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b1827d8a8f
This patch adds powerpc64le Linux support. While the patch also adds the matching powerpc64 bits, there are endian issues that need to be sorted out. The PowerPC LLVM changes for the swift ABI (eg returning three element non-homogeneous aggregates) are still in the works, but a simple LLVM fix to allow those aggregates results in swift passing all but 8 test cases.
102 lines
4.2 KiB
C++
102 lines
4.2 KiB
C++
//===--- System.h - Swift ABI system-specific constants ---------*- 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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// Here's some fun facts about the target platforms we support!
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_ABI_SYSTEM_H
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#define SWIFT_ABI_SYSTEM_H
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// In general, these macros are expected to expand to host-independent
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// integer constant expressions. This allows the same data to feed
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// both the compiler and runtime implementation.
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/******************************* Default Rules ********************************/
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/// The least valid pointer value for an actual pointer (as opposed to
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/// Objective-C pointers, which may be tagged pointers and are covered
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/// separately). Values up to this are "extra inhabitants" of the
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/// pointer representation, and payloaded enum types can take
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/// advantage of that as they see fit.
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///
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/// By default, we assume that there's at least an unmapped page at
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/// the bottom of the address space. 4K is a reasonably likely page
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/// size.
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///
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/// The minimum possible value for this macro is 1; we always assume
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/// that the null representation is available.
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#define SWIFT_ABI_DEFAULT_LEAST_VALID_POINTER 4096
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/// The bitmask of spare bits in a function pointer.
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#define SWIFT_ABI_DEFAULT_FUNCTION_SPARE_BITS_MASK 0
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/// The bitmask of spare bits in a Swift heap object pointer. A Swift
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/// heap object allocation will never set any of these bits.
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#define SWIFT_ABI_DEFAULT_SWIFT_SPARE_BITS_MASK 0
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/// The bitmask of reserved bits in an Objective-C object pointer.
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/// By default we assume the ObjC runtime doesn't use tagged pointers.
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#define SWIFT_ABI_DEFAULT_OBJC_RESERVED_BITS_MASK 0
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/// The number of low bits in an Objective-C object pointer that
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/// are reserved by the Objective-C runtime.
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#define SWIFT_ABI_DEFAULT_OBJC_NUM_RESERVED_LOW_BITS 0
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/// The ObjC runtime will not use pointer values for which
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/// ``pointer & SWIFT_ABI_XXX_OBJC_RESERVED_BITS_MASK == 0 &&
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/// pointer & SWIFT_ABI_XXX_SWIFT_SPARE_BITS_MASK != 0``.
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/*********************************** i386 *************************************/
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// Heap objects are pointer-aligned, so the low two bits are unused.
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#define SWIFT_ABI_I386_SWIFT_SPARE_BITS_MASK 0x00000003U
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/*********************************** arm **************************************/
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// Heap objects are pointer-aligned, so the low two bits are unused.
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#define SWIFT_ABI_ARM_SWIFT_SPARE_BITS_MASK 0x00000003U
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/*********************************** x86-64 ***********************************/
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/// Darwin reserves the low 4GB of address space.
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#define SWIFT_ABI_DARWIN_X86_64_LEAST_VALID_POINTER (4ULL*1024*1024*1024)
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// Only the bottom 56 bits are used, and heap objects are eight-byte-aligned.
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//
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#define SWIFT_ABI_X86_64_SWIFT_SPARE_BITS_MASK 0xFF00000000000007ULL
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// Objective-C reserves the high and low bits for tagged pointers.
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// Systems exist which use either bit.
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#define SWIFT_ABI_X86_64_OBJC_RESERVED_BITS_MASK 0x8000000000000001ULL
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#define SWIFT_ABI_X86_64_OBJC_NUM_RESERVED_LOW_BITS 1
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/*********************************** arm64 ************************************/
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/// Darwin reserves the low 4GB of address space.
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#define SWIFT_ABI_DARWIN_ARM64_LEAST_VALID_POINTER (4ULL*1024*1024*1024)
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// TBI guarantees the top byte of pointers is unused.
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// Heap objects are eight-byte aligned.
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#define SWIFT_ABI_ARM64_SWIFT_SPARE_BITS_MASK 0xFF00000000000007ULL
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// Objective-C reserves just the high bit for tagged pointers.
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#define SWIFT_ABI_ARM64_OBJC_RESERVED_BITS_MASK 0x8000000000000000ULL
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#define SWIFT_ABI_ARM64_OBJC_NUM_RESERVED_LOW_BITS 0
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/*********************************** powerpc64 ************************************/
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// Heap objects are pointer-aligned, so the low three bits are unused.
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#define SWIFT_ABI_POWERPC64_SWIFT_SPARE_BITS_MASK 0x0000000000000007ULL
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#endif /* SWIFT_ABI_SYSTEM_H */
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