Imported Upstream version 1.3upstream/1.3

1 files changed, 63 insertions, 0 deletions

diff --git a/src/cmd/objdump/plan9obj.go b/src/cmd/objdump/plan9obj.go
new file mode 100644
index 000000000..34462f31c
--- /dev/null
+++ b/src/cmd/objdump/plan9obj.go
@@ -0,0 +1,63 @@
+// Copyright 2014 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 Plan 9 a.out executables.
+
+package main
+
+import (
+	"debug/plan9obj"
+	"os"
+	"sort"
+)
+
+var validSymType = map[rune]bool{
+	'T': true,
+	't': true,
+	'D': true,
+	'd': true,
+	'B': true,
+	'b': true,
+}
+
+func plan9Symbols(f *os.File) (syms []Sym, goarch string) {
+	p, err := plan9obj.NewFile(f)
+	if err != nil {
+		errorf("parsing %s: %v", f.Name(), err)
+		return
+	}
+
+	plan9Syms, err := p.Symbols()
+	if err != nil {
+		errorf("parsing %s: %v", f.Name(), err)
+		return
+	}
+
+	goarch = "386"
+
+	// 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 plan9Syms {
+		if !validSymType[s.Type] {
+			continue
+		}
+		addrs = append(addrs, s.Value)
+	}
+	sort.Sort(uint64s(addrs))
+
+	for _, s := range plan9Syms {
+		if !validSymType[s.Type] {
+			continue
+		}
+		sym := Sym{Addr: s.Value, Name: s.Name, Code: rune(s.Type)}
+		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)
+		}
+		syms = append(syms, sym)
+	}
+
+	return
+}