Google Git
Sign in
chromium / v8 / v8 / b4a2f656242c60e9c702f6f87c423e9af8af304e / . / src / arm64 / builtins-arm64.cc
blob: 433119801761b43f02cfb997a2268249e4284262 [file] [log] [blame]
// 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"
#include "src/full-codegen/full-codegen.h"
#include "src/runtime/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)
// -- sp[0] : last argument
// -- ...
// -- sp[4 * (argc - 1)] : first argument (argc == x0)
// -- sp[4 * argc] : receiver
// -----------------------------------
__ AssertFunction(x1);
// Make sure we operate in the context of the called function (for example
// ConstructStubs implemented in C++ will be run in the context of the caller
// instead of the callee, due to the way that [[Construct]] is defined for
// ordinary functions).
// TODO(bmeurer): Can we make this more robust?
__ Ldr(cp, FieldMemOperand(x1, JSFunction::kContextOffset));
// 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);
__ Mov(x3, x1);
ArrayConstructorStub stub(masm->isolate());
__ TailCallStub(&stub);
}
// static
void Builtins::Generate_StringConstructor(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_StringConstructor");
// 1. Load the first argument into x0 and get rid of the rest (including the
// receiver).
Label no_arguments;
{
__ Cbz(x0, &no_arguments);
__ Sub(x0, x0, 1);
__ Drop(x0);
__ Ldr(x0, MemOperand(jssp, 2 * kPointerSize, PostIndex));
}
// 2a. At least one argument, return x0 if it's a string, otherwise
// dispatch to appropriate conversion.
Label to_string, symbol_descriptive_string;
{
__ JumpIfSmi(x0, &to_string);
STATIC_ASSERT(FIRST_NONSTRING_TYPE == SYMBOL_TYPE);
__ CompareObjectType(x0, x1, x1, FIRST_NONSTRING_TYPE);
__ B(hi, &to_string);
__ B(eq, &symbol_descriptive_string);
__ Ret();
}
// 2b. No arguments, return the empty string (and pop the receiver).
__ Bind(&no_arguments);
{
__ LoadRoot(x0, Heap::kempty_stringRootIndex);
__ Drop(1);
__ Ret();
}
// 3a. Convert x0 to a string.
__ Bind(&to_string);
{
ToStringStub stub(masm->isolate());
__ TailCallStub(&stub);
}
// 3b. Convert symbol in x0 to a string.
__ Bind(&symbol_descriptive_string);
{
__ Push(x0);
__ TailCallRuntime(Runtime::kSymbolDescriptiveString, 1, 1);
}
}
// static
void Builtins::Generate_StringConstructor_ConstructStub(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_StringConstructor_ConstructStub");
// 1. Load the first argument into x2 and get rid of the rest (including the
// receiver).
{
Label no_arguments, done;
__ Cbz(x0, &no_arguments);
__ Sub(x0, x0, 1);
__ Drop(x0);
__ Ldr(x2, MemOperand(jssp, 2 * kPointerSize, PostIndex));
__ B(&done);
__ Bind(&no_arguments);
__ Drop(1);
__ LoadRoot(x2, Heap::kempty_stringRootIndex);
__ Bind(&done);
}
// 2. Make sure x2 is a string.
{
Label convert, done_convert;
__ JumpIfSmi(x2, &convert);
__ JumpIfObjectType(x2, x3, x3, FIRST_NONSTRING_TYPE, &done_convert, lo);
__ Bind(&convert);
{
FrameScope scope(masm, StackFrame::INTERNAL);
ToStringStub stub(masm->isolate());
__ Push(x1);
__ Move(x0, x2);
__ CallStub(&stub);
__ Move(x2, x0);
__ Pop(x1);
}
__ Bind(&done_convert);
}
// 3. Allocate a JSValue wrapper for the string.
{
// ----------- S t a t e -------------
// -- x1 : constructor function
// -- x2 : the first argument
// -- lr : return address
// -----------------------------------
Label allocate, done_allocate;
__ Allocate(JSValue::kSize, x0, x3, x4, &allocate, TAG_OBJECT);
__ Bind(&done_allocate);
// Initialize the JSValue in eax.
