[es6] Correct Function.prototype.apply, Reflect.construct and Reflect.apply.

src/arm64/builtins-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/arm64/frames-arm64.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
@@ skipping 1292 matching lines @@
     // (which is a copy of the last argument).
     __ Sub(argc, argc, 1);
     __ Drop(1);
   }
 
   // 4. Call the callable.
   __ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
 }
 
 
-static void Generate_PushAppliedArguments(MacroAssembler* masm,
-                                          const int vectorOffset,
-                                          const int argumentsOffset,
-                                          const int indexOffset,
-                                          const int limitOffset) {
-  Label entry, loop;
-  Register receiver = LoadDescriptor::ReceiverRegister();
-  Register key = LoadDescriptor::NameRegister();
-  Register slot = LoadDescriptor::SlotRegister();
-  Register vector = LoadWithVectorDescriptor::VectorRegister();
-
-  __ Ldr(key, MemOperand(fp, indexOffset));
-  __ B(&entry);
-
-  // Load the current argument from the arguments array.
-  __ Bind(&loop);
-  __ Ldr(receiver, MemOperand(fp, argumentsOffset));
-
-  // Use inline caching to speed up access to arguments.
-  int slot_index = TypeFeedbackVector::PushAppliedArgumentsIndex();
-  __ Mov(slot, Operand(Smi::FromInt(slot_index)));
-  __ Ldr(vector, MemOperand(fp, vectorOffset));
-  Handle<Code> ic =
-      KeyedLoadICStub(masm->isolate(), LoadICState(kNoExtraICState)).GetCode();
-  __ Call(ic, RelocInfo::CODE_TARGET);
-
-  // Push the nth argument.
-  __ Push(x0);
-
-  __ Ldr(key, MemOperand(fp, indexOffset));
-  __ Add(key, key, Smi::FromInt(1));
-  __ Str(key, MemOperand(fp, indexOffset));
-
-  // Test if the copy loop has finished copying all the elements from the
-  // arguments object.
-  __ Bind(&entry);
-  __ Ldr(x1, MemOperand(fp, limitOffset));
-  __ Cmp(key, x1);
-  __ B(ne, &loop);
-
-  // On exit, the pushed arguments count is in x0, untagged
-  __ Mov(x0, key);
-  __ SmiUntag(x0);
-}
-
-
-static void Generate_ApplyHelper(MacroAssembler* masm, bool targetIsArgument) {
-  const int kFormalParameters = targetIsArgument ? 3 : 2;
-  const int kStackSize = kFormalParameters + 1;
-
-  {
-    FrameScope frame_scope(masm, StackFrame::INTERNAL);
-
-    const int kArgumentsOffset =  kFPOnStackSize + kPCOnStackSize;
-    const int kReceiverOffset = kArgumentsOffset + kPointerSize;
-    const int kFunctionOffset = kReceiverOffset + kPointerSize;
-    const int kVectorOffset =
-        InternalFrameConstants::kCodeOffset - 1 * kPointerSize;
-    const int kIndexOffset = kVectorOffset - (2 * kPointerSize);
-    const int kLimitOffset = kVectorOffset - (1 * kPointerSize);
-
-    Register args = x12;
-    Register receiver = x14;
-    Register function = x15;
-    Register apply_function = x1;
-
-    // Push the vector.
-    __ Ldr(
-        apply_function,
-        FieldMemOperand(apply_function, JSFunction::kSharedFunctionInfoOffset));
-    __ Ldr(apply_function,
-           FieldMemOperand(apply_function,
-                           SharedFunctionInfo::kFeedbackVectorOffset));
-    __ Push(apply_function);
-
-    // Get the length of the arguments via a builtin call.
-    __ Ldr(function, MemOperand(fp, kFunctionOffset));
-    __ Ldr(args, MemOperand(fp, kArgumentsOffset));
-    __ Push(function, args);
-    if (targetIsArgument) {
-      __ InvokeBuiltin(Context::REFLECT_APPLY_PREPARE_BUILTIN_INDEX,
-                       CALL_FUNCTION);
-    } else {
-      __ InvokeBuiltin(Context::APPLY_PREPARE_BUILTIN_INDEX, CALL_FUNCTION);
-    }
-    Register argc = x0;
-
-    Generate_CheckStackOverflow(masm, argc, kArgcIsSmiTagged);
-
-    // Push current limit, index and receiver.
