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, 128 insertions, 44 deletions

diff --git a/contrib/llvm-project/lldb/source/Plugins/Process/Utility/LinuxProcMaps.cpp b/contrib/llvm-project/lldb/source/Plugins/Process/Utility/LinuxProcMaps.cpp
index 0c7d9ddc5ac6..947b970edf6c 100644
--- a/contrib/llvm-project/lldb/source/Plugins/Process/Utility/LinuxProcMaps.cpp
+++ b/contrib/llvm-project/lldb/source/Plugins/Process/Utility/LinuxProcMaps.cpp
@@ -7,80 +7,93 @@
 //===----------------------------------------------------------------------===//
 
 #include "LinuxProcMaps.h"
-#include "llvm/ADT/StringRef.h"
 #include "lldb/Target/MemoryRegionInfo.h"
 #include "lldb/Utility/Status.h"
 #include "lldb/Utility/StringExtractor.h"
+#include "llvm/ADT/StringRef.h"
 
 using namespace lldb_private;
 
-static Status
+enum class MapsKind { Maps, SMaps };
+
+static llvm::Expected<MemoryRegionInfo> ProcMapError(const char *msg,
+                                                     MapsKind kind) {
+  return llvm::createStringError(llvm::inconvertibleErrorCode(), msg,
+                                 kind == MapsKind::Maps ? "maps" : "smaps");
+}
+
+static llvm::Expected<MemoryRegionInfo>
 ParseMemoryRegionInfoFromProcMapsLine(llvm::StringRef maps_line,
-                                      MemoryRegionInfo &memory_region_info) {
-  memory_region_info.Clear();
-  
+                                      MapsKind maps_kind) {
+  MemoryRegionInfo region;
   StringExtractor line_extractor(maps_line);
-  
+
   // Format: {address_start_hex}-{address_end_hex} perms offset  dev   inode
   // pathname perms: rwxp   (letter is present if set, '-' if not, final
   // character is p=private, s=shared).
-  
+
   // Parse out the starting address
   lldb::addr_t start_address = line_extractor.GetHexMaxU64(false, 0);
-  
+
   // Parse out hyphen separating start and end address from range.
   if (!line_extractor.GetBytesLeft() || (line_extractor.GetChar() != '-'))
-    return Status(
-        "malformed /proc/{pid}/maps entry, missing dash between address range");
-  
+    return ProcMapError(
+        "malformed /proc/{pid}/%s entry, missing dash between address range",
+        maps_kind);
+
   // Parse out the ending address
   lldb::addr_t end_address = line_extractor.GetHexMaxU64(false, start_address);
-  
+
   // Parse out the space after the address.
   if (!line_extractor.GetBytesLeft() || (line_extractor.GetChar() != ' '))
-    return Status(
-        "malformed /proc/{pid}/maps entry, missing space after range");
-  
+    return ProcMapError(
+        "malformed /proc/{pid}/%s entry, missing space after range", maps_kind);
+
   // Save the range.
-  memory_region_info.GetRange().SetRangeBase(start_address);
-  memory_region_info.GetRange().SetRangeEnd(end_address);
-  
-  // Any memory region in /proc/{pid}/maps is by definition mapped into the
-  // process.
-  memory_region_info.SetMapped(MemoryRegionInfo::OptionalBool::eYes);
-  
+  region.GetRange().SetRangeBase(start_address);
+  region.GetRange().SetRangeEnd(end_address);
+
+  // Any memory region in /proc/{pid}/(maps|smaps) is by definition mapped
+  // into the process.
+  region.SetMapped(MemoryRegionInfo::OptionalBool::eYes);
+
   // Parse out each permission entry.
   if (line_extractor.GetBytesLeft() < 4)
-    return Status("malformed /proc/{pid}/maps entry, missing some portion of "
-                  "permissions");
-  
+    return ProcMapError(
+        "malformed /proc/{pid}/%s entry, missing some portion of "
+        "permissions",
+        maps_kind);
+
   // Handle read permission.
   const char read_perm_char = line_extractor.GetChar();
   if (read_perm_char == 'r')
-    memory_region_info.SetReadable(MemoryRegionInfo::OptionalBool::eYes);
+    region.SetReadable(MemoryRegionInfo::OptionalBool::eYes);
   else if (read_perm_char == '-')
-    memory_region_info.SetReadable(MemoryRegionInfo::OptionalBool::eNo);
+    region.SetReadable(MemoryRegionInfo::OptionalBool::eNo);
   else
-    return Status("unexpected /proc/{pid}/maps read permission char");
-  
+    return ProcMapError("unexpected /proc/{pid}/%s read permission char",
+                        maps_kind);
+
   // Handle write permission.
   const char write_perm_char = line_extractor.GetChar();
   if (write_perm_char == 'w')
-    memory_region_info.SetWritable(MemoryRegionInfo::OptionalBool::eYes);
+    region.SetWritable(MemoryRegionInfo::OptionalBool::eYes);
   else if (write_perm_char == '-')
-    memory_region_info.SetWritable(MemoryRegionInfo::OptionalBool::eNo);
+    region.SetWritable(MemoryRegionInfo::OptionalBool::eNo);
   else
-    return Status("unexpected /proc/{pid}/maps write permission char");
-  
+    return ProcMapError("unexpected /proc/{pid}/%s write permission char",
+                        maps_kind);
+
   // Handle execute permission.
   const char exec_perm_char = line_extractor.GetChar();
   if (exec_perm_char == 'x')
-    memory_region_info.SetExecutable(MemoryRegionInfo::OptionalBool::eYes);
+    region.SetExecutable(MemoryRegionInfo::OptionalBool::eYes);
   else if (exec_perm_char == '-')
-    memory_region_info.SetExecutable(MemoryRegionInfo::OptionalBool::eNo);
+    region.SetExecutable(MemoryRegionInfo::OptionalBool::eNo);
   else
-    return Status("unexpected /proc/{pid}/maps exec permission char");
-  
+    return ProcMapError("unexpected /proc/{pid}/%s exec permission char",
+                        maps_kind);
+
   line_extractor.GetChar();              // Read the private bit
   line_extractor.SkipSpaces();           // Skip the separator
   line_extractor.GetHexMaxU64(false, 0); // Read the offset
@@ -89,13 +102,13 @@ ParseMemoryRegionInfoFromProcMapsLine(llvm::StringRef maps_line,
   line_extractor.GetHexMaxU64(false, 0); // Read the major device number
   line_extractor.SkipSpaces();           // Skip the separator
   line_extractor.GetU64(0, 10);          // Read the inode number
-  
+
   line_extractor.SkipSpaces();
   const char *name = line_extractor.Peek();
   if (name)
-    memory_region_info.SetName(name);
-  
-  return Status();
+    region.SetName(name);
+
+  return region;
 }
 
