Upgrade to 3.29
Update V8 to 3.29.88.17 and update makefiles to support building on
all the relevant platforms.
Bug: 17370214
Change-Id: Ia3407c157fd8d72a93e23d8318ccaf6ecf77fa4e
diff --git a/src/arm64/builtins-arm64.cc b/src/arm64/builtins-arm64.cc
new file mode 100644
index 0000000..0013e24
--- /dev/null
+++ b/src/arm64/builtins-arm64.cc
@@ -0,0 +1,1564 @@
+// 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.
+
+#include "src/v8.h"
+
+#if V8_TARGET_ARCH_ARM64
+
+#include "src/codegen.h"
+#include "src/debug.h"
+#include "src/deoptimizer.h"
+#include "src/full-codegen.h"
+#include "src/runtime.h"
+
+namespace v8 {
+namespace internal {
+
+
+#define __ ACCESS_MASM(masm)
+
+
+// Load the built-in Array function from the current context.
+static void GenerateLoadArrayFunction(MacroAssembler* masm, Register result) {
+ // Load the native context.
+ __ Ldr(result, GlobalObjectMemOperand());
+ __ Ldr(result,
+ FieldMemOperand(result, GlobalObject::kNativeContextOffset));
+ // Load the InternalArray function from the native context.
+ __ Ldr(result,
+ MemOperand(result,
+ Context::SlotOffset(Context::ARRAY_FUNCTION_INDEX)));
+}
+
+
+// Load the built-in InternalArray function from the current context.
+static void GenerateLoadInternalArrayFunction(MacroAssembler* masm,
+ Register result) {
+ // Load the native context.
+ __ Ldr(result, GlobalObjectMemOperand());
+ __ Ldr(result,
+ FieldMemOperand(result, GlobalObject::kNativeContextOffset));
+ // Load the InternalArray function from the native context.
+ __ Ldr(result, ContextMemOperand(result,
+ Context::INTERNAL_ARRAY_FUNCTION_INDEX));
+}
+
+
+void Builtins::Generate_Adaptor(MacroAssembler* masm,
+ CFunctionId id,
+ BuiltinExtraArguments extra_args) {
+ // ----------- S t a t e -------------
+ // -- x0 : number of arguments excluding receiver
+ // -- x1 : called function (only guaranteed when
+ // extra_args requires it)
+ // -- cp : context
+ // -- sp[0] : last argument
+ // -- ...
+ // -- sp[4 * (argc - 1)] : first argument (argc == x0)
+ // -- sp[4 * argc] : receiver
+ // -----------------------------------
+
+ // Insert extra arguments.
+ int num_extra_args = 0;
+ if (extra_args == NEEDS_CALLED_FUNCTION) {
+ num_extra_args = 1;
+ __ Push(x1);
+ } else {
+ DCHECK(extra_args == NO_EXTRA_ARGUMENTS);
+ }
+
+ // JumpToExternalReference expects x0 to contain the number of arguments
+ // including the receiver and the extra arguments.
+ __ Add(x0, x0, num_extra_args + 1);
+ __ JumpToExternalReference(ExternalReference(id, masm->isolate()));
+}
+
+
+void Builtins::Generate_InternalArrayCode(MacroAssembler* masm) {
+ // ----------- S t a t e -------------
+ // -- x0 : number of arguments
+ // -- lr : return address
+ // -- sp[...]: constructor arguments
+ // -----------------------------------
+ ASM_LOCATION("Builtins::Generate_InternalArrayCode");
+ Label generic_array_code;
+
+ // Get the InternalArray function.
+ GenerateLoadInternalArrayFunction(masm, x1);
+
+ if (FLAG_debug_code) {
+ // Initial map for the builtin InternalArray functions should be maps.
+ __ Ldr(x10, FieldMemOperand(x1, JSFunction::kPrototypeOrInitialMapOffset));
+ __ Tst(x10, kSmiTagMask);
+ __ Assert(ne, kUnexpectedInitialMapForInternalArrayFunction);
+ __ CompareObjectType(x10, x11, x12, MAP_TYPE);
+ __ Assert(eq, kUnexpectedInitialMapForInternalArrayFunction);
+ }
+
+ // Run the native code for the InternalArray function called as a normal
+ // function.
+ InternalArrayConstructorStub stub(masm->isolate());
+ __ TailCallStub(&stub);
+}
+
+
+void Builtins::Generate_ArrayCode(MacroAssembler* masm) {
+ // ----------- S t a t e -------------
+ // -- x0 : number of arguments
+ // -- lr : return address
+ // -- sp[...]: constructor arguments
+ // -----------------------------------
+ ASM_LOCATION("Builtins::Generate_ArrayCode");
+ Label generic_array_code, one_or_more_arguments, two_or_more_arguments;
+
+ // Get the Array function.
+ GenerateLoadArrayFunction(masm, x1);
+
+ if (FLAG_debug_code) {
+ // Initial map for the builtin Array functions should be maps.
+ __ Ldr(x10, FieldMemOperand(x1, JSFunction::kPrototypeOrInitialMapOffset));
+ __ Tst(x10, kSmiTagMask);
+ __ Assert(ne, kUnexpectedInitialMapForArrayFunction);
+ __ CompareObjectType(x10, x11, x12, MAP_TYPE);
+ __ Assert(eq, kUnexpectedInitialMapForArrayFunction);
+ }
+
+ // Run the native code for the Array function called as a normal function.
+ __ LoadRoot(x2, Heap::kUndefinedValueRootIndex);
+ ArrayConstructorStub stub(masm->isolate());
+ __ TailCallStub(&stub);
+}
+
+
+void Builtins::Generate_StringConstructCode(MacroAssembler* masm) {
+ // ----------- S t a t e -------------
+ // -- x0 : number of arguments
+ // -- x1 : constructor function
+ // -- lr : return address
+ // -- sp[(argc - n - 1) * 8] : arg[n] (zero based)
+ // -- sp[argc * 8] : receiver
+ // -----------------------------------
+ ASM_LOCATION("Builtins::Generate_StringConstructCode");
+ Counters* counters = masm->isolate()->counters();
+ __ IncrementCounter(counters->string_ctor_calls(), 1, x10, x11);
+
+ Register argc = x0;
+ Register function = x1;
+ if (FLAG_debug_code) {
+ __ LoadGlobalFunction(Context::STRING_FUNCTION_INDEX, x10);
+ __ Cmp(function, x10);
+ __ Assert(eq, kUnexpectedStringFunction);
+ }
+
+ // Load the first arguments in x0 and get rid of the rest.
+ Label no_arguments;
+ __ Cbz(argc, &no_arguments);
+ // First args = sp[(argc - 1) * 8].
+ __ Sub(argc, argc, 1);
+ __ Claim(argc, kXRegSize);
+ // jssp now point to args[0], load and drop args[0] + receiver.
+ Register arg = argc;
+ __ Ldr(arg, MemOperand(jssp, 2 * kPointerSize, PostIndex));
+ argc = NoReg;
+
+ Register argument = x2;
+ Label not_cached, argument_is_string;
+ __ LookupNumberStringCache(arg, // Input.
+ argument, // Result.
+ x10, // Scratch.
+ x11, // Scratch.
+ x12, // Scratch.
+ ¬_cached);
+ __ IncrementCounter(counters->string_ctor_cached_number(), 1, x10, x11);
+ __ Bind(&argument_is_string);
+
+ // ----------- S t a t e -------------
+ // -- x2 : argument converted to string
+ // -- x1 : constructor function
+ // -- lr : return address
+ // -----------------------------------
+
+ Label gc_required;
+ Register new_obj = x0;
+ __ Allocate(JSValue::kSize, new_obj, x10, x11, &gc_required, TAG_OBJECT);
+
+ // Initialize the String object.
