Index: include/clang/Basic/Sanitizers.def
===================================================================
--- include/clang/Basic/Sanitizers.def
+++ include/clang/Basic/Sanitizers.def
@@ -44,6 +44,8 @@
 // Kernel AddressSanitizer (KASan)
 SANITIZER("kernel-address", KernelAddress)
 
+SANITIZER("hwaddress", HWAddress)
+
 // MemorySanitizer
 SANITIZER("memory", Memory)
 
Index: include/clang/Driver/SanitizerArgs.h
===================================================================
--- include/clang/Driver/SanitizerArgs.h
+++ include/clang/Driver/SanitizerArgs.h
@@ -55,12 +55,14 @@
   bool needsSharedRt() const { return SharedRuntime; }
 
   bool needsAsanRt() const { return Sanitizers.has(SanitizerKind::Address); }
+  bool needsHwasanRt() const { return Sanitizers.has(SanitizerKind::HWAddress); }
   bool needsTsanRt() const { return Sanitizers.has(SanitizerKind::Thread); }
   bool needsMsanRt() const { return Sanitizers.has(SanitizerKind::Memory); }
   bool needsFuzzer() const { return Sanitizers.has(SanitizerKind::Fuzzer); }
   bool needsLsanRt() const {
     return Sanitizers.has(SanitizerKind::Leak) &&
-           !Sanitizers.has(SanitizerKind::Address);
+           !Sanitizers.has(SanitizerKind::Address) &&
+           !Sanitizers.has(SanitizerKind::HWAddress);
   }
   bool needsUbsanRt() const;
   bool requiresMinimalRuntime() const { return MinimalRuntime; }
Index: lib/CodeGen/BackendUtil.cpp
===================================================================
--- lib/CodeGen/BackendUtil.cpp
+++ lib/CodeGen/BackendUtil.cpp
@@ -237,6 +237,11 @@
                                           /*Recover*/true));
 }
 
+static void addHWAddressSanitizerPasses(const PassManagerBuilder &Builder,
+                                            legacy::PassManagerBase &PM) {
+  PM.add(createHWAddressSanitizerPass());
+}
+
 static void addMemorySanitizerPass(const PassManagerBuilder &Builder,
                                    legacy::PassManagerBase &PM) {
   const PassManagerBuilderWrapper &BuilderWrapper =
@@ -556,6 +561,13 @@
                            addKernelAddressSanitizerPasses);
   }
 
+  if (LangOpts.Sanitize.has(SanitizerKind::HWAddress)) {
+    PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
+                           addHWAddressSanitizerPasses);
+    PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
+                           addHWAddressSanitizerPasses);
+  }
+
   if (LangOpts.Sanitize.has(SanitizerKind::Memory)) {
     PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
                            addMemorySanitizerPass);
Index: lib/CodeGen/CGDeclCXX.cpp
===================================================================
--- lib/CodeGen/CGDeclCXX.cpp
+++ lib/CodeGen/CGDeclCXX.cpp
@@ -324,6 +324,10 @@
       !isInSanitizerBlacklist(SanitizerKind::KernelAddress, Fn, Loc))
     Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
 