-    __ Mov(x1, 0);  // Initial index.
-    __ Ldr(receiver, MemOperand(fp, kReceiverOffset));
-    __ Push(argc, x1, receiver);
-
-    // Copy all arguments from the array to the stack.
-    Generate_PushAppliedArguments(masm, kVectorOffset, kArgumentsOffset,
-                                  kIndexOffset, kLimitOffset);
-
-    // At the end of the loop, the number of arguments is stored in x0, untagged
-
-    // Call the callable.
-    // TODO(bmeurer): This should be a tail call according to ES6.
-    __ Ldr(x1, MemOperand(fp, kFunctionOffset));
-    __ Call(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
-  }
-  __ Drop(kStackSize);
-  __ Ret();
-}
-
-
-static void Generate_ConstructHelper(MacroAssembler* masm) {
-  const int kFormalParameters = 3;
-  const int kStackSize = kFormalParameters + 1;
-
-  {
-    FrameScope frame_scope(masm, StackFrame::INTERNAL);
-
-    const int kNewTargetOffset = kFPOnStackSize + kPCOnStackSize;
-    const int kArgumentsOffset =  kNewTargetOffset + kPointerSize;
-    const int kFunctionOffset = kArgumentsOffset + kPointerSize;
-    const int kVectorOffset =
-        InternalFrameConstants::kCodeOffset - 1 * kPointerSize;
-    const int kIndexOffset = kVectorOffset - (2 * kPointerSize);
-    const int kLimitOffset = kVectorOffset - (1 * kPointerSize);
-
-    // Is x11 safe to use?
-    Register newTarget = x11;
-    Register args = x12;
-    Register function = x15;
-    Register construct_function = x1;
-
-    // Push the vector.
-    __ Ldr(construct_function,
-           FieldMemOperand(construct_function,
-                           JSFunction::kSharedFunctionInfoOffset));
-    __ Ldr(construct_function,
-           FieldMemOperand(construct_function,
-                           SharedFunctionInfo::kFeedbackVectorOffset));
-    __ Push(construct_function);
-
-    // If newTarget is not supplied, set it to constructor
-    Label validate_arguments;
-    __ Ldr(x0, MemOperand(fp, kNewTargetOffset));
-    __ CompareRoot(x0, Heap::kUndefinedValueRootIndex);
-    __ B(ne, &validate_arguments);
-    __ Ldr(x0, MemOperand(fp, kFunctionOffset));
-    __ Str(x0, MemOperand(fp, kNewTargetOffset));
-
-    // Validate arguments
-    __ Bind(&validate_arguments);
-    __ Ldr(function, MemOperand(fp, kFunctionOffset));
-    __ Ldr(args, MemOperand(fp, kArgumentsOffset));
-    __ Ldr(newTarget, MemOperand(fp, kNewTargetOffset));
-    __ Push(function, args, newTarget);
-    __ InvokeBuiltin(Context::REFLECT_CONSTRUCT_PREPARE_BUILTIN_INDEX,
-                     CALL_FUNCTION);
-    Register argc = x0;
-
-    Generate_CheckStackOverflow(masm, argc, kArgcIsSmiTagged);
-
-    // Push current limit and index & constructor function as callee.
-    __ Mov(x1, 0);  // Initial index.
-    __ Push(argc, x1, function);
-
-    // Copy all arguments from the array to the stack.
-    Generate_PushAppliedArguments(masm, kVectorOffset, kArgumentsOffset,
-                                  kIndexOffset, kLimitOffset);
-
-    // Use undefined feedback vector
+void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- r0     : argc
+  //  -- sp[0]  : argArray
+  //  -- sp[8]  : thisArg
+  //  -- sp[16] : receiver
+  // -----------------------------------
+  ASM_LOCATION("Builtins::Generate_FunctionApply");
+
+  // 1. Load receiver into x1, argArray into x0 (if present), remove all
+  // arguments from the stack (including the receiver), and push thisArg (if
+  // present) instead.