__ LoadGlobalFunctionInitialMap(x1, x3, x4);
__ Str(x3, FieldMemOperand(x0, HeapObject::kMapOffset));
__ LoadRoot(x3, Heap::kEmptyFixedArrayRootIndex);
__ Str(x3, FieldMemOperand(x0, JSObject::kPropertiesOffset));
__ Str(x3, FieldMemOperand(x0, JSObject::kElementsOffset));
__ Str(x2, FieldMemOperand(x0, JSValue::kValueOffset));
STATIC_ASSERT(JSValue::kSize == 4 * kPointerSize);
__ Ret();
// Fallback to the runtime to allocate in new space.
__ Bind(&allocate);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(x1, x2);
__ Push(Smi::FromInt(JSValue::kSize));
__ CallRuntime(Runtime::kAllocateInNewSpace, 1);
__ Pop(x2, x1);
}
__ B(&done_allocate);
}
}
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) {
// ----------- S t a t e -------------
// -- x0 : number of arguments
// -- x1 : constructor function
// -- x2 : allocation site or undefined
// -- x3 : original constructor
// -- lr : return address
// -- sp[...]: constructor arguments
// -----------------------------------
ASM_LOCATION("Builtins::Generate_JSConstructStubHelper");
Isolate* isolate = masm->isolate();
// Enter a construct frame.
{
FrameScope scope(masm, StackFrame::CONSTRUCT);
// Preserve the four incoming parameters on the stack.
Register argc = x0;
Register constructor = x1;
Register allocation_site = x2;
Register original_constructor = x3;
// Preserve the incoming parameters on the stack.
__ AssertUndefinedOrAllocationSite(allocation_site, x10);
__ SmiTag(argc);
__ Push(allocation_site, argc, constructor, original_constructor);
// sp[0]: new.target
// sp[1]: Constructor function.
// sp[2]: number of arguments (smi-tagged)
// sp[3]: allocation site
// 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) {
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);
// Fall back to runtime if the original constructor and function differ.
__ Cmp(constructor, original_constructor);
__ B(ne, &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::Counter>(constructon_count, x4);
__ Cmp(constructon_count, Operand(Map::kSlackTrackingCounterEnd));
__ B(lt, &allocate);
// Decrease generous allocation count.
__ Subs(x4, x4, Operand(1 << Map::Counter::kShift));
__ Str(x4, bit_field3);
__ Cmp(constructon_count, Operand(Map::kSlackTrackingCounterEnd));
__ 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(Map::kSlackTrackingCounterEnd - 1));
__ Bind(&allocate);
}
// Now allocate the JSObject on the heap.
Label rt_call_reload_new_target;
Register obj_size = x3;
Register new_obj = x4;
__ Ldrb(obj_size, FieldMemOperand(init_map, Map::kInstanceSizeOffset));
__ Allocate(obj_size, new_obj, x10, x11, &rt_call_reload_new_target,
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 unused_props = x10;
Register inobject_props = x11;
Register inst_sizes_or_attrs = x11;
Register prealloc_fields = x10;
__ Ldr(inst_sizes_or_attrs,
FieldMemOperand(init_map, Map::kInstanceAttributesOffset));
__ Ubfx(unused_props, inst_sizes_or_attrs,
Map::kUnusedPropertyFieldsByte * kBitsPerByte, kBitsPerByte);
__ Ldr(inst_sizes_or_attrs,
FieldMemOperand(init_map, Map::kInstanceSizesOffset));
__ Ubfx(
inobject_props, inst_sizes_or_attrs,
Map::kInObjectPropertiesOrConstructorFunctionIndexByte * kBitsPerByte,
kBitsPerByte);
__ Sub(prealloc_fields, inobject_props, unused_props);
// 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(Map::kSlackTrackingCounterEnd));
__ B(lt, &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);
}
// 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.
__ Add(new_obj, new_obj, kHeapObjectTag);
// Continue with JSObject being successfully allocated.
__ B(&allocated);
// Reload the original constructor and fall-through.
__ Bind(&rt_call_reload_new_target);
__ Peek(x3, 0 * kXRegSize);
}
// Allocate the new receiver object using the runtime call.
