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-rw-r--r--runtime/jdwp/jdwp_event.cc47
-rw-r--r--runtime/reference_table.cc96
-rw-r--r--runtime/reference_table_test.cc73
3 files changed, 173 insertions, 43 deletions
diff --git a/runtime/jdwp/jdwp_event.cc b/runtime/jdwp/jdwp_event.cc
index 06b67b3e4d..0d862fe672 100644
--- a/runtime/jdwp/jdwp_event.cc
+++ b/runtime/jdwp/jdwp_event.cc
@@ -621,8 +621,8 @@ void JdwpState::SendRequestAndPossiblySuspend(ExpandBuf* pReq, JdwpSuspendPolicy
Thread* const self = Thread::Current();
self->AssertThreadSuspensionIsAllowable();
CHECK(pReq != nullptr);
+ CHECK_EQ(threadId, Dbg::GetThreadSelfId()) << "Only the current thread can suspend itself";
/* send request and possibly suspend ourselves */
- JDWP::ObjectId thread_self_id = Dbg::GetThreadSelfId();
ScopedThreadSuspension sts(self, kWaitingForDebuggerSend);
if (suspend_policy != SP_NONE) {
AcquireJdwpTokenForEvent(threadId);
@@ -631,7 +631,7 @@ void JdwpState::SendRequestAndPossiblySuspend(ExpandBuf* pReq, JdwpSuspendPolicy
{
// Before suspending, we change our state to kSuspended so the debugger sees us as RUNNING.
ScopedThreadStateChange stsc(self, kSuspended);
- SuspendByPolicy(suspend_policy, thread_self_id);
+ SuspendByPolicy(suspend_policy, threadId);
}
}
@@ -658,13 +658,10 @@ void JdwpState::ReleaseJdwpTokenForCommand() {
}
void JdwpState::AcquireJdwpTokenForEvent(ObjectId threadId) {
- CHECK_NE(Thread::Current(), GetDebugThread()) << "Expected event thread";
- CHECK_NE(debug_thread_id_, threadId) << "Not expected debug thread";
SetWaitForJdwpToken(threadId);
}
void JdwpState::ReleaseJdwpTokenForEvent() {
- CHECK_NE(Thread::Current(), GetDebugThread()) << "Expected event thread";
ClearWaitForJdwpToken();
}
@@ -685,23 +682,28 @@ void JdwpState::SetWaitForJdwpToken(ObjectId threadId) {
/* this is held for very brief periods; contention is unlikely */
MutexLock mu(self, jdwp_token_lock_);
- CHECK_NE(jdwp_token_owner_thread_id_, threadId) << "Thread is already holding event thread lock";
+ if (jdwp_token_owner_thread_id_ == threadId) {
+ // Only the debugger thread may already hold the event token. For instance, it may trigger
+ // a CLASS_PREPARE event while processing a command that initializes a class.
+ CHECK_EQ(threadId, debug_thread_id_) << "Non-debugger thread is already holding event token";
+ } else {
+ /*
+ * If another thread is already doing stuff, wait for it. This can
+ * go to sleep indefinitely.
+ */
- /*
- * If another thread is already doing stuff, wait for it. This can
- * go to sleep indefinitely.
- */
- while (jdwp_token_owner_thread_id_ != 0) {
- VLOG(jdwp) << StringPrintf("event in progress (%#" PRIx64 "), %#" PRIx64 " sleeping",
- jdwp_token_owner_thread_id_, threadId);
- waited = true;
- jdwp_token_cond_.Wait(self);
- }
+ while (jdwp_token_owner_thread_id_ != 0) {
+ VLOG(jdwp) << StringPrintf("event in progress (%#" PRIx64 "), %#" PRIx64 " sleeping",
+ jdwp_token_owner_thread_id_, threadId);
+ waited = true;
+ jdwp_token_cond_.Wait(self);
+ }
- if (waited || threadId != debug_thread_id_) {
- VLOG(jdwp) << StringPrintf("event token grabbed (%#" PRIx64 ")", threadId);
+ if (waited || threadId != debug_thread_id_) {
+ VLOG(jdwp) << StringPrintf("event token grabbed (%#" PRIx64 ")", threadId);
+ }
+ jdwp_token_owner_thread_id_ = threadId;
}
- jdwp_token_owner_thread_id_ = threadId;
}
/*
@@ -1224,14 +1226,15 @@ void JdwpState::PostClassPrepare(mirror::Class* klass) {
VLOG(jdwp) << " suspend_policy=" << suspend_policy;
}
- if (thread_id == debug_thread_id_) {
+ ObjectId reported_thread_id = thread_id;
+ if (reported_thread_id == debug_thread_id_) {
/*
* JDWP says that, for a class prep in the debugger thread, we
* should set thread to null and if any threads were supposed
* to be suspended then we suspend all other threads.
