Merge llvm-project 12.0.1 release and follow-up fixes

Merge llvm-project main llvmorg-12-init-17869-g8e464dd76bef

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-12-init-17869-g8e464dd76bef, the last commit before the
upstream release/12.x branch was created.

PR:		255570

(cherry picked from commit e8d8bef961a50d4dc22501cde4fb9fb0be1b2532)

Merge llvm-project 12.0.0 release

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-12.0.0-0-gd28af7c654d8, a.k.a. 12.0.0 release.

PR:		255570

(cherry picked from commit d409305fa3838fb39b38c26fc085fb729b8766d5)

Disable strict-fp for powerpcspe, as it does not work properly yet

Merge commit 5c18d1136665 from llvm git (by Qiu Chaofan)

  [SPE] Disable strict-fp for SPE by default

  As discussed in PR50385, strict-fp on PowerPC SPE has not been
  handled well. This patch disables it by default for SPE.

  Reviewed By: nemanjai, vit9696, jhibbits

  Differential Revision: https://reviews.llvm.org/D103235

PR:		255570

(cherry picked from commit 715df83abc049b23d9acddc81f2480bd4c056d64)

Apply upstream libc++ fix to allow building with devel/xxx-xtoolchain-gcc

Merge commit 52e9d80d5db2 from llvm git (by Jason Liu):

  [libc++] add `inline` for __open's definition in ifstream and ofstream

  Summary:

  When building with gcc on AIX, it seems that gcc does not like the
  `always_inline` without the `inline` keyword.
  So adding the inline keywords in for __open in ifstream and ofstream.
  That will also make it consistent with __open in basic_filebuf
  (it seems we added `inline` there before for gcc build as well).

  Differential Revision: https://reviews.llvm.org/D99422

PR:		255570

(cherry picked from commit d099db25464b826c5724cf2fb5b22292bbe15f6e)

Undefine HAVE_(DE)REGISTER_FRAME in llvm's config.h on arm

Otherwise, the lli tool (enable by WITH_CLANG_EXTRAS) won't link on arm,
stating that __register_frame is undefined. This function is normally
provided by libunwind, but explicitly not for the ARM Exception ABI.

Reported by:	oh
PR:		255570

(cherry picked from commit f336b45e943c7f9a90ffcea1a6c4c7039e54c73c)

Merge llvm-project 12.0.1 rc2

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-12.0.1-rc2-0-ge7dac564cd0e, a.k.a. 12.0.1 rc2.

PR:		255570

(cherry picked from commit 23408297fbf3089f0388a8873b02fa75ab3f5bb9)

Revert libunwind change to fix backtrace segfault on aarch64

Revert commit 22b615a96593 from llvm git (by Daniel Kiss):

  [libunwind] Support for leaf function unwinding.

  Unwinding leaf function is useful in cases when the backtrace finds a
  leaf function for example when it caused a signal.
  This patch also add the support for the DW_CFA_undefined because it marks
  the end of the frames.

  Ryan Prichard provided code for the tests.

  Reviewed By: #libunwind, mstorsjo

  Differential Revision: https://reviews.llvm.org/D83573

  Reland with limit the test to the x86_64-linux target.

Bisection has shown that this particular upstream commit causes programs
using backtrace(3) on aarch64 to segfault. This affects the lang/rust
port, for instance. Until we can upstream to fix this problem, revert
the commit for now.

Reported by:	mikael
PR:		256864

(cherry picked from commit 5866c369e4fd917c0d456f0f10b92ee354b82279)

Merge llvm-project 12.0.1 release

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-12.0.1-0-gfed41342a82f, a.k.a. 12.0.1 release.

PR:		255570

(cherry picked from commit 4652422eb477731f284b1345afeefef7f269da50)

compilert-rt: build out-of-line LSE atomics helpers for aarch64

Both clang >= 12 and gcc >= 10.1 now default to -moutline-atomics for
aarch64. This requires a bunch of helper functions in libcompiler_rt.a,
to avoid link errors like "undefined symbol: __aarch64_ldadd8_acq_rel".

(Note: of course you can use -mno-outline-atomics as a workaround too,
but this would negate the potential performance benefit of the faster
LSE instructions.)

Bump __FreeBSD_version so ports maintainers can easily detect this.

PR:		257392

(cherry picked from commit cc55ee8009a550810d38777fd6ace9abf3a2f6b4)