// x1: constructor function
// x3: original constructor
__ Bind(&rt_call);
__ Push(constructor, original_constructor); // arguments 1-2
__ CallRuntime(Runtime::kNewObject, 2);
__ Mov(x4, x0);
// Receiver for constructor call allocated.
// x4: JSObject
__ Bind(&allocated);
// Restore the parameters.
__ Pop(original_constructor);
__ Pop(constructor);
// Reload the number of arguments from the stack.
// Set it up in x0 for the function call below.
// jssp[0]: number of arguments (smi-tagged)
__ Peek(argc, 0); // Load number of arguments.
__ SmiUntag(argc);
__ Push(original_constructor, x4, x4);
// 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]: new.target
// 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]: new.target
// 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]: 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]: new.target (original constructor)
// 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);
}
void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {
Generate_JSConstructStubHelper(masm, true);
}
void Builtins::Generate_JSConstructStubForDerived(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- x0 : number of arguments
// -- x1 : constructor function
// -- x2 : allocation site or undefined
// -- x3 : original constructor
// -- lr : return address
// -- sp[...]: constructor arguments
// -----------------------------------
ASM_LOCATION("Builtins::Generate_JSConstructStubForDerived");
{
FrameScope frame_scope(masm, StackFrame::CONSTRUCT);
__ AssertUndefinedOrAllocationSite(x2, x10);
__ Mov(x4, x0);
__ SmiTag(x4);
__ LoadRoot(x10, Heap::kTheHoleValueRootIndex);
__ Push(x2, x4, x3, x10);
// sp[0]: receiver (the hole)
// sp[1]: new.target
// sp[2]: number of arguments
// sp[3]: allocation site
// 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]: new.target
// jssp[2]: number of arguments (smi-tagged)
// Compute the start address of the copy in x4.
__ Add(x4, x2, Operand(x0, LSL, kPointerSizeLog2));
Label loop, entry, done_copying_arguments;
__ B(&entry);
__ Bind(&loop);
__ Ldp(x10, x11, MemOperand(x4, -2 * kPointerSize, PreIndex));
__ Push(x11, x10);
__ Bind(&entry);
__ Cmp(x4, 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);
// Handle step in.
Label skip_step_in;
ExternalReference debug_step_in_fp =
ExternalReference::debug_step_in_fp_address(masm->isolate());
__ Mov(x2, Operand(debug_step_in_fp));
__ Ldr(x2, MemOperand(x2));
__ Cbz(x2, &skip_step_in);
__ Push(x0, x1, x1);
__ CallRuntime(Runtime::kHandleStepInForDerivedConstructors, 1);
__ Pop(x1, x0);
__ bind(&skip_step_in);
// Call the function.
// x0: number of arguments
// x1: constructor function
ParameterCount actual(x0);
__ InvokeFunction(x1, actual, CALL_FUNCTION, NullCallWrapper());
// Restore the context from the frame.
// x0: result
// jssp[0]: number of arguments (smi-tagged)
__ Ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
// Load number of arguments (smi), skipping over new.target.
__ Peek(x1, kPointerSize);
// Leave construct frame
}
__ DropBySMI(x1);
__ Drop(1);
__ Ret();
}
enum IsTagged { kArgcIsSmiTagged, kArgcIsUntaggedInt };
// Clobbers x10, x15; preserves all other registers.
static void Generate_CheckStackOverflow(MacroAssembler* masm, Register argc,
IsTagged argc_is_tagged) {
// 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.
// TODO(jbramley): Check that the stack usage here is safe.
__ Sub(x10, jssp, x10);
// Check if the arguments will overflow the stack.
if (argc_is_tagged == kArgcIsSmiTagged) {
__ Cmp(x10, Operand::UntagSmiAndScale(argc, kPointerSizeLog2));
} else {
DCHECK(argc_is_tagged == kArgcIsUntaggedInt);
__ Cmp(x10, Operand(argc, LSL, kPointerSizeLog2));
}
__ B(gt, &enough_stack_space);
__ CallRuntime(Runtime::kThrowStackOverflow, 0);
// We should never return from the APPLY_OVERFLOW builtin.
if (__ emit_debug_code()) {
__ Unreachable();
}
__ Bind(&enough_stack_space);
}
// Input:
// x0: new.target.