+  if (getLangOpts().Sanitize.has(SanitizerKind::HWAddress) &&
+      !isInSanitizerBlacklist(SanitizerKind::HWAddress, Fn, Loc))
+    Fn->addFnAttr(llvm::Attribute::SanitizeHWAddress);
+
   if (getLangOpts().Sanitize.has(SanitizerKind::Thread) &&
       !isInSanitizerBlacklist(SanitizerKind::Thread, Fn, Loc))
     Fn->addFnAttr(llvm::Attribute::SanitizeThread);
Index: lib/CodeGen/CodeGenFunction.cpp
===================================================================
--- lib/CodeGen/CodeGenFunction.cpp
+++ lib/CodeGen/CodeGenFunction.cpp
@@ -846,6 +846,8 @@
   // Apply sanitizer attributes to the function.
   if (SanOpts.hasOneOf(SanitizerKind::Address | SanitizerKind::KernelAddress))
     Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
+  if (SanOpts.hasOneOf(SanitizerKind::HWAddress))
+    Fn->addFnAttr(llvm::Attribute::SanitizeHWAddress);
   if (SanOpts.has(SanitizerKind::Thread))
     Fn->addFnAttr(llvm::Attribute::SanitizeThread);
   if (SanOpts.has(SanitizerKind::Memory))
Index: lib/CodeGen/CodeGenModule.cpp
===================================================================
--- lib/CodeGen/CodeGenModule.cpp
+++ lib/CodeGen/CodeGenModule.cpp
@@ -1582,7 +1582,7 @@
                                            StringRef Category) const {
   // For now globals can be blacklisted only in ASan and KASan.
   const SanitizerMask EnabledAsanMask = LangOpts.Sanitize.Mask &
-      (SanitizerKind::Address | SanitizerKind::KernelAddress);
+      (SanitizerKind::Address | SanitizerKind::KernelAddress | SanitizerKind::HWAddress);
   if (!EnabledAsanMask)
     return false;
   const auto &SanitizerBL = getContext().getSanitizerBlacklist();
Index: lib/CodeGen/SanitizerMetadata.cpp
===================================================================
--- lib/CodeGen/SanitizerMetadata.cpp
+++ lib/CodeGen/SanitizerMetadata.cpp
@@ -26,7 +26,8 @@
                                            QualType Ty, bool IsDynInit,
                                            bool IsBlacklisted) {
   if (!CGM.getLangOpts().Sanitize.hasOneOf(SanitizerKind::Address |
-                                           SanitizerKind::KernelAddress))
+                                           SanitizerKind::KernelAddress |
+                                           SanitizerKind::HWAddress))
     return;
   IsDynInit &= !CGM.isInSanitizerBlacklist(GV, Loc, Ty, "init");
   IsBlacklisted |= CGM.isInSanitizerBlacklist(GV, Loc, Ty);
@@ -58,7 +59,8 @@
 void SanitizerMetadata::reportGlobalToASan(llvm::GlobalVariable *GV,
                                            const VarDecl &D, bool IsDynInit) {
   if (!CGM.getLangOpts().Sanitize.hasOneOf(SanitizerKind::Address |
-                                           SanitizerKind::KernelAddress))
+                                           SanitizerKind::KernelAddress |
+                                           SanitizerKind::HWAddress))
     return;
   std::string QualName;
   llvm::raw_string_ostream OS(QualName);
@@ -76,7 +78,8 @@
   // For now, just make sure the global is not modified by the ASan
   // instrumentation.
   if (CGM.getLangOpts().Sanitize.hasOneOf(SanitizerKind::Address |
-                                          SanitizerKind::KernelAddress))
+                                          SanitizerKind::KernelAddress |
+                                          SanitizerKind::HWAddress))
     reportGlobalToASan(GV, SourceLocation(), "", QualType(), false, true);
 }
 
Index: lib/Driver/SanitizerArgs.cpp
===================================================================
--- lib/Driver/SanitizerArgs.cpp
+++ lib/Driver/SanitizerArgs.cpp
@@ -31,9 +31,10 @@
   NotAllowedWithTrap = Vptr,
   NotAllowedWithMinimalRuntime = Vptr,
   RequiresPIE = DataFlow | Scudo,
-  NeedsUnwindTables = Address | Thread | Memory | DataFlow,
-  SupportsCoverage = Address | KernelAddress | Memory | Leak | Undefined |
-                     Integer | Nullability | DataFlow | Fuzzer | FuzzerNoLink,
+  NeedsUnwindTables = Address | HWAddress | Thread | Memory | DataFlow,
+  SupportsCoverage = Address | HWAddress | KernelAddress | Memory | Leak |
+                     Undefined | Integer | Nullability | DataFlow | Fuzzer |
+                     FuzzerNoLink,
   RecoverableByDefault = Undefined | Integer | Nullability,
   Unrecoverable = Unreachable | Return,
   LegacyFsanitizeRecoverMask = Undefined | Integer,
@@ -96,6 +97,8 @@
   const char *BlacklistFile = nullptr;
   if (Kinds & Address)
     BlacklistFile = "asan_blacklist.txt";
+  else if (Kinds & HWAddress)
+    BlacklistFile = "hwasan_blacklist.txt";
   else if (Kinds & Memory)
     BlacklistFile = "msan_blacklist.txt";
   else if (Kinds & Thread)
@@ -172,8 +175,8 @@
 
