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c3d1f0d661
Start out with pointer spare bits, heap object alignment, null page size, and ObjC reserved bits, and provide static values for X86-64 and for a worst-case generic platform. Swift SVN r7833
65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
//===--- SwiftTargetInfo.h --------------------------------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the SwiftTargetInfo abstract base class. This class
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// provides an interface to target-dependent attributes of interest to Swift.
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//
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//===----------------------------------------------------------------------===//
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#ifndef __SWIFT_IRGEN_TARGET_INFO_H__
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#define __SWIFT_IRGEN_TARGET_INFO_H__
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#include "llvm/ADT/BitVector.h"
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#include "IRGen.h"
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namespace swift {
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namespace irgen {
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class IRGenModule;
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class SwiftTargetInfo {
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public:
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SwiftTargetInfo(llvm::BitVector &&pointerSpareBits,
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llvm::BitVector &&objcPointerReservedBits,
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Alignment heapObjectAlignment,
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uint64_t leastValidPointerValue)
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: PointerSpareBits(std::move(pointerSpareBits)),
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ObjCPointerReservedBits(std::move(objcPointerReservedBits)),
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HeapObjectAlignment(heapObjectAlignment),
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LeastValidPointerValue(leastValidPointerValue)
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{}
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/// Produces a SwiftTargetInfo object appropriate to the target.
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static SwiftTargetInfo get(IRGenModule &IGM);
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/// The spare bit mask for pointers. Bits set in this mask are unused by
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/// pointers of any alignment.
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const llvm::BitVector PointerSpareBits;
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/// The reserved bit mask for Objective-C pointers. Pointer values with
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/// bits from this mask set are reserved by the ObjC runtime and cannot be
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/// used for Swift value layout when a reference type may reference ObjC
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/// objects.
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const llvm::BitVector ObjCPointerReservedBits;
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/// The alignment of heap objects.
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const Alignment HeapObjectAlignment;
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/// The least integer value that can theoretically form a valid pointer.
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/// This excludes addresses in the null page(s) guaranteed to be unmapped by
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/// the platform.
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const uint64_t LeastValidPointerValue;
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};
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}
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}
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#endif |