// 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 new_target = x0;
Register function = x1;
Register receiver = x2;
Register argc = x3;
Register argv = x4;
Register scratch = x10;
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);
// Setup the context (we need to use the caller context from the isolate).
__ Mov(scratch, Operand(ExternalReference(Isolate::kContextAddress,
masm->isolate())));
__ Ldr(cp, MemOperand(scratch));
__ InitializeRootRegister();
// Push the function and the receiver onto the stack.
__ Push(function, receiver);
// Check if we have enough stack space to push all arguments.
// Expects argument count in eax. Clobbers ecx, edx, edi.
Generate_CheckStackOverflow(masm, argc, kArgcIsUntaggedInt);
// Copy arguments to the stack in a loop, in reverse order.
// x3: argc.
// x4: argv.
Label loop, entry;
// Compute the copy end address.
__ Add(scratch, 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(scratch, argv);
__ B(ne, &loop);
__ Mov(scratch, argc);
__ Mov(argc, new_target);
__ Mov(new_target, scratch);
// x0: argc.
// x3: new.target.
// 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).
Handle<Code> builtin = is_construct
? masm->isolate()->builtins()->Construct()
: masm->isolate()->builtins()->Call();
__ Call(builtin, RelocInfo::CODE_TARGET);
// 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);
}
// Generate code for entering a JS function with the interpreter.
// On entry to the function the receiver and arguments have been pushed on the
// stack left to right. The actual argument count matches the formal parameter
// count expected by the function.
//
// The live registers are:
// - x1: the JS function object being called.
// - cp: our context.
// - fp: our caller's frame pointer.
// - jssp: stack pointer.
// - lr: return address.
//
// The function builds a JS frame. Please see JavaScriptFrameConstants in
// frames-arm64.h for its layout.
// TODO(rmcilroy): We will need to include the current bytecode pointer in the
// frame.
void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
// Open a frame scope to indicate that there is a frame on the stack. The
// MANUAL indicates that the scope shouldn't actually generate code to set up
// the frame (that is done below).
FrameScope frame_scope(masm, StackFrame::MANUAL);
__ Push(lr, fp, cp, x1);
__ Add(fp, jssp, StandardFrameConstants::kFixedFrameSizeFromFp);
// Get the bytecode array from the function object and load the pointer to the
// first entry into kInterpreterBytecodeRegister.
__ Ldr(x0, FieldMemOperand(x1, JSFunction::kSharedFunctionInfoOffset));
__ Ldr(kInterpreterBytecodeArrayRegister,
FieldMemOperand(x0, SharedFunctionInfo::kFunctionDataOffset));
if (FLAG_debug_code) {
// Check function data field is actually a BytecodeArray object.
__ AssertNotSmi(kInterpreterBytecodeArrayRegister,
kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
__ CompareObjectType(kInterpreterBytecodeArrayRegister, x0, x0,
BYTECODE_ARRAY_TYPE);
__ Assert(eq, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
}
// Allocate the local and temporary register file on the stack.
{
// Load frame size from the BytecodeArray object.
__ Ldr(w11, FieldMemOperand(kInterpreterBytecodeArrayRegister,
BytecodeArray::kFrameSizeOffset));
// Do a stack check to ensure we don't go over the limit.
Label ok;
DCHECK(jssp.Is(__ StackPointer()));
__ Sub(x10, jssp, Operand(x11));
__ CompareRoot(x10, Heap::kRealStackLimitRootIndex);
__ B(hs, &ok);
__ CallRuntime(Runtime::kThrowStackOverflow, 0);
__ Bind(&ok);
// If ok, push undefined as the initial value for all register file entries.
// Note: there should always be at least one stack slot for the return
// register in the register file.
Label loop_header;
__ LoadRoot(x10, Heap::kUndefinedValueRootIndex);
// TODO(rmcilroy): Ensure we always have an even number of registers to
// allow stack to be 16 bit aligned (and remove need for jssp).
