07d05dddce
BUG=v8:4724, v8:1543 LOG=N Review URL: https://codereview.chromium.org/1668853002 Cr-Commit-Position: refs/heads/master@{#33747}
688 lines
24 KiB
C++
688 lines
24 KiB
C++
// Copyright 2012 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_JSON_STRINGIFIER_H_
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#define V8_JSON_STRINGIFIER_H_
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#include "src/conversions.h"
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#include "src/lookup.h"
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#include "src/messages.h"
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#include "src/string-builder.h"
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#include "src/utils.h"
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namespace v8 {
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namespace internal {
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class BasicJsonStringifier BASE_EMBEDDED {
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public:
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explicit BasicJsonStringifier(Isolate* isolate);
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MUST_USE_RESULT MaybeHandle<Object> Stringify(Handle<Object> object);
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MUST_USE_RESULT INLINE(static MaybeHandle<Object> StringifyString(
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Isolate* isolate,
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Handle<String> object));
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private:
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enum Result { UNCHANGED, SUCCESS, EXCEPTION };
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MUST_USE_RESULT MaybeHandle<Object> ApplyToJsonFunction(
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Handle<Object> object,
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Handle<Object> key);
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Result SerializeGeneric(Handle<Object> object,
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Handle<Object> key,
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bool deferred_comma,
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bool deferred_key);
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// Entry point to serialize the object.
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INLINE(Result SerializeObject(Handle<Object> obj)) {
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return Serialize_<false>(obj, false, factory()->empty_string());
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}
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// Serialize an array element.
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// The index may serve as argument for the toJSON function.
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INLINE(Result SerializeElement(Isolate* isolate,
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Handle<Object> object,
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int i)) {
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return Serialize_<false>(object,
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false,
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Handle<Object>(Smi::FromInt(i), isolate));
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}
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// Serialize a object property.
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// The key may or may not be serialized depending on the property.
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// The key may also serve as argument for the toJSON function.
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INLINE(Result SerializeProperty(Handle<Object> object,
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bool deferred_comma,
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Handle<String> deferred_key)) {
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DCHECK(!deferred_key.is_null());
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return Serialize_<true>(object, deferred_comma, deferred_key);
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}
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template <bool deferred_string_key>
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Result Serialize_(Handle<Object> object, bool comma, Handle<Object> key);
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void SerializeDeferredKey(bool deferred_comma, Handle<Object> deferred_key) {
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if (deferred_comma) builder_.AppendCharacter(',');
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SerializeString(Handle<String>::cast(deferred_key));
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builder_.AppendCharacter(':');
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}
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Result SerializeSmi(Smi* object);
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Result SerializeDouble(double number);
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INLINE(Result SerializeHeapNumber(Handle<HeapNumber> object)) {
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return SerializeDouble(object->value());
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}
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Result SerializeJSValue(Handle<JSValue> object);
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INLINE(Result SerializeJSArray(Handle<JSArray> object));
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INLINE(Result SerializeJSObject(Handle<JSObject> object));
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Result SerializeJSArraySlow(Handle<JSArray> object, uint32_t start,
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uint32_t length);
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void SerializeString(Handle<String> object);
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template <typename SrcChar, typename DestChar>
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INLINE(static void SerializeStringUnchecked_(
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Vector<const SrcChar> src,
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IncrementalStringBuilder::NoExtend<DestChar>* dest));
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template <typename SrcChar, typename DestChar>
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INLINE(void SerializeString_(Handle<String> string));
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template <typename Char>
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INLINE(static bool DoNotEscape(Char c));
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Result StackPush(Handle<Object> object);
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void StackPop();
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Factory* factory() { return isolate_->factory(); }
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Isolate* isolate_;
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IncrementalStringBuilder builder_;
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Handle<String> tojson_string_;
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Handle<JSArray> stack_;
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static const int kJsonEscapeTableEntrySize = 8;
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static const char* const JsonEscapeTable;
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};
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// Translation table to escape Latin1 characters.
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// Table entries start at a multiple of 8 and are null-terminated.
