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# 7afd0521 26-Jan-2022 Pavel Labath <pavel@labath.sk>

[lldb/DWARF] Make manual dwarf index deterministic

Currently, running the test suite with LLVM_ENABLE_EXPENSIVE_CHECKS=On
causes a couple of tests to fail. This happens because they expect a
certain

[lldb/DWARF] Make manual dwarf index deterministic

Currently, running the test suite with LLVM_ENABLE_EXPENSIVE_CHECKS=On
causes a couple of tests to fail. This happens because they expect a
certain order of variables (all of them happen to use the "target
variable" command, but other lookup functions should suffer from the
same issues), all of which have the same name. Sort algorithms often
preserve the order of equivalent elements (in this case the entries in
the NameToDIE map), but that not guaranteed, and
LLVM_ENABLE_EXPENSIVE_CHECKS stresses that by pre-shuffling all inputs
before sorting.

While this could easily be fixed by relaxing the test expectations,
having a deterministic output seems like a worthwhile goal,
particularly, as this could have bigger consequences than just a
different print order -- in some cases we just pick the first entry that
we find, whatever that is. Therefore this patch makes the sort
deterministic by introducing another sort key -- UniqueCString::Sort
gets a value comparator functor, which can be used to sort elements with
the same name -- in the DWARF case we use DIERef::operator<, which
roughly equals the order in which the entries appear in the debug info,
and matches the current "accidental" order.

Using a extra functor seemed preferable to using stable_sort, as the
latter allocates extra O(n) of temporary memory.

I observed no difference in debug info parsing speed with this patch
applied.

Differential Revision: https://reviews.llvm.org/D118251

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Revision tags: llvmorg-13.0.1, llvmorg-13.0.1-rc3, llvmorg-13.0.1-rc2, llvmorg-13.0.1-rc1, llvmorg-13.0.0, llvmorg-13.0.0-rc4, llvmorg-13.0.0-rc3, llvmorg-13.0.0-rc2, llvmorg-13.0.0-rc1, llvmorg-14-init, llvmorg-12.0.1, llvmorg-12.0.1-rc4, llvmorg-12.0.1-rc3, llvmorg-12.0.1-rc2, llvmorg-12.0.1-rc1, llvmorg-12.0.0, llvmorg-12.0.0-rc5, llvmorg-12.0.0-rc4, llvmorg-12.0.0-rc3, llvmorg-12.0.0-rc2, llvmorg-11.1.0, llvmorg-11.1.0-rc3, llvmorg-12.0.0-rc1, llvmorg-13-init, llvmorg-11.1.0-rc2, llvmorg-11.1.0-rc1, llvmorg-11.0.1, llvmorg-11.0.1-rc2, llvmorg-11.0.1-rc1, llvmorg-11.0.0, llvmorg-11.0.0-rc6, llvmorg-11.0.0-rc5, llvmorg-11.0.0-rc4, llvmorg-11.0.0-rc3, llvmorg-11.0.0-rc2, llvmorg-11.0.0-rc1, llvmorg-12-init, llvmorg-10.0.1, llvmorg-10.0.1-rc4, llvmorg-10.0.1-rc3, llvmorg-10.0.1-rc2, llvmorg-10.0.1-rc1, llvmorg-10.0.0, llvmorg-10.0.0-rc6, llvmorg-10.0.0-rc5, llvmorg-10.0.0-rc4, llvmorg-10.0.0-rc3, llvmorg-10.0.0-rc2, llvmorg-10.0.0-rc1
# 80814287 24-Jan-2020 Raphael Isemann <teemperor@gmail.com>

[lldb][NFC] Fix all formatting errors in .cpp file headers

Summary:
A *.cpp file header in LLDB (and in LLDB) should like this:
```
//===-- TestUtilities.cpp ----------------------------------------

[lldb][NFC] Fix all formatting errors in .cpp file headers

Summary:
A *.cpp file header in LLDB (and in LLDB) should like this:
```
//===-- TestUtilities.cpp -------------------------------------------------===//
```
However in LLDB most of our source files have arbitrary changes to this format and
these changes are spreading through LLDB as folks usually just use the existing
source files as templates for their new files (most notably the unnecessary
editor language indicator `-*- C++ -*-` is spreading and in every review
someone is pointing out that this is wrong, resulting in people pointing out that this
is done in the same way in other files).

This patch removes most of these inconsistencies including the editor language indicators,
all the different missing/additional '-' characters, files that center the file name, missing
trailing `===//` (mostly caused by clang-format breaking the line).

Reviewers: aprantl, espindola, jfb, shafik, JDevlieghere

Reviewed By: JDevlieghere

Subscribers: dexonsmith, wuzish, emaste, sdardis, nemanjai, kbarton, MaskRay, atanasyan, arphaman, jfb, abidh, jsji, JDevlieghere, usaxena95, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D73258

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Revision tags: llvmorg-11-init, llvmorg-9.0.1, llvmorg-9.0.1-rc3, llvmorg-9.0.1-rc2, llvmorg-9.0.1-rc1, llvmorg-9.0.0, llvmorg-9.0.0-rc6, llvmorg-9.0.0-rc5, llvmorg-9.0.0-rc4, llvmorg-9.0.0-rc3, llvmorg-9.0.0-rc2, llvmorg-9.0.0-rc1, llvmorg-10-init, llvmorg-8.0.1, llvmorg-8.0.1-rc4, llvmorg-8.0.1-rc3
# d8aca888 14-Jun-2019 Pavel Labath <pavel@labath.sk>

Make UniqueCStringMap work with non-default-constructible types and other improvements/cleanups

Summary:
The motivation for this was me wanting to make the validity of dwarf
DIERefs explicit (via ll

Make UniqueCStringMap work with non-default-constructible types and other improvements/cleanups

Summary:
The motivation for this was me wanting to make the validity of dwarf
DIERefs explicit (via llvm::Optional<DIERef>). This meant that the class
would no longer have a default constructor. As the DIERef was being
stored in a UniqueCStringMap, this meant that this container (like all
standard containers) needed to work with non-default-constructible types
too.

This part is achieved by removing the default constructors for the map
entry types, and providing appropriate comparison overloads so that we
can search for map entries without constructing a dummy entry. While
doing that, I took the opportunity to modernize the code, and add some
tests. Functions that were completely unused are deleted.

This required also some changes in the Symtab code, as it was default
constructing map entries, which was not impossible even though its
value type was default-constructible. Technically, these changes could
be avoided with some SFINAE on the entry type, but I felt that the code
is cleaner this way anyway.

Reviewers: JDevlieghere, sgraenitz

Subscribers: mgorny, aprantl, lldb-commits

Differential Revision: https://reviews.llvm.org/D63268

llvm-svn: 363357

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