+ Register map = x3;
+ __ LoadGlobalFunctionInitialMap(function, map, x10);
+ if (FLAG_debug_code) {
+ __ Ldrb(x4, FieldMemOperand(map, Map::kInstanceSizeOffset));
+ __ Cmp(x4, JSValue::kSize >> kPointerSizeLog2);
+ __ Assert(eq, kUnexpectedStringWrapperInstanceSize);
+ __ Ldrb(x4, FieldMemOperand(map, Map::kUnusedPropertyFieldsOffset));
+ __ Cmp(x4, 0);
+ __ Assert(eq, kUnexpectedUnusedPropertiesOfStringWrapper);
+ }
+ __ Str(map, FieldMemOperand(new_obj, HeapObject::kMapOffset));
+
+ Register empty = x3;
+ __ LoadRoot(empty, Heap::kEmptyFixedArrayRootIndex);
+ __ Str(empty, FieldMemOperand(new_obj, JSObject::kPropertiesOffset));
+ __ Str(empty, FieldMemOperand(new_obj, JSObject::kElementsOffset));
+
+ __ Str(argument, FieldMemOperand(new_obj, JSValue::kValueOffset));
+
+ // Ensure the object is fully initialized.
+ STATIC_ASSERT(JSValue::kSize == (4 * kPointerSize));
+
+ __ Ret();
+
+ // The argument was not found in the number to string cache. Check
+ // if it's a string already before calling the conversion builtin.
+ Label convert_argument;
+ __ Bind(¬_cached);
+ __ JumpIfSmi(arg, &convert_argument);
+
+ // Is it a String?
+ __ Ldr(x10, FieldMemOperand(x0, HeapObject::kMapOffset));
+ __ Ldrb(x11, FieldMemOperand(x10, Map::kInstanceTypeOffset));
+ __ Tbnz(x11, MaskToBit(kIsNotStringMask), &convert_argument);
+ __ Mov(argument, arg);
+ __ IncrementCounter(counters->string_ctor_string_value(), 1, x10, x11);
+ __ B(&argument_is_string);
+
+ // Invoke the conversion builtin and put the result into x2.
+ __ Bind(&convert_argument);
+ __ Push(function); // Preserve the function.
+ __ IncrementCounter(counters->string_ctor_conversions(), 1, x10, x11);
+ {
+ FrameScope scope(masm, StackFrame::INTERNAL);
+ __ Push(arg);
+ __ InvokeBuiltin(Builtins::TO_STRING, CALL_FUNCTION);
+ }
+ __ Pop(function);
+ __ Mov(argument, x0);
+ __ B(&argument_is_string);
+
+ // Load the empty string into x2, remove the receiver from the
+ // stack, and jump back to the case where the argument is a string.
+ __ Bind(&no_arguments);
+ __ LoadRoot(argument, Heap::kempty_stringRootIndex);
+ __ Drop(1);
+ __ B(&argument_is_string);
+
+ // At this point the argument is already a string. Call runtime to create a
+ // string wrapper.
+ __ Bind(&gc_required);
+ __ IncrementCounter(counters->string_ctor_gc_required(), 1, x10, x11);
+ {
+ FrameScope scope(masm, StackFrame::INTERNAL);
+ __ Push(argument);
+ __ CallRuntime(Runtime::kNewStringWrapper, 1);
+ }
+ __ Ret();
+}
+
+
+static void CallRuntimePassFunction(MacroAssembler* masm,
+ Runtime::FunctionId function_id) {
+ FrameScope scope(masm, StackFrame::INTERNAL);
+ // - Push a copy of the function onto the stack.
+ // - Push another copy as a parameter to the runtime call.
+ __ Push(x1, x1);
+
+ __ CallRuntime(function_id, 1);
+
+ // - Restore receiver.
+ __ Pop(x1);
+}
+
+
+static void GenerateTailCallToSharedCode(MacroAssembler* masm) {
+ __ Ldr(x2, FieldMemOperand(x1, JSFunction::kSharedFunctionInfoOffset));
+ __ Ldr(x2, FieldMemOperand(x2, SharedFunctionInfo::kCodeOffset));
+ __ Add(x2, x2, Code::kHeaderSize - kHeapObjectTag);
+ __ Br(x2);
+}
+
+
+static void GenerateTailCallToReturnedCode(MacroAssembler* masm) {
+ __ Add(x0, x0, Code::kHeaderSize - kHeapObjectTag);
+ __ Br(x0);
+}
+
+
+void Builtins::Generate_InOptimizationQueue(MacroAssembler* masm) {
+ // Checking whether the queued function is ready for install is optional,
+ // since we come across interrupts and stack checks elsewhere. However, not
+ // checking may delay installing ready functions, and always checking would be
+ // quite expensive. A good compromise is to first check against stack limit as
+ // a cue for an interrupt signal.
+ Label ok;
+ __ CompareRoot(masm->StackPointer(), Heap::kStackLimitRootIndex);
+ __ B(hs, &ok);
+
+ CallRuntimePassFunction(masm, Runtime::kTryInstallOptimizedCode);
+ GenerateTailCallToReturnedCode(masm);
+
+ __ Bind(&ok);
+ GenerateTailCallToSharedCode(masm);
+}
+
+
+static void Generate_JSConstructStubHelper(MacroAssembler* masm,
+ bool is_api_function,
+ bool create_memento) {
+ // ----------- S t a t e -------------
+ // -- x0 : number of arguments
+ // -- x1 : constructor function
+ // -- x2 : allocation site or undefined
+ // -- lr : return address
+ // -- sp[...]: constructor arguments
+ // -----------------------------------
+
+ ASM_LOCATION("Builtins::Generate_JSConstructStubHelper");
+ // Should never create mementos for api functions.
+ DCHECK(!is_api_function || !create_memento);
+
+ Isolate* isolate = masm->isolate();
+
+ // Enter a construct frame.
+ {
+ FrameScope scope(masm, StackFrame::CONSTRUCT);
+
+ // Preserve the three incoming parameters on the stack.
+ if (create_memento) {
+ __ AssertUndefinedOrAllocationSite(x2, x10);
+ __ Push(x2);
+ }
+
+ Register argc = x0;
+ Register constructor = x1;
+ // x1: constructor function
+ __ SmiTag(argc);
+ __ Push(argc, constructor);
+ // sp[0] : Constructor function.
+ // sp[1]: number of arguments (smi-tagged)
+
+ // Try to allocate the object without transitioning into C code. If any of
+ // the preconditions is not met, the code bails out to the runtime call.
+ Label rt_call, allocated;
+ if (FLAG_inline_new) {
+ Label undo_allocation;
+ ExternalReference debug_step_in_fp =
+ ExternalReference::debug_step_in_fp_address(isolate);
+ __ Mov(x2, Operand(debug_step_in_fp));
+ __ Ldr(x2, MemOperand(x2));
+ __ Cbnz(x2, &rt_call);
+ // Load the initial map and verify that it is in fact a map.
+ Register init_map = x2;
+ __ Ldr(init_map,
+ FieldMemOperand(constructor,
+ JSFunction::kPrototypeOrInitialMapOffset));
+ __ JumpIfSmi(init_map, &rt_call);
+ __ JumpIfNotObjectType(init_map, x10, x11, MAP_TYPE, &rt_call);
+
+ // Check that the constructor is not constructing a JSFunction (see
+ // comments in Runtime_NewObject in runtime.cc). In which case the initial
+ // map's instance type would be JS_FUNCTION_TYPE.
+ __ CompareInstanceType(init_map, x10, JS_FUNCTION_TYPE);
+ __ B(eq, &rt_call);
+
+ Register constructon_count = x14;
+ if (!is_api_function) {
+ Label allocate;
+ MemOperand bit_field3 =
+ FieldMemOperand(init_map, Map::kBitField3Offset);
+ // Check if slack tracking is enabled.
+ __ Ldr(x4, bit_field3);
+ __ DecodeField<Map::ConstructionCount>(constructon_count, x4);
+ __ Cmp(constructon_count, Operand(JSFunction::kNoSlackTracking));
+ __ B(eq, &allocate);
+ // Decrease generous allocation count.
+ __ Subs(x4, x4, Operand(1 << Map::ConstructionCount::kShift));
+ __ Str(x4, bit_field3);
+ __ Cmp(constructon_count, Operand(JSFunction::kFinishSlackTracking));
+ __ B(ne, &allocate);
+
+ // Push the constructor and map to the stack, and the constructor again
+ // as argument to the runtime call.
