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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.
#ifndef V8_INTL_SUPPORT
#error Internationalization is expected to be enabled.
#endif // V8_INTL_SUPPORT
#include "src/builtins/builtins-iterator-gen.h"
#include "src/builtins/builtins-utils-gen.h"
#include "src/code-stub-assembler.h"
#include "src/objects-inl.h"
#include "src/objects.h"
#include "src/objects/js-list-format-inl.h"
#include "src/objects/js-list-format.h"
namespace v8 {
namespace internal {
template <class T>
using TNode = compiler::TNode<T>;
class IntlBuiltinsAssembler : public CodeStubAssembler {
public:
explicit IntlBuiltinsAssembler(compiler::CodeAssemblerState* state)
: CodeStubAssembler(state) {}
void ListFormatCommon(TNode<Context> context, TNode<Int32T> argc,
Runtime::FunctionId format_func_id,
const char* method_name);
TNode<JSArray> AllocateEmptyJSArray(TNode<Context> context);
};
TF_BUILTIN(StringToLowerCaseIntl, IntlBuiltinsAssembler) {
Node* const string = Parameter(Descriptor::kString);
Node* const context = Parameter(Descriptor::kContext);
CSA_ASSERT(this, IsString(string));
Label call_c(this), return_string(this), runtime(this, Label::kDeferred);
// Early exit on empty strings.
TNode<Smi> const length = LoadStringLengthAsSmi(string);
GotoIf(SmiEqual(length, SmiConstant(0)), &return_string);
// Unpack strings if possible, and bail to runtime unless we get a one-byte
// flat string.
ToDirectStringAssembler to_direct(
state(), string, ToDirectStringAssembler::kDontUnpackSlicedStrings);
to_direct.TryToDirect(&runtime);
Node* const instance_type = to_direct.instance_type();
CSA_ASSERT(this,
Word32BinaryNot(IsIndirectStringInstanceType(instance_type)));
GotoIfNot(IsOneByteStringInstanceType(instance_type), &runtime);
// For short strings, do the conversion in CSA through the lookup table.
Node* const dst = AllocateSeqOneByteString(context, length);
const int kMaxShortStringLength = 24; // Determined empirically.
GotoIf(SmiGreaterThan(length, SmiConstant(kMaxShortStringLength)), &call_c);
{
Node* const dst_ptr = PointerToSeqStringData(dst);
VARIABLE(var_cursor, MachineType::PointerRepresentation(),
IntPtrConstant(0));
Node* const start_address = to_direct.PointerToData(&call_c);
TNode<IntPtrT> const end_address =
Signed(IntPtrAdd(start_address, SmiUntag(length)));
Node* const to_lower_table_addr =
ExternalConstant(ExternalReference::intl_to_latin1_lower_table());
VARIABLE(var_did_change, MachineRepresentation::kWord32, Int32Constant(0));
VariableList push_vars({&var_cursor, &var_did_change}, zone());
BuildFastLoop(push_vars, start_address, end_address,
[=, &var_cursor, &var_did_change](Node* current) {
Node* c = Load(MachineType::Uint8(), current);
Node* lower =
Load(MachineType::Uint8(), to_lower_table_addr,
ChangeInt32ToIntPtr(c));
StoreNoWriteBarrier(MachineRepresentation::kWord8, dst_ptr,
var_cursor.value(), lower);
var_did_change.Bind(Word32Or(Word32NotEqual(c, lower),
var_did_change.value()));
Increment(&var_cursor);
},
kCharSize, INTPTR_PARAMETERS, IndexAdvanceMode::kPost);
// Return the original string if it remained unchanged in order to preserve
// e.g. internalization and private symbols (such as the preserved object
// hash) on the source string.
