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48 lines
1.6 KiB
48 lines
1.6 KiB
=============================================
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Building a JIT: Per-function Lazy Compilation
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=============================================
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.. contents::
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:local:
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**This tutorial is under active development. It is incomplete and details may
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change frequently.** Nonetheless we invite you to try it out as it stands, and
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we welcome any feedback.
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Chapter 3 Introduction
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======================
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Welcome to Chapter 3 of the "Building an ORC-based JIT in LLVM" tutorial. This
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chapter discusses lazy JITing and shows you how to enable it by adding an ORC
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CompileOnDemand layer the JIT from `Chapter 2 <BuildingAJIT2.html>`_.
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**To be done:**
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**(1) Describe lazy function-at-a-time JITing and how it differs from the kind
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of eager module-at-a-time JITing that we've been doing so far.**
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**(2) Discuss CompileCallbackManagers and IndirectStubManagers.**
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**(3) Describe CompileOnDemandLayer (automates these components and builds stubs
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and lazy compilation callbacks for IR) and how to add it to the JIT.**
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Full Code Listing
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=================
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Here is the complete code listing for our running example with a CompileOnDemand
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layer added to enable lazy function-at-a-time compilation. To build this example, use:
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.. code-block:: bash
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# Compile
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clang++ -g toy.cpp `llvm-config --cxxflags --ldflags --system-libs --libs core orc native` -O3 -o toy
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# Run
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./toy
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Here is the code:
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.. literalinclude:: ../../examples/Kaleidoscope/BuildingAJIT/Chapter3/KaleidoscopeJIT.h
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:language: c++
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`Next: Extreme Laziness -- Using Compile Callbacks to JIT directly from ASTs <BuildingAJIT4.html>`_
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