This reapplies commits 462251b80b7 and 9b67c99dc5b, which were reverted in
53d35c4e86b due to bot failures for the wrapper_function_utils_test.cpp unit
test.
This decouples function argument serialization / deserialization from the
function call dispatch mechanism. This will eventually allow us to replace the
existing __orc_rt_jit_dispatch function with a system that supports pre-linking
parts of the ORC runtime into the executor.
We should use `orc_rt` as the public C++ API namespace for the ORC runtime and
control symbol visibility to hide implementation details, rather than rely on
the '__' prefix.
This fixes:
```
C:\git\llvm-project\compiler-rt\lib\orc\coff_platform.cpp(512): warning C4189: 'JDState': local variable is initialized but not referenced
```
The '__' prefix should only be used for the parts of the ORC runtime that
implement compiler / loader runtime details (e.g. ORC-RT's __tlv_get_addr
implementations).
This patch only fixes the public API. Future changes will fix internal names.
Supports dynamic VC runtime. It implements atexits handling which is required to load msvcrt.lib successfully. (the object file containing atexit symbol somehow resolves to static vc runtim symbols) It also default to dynamic vc runtime which tends to be more robust.
Reviewed By: lhames
Differential Revision: https://reviews.llvm.org/D132525
Mingw headers are all lowercase, and can be used for cross compilation
from case sensitive file systems.
The official Windows SDK headers aren't self-consistent wrt upper/lower
case, so those headers can't be used on case sensitive systems without
a layer providing case insensitivity anyway.
This matches other includes of windows.h throughout the codebase.
Initial platform support for COFF/x86_64.
Completed features:
* Statically linked orc runtime.
* Full linking/initialization of static/dynamic vc runtimes and microsoft stl libraries.
* SEH exception handling.
* Full static initializers support
* dlfns
* JIT side symbol lookup/dispatch
Things to note:
* It uses vc runtime libraries found in vc toolchain installations.
* Bootstrapping state is separated because when statically linking orc runtime it needs microsoft stl functions to initialize the orc runtime, but static initializers need to be ran in order to fully initialize stl libraries.
* Process symbols can't be used blidnly on msvc platform; otherwise duplicate definition error gets generated. If process symbols are used, it's destined to get out-of-reach error at some point.
* Atexit currently not handled -- will be handled in the follow-up patches.
Reviewed By: lhames
Differential Revision: https://reviews.llvm.org/D130479
