Update the Unwinder object and add tests.
Changes:
- Remove unused GetReturnAddressFromDefault function and tests.
- Modify the unwinder to stop when a pc/sp in a device map.
- Modify the unwinder to skip initial frames based on map names.
- Unit tests that exercise all of the paths in the unwinder code.
- Move the test Elf/ElfInterface objects into their own file.
- Update RegsFake to handle extra cases.
- Modify libbacktrace code to use this unwinder.
The new unwinder does not implement the ignore frame functionality since
this is not used very often and is better implemented using a skip frames
in named libraries functionality.
Test: Ran new unit tests, ran backtrace tests.
Change-Id: Ifd65e9acd66ac5e2d0e04bd32a9ad870b54610ff
diff --git a/libunwindstack/tests/ElfFake.cpp b/libunwindstack/tests/ElfFake.cpp
new file mode 100644
index 0000000..71f7f6b
--- /dev/null
+++ b/libunwindstack/tests/ElfFake.cpp
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdint.h>
+
+#include <deque>
+#include <string>
+
+#include <unwindstack/Elf.h>
+#include <unwindstack/ElfInterface.h>
+#include <unwindstack/Memory.h>
+#include <unwindstack/Regs.h>
+
+#include "ElfFake.h"
+#include "RegsFake.h"
+
+namespace unwindstack {
+
+std::deque<FunctionData> ElfInterfaceFake::functions_;
+std::deque<StepData> ElfInterfaceFake::steps_;
+
+bool ElfInterfaceFake::GetFunctionName(uint64_t, std::string* name, uint64_t* offset) {
+ if (functions_.empty()) {
+ return false;
+ }
+ auto entry = functions_.front();
+ functions_.pop_front();
+ *name = entry.name;
+ *offset = entry.offset;
+ return true;
+}
+
+bool ElfInterfaceFake::Step(uint64_t, Regs* regs, Memory*, bool* finished) {
+ if (steps_.empty()) {
+ return false;
+ }
+ auto entry = steps_.front();
+ steps_.pop_front();
+
+ if (entry.pc == 0 && entry.sp == 0 && !entry.finished) {
+ // Pretend as though there is no frame.
+ return false;
+ }
+
+ RegsFake* fake_regs = reinterpret_cast<RegsFake*>(regs);
+ fake_regs->FakeSetPc(entry.pc);
+ fake_regs->FakeSetSp(entry.sp);
+ *finished = entry.finished;
+ return true;
+}
+
+} // namespace unwindstack