be4f571107
We're moving ARC optimisation and ARC emission in clang away from runtime methods and towards intrinsics. This is the part which actually uses the intrinsics in the ARC optimizer when both analyzing the existing calls and emitting new ones. Differential Revision: https://reviews.llvm.org/D55348 Reviewers: ahatanak llvm-svn: 349534
148 lines
4.8 KiB
C++
148 lines
4.8 KiB
C++
//===- ARCRuntimeEntryPoints.h - ObjC ARC Optimization ----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file
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/// This file contains a class ARCRuntimeEntryPoints for use in
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/// creating/managing references to entry points to the arc objective c runtime.
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///
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/// WARNING: This file knows about certain library functions. It recognizes them
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/// by name, and hardwires knowledge of their semantics.
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///
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/// WARNING: This file knows about how certain Objective-C library functions are
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/// used. Naive LLVM IR transformations which would otherwise be
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/// behavior-preserving may break these assumptions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TRANSFORMS_OBJCARC_ARCRUNTIMEENTRYPOINTS_H
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#define LLVM_LIB_TRANSFORMS_OBJCARC_ARCRUNTIMEENTRYPOINTS_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/IR/Attributes.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Type.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cassert>
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namespace llvm {
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class Constant;
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class LLVMContext;
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namespace objcarc {
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enum class ARCRuntimeEntryPointKind {
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AutoreleaseRV,
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Release,
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Retain,
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RetainBlock,
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Autorelease,
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StoreStrong,
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RetainRV,
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RetainAutorelease,
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RetainAutoreleaseRV,
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};
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/// Declarations for ObjC runtime functions and constants. These are initialized
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/// lazily to avoid cluttering up the Module with unused declarations.
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class ARCRuntimeEntryPoints {
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public:
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ARCRuntimeEntryPoints() = default;
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void init(Module *M) {
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TheModule = M;
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AutoreleaseRV = nullptr;
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Release = nullptr;
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Retain = nullptr;
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RetainBlock = nullptr;
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Autorelease = nullptr;
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StoreStrong = nullptr;
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RetainRV = nullptr;
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RetainAutorelease = nullptr;
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RetainAutoreleaseRV = nullptr;
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}
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Constant *get(ARCRuntimeEntryPointKind kind) {
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assert(TheModule != nullptr && "Not initialized.");
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switch (kind) {
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case ARCRuntimeEntryPointKind::AutoreleaseRV:
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return getIntrinsicEntryPoint(AutoreleaseRV,
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Intrinsic::objc_autoreleaseReturnValue);
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case ARCRuntimeEntryPointKind::Release:
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return getIntrinsicEntryPoint(Release, Intrinsic::objc_release);
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case ARCRuntimeEntryPointKind::Retain:
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return getIntrinsicEntryPoint(Retain, Intrinsic::objc_retain);
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case ARCRuntimeEntryPointKind::RetainBlock:
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return getIntrinsicEntryPoint(RetainBlock, Intrinsic::objc_retainBlock);
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case ARCRuntimeEntryPointKind::Autorelease:
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return getIntrinsicEntryPoint(Autorelease, Intrinsic::objc_autorelease);
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case ARCRuntimeEntryPointKind::StoreStrong:
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return getIntrinsicEntryPoint(StoreStrong, Intrinsic::objc_storeStrong);
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case ARCRuntimeEntryPointKind::RetainRV:
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return getIntrinsicEntryPoint(RetainRV,
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Intrinsic::objc_retainAutoreleasedReturnValue);
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case ARCRuntimeEntryPointKind::RetainAutorelease:
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return getIntrinsicEntryPoint(RetainAutorelease,
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Intrinsic::objc_retainAutorelease);
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case ARCRuntimeEntryPointKind::RetainAutoreleaseRV:
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return getIntrinsicEntryPoint(RetainAutoreleaseRV,
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Intrinsic::objc_retainAutoreleaseReturnValue);
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}
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llvm_unreachable("Switch should be a covered switch.");
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}
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private:
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/// Cached reference to the module which we will insert declarations into.
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Module *TheModule = nullptr;
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/// Declaration for ObjC runtime function objc_autoreleaseReturnValue.
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Constant *AutoreleaseRV = nullptr;
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/// Declaration for ObjC runtime function objc_release.
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Constant *Release = nullptr;
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/// Declaration for ObjC runtime function objc_retain.
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Constant *Retain = nullptr;
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/// Declaration for ObjC runtime function objc_retainBlock.
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Constant *RetainBlock = nullptr;
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/// Declaration for ObjC runtime function objc_autorelease.
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Constant *Autorelease = nullptr;
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/// Declaration for objc_storeStrong().
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Constant *StoreStrong = nullptr;
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/// Declaration for objc_retainAutoreleasedReturnValue().
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Constant *RetainRV = nullptr;
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/// Declaration for objc_retainAutorelease().
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Constant *RetainAutorelease = nullptr;
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/// Declaration for objc_retainAutoreleaseReturnValue().
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Constant *RetainAutoreleaseRV = nullptr;
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Constant *getIntrinsicEntryPoint(Constant *&Decl, Intrinsic::ID IntID) {
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if (Decl)
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return Decl;
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return Decl = Intrinsic::getDeclaration(TheModule, IntID);
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}
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};
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} // end namespace objcarc
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} // end namespace llvm
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#endif // LLVM_LIB_TRANSFORMS_OBJCARC_ARCRUNTIMEENTRYPOINTS_H
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