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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/codegen/code-stub-assembler.h"
#include "src/objects/js-list-format-inl.h"
#include "src/objects/js-list-format.h"
#include "src/objects/objects-inl.h"
#include "src/objects/objects.h"
namespace v8 {
namespace internal {
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);
TNode<IntPtrT> PointerToSeqStringData(TNode<String> seq_string) {
CSA_ASSERT(this,
IsSequentialStringInstanceType(LoadInstanceType(seq_string)));
STATIC_ASSERT(SeqOneByteString::kHeaderSize ==
SeqTwoByteString::kHeaderSize);
return IntPtrAdd(
BitcastTaggedToWord(seq_string),
IntPtrConstant(SeqOneByteString::kHeaderSize - kHeapObjectTag));
}
};
TF_BUILTIN(StringToLowerCaseIntl, IntlBuiltinsAssembler) {
const auto string = Parameter<String>(Descriptor::kString);
Label call_c(this), return_string(this), runtime(this, Label::kDeferred);
// Early exit on empty strings.
const TNode<Uint32T> length = LoadStringLengthAsWord32(string);
GotoIf(Word32Equal(length, Uint32Constant(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);
const TNode<Int32T> 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.
const TNode<String> dst = AllocateSeqOneByteString(length);
const int kMaxShortStringLength = 24; // Determined empirically.
GotoIf(Uint32GreaterThan(length, Uint32Constant(kMaxShortStringLength)),
&call_c);
{
const TNode<IntPtrT> dst_ptr = PointerToSeqStringData(dst);
TVARIABLE(IntPtrT, var_cursor, IntPtrConstant(0));
const TNode<IntPtrT> start_address =
ReinterpretCast<IntPtrT>(to_direct.PointerToData(&call_c));
const TNode<IntPtrT> end_address =
Signed(IntPtrAdd(start_address, ChangeUint32ToWord(length)));
const TNode<ExternalReference> to_lower_table_addr =
ExternalConstant(ExternalReference::intl_to_latin1_lower_table());
TVARIABLE(Word32T, var_did_change, Int32Constant(0));
VariableList push_vars({&var_cursor, &var_did_change}, zone());
BuildFastLoop<IntPtrT>(
push_vars, start_address, end_address,
[&](TNode<IntPtrT> current) {
TNode<Uint8T> c = Load<Uint8T>(current);
TNode<Uint8T> lower =
Load<Uint8T>(to_lower_table_addr, ChangeInt32ToIntPtr(c));
StoreNoWriteBarrier(MachineRepresentation::kWord8, dst_ptr,
var_cursor.value(), lower);
var_did_change =
Word32Or(Word32NotEqual(c, lower), var_did_change.value());
Increment(&var_cursor);
},
kCharSize, 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:
// String ConvertOneByteToLower(String src, String dst);
BIND(&call_c);
{
const TNode<String> src = to_direct.string();
const TNode<ExternalReference> function_addr =
ExternalConstant(ExternalReference::intl_convert_one_byte_to_lower());
MachineType type_tagged = MachineType::AnyTagged();
const TNode<String> result = CAST(CallCFunction(
function_addr, type_tagged, std::make_pair(type_tagged, src),
std::make_pair(type_tagged, dst)));
Return(result);
}
BIND(&return_string);
Return(string);
BIND(&runtime);
{
const TNode<Object> result = CallRuntime(Runtime::kStringToLowerCaseIntl,
NoContextConstant(), string);
Return(result);
}
}
TF_BUILTIN(StringPrototypeToLowerCaseIntl, IntlBuiltinsAssembler) {
auto maybe_string = Parameter<Object>(Descriptor::kReceiver);
auto context = Parameter<Context>(Descriptor::kContext);
TNode<String> string =
ToThisString(context, maybe_string, "String.prototype.toLowerCase");
Return(CallBuiltin(Builtin::kStringToLowerCaseIntl, context, string));
}
void IntlBuiltinsAssembler::ListFormatCommon(TNode<Context> context,
TNode<Int32T> argc,
Runtime::FunctionId format_func_id,
const char* method_name) {
CodeStubArguments args(this, 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_LIST_FORMAT_TYPE, method_name);
TNode<JSListFormat> list_format = CAST(receiver);
TNode<Object> list = args.GetOptionalArgumentValue(0);
{
// 4. Let stringList be ? StringListFromIterable(list).
TNode<Object> string_list =
CallBuiltin(Builtin::kStringListFromIterable, context, list);
// 6. Return ? FormatList(lf, stringList).
args.PopAndReturn(
CallRuntime(format_func_id, context, list_format, string_list));
}
}
TNode<JSArray> IntlBuiltinsAssembler::AllocateEmptyJSArray(
TNode<Context> context) {
return CodeStubAssembler::AllocateJSArray(
PACKED_ELEMENTS,
LoadJSArrayElementsMap(PACKED_ELEMENTS, LoadNativeContext(context)),
IntPtrConstant(0), SmiConstant(0));
}
TF_BUILTIN(ListFormatPrototypeFormat, IntlBuiltinsAssembler) {
ListFormatCommon(
Parameter<Context>(Descriptor::kContext),
UncheckedParameter<Int32T>(Descriptor::kJSActualArgumentsCount),
Runtime::kFormatList, "Intl.ListFormat.prototype.format");
}
TF_BUILTIN(ListFormatPrototypeFormatToParts, IntlBuiltinsAssembler) {
ListFormatCommon(
Parameter<Context>(Descriptor::kContext),
UncheckedParameter<Int32T>(Descriptor::kJSActualArgumentsCount),
Runtime::kFormatListToParts, "Intl.ListFormat.prototype.formatToParts");
}
} // namespace internal
} // namespace v8
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