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const char* const BasicJsonStringifier::JsonEscapeTable =
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"\\u0000\0 \\u0001\0 \\u0002\0 \\u0003\0 "
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"\\u0004\0 \\u0005\0 \\u0006\0 \\u0007\0 "
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"\\b\0 \\t\0 \\n\0 \\u000b\0 "
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"\\f\0 \\r\0 \\u000e\0 \\u000f\0 "
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"\\u0010\0 \\u0011\0 \\u0012\0 \\u0013\0 "
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"\\u0014\0 \\u0015\0 \\u0016\0 \\u0017\0 "
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"\\u0018\0 \\u0019\0 \\u001a\0 \\u001b\0 "
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"\\u001c\0 \\u001d\0 \\u001e\0 \\u001f\0 "
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" \0 !\0 \\\"\0 #\0 "
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"$\0 %\0 &\0 '\0 "
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"(\0 )\0 *\0 +\0 "
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",\0 -\0 .\0 /\0 "
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"0\0 1\0 2\0 3\0 "
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"4\0 5\0 6\0 7\0 "
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"8\0 9\0 :\0 ;\0 "
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"<\0 =\0 >\0 ?\0 "
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"@\0 A\0 B\0 C\0 "
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"D\0 E\0 F\0 G\0 "
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"H\0 I\0 J\0 K\0 "
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"L\0 M\0 N\0 O\0 "
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"P\0 Q\0 R\0 S\0 "
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"T\0 U\0 V\0 W\0 "
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"X\0 Y\0 Z\0 [\0 "
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"\\\\\0 ]\0 ^\0 _\0 "
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"`\0 a\0 b\0 c\0 "
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"d\0 e\0 f\0 g\0 "
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"h\0 i\0 j\0 k\0 "
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"l\0 m\0 n\0 o\0 "
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"p\0 q\0 r\0 s\0 "
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"t\0 u\0 v\0 w\0 "
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"x\0 y\0 z\0 {\0 "
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"|\0 }\0 ~\0 \177\0 "
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"\200\0 \201\0 \202\0 \203\0 "
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"\204\0 \205\0 \206\0 \207\0 "
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"\210\0 \211\0 \212\0 \213\0 "
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"\214\0 \215\0 \216\0 \217\0 "
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"\220\0 \221\0 \222\0 \223\0 "
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"\224\0 \225\0 \226\0 \227\0 "
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"\230\0 \231\0 \232\0 \233\0 "
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"\234\0 \235\0 \236\0 \237\0 "
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"\240\0 \241\0 \242\0 \243\0 "
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"\244\0 \245\0 \246\0 \247\0 "
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"\250\0 \251\0 \252\0 \253\0 "
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"\254\0 \255\0 \256\0 \257\0 "
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"\260\0 \261\0 \262\0 \263\0 "
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"\264\0 \265\0 \266\0 \267\0 "
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"\270\0 \271\0 \272\0 \273\0 "
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"\274\0 \275\0 \276\0 \277\0 "
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"\300\0 \301\0 \302\0 \303\0 "
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"\304\0 \305\0 \306\0 \307\0 "
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"\310\0 \311\0 \312\0 \313\0 "
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"\314\0 \315\0 \316\0 \317\0 "
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"\320\0 \321\0 \322\0 \323\0 "
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"\324\0 \325\0 \326\0 \327\0 "
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"\330\0 \331\0 \332\0 \333\0 "
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"\334\0 \335\0 \336\0 \337\0 "
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"\340\0 \341\0 \342\0 \343\0 "
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"\344\0 \345\0 \346\0 \347\0 "
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"\350\0 \351\0 \352\0 \353\0 "
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"\354\0 \355\0 \356\0 \357\0 "
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"\360\0 \361\0 \362\0 \363\0 "
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"\364\0 \365\0 \366\0 \367\0 "
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"\370\0 \371\0 \372\0 \373\0 "
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"\374\0 \375\0 \376\0 \377\0 ";
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BasicJsonStringifier::BasicJsonStringifier(Isolate* isolate)
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: isolate_(isolate), builder_(isolate) {
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tojson_string_ = factory()->toJSON_string();
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stack_ = factory()->NewJSArray(8);
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}
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MaybeHandle<Object> BasicJsonStringifier::Stringify(Handle<Object> object) {
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Result result = SerializeObject(object);
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if (result == UNCHANGED) return factory()->undefined_value();
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if (result == SUCCESS) return builder_.Finish();
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DCHECK(result == EXCEPTION);
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return MaybeHandle<Object>();
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}
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MaybeHandle<Object> BasicJsonStringifier::StringifyString(
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Isolate* isolate, Handle<String> object) {
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static const int kJsonQuoteWorstCaseBlowup = 6;
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static const int kSpaceForQuotes = 2;
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int worst_case_length =
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object->length() * kJsonQuoteWorstCaseBlowup + kSpaceForQuotes;
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if (worst_case_length > 32 * KB) { // Slow path if too large.