+ __ Push(constructor, init_map, constructor);
+ __ CallRuntime(Runtime::kFinalizeInstanceSize, 1);
+ __ Pop(init_map, constructor);
+ __ Mov(constructon_count, Operand(JSFunction::kNoSlackTracking));
+ __ Bind(&allocate);
+ }
+
+ // Now allocate the JSObject on the heap.
+ Register obj_size = x3;
+ Register new_obj = x4;
+ __ Ldrb(obj_size, FieldMemOperand(init_map, Map::kInstanceSizeOffset));
+ if (create_memento) {
+ __ Add(x7, obj_size,
+ Operand(AllocationMemento::kSize / kPointerSize));
+ __ Allocate(x7, new_obj, x10, x11, &rt_call, SIZE_IN_WORDS);
+ } else {
+ __ Allocate(obj_size, new_obj, x10, x11, &rt_call, SIZE_IN_WORDS);
+ }
+
+ // Allocated the JSObject, now initialize the fields. Map is set to
+ // initial map and properties and elements are set to empty fixed array.
+ // NB. the object pointer is not tagged, so MemOperand is used.
+ Register empty = x5;
+ __ LoadRoot(empty, Heap::kEmptyFixedArrayRootIndex);
+ __ Str(init_map, MemOperand(new_obj, JSObject::kMapOffset));
+ STATIC_ASSERT(JSObject::kElementsOffset ==
+ (JSObject::kPropertiesOffset + kPointerSize));
+ __ Stp(empty, empty, MemOperand(new_obj, JSObject::kPropertiesOffset));
+
+ Register first_prop = x5;
+ __ Add(first_prop, new_obj, JSObject::kHeaderSize);
+
+ // Fill all of the in-object properties with the appropriate filler.
+ Register filler = x7;
+ __ LoadRoot(filler, Heap::kUndefinedValueRootIndex);
+
+ // Obtain number of pre-allocated property fields and in-object
+ // properties.
+ Register prealloc_fields = x10;
+ Register inobject_props = x11;
+ Register inst_sizes = x11;
+ __ Ldr(inst_sizes, FieldMemOperand(init_map, Map::kInstanceSizesOffset));
+ __ Ubfx(prealloc_fields, inst_sizes,
+ Map::kPreAllocatedPropertyFieldsByte * kBitsPerByte,
+ kBitsPerByte);
+ __ Ubfx(inobject_props, inst_sizes,
+ Map::kInObjectPropertiesByte * kBitsPerByte, kBitsPerByte);
+
+ // Calculate number of property fields in the object.
+ Register prop_fields = x6;
+ __ Sub(prop_fields, obj_size, JSObject::kHeaderSize / kPointerSize);
+
+ if (!is_api_function) {
+ Label no_inobject_slack_tracking;
+
+ // Check if slack tracking is enabled.
+ __ Cmp(constructon_count, Operand(JSFunction::kNoSlackTracking));
+ __ B(eq, &no_inobject_slack_tracking);
+ constructon_count = NoReg;
+
+ // Fill the pre-allocated fields with undef.
+ __ FillFields(first_prop, prealloc_fields, filler);
+
+ // Update first_prop register to be the offset of the first field after
+ // pre-allocated fields.
+ __ Add(first_prop, first_prop,
+ Operand(prealloc_fields, LSL, kPointerSizeLog2));
+
+ if (FLAG_debug_code) {
+ Register obj_end = x14;
+ __ Add(obj_end, new_obj, Operand(obj_size, LSL, kPointerSizeLog2));
+ __ Cmp(first_prop, obj_end);
+ __ Assert(le, kUnexpectedNumberOfPreAllocatedPropertyFields);
+ }
+
+ // Fill the remaining fields with one pointer filler map.
+ __ LoadRoot(filler, Heap::kOnePointerFillerMapRootIndex);
+ __ Sub(prop_fields, prop_fields, prealloc_fields);
+
+ __ bind(&no_inobject_slack_tracking);
+ }
+ if (create_memento) {
+ // Fill the pre-allocated fields with undef.
+ __ FillFields(first_prop, prop_fields, filler);
+ __ Add(first_prop, new_obj, Operand(obj_size, LSL, kPointerSizeLog2));
+ __ LoadRoot(x14, Heap::kAllocationMementoMapRootIndex);
+ DCHECK_EQ(0 * kPointerSize, AllocationMemento::kMapOffset);
+ __ Str(x14, MemOperand(first_prop, kPointerSize, PostIndex));
+ // Load the AllocationSite
+ __ Peek(x14, 2 * kXRegSize);
+ DCHECK_EQ(1 * kPointerSize, AllocationMemento::kAllocationSiteOffset);
+ __ Str(x14, MemOperand(first_prop, kPointerSize, PostIndex));
+ first_prop = NoReg;
+ } else {
+ // Fill all of the property fields with undef.
+ __ FillFields(first_prop, prop_fields, filler);
+ first_prop = NoReg;
+ prop_fields = NoReg;
+ }
+
+ // Add the object tag to make the JSObject real, so that we can continue
+ // and jump into the continuation code at any time from now on. Any
+ // failures need to undo the allocation, so that the heap is in a
+ // consistent state and verifiable.
+ __ Add(new_obj, new_obj, kHeapObjectTag);
+
+ // Check if a non-empty properties array is needed. Continue with
+ // allocated object if not, or fall through to runtime call if it is.
+ Register element_count = x3;
+ __ Ldrb(element_count,
+ FieldMemOperand(init_map, Map::kUnusedPropertyFieldsOffset));
+ // The field instance sizes contains both pre-allocated property fields
+ // and in-object properties.
+ __ Add(element_count, element_count, prealloc_fields);
+ __ Subs(element_count, element_count, inobject_props);
+
+ // Done if no extra properties are to be allocated.
+ __ B(eq, &allocated);
+ __ Assert(pl, kPropertyAllocationCountFailed);
+
+ // Scale the number of elements by pointer size and add the header for
+ // FixedArrays to the start of the next object calculation from above.
+ Register new_array = x5;
+ Register array_size = x6;
+ __ Add(array_size, element_count, FixedArray::kHeaderSize / kPointerSize);
+ __ Allocate(array_size, new_array, x11, x12, &undo_allocation,
+ static_cast<AllocationFlags>(RESULT_CONTAINS_TOP |
+ SIZE_IN_WORDS));
+
+ Register array_map = x10;
+ __ LoadRoot(array_map, Heap::kFixedArrayMapRootIndex);
+ __ Str(array_map, MemOperand(new_array, FixedArray::kMapOffset));
+ __ SmiTag(x0, element_count);
+ __ Str(x0, MemOperand(new_array, FixedArray::kLengthOffset));
+
+ // Initialize the fields to undefined.
+ Register elements = x10;
+ __ Add(elements, new_array, FixedArray::kHeaderSize);
+ __ FillFields(elements, element_count, filler);
+
+ // Store the initialized FixedArray into the properties field of the
+ // JSObject.
+ __ Add(new_array, new_array, kHeapObjectTag);
+ __ Str(new_array, FieldMemOperand(new_obj, JSObject::kPropertiesOffset));
+
+ // Continue with JSObject being successfully allocated.
+ __ B(&allocated);
+
+ // Undo the setting of the new top so that the heap is verifiable. For
+ // example, the map's unused properties potentially do not match the
+ // allocated objects unused properties.
+ __ Bind(&undo_allocation);
+ __ UndoAllocationInNewSpace(new_obj, x14);
+ }
+
+ // Allocate the new receiver object using the runtime call.
+ __ Bind(&rt_call);
+ Label count_incremented;
+ if (create_memento) {
+ // Get the cell or allocation site.
+ __ Peek(x4, 2 * kXRegSize);
+ __ Push(x4);
+ __ Push(constructor); // Argument for Runtime_NewObject.
