builtin.go raw

   1  // Copyright 2019 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 goobj
   6  
   7  // Builtin (compiler-generated) function references appear
   8  // frequently. We assign special indices for them, so they
   9  // don't need to be referenced by name.
  10  
  11  // NBuiltin returns the number of listed builtin
  12  // symbols.
  13  func NBuiltin() int {
  14  	return len(builtins)
  15  }
  16  
  17  // BuiltinName returns the name and ABI of the i-th
  18  // builtin symbol.
  19  func BuiltinName(i int) (string, int) {
  20  	return builtins[i].name, builtins[i].abi
  21  }
  22  
  23  // BuiltinIdx returns the index of the builtin with the
  24  // given name and abi, or -1 if it is not a builtin.
  25  func BuiltinIdx(name string, abi int) int {
  26  	i, ok := builtinMap[name]
  27  	if !ok {
  28  		return -1
  29  	}
  30  	if builtins[i].abi != abi {
  31  		return -1
  32  	}
  33  	return i
  34  }
  35  
  36  //go:generate go run mkbuiltin.go
  37  
  38  var builtinMap map[string]int
  39  
  40  func init() {
  41  	builtinMap = make(map[string]int, len(builtins))
  42  	for i, b := range builtins {
  43  		builtinMap[b.name] = i
  44  	}
  45  }
  46