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LLJIT now uses JITLink/ObjectLinkingLayer by default where available, so
these steps aren't required to use it. The tutorial is still useful though:
Clients can use it to test altervative linking layer implementations (e.g.
handing off to the system linker) or to test implementations of JITLink that
are still under development.
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Adds a DumpObjects utility that can be used to dump JIT'd objects to disk.
Instances of DebugObjects may be used by ObjectTransformLayer as no-op
transforms.
This patch also adds an ObjectTransformLayer to LLJIT and an example of how
to use this utility to dump JIT'd objects in LLJIT.
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JITLink is LLVM's newer jit-linker. It is an alternative to (and hopefully
eventually a replacement for) LLVM's older jit-linker, RuntimeDyld. Unlike
RuntimeDyld which requries JIT'd code to be complied with the large code
model, JITlink can link code compiled with the small code model, which is
the native code model for a number of targets (including all supported MachO
targets).
This example shows how to:
-- Create a JITLink InProcessMemoryManager
-- Set the code model to small
-- Use a JITLink backed ObjectLinkingLayer as the linking layer for LLJIT
(rather than the default RTDyldObjectLinkingLayer).
Note: This example will only work on platforms supported by JITLink. As of
this commit that's MachO/x86-64 and MachO/arm64.
llvm-svn: 375266
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LLJITBuilder now has a setCompileFunctionCreator method which can be used to
construct a CompileFunction for the LLJIT instance being created. The motivating
use-case for this is supporting ObjectCaches, which can now be set up at
compile-function construction time. To demonstrate this an example project,
LLJITWithObjectCache, is included.
llvm-svn: 365671
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