 bool SanitizerArgs::needsUbsanRt() const {
   // All of these include ubsan.
-  if (needsAsanRt() || needsMsanRt() || needsTsanRt() || needsDfsanRt() ||
-      needsLsanRt() || needsCfiDiagRt() || needsScudoRt())
+  if (needsAsanRt() || needsMsanRt() || needsHwasanRt() || needsTsanRt() ||
+      needsDfsanRt() || needsLsanRt() || needsCfiDiagRt() || needsScudoRt())
     return false;
 
   return (Sanitizers.Mask & NeedsUbsanRt & ~TrapSanitizers.Mask) ||
@@ -373,11 +376,12 @@
       std::make_pair(Address, Thread | Memory),
       std::make_pair(Thread, Memory),
       std::make_pair(Leak, Thread | Memory),
-      std::make_pair(KernelAddress, Address| Leak | Thread | Memory),
-      std::make_pair(Efficiency, Address | Leak | Thread | Memory |
-                                 KernelAddress),
-      std::make_pair(Scudo, Address | Leak | Thread | Memory | KernelAddress |
-                            Efficiency) };
+      std::make_pair(KernelAddress, Address | Leak | Thread | Memory),
+      std::make_pair(HWAddress, Address | Thread | Memory | KernelAddress),
+      std::make_pair(Efficiency, Address | HWAddress | Leak | Thread | Memory |
+                                     KernelAddress),
+      std::make_pair(Scudo, Address | HWAddress | Leak | Thread | Memory |
+                                KernelAddress | Efficiency)};
   for (auto G : IncompatibleGroups) {
     SanitizerMask Group = G.first;
     if (Kinds & Group) {
Index: lib/Driver/ToolChains/CommonArgs.cpp
===================================================================
--- lib/Driver/ToolChains/CommonArgs.cpp
+++ lib/Driver/ToolChains/CommonArgs.cpp
@@ -575,6 +575,8 @@
     }
     if (SanArgs.needsScudoRt())
       SharedRuntimes.push_back("scudo");
+    if (SanArgs.needsHwasanRt())
+      SharedRuntimes.push_back("hwasan");
   }
 
   // The stats_client library is also statically linked into DSOs.
@@ -591,6 +593,12 @@
     if (SanArgs.linkCXXRuntimes())
       StaticRuntimes.push_back("asan_cxx");
   }
+
+  if (SanArgs.needsHwasanRt()) {
+    StaticRuntimes.push_back("hwasan");
+    if (SanArgs.linkCXXRuntimes())
+      StaticRuntimes.push_back("hwasan_cxx");
+  }
   if (SanArgs.needsDfsanRt())
     StaticRuntimes.push_back("dfsan");
   if (SanArgs.needsLsanRt())
Index: lib/Driver/ToolChains/Linux.cpp
===================================================================
--- lib/Driver/ToolChains/Linux.cpp
+++ lib/Driver/ToolChains/Linux.cpp
@@ -854,6 +854,8 @@
     Res |= SanitizerKind::Function;
   if (IsX86_64 || IsMIPS64 || IsAArch64 || IsX86 || IsArmArch)
     Res |= SanitizerKind::Scudo;
+  if (IsAArch64)
+    Res |= SanitizerKind::HWAddress;
   return Res;
 }
 
