Add custom SIGSEGV handler to help find heap corruption.
The new signal handler prints heap diagnostics when you get a SIGSEGV.
Added a fault message member in runtime which is modifiable by
Runtime::SetFaultMessage. When you get a SIGSEGV it will print out
whatever is stored in this string as well as the normal information.
This is useful for debugging heap corruption since it lets you see
which threads were in which methods when the last GC occured.
Added some smarter object dumping logic when the faulting address is
in the heap.
Bug: 12934910
Change-Id: Ia72be2c39f70ad711cbd746d66fad2b617d5d29f
diff --git a/runtime/gc/space/bump_pointer_space.cc b/runtime/gc/space/bump_pointer_space.cc
index 43674ea..fcd3b70 100644
--- a/runtime/gc/space/bump_pointer_space.cc
+++ b/runtime/gc/space/bump_pointer_space.cc
@@ -61,6 +61,9 @@
void BumpPointerSpace::Clear() {
// Release the pages back to the operating system.
CHECK_NE(madvise(Begin(), Limit() - Begin(), MADV_DONTNEED), -1) << "madvise failed";
+}
+
+void BumpPointerSpace::Reset() {
// Reset the end of the space back to the beginning, we move the end forward as we allocate
// objects.
SetEnd(Begin());
@@ -75,8 +78,9 @@
}
void BumpPointerSpace::Dump(std::ostream& os) const {
- os << reinterpret_cast<void*>(Begin()) << "-" << reinterpret_cast<void*>(End()) << " - "
- << reinterpret_cast<void*>(Limit());
+ os << GetName() << " "
+ << reinterpret_cast<void*>(Begin()) << "-" << reinterpret_cast<void*>(End()) << " - "
+ << reinterpret_cast<void*>(Limit());
}
mirror::Object* BumpPointerSpace::GetNextObject(mirror::Object* obj) {