+ __ CallRuntime(Runtime::kNewObjectWithAllocationSite, 2);
+ __ Mov(x4, x0);
+ // If we ended up using the runtime, and we want a memento, then the
+ // runtime call made it for us, and we shouldn't do create count
+ // increment.
+ __ jmp(&count_incremented);
+ } else {
+ __ Push(constructor); // Argument for Runtime_NewObject.
+ __ CallRuntime(Runtime::kNewObject, 1);
+ __ Mov(x4, x0);
+ }
+
+ // Receiver for constructor call allocated.
+ // x4: JSObject
+ __ Bind(&allocated);
+
+ if (create_memento) {
+ __ Peek(x10, 2 * kXRegSize);
+ __ JumpIfRoot(x10, Heap::kUndefinedValueRootIndex, &count_incremented);
+ // r2 is an AllocationSite. We are creating a memento from it, so we
+ // need to increment the memento create count.
+ __ Ldr(x5, FieldMemOperand(x10,
+ AllocationSite::kPretenureCreateCountOffset));
+ __ Add(x5, x5, Operand(Smi::FromInt(1)));
+ __ Str(x5, FieldMemOperand(x10,
+ AllocationSite::kPretenureCreateCountOffset));
+ __ bind(&count_incremented);
+ }
+
+ __ Push(x4, x4);
+
+ // Reload the number of arguments from the stack.
+ // Set it up in x0 for the function call below.
+ // jssp[0]: receiver
+ // jssp[1]: receiver
+ // jssp[2]: constructor function
+ // jssp[3]: number of arguments (smi-tagged)
+ __ Peek(constructor, 2 * kXRegSize); // Load constructor.
+ __ Peek(argc, 3 * kXRegSize); // Load number of arguments.
+ __ SmiUntag(argc);
+
+ // Set up pointer to last argument.
+ __ Add(x2, fp, StandardFrameConstants::kCallerSPOffset);
+
+ // Copy arguments and receiver to the expression stack.
+ // Copy 2 values every loop to use ldp/stp.
+ // x0: number of arguments
+ // x1: constructor function
+ // x2: address of last argument (caller sp)
+ // jssp[0]: receiver
+ // jssp[1]: receiver
+ // jssp[2]: constructor function
+ // jssp[3]: number of arguments (smi-tagged)
+ // Compute the start address of the copy in x3.
+ __ Add(x3, x2, Operand(argc, LSL, kPointerSizeLog2));
+ Label loop, entry, done_copying_arguments;
+ __ B(&entry);
+ __ Bind(&loop);
+ __ Ldp(x10, x11, MemOperand(x3, -2 * kPointerSize, PreIndex));
+ __ Push(x11, x10);
+ __ Bind(&entry);
+ __ Cmp(x3, x2);
+ __ B(gt, &loop);
+ // Because we copied values 2 by 2 we may have copied one extra value.
+ // Drop it if that is the case.
+ __ B(eq, &done_copying_arguments);
+ __ Drop(1);
+ __ Bind(&done_copying_arguments);
+
+ // Call the function.
+ // x0: number of arguments
+ // x1: constructor function
+ if (is_api_function) {
+ __ Ldr(cp, FieldMemOperand(constructor, JSFunction::kContextOffset));
+ Handle<Code> code =
+ masm->isolate()->builtins()->HandleApiCallConstruct();
+ __ Call(code, RelocInfo::CODE_TARGET);
+ } else {
+ ParameterCount actual(argc);
+ __ InvokeFunction(constructor, actual, CALL_FUNCTION, NullCallWrapper());
+ }
+
+ // Store offset of return address for deoptimizer.
+ if (!is_api_function) {
+ masm->isolate()->heap()->SetConstructStubDeoptPCOffset(masm->pc_offset());
+ }
+
+ // Restore the context from the frame.
+ // x0: result
+ // jssp[0]: receiver
+ // jssp[1]: constructor function
+ // jssp[2]: number of arguments (smi-tagged)
+ __ Ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
+
+ // If the result is an object (in the ECMA sense), we should get rid
+ // of the receiver and use the result; see ECMA-262 section 13.2.2-7
+ // on page 74.
+ Label use_receiver, exit;
+
+ // If the result is a smi, it is *not* an object in the ECMA sense.
+ // x0: result
+ // jssp[0]: receiver (newly allocated object)
+ // jssp[1]: constructor function
+ // jssp[2]: number of arguments (smi-tagged)
+ __ JumpIfSmi(x0, &use_receiver);
+
+ // If the type of the result (stored in its map) is less than
+ // FIRST_SPEC_OBJECT_TYPE, it is not an object in the ECMA sense.
+ __ JumpIfObjectType(x0, x1, x3, FIRST_SPEC_OBJECT_TYPE, &exit, ge);
+
+ // Throw away the result of the constructor invocation and use the
+ // on-stack receiver as the result.
+ __ Bind(&use_receiver);
+ __ Peek(x0, 0);
+
+ // Remove the receiver from the stack, remove caller arguments, and
+ // return.
+ __ Bind(&exit);
+ // x0: result
+ // jssp[0]: receiver (newly allocated object)
+ // jssp[1]: constructor function
+ // jssp[2]: number of arguments (smi-tagged)
+ __ Peek(x1, 2 * kXRegSize);
+
+ // Leave construct frame.
+ }
+
+ __ DropBySMI(x1);
+ __ Drop(1);
+ __ IncrementCounter(isolate->counters()->constructed_objects(), 1, x1, x2);
+ __ Ret();
+}
+
+
+void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
+ Generate_JSConstructStubHelper(masm, false, FLAG_pretenuring_call_new);
+}
+
+
+void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {
+ Generate_JSConstructStubHelper(masm, true, false);
+}
+
+
+// Input:
+// x0: code entry.
+// x1: function.
+// x2: receiver.
+// x3: argc.
+// x4: argv.
+// Output:
+// x0: result.
+static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
+ bool is_construct) {
+ // Called from JSEntryStub::GenerateBody().
+ Register function = x1;
+ Register receiver = x2;
+ Register argc = x3;
+ Register argv = x4;
+
+ ProfileEntryHookStub::MaybeCallEntryHook(masm);
+
+ // Clear the context before we push it when entering the internal frame.
+ __ Mov(cp, 0);
+
+ {
+ // Enter an internal frame.
+ FrameScope scope(masm, StackFrame::INTERNAL);
+
+ // Set up the context from the function argument.
+ __ Ldr(cp, FieldMemOperand(function, JSFunction::kContextOffset));
+
+ __ InitializeRootRegister();
+
+ // Push the function and the receiver onto the stack.
+ __ Push(function, receiver);
+
+ // Copy arguments to the stack in a loop, in reverse order.
+ // x3: argc.
+ // x4: argv.
+ Label loop, entry;
+ // Compute the copy end address.
+ __ Add(x10, argv, Operand(argc, LSL, kPointerSizeLog2));
+
+ __ B(&entry);
+ __ Bind(&loop);
+ __ Ldr(x11, MemOperand(argv, kPointerSize, PostIndex));
+ __ Ldr(x12, MemOperand(x11)); // Dereference the handle.
+ __ Push(x12); // Push the argument.
+ __ Bind(&entry);
+ __ Cmp(x10, argv);
+ __ B(ne, &loop);
+
+ // Initialize all JavaScript callee-saved registers, since they will be seen
+ // by the garbage collector as part of handlers.
+ // The original values have been saved in JSEntryStub::GenerateBody().
+ __ LoadRoot(x19, Heap::kUndefinedValueRootIndex);
+ __ Mov(x20, x19);
+ __ Mov(x21, x19);
+ __ Mov(x22, x19);
+ __ Mov(x23, x19);
+ __ Mov(x24, x19);
+ __ Mov(x25, x19);
+ // Don't initialize the reserved registers.
+ // x26 : root register (root).
+ // x27 : context pointer (cp).
+ // x28 : JS stack pointer (jssp).
+ // x29 : frame pointer (fp).
+
+ __ Mov(x0, argc);
+ if (is_construct) {
+ // No type feedback cell is available.
