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// Copyright 2017 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/builtins/builtins-arguments-gen.h"
#include "src/builtins/builtins-utils-gen.h"
#include "src/builtins/builtins.h"
#include "src/codegen/code-factory.h"
#include "src/codegen/code-stub-assembler.h"
#include "src/codegen/interface-descriptors.h"
#include "src/execution/arguments.h"
#include "src/execution/frame-constants.h"
#include "src/objects/arguments.h"
#include "src/objects/objects-inl.h"
namespace v8 {
namespace internal {
using Node = compiler::Node;
std::tuple<Node*, Node*, Node*>
ArgumentsBuiltinsAssembler::AllocateArgumentsObject(Node* map,
Node* arguments_count,
Node* parameter_map_count,
ParameterMode mode,
int base_size) {
// Allocate the parameter object (either a Rest parameter object, a strict
// argument object or a sloppy arguments object) and the elements/mapped
// arguments together.
int elements_offset = base_size;
Node* element_count = arguments_count;
if (parameter_map_count != nullptr) {
base_size += FixedArray::kHeaderSize;
element_count = IntPtrOrSmiAdd(element_count, parameter_map_count, mode);
}
bool empty = IsIntPtrOrSmiConstantZero(arguments_count, mode);
DCHECK_IMPLIES(empty, parameter_map_count == nullptr);
TNode<IntPtrT> size =
empty ? IntPtrConstant(base_size)
: ElementOffsetFromIndex(element_count, PACKED_ELEMENTS, mode,
base_size + FixedArray::kHeaderSize);
TNode<HeapObject> result = Allocate(size);
Comment("Initialize arguments object");
StoreMapNoWriteBarrier(result, map);
TNode<FixedArray> empty_fixed_array = EmptyFixedArrayConstant();
StoreObjectField(result, JSArray::kPropertiesOrHashOffset, empty_fixed_array);
TNode<Smi> smi_arguments_count = ParameterToTagged(arguments_count, mode);
StoreObjectFieldNoWriteBarrier(result, JSArray::kLengthOffset,
smi_arguments_count);
Node* arguments = nullptr;
if (!empty) {
arguments = InnerAllocate(result, elements_offset);
StoreObjectFieldNoWriteBarrier(arguments, FixedArray::kLengthOffset,
smi_arguments_count);
TNode<Map> fixed_array_map = FixedArrayMapConstant();
StoreMapNoWriteBarrier(arguments, fixed_array_map);
}
Node* parameter_map = nullptr;
if (parameter_map_count != nullptr) {
TNode<IntPtrT> parameter_map_offset = ElementOffsetFromIndex(
arguments_count, PACKED_ELEMENTS, mode, FixedArray::kHeaderSize);
parameter_map = InnerAllocate(CAST(arguments), parameter_map_offset);
StoreObjectFieldNoWriteBarrier(result, JSArray::kElementsOffset,
parameter_map);
TNode<Map> sloppy_elements_map = SloppyArgumentsElementsMapConstant();
StoreMapNoWriteBarrier(parameter_map, sloppy_elements_map);
parameter_map_count = ParameterToTagged(parameter_map_count, mode);
StoreObjectFieldNoWriteBarrier(parameter_map, FixedArray::kLengthOffset,
parameter_map_count);
} else {
if (empty) {
StoreObjectFieldNoWriteBarrier(result, JSArray::kElementsOffset,
empty_fixed_array);
} else {
StoreObjectFieldNoWriteBarrier(result, JSArray::kElementsOffset,
arguments);
}
}
return std::tuple<Node*, Node*, Node*>(result, arguments, parameter_map);
}
Node* ArgumentsBuiltinsAssembler::ConstructParametersObjectFromArgs(
Node* map, Node* frame_ptr, Node* arg_count, Node* first_arg,
Node* rest_count, ParameterMode param_mode, int base_size) {
// Allocate the parameter object (either a Rest parameter object, a strict
// argument object or a sloppy arguments object) and the elements together and
// fill in the contents with the arguments above |formal_parameter_count|.
Node* result;
Node* elements;
Node* unused;
std::tie(result, elements, unused) =
AllocateArgumentsObject(map, rest_count, nullptr, param_mode, base_size);
DCHECK_NULL(unused);
CodeStubArguments arguments(this, arg_count, frame_ptr, param_mode);
VARIABLE(offset, MachineType::PointerRepresentation());
offset.Bind(IntPtrConstant(FixedArrayBase::kHeaderSize - kHeapObjectTag));
VariableList list({&offset}, zone());
arguments.ForEach(
list,
[this, elements, &offset](Node* arg) {
StoreNoWriteBarrier(MachineRepresentation::kTagged, elements,
offset.value(), arg);
Increment(&offset, kTaggedSize);
},
first_arg, nullptr, param_mode);
return result;
}
Node* ArgumentsBuiltinsAssembler::EmitFastNewRestParameter(Node* context,
Node* function) {
ParameterMode mode = OptimalParameterMode();
Node* zero = IntPtrOrSmiConstant(0, mode);
TorqueStructArgumentsInfo info = GetArgumentsFrameAndCount(
CAST(context), UncheckedCast<JSFunction>(function));
VARIABLE(result, MachineRepresentation::kTagged);
Label no_rest_parameters(this), runtime(this, Label::kDeferred),
done(this, &result);
Node* rest_count =
IntPtrOrSmiSub(info.argument_count, info.formal_parameter_count, mode);
TNode<NativeContext> const native_context = LoadNativeContext(context);
TNode<Map> const array_map =
LoadJSArrayElementsMap(PACKED_ELEMENTS, native_context);
GotoIf(IntPtrOrSmiLessThanOrEqual(rest_count, zero, mode),
&no_rest_parameters);
GotoIfFixedArraySizeDoesntFitInNewSpace(
rest_count, &runtime, JSArray::kSize + FixedArray::kHeaderSize, mode);
// Allocate the Rest JSArray and the elements together and fill in the
// contents with the arguments above |formal_parameter_count|.
