1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
// 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) {
TNode<String> const string = CAST(Parameter(Descriptor::kString));
Label call_c(this), return_string(this), runtime(this, Label::kDeferred);
// Early exit on empty strings.
TNode<Uint32T> const 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);
TNode<Int32T> 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.
TNode<String> const 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));
TNode<IntPtrT> const start_address =
ReinterpretCast<IntPtrT>(to_direct.PointerToData(&call_c));
TNode<IntPtrT> const end_address =
Signed(IntPtrAdd(start_address, ChangeUint32ToWord(length)));
TNode<ExternalReference> const 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);
{
TNode<String> const src = to_direct.string();
TNode<ExternalReference> const 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);
{
TNode<Object> const result = CallRuntime(Runtime::kStringToLowerCaseIntl,
NoContextConstant(), string);
Return(result);
}
}
TF_BUILTIN(StringPrototypeToLowerCaseIntl, IntlBuiltinsAssembler) {
TNode<Object> maybe_string = CAST(Parameter(Descriptor::kReceiver));
TNode<Context> context = CAST(Parameter(Descriptor::kContext));
TNode<String> 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, 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(Builtins::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)),
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
|
