +      - kind:            group-child
> +        target:          g1
> +  - name:            anotherfunction
> +    scope:           global
> +    type:            data
> +    references:
> +      - kind:            layout-before
> +        target:          f1
> +---
> +undefined-atoms:
> +    - name:              f1
> +      can-be-null:       never
> +...
> +
> +#CHECK: defined-atoms:
> +#CHECK:   - name:            g1
> +#CHECK:     ref-name:        [[PARENT:[a-zA-Z\.0-9_]+]]
> +#CHECK:     scope:           global
> +#CHECK:     type:            group-comdat
> +#CHECK:     references:
> +#CHECK:       - kind:            group-child
> +#CHECK:         offset:          0
> +#CHECK:         target:          [[GCHILDONE:[a-zA-Z\.0-9_]+]]
> +#CHECK:       - kind:            group-child
> +#CHECK:         offset:          0
> +#CHECK:         target:          [[GCHILDTWO:[a-zA-Z\.0-9_]+]]
> +#CHECK:       - kind:            group-child
> +#CHECK:         offset:          0
> +#CHECK:         target:          [[GCHILDTHREE:[a-zA-Z\.0-9_]+]]
> +#CHECK:       - kind:            group-child
> +#CHECK:         offset:          0
> +#CHECK:         target:          [[GCHILDFOUR:[a-zA-Z\.0-9_]+]]
> +#CHECK:   - name:            f1
> +#CHECK:     ref-name:        [[GCHILDONE]]
> +#CHECK:     scope:           global
> +#CHECK:   - name:            f2
> +#CHECK:     ref-name:        [[GCHILDTWO]]
> +#CHECK:     scope:           global
> +#CHECK:   - name:            d1
> +#CHECK:     ref-name:        [[GCHILDTHREE]]
> +#CHECK:     scope:           global
> +#CHECK:     type:            data
> +#CHECK:   - name:            g1
> +#CHECK:     ref-name:        [[GCHILDFOUR]]
> +#CHECK:     scope:           global
> +#CHECK:   - name:            anotherfunction
> +#CHECK:     scope:           global
> +#CHECK:     type:            data
> +#CHECK:     references:
> +#CHECK:       - kind:            layout-before
> +#CHECK:         offset:          0
> +#CHECK:         target:          [[GCHILDONE]]
> +#CHECK: ...
>
>
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