From f75af8c1464e948b5e166cf5ab09ebf0d82fc253 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@golang.org>
Date: Mon, 27 Jul 2020 22:27:54 -0700
Subject: libgo: update to go1.15rc1

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/245157
---
 libgo/go/runtime/debuglog.go | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

(limited to 'libgo/go/runtime/debuglog.go')

diff --git a/libgo/go/runtime/debuglog.go b/libgo/go/runtime/debuglog.go
index 404d057..d8c87c7 100644
--- a/libgo/go/runtime/debuglog.go
+++ b/libgo/go/runtime/debuglog.go
@@ -672,13 +672,17 @@ func (r *debugLogReader) printVal() bool {
 		print("..(", r.uvarint(), " more bytes)..")
 
 	case debugLogPC:
-		printDebugLogPC(uintptr(r.uvarint()))
+		printDebugLogPC(uintptr(r.uvarint()), false)
 
 	case debugLogTraceback:
 		n := int(r.uvarint())
 		for i := 0; i < n; i++ {
 			print("\n\t")
-			printDebugLogPC(uintptr(r.uvarint()))
+			// gentraceback PCs are always return PCs.
+			// Convert them to call PCs.
+			//
+			// TODO(austin): Expand inlined frames.
+			printDebugLogPC(uintptr(r.uvarint()), true)
 		}
 	}
 
@@ -801,9 +805,18 @@ func printDebugLog() {
 	printunlock()
 }
 
-func printDebugLogPC(pc uintptr) {
-	print(hex(pc))
+// printDebugLogPC prints a single symbolized PC. If returnPC is true,
+// pc is a return PC that must first be converted to a call PC.
+func printDebugLogPC(pc uintptr, returnPC bool) {
 	name, file, line, _ := funcfileline(pc, -1, false)
+	entry := funcentry(pc)
+	if returnPC && (name == "" || (entry != 0 && pc > funcentry(pc))) {
+		// TODO(austin): Don't back up if the previous frame
+		// was a sigpanic.
+		pc--
+	}
+
+	print(hex(pc))
 	if name == "" {
 		print(" [unknown PC]")
 	} else {
-- 
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