*/
VLOG(jdwp) << " NOTE: class prepare in debugger thread!";
- thread_id = 0;
+ reported_thread_id = 0;
if (suspend_policy == SP_EVENT_THREAD) {
suspend_policy = SP_ALL;
}
@@ -1244,7 +1247,7 @@ void JdwpState::PostClassPrepare(mirror::Class* klass) {
for (const JdwpEvent* pEvent : match_list) {
expandBufAdd1(pReq, pEvent->eventKind);
expandBufAdd4BE(pReq, pEvent->requestId);
- expandBufAddObjectId(pReq, thread_id);
+ expandBufAddObjectId(pReq, reported_thread_id);
expandBufAdd1(pReq, tag);
expandBufAddRefTypeId(pReq, class_id);
expandBufAddUtf8String(pReq, signature);
diff --git a/runtime/reference_table.cc b/runtime/reference_table.cc
index d4bd6dd247..62e23ed92b 100644
--- a/runtime/reference_table.cc
+++ b/runtime/reference_table.cc
@@ -215,33 +215,87 @@ void ReferenceTable::Dump(std::ostream& os, Table& entries) {
}
std::sort(sorted_entries.begin(), sorted_entries.end(), GcRootComparator());
- // Dump a summary of the whole table.
- os << " Summary:\n";
- size_t equiv = 0;
- size_t identical = 0;
- mirror::Object* prev = nullptr;
- for (GcRoot<mirror::Object>& root : sorted_entries) {
- mirror::Object* current = root.Read<kWithoutReadBarrier>();
- if (prev != nullptr) {
- const size_t element_count = GetElementCount(prev);
- if (current == prev) {
+ class SummaryElement {
+ public:
+ GcRoot<mirror::Object> root;
+ size_t equiv;
+ size_t identical;
+
+ SummaryElement() : equiv(0), identical(0) {}
+ SummaryElement(SummaryElement&& ref) {
+ root = ref.root;
+ equiv = ref.equiv;
+ identical = ref.identical;
+ }
+ SummaryElement(const SummaryElement&) = default;
+ SummaryElement& operator=(SummaryElement&&) = default;
+
+ void Reset(GcRoot<mirror::Object>& _root) {
+ root = _root;
+ equiv = 0;
+ identical = 0;
+ }
+ };
+ std::vector<SummaryElement> sorted_summaries;
+ {
+ SummaryElement prev;
+
+ for (GcRoot<mirror::Object>& root : sorted_entries) {
+ mirror::Object* current = root.Read<kWithoutReadBarrier>();
+
+ if (UNLIKELY(prev.root.IsNull())) {
+ prev.Reset(root);
+ continue;
+ }
+
+ mirror::Object* prevObj = prev.root.Read<kWithoutReadBarrier>();
+ if (current == prevObj) {
// Same reference, added more than once.
- ++identical;
- } else if (current->GetClass() == prev->GetClass() &&
- GetElementCount(current) == element_count) {
+ ++prev.identical;
+ } else if (current->GetClass() == prevObj->GetClass() &&
+ GetElementCount(current) == GetElementCount(prevObj)) {
// Same class / element count, different object.
- ++equiv;
+ ++prev.equiv;
} else {
- // Different class.
- DumpSummaryLine(os, prev, element_count, identical, equiv);
- equiv = 0;
- identical = 0;
+ sorted_summaries.push_back(prev);
+ prev.Reset(root);
}
+ prev.root = root;
}
- prev = current;
+ sorted_summaries.push_back(prev);
+
+ // Compare summary elements, first by combined count, then by identical (indicating leaks),
+ // then by class (and size and address).
+ struct SummaryElementComparator {
+ GcRootComparator gc_root_cmp;
+
+ bool operator()(SummaryElement& elem1, SummaryElement& elem2) const
+ NO_THREAD_SAFETY_ANALYSIS {
+ Locks::mutator_lock_->AssertSharedHeld(Thread::Current());
+
+ size_t count1 = elem1.equiv + elem1.identical;
+ size_t count2 = elem2.equiv + elem2.identical;
+ if (count1 != count2) {
+ return count1 > count2;
+ }
+
+ if (elem1.identical != elem2.identical) {
+ return elem1.identical > elem2.identical;
+ }
+
+ // Otherwise, compare the GC roots as before.