result.Bind(ConstructParametersObjectFromArgs(
array_map, info.frame, info.argument_count, info.formal_parameter_count,
rest_count, mode, JSArray::kSize));
Goto(&done);
BIND(&no_rest_parameters);
{
Node* arguments;
Node* elements;
Node* unused;
std::tie(arguments, elements, unused) =
AllocateArgumentsObject(array_map, zero, nullptr, mode, JSArray::kSize);
result.Bind(arguments);
Goto(&done);
}
BIND(&runtime);
{
result.Bind(CallRuntime(Runtime::kNewRestParameter, context, function));
Goto(&done);
}
BIND(&done);
return result.value();
}
Node* ArgumentsBuiltinsAssembler::EmitFastNewStrictArguments(Node* context,
Node* function) {
VARIABLE(result, MachineRepresentation::kTagged);
Label done(this, &result), empty(this), runtime(this, Label::kDeferred);
ParameterMode mode = OptimalParameterMode();
TNode<BInt> zero = BIntConstant(0);
TorqueStructArgumentsInfo info = GetArgumentsFrameAndCount(
CAST(context), UncheckedCast<JSFunction>(function));
GotoIfFixedArraySizeDoesntFitInNewSpace(
info.argument_count, &runtime,
JSStrictArgumentsObject::kSize + FixedArray::kHeaderSize, mode);
TNode<NativeContext> const native_context = LoadNativeContext(context);
TNode<Object> const map =
LoadContextElement(native_context, Context::STRICT_ARGUMENTS_MAP_INDEX);
GotoIf(BIntEqual(info.argument_count, zero), &empty);
result.Bind(ConstructParametersObjectFromArgs(
map, info.frame, info.argument_count, zero, info.argument_count, mode,
JSStrictArgumentsObject::kSize));
Goto(&done);
BIND(&empty);
{
Node* arguments;
Node* elements;
Node* unused;
std::tie(arguments, elements, unused) = AllocateArgumentsObject(
map, zero, nullptr, mode, JSStrictArgumentsObject::kSize);
result.Bind(arguments);
Goto(&done);
}
BIND(&runtime);
{
result.Bind(CallRuntime(Runtime::kNewStrictArguments, context, function));
Goto(&done);
}
BIND(&done);
return result.value();
}
Node* ArgumentsBuiltinsAssembler::EmitFastNewSloppyArguments(Node* context,
Node* function) {
VARIABLE(result, MachineRepresentation::kTagged);
ParameterMode mode = OptimalParameterMode();
TNode<BInt> zero = BIntConstant(0);
Label done(this, &result), empty(this), no_parameters(this),
runtime(this, Label::kDeferred);
TorqueStructArgumentsInfo info = GetArgumentsFrameAndCount(
CAST(context), UncheckedCast<JSFunction>(function));
GotoIf(BIntEqual(info.argument_count, zero), &empty);
GotoIf(BIntEqual(info.formal_parameter_count, zero), &no_parameters);
{
Comment("Mapped parameter JSSloppyArgumentsObject");
Node* mapped_count =
IntPtrOrSmiMin(info.argument_count, info.formal_parameter_count, mode);
Node* parameter_map_size =
IntPtrOrSmiAdd(mapped_count, IntPtrOrSmiConstant(2, mode), mode);
// Verify that the overall allocation will fit in new space.
