From: Dan Kortschak <dan@kortschak.io>
Date: Sun, 29 Aug 2021 04:31:03 +0000 (+0930)
Subject: debug/plan9obj: export ErrNoSymbols
X-Git-Tag: go1.18beta1~492
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=58ec92527041f88d427390a92619cd9a927b6aba;p=gostls13.git

debug/plan9obj: export ErrNoSymbols

This allows callers of *File.Symbols to distinguish absence of symbols
from other errors as can already by done in debug/elf.

Fixes #48052

Change-Id: I5ba15d8473911e516c016a69c1f1c710f7fc4cd5
Reviewed-on: https://go-review.googlesource.com/c/go/+/350229
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
---

diff --git a/src/debug/plan9obj/file.go b/src/debug/plan9obj/file.go
index 314608da61..c054635148 100644
--- a/src/debug/plan9obj/file.go
+++ b/src/debug/plan9obj/file.go
@@ -301,11 +301,15 @@ func newTable(symtab []byte, ptrsz int) ([]Sym, error) {
 	return syms, nil
 }
 
+// ErrNoSymbols is returned by File.Symbols if there is no such section
+// in the File.
+var ErrNoSymbols = errors.New("no symbol section")
+
 // Symbols returns the symbol table for f.
 func (f *File) Symbols() ([]Sym, error) {
 	symtabSection := f.Section("syms")
 	if symtabSection == nil {
-		return nil, errors.New("no symbol section")
+		return nil, ErrNoSymbols
 	}
 
 	symtab, err := symtabSection.Data()