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//===- ARCRuntimeEntryPoints.h - ObjC ARC Optimization --*- C++ -*---------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/// \file
/// This file contains a class ARCRuntimeEntryPoints for use in
/// creating/managing references to entry points to the arc objective c runtime.
///
/// WARNING: This file knows about certain library functions. It recognizes them
/// by name, and hardwires knowledge of their semantics.
///
/// WARNING: This file knows about how certain Objective-C library functions are
/// used. Naive LLVM IR transformations which would otherwise be
/// behavior-preserving may break these assumptions.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TRANSFORMS_OBJCARC_ARCRUNTIMEENTRYPOINTS_H
#define LLVM_LIB_TRANSFORMS_OBJCARC_ARCRUNTIMEENTRYPOINTS_H
#include "ObjCARC.h"
namespace llvm {
namespace objcarc {
/// Declarations for ObjC runtime functions and constants. These are initialized
/// lazily to avoid cluttering up the Module with unused declarations.
class ARCRuntimeEntryPoints {
public:
enum EntryPointType {
EPT_AutoreleaseRV,
EPT_Release,
EPT_Retain,
EPT_RetainBlock,
EPT_Autorelease,
EPT_StoreStrong,
EPT_RetainRV,
EPT_RetainAutorelease,
EPT_RetainAutoreleaseRV
};
ARCRuntimeEntryPoints() : TheModule(nullptr),
AutoreleaseRV(nullptr),
Release(nullptr),
Retain(nullptr),
RetainBlock(nullptr),
Autorelease(nullptr),
StoreStrong(nullptr),
RetainRV(nullptr),
RetainAutorelease(nullptr),
RetainAutoreleaseRV(nullptr) { }
~ARCRuntimeEntryPoints() { }
void Initialize(Module *M) {
TheModule = M;
AutoreleaseRV = nullptr;
Release = nullptr;
Retain = nullptr;
RetainBlock = nullptr;
Autorelease = nullptr;
StoreStrong = nullptr;
RetainRV = nullptr;
RetainAutorelease = nullptr;
RetainAutoreleaseRV = nullptr;
}
Constant *get(const EntryPointType entry) {
assert(TheModule != nullptr && "Not initialized.");
switch (entry) {
case EPT_AutoreleaseRV:
return getI8XRetI8XEntryPoint(AutoreleaseRV,
"objc_autoreleaseReturnValue", true);
case EPT_Release:
return getVoidRetI8XEntryPoint(Release, "objc_release");
case EPT_Retain:
return getI8XRetI8XEntryPoint(Retain, "objc_retain", true);
case EPT_RetainBlock:
return getI8XRetI8XEntryPoint(RetainBlock, "objc_retainBlock", false);
case EPT_Autorelease:
return getI8XRetI8XEntryPoint(Autorelease, "objc_autorelease", true);
case EPT_StoreStrong:
return getI8XRetI8XXI8XEntryPoint(StoreStrong, "objc_storeStrong");
case EPT_RetainRV:
return getI8XRetI8XEntryPoint(RetainRV,
"objc_retainAutoreleasedReturnValue", true);
case EPT_RetainAutorelease:
return getI8XRetI8XEntryPoint(RetainAutorelease, "objc_retainAutorelease",
true);
case EPT_RetainAutoreleaseRV:
return getI8XRetI8XEntryPoint(RetainAutoreleaseRV,
"objc_retainAutoreleaseReturnValue", true);
}
llvm_unreachable("Switch should be a covered switch.");
}
private:
/// Cached reference to the module which we will insert declarations into.
Module *TheModule;
/// Declaration for ObjC runtime function objc_autoreleaseReturnValue.
Constant *AutoreleaseRV;
/// Declaration for ObjC runtime function objc_release.
Constant *Release;
/// Declaration for ObjC runtime function objc_retain.
Constant *Retain;
/// Declaration for ObjC runtime function objc_retainBlock.
Constant *RetainBlock;
/// Declaration for ObjC runtime function objc_autorelease.
Constant *Autorelease;
/// Declaration for objc_storeStrong().
Constant *StoreStrong;
/// Declaration for objc_retainAutoreleasedReturnValue().
Constant *RetainRV;
/// Declaration for objc_retainAutorelease().
Constant *RetainAutorelease;
/// Declaration for objc_retainAutoreleaseReturnValue().
Constant *RetainAutoreleaseRV;
Constant *getVoidRetI8XEntryPoint(Constant *&Decl,
const char *Name) {
if (Decl)
return Decl;
LLVMContext &C = TheModule->getContext();
Type *Params[] = { PointerType::getUnqual(Type::getInt8Ty(C)) };
AttributeSet Attr =
AttributeSet().addAttribute(C, AttributeSet::FunctionIndex,
Attribute::NoUnwind);
FunctionType *Fty = FunctionType::get(Type::getVoidTy(C), Params,
/*isVarArg=*/false);
return Decl = TheModule->getOrInsertFunction(Name, Fty, Attr);
}
Constant *getI8XRetI8XEntryPoint(Constant *& Decl,
const char *Name,
bool NoUnwind = false) {
if (Decl)
return Decl;
LLVMContext &C = TheModule->getContext();
Type *I8X = PointerType::getUnqual(Type::getInt8Ty(C));
Type *Params[] = { I8X };
FunctionType *Fty = FunctionType::get(I8X, Params, /*isVarArg=*/false);
AttributeSet Attr = AttributeSet();
if (NoUnwind)
Attr = Attr.addAttribute(C, AttributeSet::FunctionIndex,
Attribute::NoUnwind);
return Decl = TheModule->getOrInsertFunction(Name, Fty, Attr);
}
Constant *getI8XRetI8XXI8XEntryPoint(Constant *&Decl,
const char *Name) {
if (Decl)
return Decl;
LLVMContext &C = TheModule->getContext();
Type *I8X = PointerType::getUnqual(Type::getInt8Ty(C));
Type *I8XX = PointerType::getUnqual(I8X);
Type *Params[] = { I8XX, I8X };
AttributeSet Attr =
AttributeSet().addAttribute(C, AttributeSet::FunctionIndex,
Attribute::NoUnwind);
Attr = Attr.addAttribute(C, 1, Attribute::NoCapture);
FunctionType *Fty = FunctionType::get(Type::getVoidTy(C), Params,
/*isVarArg=*/false);
return Decl = TheModule->getOrInsertFunction(Name, Fty, Attr);
}
}; // class ARCRuntimeEntryPoints
} // namespace objcarc
} // namespace llvm
#endif
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