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BasicJsonStringifier stringifier(isolate);
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return stringifier.Stringify(object);
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}
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object = String::Flatten(object);
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DCHECK(object->IsFlat());
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Handle<SeqString> result;
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if (object->IsOneByteRepresentationUnderneath()) {
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result = isolate->factory()
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->NewRawOneByteString(worst_case_length)
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.ToHandleChecked();
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IncrementalStringBuilder::NoExtendString<uint8_t> no_extend(
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result, worst_case_length);
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no_extend.Append('\"');
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SerializeStringUnchecked_(object->GetFlatContent().ToOneByteVector(),
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&no_extend);
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no_extend.Append('\"');
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return no_extend.Finalize();
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} else {
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result = isolate->factory()
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->NewRawTwoByteString(worst_case_length)
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.ToHandleChecked();
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IncrementalStringBuilder::NoExtendString<uc16> no_extend(result,
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worst_case_length);
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no_extend.Append('\"');
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SerializeStringUnchecked_(object->GetFlatContent().ToUC16Vector(),
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&no_extend);
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no_extend.Append('\"');
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return no_extend.Finalize();
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}
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}
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MaybeHandle<Object> BasicJsonStringifier::ApplyToJsonFunction(
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Handle<Object> object, Handle<Object> key) {
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LookupIterator it(object, tojson_string_,
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LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR);
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Handle<Object> fun;
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ASSIGN_RETURN_ON_EXCEPTION(isolate_, fun, Object::GetProperty(&it), Object);
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if (!fun->IsJSFunction()) return object;
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// Call toJSON function.
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if (key->IsSmi()) key = factory()->NumberToString(key);
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Handle<Object> argv[] = { key };
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HandleScope scope(isolate_);
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ASSIGN_RETURN_ON_EXCEPTION(
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isolate_, object,
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Execution::Call(isolate_, fun, object, 1, argv),
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Object);
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return scope.CloseAndEscape(object);
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}
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BasicJsonStringifier::Result BasicJsonStringifier::StackPush(
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Handle<Object> object) {
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StackLimitCheck check(isolate_);
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if (check.HasOverflowed()) {
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isolate_->StackOverflow();
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return EXCEPTION;
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}
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int length = Smi::cast(stack_->length())->value();
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{
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DisallowHeapAllocation no_allocation;
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FixedArray* elements = FixedArray::cast(stack_->elements());
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for (int i = 0; i < length; i++) {
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if (elements->get(i) == *object) {
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AllowHeapAllocation allow_to_return_error;
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Handle<Object> error =
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factory()->NewTypeError(MessageTemplate::kCircularStructure);
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isolate_->Throw(*error);
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return EXCEPTION;
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}
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}
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}
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JSArray::SetLength(stack_, length + 1);
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FixedArray::cast(stack_->elements())->set(length, *object);
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return SUCCESS;
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}
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void BasicJsonStringifier::StackPop() {
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int length = Smi::cast(stack_->length())->value();
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stack_->set_length(Smi::FromInt(length - 1));
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}
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template <bool deferred_string_key>
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BasicJsonStringifier::Result BasicJsonStringifier::Serialize_(
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Handle<Object> object, bool comma, Handle<Object> key) {
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if (object->IsJSObject()) {
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(
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isolate_, object,
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ApplyToJsonFunction(object, key),
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EXCEPTION);
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}
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if (object->IsSmi()) {