Index: lib/Lex/PPMacroExpansion.cpp
===================================================================
--- lib/Lex/PPMacroExpansion.cpp
+++ lib/Lex/PPMacroExpansion.cpp
@@ -1099,6 +1099,8 @@
       .Case("address_sanitizer",
             LangOpts.Sanitize.hasOneOf(SanitizerKind::Address |
                                        SanitizerKind::KernelAddress))
+      .Case("hwaddress_sanitizer",
+            LangOpts.Sanitize.hasOneOf(SanitizerKind::HWAddress))
       .Case("assume_nonnull", true)
       .Case("attribute_analyzer_noreturn", true)
       .Case("attribute_availability", true)
@@ -1136,7 +1138,8 @@
       .Case("nullability_on_arrays", true)
       .Case("memory_sanitizer", LangOpts.Sanitize.has(SanitizerKind::Memory))
       .Case("thread_sanitizer", LangOpts.Sanitize.has(SanitizerKind::Thread))
-      .Case("dataflow_sanitizer", LangOpts.Sanitize.has(SanitizerKind::DataFlow))
+      .Case("dataflow_sanitizer",
+            LangOpts.Sanitize.has(SanitizerKind::DataFlow))
       .Case("efficiency_sanitizer",
             LangOpts.Sanitize.hasOneOf(SanitizerKind::Efficiency))
       .Case("scudo", LangOpts.Sanitize.hasOneOf(SanitizerKind::Scudo))
Index: test/CodeGen/address-safety-attr-kasan-hwasan.cpp
===================================================================
--- test/CodeGen/address-safety-attr-kasan-hwasan.cpp
+++ test/CodeGen/address-safety-attr-kasan-hwasan.cpp
@@ -0,0 +1,53 @@
+// Make sure the sanitize_address attribute is emitted when using both ASan and KASan.
+// Also document that __attribute__((no_sanitize_address)) doesn't disable KASan instrumentation.
+
+/// RUN: %clang_cc1 -triple i386-unknown-linux -disable-O0-optnone -emit-llvm -o - %s | FileCheck -check-prefix=CHECK-NOASAN %s
+/// RUN: %clang_cc1 -triple i386-unknown-linux -fsanitize=address -disable-O0-optnone -emit-llvm -o - %s | FileCheck -check-prefix=CHECK-ASAN %s
+/// RUN: %clang_cc1 -triple i386-unknown-linux -fsanitize=kernel-address -disable-O0-optnone -emit-llvm -o - %s | FileCheck -check-prefix=CHECK-KASAN %s
+/// RUN: %clang_cc1 -triple i386-unknown-linux -fsanitize=hwaddress -disable-O0-optnone -emit-llvm -o - %s | FileCheck -check-prefix=CHECK-HWASAN %s
+
+int HasSanitizeAddress() {
+  return 1;
+}
+// CHECK-NOASAN: {{Function Attrs: noinline nounwind$}}
+// CHECK-ASAN: Function Attrs: noinline nounwind sanitize_address
+// CHECK-KASAN: Function Attrs: noinline nounwind sanitize_address
+// CHECK-HWASAN: Function Attrs: noinline nounwind sanitize_hwaddress
+
+__attribute__((no_sanitize("address")))
+int NoSanitizeQuoteAddress() {
+  return 0;
+}
+// CHECK-NOASAN: {{Function Attrs: noinline nounwind$}}
+// CHECK-ASAN: {{Function Attrs: noinline nounwind$}}
+// CHECK-KASAN: {{Function Attrs: noinline nounwind sanitize_address$}}
+// CHECK-HWASAN: {{Function Attrs: noinline nounwind sanitize_hwaddress$}}
+
+__attribute__((no_sanitize_address))
+int NoSanitizeAddress() {
+  return 0;
+}
+// CHECK-NOASAN: {{Function Attrs: noinline nounwind$}}
+// CHECK-ASAN: {{Function Attrs: noinline nounwind$}}
+// CHECK-KASAN: {{Function Attrs: noinline nounwind sanitize_address$}}
+// CHECK-HWASAN: {{Function Attrs: noinline nounwind sanitize_hwaddress$}}
+
+__attribute__((no_sanitize("kernel-address")))
+int NoSanitizeKernelAddress() {
+  return 0;
+}
+
+// CHECK-NOASAN: {{Function Attrs: noinline nounwind$}}
+// CHECK-ASAN: {{Function Attrs: noinline nounwind sanitize_address$}}
+// CHECK-KASAN: {{Function Attrs: noinline nounwind$}}
+// CHECK-HWASAN: {{Function Attrs: noinline nounwind sanitize_hwaddress$}}
+
+__attribute__((no_sanitize("hwaddress")))
+int NoSanitizeHWAddress() {
+  return 0;
+}
+
+// CHECK-NOASAN: {{Function Attrs: noinline nounwind$}}
+// CHECK-ASAN: {{Function Attrs: noinline nounwind sanitize_address$}}
+// CHECK-KASAN: {{Function Attrs: noinline nounwind sanitize_address$}}
+// CHECK-HWASAN: {{Function Attrs: noinline nounwind$}}
Index: test/Driver/asan.c
===================================================================
--- test/Driver/asan.c
+++ test/Driver/asan.c
@@ -6,8 +6,13 @@
 // RUN: %clang -O1 -target i386-unknown-linux -fsanitize=kernel-address %s -S -emit-llvm -o - | FileCheck %s --check-prefix=CHECK-KASAN
 // RUN: %clang -O2 -target i386-unknown-linux -fsanitize=kernel-address %s -S -emit-llvm -o - | FileCheck %s --check-prefix=CHECK-KASAN
 // RUN: %clang -O3 -target i386-unknown-linux -fsanitize=kernel-address %s -S -emit-llvm -o - | FileCheck %s --check-prefix=CHECK-KASAN
+// RUN: %clang     -target aarch64-unknown-linux -fsanitize=hwaddress %s -S -emit-llvm -o - | FileCheck %s --check-prefix=CHECK-HWASAN
+// RUN: %clang -O1 -target aarch64-unknown-linux -fsanitize=hwaddress %s -S -emit-llvm -o - | FileCheck %s --check-prefix=CHECK-HWASAN
+// RUN: %clang -O2 -target aarch64-unknown-linux -fsanitize=hwaddress %s -S -emit-llvm -o - | FileCheck %s --check-prefix=CHECK-HWASAN
+// RUN: %clang -O3 -target aarch64-unknown-linux -fsanitize=hwaddress %s -S -emit-llvm -o - | FileCheck %s --check-prefix=CHECK-HWASAN
 // Verify that -fsanitize={address,kernel-address} invoke ASan and KASan instrumentation.
 