+  {
+    Label done;
     __ LoadRoot(x2, Heap::kUndefinedValueRootIndex);
-    __ Ldr(x1, MemOperand(fp, kFunctionOffset));
-    __ Ldr(x3, MemOperand(fp, kNewTargetOffset));
-
-    // Call the function.
-    __ Call(masm->isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
-
-    // Leave internal frame.
-  }
-  __ Drop(kStackSize);
-  __ Ret();
-}
-
-
-void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
-  ASM_LOCATION("Builtins::Generate_FunctionApply");
-  Generate_ApplyHelper(masm, false);
+    __ Mov(x3, x2);
+    __ Peek(x1, Operand(x0, LSL, kPointerSizeLog2));  // receiver
+    __ Subs(x4, x0, 1);
+    __ B(lt, &done);
+    __ Peek(x2, Operand(x4, LSL, kPointerSizeLog2));  // thisArg
+    __ Subs(x4, x4, 1);
+    __ B(lt, &done);
+    __ Peek(x3, Operand(x4, LSL, kPointerSizeLog2));  // argArray
+    __ Bind(&done);
+    __ Drop(x0);
+    __ Poke(x2, 0);
+    __ Mov(x0, x3);
+  }
+
+  // ----------- S t a t e -------------
+  //  -- x0    : argArray
+  //  -- x1    : receiver
+  //  -- sp[0] : thisArg
+  // -----------------------------------
+
+  // 2. Make sure the receiver is actually callable.
+  Label receiver_not_callable;
+  __ JumpIfSmi(x1, &receiver_not_callable);
+  __ Ldr(x4, FieldMemOperand(x1, HeapObject::kMapOffset));
+  __ Ldrb(x4, FieldMemOperand(x4, Map::kBitFieldOffset));
+  __ TestAndBranchIfAllClear(x4, 1 << Map::kIsCallable, &receiver_not_callable);
+
+  // 3. Tail call with no arguments if argArray is null or undefined.
+  Label no_arguments;
+  __ JumpIfRoot(x0, Heap::kNullValueRootIndex, &no_arguments);
+  __ JumpIfRoot(x0, Heap::kUndefinedValueRootIndex, &no_arguments);
+
+  // 4a. Apply the receiver to the given argArray (passing undefined for
+  // new.target).
+  __ LoadRoot(x3, Heap::kUndefinedValueRootIndex);
+  __ Jump(masm->isolate()->builtins()->Apply(), RelocInfo::CODE_TARGET);
+
+  // 4b. The argArray is either null or undefined, so we tail call without any
+  // arguments to the receiver.
+  __ Bind(&no_arguments);
+  {
+    __ Mov(x0, 0);
+    __ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
+  }
+
+  // 4c. The receiver is not callable, throw an appropriate TypeError.
+  __ Bind(&receiver_not_callable);
+  {
+    __ Poke(x1, 0);
+    __ TailCallRuntime(Runtime::kThrowApplyNonFunction, 1, 1);
+  }
 }
 
 
 void Builtins::Generate_ReflectApply(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- x0     : argc
+  //  -- sp[0]  : argumentsList
+  //  -- sp[8]  : thisArgument
+  //  -- sp[16] : target
+  //  -- sp[24] : receiver
+  // -----------------------------------
   ASM_LOCATION("Builtins::Generate_ReflectApply");
-  Generate_ApplyHelper(masm, true);
+
+  // 1. Load target into x1 (if present), argumentsList into x0 (if present),
+  // remove all arguments from the stack (including the receiver), and push
+  // thisArgument (if present) instead.