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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return SerializeSmi(Smi::cast(*object));
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}
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switch (HeapObject::cast(*object)->map()->instance_type()) {
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case HEAP_NUMBER_TYPE:
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case MUTABLE_HEAP_NUMBER_TYPE:
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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return SerializeHeapNumber(Handle<HeapNumber>::cast(object));
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case ODDBALL_TYPE:
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switch (Oddball::cast(*object)->kind()) {
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case Oddball::kFalse:
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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builder_.AppendCString("false");
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return SUCCESS;
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case Oddball::kTrue:
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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builder_.AppendCString("true");
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return SUCCESS;
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case Oddball::kNull:
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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builder_.AppendCString("null");
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return SUCCESS;
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default:
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return UNCHANGED;
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}
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case JS_ARRAY_TYPE:
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if (object->IsAccessCheckNeeded()) break;
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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return SerializeJSArray(Handle<JSArray>::cast(object));
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case JS_VALUE_TYPE:
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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return SerializeJSValue(Handle<JSValue>::cast(object));
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default:
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if (object->IsString()) {
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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SerializeString(Handle<String>::cast(object));
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return SUCCESS;
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} else if (object->IsJSObject()) {
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if (object->IsCallable()) return UNCHANGED;
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// Go to slow path for global proxy and objects requiring access checks.
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if (object->IsAccessCheckNeeded() || object->IsJSGlobalProxy()) break;
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if (deferred_string_key) SerializeDeferredKey(comma, key);
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return SerializeJSObject(Handle<JSObject>::cast(object));
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}
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}
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return SerializeGeneric(object, key, comma, deferred_string_key);
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}
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BasicJsonStringifier::Result BasicJsonStringifier::SerializeGeneric(
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Handle<Object> object,
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Handle<Object> key,
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bool deferred_comma,
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bool deferred_key) {
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Handle<JSFunction> fun = isolate_->json_serialize_adapter();
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Handle<Object> argv[] = { key, object };
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Handle<Object> result;
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(
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isolate_, result, Execution::Call(isolate_, fun, object, 2, argv),
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EXCEPTION);
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if (result->IsUndefined()) return UNCHANGED;
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if (deferred_key) {
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if (key->IsSmi()) key = factory()->NumberToString(key);
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SerializeDeferredKey(deferred_comma, key);
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}
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builder_.AppendString(Handle<String>::cast(result));
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return SUCCESS;
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}
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BasicJsonStringifier::Result BasicJsonStringifier::SerializeJSValue(
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Handle<JSValue> object) {
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String* class_name = object->class_name();
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if (class_name == isolate_->heap()->String_string()) {
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Handle<Object> value;
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(
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isolate_, value, Object::ToString(isolate_, object), EXCEPTION);
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SerializeString(Handle<String>::cast(value));
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} else if (class_name == isolate_->heap()->Number_string()) {
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Handle<Object> value;
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ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate_, value, Object::ToNumber(object),
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EXCEPTION);
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if (value->IsSmi()) return SerializeSmi(Smi::cast(*value));
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SerializeHeapNumber(Handle<HeapNumber>::cast(value));
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} else if (class_name == isolate_->heap()->Boolean_string()) {
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Object* value = JSValue::cast(*object)->value();
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DCHECK(value->IsBoolean());
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builder_.AppendCString(value->IsTrue() ? "true" : "false");
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} else {
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// ES6 24.3.2.1 step 10.c, serialize as an ordinary JSObject.