__ Lsr(x11, x11, kPointerSizeLog2);
__ PushMultipleTimes(x10, x11);
__ Bind(&loop_header);
}
// TODO(rmcilroy): List of things not currently dealt with here but done in
// fullcodegen's prologue:
// - Support profiler (specifically profiling_counter).
// - Call ProfileEntryHookStub when isolate has a function_entry_hook.
// - Allow simulator stop operations if FLAG_stop_at is set.
// - Deal with sloppy mode functions which need to replace the
// receiver with the global proxy when called as functions (without an
// explicit receiver object).
// - Code aging of the BytecodeArray object.
// - Supporting FLAG_trace.
//
// The following items are also not done here, and will probably be done using
// explicit bytecodes instead:
// - Allocating a new local context if applicable.
// - Setting up a local binding to the this function, which is used in
// derived constructors with super calls.
// - Setting new.target if required.
// - Dealing with REST parameters (only if
// https://codereview.chromium.org/1235153006 doesn't land by then).
// - Dealing with argument objects.
// Perform stack guard check.
{
Label ok;
__ CompareRoot(jssp, Heap::kStackLimitRootIndex);
__ B(hs, &ok);
__ CallRuntime(Runtime::kStackGuard, 0);
__ Bind(&ok);
}
// Load accumulator, register file, bytecode offset, dispatch table into
// registers.
__ LoadRoot(kInterpreterAccumulatorRegister, Heap::kUndefinedValueRootIndex);
__ Sub(kInterpreterRegisterFileRegister, fp,
Operand(kPointerSize + StandardFrameConstants::kFixedFrameSizeFromFp));
__ Mov(kInterpreterBytecodeOffsetRegister,
Operand(BytecodeArray::kHeaderSize - kHeapObjectTag));
__ LoadRoot(kInterpreterDispatchTableRegister,
Heap::kInterpreterTableRootIndex);
__ Add(kInterpreterDispatchTableRegister, kInterpreterDispatchTableRegister,
Operand(FixedArray::kHeaderSize - kHeapObjectTag));
// Dispatch to the first bytecode handler for the function.
__ Ldrb(x1, MemOperand(kInterpreterBytecodeArrayRegister,
kInterpreterBytecodeOffsetRegister));
__ Mov(x1, Operand(x1, LSL, kPointerSizeLog2));
__ Ldr(ip0, MemOperand(kInterpreterDispatchTableRegister, x1));
// TODO(rmcilroy): Make dispatch table point to code entrys to avoid untagging
// and header removal.
__ Add(ip0, ip0, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Call(ip0);
}
void Builtins::Generate_InterpreterExitTrampoline(MacroAssembler* masm) {
// TODO(rmcilroy): List of things not currently dealt with here but done in
// fullcodegen's EmitReturnSequence.
// - Supporting FLAG_trace for Runtime::TraceExit.
// - Support profiler (specifically decrementing profiling_counter
// appropriately and calling out to HandleInterrupts if necessary).
// The return value is in accumulator, which is already in x0.
// Leave the frame (also dropping the register file).
__ LeaveFrame(StackFrame::JAVA_SCRIPT);
// Drop receiver + arguments and return.
__ Ldr(w1, FieldMemOperand(kInterpreterBytecodeArrayRegister,
BytecodeArray::kParameterSizeOffset));
__ Drop(x1, 1);
__ Ret();
}
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);
}
void Builtins::Generate_MarkCodeAsToBeExecutedOnce(MacroAssembler* masm) {
Generate_MarkCodeAsExecutedOnce(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) {
Register argc = x0;
Register function = x1;
Register scratch1 = x10;
Register scratch2 = x11;
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 callable to call (passed as receiver) from the stack.
__ Peek(function, Operand(argc, LSL, kXRegSizeLog2));
// 3. 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.
{
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);
}
// 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
__ LoadRoot(x2, Heap::kUndefinedValueRootIndex);
__ Ldr(x1, MemOperand(fp, kFunctionOffset));
__ Ldr(x4, MemOperand(fp, kNewTargetOffset));
// Call the function.
CallConstructStub stub(masm->isolate(), SUPER_CONSTRUCTOR_CALL);
__ Call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
// Leave internal frame.