+  {
+    Label done;
+    __ LoadRoot(x1, Heap::kUndefinedValueRootIndex);
+    __ Mov(x2, x1);
+    __ Mov(x3, x1);
+    __ Subs(x4, x0, 1);
+    __ B(lt, &done);
+    __ Peek(x1, Operand(x4, LSL, kPointerSizeLog2));  // target
+    __ Subs(x4, x4, 1);
+    __ B(lt, &done);
+    __ Peek(x2, Operand(x4, LSL, kPointerSizeLog2));  // thisArgument
+    __ Subs(x4, x4, 1);
+    __ B(lt, &done);
+    __ Peek(x3, Operand(x4, LSL, kPointerSizeLog2));  // argumentsList
+    __ Bind(&done);
+    __ Drop(x0);
+    __ Poke(x2, 0);
+    __ Mov(x0, x3);
+  }
+
+  // ----------- S t a t e -------------
+  //  -- x0    : argumentsList
+  //  -- x1    : target
+  //  -- sp[0] : thisArgument
+  // -----------------------------------
+
+  // 2. Make sure the target is actually callable.
+  Label target_not_callable;
+  __ JumpIfSmi(x1, &target_not_callable);
+  __ Ldr(x4, FieldMemOperand(x1, HeapObject::kMapOffset));
+  __ Ldrb(x4, FieldMemOperand(x4, Map::kBitFieldOffset));
+  __ TestAndBranchIfAllClear(x4, 1 << Map::kIsCallable, &target_not_callable);
+
+  // 3a. Apply the target to the given argumentsList (passing undefined for
+  // new.target).
+  __ LoadRoot(x3, Heap::kUndefinedValueRootIndex);
+  __ Jump(masm->isolate()->builtins()->Apply(), RelocInfo::CODE_TARGET);
+
+  // 3b. The target is not callable, throw an appropriate TypeError.
+  __ Bind(&target_not_callable);
+  {
+    __ Poke(x1, 0);
+    __ TailCallRuntime(Runtime::kThrowApplyNonFunction, 1, 1);
+  }
 }
 
 
 void Builtins::Generate_ReflectConstruct(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- x0     : argc
+  //  -- sp[0]  : new.target (optional)
+  //  -- sp[8]  : argumentsList
+  //  -- sp[16] : target
+  //  -- sp[24] : receiver
+  // -----------------------------------
   ASM_LOCATION("Builtins::Generate_ReflectConstruct");
-  Generate_ConstructHelper(masm);
-}
-
-
+
+  // 1. Load target into x1 (if present), argumentsList into x0 (if present),
+  // new.target into x3 (if present, otherwise use target), remove all
+  // arguments from the stack (including the receiver), and push thisArgument
+  // (if present) instead.
+  {
+    Label done;
+    __ LoadRoot(x1, Heap::kUndefinedValueRootIndex);
+    __ Mov(x2, x1);
+    __ Poke(x2, Operand(x0, LSL, kPointerSizeLog2));  // receiver
+    __ Subs(x4, x0, 1);
+    __ B(lt, &done);
+    __ Peek(x1, Operand(x4, LSL, kPointerSizeLog2));  // target
+    __ Mov(x3, x1);  // new.target defaults to target
+    __ Subs(x4, x4, 1);
+    __ B(lt, &done);
+    __ Peek(x2, Operand(x4, LSL, kPointerSizeLog2));  // argumentsList
+    __ Subs(x4, x4, 1);
+    __ B(lt, &done);
+    __ Peek(x3, Operand(x4, LSL, kPointerSizeLog2));  // new.target
+    __ Bind(&done);
+    __ Drop(x0);
+    __ Mov(x0, x2);
+  }
+
+  // ----------- S t a t e -------------
+  //  -- x0    : argumentsList
+  //  -- x3    : new.target
+  //  -- x1    : target
+  //  -- sp[0] : receiver (undefined)
+  // -----------------------------------
+
+  // 2. Make sure the target is actually a constructor.
+  Label target_not_constructor;
+  __ JumpIfSmi(x1, &target_not_constructor);
+  __ Ldr(x4, FieldMemOperand(x1, HeapObject::kMapOffset));
+  __ Ldrb(x4, FieldMemOperand(x4, Map::kBitFieldOffset));
+  __ TestAndBranchIfAllClear(x4, 1 << Map::kIsConstructor,
+                             &target_not_constructor);
+
+  // 3. Make sure the target is actually a constructor.
