symbol.go

     1  // Copyright 2017 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 sym
     6  
     7  import (
     8  	"cmd/internal/obj"
     9  	"internal/buildcfg"
    10  )
    11  
    12  const (
    13  	SymVerABI0        = 0
    14  	SymVerABIInternal = 1
    15  	SymVerABICount    = 2  // Number of internal ABIs
    16  	SymVerStatic      = 10 // Minimum version used by static (file-local) syms
    17  )
    18  
    19  func ABIToVersion(abi obj.ABI) int {
    20  	switch abi {
    21  	case obj.ABI0:
    22  		return SymVerABI0
    23  	case obj.ABIInternal:
    24  		if !buildcfg.Experiment.RegabiWrappers {
    25  			// If wrappers are not enabled, ABI0 and ABIInternal are actually same
    26  			// so we normalize everything to ABI0.
    27  			return SymVerABI0
    28  		}
    29  		return SymVerABIInternal
    30  	}
    31  	return -1
    32  }
    33  
    34  func VersionToABI(v int) (obj.ABI, bool) {
    35  	switch v {
    36  	case SymVerABI0:
    37  		return obj.ABI0, true
    38  	case SymVerABIInternal:
    39  		return obj.ABIInternal, true
    40  	}
    41  	return ^obj.ABI(0), false
    42  }
    43
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