+ __ LoadRoot(x2, Heap::kUndefinedValueRootIndex);
+
+ CallConstructStub stub(masm->isolate(), NO_CALL_CONSTRUCTOR_FLAGS);
+ __ CallStub(&stub);
+ } else {
+ ParameterCount actual(x0);
+ __ InvokeFunction(function, actual, CALL_FUNCTION, NullCallWrapper());
+ }
+ // Exit the JS internal frame and remove the parameters (except function),
+ // and return.
+ }
+
+ // Result is in x0. Return.
+ __ Ret();
+}
+
+
+void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) {
+ Generate_JSEntryTrampolineHelper(masm, false);
+}
+
+
+void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
+ Generate_JSEntryTrampolineHelper(masm, true);
+}
+
+
+void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
+ CallRuntimePassFunction(masm, Runtime::kCompileLazy);
+ GenerateTailCallToReturnedCode(masm);
+}
+
+
+static void CallCompileOptimized(MacroAssembler* masm, bool concurrent) {
+ FrameScope scope(masm, StackFrame::INTERNAL);
+ Register function = x1;
+
+ // Preserve function. At the same time, push arguments for
+ // kCompileOptimized.
+ __ LoadObject(x10, masm->isolate()->factory()->ToBoolean(concurrent));
+ __ Push(function, function, x10);
+
+ __ CallRuntime(Runtime::kCompileOptimized, 2);
+
+ // Restore receiver.
+ __ Pop(function);
+}
+
+
+void Builtins::Generate_CompileOptimized(MacroAssembler* masm) {
+ CallCompileOptimized(masm, false);
+ GenerateTailCallToReturnedCode(masm);
+}
+
+
+void Builtins::Generate_CompileOptimizedConcurrent(MacroAssembler* masm) {
+ CallCompileOptimized(masm, true);
+ GenerateTailCallToReturnedCode(masm);
+}
+
+
+static void GenerateMakeCodeYoungAgainCommon(MacroAssembler* masm) {
+ // For now, we are relying on the fact that make_code_young doesn't do any
+ // garbage collection which allows us to save/restore the registers without
+ // worrying about which of them contain pointers. We also don't build an
+ // internal frame to make the code fast, since we shouldn't have to do stack
+ // crawls in MakeCodeYoung. This seems a bit fragile.
+
+ // The following caller-saved registers must be saved and restored when
+ // calling through to the runtime:
+ // x0 - The address from which to resume execution.
+ // x1 - isolate
+ // lr - The return address for the JSFunction itself. It has not yet been
+ // preserved on the stack because the frame setup code was replaced
+ // with a call to this stub, to handle code ageing.
+ {
+ FrameScope scope(masm, StackFrame::MANUAL);
+ __ Push(x0, x1, fp, lr);
+ __ Mov(x1, ExternalReference::isolate_address(masm->isolate()));
+ __ CallCFunction(
+ ExternalReference::get_make_code_young_function(masm->isolate()), 2);
+ __ Pop(lr, fp, x1, x0);
+ }
+
+ // The calling function has been made young again, so return to execute the
+ // real frame set-up code.
+ __ Br(x0);
+}
+
+#define DEFINE_CODE_AGE_BUILTIN_GENERATOR(C) \
+void Builtins::Generate_Make##C##CodeYoungAgainEvenMarking( \
+ MacroAssembler* masm) { \
+ GenerateMakeCodeYoungAgainCommon(masm); \
+} \
+void Builtins::Generate_Make##C##CodeYoungAgainOddMarking( \
+ MacroAssembler* masm) { \
+ GenerateMakeCodeYoungAgainCommon(masm); \
+}
+CODE_AGE_LIST(DEFINE_CODE_AGE_BUILTIN_GENERATOR)
+#undef DEFINE_CODE_AGE_BUILTIN_GENERATOR
+
+
+void Builtins::Generate_MarkCodeAsExecutedOnce(MacroAssembler* masm) {
+ // For now, as in GenerateMakeCodeYoungAgainCommon, we are relying on the fact
+ // that make_code_young doesn't do any garbage collection which allows us to
+ // save/restore the registers without worrying about which of them contain
+ // pointers.
+
+ // The following caller-saved registers must be saved and restored when
+ // calling through to the runtime:
+ // x0 - The address from which to resume execution.
+ // x1 - isolate
+ // lr - The return address for the JSFunction itself. It has not yet been
+ // preserved on the stack because the frame setup code was replaced
+ // with a call to this stub, to handle code ageing.
+ {
+ FrameScope scope(masm, StackFrame::MANUAL);
+ __ Push(x0, x1, fp, lr);
+ __ Mov(x1, ExternalReference::isolate_address(masm->isolate()));
+ __ CallCFunction(
+ ExternalReference::get_mark_code_as_executed_function(
+ masm->isolate()), 2);
+ __ Pop(lr, fp, x1, x0);
+
+ // Perform prologue operations usually performed by the young code stub.
+ __ EmitFrameSetupForCodeAgePatching(masm);
+ }
+
+ // Jump to point after the code-age stub.
+ __ Add(x0, x0, kNoCodeAgeSequenceLength);
+ __ Br(x0);
+}
+
+
+void Builtins::Generate_MarkCodeAsExecutedTwice(MacroAssembler* masm) {
+ GenerateMakeCodeYoungAgainCommon(masm);
+}
+
+
+static void Generate_NotifyStubFailureHelper(MacroAssembler* masm,
+ SaveFPRegsMode save_doubles) {
+ {
+ FrameScope scope(masm, StackFrame::INTERNAL);
+
+ // Preserve registers across notification, this is important for compiled
+ // stubs that tail call the runtime on deopts passing their parameters in
+ // registers.
+ // TODO(jbramley): Is it correct (and appropriate) to use safepoint
+ // registers here? According to the comment above, we should only need to
+ // preserve the registers with parameters.
+ __ PushXRegList(kSafepointSavedRegisters);
+ // Pass the function and deoptimization type to the runtime system.
+ __ CallRuntime(Runtime::kNotifyStubFailure, 0, save_doubles);
+ __ PopXRegList(kSafepointSavedRegisters);
+ }
+
+ // Ignore state (pushed by Deoptimizer::EntryGenerator::Generate).
+ __ Drop(1);
+
+ // Jump to the miss handler. Deoptimizer::EntryGenerator::Generate loads this
+ // into lr before it jumps here.
+ __ Br(lr);
+}
+
+
+void Builtins::Generate_NotifyStubFailure(MacroAssembler* masm) {
+ Generate_NotifyStubFailureHelper(masm, kDontSaveFPRegs);
+}
+
+
+void Builtins::Generate_NotifyStubFailureSaveDoubles(MacroAssembler* masm) {
+ Generate_NotifyStubFailureHelper(masm, kSaveFPRegs);
+}
+
+
+static void Generate_NotifyDeoptimizedHelper(MacroAssembler* masm,
+ Deoptimizer::BailoutType type) {
+ {
+ FrameScope scope(masm, StackFrame::INTERNAL);
+ // Pass the deoptimization type to the runtime system.
+ __ Mov(x0, Smi::FromInt(static_cast<int>(type)));
+ __ Push(x0);
+ __ CallRuntime(Runtime::kNotifyDeoptimized, 1);
+ }
+
+ // Get the full codegen state from the stack and untag it.
+ Register state = x6;
+ __ Peek(state, 0);
+ __ SmiUntag(state);
+
+ // Switch on the state.
+ Label with_tos_register, unknown_state;
+ __ CompareAndBranch(
+ state, FullCodeGenerator::NO_REGISTERS, ne, &with_tos_register);
+ __ Drop(1); // Remove state.
+ __ Ret();
+
+ __ Bind(&with_tos_register);
+ // Reload TOS register.
+ __ Peek(x0, kPointerSize);
+ __ CompareAndBranch(state, FullCodeGenerator::TOS_REG, ne, &unknown_state);
+ __ Drop(2); // Remove state and TOS.
