40 lines
1.6 KiB
Go
40 lines
1.6 KiB
Go
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// package goarch contains GOARCH-specific constants.
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package goarch
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type ArchFamilyType int
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// PtrSize is the size of a pointer in bytes - unsafe.Sizeof(uintptr(0)) but as an ideal constant.
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// It is also the size of the machine's native word size (that is, 4 on 32-bit systems, 8 on 64-bit).
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const PtrSize = 4 << (^uintptr(0) >> 63)
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// ArchFamily is the architecture family (AMD64, ARM, ...)
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const ArchFamily ArchFamilyType = _ArchFamily
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// BigEndian reports whether the architecture is big-endian.
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const BigEndian = _BigEndian
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// DefaultPhysPageSize is the default physical page size.
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const DefaultPhysPageSize = _DefaultPhysPageSize
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// PCQuantum is the minimal unit for a program counter (1 on x86, 4 on most other systems).
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// The various PC tables record PC deltas pre-divided by PCQuantum.
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const PCQuantum = _PCQuantum
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// Int64Align is the required alignment for a 64-bit integer (4 on 32-bit systems, 8 on 64-bit).
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const Int64Align = _Int64Align
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// MinFrameSize is the size of the system-reserved words at the bottom
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// of a frame (just above the architectural stack pointer).
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// It is zero on x86 and PtrSize on most non-x86 (LR-based) systems.
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// On PowerPC it is larger, to cover three more reserved words:
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// the compiler word, the link editor word, and the TOC save word.
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const MinFrameSize = _MinFrameSize
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// StackAlign is the required alignment of the SP register.
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// The stack must be at least word aligned, but some architectures require more.
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const StackAlign = _StackAlign
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