 void lldb_private::ParseLinuxMapRegions(llvm::StringRef linux_map,
@@ -104,9 +117,80 @@ void lldb_private::ParseLinuxMapRegions(llvm::StringRef linux_map,
   llvm::StringRef line;
   while (!lines.empty()) {
     std::tie(line, lines) = lines.split('\n');
-    MemoryRegionInfo region;
-    Status error = ParseMemoryRegionInfoFromProcMapsLine(line, region);
-    if (!callback(region, error))
+    if (!callback(ParseMemoryRegionInfoFromProcMapsLine(line, MapsKind::Maps)))
       break;
   }
 }
+
+void lldb_private::ParseLinuxSMapRegions(llvm::StringRef linux_smap,
+                                         LinuxMapCallback const &callback) {
+  // Entries in /smaps look like:
+  // 00400000-0048a000 r-xp 00000000 fd:03 960637
+  // Size:                552 kB
+  // Rss:                 460 kB
+  // <...>
+  // VmFlags: rd ex mr mw me dw
+  // 00500000-0058a000 rwxp 00000000 fd:03 960637
+  // <...>
+  //
+  // Where the first line is identical to the /maps format
+  // and VmFlags is only printed for kernels >= 3.8.
+
+  llvm::StringRef lines(linux_smap);
+  llvm::StringRef line;
+  llvm::Optional<MemoryRegionInfo> region;
+
+  while (lines.size()) {
+    std::tie(line, lines) = lines.split('\n');
+
+    // A property line looks like:
+    // <word>: <value>
+    // (no spaces on the left hand side)
+    // A header will have a ':' but the LHS will contain spaces
+    llvm::StringRef name;
+    llvm::StringRef value;
+    std::tie(name, value) = line.split(':');
+
+    // If this line is a property line
+    if (!name.contains(' ')) {
+      if (region) {
+        if (name == "VmFlags") {
+          if (value.contains("mt"))
+            region->SetMemoryTagged(MemoryRegionInfo::eYes);
+          else
+            region->SetMemoryTagged(MemoryRegionInfo::eNo);
+        }
+        // Ignore anything else
+      } else {
+        // Orphaned settings line
+        callback(ProcMapError(
+            "Found a property line without a corresponding mapping "
+            "in /proc/{pid}/%s",
+            MapsKind::SMaps));
+        return;
+      }
+    } else {
+      // Must be a new region header
+      if (region) {
+        // Save current region
+        callback(*region);
+        region.reset();
+      }
+
+      // Try to start a new region
+      llvm::Expected<MemoryRegionInfo> new_region =
+          ParseMemoryRegionInfoFromProcMapsLine(line, MapsKind::SMaps);
+      if (new_region) {
+        region = *new_region;
+      } else {
+        // Stop at first invalid region header
+        callback(new_region.takeError());
+        return;
+      }
+    }
+  }
+
+  // Catch last region
+  if (region)
+    callback(*region);
+}