compiletype.go

     1  // Copyright 2023 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package abi
     6  
     7  // These functions are the build-time version of the Go type data structures.
     8  
     9  // Their contents must be kept in sync with their definitions.
    10  // Because the host and target type sizes can differ, the compiler and
    11  // linker cannot use the host information that they might get from
    12  // either unsafe.Sizeof and Alignof, nor runtime, reflect, or reflectlite.
    13  
    14  // CommonSize returns sizeof(Type) for a compilation target with a given ptrSize
    15  func CommonSize(ptrSize int) int { return 4*ptrSize + 8 + 8 }
    16  
    17  // StructFieldSize returns sizeof(StructField) for a compilation target with a given ptrSize
    18  func StructFieldSize(ptrSize int) int { return 3 * ptrSize }
    19  
    20  // UncommonSize returns sizeof(UncommonType).  This currently does not depend on ptrSize.
    21  // This exported function is in an internal package, so it may change to depend on ptrSize in the future.
    22  func UncommonSize() uint64 { return 4 + 2 + 2 + 4 + 4 }
    23  
    24  // TFlagOff returns the offset of Type.TFlag for a compilation target with a given ptrSize
    25  func TFlagOff(ptrSize int) int { return 2*ptrSize + 4 }
    26  
    27  // ITabTypeOff returns the offset of ITab.Type for a compilation target with a given ptrSize
    28  func ITabTypeOff(ptrSize int) int { return ptrSize }
    29
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