[ORC][ORC_RT][AArch64] Implement TLS descriptor in ELFNixPlatform.

Implements TLS descriptor relocations in JITLink ELF/AARCH64 backend and support the relevant runtime functions in ELFNixPlatform.

[ORC][ORC_RT][AArch64] Implement TLS descriptor in ELFNixPlatform.

Implements TLS descriptor relocations in JITLink ELF/AARCH64 backend and support the relevant runtime functions in ELFNixPlatform.

Unlike traditional TLS model, TLS descriptor model requires linker to return the "offset" from thread pointer via relocaiton not the actual pointer to thread local variable. There is no public libc api for adding new allocations to TLS block dynamically which thread pointer points to. So, we support this by taking delta from thread base pointer to the actual thread local variable in our allocated section.

Reviewed By: lhames

Differential Revision: https://reviews.llvm.org/D128601

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[ORC][ORC_RT] Handle ELF .init_array with non-default priority

ELF-based platforms currently support defining multiple static
initializer table sections with differing priorities, for example
.init_

[ORC][ORC_RT] Handle ELF .init_array with non-default priority

ELF-based platforms currently support defining multiple static
initializer table sections with differing priorities, for example
.init_array.0 or .init_array.100; the default .init_array corresponds
to a priority of 65535. When building a shared library or executable,
the system linker normally sorts these sections and combines them into
a single .init_array section. This change adds the capability to
recognize ELF static initializers with priorities other than the
default, and to properly sort them by priority, to Orc and the Orc
runtime.

Reviewed By: lhames

Differential Revision: https://reviews.llvm.org/D127056

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[ORC-RT][ORC] Handle dynamic unwind registration for libunwind

This changes the ELFNix platform Orc runtime to use, when available,
the __unw_add_dynamic_eh_frame_section interface provided by libun

[ORC-RT][ORC] Handle dynamic unwind registration for libunwind

This changes the ELFNix platform Orc runtime to use, when available,
the __unw_add_dynamic_eh_frame_section interface provided by libunwind
for registering .eh_frame sections loaded by JITLink. When libunwind
is not being used for unwinding, the ELFNix platform detects this and
defaults to the __register_frame interface provided by libgcc_s.

Reviewed By: lhames

Differential Revision: https://reviews.llvm.org/D114961

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[Orc] Support atexit in Orc(JITLink)

There is a bug reported at https://bugs.llvm.org/show_bug.cgi?id=48938

After looking through the glibc, I found the `atexit(f)` is the same as `__cxa_atexit(f,

[Orc] Support atexit in Orc(JITLink)

There is a bug reported at https://bugs.llvm.org/show_bug.cgi?id=48938

After looking through the glibc, I found the `atexit(f)` is the same as `__cxa_atexit(f, NULL, NULL)`. In orc runtime, we identify different JITDylib by their dso_handle value, so that a NULL dso_handle is invalid. So in this patch, I added a `PlatformJDDSOHandle` to ELFNixRuntimeState, and functions which are registered by atexit will be registered at PlatformJD.

Reviewed By: lhames

Differential Revision: https://reviews.llvm.org/D111413

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[ORC-RT] ExecutorAddrDiff ergonomic improvements; contains and overlaps methods

Renames StartAddress and EndAddress members to Start and End.

Adds contains and overlap methods.

Adds a constructor

[ORC-RT] ExecutorAddrDiff ergonomic improvements; contains and overlaps methods

Renames StartAddress and EndAddress members to Start and End.

Adds contains and overlap methods.

Adds a constructor from an address and size.

These changes are counterparts to LLVM commits ef391df2b6332, c0d889995e708, and
37f1b7a3f35fd.

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[ORC-RT] Rename ExecutorAddress to ExecutorAddr.

This is an ORC-runtime counterpart to LLVM commit ef391df2b63, and the
motivation is the same: to move to a shorter name to improve the ergonomics of

[ORC-RT] Rename ExecutorAddress to ExecutorAddr.

This is an ORC-runtime counterpart to LLVM commit ef391df2b63, and the
motivation is the same: to move to a shorter name to improve the ergonomics of
this type before it's more widely adopted.

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[JITLink] Add initial native TLS support to ELFNix platform

This patch use the same way as the https://reviews.llvm.org/rGfe1fa43f16beac1506a2e73a9f7b3c81179744eb to handle the thread local variable

[JITLink] Add initial native TLS support to ELFNix platform

This patch use the same way as the https://reviews.llvm.org/rGfe1fa43f16beac1506a2e73a9f7b3c81179744eb to handle the thread local variable.

It allocates 2 * pointerSize space in GOT to represent the thread key and data address. Instead of using the _tls_get_addr function, I customed a function __orc_rt_elfnix_tls_get_addr to get the address of thread local varible. Currently, this is a wip patch, only one TLS relocation R_X86_64_TLSGD is supported and I need to add the corresponding test cases.

To allocate the TLS descriptor in GOT, I need to get the edge kind information in PerGraphGOTAndPLTStubBuilder, So I add a `Edge::Kind K` argument in some functions in PerGraphGOTAndPLTStubBuilder.h. If it is not suitable, I can think further to solve this problem.

Differential Revision: https://reviews.llvm.org/D109293

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[ORC][ORC-RT] Reapply "Introduce ELF/*nix Platform and runtime..." with fixes.

This reapplies e256445bfff, which was reverted in 45ac5f54418 due to bot errors
(e.g. https://lab.llvm.org/buildbot/#/b

[ORC][ORC-RT] Reapply "Introduce ELF/*nix Platform and runtime..." with fixes.

This reapplies e256445bfff, which was reverted in 45ac5f54418 due to bot errors
(e.g. https://lab.llvm.org/buildbot/#/builders/112/builds/8599). The issue that
caused the bot failure was fixed in 2e6a4fce356.

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[ORC-RT][ORC] Introduce ELF/*nix Platform and runtime support.

This change adds support to ORCv2 and the Orc runtime library for static
initializers, C++ static destructors, and exception handler re

[ORC-RT][ORC] Introduce ELF/*nix Platform and runtime support.

This change adds support to ORCv2 and the Orc runtime library for static
initializers, C++ static destructors, and exception handler registration for
ELF-based platforms, at present Linux and FreeBSD on x86_64. It is based on the
MachO platform and runtime support introduced in bb5f97e3ad1.

Patch by Peter Housel. Thanks very much Peter!

Reviewed By: lhames

Differential Revision: https://reviews.llvm.org/D108081

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