diff --git a/compiler/Android.mk b/compiler/Android.mk
index edc5bd0..f413576 100644
--- a/compiler/Android.mk
+++ b/compiler/Android.mk
@@ -223,6 +223,7 @@
   else # host
     LOCAL_CLANG := $(ART_HOST_CLANG)
     LOCAL_CFLAGS += $(ART_HOST_CFLAGS)
+    LOCAL_LDLIBS := $(ART_HOST_LDLIBS)
     ifeq ($$(art_ndebug_or_debug),debug)
       LOCAL_CFLAGS += $(ART_HOST_DEBUG_CFLAGS)
     else
diff --git a/compiler/common_compiler_test.cc b/compiler/common_compiler_test.cc
index d1d47fb..9a5f74d 100644
--- a/compiler/common_compiler_test.cc
+++ b/compiler/common_compiler_test.cc
@@ -16,18 +16,12 @@
 
 #include "common_compiler_test.h"
 
-#if defined(__arm__)
-#include <sys/ucontext.h>
-#endif
-#include <fstream>
-
 #include "class_linker.h"
 #include "compiled_method.h"
 #include "dex/quick_compiler_callbacks.h"
 #include "dex/verification_results.h"
 #include "dex/quick/dex_file_to_method_inliner_map.h"
 #include "driver/compiler_driver.h"
-#include "entrypoints/entrypoint_utils.h"
 #include "interpreter/interpreter.h"
 #include "mirror/art_method.h"
 #include "mirror/dex_cache.h"
@@ -38,128 +32,9 @@
 
 namespace art {
 
-// Normally the ClassLinker supplies this.
-extern "C" void art_quick_generic_jni_trampoline(mirror::ArtMethod*);
-
-#if defined(__arm__)
-// A signal handler called when have an illegal instruction.  We record the fact in
-// a global boolean and then increment the PC in the signal context to return to
-// the next instruction.  We know the instruction is an sdiv (4 bytes long).
-static void baddivideinst(int signo, siginfo *si, void *data) {
-  UNUSED(signo);
-  UNUSED(si);
-  struct ucontext *uc = (struct ucontext *)data;
-  struct sigcontext *sc = &uc->uc_mcontext;
-  sc->arm_r0 = 0;     // set R0 to #0 to signal error
-  sc->arm_pc += 4;    // skip offending instruction
-}
-
-// This is in arch/arm/arm_sdiv.S.  It does the following:
-// mov r1,#1
-// sdiv r0,r1,r1
-// bx lr
-//
-// the result will be the value 1 if sdiv is supported.  If it is not supported
-// a SIGILL signal will be raised and the signal handler (baddivideinst) called.
-// The signal handler sets r0 to #0 and then increments pc beyond the failed instruction.
-// Thus if the instruction is not supported, the result of this function will be #0
-
-extern "C" bool CheckForARMSDIVInstruction();
-
-static InstructionSetFeatures GuessInstructionFeatures() {
-  InstructionSetFeatures f;
-
-  // Uncomment this for processing of /proc/cpuinfo.
-  if (false) {
-    // Look in /proc/cpuinfo for features we need.  Only use this when we can guarantee that
-    // the kernel puts the appropriate feature flags in here.  Sometimes it doesn't.
-    std::ifstream in("/proc/cpuinfo");
-    if (in) {
-      while (!in.eof()) {
-        std::string line;
-        std::getline(in, line);
-        if (!in.eof()) {
-          if (line.find("Features") != std::string::npos) {
-            if (line.find("idivt") != std::string::npos) {
-              f.SetHasDivideInstruction(true);
-            }
-          }
-        }
-        in.close();
-      }
-    } else {
-      LOG(INFO) << "Failed to open /proc/cpuinfo";
-    }
-  }
-
-  // See if have a sdiv instruction.  Register a signal handler and try to execute
-  // an sdiv instruction.  If we get a SIGILL then it's not supported.  We can't use
-  // the /proc/cpuinfo method for this because Krait devices don't always put the idivt
-  // feature in the list.
-  struct sigaction sa, osa;
-  sa.sa_flags = SA_ONSTACK | SA_RESTART | SA_SIGINFO;
-  sa.sa_sigaction = baddivideinst;
-  sigaction(SIGILL, &sa, &osa);
-
-  if (CheckForARMSDIVInstruction()) {
-    f.SetHasDivideInstruction(true);
-  }
-
-  // Restore the signal handler.
-  sigaction(SIGILL, &osa, nullptr);
-
-  // Other feature guesses in here.
-  return f;
-}
-#endif
-
-// Given a set of instruction features from the build, parse it.  The
-// input 'str' is a comma separated list of feature names.  Parse it and
-// return the InstructionSetFeatures object.
-static InstructionSetFeatures ParseFeatureList(std::string str) {
-  InstructionSetFeatures result;
-  typedef std::vector<std::string> FeatureList;
-  FeatureList features;
-  Split(str, ',', features);
-  for (FeatureList::iterator i = features.begin(); i != features.end(); i++) {
-    std::string feature = Trim(*i);
-    if (feature == "default") {
-      // Nothing to do.
-    } else if (feature == "div") {
-      // Supports divide instruction.
-      result.SetHasDivideInstruction(true);
-    } else if (feature == "nodiv") {
-      // Turn off support for divide instruction.
-      result.SetHasDivideInstruction(false);
-    } else {
-      LOG(FATAL) << "Unknown instruction set feature: '" << feature << "'";
-    }
-  }
-  // Others...
-  return result;
-}
-
 CommonCompilerTest::CommonCompilerTest() {}
 CommonCompilerTest::~CommonCompilerTest() {}
 