 int foo(int *a) { return *a; }
 // CHECK-ASAN: __asan_init
 // CHECK-KASAN: __asan_load4_noabort
+// CHECK-HWASAN: __hwasan_init
Index: test/Driver/fsanitize-blacklist.c
===================================================================
--- test/Driver/fsanitize-blacklist.c
+++ test/Driver/fsanitize-blacklist.c
@@ -13,6 +13,7 @@
 // RUN: echo "badline" > %t.bad
 
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=address -fsanitize-blacklist=%t.good -fsanitize-blacklist=%t.second %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-BLACKLIST
+// RUN: %clang -target aarch64-linux-gnu -fsanitize=hwaddress -fsanitize-blacklist=%t.good -fsanitize-blacklist=%t.second %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-BLACKLIST
 // CHECK-BLACKLIST: -fsanitize-blacklist={{.*}}.good" "-fsanitize-blacklist={{.*}}.second
 
 // Now, check for -fdepfile-entry flags.
@@ -20,8 +21,10 @@
 // CHECK-BLACKLIST2: -fdepfile-entry={{.*}}.good" "-fdepfile-entry={{.*}}.second
 
 // Check that the default blacklist is not added as an extra dependency.
-// RUN: %clang -target x86_64-linux-gnu -fsanitize=address -resource-dir=%S/Inputs/resource_dir %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-DEFAULT-BLACKLIST --implicit-check-not=fdepfile-entry
-// CHECK-DEFAULT-BLACKLIST: -fsanitize-blacklist={{.*}}asan_blacklist.txt
+// RUN: %clang -target x86_64-linux-gnu -fsanitize=address -resource-dir=%S/Inputs/resource_dir %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-DEFAULT-BLACKLIST-ASAN --implicit-check-not=fdepfile-entry
+// CHECK-DEFAULT-BLACKLIST-ASAN: -fsanitize-blacklist={{.*}}/asan_blacklist.txt
+// RUN: %clang -target aarch64-linux-gnu -fsanitize=hwaddress -resource-dir=%S/Inputs/resource_dir %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-DEFAULT-BLACKLIST-HWASAN --implicit-check-not=fdepfile-entry
+// CHECK-DEFAULT-BLACKLIST-HWASAN: -fsanitize-blacklist={{.*}}/hwasan_blacklist.txt
 
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=integer -resource-dir=%S/Inputs/resource_dir %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-DEFAULT-UBSAN-BLACKLIST --implicit-check-not=fdepfile-entry
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=nullability -resource-dir=%S/Inputs/resource_dir %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-DEFAULT-UBSAN-BLACKLIST --implicit-check-not=fdepfile-entry
Index: test/Driver/fsanitize-coverage.c
===================================================================
--- test/Driver/fsanitize-coverage.c
+++ test/Driver/fsanitize-coverage.c
@@ -6,6 +6,7 @@
 
