Add ability to read jit gdb data.
Changes:
- New JitDebug class to handle all of the jit gdb interface.
- Add unit tests for all, along with new offline test using debug data.
- Add new Memory type called MemoryOfflineParts that has multiple
MemoryOffline objects to support the offline test.
- Update the tools to use the JitDebug object.
- Modify libbacktrace to use the JitDebug, but only looking in libart.so
and libartd.so.
- Change the Format32Bits to Is32Bit since it's more accurate and I use
it in a different context where original name didn't make sense.
- Add a new function to find global variables in an elf file
(GetGlobalVariable).
- Add a new function to determine if a pc is valid for this elf (IsValidPc).
Bug: 68396769
Test: Ran new unit tests. Added new offline test that uses jit debug data.
Test: Ran art test that generates jit data and verified a crash unwinds
Test: through the jit data.
Change-Id: I6e7ee2f5bab2242028a06feece156dff21c0a974
diff --git a/libbacktrace/UnwindStack.cpp b/libbacktrace/UnwindStack.cpp
index 2a555af..b0345a1 100644
--- a/libbacktrace/UnwindStack.cpp
+++ b/libbacktrace/UnwindStack.cpp
@@ -50,6 +50,7 @@
auto process_memory = stack_map->process_memory();
unwindstack::Unwinder unwinder(MAX_BACKTRACE_FRAMES + num_ignore_frames, stack_map->stack_maps(),
regs, stack_map->process_memory());
+ unwinder.SetJitDebug(stack_map->GetJitDebug(), regs->Arch());
unwinder.Unwind(skip_names, &stack_map->GetSuffixesToIgnore());
if (num_ignore_frames >= unwinder.NumFrames()) {
diff --git a/libbacktrace/UnwindStackMap.cpp b/libbacktrace/UnwindStackMap.cpp
index 836a774..93406dc 100644
--- a/libbacktrace/UnwindStackMap.cpp
+++ b/libbacktrace/UnwindStackMap.cpp
@@ -18,6 +18,9 @@
#include <stdlib.h>
#include <sys/types.h>
+#include <string>
+#include <vector>
+
#include <backtrace/BacktraceMap.h>
#include <unwindstack/Elf.h>
#include <unwindstack/MapInfo.h>
@@ -39,6 +42,10 @@
// Create the process memory object.
process_memory_ = unwindstack::Memory::CreateProcessMemory(pid_);
+ // Create a JitDebug object for getting jit unwind information.
+ std::vector<std::string> search_libs_{"libart.so", "libartd.so"};
+ jit_debug_.reset(new unwindstack::JitDebug(process_memory_, search_libs_));
+
if (!stack_maps_->Parse()) {
return false;
}
diff --git a/libbacktrace/UnwindStackMap.h b/libbacktrace/UnwindStackMap.h
index 2f63655..12c5909 100644
--- a/libbacktrace/UnwindStackMap.h
+++ b/libbacktrace/UnwindStackMap.h
@@ -23,6 +23,7 @@
#include <memory>
#include <backtrace/BacktraceMap.h>
+#include <unwindstack/JitDebug.h>
#include <unwindstack/Maps.h>
class UnwindStackMap : public BacktraceMap {
@@ -41,11 +42,14 @@
const std::shared_ptr<unwindstack::Memory>& process_memory() { return process_memory_; }
+ unwindstack::JitDebug* GetJitDebug() { return jit_debug_.get(); }
+
protected:
uint64_t GetLoadBias(size_t index) override;
std::unique_ptr<unwindstack::Maps> stack_maps_;
std::shared_ptr<unwindstack::Memory> process_memory_;
+ std::unique_ptr<unwindstack::JitDebug> jit_debug_;
};
#endif // _LIBBACKTRACE_UNWINDSTACK_MAP_H