-OatFile::OatMethod CommonCompilerTest::CreateOatMethod(const void* code, const uint8_t* gc_map) {
-  CHECK(code != nullptr);
-  const uint8_t* base;
-  uint32_t code_offset, gc_map_offset;
-  if (gc_map == nullptr) {
-    base = reinterpret_cast<const uint8_t*>(code);  // Base of data points at code.
-    base -= sizeof(void*);  // Move backward so that code_offset != 0.
-    code_offset = sizeof(void*);
-    gc_map_offset = 0;
-  } else {
-    // TODO: 64bit support.
-    base = nullptr;  // Base of data in oat file, ie 0.
-    code_offset = PointerToLowMemUInt32(code);
-    gc_map_offset = PointerToLowMemUInt32(gc_map);
-  }
-  return OatFile::OatMethod(base, code_offset, gc_map_offset);
-}
-
 void CommonCompilerTest::MakeExecutable(mirror::ArtMethod* method) {
   CHECK(method != nullptr);
 
@@ -174,7 +49,8 @@
   if (compiled_method != nullptr) {
     const std::vector<uint8_t>* code = compiled_method->GetQuickCode();
     const void* code_ptr;
-    if (code != nullptr) {
+    bool is_portable = (code == nullptr);
+    if (!is_portable) {
       uint32_t code_size = code->size();
       CHECK_NE(0u, code_size);
       const std::vector<uint8_t>& vmap_table = compiled_method->GetVmapTable();
@@ -210,33 +86,11 @@
     const void* method_code = CompiledMethod::CodePointer(code_ptr,
                                                           compiled_method->GetInstructionSet());
     LOG(INFO) << "MakeExecutable " << PrettyMethod(method) << " code=" << method_code;
-    OatFile::OatMethod oat_method = CreateOatMethod(method_code, nullptr);
-    oat_method.LinkMethod(method);
-    method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge);
+    class_linker_->SetEntryPointsToCompiledCode(method, method_code, is_portable);
   } else {
     // No code? You must mean to go into the interpreter.
     // Or the generic JNI...
-    if (!method->IsNative()) {
-      const void* method_code = kUsePortableCompiler ? GetPortableToInterpreterBridge()
-          : GetQuickToInterpreterBridge();
-      OatFile::OatMethod oat_method = CreateOatMethod(method_code, nullptr);
-      oat_method.LinkMethod(method);
-      method->SetEntryPointFromInterpreter(interpreter::artInterpreterToInterpreterBridge);
-    } else {
-      const void* method_code = reinterpret_cast<void*>(art_quick_generic_jni_trampoline);
-
-      OatFile::OatMethod oat_method = CreateOatMethod(method_code, nullptr);
-      oat_method.LinkMethod(method);
-      method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge);
-    }
-  }
-  // Create bridges to transition between different kinds of compiled bridge.
-  if (method->GetEntryPointFromPortableCompiledCode() == nullptr) {
-    method->SetEntryPointFromPortableCompiledCode(GetPortableToQuickBridge());
-  } else {
-    CHECK(method->GetEntryPointFromQuickCompiledCode() == nullptr);
-    method->SetEntryPointFromQuickCompiledCode(GetQuickToPortableBridge());
-    method->SetIsPortableCompiled();
+    class_linker_->SetEntryPointsToInterpreter(method);
   }
 }
 
@@ -282,19 +136,9 @@
   {
     ScopedObjectAccess soa(Thread::Current());
 