GotoIfNot(var_did_change.value(), &return_string);
Return(dst);
}
// Call into C for case conversion. The signature is:
// Object* ConvertOneByteToLower(String* src, String* dst, Isolate* isolate);
BIND(&call_c);
{
Node* const src = to_direct.string();
Node* const function_addr =
ExternalConstant(ExternalReference::intl_convert_one_byte_to_lower());
Node* const isolate_ptr =
ExternalConstant(ExternalReference::isolate_address(isolate()));
MachineType type_ptr = MachineType::Pointer();
MachineType type_tagged = MachineType::AnyTagged();
Node* const result =
CallCFunction3(type_tagged, type_tagged, type_tagged, type_ptr,
function_addr, src, dst, isolate_ptr);
Return(result);
}
BIND(&return_string);
Return(string);
BIND(&runtime);
{
Node* const result = CallRuntime(Runtime::kStringToLowerCaseIntl,
NoContextConstant(), string);
Return(result);
}
}
TF_BUILTIN(StringPrototypeToLowerCaseIntl, IntlBuiltinsAssembler) {
Node* const maybe_string = Parameter(Descriptor::kReceiver);
Node* const context = Parameter(Descriptor::kContext);
Node* const string =
ToThisString(context, maybe_string, "String.prototype.toLowerCase");
Return(CallBuiltin(Builtins::kStringToLowerCaseIntl, context, string));
}
void IntlBuiltinsAssembler::ListFormatCommon(TNode<Context> context,
TNode<Int32T> argc,
Runtime::FunctionId format_func_id,
const char* method_name) {
CodeStubArguments args(this, ChangeInt32ToIntPtr(argc));
// Label has_list(this);
// 1. Let lf be this value.
// 2. If Type(lf) is not Object, throw a TypeError exception.
TNode<Object> receiver = args.GetReceiver();
// 3. If lf does not have an [[InitializedListFormat]] internal slot, throw a
// TypeError exception.
ThrowIfNotInstanceType(context, receiver, JS_INTL_LIST_FORMAT_TYPE,
method_name);
TNode<JSListFormat> list_format = CAST(receiver);
// 4. If list is not provided or is undefined, then
TNode<Object> list = args.GetOptionalArgumentValue(0);
Label has_list(this);
{
GotoIfNot(IsUndefined(list), &has_list);
if (format_func_id == Runtime::kFormatList) {
// a. Return an empty String.
args.PopAndReturn(EmptyStringConstant());
} else {
DCHECK_EQ(format_func_id, Runtime::kFormatListToParts);
// a. Return an empty Array.
args.PopAndReturn(AllocateEmptyJSArray(context));
}
}
BIND(&has_list);
{
// 5. Let x be ? IterableToList(list).
IteratorBuiltinsAssembler iterator_assembler(state());
// TODO(adamk): Consider exposing IterableToList as a buitin and calling
// it from here instead of inlining the operation.
TNode<JSArray> x = iterator_assembler.IterableToList(context, list);
// 6. Return ? FormatList(lf, x).
args.PopAndReturn(CallRuntime(format_func_id, context, list_format, x));
}
}
TNode<JSArray> IntlBuiltinsAssembler::AllocateEmptyJSArray(
TNode<Context> context) {
return CAST(CodeStubAssembler::AllocateJSArray(
PACKED_ELEMENTS,
LoadJSArrayElementsMap(PACKED_ELEMENTS, LoadNativeContext(context)),
SmiConstant(0), SmiConstant(0)));
}
TF_BUILTIN(ListFormatPrototypeFormat, IntlBuiltinsAssembler) {
ListFormatCommon(
CAST(Parameter(Descriptor::kContext)),
UncheckedCast<Int32T>(Parameter(Descriptor::kJSActualArgumentsCount)),
Runtime::kFormatList, "Intl.ListFormat.prototype.format");
}
TF_BUILTIN(ListFormatPrototypeFormatToParts, IntlBuiltinsAssembler) {
ListFormatCommon(
CAST(Parameter(Descriptor::kContext)),
UncheckedCast<Int32T>(Parameter(Descriptor::kJSActualArgumentsCount)),
Runtime::kFormatListToParts, "Intl.ListFormat.prototype.formatToParts");
}
} // namespace internal
} // namespace v8
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