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, 56 insertions, 7 deletions

diff --git a/contrib/llvm-project/llvm/lib/MC/MCStreamer.cpp b/contrib/llvm-project/llvm/lib/MC/MCStreamer.cpp
index 6d3a933c96a3..4b5ae3cc202d 100644
--- a/contrib/llvm-project/llvm/lib/MC/MCStreamer.cpp
+++ b/contrib/llvm-project/llvm/lib/MC/MCStreamer.cpp
@@ -22,6 +22,7 @@
 #include "llvm/MC/MCInst.h"
 #include "llvm/MC/MCInstPrinter.h"
 #include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCPseudoProbe.h"
 #include "llvm/MC/MCRegister.h"
 #include "llvm/MC/MCRegisterInfo.h"
 #include "llvm/MC/MCSection.h"
@@ -90,7 +91,7 @@ void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
 
 MCStreamer::MCStreamer(MCContext &Ctx)
     : Context(Ctx), CurrentWinFrameInfo(nullptr),
-      UseAssemblerInfoForParsing(false) {
+      CurrentProcWinFrameInfoStartIndex(0), UseAssemblerInfoForParsing(false) {
   SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
 }
 
@@ -138,6 +139,21 @@ void MCStreamer::emitIntValue(uint64_t Value, unsigned Size) {
   unsigned Index = IsLittleEndian ? 0 : 8 - Size;
   emitBytes(StringRef(reinterpret_cast<char *>(&Swapped) + Index, Size));
 }
+void MCStreamer::emitIntValue(APInt Value) {
+  if (Value.getNumWords() == 1) {
+    emitIntValue(Value.getLimitedValue(), Value.getBitWidth() / 8);
+    return;
+  }
+
+  const bool IsLittleEndianTarget = Context.getAsmInfo()->isLittleEndian();
+  const bool ShouldSwap = sys::IsLittleEndianHost != IsLittleEndianTarget;
+  const APInt Swapped = ShouldSwap ? Value.byteSwap() : Value;
+  const unsigned Size = Value.getBitWidth() / 8;
+  SmallString<10> Tmp;
+  Tmp.resize(Size);
+  StoreIntToMemory(Swapped, reinterpret_cast<uint8_t *>(Tmp.data()), Size);
+  emitBytes(Tmp.str());
+}
 
 /// EmitULEB128IntValue - Special case of EmitULEB128Value that avoids the
 /// client having to pass in a MCExpr for constant integers.
@@ -202,6 +218,9 @@ void MCStreamer::emitFill(uint64_t NumBytes, uint8_t FillValue) {
   emitFill(*MCConstantExpr::create(NumBytes, getContext()), FillValue);
 }
 
+void llvm::MCStreamer::emitNops(int64_t NumBytes, int64_t ControlledNopLen,
+                                llvm::SMLoc) {}
+
 /// The implementation in this class just redirects to emitFill.
 void MCStreamer::emitZeros(uint64_t NumBytes) { emitFill(NumBytes, 0); }
 
@@ -255,9 +274,9 @@ bool MCStreamer::hasUnfinishedDwarfFrameInfo() {
 
 MCDwarfFrameInfo *MCStreamer::getCurrentDwarfFrameInfo() {
   if (!hasUnfinishedDwarfFrameInfo()) {
-    getContext().reportError(SMLoc(), "this directive must appear between "
-                                      ".cfi_startproc and .cfi_endproc "
-                                      "directives");
+    getContext().reportError(getStartTokLoc(),
+                             "this directive must appear between "
+                             ".cfi_startproc and .cfi_endproc directives");
     return nullptr;
   }
   return &DwarfFrameInfos.back();
@@ -674,6 +693,7 @@ void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol, SMLoc Loc) {
 
   MCSymbol *StartProc = emitCFILabel();
 
+  CurrentProcWinFrameInfoStartIndex = WinFrameInfos.size();
   WinFrameInfos.emplace_back(
       std::make_unique<WinEH::FrameInfo>(Symbol, StartProc));
   CurrentWinFrameInfo = WinFrameInfos.back().get();
@@ -689,6 +709,13 @@ void MCStreamer::EmitWinCFIEndProc(SMLoc Loc) {
 
   MCSymbol *Label = emitCFILabel();
   CurFrame->End = Label;
+  if (!CurFrame->FuncletOrFuncEnd)
+    CurFrame->FuncletOrFuncEnd = CurFrame->End;
+
+  for (size_t I = CurrentProcWinFrameInfoStartIndex, E = WinFrameInfos.size();
+       I != E; ++I)
+    EmitWindowsUnwindTables(WinFrameInfos[I].get());
+  SwitchSection(CurFrame->TextSection);
 }
 
 void MCStreamer::EmitWinCFIFuncletOrFuncEnd(SMLoc Loc) {
@@ -947,10 +974,13 @@ void MCStreamer::emitRawText(const Twine &T) {
 void MCStreamer::EmitWindowsUnwindTables() {
 }
 
-void MCStreamer::Finish() {
+void MCStreamer::EmitWindowsUnwindTables(WinEH::FrameInfo *Frame) {
+}
+
+void MCStreamer::Finish(SMLoc EndLoc) {
   if ((!DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End) ||
       (!WinFrameInfos.empty() && !WinFrameInfos.back()->End)) {
-    getContext().reportError(SMLoc(), "Unfinished frame!");
+    getContext().reportError(EndLoc, "Unfinished frame!");
     return;
   }
 
@@ -1013,6 +1043,25 @@ void MCStreamer::emitInstruction(const MCInst &Inst, const MCSubtargetInfo &) {
       visitUsedExpr(*Inst.getOperand(i).getExpr());
 }
 
+void MCStreamer::emitPseudoProbe(uint64_t Guid, uint64_t Index, uint64_t Type,
+                                 uint64_t Attr,
+                                 const MCPseudoProbeInlineStack &InlineStack) {
+  auto &Context = getContext();
+
+  // Create a symbol at in the current section for use in the probe.
+  MCSymbol *ProbeSym = Context.createTempSymbol();
+
+  // Set the value of the symbol to use for the MCPseudoProbe.
+  emitLabel(ProbeSym);
+
+  // Create a (local) probe entry with the symbol.
+  MCPseudoProbe Probe(ProbeSym, Guid, Index, Type, Attr);
+
+  // Add the probe entry to this section's entries.
+  Context.getMCPseudoProbeTable().getProbeSections().addPseudoProbe(
+      getCurrentSectionOnly(), Probe, InlineStack);
+}
+
 void MCStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
                                         unsigned Size) {
   // Get the Hi-Lo expression.
@@ -1027,7 +1076,7 @@ void MCStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
   }
 
   // Otherwise, emit with .set (aka assignment).
-  MCSymbol *SetLabel = Context.createTempSymbol("set", true);
+  MCSymbol *SetLabel = Context.createTempSymbol("set");
   emitAssignment(SetLabel, Diff);
   emitSymbolValue(SetLabel, Size);
 }