+ __ Ret();
+
+ __ Bind(&unknown_state);
+ __ Abort(kInvalidFullCodegenState);
+}
+
+
+void Builtins::Generate_NotifyDeoptimized(MacroAssembler* masm) {
+ Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::EAGER);
+}
+
+
+void Builtins::Generate_NotifyLazyDeoptimized(MacroAssembler* masm) {
+ Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::LAZY);
+}
+
+
+void Builtins::Generate_NotifySoftDeoptimized(MacroAssembler* masm) {
+ Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::SOFT);
+}
+
+
+void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
+ // Lookup the function in the JavaScript frame.
+ __ Ldr(x0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+ {
+ FrameScope scope(masm, StackFrame::INTERNAL);
+ // Pass function as argument.
+ __ Push(x0);
+ __ CallRuntime(Runtime::kCompileForOnStackReplacement, 1);
+ }
+
+ // If the code object is null, just return to the unoptimized code.
+ Label skip;
+ __ CompareAndBranch(x0, Smi::FromInt(0), ne, &skip);
+ __ Ret();
+
+ __ Bind(&skip);
+
+ // Load deoptimization data from the code object.
+ // <deopt_data> = <code>[#deoptimization_data_offset]
+ __ Ldr(x1, MemOperand(x0, Code::kDeoptimizationDataOffset - kHeapObjectTag));
+
+ // Load the OSR entrypoint offset from the deoptimization data.
+ // <osr_offset> = <deopt_data>[#header_size + #osr_pc_offset]
+ __ Ldrsw(w1, UntagSmiFieldMemOperand(x1, FixedArray::OffsetOfElementAt(
+ DeoptimizationInputData::kOsrPcOffsetIndex)));
+
+ // Compute the target address = code_obj + header_size + osr_offset
+ // <entry_addr> = <code_obj> + #header_size + <osr_offset>
+ __ Add(x0, x0, x1);
+ __ Add(lr, x0, Code::kHeaderSize - kHeapObjectTag);
+
+ // And "return" to the OSR entry point of the function.
+ __ Ret();
+}
+
+
+void Builtins::Generate_OsrAfterStackCheck(MacroAssembler* masm) {
+ // We check the stack limit as indicator that recompilation might be done.
+ Label ok;
+ __ CompareRoot(jssp, Heap::kStackLimitRootIndex);
+ __ B(hs, &ok);
+ {
+ FrameScope scope(masm, StackFrame::INTERNAL);
+ __ CallRuntime(Runtime::kStackGuard, 0);
+ }
+ __ Jump(masm->isolate()->builtins()->OnStackReplacement(),
+ RelocInfo::CODE_TARGET);
+
+ __ Bind(&ok);
+ __ Ret();
+}
+
+
+void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
+ enum {
+ call_type_JS_func = 0,
+ call_type_func_proxy = 1,
+ call_type_non_func = 2
+ };
+ Register argc = x0;
+ Register function = x1;
+ Register call_type = x4;
+ Register scratch1 = x10;
+ Register scratch2 = x11;
+ Register receiver_type = x13;
+
+ ASM_LOCATION("Builtins::Generate_FunctionCall");
+ // 1. Make sure we have at least one argument.
+ { Label done;
+ __ Cbnz(argc, &done);
+ __ LoadRoot(scratch1, Heap::kUndefinedValueRootIndex);
+ __ Push(scratch1);
+ __ Mov(argc, 1);
+ __ Bind(&done);
+ }
+
+ // 2. Get the function to call (passed as receiver) from the stack, check
+ // if it is a function.
+ Label slow, non_function;
+ __ Peek(function, Operand(argc, LSL, kXRegSizeLog2));
+ __ JumpIfSmi(function, &non_function);
+ __ JumpIfNotObjectType(function, scratch1, receiver_type,
+ JS_FUNCTION_TYPE, &slow);
+
+ // 3a. Patch the first argument if necessary when calling a function.
+ Label shift_arguments;
+ __ Mov(call_type, static_cast<int>(call_type_JS_func));
+ { Label convert_to_object, use_global_proxy, patch_receiver;
+ // Change context eagerly in case we need the global receiver.
+ __ Ldr(cp, FieldMemOperand(function, JSFunction::kContextOffset));
+
+ // Do not transform the receiver for strict mode functions.
+ // Also do not transform the receiver for native (Compilerhints already in
+ // x3).
+ __ Ldr(scratch1,
+ FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
+ __ Ldr(scratch2.W(),
+ FieldMemOperand(scratch1, SharedFunctionInfo::kCompilerHintsOffset));
+ __ TestAndBranchIfAnySet(
+ scratch2.W(),
+ (1 << SharedFunctionInfo::kStrictModeFunction) |
+ (1 << SharedFunctionInfo::kNative),
+ &shift_arguments);
+
+ // Compute the receiver in sloppy mode.
+ Register receiver = x2;
+ __ Sub(scratch1, argc, 1);
+ __ Peek(receiver, Operand(scratch1, LSL, kXRegSizeLog2));
+ __ JumpIfSmi(receiver, &convert_to_object);
+
+ __ JumpIfRoot(receiver, Heap::kUndefinedValueRootIndex,
+ &use_global_proxy);
+ __ JumpIfRoot(receiver, Heap::kNullValueRootIndex, &use_global_proxy);
+
+ STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
+ __ JumpIfObjectType(receiver, scratch1, scratch2,
+ FIRST_SPEC_OBJECT_TYPE, &shift_arguments, ge);
+
+ __ Bind(&convert_to_object);
+
+ {
+ // Enter an internal frame in order to preserve argument count.
+ FrameScope scope(masm, StackFrame::INTERNAL);
+ __ SmiTag(argc);
+
+ __ Push(argc, receiver);
+ __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+ __ Mov(receiver, x0);
+
+ __ Pop(argc);
+ __ SmiUntag(argc);
+
+ // Exit the internal frame.
+ }
+
+ // Restore the function and flag in the registers.
+ __ Peek(function, Operand(argc, LSL, kXRegSizeLog2));
+ __ Mov(call_type, static_cast<int>(call_type_JS_func));
+ __ B(&patch_receiver);
+
+ __ Bind(&use_global_proxy);
+ __ Ldr(receiver, GlobalObjectMemOperand());
+ __ Ldr(receiver,
+ FieldMemOperand(receiver, GlobalObject::kGlobalProxyOffset));
+
+
+ __ Bind(&patch_receiver);
+ __ Sub(scratch1, argc, 1);
+ __ Poke(receiver, Operand(scratch1, LSL, kXRegSizeLog2));
+
+ __ B(&shift_arguments);
+ }
+
+ // 3b. Check for function proxy.
+ __ Bind(&slow);
+ __ Mov(call_type, static_cast<int>(call_type_func_proxy));
+ __ Cmp(receiver_type, JS_FUNCTION_PROXY_TYPE);
+ __ B(eq, &shift_arguments);
+ __ Bind(&non_function);
+ __ Mov(call_type, static_cast<int>(call_type_non_func));
+
+ // 3c. Patch the first argument when calling a non-function. The
+ // CALL_NON_FUNCTION builtin expects the non-function callee as
+ // receiver, so overwrite the first argument which will ultimately
+ // become the receiver.
+ // call type (0: JS function, 1: function proxy, 2: non-function)
+ __ Sub(scratch1, argc, 1);
+ __ Poke(function, Operand(scratch1, LSL, kXRegSizeLog2));
+
+ // 4. Shift arguments and return address one slot down on the stack
+ // (overwriting the original receiver). Adjust argument count to make
+ // the original first argument the new receiver.
+ // call type (0: JS function, 1: function proxy, 2: non-function)
+ __ Bind(&shift_arguments);
+ { Label loop;
+ // Calculate the copy start address (destination). Copy end address is jssp.
+ __ Add(scratch2, jssp, Operand(argc, LSL, kPointerSizeLog2));
+ __ Sub(scratch1, scratch2, kPointerSize);
+
+ __ Bind(&loop);
+ __ Ldr(x12, MemOperand(scratch1, -kPointerSize, PostIndex));
+ __ Str(x12, MemOperand(scratch2, -kPointerSize, PostIndex));
+ __ Cmp(scratch1, jssp);
+ __ B(ge, &loop);
+ // Adjust the actual number of arguments and remove the top element
+ // (which is a copy of the last argument).