Node* elements_allocated =
IntPtrOrSmiAdd(info.argument_count, parameter_map_size, mode);
GotoIfFixedArraySizeDoesntFitInNewSpace(
elements_allocated, &runtime,
JSSloppyArgumentsObject::kSize + FixedArray::kHeaderSize * 2, mode);
TNode<NativeContext> const native_context = LoadNativeContext(context);
TNode<Object> const map = LoadContextElement(
native_context, Context::FAST_ALIASED_ARGUMENTS_MAP_INDEX);
Node* argument_object;
Node* elements;
Node* map_array;
std::tie(argument_object, elements, map_array) =
AllocateArgumentsObject(map, info.argument_count, parameter_map_size,
mode, JSSloppyArgumentsObject::kSize);
StoreObjectFieldNoWriteBarrier(
argument_object, JSSloppyArgumentsObject::kCalleeOffset, function);
StoreFixedArrayElement(CAST(map_array), 0, context, SKIP_WRITE_BARRIER);
StoreFixedArrayElement(CAST(map_array), 1, elements, SKIP_WRITE_BARRIER);
Comment("Fill in non-mapped parameters");
TNode<IntPtrT> argument_offset =
ElementOffsetFromIndex(info.argument_count, PACKED_ELEMENTS, mode,
FixedArray::kHeaderSize - kHeapObjectTag);
TNode<IntPtrT> mapped_offset =
ElementOffsetFromIndex(mapped_count, PACKED_ELEMENTS, mode,
FixedArray::kHeaderSize - kHeapObjectTag);
CodeStubArguments arguments(this, info.argument_count, info.frame, mode);
VARIABLE(current_argument, MachineType::PointerRepresentation());
current_argument.Bind(arguments.AtIndexPtr(info.argument_count, mode));
VariableList var_list1({¤t_argument}, zone());
mapped_offset = UncheckedCast<IntPtrT>(BuildFastLoop(
var_list1, argument_offset, mapped_offset,
[this, elements, ¤t_argument](Node* offset) {
Increment(¤t_argument, kSystemPointerSize);
TNode<Object> arg = LoadBufferObject(
UncheckedCast<RawPtrT>(current_argument.value()), 0);
StoreNoWriteBarrier(MachineRepresentation::kTagged, elements, offset,
arg);
},
-kTaggedSize, INTPTR_PARAMETERS));
// Copy the parameter slots and the holes in the arguments.
// We need to fill in mapped_count slots. They index the context,
// where parameters are stored in reverse order, at
// MIN_CONTEXT_SLOTS .. MIN_CONTEXT_SLOTS+argument_count-1
// The mapped parameter thus need to get indices
// MIN_CONTEXT_SLOTS+parameter_count-1 ..
// MIN_CONTEXT_SLOTS+argument_count-mapped_count
// We loop from right to left.
Comment("Fill in mapped parameters");
VARIABLE(context_index, OptimalParameterRepresentation());
context_index.Bind(IntPtrOrSmiSub(
IntPtrOrSmiAdd(IntPtrOrSmiConstant(Context::MIN_CONTEXT_SLOTS, mode),
info.formal_parameter_count, mode),
mapped_count, mode));
TNode<Oddball> the_hole = TheHoleConstant();
VariableList var_list2({&context_index}, zone());
const int kParameterMapHeaderSize = FixedArray::OffsetOfElementAt(2);
TNode<IntPtrT> adjusted_map_array = IntPtrAdd(
BitcastTaggedToWord(map_array),
IntPtrConstant(kParameterMapHeaderSize - FixedArray::kHeaderSize));
TNode<IntPtrT> zero_offset = ElementOffsetFromIndex(
zero, PACKED_ELEMENTS, mode, FixedArray::kHeaderSize - kHeapObjectTag);
BuildFastLoop(
var_list2, mapped_offset, zero_offset,
[=, &context_index](Node* offset) {
StoreNoWriteBarrier(MachineRepresentation::kTagged, elements, offset,
the_hole);
StoreNoWriteBarrier(MachineRepresentation::kTagged,
adjusted_map_array, offset,
ParameterToTagged(context_index.value(), mode));
Increment(&context_index, 1, mode);
},
-kTaggedSize, INTPTR_PARAMETERS);
result.Bind(argument_object);
Goto(&done);
}
BIND(&no_parameters);
{
Comment("No parameters JSSloppyArgumentsObject");
GotoIfFixedArraySizeDoesntFitInNewSpace(
info.argument_count, &runtime,
JSSloppyArgumentsObject::kSize + FixedArray::kHeaderSize, mode);
TNode<NativeContext> const native_context = LoadNativeContext(context);
TNode<Object> const map =
LoadContextElement(native_context, Context::SLOPPY_ARGUMENTS_MAP_INDEX);
result.Bind(ConstructParametersObjectFromArgs(
map, info.frame, info.argument_count, zero, info.argument_count, mode,
JSSloppyArgumentsObject::kSize));
StoreObjectFieldNoWriteBarrier(
result.value(), JSSloppyArgumentsObject::kCalleeOffset, function);
Goto(&done);
}
BIND(&empty);
{
Comment("Empty JSSloppyArgumentsObject");
TNode<NativeContext> const native_context = LoadNativeContext(context);
TNode<Object> const map =
LoadContextElement(native_context, Context::SLOPPY_ARGUMENTS_MAP_INDEX);
Node* arguments;
Node* elements;
Node* unused;
std::tie(arguments, elements, unused) = AllocateArgumentsObject(
map, zero, nullptr, mode, JSSloppyArgumentsObject::kSize);
result.Bind(arguments);
StoreObjectFieldNoWriteBarrier(
result.value(), JSSloppyArgumentsObject::kCalleeOffset, function);
Goto(&done);
}
BIND(&runtime);
{
result.Bind(CallRuntime(Runtime::kNewSloppyArguments, context, function));
Goto(&done);
}
BIND(&done);
return result.value();
}
} // namespace internal
} // namespace v8