}
__ Drop(kStackSize);
__ Ret();
}
void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
ASM_LOCATION("Builtins::Generate_FunctionApply");
Generate_ApplyHelper(masm, false);
}
void Builtins::Generate_ReflectApply(MacroAssembler* masm) {
ASM_LOCATION("Builtins::Generate_ReflectApply");
Generate_ApplyHelper(masm, true);
}
void Builtins::Generate_ReflectConstruct(MacroAssembler* masm) {
ASM_LOCATION("Builtins::Generate_ReflectConstruct");
Generate_ConstructHelper(masm);
}
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);
}
// static
void Builtins::Generate_CallFunction(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- x0 : the number of arguments (not including the receiver)
// -- x1 : the function to call (checked to be a JSFunction)
// -----------------------------------
Label convert, convert_global_proxy, convert_to_object, done_convert;
__ AssertFunction(x1);
// TODO(bmeurer): Throw a TypeError if function's [[FunctionKind]] internal
// slot is "classConstructor".
// Enter the context of the function; ToObject has to run in the function
// context, and we also need to take the global proxy from the function
// context in case of conversion.
// See ES6 section 9.2.1 [[Call]] ( thisArgument, argumentsList)
__ Ldr(cp, FieldMemOperand(x1, JSFunction::kContextOffset));
__ Ldr(x2, FieldMemOperand(x1, JSFunction::kSharedFunctionInfoOffset));
// We need to convert the receiver for non-native sloppy mode functions.
__ Ldr(w3, FieldMemOperand(x2, SharedFunctionInfo::kCompilerHintsOffset));
__ TestAndBranchIfAnySet(w3,
(1 << SharedFunctionInfo::kNative) |
(1 << SharedFunctionInfo::kStrictModeFunction),
&done_convert);
{
__ Peek(x3, Operand(x0, LSL, kXRegSizeLog2));
// ----------- S t a t e -------------
// -- x0 : the number of arguments (not including the receiver)
// -- x1 : the function to call (checked to be a JSFunction)
// -- x2 : the shared function info.
// -- x3 : the receiver
// -- cp : the function context.
// -----------------------------------
Label convert_receiver;
__ JumpIfSmi(x3, &convert_to_object);
STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
__ CompareObjectType(x3, x4, x4, FIRST_JS_RECEIVER_TYPE);
__ B(hs, &done_convert);
__ JumpIfRoot(x3, Heap::kUndefinedValueRootIndex, &convert_global_proxy);
__ JumpIfNotRoot(x3, Heap::kNullValueRootIndex, &convert_to_object);
__ Bind(&convert_global_proxy);
{
// Patch receiver to global proxy.
__ LoadGlobalProxy(x3);
}
__ B(&convert_receiver);
__ Bind(&convert_to_object);
{
// Convert receiver using ToObject.
// TODO(bmeurer): Inline the allocation here to avoid building the frame
// in the fast case? (fall back to AllocateInNewSpace?)
FrameScope scope(masm, StackFrame::INTERNAL);
__ SmiTag(x0);
__ Push(x0, x1);
__ Mov(x0, x3);
ToObjectStub stub(masm->isolate());
__ CallStub(&stub);
__ Mov(x3, x0);
__ Pop(x1, x0);
__ SmiUntag(x0);
}
__ Ldr(x2, FieldMemOperand(x1, JSFunction::kSharedFunctionInfoOffset));
__ Bind(&convert_receiver);
__ Poke(x3, Operand(x0, LSL, kXRegSizeLog2));
}
__ Bind(&done_convert);
// ----------- S t a t e -------------
// -- x0 : the number of arguments (not including the receiver)
// -- x1 : the function to call (checked to be a JSFunction)
// -- x2 : the shared function info.
// -- cp : the function context.
// -----------------------------------
__ Ldrsw(
x2, FieldMemOperand(x2, SharedFunctionInfo::kFormalParameterCountOffset));
__ Ldr(x3, FieldMemOperand(x1, JSFunction::kCodeEntryOffset));
ParameterCount actual(x0);
ParameterCount expected(x2);
__ InvokeCode(x3, expected, actual, JUMP_FUNCTION, NullCallWrapper());
}
// static
void Builtins::Generate_Call(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- x0 : the number of arguments (not including the receiver)
// -- x1 : the target to call (can be any Object).