+ return gc_root_cmp(elem1.root, elem2.root);
+ }
+ };
+ std::sort(sorted_summaries.begin(), sorted_summaries.end(), SummaryElementComparator());
+ }
+
+ // Dump a summary of the whole table.
+ os << " Summary:\n";
+ for (SummaryElement& elem : sorted_summaries) {
+ mirror::Object* elemObj = elem.root.Read<kWithoutReadBarrier>();
+ DumpSummaryLine(os, elemObj, GetElementCount(elemObj), elem.identical, elem.equiv);
}
- // Handle the last entry.
- DumpSummaryLine(os, prev, GetElementCount(prev), identical, equiv);
}
void ReferenceTable::VisitRoots(RootVisitor* visitor, const RootInfo& root_info) {
diff --git a/runtime/reference_table_test.cc b/runtime/reference_table_test.cc
index fae8e722c3..c48edbe0cf 100644
--- a/runtime/reference_table_test.cc
+++ b/runtime/reference_table_test.cc
@@ -106,4 +106,77 @@ TEST_F(ReferenceTableTest, Basics) {
}
}
+static std::vector<size_t> FindAll(const std::string& haystack, const char* needle) {
+ std::vector<size_t> res;
+ size_t start = 0;
+ do {
+ size_t pos = haystack.find(needle, start);
+ if (pos == std::string::npos) {
+ break;
+ }
+ res.push_back(pos);
+ start = pos + 1;
+ } while (start < haystack.size());
+ return res;
+}
+
+TEST_F(ReferenceTableTest, SummaryOrder) {
+ // Check that the summary statistics are sorted.
+ ScopedObjectAccess soa(Thread::Current());
+
+ ReferenceTable rt("test", 0, 20);
+
+ {
+ mirror::Object* s1 = mirror::String::AllocFromModifiedUtf8(soa.Self(), "hello");
+ mirror::Object* s2 = mirror::String::AllocFromModifiedUtf8(soa.Self(), "world");
+
+ // 3 copies of s1, 2 copies of s2, interleaved.
+ for (size_t i = 0; i != 2; ++i) {
+ rt.Add(s1);
+ rt.Add(s2);
+ }
+ rt.Add(s1);
+ }
+
+ {
+ // Differently sized byte arrays. Should be sorted by identical (non-unique cound).
+ mirror::Object* b1_1 = mirror::ByteArray::Alloc(soa.Self(), 1);
+ rt.Add(b1_1);
+ rt.Add(mirror::ByteArray::Alloc(soa.Self(), 2));
+ rt.Add(b1_1);
+ rt.Add(mirror::ByteArray::Alloc(soa.Self(), 2));
+ rt.Add(mirror::ByteArray::Alloc(soa.Self(), 1));
+ rt.Add(mirror::ByteArray::Alloc(soa.Self(), 2));
+ }
+
+ rt.Add(mirror::CharArray::Alloc(soa.Self(), 0));
+
+ // Now dump, and ensure order.
+ std::ostringstream oss;
+ rt.Dump(oss);
+
+ // Only do this on the part after Summary.
+ std::string base = oss.str();
+ size_t summary_pos = base.find("Summary:");
+ ASSERT_NE(summary_pos, std::string::npos);
+
+ std::string haystack = base.substr(summary_pos);
+
+ std::vector<size_t> strCounts = FindAll(haystack, "java.lang.String");
+ std::vector<size_t> b1Counts = FindAll(haystack, "byte[] (1 elements)");
+ std::vector<size_t> b2Counts = FindAll(haystack, "byte[] (2 elements)");
+ std::vector<size_t> cCounts = FindAll(haystack, "char[]");
+
+ // Only one each.
+ EXPECT_EQ(1u, strCounts.size());
+ EXPECT_EQ(1u, b1Counts.size());
+ EXPECT_EQ(1u, b2Counts.size());
+ EXPECT_EQ(1u, cCounts.size());
+
+ // Expect them to be in order.
+ EXPECT_LT(strCounts[0], b1Counts[0]);
+ EXPECT_LT(b1Counts[0], b2Counts[0]);
+ EXPECT_LT(b2Counts[0], cCounts[0]);
+}
+
} // namespace art
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