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# a6436b0b 18-Aug-2020 Georgii Rymar <[email protected]>

[yaml2obj] - Make the 'Machine' key optional.

Currently we have to set 'Machine' to something in our
YAML descriptions. Usually we use 'EM_X86_64' for 64-bit targets
and 'EM_386' for 32-bit targets.

[yaml2obj] - Make the 'Machine' key optional.

Currently we have to set 'Machine' to something in our
YAML descriptions. Usually we use 'EM_X86_64' for 64-bit targets
and 'EM_386' for 32-bit targets. At the same time, in fact, in most
cases our tests do not need a machine type and we can use
'EM_NONE'.

This is cleaner, because avoids the need of using a particular machine.

In this patch I've made the 'Machine' key optional (the default value,
when it is not specified is `EM_NONE`) and removed it (where possible)
from yaml2obj, obj2yaml and llvm-readobj tests.

There are few tests left where I decided not to remove it, because
I didn't want to touch CHECK lines or doing anything more complex
than a removing a "Machine: *" line and formatting lines around.

Differential revision: https://reviews.llvm.org/D86202

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# f97019ad 04-Aug-2020 Georgii Rymar <[email protected]>

[llvm-readobj/elf] - Add a testing for --stackmap and refine the implementation.

Currently, we only test the `--stackmap` option here:
https://github.com/llvm/llvm-project/blob/master/llvm/test/Obje

[llvm-readobj/elf] - Add a testing for --stackmap and refine the implementation.

Currently, we only test the `--stackmap` option here:
https://github.com/llvm/llvm-project/blob/master/llvm/test/Object/stackmap-dump.test
it uses a precompiled MachO binary currently and I've found no tests for this option for ELF.

The implementation also has issues. For example, it might assert on a wrong version
of the .llvm-stackmaps section. Or it might crash on an empty or truncated section.

This patch introduces a new tools/llvm-readobj/ELF test file as well as implements a few
basic checks to catch simple crashes/issues

It also eliminates `unwrapOrError` calls in `printStackMap()`.

Differential revision: https://reviews.llvm.org/D85208

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