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=address -fsanitize-coverage=func,trace-pc %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANITIZE-COVERAGE-FUNC
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=kernel-address -fsanitize-coverage=func,trace-pc %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANITIZE-COVERAGE-FUNC
+// RUN: %clang -target x86_64-linux-gnu -fsanitize=hwaddress -fsanitize-coverage=func,trace-pc %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANITIZE-COVERAGE-FUNC
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=memory -fsanitize-coverage=func,trace-pc %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANITIZE-COVERAGE-FUNC
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=leak -fsanitize-coverage=func,trace-pc %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANITIZE-COVERAGE-FUNC
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=undefined -fsanitize-coverage=func,trace-pc %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANITIZE-COVERAGE-FUNC
Index: test/Driver/fsanitize.c
===================================================================
--- test/Driver/fsanitize.c
+++ test/Driver/fsanitize.c
@@ -85,6 +85,15 @@
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=kernel-address,address -fno-rtti %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANKA-SANA
 // CHECK-SANKA-SANA: '-fsanitize=kernel-address' not allowed with '-fsanitize=address'
 
+// RUN: %clang -target aarch64-linux-gnu -fsanitize=hwaddress,thread -fno-rtti %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANHA-SANT
+// CHECK-SANHA-SANT: '-fsanitize=hwaddress' not allowed with '-fsanitize=thread'
+
+// RUN: %clang -target aarch64-linux-gnu -fsanitize=hwaddress,memory -pie -fno-rtti %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANHA-SANM
+// CHECK-SANHA-SANM: '-fsanitize=hwaddress' not allowed with '-fsanitize=memory'
+
+// RUN: %clang -target aarch64-linux-gnu -fsanitize=hwaddress,address -fno-rtti %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANHA-SANA
+// CHECK-SANHA-SANA: '-fsanitize=hwaddress' not allowed with '-fsanitize=address'
+
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=kernel-address,leak -pie -fno-rtti %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANKA-SANL
 // CHECK-SANKA-SANL: '-fsanitize=kernel-address' not allowed with '-fsanitize=leak'
 
@@ -464,6 +473,9 @@
 // RUN: %clang -target x86_64-linux-gnu -fsanitize-trap=address -c %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-ASAN-TRAP
 // CHECK-ASAN-TRAP: error: unsupported argument 'address' to option '-fsanitize-trap'
 
+// RUN: %clang -target aarch64-linux-gnu -fsanitize-trap=hwaddress -c %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-HWASAN-TRAP
+// CHECK-HWASAN-TRAP: error: unsupported argument 'hwaddress' to option '-fsanitize-trap'
+
 // RUN: %clang -target x86_64-apple-darwin10 -mmacosx-version-min=10.7 -flto -fsanitize=cfi-vcall -fno-sanitize-trap=cfi -c %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-CFI-NOTRAP-OLD-MACOS
 // CHECK-CFI-NOTRAP-OLD-MACOS: error: unsupported option '-fno-sanitize-trap=cfi-vcall' for target 'x86_64-apple-darwin10'
 
@@ -595,6 +607,8 @@
 
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=address -fsanitize-minimal-runtime -fsanitize=undefined %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-ASAN-UBSAN-MINIMAL
 // CHECK-ASAN-UBSAN-MINIMAL: error: invalid argument '-fsanitize-minimal-runtime' not allowed with '-fsanitize=address'
+// RUN: %clang -target aarch64-linux-gnu -fsanitize=hwaddress -fsanitize-minimal-runtime %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-HWASAN-MINIMAL
+// CHECK-HWASAN-MINIMAL: error: invalid argument '-fsanitize-minimal-runtime' not allowed with '-fsanitize=hwaddress'
 
