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7ec0e7348f
Be more conservative in terms of masking ISAs. This reduces tight coupling with the objc runtime. This commit adds the required calls to IRGen and the runtime, and a test case to make sure IRGen is correct.
105 lines
3.5 KiB
C++
105 lines
3.5 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 - 2016 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 "swift/Basic/LLVM.h"
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#include "swift/Basic/ClusteredBitVector.h"
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#include "llvm/ADT/Triple.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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explicit SwiftTargetInfo(llvm::Triple::ObjectFormatType outputObjectFormat,
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unsigned numPointerBits);
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public:
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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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/// True if the ObjC runtime for the chosen platform supports tagged pointers.
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bool hasObjCTaggedPointers() const;
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/// True if the ObjC runtime for the chosen platform requires ISA masking.
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bool hasISAMasking() const {
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return ObjCUseISAMask;
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}
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/// True if the ObjC runtime for the chosen platform has opaque ISAs. This
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/// means that even masking the ISA may not return a pointer value. The ObjC
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/// runtime should be used for all accesses to get the ISA from a value.
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bool hasOpaqueISAs() const {
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return ObjCHasOpaqueISAs;
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}
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/// The target's object format type.
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llvm::Triple::ObjectFormatType OutputObjectFormat;
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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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SpareBitVector PointerSpareBits;
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/// The spare bit mask for (ordinary C) thin function pointers.
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SpareBitVector FunctionPointerSpareBits;
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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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SpareBitVector ObjCPointerReservedBits;
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/// The alignment of heap objects. By default, assume pointer alignment.
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Alignment HeapObjectAlignment;
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/// The least integer value that can theoretically form a valid pointer.
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/// By default, assume that there's an entire page free.
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///
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/// This excludes addresses in the null page(s) guaranteed to be
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/// unmapped by the platform.
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///
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/// Changes to this must be kept in sync with swift/Runtime/Metadata.h.
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uint64_t LeastValidPointerValue;
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/// The maximum number of scalars that we allow to be returned directly.
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unsigned MaxScalarsForDirectResult = 3;
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/// Inline assembly to mark a call to objc_retainAutoreleasedReturnValue.
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llvm::StringRef ObjCRetainAutoreleasedReturnValueMarker;
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/// Some architectures have specialized objc_msgSend variants.
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bool ObjCUseStret = true;
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bool ObjCUseFPRet = false;
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bool ObjCUseFP2Ret = false;
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bool ObjCUseISAMask = false;
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bool ObjCHasOpaqueISAs = false;
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/// The value stored in a Builtin.once predicate to indicate that an
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/// initialization has already happened, if known.
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Optional<int64_t> OnceDonePredicateValue = None;
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};
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}
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}
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#endif
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