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CHECK(!object->IsAccessCheckNeeded());
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CHECK(!object->IsJSGlobalProxy());
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return SerializeJSObject(object);
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}
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return SUCCESS;
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}
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BasicJsonStringifier::Result BasicJsonStringifier::SerializeSmi(Smi* object) {
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static const int kBufferSize = 100;
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char chars[kBufferSize];
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Vector<char> buffer(chars, kBufferSize);
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builder_.AppendCString(IntToCString(object->value(), buffer));
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return SUCCESS;
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}
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BasicJsonStringifier::Result BasicJsonStringifier::SerializeDouble(
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double number) {
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if (std::isinf(number) || std::isnan(number)) {
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builder_.AppendCString("null");
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return SUCCESS;
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}
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static const int kBufferSize = 100;
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char chars[kBufferSize];
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Vector<char> buffer(chars, kBufferSize);
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builder_.AppendCString(DoubleToCString(number, buffer));
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return SUCCESS;
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}
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BasicJsonStringifier::Result BasicJsonStringifier::SerializeJSArray(
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Handle<JSArray> object) {
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HandleScope handle_scope(isolate_);
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Result stack_push = StackPush(object);
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if (stack_push != SUCCESS) return stack_push;
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uint32_t length = 0;
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CHECK(object->length()->ToArrayLength(&length));
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builder_.AppendCharacter('[');
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switch (object->GetElementsKind()) {
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case FAST_SMI_ELEMENTS: {
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Handle<FixedArray> elements(FixedArray::cast(object->elements()),
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isolate_);
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for (uint32_t i = 0; i < length; i++) {
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if (i > 0) builder_.AppendCharacter(',');
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SerializeSmi(Smi::cast(elements->get(i)));
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}
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break;
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}
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case FAST_DOUBLE_ELEMENTS: {
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// Empty array is FixedArray but not FixedDoubleArray.
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if (length == 0) break;
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Handle<FixedDoubleArray> elements(
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FixedDoubleArray::cast(object->elements()), isolate_);
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for (uint32_t i = 0; i < length; i++) {
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if (i > 0) builder_.AppendCharacter(',');
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SerializeDouble(elements->get_scalar(i));
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}
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break;
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}
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case FAST_ELEMENTS: {
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Handle<Object> old_length(object->length(), isolate_);
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for (uint32_t i = 0; i < length; i++) {
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if (object->length() != *old_length ||
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object->GetElementsKind() != FAST_ELEMENTS) {
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Result result = SerializeJSArraySlow(object, i, length);
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if (result != SUCCESS) return result;
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break;
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}
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if (i > 0) builder_.AppendCharacter(',');
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Result result = SerializeElement(
|
|
isolate_,
|
|
Handle<Object>(FixedArray::cast(object->elements())->get(i),
|
|
isolate_),
|
|
i);
|
|
if (result == SUCCESS) continue;
|
|
if (result == UNCHANGED) {
|
|
builder_.AppendCString("null");
|
|
} else {
|
|
return result;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
// The FAST_HOLEY_* cases could be handled in a faster way. They resemble
|
|
// the non-holey cases except that a lookup is necessary for holes.
|
|
default: {
|
|
Result result = SerializeJSArraySlow(object, 0, length);
|
|
if (result != SUCCESS) return result;
|
|
break;
|
|
}
|
|
}
|
|
builder_.AppendCharacter(']');
|
|
StackPop();
|
|
return SUCCESS;
|
|
}
|
|
|
|
|
|
BasicJsonStringifier::Result BasicJsonStringifier::SerializeJSArraySlow(
|
|
Handle<JSArray> object, uint32_t start, uint32_t length) {
|
|
for (uint32_t i = start; i < length; i++) {
|
|
if (i > 0) builder_.AppendCharacter(',');
|
|
Handle<Object> element;
|
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
|
isolate_, element,
|
|
Object::GetElement(isolate_, object, i),
|
|
EXCEPTION);
|
|
if (element->IsUndefined()) {
|
|
builder_.AppendCString("null");
|
|
} else {
|
|
Result result = SerializeElement(isolate_, element, i);
|
|
if (result == SUCCESS) continue;
|
|
if (result == UNCHANGED) {
|
|
builder_.AppendCString("null");
|
|
} else {
|
|
return result;
|
|
}
|
|
}
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
|
|
BasicJsonStringifier::Result BasicJsonStringifier::SerializeJSObject(
|
|
Handle<JSObject> object) {
|
|
HandleScope handle_scope(isolate_);
|
|
Result stack_push = StackPush(object);
|
|
if (stack_push != SUCCESS) return stack_push;
|
|
DCHECK(!object->IsJSGlobalProxy() && !object->IsJSGlobalObject());
|
|
|
|
builder_.AppendCharacter('{');
|
|
bool comma = false;
|
|
|
|
if (object->HasFastProperties() &&
|
|
!object->HasIndexedInterceptor() &&
|
|
!object->HasNamedInterceptor() &&
|
|
object->elements()->length() == 0) {
|
|
Handle<Map> map(object->map());
|
|
for (int i = 0; i < map->NumberOfOwnDescriptors(); i++) {
|
|
Handle<Name> name(map->instance_descriptors()->GetKey(i), isolate_);
|
|
// TODO(rossberg): Should this throw?