// -----------------------------------
Label non_callable, non_function, non_smi;
__ JumpIfSmi(x1, &non_callable);
__ Bind(&non_smi);
__ CompareObjectType(x1, x4, x5, JS_FUNCTION_TYPE);
__ Jump(masm->isolate()->builtins()->CallFunction(), RelocInfo::CODE_TARGET,
eq);
__ Cmp(x5, JS_FUNCTION_PROXY_TYPE);
__ B(ne, &non_function);
// 1. Call to function proxy.
// TODO(neis): This doesn't match the ES6 spec for [[Call]] on proxies.
__ Ldr(x1, FieldMemOperand(x1, JSFunctionProxy::kCallTrapOffset));
__ AssertNotSmi(x1);
__ B(&non_smi);
// 2. Call to something else, which might have a [[Call]] internal method (if
// not we raise an exception).
__ Bind(&non_function);
// Check if target has a [[Call]] internal method.
__ Ldrb(x4, FieldMemOperand(x4, Map::kBitFieldOffset));
__ TestAndBranchIfAllClear(x4, 1 << Map::kIsCallable, &non_callable);
// Overwrite the original receiver with the (original) target.
__ Poke(x1, Operand(x0, LSL, kXRegSizeLog2));
// Let the "call_as_function_delegate" take care of the rest.
__ LoadGlobalFunction(Context::CALL_AS_FUNCTION_DELEGATE_INDEX, x1);
__ Jump(masm->isolate()->builtins()->CallFunction(), RelocInfo::CODE_TARGET);
// 3. Call to something that is not callable.
__ bind(&non_callable);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(x1);
__ CallRuntime(Runtime::kThrowCalledNonCallable, 1);
}
}
// static
void Builtins::Generate_ConstructFunction(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- x0 : the number of arguments (not including the receiver)
// -- x1 : the constructor to call (checked to be a JSFunction)
// -- x3 : the original constructor (checked to be a JSFunction)
// -----------------------------------
__ AssertFunction(x1);
__ AssertFunction(x3);
// Calling convention for function specific ConstructStubs require
// x2 to contain either an AllocationSite or undefined.
__ LoadRoot(x2, Heap::kUndefinedValueRootIndex);
// Tail call to the function-specific construct stub (still in the caller
// context at this point).
__ Ldr(x4, FieldMemOperand(x1, JSFunction::kSharedFunctionInfoOffset));
__ Ldr(x4, FieldMemOperand(x4, SharedFunctionInfo::kConstructStubOffset));
__ Add(x4, x4, Code::kHeaderSize - kHeapObjectTag);
__ Br(x4);
}
// static
void Builtins::Generate_ConstructProxy(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- x0 : the number of arguments (not including the receiver)
// -- x1 : the constructor to call (checked to be a JSFunctionProxy)
// -- x3 : the original constructor (either the same as the constructor or
// the JSFunction on which new was invoked initially)
// -----------------------------------
// TODO(neis): This doesn't match the ES6 spec for [[Construct]] on proxies.
__ Ldr(x1, FieldMemOperand(x1, JSFunctionProxy::kConstructTrapOffset));
__ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
}
// static
void Builtins::Generate_Construct(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- x0 : the number of arguments (not including the receiver)
// -- x1 : the constructor to call (can be any Object)
// -- x3 : the original constructor (either the same as the constructor or
// the JSFunction on which new was invoked initially)
// -----------------------------------
// Check if target has a [[Construct]] internal method.
Label non_constructor;
__ JumpIfSmi(x1, &non_constructor);
__ Ldr(x4, FieldMemOperand(x1, HeapObject::kMapOffset));
__ Ldrb(x2, FieldMemOperand(x4, Map::kBitFieldOffset));
__ TestAndBranchIfAllClear(x2, 1 << Map::kIsConstructor, &non_constructor);
// Dispatch based on instance type.
__ CompareInstanceType(x4, x5, JS_FUNCTION_TYPE);
__ Jump(masm->isolate()->builtins()->ConstructFunction(),
RelocInfo::CODE_TARGET, eq);
__ Cmp(x5, JS_FUNCTION_PROXY_TYPE);
__ Jump(masm->isolate()->builtins()->ConstructProxy(), RelocInfo::CODE_TARGET,
eq);
// Called Construct on an exotic Object with a [[Construct]] internal method.