-    InstructionSet instruction_set = kRuntimeISA;
-
+    const InstructionSet instruction_set = kRuntimeISA;
     // Take the default set of instruction features from the build.
-    InstructionSetFeatures instruction_set_features =
-        ParseFeatureList(Runtime::GetDefaultInstructionSetFeatures());
-
-#if defined(__arm__)
-    InstructionSetFeatures runtime_features = GuessInstructionFeatures();
-
-    // for ARM, do a runtime check to make sure that the features we are passed from
-    // the build match the features we actually determine at runtime.
-    ASSERT_LE(instruction_set_features, runtime_features);
-#endif
+    instruction_set_features_.reset(InstructionSetFeatures::FromCppDefines());
 
     runtime_->SetInstructionSet(instruction_set);
     for (int i = 0; i < Runtime::kLastCalleeSaveType; i++) {
@@ -313,7 +157,7 @@
                                               verification_results_.get(),
                                               method_inliner_map_.get(),
                                               compiler_kind, instruction_set,
-                                              instruction_set_features,
+                                              instruction_set_features_.get(),
                                               true, new std::set<std::string>,
                                               2, true, true, timer_.get()));
   }
diff --git a/compiler/common_compiler_test.h b/compiler/common_compiler_test.h
index df06b71..20b750c 100644
--- a/compiler/common_compiler_test.h
+++ b/compiler/common_compiler_test.h
@@ -81,6 +81,8 @@
   std::unique_ptr<CompilerCallbacks> callbacks_;
   std::unique_ptr<CompilerDriver> compiler_driver_;
   std::unique_ptr<CumulativeLogger> timer_;
+  std::unique_ptr<const InstructionSetFeatures> instruction_set_features_;
+
 
  private:
   std::unique_ptr<MemMap> image_reservation_;
diff --git a/compiler/dex/compiler_ir.h b/compiler/dex/compiler_ir.h
index 37e3a7a..34585c1 100644
--- a/compiler/dex/compiler_ir.h
+++ b/compiler/dex/compiler_ir.h
@@ -68,7 +68,7 @@
   InstructionSet instruction_set;
   bool target64;
 
-  InstructionSetFeatures GetInstructionSetFeatures() {
+  const InstructionSetFeatures* GetInstructionSetFeatures() {
     return compiler_driver->GetInstructionSetFeatures();
   }
 
diff --git a/compiler/dex/quick/arm/utility_arm.cc b/compiler/dex/quick/arm/utility_arm.cc
index e833c9a..09acf4c 100644
--- a/compiler/dex/quick/arm/utility_arm.cc
+++ b/compiler/dex/quick/arm/utility_arm.cc
@@ -969,9 +969,9 @@
     size = k32;
   }
   LIR* load;
-  if (UNLIKELY(is_volatile == kVolatile &&
-               (size == k64 || size == kDouble) &&
-               !cu_->compiler_driver->GetInstructionSetFeatures().HasLpae())) {
+  if (is_volatile == kVolatile && (size == k64 || size == kDouble) &&
+      !cu_->compiler_driver->GetInstructionSetFeatures()->
+          AsArmInstructionSetFeatures()->HasLpae()) {
     // Only 64-bit load needs special handling.
     // If the cpu supports LPAE, aligned LDRD is atomic - fall through to LoadBaseDisp().
     DCHECK(!r_dest.IsFloat());  // See RegClassForFieldLoadSave().
@@ -1093,9 +1093,9 @@
   }
 
