Imported Upstream version 1.3upstream/1.3

1 files changed, 69 insertions, 0 deletions

diff --git a/src/cmd/nm/macho.go b/src/cmd/nm/macho.go
new file mode 100644
index 000000000..c60bde55b
--- /dev/null
+++ b/src/cmd/nm/macho.go
@@ -0,0 +1,69 @@
+// Copyright 2013 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.
+
+// Parsing of Mach-O executables (OS X).
+
+package main
+
+import (
+	"debug/macho"
+	"os"
+	"sort"
+)
+
+func machoSymbols(f *os.File) []Sym {
+	p, err := macho.NewFile(f)
+	if err != nil {
+		errorf("parsing %s: %v", f.Name(), err)
+		return nil
+	}
+
+	if p.Symtab == nil {
+		errorf("%s: no symbol table", f.Name())
+		return nil
+	}
+
+	// Build sorted list of addresses of all symbols.
+	// We infer the size of a symbol by looking at where the next symbol begins.
+	var addrs []uint64
+	for _, s := range p.Symtab.Syms {
+		addrs = append(addrs, s.Value)
+	}
+	sort.Sort(uint64s(addrs))
+
+	var syms []Sym
+	for _, s := range p.Symtab.Syms {
+		sym := Sym{Name: s.Name, Addr: s.Value, Code: '?'}
+		i := sort.Search(len(addrs), func(x int) bool { return addrs[x] > s.Value })
+		if i < len(addrs) {
+			sym.Size = int64(addrs[i] - s.Value)
+		}
+		if s.Sect == 0 {
+			sym.Code = 'U'
+		} else if int(s.Sect) <= len(p.Sections) {
+			sect := p.Sections[s.Sect-1]
+			switch sect.Seg {
+			case "__TEXT":
+				sym.Code = 'R'
+			case "__DATA":
+				sym.Code = 'D'
+			}
+			switch sect.Seg + " " + sect.Name {
+			case "__TEXT __text":
+				sym.Code = 'T'
+			case "__DATA __bss", "__DATA __noptrbss":
+				sym.Code = 'B'
+			}
+		}
+		syms = append(syms, sym)
+	}
+
+	return syms
+}
+
+type uint64s []uint64
+
+func (x uint64s) Len() int           { return len(x) }
+func (x uint64s) Swap(i, j int)      { x[i], x[j] = x[j], x[i] }
+func (x uint64s) Less(i, j int) bool { return x[i] < x[j] }