From ebd75f40489b963aa84fc786cc5913e9c7517d45 Mon Sep 17 00:00:00 2001
From: Christopher Ferris <cferris@google.com>
Date: Thu, 3 Mar 2022 16:43:34 -0800
Subject: Update for removal of LocalUnwinder object.

Bug: 120606663

Test: All unit tests pass.
Change-Id: Idc349df7a2045c824af16878dab16fc1c8275f78
---
 android/test_backtrace.cpp | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/android/test_backtrace.cpp b/android/test_backtrace.cpp
index 4a6d20d..0d397fd 100644
--- a/android/test_backtrace.cpp
+++ b/android/test_backtrace.cpp
@@ -18,7 +18,10 @@
 #include "gwp_asan/optional/backtrace.h"
 #include "gwp_asan/optional/segv_handler.h"
 
-#include <unwindstack/LocalUnwinder.h>
+#include <unwindstack/Maps.h>
+#include <unwindstack/Memory.h>
+#include <unwindstack/Regs.h>
+#include <unwindstack/RegsGetLocal.h>
 #include <unwindstack/Unwinder.h>
 
 namespace {
@@ -32,19 +35,21 @@ namespace {
 // potentially more detailed stack frames in the allocation/deallocation traces
 // (as we don't use the production unwinder), but that's fine for test-only.
 size_t BacktraceUnwindstack(uintptr_t *TraceBuffer, size_t Size) {
-  unwindstack::LocalUnwinder unwinder;
-  if (!unwinder.Init()) {
-    return 0;
-  }
-  std::vector<unwindstack::LocalFrameData> frames;
-  if (!unwinder.Unwind(&frames, Size)) {
+  unwindstack::LocalMaps maps;
+  if (!maps.Parse()) {
     return 0;
   }
-  for (const auto &frame : frames) {
+
+  auto process_memory = unwindstack::Memory::CreateProcessMemoryThreadCached(getpid());
+  std::unique_ptr<unwindstack::Regs> regs(unwindstack::Regs::CreateFromLocal());
+  unwindstack::RegsGetLocal(regs.get());
+  unwindstack::Unwinder unwinder(Size, &maps, regs.get(), process_memory);
+  unwinder.Unwind();
+  for (const auto &frame : unwinder.frames()) {
     *TraceBuffer = frame.pc;
     TraceBuffer++;
   }
-  return frames.size();
+  return unwinder.NumFrames();
 }
 
 // We don't need any custom handling for the Segv backtrace - the unwindstack
-- 
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