github.com/ader1990/go@v0.0.0-20140630135419-8c24447fa791/src/cmd/nm/plan9obj.go (about)

     1  // Copyright 2014 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  // Parsing of Plan 9 a.out executables.
     6  
     7  package main
     8  
     9  import (
    10  	"debug/plan9obj"
    11  	"os"
    12  	"sort"
    13  )
    14  
    15  func plan9Symbols(f *os.File) []Sym {
    16  	p, err := plan9obj.NewFile(f)
    17  	if err != nil {
    18  		errorf("parsing %s: %v", f.Name(), err)
    19  		return nil
    20  	}
    21  
    22  	plan9Syms, err := p.Symbols()
    23  	if err != nil {
    24  		errorf("parsing %s: %v", f.Name(), err)
    25  		return nil
    26  	}
    27  
    28  	// Build sorted list of addresses of all symbols.
    29  	// We infer the size of a symbol by looking at where the next symbol begins.
    30  	var addrs []uint64
    31  	for _, s := range plan9Syms {
    32  		addrs = append(addrs, s.Value)
    33  	}
    34  	sort.Sort(uint64s(addrs))
    35  
    36  	var syms []Sym
    37  
    38  	for _, s := range plan9Syms {
    39  		sym := Sym{Addr: s.Value, Name: s.Name, Code: rune(s.Type)}
    40  		i := sort.Search(len(addrs), func(x int) bool { return addrs[x] > s.Value })
    41  		if i < len(addrs) {
    42  			sym.Size = int64(addrs[i] - s.Value)
    43  		}
    44  		syms = append(syms, sym)
    45  	}
    46  
    47  	return syms
    48  }