From: Josh Bleecher Snyder <josharian@gmail.com>
Date: Sat, 22 Aug 2015 20:30:45 +0000 (-0700)
Subject: [dev.ssa] cmd/compile: make "*Value".String more robust
X-Git-Tag: go1.7beta1~1623^2^2~254
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=220e70540445c26463238ff094b6254055ac2b31;p=gostls13.git

[dev.ssa] cmd/compile: make "*Value".String more robust

Change-Id: I4ae38440a33574421c9e3e350701e86e8a224b92
Reviewed-on: https://go-review.googlesource.com/13842
Reviewed-by: Todd Neal <todd@tneal.org>
Reviewed-by: Keith Randall <khr@golang.org>
---

diff --git a/src/cmd/compile/internal/ssa/value.go b/src/cmd/compile/internal/ssa/value.go
index 286edc0cda..04ea17cce9 100644
--- a/src/cmd/compile/internal/ssa/value.go
+++ b/src/cmd/compile/internal/ssa/value.go
@@ -48,6 +48,9 @@ type Value struct {
 
 // short form print.  Just v#.
 func (v *Value) String() string {
+	if v == nil {
+		return "nil" // should never happen, but not panicking helps with debugging
+	}
 	return fmt.Sprintf("v%d", v.ID)
 }