{
// Overwrite the original receiver with the (original) target.
__ Poke(x1, Operand(x0, LSL, kXRegSizeLog2));
// Let the "call_as_constructor_delegate" take care of the rest.
__ LoadGlobalFunction(Context::CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, x1);
__ Jump(masm->isolate()->builtins()->CallFunction(),
RelocInfo::CODE_TARGET);
}
// Called Construct on an Object that doesn't have a [[Construct]] internal
// method.
__ bind(&non_constructor);
{
FrameScope scope(masm, StackFrame::INTERNAL);
__ Push(x1);
__ CallRuntime(Runtime::kThrowCalledNonCallable, 1);
}
}
// static
void Builtins::Generate_PushArgsAndCall(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- x0 : the number of arguments (not including the receiver)
// -- x2 : the address of the first argument to be pushed. Subsequent
// arguments should be consecutive above this, in the same order as
// they are to be pushed onto the stack.
// -- x1 : the target to call (can be any Object).
// Find the address of the last argument.
__ add(x3, x0, Operand(1)); // Add one for receiver.
__ lsl(x3, x3, kPointerSizeLog2);
__ sub(x4, x2, x3);
// Push the arguments.
Label loop_header, loop_check;
__ Mov(x5, jssp);
__ Claim(x3, 1);
__ B(&loop_check);
__ Bind(&loop_header);
// TODO(rmcilroy): Push two at a time once we ensure we keep stack aligned.
__ Ldr(x3, MemOperand(x2, -kPointerSize, PostIndex));
__ Str(x3, MemOperand(x5, -kPointerSize, PreIndex));
__ Bind(&loop_check);
__ Cmp(x2, x4);
__ B(gt, &loop_header);
// Call the target.
__ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
}
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(scratch2, 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, scratch2);
__ 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, scratch2, 2 * kPointerSize);
__ Claim(scratch1, 1);
// Copy the arguments (including the receiver) to the new stack frame.
Label copy_2_by_2;
__ Bind(&copy_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, &copy_2_by_2);
// Correct the space allocated for the extra slot.
__ Drop(1);
__ B(&invoke);
}
{ // Too few parameters: Actual < expected
__ Bind(&too_few);
Register copy_from = x10;
Register copy_end = x11;
Register copy_to = x12;
Register scratch1 = x13, scratch2 = x14;
// If the function is strong we need to throw an error.
Label no_strong_error;
__ Ldr(scratch1,
FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
__ Ldr(scratch2.W(),
FieldMemOperand(scratch1, SharedFunctionInfo::kCompilerHintsOffset));
__ TestAndBranchIfAllClear(scratch2.W(),
(1 << SharedFunctionInfo::kStrongModeFunction),
&no_strong_error);
// What we really care about is the required number of arguments.
DCHECK_EQ(kPointerSize, kInt64Size);
__ Ldr(scratch2.W(),
FieldMemOperand(scratch1, SharedFunctionInfo::kLengthOffset));
__ Cmp(argc_actual, Operand(scratch2, LSR, 1));
__ B(ge, &no_strong_error);
{
FrameScope frame(masm, StackFrame::MANUAL);
EnterArgumentsAdaptorFrame(masm);
__ CallRuntime(Runtime::kThrowStrongModeTooFewArguments, 0);
}
__ Bind(&no_strong_error);
EnterArgumentsAdaptorFrame(masm);
__ Lsl(scratch2, 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, scratch2, 2 * kPointerSize);
__ Claim(scratch1, 1);
// Copy the arguments (including the receiver) to the new stack frame.
Label copy_2_by_2;
__ Bind(&copy_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, &copy_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);
__ Mov(argc_actual, argc_expected);
// x0 : expected number of arguments
// x1 : function (passed through to callee)
__ 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);
__ CallRuntime(Runtime::kThrowStackOverflow, 0);
__ Unreachable();
}
}
#undef __
} // namespace internal
} // namespace v8
#endif // V8_TARGET_ARCH_ARM