+ __ Sub(argc, argc, 1);
+ __ Drop(1);
+ }
+
+ // 5a. Call non-function via tail call to CALL_NON_FUNCTION builtin,
+ // or a function proxy via CALL_FUNCTION_PROXY.
+ // call type (0: JS function, 1: function proxy, 2: non-function)
+ { Label js_function, non_proxy;
+ __ Cbz(call_type, &js_function);
+ // Expected number of arguments is 0 for CALL_NON_FUNCTION.
+ __ Mov(x2, 0);
+ __ Cmp(call_type, static_cast<int>(call_type_func_proxy));
+ __ B(ne, &non_proxy);
+
+ __ Push(function); // Re-add proxy object as additional argument.
+ __ Add(argc, argc, 1);
+ __ GetBuiltinFunction(function, Builtins::CALL_FUNCTION_PROXY);
+ __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
+ RelocInfo::CODE_TARGET);
+
+ __ Bind(&non_proxy);
+ __ GetBuiltinFunction(function, Builtins::CALL_NON_FUNCTION);
+ __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
+ RelocInfo::CODE_TARGET);
+ __ Bind(&js_function);
+ }
+
+ // 5b. Get the code to call from the function and check that the number of
+ // expected arguments matches what we're providing. If so, jump
+ // (tail-call) to the code in register edx without checking arguments.
+ __ Ldr(x3, FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
+ __ Ldrsw(x2,
+ FieldMemOperand(x3,
+ SharedFunctionInfo::kFormalParameterCountOffset));
+ Label dont_adapt_args;
+ __ Cmp(x2, argc); // Check formal and actual parameter counts.
+ __ B(eq, &dont_adapt_args);
+ __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
+ RelocInfo::CODE_TARGET);
+ __ Bind(&dont_adapt_args);
+
+ __ Ldr(x3, FieldMemOperand(function, JSFunction::kCodeEntryOffset));
+ ParameterCount expected(0);
+ __ InvokeCode(x3, expected, expected, JUMP_FUNCTION, NullCallWrapper());
+}
+
+
+void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
+ ASM_LOCATION("Builtins::Generate_FunctionApply");
+ const int kIndexOffset =
+ StandardFrameConstants::kExpressionsOffset - (2 * kPointerSize);
+ const int kLimitOffset =
+ StandardFrameConstants::kExpressionsOffset - (1 * kPointerSize);
+ const int kArgsOffset = 2 * kPointerSize;
+ const int kReceiverOffset = 3 * kPointerSize;
+ const int kFunctionOffset = 4 * kPointerSize;
+
+ {
+ FrameScope frame_scope(masm, StackFrame::INTERNAL);
+
+ Register args = x12;
+ Register receiver = x14;
+ Register function = x15;
+
+ // Get the length of the arguments via a builtin call.
+ __ Ldr(function, MemOperand(fp, kFunctionOffset));
+ __ Ldr(args, MemOperand(fp, kArgsOffset));
+ __ Push(function, args);
+ __ InvokeBuiltin(Builtins::APPLY_PREPARE, CALL_FUNCTION);
+ Register argc = x0;
+
+ // Check the stack for overflow.
+ // We are not trying to catch interruptions (e.g. debug break and
+ // preemption) here, so the "real stack limit" is checked.
+ Label enough_stack_space;
+ __ LoadRoot(x10, Heap::kRealStackLimitRootIndex);
+ __ Ldr(function, MemOperand(fp, kFunctionOffset));
+ // Make x10 the space we have left. The stack might already be overflowed
+ // here which will cause x10 to become negative.
+ // TODO(jbramley): Check that the stack usage here is safe.
+ __ Sub(x10, jssp, x10);
+ // Check if the arguments will overflow the stack.
+ __ Cmp(x10, Operand::UntagSmiAndScale(argc, kPointerSizeLog2));
+ __ B(gt, &enough_stack_space);
+ // There is not enough stack space, so use a builtin to throw an appropriate
+ // error.
+ __ Push(function, argc);
+ __ InvokeBuiltin(Builtins::STACK_OVERFLOW, CALL_FUNCTION);
+ // We should never return from the APPLY_OVERFLOW builtin.
+ if (__ emit_debug_code()) {
+ __ Unreachable();
+ }
+
+ __ Bind(&enough_stack_space);
+ // Push current limit and index.
+ __ Mov(x1, 0); // Initial index.
+ __ Push(argc, x1);
+
+ Label push_receiver;
+ __ Ldr(receiver, MemOperand(fp, kReceiverOffset));
+
+ // Check that the function is a JS function. Otherwise it must be a proxy.
+ // When it is not the function proxy will be invoked later.
+ __ JumpIfNotObjectType(function, x10, x11, JS_FUNCTION_TYPE,
+ &push_receiver);
+
+ // Change context eagerly to get the right global object if necessary.
+ __ Ldr(cp, FieldMemOperand(function, JSFunction::kContextOffset));
+ // Load the shared function info.
+ __ Ldr(x2, FieldMemOperand(function,
+ JSFunction::kSharedFunctionInfoOffset));
+
+ // Compute and push the receiver.
+ // Do not transform the receiver for strict mode functions.
+ Label convert_receiver_to_object, use_global_proxy;
+ __ Ldr(w10, FieldMemOperand(x2, SharedFunctionInfo::kCompilerHintsOffset));
+ __ Tbnz(x10, SharedFunctionInfo::kStrictModeFunction, &push_receiver);
+ // Do not transform the receiver for native functions.
+ __ Tbnz(x10, SharedFunctionInfo::kNative, &push_receiver);
+
+ // Compute the receiver in sloppy mode.
+ __ JumpIfSmi(receiver, &convert_receiver_to_object);
+ __ JumpIfRoot(receiver, Heap::kNullValueRootIndex, &use_global_proxy);
+ __ JumpIfRoot(receiver, Heap::kUndefinedValueRootIndex,
+ &use_global_proxy);
+
+ // Check if the receiver is already a JavaScript object.
+ STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
+ __ JumpIfObjectType(receiver, x10, x11, FIRST_SPEC_OBJECT_TYPE,
+ &push_receiver, ge);
+
+ // Call a builtin to convert the receiver to a regular object.
+ __ Bind(&convert_receiver_to_object);
+ __ Push(receiver);
+ __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+ __ Mov(receiver, x0);
+ __ B(&push_receiver);
+
+ __ Bind(&use_global_proxy);
+ __ Ldr(x10, GlobalObjectMemOperand());
+ __ Ldr(receiver, FieldMemOperand(x10, GlobalObject::kGlobalProxyOffset));
+
+ // Push the receiver
+ __ Bind(&push_receiver);
+ __ Push(receiver);
+
+ // Copy all arguments from the array to the stack.
+ Label entry, loop;
+ Register current = x0;
+ __ Ldr(current, MemOperand(fp, kIndexOffset));
+ __ B(&entry);
+
+ __ Bind(&loop);
+ // Load the current argument from the arguments array and push it.
+ // TODO(all): Couldn't we optimize this for JS arrays?
+
+ __ Ldr(x1, MemOperand(fp, kArgsOffset));
+ __ Push(x1, current);
+
+ // Call the runtime to access the property in the arguments array.
+ __ CallRuntime(Runtime::kGetProperty, 2);
+ __ Push(x0);
+
+ // Use inline caching to access the arguments.
+ __ Ldr(current, MemOperand(fp, kIndexOffset));
+ __ Add(current, current, Smi::FromInt(1));
+ __ Str(current, MemOperand(fp, kIndexOffset));
+
+ // Test if the copy loop has finished copying all the elements from the
+ // arguments object.
+ __ Bind(&entry);
+ __ Ldr(x1, MemOperand(fp, kLimitOffset));
+ __ Cmp(current, x1);
+ __ B(ne, &loop);
+
+ // At the end of the loop, the number of arguments is stored in 'current',
+ // represented as a smi.
+
+ function = x1; // From now on we want the function to be kept in x1;
+ __ Ldr(function, MemOperand(fp, kFunctionOffset));
+
+ // Call the function.