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=cfi -flto -fvisibility=hidden -fsanitize-minimal-runtime %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-CFI-MINIMAL
 // CHECK-CFI-MINIMAL: "-fsanitize=cfi-derived-cast,cfi-icall,cfi-unrelated-cast,cfi-nvcall,cfi-vcall"
@@ -634,3 +648,8 @@
 // CHECK-SCUDO-MSAN: error: invalid argument '-fsanitize=scudo' not allowed with '-fsanitize=memory'
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=scudo,thread  %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SCUDO-TSAN
 // CHECK-SCUDO-TSAN: error: invalid argument '-fsanitize=scudo' not allowed with '-fsanitize=thread'
+// RUN: %clang -target aarch64-linux-gnu -fsanitize=scudo,hwaddress  %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SCUDO-HWASAN
+// CHECK-SCUDO-HWASAN: error: invalid argument '-fsanitize=scudo' not allowed with '-fsanitize=hwaddress'
+
+// RUN: %clang -target x86_64-linux-gnu -fsanitize=hwaddress %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANHA-X86_64
+// CHECK-SANHA-X86_64: unsupported option '-fsanitize=hwaddress' for target
Index: test/Driver/sanitize_unwind_tables.c
===================================================================
--- test/Driver/sanitize_unwind_tables.c
+++ test/Driver/sanitize_unwind_tables.c
@@ -9,5 +9,7 @@
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=dataflow %s -### 2>&1 |  FileCheck %s
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=efficiency-cache-frag %s -### 2>&1 |  FileCheck %s
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=efficiency-working-set %s -### 2>&1 |  FileCheck %s
+// RUN: %clang -target aarch64-linux-gnu -fsanitize=hwaddress %s -### 2>&1 |  FileCheck %s
+// RUN: %clang -target aarch64-linux-android -fsanitize=hwaddress %s -### 2>&1 |  FileCheck %s
 
 // CHECK: -munwind-tables
Index: test/Driver/sanitizer-ld.c
===================================================================
--- test/Driver/sanitizer-ld.c
+++ test/Driver/sanitizer-ld.c
@@ -694,3 +694,56 @@
 // CHECK-SCUDO-ANDROID-STATIC: "-whole-archive" "{{.*}}libclang_rt.scudo-arm-android.a" "-no-whole-archive"
 // CHECK-SCUDO-ANDROID-STATIC-NOT: "-lstdc++"
 // CHECK-SCUDO-ANDROID-STATIC: "-lpthread"
+
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     -target aarch64-unknown-linux -fuse-ld=ld -fsanitize=hwaddress \
+// RUN:     -resource-dir=%S/Inputs/resource_dir \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-HWASAN-LINUX %s
+//
+// CHECK-HWASAN-LINUX: "{{(.*[^-.0-9A-Z_a-z])?}}ld{{(.exe)?}}"
+// CHECK-HWASAN-LINUX-NOT: "-lc"
+// CHECK-HWASAN-LINUX: libclang_rt.hwasan-aarch64.a"
+// CHECK-HWASAN-LINUX-NOT: "-export-dynamic"
+// CHECK-HWASAN-LINUX: "--dynamic-list={{.*}}libclang_rt.hwasan-aarch64.a.syms"
+// CHECK-HWASAN-LINUX-NOT: "-export-dynamic"
+// CHECK-HWASAN-LINUX: "-lpthread"
+// CHECK-HWASAN-LINUX: "-lrt"
+// CHECK-HWASAN-LINUX: "-ldl"
+
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     -target aarch64-unknown-linux -fuse-ld=ld -fsanitize=hwaddress -shared-libsan \
+// RUN:     -resource-dir=%S/Inputs/resource_dir \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-SHARED-HWASAN-LINUX %s
+
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     -target aarch64-unknown-linux -fuse-ld=ld -fsanitize=hwaddress \
+// RUN:     -shared-libsan \
+// RUN:     -resource-dir=%S/Inputs/resource_dir \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-SHARED-HWASAN-LINUX %s
+//
+// CHECK-SHARED-HWASAN-LINUX: "{{(.*[^-.0-9A-Z_a-z])?}}ld{{(.exe)?}}"
+// CHECK-SHARED-HWASAN-LINUX-NOT: "-lc"
+// CHECK-SHARED-HWASAN-LINUX: libclang_rt.hwasan-aarch64.so"
+// CHECK-SHARED-HWASAN-LINUX-NOT: "-lpthread"
+// CHECK-SHARED-HWASAN-LINUX-NOT: "-lrt"
+// CHECK-SHARED-HWASAN-LINUX-NOT: "-ldl"
+// CHECK-SHARED-HWASAN-LINUX-NOT: "-export-dynamic"
+// CHECK-SHARED-HWASAN-LINUX-NOT: "--dynamic-list"
+
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.so -shared 2>&1 \
+// RUN:     -target aarch64-unknown-linux -fuse-ld=ld -fsanitize=hwaddress -shared-libsan \
+// RUN:     -resource-dir=%S/Inputs/resource_dir \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-DSO-SHARED-HWASAN-LINUX %s
+//
+// CHECK-DSO-SHARED-HWASAN-LINUX: "{{(.*[^-.0-9A-Z_a-z])?}}ld{{(.exe)?}}"
+// CHECK-DSO-SHARED-HWASAN-LINUX-NOT: "-lc"
+// CHECK-DSO-SHARED-HWASAN-LINUX: libclang_rt.hwasan-aarch64.so"
+// CHECK-DSO-SHARED-HWASAN-LINUX-NOT: "-lpthread"
+// CHECK-DSO-SHARED-HWASAN-LINUX-NOT: "-lrt"
+// CHECK-DSO-SHARED-HWASAN-LINUX-NOT: "-ldl"
+// CHECK-DSO-SHARED-HWASAN-LINUX-NOT: "-export-dynamic"
+// CHECK-DSO-SHARED-HWASAN-LINUX-NOT: "--dynamic-list"
Index: test/Lexer/has_feature_address_sanitizer.cpp
===================================================================
--- test/Lexer/has_feature_address_sanitizer.cpp
+++ test/Lexer/has_feature_address_sanitizer.cpp
@@ -1,5 +1,6 @@
 // RUN: %clang_cc1 -E -fsanitize=address %s -o - | FileCheck --check-prefix=CHECK-ASAN %s
 // RUN: %clang_cc1 -E -fsanitize=kernel-address %s -o - | FileCheck --check-prefix=CHECK-ASAN %s
+// RUN: %clang_cc1 -E -fsanitize=hwaddress %s -o - | FileCheck --check-prefix=CHECK-HWASAN %s
 // RUN: %clang_cc1 -E  %s -o - | FileCheck --check-prefix=CHECK-NO-ASAN %s
 