   LIR* store;
-  if (UNLIKELY(is_volatile == kVolatile &&
-               (size == k64 || size == kDouble) &&
-               !cu_->compiler_driver->GetInstructionSetFeatures().HasLpae())) {
+  if (is_volatile == kVolatile && (size == k64 || size == kDouble) &&
+      !cu_->compiler_driver->GetInstructionSetFeatures()->
+          AsArmInstructionSetFeatures()->HasLpae()) {
     // Only 64-bit store needs special handling.
     // If the cpu supports LPAE, aligned STRD is atomic - fall through to StoreBaseDisp().
     // Use STREXD for the atomic store. (Expect displacement > 0, don't optimize for == 0.)
diff --git a/compiler/dex/quick/gen_common.cc b/compiler/dex/quick/gen_common.cc
index 12ca065..a33d15f 100644
--- a/compiler/dex/quick/gen_common.cc
+++ b/compiler/dex/quick/gen_common.cc
@@ -1606,7 +1606,8 @@
       rl_result = GenDivRem(rl_dest, rl_src1.reg, rl_src2.reg, op == kOpDiv);
       done = true;
     } else if (cu_->instruction_set == kThumb2) {
-      if (cu_->GetInstructionSetFeatures().HasDivideInstruction()) {
+      if (cu_->GetInstructionSetFeatures()->AsArmInstructionSetFeatures()->
+              HasDivideInstruction()) {
         // Use ARM SDIV instruction for division.  For remainder we also need to
         // calculate using a MUL and subtract.
         rl_src1 = LoadValue(rl_src1, kCoreReg);
@@ -1875,7 +1876,8 @@
         rl_result = GenDivRemLit(rl_dest, rl_src, lit, is_div);
         done = true;
       } else if (cu_->instruction_set == kThumb2) {
-        if (cu_->GetInstructionSetFeatures().HasDivideInstruction()) {
+        if (cu_->GetInstructionSetFeatures()->AsArmInstructionSetFeatures()->
+                HasDivideInstruction()) {
           // Use ARM SDIV instruction for division.  For remainder we also need to
           // calculate using a MUL and subtract.
           rl_src = LoadValue(rl_src, kCoreReg);
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index fb648fc..aac33d2 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -329,7 +329,7 @@
                                DexFileToMethodInlinerMap* method_inliner_map,
                                Compiler::Kind compiler_kind,
                                InstructionSet instruction_set,
-                               InstructionSetFeatures instruction_set_features,
+                               const InstructionSetFeatures* instruction_set_features,
                                bool image, std::set<std::string>* image_classes, size_t thread_count,
                                bool dump_stats, bool dump_passes, CumulativeLogger* timer,
                                std::string profile_file)
diff --git a/compiler/driver/compiler_driver.h b/compiler/driver/compiler_driver.h
index c445683..0425d27 100644
--- a/compiler/driver/compiler_driver.h
+++ b/compiler/driver/compiler_driver.h
@@ -88,7 +88,7 @@
                           DexFileToMethodInlinerMap* method_inliner_map,
                           Compiler::Kind compiler_kind,
                           InstructionSet instruction_set,
-                          InstructionSetFeatures instruction_set_features,
+                          const InstructionSetFeatures* instruction_set_features,
                           bool image, std::set<std::string>* image_classes,
                           size_t thread_count, bool dump_stats, bool dump_passes,
                           CumulativeLogger* timer, std::string profile_file = "");
@@ -115,7 +115,7 @@
     return instruction_set_;
   }
 
-  InstructionSetFeatures GetInstructionSetFeatures() const {
+  const InstructionSetFeatures* GetInstructionSetFeatures() const {
     return instruction_set_features_;
   }
 
@@ -475,7 +475,7 @@
   std::unique_ptr<Compiler> compiler_;
 
   const InstructionSet instruction_set_;
-  const InstructionSetFeatures instruction_set_features_;
+  const InstructionSetFeatures* const instruction_set_features_;
 
   // All class references that require
   mutable ReaderWriterMutex freezing_constructor_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
diff --git a/compiler/jni/jni_compiler_test.cc b/compiler/jni/jni_compiler_test.cc
index fd7d350..0fea2a7 100644
--- a/compiler/jni/jni_compiler_test.cc
+++ b/compiler/jni/jni_compiler_test.cc
@@ -73,10 +73,10 @@
     }
     ASSERT_TRUE(method != nullptr) << method_name << " " << method_sig;
     if (check_generic_jni_) {
-      method->SetEntryPointFromQuickCompiledCode(class_linker_->GetQuickGenericJniTrampoline());
+      method->SetEntryPointFromQuickCompiledCode(class_linker_->GetRuntimeQuickGenericJniStub());
     } else {
-      if (method->GetEntryPointFromQuickCompiledCode() == nullptr ||
-          method->GetEntryPointFromQuickCompiledCode() == class_linker_->GetQuickGenericJniTrampoline()) {
+      const void* code = method->GetEntryPointFromQuickCompiledCode();
+      if (code == nullptr || class_linker_->IsQuickGenericJniStub(code)) {
         CompileMethod(method);
         ASSERT_TRUE(method->GetEntryPointFromQuickCompiledCode() != nullptr)
             << method_name << " " << method_sig;
diff --git a/compiler/oat_test.cc b/compiler/oat_test.cc
index 3fcc369..a9d30b6 100644
--- a/compiler/oat_test.cc
+++ b/compiler/oat_test.cc
@@ -95,7 +95,10 @@
       : Compiler::kQuick;
   InstructionSet insn_set = kIsTargetBuild ? kThumb2 : kX86;
 