1 files changed, 44 insertions, 26 deletions

diff --git a/contrib/llvm-project/clang/lib/StaticAnalyzer/Checkers/StreamChecker.cpp b/contrib/llvm-project/clang/lib/StaticAnalyzer/Checkers/StreamChecker.cpp
index f6abbe4f8f03..6b176b3c4e2b 100644
--- a/contrib/llvm-project/clang/lib/StaticAnalyzer/Checkers/StreamChecker.cpp
+++ b/contrib/llvm-project/clang/lib/StaticAnalyzer/Checkers/StreamChecker.cpp
@@ -204,7 +204,8 @@ class StreamChecker : public Checker<check::PreCall, eval::Call,
   BugType BT_IllegalWhence{this, "Illegal whence argument",
                            "Stream handling error"};
   BugType BT_StreamEof{this, "Stream already in EOF", "Stream handling error"};
-  BugType BT_ResourceLeak{this, "Resource leak", "Stream handling error"};
+  BugType BT_ResourceLeak{this, "Resource leak", "Stream handling error",
+                          /*SuppressOnSink =*/true};
 
 public:
   void checkPreCall(const CallEvent &Call, CheckerContext &C) const;
@@ -337,6 +338,12 @@ private:
   /// to ensure uniform handling.
   void reportFEofWarning(CheckerContext &C, ProgramStateRef State) const;
 
+  /// Emit resource leak warnings for the given symbols.
+  /// Createn a non-fatal error node for these, and returns it (if any warnings
+  /// were generated). Return value is non-null.
+  ExplodedNode *reportLeaks(const SmallVector<SymbolRef, 2> &LeakedSyms,
+                            CheckerContext &C, ExplodedNode *Pred) const;
+
   /// Find the description data of the function called by a call event.
   /// Returns nullptr if no function is recognized.
   const FnDescription *lookupFn(const CallEvent &Call) const {
@@ -956,28 +963,14 @@ void StreamChecker::reportFEofWarning(CheckerContext &C,
   C.addTransition(State);
 }
 
-void StreamChecker::checkDeadSymbols(SymbolReaper &SymReaper,
-                                     CheckerContext &C) const {
-  ProgramStateRef State = C.getState();
-
-  // TODO: Clean up the state.
-  const StreamMapTy &Map = State->get<StreamMap>();
-  for (const auto &I : Map) {
-    SymbolRef Sym = I.first;
-    const StreamState &SS = I.second;
-    if (!SymReaper.isDead(Sym) || !SS.isOpened())
-      continue;
-
-    ExplodedNode *N = C.generateErrorNode();
-    if (!N)
-      continue;
-
-    // Do not warn for non-closed stream at program exit.
-    ExplodedNode *Pred = C.getPredecessor();
-    if (Pred && Pred->getCFGBlock() &&
-        Pred->getCFGBlock()->hasNoReturnElement())
-      continue;
+ExplodedNode *
+StreamChecker::reportLeaks(const SmallVector<SymbolRef, 2> &LeakedSyms,
+                           CheckerContext &C, ExplodedNode *Pred) const {
+  ExplodedNode *Err = C.generateNonFatalErrorNode(C.getState(), Pred);
+  if (!Err)
+    return Pred;
 
+  for (SymbolRef LeakSym : LeakedSyms) {
     // Resource leaks can result in multiple warning that describe the same kind
     // of programming error:
     //  void f() {
@@ -989,8 +982,7 @@ void StreamChecker::checkDeadSymbols(SymbolReaper &SymReaper,
     // from a different kinds of errors), the reduction in redundant reports
     // makes this a worthwhile heuristic.
     // FIXME: Add a checker option to turn this uniqueing feature off.
-
-    const ExplodedNode *StreamOpenNode = getAcquisitionSite(N, Sym, C);
+    const ExplodedNode *StreamOpenNode = getAcquisitionSite(Err, LeakSym, C);
     assert(StreamOpenNode && "Could not find place of stream opening.");
     PathDiagnosticLocation LocUsedForUniqueing =
         PathDiagnosticLocation::createBegin(
@@ -1000,12 +992,38 @@ void StreamChecker::checkDeadSymbols(SymbolReaper &SymReaper,
     std::unique_ptr<PathSensitiveBugReport> R =
         std::make_unique<PathSensitiveBugReport>(
             BT_ResourceLeak,
-            "Opened stream never closed. Potential resource leak.", N,
+            "Opened stream never closed. Potential resource leak.", Err,
             LocUsedForUniqueing,
             StreamOpenNode->getLocationContext()->getDecl());
-    R->markInteresting(Sym);
+    R->markInteresting(LeakSym);
     C.emitReport(std::move(R));
   }
+
+  return Err;
+}
+
+void StreamChecker::checkDeadSymbols(SymbolReaper &SymReaper,
+                                     CheckerContext &C) const {
+  ProgramStateRef State = C.getState();
+
+  llvm::SmallVector<SymbolRef, 2> LeakedSyms;
+
+  const StreamMapTy &Map = State->get<StreamMap>();
+  for (const auto &I : Map) {
+    SymbolRef Sym = I.first;
+    const StreamState &SS = I.second;
+    if (!SymReaper.isDead(Sym))
+      continue;
+    if (SS.isOpened())
+      LeakedSyms.push_back(Sym);
+    State = State->remove<StreamMap>(Sym);
+  }
+
+  ExplodedNode *N = C.getPredecessor();
+  if (!LeakedSyms.empty())
+    N = reportLeaks(LeakedSyms, C, N);
+
+  C.addTransition(State, N);
 }
 
 ProgramStateRef StreamChecker::checkPointerEscape(