 #if __has_feature(address_sanitizer)
@@ -8,5 +9,17 @@
 int AddressSanitizerDisabled();
 #endif
 
+#if __has_feature(hwaddress_sanitizer)
+int HWAddressSanitizerEnabled();
+#else
+int HWAddressSanitizerDisabled();
+#endif
+
 // CHECK-ASAN: AddressSanitizerEnabled
+// CHECK-ASAN: HWAddressSanitizerDisabled
+
+// CHECK-HWASAN: AddressSanitizerDisabled
+// CHECK-HWASAN: HWAddressSanitizerEnabled
+
 // CHECK-NO-ASAN: AddressSanitizerDisabled
+// CHECK-NO-ASAN: HWAddressSanitizerDisabled
Index: test/SemaCXX/attr-no-sanitize.cpp
===================================================================
--- test/SemaCXX/attr-no-sanitize.cpp
+++ test/SemaCXX/attr-no-sanitize.cpp
@@ -16,10 +16,15 @@
 // PRINT: int f4() {{\[\[}}clang::no_sanitize("thread")]]
 [[clang::no_sanitize("thread")]] int f4();
 
+// DUMP-LABEL: FunctionDecl {{.*}} f4
+// DUMP: NoSanitizeAttr {{.*}} hwaddress
+// PRINT: int f4() {{\[\[}}clang::no_sanitize("hwaddress")]]
+[[clang::no_sanitize("hwaddress")]] int f4();
+
 // DUMP-LABEL: FunctionDecl {{.*}} f5
-// DUMP: NoSanitizeAttr {{.*}} address thread
-// PRINT: int f5() __attribute__((no_sanitize("address", "thread")))
-int f5() __attribute__((no_sanitize("address", "thread")));
+// DUMP: NoSanitizeAttr {{.*}} address thread hwaddress
+// PRINT: int f5() __attribute__((no_sanitize("address", "thread", "hwaddress")))
+int f5() __attribute__((no_sanitize("address", "thread", "hwaddress")));
 
 // DUMP-LABEL: FunctionDecl {{.*}} f6
 // DUMP: NoSanitizeAttr {{.*}} unknown