-  InstructionSetFeatures insn_features;
+  std::string error_msg;
+  std::unique_ptr<const InstructionSetFeatures> insn_features(
+      InstructionSetFeatures::FromFeatureString(insn_set, "default", &error_msg));
+  ASSERT_TRUE(insn_features.get() != nullptr) << error_msg;
   compiler_options_.reset(new CompilerOptions);
   verification_results_.reset(new VerificationResults(compiler_options_.get()));
   method_inliner_map_.reset(new DexFileToMethodInlinerMap);
@@ -106,7 +109,7 @@
                                             verification_results_.get(),
                                             method_inliner_map_.get(),
                                             compiler_kind, insn_set,
-                                            insn_features, false, NULL, 2, true, true,
+                                            insn_features.get(), false, NULL, 2, true, true,
                                             timer_.get()));
   jobject class_loader = NULL;
   if (kCompile) {
@@ -135,7 +138,6 @@
   if (kCompile) {  // OatWriter strips the code, regenerate to compare
     compiler_driver_->CompileAll(class_loader, class_linker->GetBootClassPath(), &timings);
   }
-  std::string error_msg;
   std::unique_ptr<OatFile> oat_file(OatFile::Open(tmp.GetFilename(), tmp.GetFilename(), NULL, false,
                                             &error_msg));
   ASSERT_TRUE(oat_file.get() != nullptr) << error_msg;
@@ -193,13 +195,16 @@
 }
 
 TEST_F(OatTest, OatHeaderIsValid) {
-    InstructionSet instruction_set = kX86;
-    InstructionSetFeatures instruction_set_features;
+    InstructionSet insn_set = kX86;
+    std::string error_msg;
+    std::unique_ptr<const InstructionSetFeatures> insn_features(
+        InstructionSetFeatures::FromFeatureString(insn_set, "default", &error_msg));
+    ASSERT_TRUE(insn_features.get() != nullptr) << error_msg;
     std::vector<const DexFile*> dex_files;
     uint32_t image_file_location_oat_checksum = 0;
     uint32_t image_file_location_oat_begin = 0;
-    std::unique_ptr<OatHeader> oat_header(OatHeader::Create(instruction_set,
-                                                            instruction_set_features,
+    std::unique_ptr<OatHeader> oat_header(OatHeader::Create(insn_set,
+                                                            insn_features.get(),
                                                             &dex_files,
                                                             image_file_location_oat_checksum,
                                                             image_file_location_oat_begin,
diff --git a/compiler/optimizing/gvn.h b/compiler/optimizing/gvn.h
index 41b3ceb..a98d714 100644
--- a/compiler/optimizing/gvn.h
+++ b/compiler/optimizing/gvn.h
@@ -17,7 +17,6 @@
 #ifndef ART_COMPILER_OPTIMIZING_GVN_H_
 #define ART_COMPILER_OPTIMIZING_GVN_H_
 
-#include <gtest/gtest.h>
 #include "nodes.h"
 
 namespace art {
@@ -221,7 +220,7 @@
   // Mark visisted blocks. Only used for debugging.
   GrowableArray<bool> visited_;
 
-  FRIEND_TEST(GVNTest, LoopSideEffects);
+  ART_FRIEND_TEST(GVNTest, LoopSideEffects);
   DISALLOW_COPY_AND_ASSIGN(GlobalValueNumberer);
 };
 
diff --git a/compiler/optimizing/register_allocator.h b/compiler/optimizing/register_allocator.h
index d4c233a..0c3a9b3 100644
--- a/compiler/optimizing/register_allocator.h
+++ b/compiler/optimizing/register_allocator.h
@@ -21,8 +21,6 @@
 #include "primitive.h"
 #include "utils/growable_array.h"
 
-#include "gtest/gtest.h"
-
 namespace art {
 
 class CodeGenerator;
@@ -189,7 +187,7 @@
   // The maximum live registers at safepoints.
   size_t maximum_number_of_live_registers_;
 
-  FRIEND_TEST(RegisterAllocatorTest, FreeUntil);
+  ART_FRIEND_TEST(RegisterAllocatorTest, FreeUntil);
 
   DISALLOW_COPY_AND_ASSIGN(RegisterAllocator);
 };
diff --git a/compiler/utils/arena_allocator.cc b/compiler/utils/arena_allocator.cc
index 516ac2b..0c93f0a 100644
--- a/compiler/utils/arena_allocator.cc
+++ b/compiler/utils/arena_allocator.cc
@@ -15,6 +15,7 @@
  */
 
 #include <algorithm>
+#include <iomanip>
 #include <numeric>
 
 #include "arena_allocator.h"