+  Label new_target_not_constructor;
+  __ JumpIfSmi(x3, &new_target_not_constructor);
+  __ Ldr(x4, FieldMemOperand(x3, HeapObject::kMapOffset));
+  __ Ldrb(x4, FieldMemOperand(x4, Map::kBitFieldOffset));
+  __ TestAndBranchIfAllClear(x4, 1 << Map::kIsConstructor,
+                             &new_target_not_constructor);
+
+  // 4a. Construct the target with the given new.target and argumentsList.
+  __ Jump(masm->isolate()->builtins()->Apply(), RelocInfo::CODE_TARGET);
+
+  // 4b. The target is not a constructor, throw an appropriate TypeError.
+  __ Bind(&target_not_constructor);
+  {
+    __ Poke(x1, 0);
+    __ TailCallRuntime(Runtime::kThrowCalledNonCallable, 1, 1);
+  }
+
+  // 4c. The new.target is not a constructor, throw an appropriate TypeError.
+  __ Bind(&new_target_not_constructor);
+  {
+    __ Poke(x3, 0);
+    __ TailCallRuntime(Runtime::kThrowCalledNonCallable, 1, 1);
+  }
+}
+
+
 static void ArgumentAdaptorStackCheck(MacroAssembler* masm,
                                       Label* stack_overflow) {
   // ----------- S t a t e -------------
   //  -- x0 : actual number of arguments
   //  -- x1 : function (passed through to callee)
   //  -- x2 : expected number of arguments
   //  -- x3 : new target (passed through to callee)
   // -----------------------------------
   // Check the stack for overflow.
   // We are not trying to catch interruptions (e.g. debug break and
@@ skipping 28 matching lines @@
   __ Ldr(x10, MemOperand(fp, -(StandardFrameConstants::kFixedFrameSizeFromFp +
                                kPointerSize)));
   __ Mov(jssp, fp);
   __ Pop(fp, lr);
   __ DropBySMI(x10, kXRegSize);
   __ Drop(1);
 }
 
 
 // static
+void Builtins::Generate_Apply(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- x0    : argumentsList
+  //  -- x1    : target
+  //  -- x3    : new.target (checked to be constructor or undefined)
+  //  -- sp[0] : thisArgument
+  // -----------------------------------
+
+  // Create the list of arguments from the array-like argumentsList.
+  {
+    Label create_arguments, create_array, create_runtime, done_create;
+    __ JumpIfSmi(x0, &create_runtime);
+
+    // Load the map of argumentsList into x2.
+    __ Ldr(x2, FieldMemOperand(x0, HeapObject::kMapOffset));
+
+    // Load native context into x4.
+    __ Ldr(x4, NativeContextMemOperand());
+
+    // Check if argumentsList is an (unmodified) arguments object.
+    __ Ldr(x5, ContextMemOperand(x4, Context::SLOPPY_ARGUMENTS_MAP_INDEX));
+    __ Cmp(x5, x2);
+    __ B(eq, &create_arguments);
+    __ Ldr(x5, ContextMemOperand(x4, Context::STRICT_ARGUMENTS_MAP_INDEX));
+    __ Cmp(x5, x2);
+    __ B(eq, &create_arguments);
+
+    // Check if argumentsList is a fast JSArray.
+    __ CompareInstanceType(x2, x4, JS_ARRAY_TYPE);
+    __ B(eq, &create_array);
+
+    // Ask the runtime to create the list (actually a FixedArray).
+    __ Bind(&create_runtime);
+    {
+      FrameScope scope(masm, StackFrame::INTERNAL);
+      __ Push(x1, x3, x0);
+      __ CallRuntime(Runtime::kCreateListFromArrayLike, 1);
+      __ Pop(x3, x1);
+      __ Ldrsw(x2, UntagSmiFieldMemOperand(x0, FixedArray::kLengthOffset));
+    }
+    __ B(&done_create);
+
+    // Try to create the list from an arguments object.
