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