From 43dabd566d38e3ea47d093fa92e2fb44452b8d1c Mon Sep 17 00:00:00 2001
From: Yabin Cui <yabinc@google.com>
Date: Mon, 22 Jan 2018 15:11:07 -0800
Subject: simpleperf: fix test record_cmd.post_unwind_option.

Sometimes a sample hits a pc location with no map, and results in
empty ips vector. This makes test record_cmd.post_unwind_option fail.

Bug: none
Test: run CtsSimpleperfTestCases.
Change-Id: If9ced5ee36fc6967afd2e82a11440d7410a74ea7
---
 simpleperf/OfflineUnwinder.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/simpleperf/OfflineUnwinder.cpp b/simpleperf/OfflineUnwinder.cpp
index f06103b6..53cf4512 100644
--- a/simpleperf/OfflineUnwinder.cpp
+++ b/simpleperf/OfflineUnwinder.cpp
@@ -165,7 +165,13 @@ bool OfflineUnwinder::UnwindCallChain(int abi, const ThreadEntry& thread, const
     }
   }
   if (ips->empty()) {
-    return false;
+    uint64_t ip_reg_value;
+    if (!GetIpRegValue(regs, arch, &ip_reg_value)) {
+      LOG(ERROR) << "can't get ip reg value";
+      return false;
+    }
+    ips->push_back(ip_reg_value);
+    sps->push_back(sp_reg_value);
   }
   if (collect_stat_) {
     unwinding_result_.used_time = GetSystemClock() - start_time;
-- 
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