+ Label call_proxy;
+ ParameterCount actual(current);
+ __ SmiUntag(current);
+ __ JumpIfNotObjectType(function, x10, x11, JS_FUNCTION_TYPE, &call_proxy);
+ __ InvokeFunction(function, actual, CALL_FUNCTION, NullCallWrapper());
+ frame_scope.GenerateLeaveFrame();
+ __ Drop(3);
+ __ Ret();
+
+ // Call the function proxy.
+ __ Bind(&call_proxy);
+ // x0 : argc
+ // x1 : function
+ __ Push(function); // Add function proxy as last argument.
+ __ Add(x0, x0, 1);
+ __ Mov(x2, 0);
+ __ GetBuiltinFunction(x1, Builtins::CALL_FUNCTION_PROXY);
+ __ Call(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
+ RelocInfo::CODE_TARGET);
+ }
+ __ Drop(3);
+ __ Ret();
+}
+
+
+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
+ // -----------------------------------
+ // Check the stack for overflow.
+ // We are not trying to catch interruptions (e.g. debug break and
+ // preemption) here, so the "real stack limit" is checked.
+ Label enough_stack_space;
+ __ 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(le, stack_overflow);
+}
+
+
+static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) {
+ __ SmiTag(x10, x0);
+ __ Mov(x11, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
+ __ Push(lr, fp);
+ __ Push(x11, x1, x10);
+ __ Add(fp, jssp,
+ StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize);
+}
+
+
+static void LeaveArgumentsAdaptorFrame(MacroAssembler* masm) {
+ // ----------- S t a t e -------------
+ // -- x0 : result being passed through
+ // -----------------------------------
+ // Get the number of arguments passed (as a smi), tear down the frame and
+ // then drop the parameters and the receiver.
+ __ Ldr(x10, MemOperand(fp, -(StandardFrameConstants::kFixedFrameSizeFromFp +
+ kPointerSize)));
+ __ Mov(jssp, fp);
+ __ Pop(fp, lr);
+ __ DropBySMI(x10, kXRegSize);
+ __ Drop(1);
+}
+
+
+void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
+ ASM_LOCATION("Builtins::Generate_ArgumentsAdaptorTrampoline");
+ // ----------- S t a t e -------------
+ // -- x0 : actual number of arguments
+ // -- x1 : function (passed through to callee)
+ // -- x2 : expected number of arguments
+ // -----------------------------------
+
+ Label stack_overflow;
+ ArgumentAdaptorStackCheck(masm, &stack_overflow);
+
+ Register argc_actual = x0; // Excluding the receiver.
+ Register argc_expected = x2; // Excluding the receiver.
+ Register function = x1;
+ Register code_entry = x3;
+
+ Label invoke, dont_adapt_arguments;
+
+ Label enough, too_few;
+ __ Ldr(code_entry, FieldMemOperand(function, JSFunction::kCodeEntryOffset));
+ __ Cmp(argc_actual, argc_expected);
+ __ B(lt, &too_few);
+ __ Cmp(argc_expected, SharedFunctionInfo::kDontAdaptArgumentsSentinel);
+ __ B(eq, &dont_adapt_arguments);
+
+ { // Enough parameters: actual >= expected
+ EnterArgumentsAdaptorFrame(masm);
+
+ Register copy_start = x10;
+ Register copy_end = x11;
+ Register copy_to = x12;
+ Register scratch1 = x13, scratch2 = x14;
+
+ __ Lsl(argc_expected, argc_expected, kPointerSizeLog2);
+
+ // Adjust for fp, lr, and the receiver.
+ __ Add(copy_start, fp, 3 * kPointerSize);
+ __ Add(copy_start, copy_start, Operand(argc_actual, LSL, kPointerSizeLog2));
+ __ Sub(copy_end, copy_start, argc_expected);
+ __ Sub(copy_end, copy_end, kPointerSize);
+ __ Mov(copy_to, jssp);
+
+ // Claim space for the arguments, the receiver, and one extra slot.
+ // The extra slot ensures we do not write under jssp. It will be popped
+ // later.
+ __ Add(scratch1, argc_expected, 2 * kPointerSize);
+ __ Claim(scratch1, 1);
+
+ // Copy the arguments (including the receiver) to the new stack frame.
+ Label copy_2_by_2;
+ __ Bind(©_2_by_2);
+ __ Ldp(scratch1, scratch2,
+ MemOperand(copy_start, - 2 * kPointerSize, PreIndex));
+ __ Stp(scratch1, scratch2,
+ MemOperand(copy_to, - 2 * kPointerSize, PreIndex));
+ __ Cmp(copy_start, copy_end);
+ __ B(hi, ©_2_by_2);
+
+ // Correct the space allocated for the extra slot.
+ __ Drop(1);
+
+ __ B(&invoke);
+ }
+
+ { // Too few parameters: Actual < expected
+ __ Bind(&too_few);
+ EnterArgumentsAdaptorFrame(masm);
+
+ Register copy_from = x10;
+ Register copy_end = x11;
+ Register copy_to = x12;
+ Register scratch1 = x13, scratch2 = x14;
+
+ __ Lsl(argc_expected, argc_expected, kPointerSizeLog2);
+ __ Lsl(argc_actual, argc_actual, kPointerSizeLog2);
+
+ // Adjust for fp, lr, and the receiver.
+ __ Add(copy_from, fp, 3 * kPointerSize);
+ __ Add(copy_from, copy_from, argc_actual);
+ __ Mov(copy_to, jssp);
+ __ Sub(copy_end, copy_to, 1 * kPointerSize); // Adjust for the receiver.
+ __ Sub(copy_end, copy_end, argc_actual);
+
+ // Claim space for the arguments, the receiver, and one extra slot.
+ // The extra slot ensures we do not write under jssp. It will be popped
+ // later.
+ __ Add(scratch1, argc_expected, 2 * kPointerSize);
+ __ Claim(scratch1, 1);
+
+ // Copy the arguments (including the receiver) to the new stack frame.
+ Label copy_2_by_2;
+ __ Bind(©_2_by_2);
+ __ Ldp(scratch1, scratch2,
+ MemOperand(copy_from, - 2 * kPointerSize, PreIndex));
+ __ Stp(scratch1, scratch2,
+ MemOperand(copy_to, - 2 * kPointerSize, PreIndex));
+ __ Cmp(copy_to, copy_end);
+ __ B(hi, ©_2_by_2);
+
+ __ Mov(copy_to, copy_end);
+
+ // Fill the remaining expected arguments with undefined.
+ __ LoadRoot(scratch1, Heap::kUndefinedValueRootIndex);
+ __ Add(copy_end, jssp, kPointerSize);
+
+ Label fill;
+ __ Bind(&fill);
+ __ Stp(scratch1, scratch1,
+ MemOperand(copy_to, - 2 * kPointerSize, PreIndex));
+ __ Cmp(copy_to, copy_end);
+ __ B(hi, &fill);
+
+ // Correct the space allocated for the extra slot.
+ __ Drop(1);
+ }
+
+ // Arguments have been adapted. Now call the entry point.
+ __ Bind(&invoke);
+ __ Call(code_entry);
+
+ // Store offset of return address for deoptimizer.
+ masm->isolate()->heap()->SetArgumentsAdaptorDeoptPCOffset(masm->pc_offset());
+
+ // Exit frame and return.
+ LeaveArgumentsAdaptorFrame(masm);
+ __ Ret();
+
+ // Call the entry point without adapting the arguments.
+ __ Bind(&dont_adapt_arguments);
+ __ Jump(code_entry);
+
+ __ Bind(&stack_overflow);
+ {
+ FrameScope frame(masm, StackFrame::MANUAL);
+ EnterArgumentsAdaptorFrame(masm);
+ __ InvokeBuiltin(Builtins::STACK_OVERFLOW, CALL_FUNCTION);
+ __ Unreachable();
+ }
+}
+
+
+#undef __
+
+} } // namespace v8::internal
+
+#endif // V8_TARGET_ARCH_ARM