+    __ Bind(&create_arguments);
+    __ Ldr(x2,
+           FieldMemOperand(x0, JSObject::kHeaderSize +
+                                   Heap::kArgumentsLengthIndex * kPointerSize));
+    __ Ldr(x4, FieldMemOperand(x0, JSObject::kElementsOffset));
+    __ Ldr(x5, FieldMemOperand(x4, FixedArray::kLengthOffset));
+    __ Cmp(x2, x4);
+    __ B(ne, &create_runtime);
+    __ SmiUntag(x2);
+    __ Mov(x0, x4);
+    __ B(&done_create);
+
+    // Try to create the list from a JSArray object.
+    __ Bind(&create_array);
+    __ Ldr(x2, FieldMemOperand(x2, Map::kBitField2Offset));
+    __ DecodeField<Map::ElementsKindBits>(x2);
+    STATIC_ASSERT(FAST_SMI_ELEMENTS == 0);
+    STATIC_ASSERT(FAST_HOLEY_SMI_ELEMENTS == 1);
+    STATIC_ASSERT(FAST_ELEMENTS == 2);
+    __ Cmp(x2, FAST_ELEMENTS);
+    __ B(hi, &create_runtime);
+    __ Cmp(x2, FAST_HOLEY_SMI_ELEMENTS);
+    __ B(eq, &create_runtime);
+    __ Ldrsw(x2, UntagSmiFieldMemOperand(x0, JSArray::kLengthOffset));
+    __ Ldr(x0, FieldMemOperand(x0, JSArray::kElementsOffset));
+
+    __ Bind(&done_create);
+  }
+
+  // Check for stack overflow.
+  {
+    // Check the stack for overflow. We are not trying to catch interruptions
+    // (i.e. debug break and preemption) here, so check the "real stack limit".
+    Label done;
+    __ LoadRoot(x10, Heap::kRealStackLimitRootIndex);
+    // Make x10 the space we have left. The stack might already be overflowed
+    // here which will cause x10 to become negative.
+    __ Sub(x10, jssp, x10);
+    // Check if the arguments will overflow the stack.
+    __ Cmp(x10, Operand(x2, LSL, kPointerSizeLog2));
+    __ B(gt, &done);  // Signed comparison.
+    __ TailCallRuntime(Runtime::kThrowStackOverflow, 1, 1);
+    __ Bind(&done);
+  }
+
+  // ----------- S t a t e -------------
+  //  -- x1    : target
+  //  -- x0    : args (a FixedArray built from argumentsList)
+  //  -- x2    : len (number of elements to push from args)
+  //  -- x3    : new.target (checked to be constructor or undefined)
+  //  -- sp[0] : thisArgument
+  // -----------------------------------
+
+  // Push arguments onto the stack (thisArgument is already on the stack).
+  {
+    __ Mov(x4, 0);
+    Label done, loop;
+    __ Bind(&loop);
+    __ Cmp(x4, x2);
+    __ B(eq, &done);
+    __ Add(x10, x0, Operand(x4, LSL, kPointerSizeLog2));
+    __ Ldr(x10, FieldMemOperand(x10, FixedArray::kHeaderSize));
+    __ Push(x10);
+    __ Add(x4, x4, 1);
+    __ B(&loop);
+    __ Bind(&done);
+    __ Mov(x0, x4);
+  }
+
+  // Dispatch to Call or Construct depending on whether new.target is undefined.
+  {
+    __ CompareRoot(x3, Heap::kUndefinedValueRootIndex);
+    __ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET, eq);
+    __ Jump(masm->isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
+  }
+}
+
+
+// static
 void Builtins::Generate_CallFunction(MacroAssembler* masm,
                                      ConvertReceiverMode mode) {
   // ----------- S t a t e -------------
   //  -- x0 : the number of arguments (not including the receiver)
   //  -- x1 : the function to call (checked to be a JSFunction)
   // -----------------------------------
   __ AssertFunction(x1);
 
   // See ES6 section 9.2.1 [[Call]] ( thisArgument, argumentsList)
   // Check that function is not a "classConstructor".
@@ skipping 467 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM