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Move string-related runtime functions into separate files.

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R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/604703004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24261 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
yangguo@chromium.org 2014-09-29 07:08:15 +00:00
parent 4e116f383b
commit 3ef16353ba
9 changed files with 2837 additions and 2796 deletions
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5
BUILD.gn
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@ -821,9 +821,14 @@ source_set("v8_base") {
"src/runtime-profiler.cc",
"src/runtime-profiler.h",
"src/runtime/runtime-i18n.cc",
"src/runtime/runtime-json.cc",
"src/runtime/runtime-regexp.cc",
"src/runtime/runtime-strings.cc",
"src/runtime/runtime-uri.cc",
"src/runtime/runtime-utils.h",
"src/runtime/runtime.cc",
"src/runtime/runtime.h",
"src/runtime/string-builder.h",
"src/safepoint-table.cc",
"src/safepoint-table.h",
"src/sampler.cc",

54
src/runtime/runtime-json.cc Normal file
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@ -0,0 +1,54 @@
// Copyright 2014 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/v8.h"
#include "src/arguments.h"
#include "src/json-parser.h"
#include "src/json-stringifier.h"
#include "src/runtime/runtime.h"
#include "src/runtime/runtime-utils.h"
namespace v8 {
namespace internal {
RUNTIME_FUNCTION(Runtime_QuoteJSONString) {
HandleScope scope(isolate);
CONVERT_ARG_HANDLE_CHECKED(String, string, 0);
DCHECK(args.length() == 1);
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result, BasicJsonStringifier::StringifyString(isolate, string));
return *result;
}
RUNTIME_FUNCTION(Runtime_BasicJSONStringify) {
HandleScope scope(isolate);
DCHECK(args.length() == 1);
CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
BasicJsonStringifier stringifier(isolate);
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
stringifier.Stringify(object));
return *result;
}
RUNTIME_FUNCTION(Runtime_ParseJson) {
HandleScope scope(isolate);
DCHECK(args.length() == 1);
CONVERT_ARG_HANDLE_CHECKED(String, source, 0);
source = String::Flatten(source);
// Optimized fast case where we only have Latin1 characters.
Handle<Object> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
source->IsSeqOneByteString()
? JsonParser<true>::Parse(source)
: JsonParser<false>::Parse(source));
return *result;
}
}
} // namespace v8::internal

1131
src/runtime/runtime-regexp.cc Normal file
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1252
src/runtime/runtime-strings.cc Normal file
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169
src/uri.h → src/runtime/runtime-uri.cc
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@ -1,20 +1,20 @@
// Copyright 2013 the V8 project authors. All rights reserved.
// Copyright 2014 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_URI_H_
#define V8_URI_H_
#include "src/v8.h"
#include "src/arguments.h"
#include "src/conversions.h"
#include "src/runtime/runtime.h"
#include "src/runtime/runtime-utils.h"
#include "src/string-search.h"
#include "src/utils.h"
namespace v8 {
namespace internal {
template <typename Char>
static INLINE(Vector<const Char> GetCharVector(Handle<String> string));
@ -37,42 +37,41 @@ Vector<const uc16> GetCharVector(Handle<String> string) {
class URIUnescape : public AllStatic {
public:
template<typename Char>
template <typename Char>
MUST_USE_RESULT static MaybeHandle<String> Unescape(Isolate* isolate,
Handle<String> source);
private:
static const signed char kHexValue['g'];
template<typename Char>
MUST_USE_RESULT static MaybeHandle<String> UnescapeSlow(
Isolate* isolate, Handle<String> string, int start_index);
template <typename Char>
MUST_USE_RESULT static MaybeHandle<String> UnescapeSlow(Isolate* isolate,
Handle<String> string,
int start_index);
static INLINE(int TwoDigitHex(uint16_t character1, uint16_t character2));
template <typename Char>
static INLINE(int UnescapeChar(Vector<const Char> vector,
int i,
int length,
static INLINE(int UnescapeChar(Vector<const Char> vector, int i, int length,
int* step));
};
const signed char URIUnescape::kHexValue[] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15 };
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -0, 1, 2, 3, 4, 5,
6, 7, 8, 9, -1, -1, -1, -1, -1, -1, -1, 10, 11, 12, 13, 14, 15, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, 10, 11, 12, 13, 14, 15};
template<typename Char>
template <typename Char>
MaybeHandle<String> URIUnescape::Unescape(Isolate* isolate,
Handle<String> source) {
int index;
{ DisallowHeapAllocation no_allocation;
{
DisallowHeapAllocation no_allocation;
StringSearch<uint8_t, Char> search(isolate, STATIC_CHAR_VECTOR("%"));
index = search.Search(GetCharVector<Char>(source), 0);
if (index < 0) return source;
@ -82,18 +81,20 @@ MaybeHandle<String> URIUnescape::Unescape(Isolate* isolate,
template <typename Char>
MaybeHandle<String> URIUnescape::UnescapeSlow(
Isolate* isolate, Handle<String> string, int start_index) {
MaybeHandle<String> URIUnescape::UnescapeSlow(Isolate* isolate,
Handle<String> string,
int start_index) {
bool one_byte = true;
int length = string->length();
int unescaped_length = 0;
{ DisallowHeapAllocation no_allocation;
{
DisallowHeapAllocation no_allocation;
Vector<const Char> vector = GetCharVector<Char>(string);
for (int i = start_index; i < length; unescaped_length++) {
int step;
if (UnescapeChar(vector, i, length, &step) >
String::kMaxOneByteCharCode) {
String::kMaxOneByteCharCode) {
one_byte = false;
}
i += step;
@ -108,8 +109,9 @@ MaybeHandle<String> URIUnescape::UnescapeSlow(
Handle<String> second_part;
DCHECK(unescaped_length <= String::kMaxLength);
if (one_byte) {
Handle<SeqOneByteString> dest = isolate->factory()->NewRawOneByteString(
unescaped_length).ToHandleChecked();
Handle<SeqOneByteString> dest = isolate->factory()
->NewRawOneByteString(unescaped_length)
.ToHandleChecked();
DisallowHeapAllocation no_allocation;
Vector<const Char> vector = GetCharVector<Char>(string);
for (int i = start_index; i < length; dest_position++) {
@ -120,8 +122,9 @@ MaybeHandle<String> URIUnescape::UnescapeSlow(
}
second_part = dest;
} else {
Handle<SeqTwoByteString> dest = isolate->factory()->NewRawTwoByteString(
unescaped_length).ToHandleChecked();
Handle<SeqTwoByteString> dest = isolate->factory()
->NewRawTwoByteString(unescaped_length)
.ToHandleChecked();
DisallowHeapAllocation no_allocation;
Vector<const Char> vector = GetCharVector<Char>(string);
for (int i = start_index; i < length; dest_position++) {
@ -148,26 +151,18 @@ int URIUnescape::TwoDigitHex(uint16_t character1, uint16_t character2) {
template <typename Char>
int URIUnescape::UnescapeChar(Vector<const Char> vector,
int i,
int length,
int URIUnescape::UnescapeChar(Vector<const Char> vector, int i, int length,
int* step) {
uint16_t character = vector[i];
int32_t hi = 0;
int32_t lo = 0;
if (character == '%' &&
i <= length - 6 &&
vector[i + 1] == 'u' &&
(hi = TwoDigitHex(vector[i + 2],
vector[i + 3])) != -1 &&
(lo = TwoDigitHex(vector[i + 4],
vector[i + 5])) != -1) {
if (character == '%' && i <= length - 6 && vector[i + 1] == 'u' &&
(hi = TwoDigitHex(vector[i + 2], vector[i + 3])) != -1 &&
(lo = TwoDigitHex(vector[i + 4], vector[i + 5])) != -1) {
*step = 6;
return (hi << 8) + lo;
} else if (character == '%' &&
i <= length - 3 &&
(lo = TwoDigitHex(vector[i + 1],
vector[i + 2])) != -1) {
} else if (character == '%' && i <= length - 3 &&
(lo = TwoDigitHex(vector[i + 1], vector[i + 2])) != -1) {
*step = 3;
return lo;
} else {
@ -179,7 +174,7 @@ int URIUnescape::UnescapeChar(Vector<const Char> vector,
class URIEscape : public AllStatic {
public:
template<typename Char>
template <typename Char>
MUST_USE_RESULT static MaybeHandle<String> Escape(Isolate* isolate,
Handle<String> string);
@ -206,31 +201,27 @@ const char URIEscape::kHexChars[] = "0123456789ABCDEF";
// }
const char URIEscape::kNotEscaped[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
template<typename Char>
template <typename Char>
MaybeHandle<String> URIEscape::Escape(Isolate* isolate, Handle<String> string) {
DCHECK(string->IsFlat());
int escaped_length = 0;
int length = string->length();
{ DisallowHeapAllocation no_allocation;
{
DisallowHeapAllocation no_allocation;
Vector<const Char> vector = GetCharVector<Char>(string);
for (int i = 0; i < length; i++) {
uint16_t c = vector[i];
@ -243,7 +234,7 @@ MaybeHandle<String> URIEscape::Escape(Isolate* isolate, Handle<String> string) {
}
// We don't allow strings that are longer than a maximal length.
DCHECK(String::kMaxLength < 0x7fffffff - 6); // Cannot overflow.
DCHECK(String::kMaxLength < 0x7fffffff - 6); // Cannot overflow.
if (escaped_length > String::kMaxLength) break; // Provoke exception.
}
}
@ -253,30 +244,30 @@ MaybeHandle<String> URIEscape::Escape(Isolate* isolate, Handle<String> string) {
Handle<SeqOneByteString> dest;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, dest,
isolate->factory()->NewRawOneByteString(escaped_length),
isolate, dest, isolate->factory()->NewRawOneByteString(escaped_length),
String);
int dest_position = 0;
{ DisallowHeapAllocation no_allocation;
{
DisallowHeapAllocation no_allocation;
Vector<const Char> vector = GetCharVector<Char>(string);
for (int i = 0; i < length; i++) {
uint16_t c = vector[i];
if (c >= 256) {
dest->SeqOneByteStringSet(dest_position, '%');
dest->SeqOneByteStringSet(dest_position+1, 'u');
dest->SeqOneByteStringSet(dest_position+2, kHexChars[c >> 12]);
dest->SeqOneByteStringSet(dest_position+3, kHexChars[(c >> 8) & 0xf]);
dest->SeqOneByteStringSet(dest_position+4, kHexChars[(c >> 4) & 0xf]);
dest->SeqOneByteStringSet(dest_position+5, kHexChars[c & 0xf]);
dest->SeqOneByteStringSet(dest_position + 1, 'u');
dest->SeqOneByteStringSet(dest_position + 2, kHexChars[c >> 12]);
dest->SeqOneByteStringSet(dest_position + 3, kHexChars[(c >> 8) & 0xf]);
dest->SeqOneByteStringSet(dest_position + 4, kHexChars[(c >> 4) & 0xf]);
dest->SeqOneByteStringSet(dest_position + 5, kHexChars[c & 0xf]);
dest_position += 6;
} else if (IsNotEscaped(c)) {
dest->SeqOneByteStringSet(dest_position, c);
dest_position++;
} else {
dest->SeqOneByteStringSet(dest_position, '%');
dest->SeqOneByteStringSet(dest_position+1, kHexChars[c >> 4]);
dest->SeqOneByteStringSet(dest_position+2, kHexChars[c & 0xf]);
dest->SeqOneByteStringSet(dest_position + 1, kHexChars[c >> 4]);
dest->SeqOneByteStringSet(dest_position + 2, kHexChars[c & 0xf]);
dest_position += 3;
}
}
@ -285,6 +276,34 @@ MaybeHandle<String> URIEscape::Escape(Isolate* isolate, Handle<String> string) {
return dest;
}
} } // namespace v8::internal
#endif // V8_URI_H_
RUNTIME_FUNCTION(Runtime_URIEscape) {
HandleScope scope(isolate);
DCHECK(args.length() == 1);
CONVERT_ARG_HANDLE_CHECKED(String, source, 0);
Handle<String> string = String::Flatten(source);
DCHECK(string->IsFlat());
Handle<String> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result, string->IsOneByteRepresentationUnderneath()
? URIEscape::Escape<uint8_t>(isolate, source)
: URIEscape::Escape<uc16>(isolate, source));
return *result;
}
RUNTIME_FUNCTION(Runtime_URIUnescape) {
HandleScope scope(isolate);
DCHECK(args.length() == 1);
CONVERT_ARG_HANDLE_CHECKED(String, source, 0);
Handle<String> string = String::Flatten(source);
DCHECK(string->IsFlat());
Handle<String> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, result, string->IsOneByteRepresentationUnderneath()
? URIUnescape::Unescape<uint8_t>(isolate, source)
: URIUnescape::Unescape<uc16>(isolate, source));
return *result;
}
}
} // namespace v8::internal

2719
src/runtime/runtime.cc
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2
src/runtime/runtime.h
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@ -822,8 +822,6 @@ class Runtime : public AllStatic {
static int StringMatch(Isolate* isolate, Handle<String> sub,
Handle<String> pat, int index);
static bool IsUpperCaseChar(RuntimeState* runtime_state, uint16_t ch);
// TODO(1240886): Some of the following methods are *not* handle safe, but
// accept handle arguments. This seems fragile.

296
src/runtime/string-builder.h Normal file
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@ -0,0 +1,296 @@
// Copyright 2014 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_STRING_BUILDER_H_
#define V8_STRING_BUILDER_H_
namespace v8 {
namespace internal {
const int kStringBuilderConcatHelperLengthBits = 11;
const int kStringBuilderConcatHelperPositionBits = 19;
typedef BitField<int, 0, kStringBuilderConcatHelperLengthBits>
StringBuilderSubstringLength;
typedef BitField<int, kStringBuilderConcatHelperLengthBits,
kStringBuilderConcatHelperPositionBits>
StringBuilderSubstringPosition;
template <typename sinkchar>
static inline void StringBuilderConcatHelper(String* special, sinkchar* sink,
FixedArray* fixed_array,
int array_length) {
DisallowHeapAllocation no_gc;
int position = 0;
for (int i = 0; i < array_length; i++) {
Object* element = fixed_array->get(i);
if (element->IsSmi()) {
// Smi encoding of position and length.
int encoded_slice = Smi::cast(element)->value();
int pos;
int len;
if (encoded_slice > 0) {
// Position and length encoded in one smi.
pos = StringBuilderSubstringPosition::decode(encoded_slice);
len = StringBuilderSubstringLength::decode(encoded_slice);
} else {
// Position and length encoded in two smis.
Object* obj = fixed_array->get(++i);
DCHECK(obj->IsSmi());
pos = Smi::cast(obj)->value();
len = -encoded_slice;
}
String::WriteToFlat(special, sink + position, pos, pos + len);
position += len;
} else {
String* string = String::cast(element);
int element_length = string->length();
String::WriteToFlat(string, sink + position, 0, element_length);
position += element_length;
}
}
}
// Returns the result length of the concatenation.
// On illegal argument, -1 is returned.
static inline int StringBuilderConcatLength(int special_length,
FixedArray* fixed_array,
int array_length, bool* one_byte) {
DisallowHeapAllocation no_gc;
int position = 0;
for (int i = 0; i < array_length; i++) {
int increment = 0;
Object* elt = fixed_array->get(i);
if (elt->IsSmi()) {
// Smi encoding of position and length.
int smi_value = Smi::cast(elt)->value();
int pos;
int len;
if (smi_value > 0) {
// Position and length encoded in one smi.
pos = StringBuilderSubstringPosition::decode(smi_value);
len = StringBuilderSubstringLength::decode(smi_value);
} else {
// Position and length encoded in two smis.
len = -smi_value;
// Get the position and check that it is a positive smi.
i++;
if (i >= array_length) return -1;
Object* next_smi = fixed_array->get(i);
if (!next_smi->IsSmi()) return -1;
pos = Smi::cast(next_smi)->value();
if (pos < 0) return -1;
}
DCHECK(pos >= 0);
DCHECK(len >= 0);
if (pos > special_length || len > special_length - pos) return -1;
increment = len;
} else if (elt->IsString()) {
String* element = String::cast(elt);
int element_length = element->length();
increment = element_length;
if (*one_byte && !element->HasOnlyOneByteChars()) {
*one_byte = false;
}
} else {
return -1;
}
if (increment > String::kMaxLength - position) {
return kMaxInt; // Provoke throw on allocation.
}
position += increment;
}
return position;
}
class FixedArrayBuilder {
public:
explicit FixedArrayBuilder(Isolate* isolate, int initial_capacity)
: array_(isolate->factory()->NewFixedArrayWithHoles(initial_capacity)),
length_(0),
has_non_smi_elements_(false) {
// Require a non-zero initial size. Ensures that doubling the size to
// extend the array will work.
DCHECK(initial_capacity > 0);
}
explicit FixedArrayBuilder(Handle<FixedArray> backing_store)
: array_(backing_store), length_(0), has_non_smi_elements_(false) {
// Require a non-zero initial size. Ensures that doubling the size to
// extend the array will work.
