73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
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//===- ObjCARCUtil.h - ObjC ARC Utility Functions ---------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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/// \file
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/// This file defines ARC utility functions which are used by various parts of
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/// the compiler.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_OBJCARCUTIL_H
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#define LLVM_ANALYSIS_OBJCARCUTIL_H
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#include "llvm/Analysis/ObjCARCInstKind.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/InstrTypes.h"
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#include "llvm/IR/LLVMContext.h"
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namespace llvm {
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namespace objcarc {
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inline const char *getRVMarkerModuleFlagStr() {
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return "clang.arc.retainAutoreleasedReturnValueMarker";
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}
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inline bool hasAttachedCallOpBundle(const CallBase *CB) {
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// Ignore the bundle if the return type is void. Global optimization passes
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// can turn the called function's return type to void. That should happen only
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// if the call doesn't return and the call to @llvm.objc.clang.arc.noop.use
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// no longer consumes the function return or is deleted. In that case, it's
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// not necessary to emit the marker instruction or calls to the ARC runtime
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// functions.
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return !CB->getFunctionType()->getReturnType()->isVoidTy() &&
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CB->getOperandBundle(LLVMContext::OB_clang_arc_attachedcall)
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.has_value();
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}
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/// This function returns operand bundle clang_arc_attachedcall's argument,
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/// which is the address of the ARC runtime function.
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inline Optional<Function *> getAttachedARCFunction(const CallBase *CB) {
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auto B = CB->getOperandBundle(LLVMContext::OB_clang_arc_attachedcall);
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if (!B)
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return None;
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return cast<Function>(B->Inputs[0]);
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}
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/// Check whether the function is retainRV/unsafeClaimRV.
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inline bool isRetainOrClaimRV(ARCInstKind Kind) {
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return Kind == ARCInstKind::RetainRV || Kind == ARCInstKind::UnsafeClaimRV;
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}
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/// This function returns the ARCInstKind of the function attached to operand
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/// bundle clang_arc_attachedcall. It returns None if the call doesn't have the
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/// operand bundle or the operand is null. Otherwise it returns either RetainRV
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/// or UnsafeClaimRV.
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inline ARCInstKind getAttachedARCFunctionKind(const CallBase *CB) {
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Optional<Function *> Fn = getAttachedARCFunction(CB);
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if (!Fn)
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return ARCInstKind::None;
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auto FnClass = GetFunctionClass(*Fn);
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assert(isRetainOrClaimRV(FnClass) && "unexpected ARC runtime function");
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return FnClass;
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}
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} // end namespace objcarc
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} // end namespace llvm
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#endif
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