From: Michael Pratt <mpratt@google.com>
Date: Wed, 24 Apr 2024 15:31:19 +0000 (-0400)
Subject: cmd/compile: add debug log prior to export data lookup
X-Git-Tag: go1.23rc1~535
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=d037bba19b26064dcbd19be2c17e042c8d421f2c;p=gostls13.git

cmd/compile: add debug log prior to export data lookup

If there is a crash in LookupFunc (which has occurred a few times now),
this ensures that we log the offending symbol before crashing.

For #67016.

Change-Id: I0119597de2be3d1b97c41a9361273d1feb90ec11
Reviewed-on: https://go-review.googlesource.com/c/go/+/581437
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
---

diff --git a/src/cmd/compile/internal/pgoir/irgraph.go b/src/cmd/compile/internal/pgoir/irgraph.go
index cb4333e6d7..f1c8d13dec 100644
--- a/src/cmd/compile/internal/pgoir/irgraph.go
+++ b/src/cmd/compile/internal/pgoir/irgraph.go
@@ -333,6 +333,9 @@ func addIndirectEdges(g *IRGraph, namedEdgeMap pgo.NamedEdgeMap) {
 			// devirtualization. Instantiation of generic functions
 			// will likely need to be done at the devirtualization
 			// site, if at all.
+			if base.Debug.PGODebug >= 3 {
+				fmt.Printf("addIndirectEdges: %s attempting export data lookup\n", key.CalleeName)
+			}
 			fn, err := LookupFunc(key.CalleeName)
 			if err == nil {
 				if base.Debug.PGODebug >= 3 {