DCHECK(backing_store->length() > 0);
}
bool HasCapacity(int elements) {
int length = array_->length();
int required_length = length_ + elements;
return (length >= required_length);
}
void EnsureCapacity(int elements) {
int length = array_->length();
int required_length = length_ + elements;
if (length < required_length) {
int new_length = length;
do {
new_length *= 2;
} while (new_length < required_length);
Handle<FixedArray> extended_array =
array_->GetIsolate()->factory()->NewFixedArrayWithHoles(new_length);
array_->CopyTo(0, *extended_array, 0, length_);
array_ = extended_array;
}
}
void Add(Object* value) {
DCHECK(!value->IsSmi());
DCHECK(length_ < capacity());
array_->set(length_, value);
length_++;
has_non_smi_elements_ = true;
}
void Add(Smi* value) {
DCHECK(value->IsSmi());
DCHECK(length_ < capacity());
array_->set(length_, value);
length_++;
}
Handle<FixedArray> array() { return array_; }
int length() { return length_; }
int capacity() { return array_->length(); }
Handle<JSArray> ToJSArray(Handle<JSArray> target_array) {
JSArray::SetContent(target_array, array_);
target_array->set_length(Smi::FromInt(length_));
return target_array;
}
private:
Handle<FixedArray> array_;
int length_;
bool has_non_smi_elements_;
};
class ReplacementStringBuilder {
public:
ReplacementStringBuilder(Heap* heap, Handle<String> subject,
int estimated_part_count)
: heap_(heap),
array_builder_(heap->isolate(), estimated_part_count),
subject_(subject),
character_count_(0),
is_one_byte_(subject->IsOneByteRepresentation()) {
// Require a non-zero initial size. Ensures that doubling the size to
// extend the array will work.
DCHECK(estimated_part_count > 0);
}
static inline void AddSubjectSlice(FixedArrayBuilder* builder, int from,
int to) {
DCHECK(from >= 0);
int length = to - from;
DCHECK(length > 0);
if (StringBuilderSubstringLength::is_valid(length) &&
StringBuilderSubstringPosition::is_valid(from)) {
int encoded_slice = StringBuilderSubstringLength::encode(length) |
StringBuilderSubstringPosition::encode(from);
builder->Add(Smi::FromInt(encoded_slice));
} else {
// Otherwise encode as two smis.
builder->Add(Smi::FromInt(-length));
builder->Add(Smi::FromInt(from));
}
}
void EnsureCapacity(int elements) { array_builder_.EnsureCapacity(elements); }
void AddSubjectSlice(int from, int to) {
AddSubjectSlice(&array_builder_, from, to);
IncrementCharacterCount(to - from);
}
void AddString(Handle<String> string) {
int length = string->length();
DCHECK(length > 0);
AddElement(*string);
if (!string->IsOneByteRepresentation()) {
is_one_byte_ = false;
}
IncrementCharacterCount(length);
}
MaybeHandle<String> ToString() {
Isolate* isolate = heap_->isolate();
if (array_builder_.length() == 0) {
return isolate->factory()->empty_string();
}
Handle<String> joined_string;
if (is_one_byte_) {
Handle<SeqOneByteString> seq;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, seq,
isolate->factory()->NewRawOneByteString(character_count_), String);
DisallowHeapAllocation no_gc;
uint8_t* char_buffer = seq->GetChars();
StringBuilderConcatHelper(*subject_, char_buffer, *array_builder_.array(),
array_builder_.length());
joined_string = Handle<String>::cast(seq);
} else {
// Two-byte.
Handle<SeqTwoByteString> seq;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, seq,
isolate->factory()->NewRawTwoByteString(character_count_), String);
DisallowHeapAllocation no_gc;
uc16* char_buffer = seq->GetChars();
StringBuilderConcatHelper(*subject_, char_buffer, *array_builder_.array(),
array_builder_.length());
joined_string = Handle<String>::cast(seq);
}
return joined_string;
}
void IncrementCharacterCount(int by) {
if (character_count_ > String::kMaxLength - by) {
STATIC_ASSERT(String::kMaxLength < kMaxInt);
character_count_ = kMaxInt;
} else {
character_count_ += by;
}
}
private:
void AddElement(Object* element) {
DCHECK(element->IsSmi() || element->IsString());
DCHECK(array_builder_.capacity() > array_builder_.length());
array_builder_.Add(element);
}
Heap* heap_;
FixedArrayBuilder array_builder_;
Handle<String> subject_;
int character_count_;
bool is_one_byte_;
};
}
} // namespace v8::internal
#endif // V8_STRING_BUILDER_H_

5
tools/gyp/v8.gyp
View File

@ -732,9 +732,14 @@
'../../src/runtime-profiler.cc',
'../../src/runtime-profiler.h',
'../../src/runtime/runtime-i18n.cc',
'../../src/runtime/runtime-json.cc',
'../../src/runtime/runtime-regexp.cc',
'../../src/runtime/runtime-strings.cc',
'../../src/runtime/runtime-uri.cc',
'../../src/runtime/runtime-utils.h',
'../../src/runtime/runtime.cc',
'../../src/runtime/runtime.h',
'../../src/runtime/string-builder.h',
'../../src/safepoint-table.cc',
'../../src/safepoint-table.h',
'../../src/sampler.cc',