libobjc2

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History

theraven 15ddbdfd71 Added meta-pass that runs all of the LLVM optimisations.		15 years ago
..
COPYING	Added LLVM optimisation passes for libobjc2.	16 years ago
ClassIMPCache.cpp	Fixed LLVM passes to compile with recent LLVM.	15 years ago
ClassLookupCache.cpp	Added meta-pass that runs all of the LLVM optimisations.	15 years ago
ClassMethodInliner.cpp	Fixed LLVM passes to compile with recent LLVM.	15 years ago
IMPCacher.cpp	Fixed LLVM passes to compile with recent LLVM.	15 years ago
IMPCacher.h	Added unfinished inliner that uses type feedback info to inline instance methods.	16 years ago
IvarPass.cpp	Fixed LLVM passes to compile with recent LLVM.	15 years ago
LoopIMPCachePass.cpp	Fixed LLVM passes to compile with recent LLVM.	15 years ago
Makefile	Rename the library with the lib prefix so it can actually be linked sensibly.	16 years ago
ObjectiveCOpts.cpp	Added meta-pass that runs all of the LLVM optimisations.	15 years ago
ObjectiveCOpts.h	Added meta-pass that runs all of the LLVM optimisations.	15 years ago
README	Added LLVM optimisation passes for libobjc2.	16 years ago
TypeFeedback.cpp	Fixed LLVM passes to compile with recent LLVM.	15 years ago
TypeFeedbackDrivenInliner.cpp	Fixed LLVM passes to compile with recent LLVM.	15 years ago
TypeInfoProvider.h	Added missing files.	16 years ago

README

GNUstep Runtime Optimisations
=============================

This directory contains LLVM optimisations specific to libobjc2.  To build
them, you must copy this directory to llvm/lib/Transforms/GNURuntime (where
llvm is the root of your llvm checkout).

Running GNU make will then create GNUObjCRuntime.so.  This library can be
passed to opt to run optimisations on bitcode generated with clang or
LanguageKit.

Non-Fragile Ivar Pass
---------------------

Running `opt -gnu-nonfragile-ivar` will invoke the non-fragile instance
variable lowering pass.  This will turn non-fragile instance variable accesses,
which go via one or two indirection layers, into more fragile ones.  If a class
and all of its superclasses are present in the module then this pass will turn
indirect instance variable accesses into hard-coded ones.

For this pass to be most useful, it should be run as a link-time optimisation.

Type Feedback
-------------

Running `opt -gnu-objc-type-feedback` enables type feedback.  Objective-C
message lookups will be replaced by calls to the profiling version in the
runtime library.  The generated data can then be used for future optimisations
(speculative inlining, polymorphic inline caching, and so on), which have not
yet been written.