|
|
if (!name->IsString()) continue;
|
|
Handle<String> key = Handle<String>::cast(name);
|
|
PropertyDetails details = map->instance_descriptors()->GetDetails(i);
|
|
if (details.IsDontEnum()) continue;
|
|
Handle<Object> property;
|
|
if (details.type() == DATA && *map == object->map()) {
|
|
FieldIndex field_index = FieldIndex::ForDescriptor(*map, i);
|
|
Isolate* isolate = object->GetIsolate();
|
|
if (object->IsUnboxedDoubleField(field_index)) {
|
|
double value = object->RawFastDoublePropertyAt(field_index);
|
|
property = isolate->factory()->NewHeapNumber(value);
|
|
|
|
} else {
|
|
property = handle(object->RawFastPropertyAt(field_index), isolate);
|
|
}
|
|
} else {
|
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
|
isolate_, property,
|
|
Object::GetPropertyOrElement(object, key),
|
|
EXCEPTION);
|
|
}
|
|
Result result = SerializeProperty(property, comma, key);
|
|
if (!comma && result == SUCCESS) comma = true;
|
|
if (result == EXCEPTION) return result;
|
|
}
|
|
} else {
|
|
Handle<FixedArray> contents;
|
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
|
isolate_, contents,
|
|
JSReceiver::GetKeys(object, OWN_ONLY, ENUMERABLE_STRINGS), EXCEPTION);
|
|
|
|
for (int i = 0; i < contents->length(); i++) {
|
|
Object* key = contents->get(i);
|
|
Handle<String> key_handle;
|
|
MaybeHandle<Object> maybe_property;
|
|
if (key->IsString()) {
|
|
key_handle = Handle<String>(String::cast(key), isolate_);
|
|
maybe_property = Object::GetPropertyOrElement(object, key_handle);
|
|
} else {
|
|
DCHECK(key->IsNumber());
|
|
key_handle = factory()->NumberToString(Handle<Object>(key, isolate_));
|
|
if (key->IsSmi()) {
|
|
maybe_property = Object::GetElement(
|
|
isolate_, object, Smi::cast(key)->value());
|
|
} else {
|
|
maybe_property = Object::GetPropertyOrElement(object, key_handle);
|
|
}
|
|
}
|
|
Handle<Object> property;
|
|
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
|
|
isolate_, property, maybe_property, EXCEPTION);
|
|
Result result = SerializeProperty(property, comma, key_handle);
|
|
if (!comma && result == SUCCESS) comma = true;
|
|
if (result == EXCEPTION) return result;
|
|
}
|
|
}
|
|
|
|
builder_.AppendCharacter('}');
|
|
StackPop();
|
|
return SUCCESS;
|
|
}
|
|
|
|
|
|
template <typename SrcChar, typename DestChar>
|
|
void BasicJsonStringifier::SerializeStringUnchecked_(
|
|
Vector<const SrcChar> src,
|
|
IncrementalStringBuilder::NoExtend<DestChar>* dest) {
|
|
// Assert that uc16 character is not truncated down to 8 bit.
|
|
// The <uc16, char> version of this method must not be called.
|
|
DCHECK(sizeof(DestChar) >= sizeof(SrcChar));
|
|
|
|
for (int i = 0; i < src.length(); i++) {
|
|
SrcChar c = src[i];
|
|
if (DoNotEscape(c)) {
|
|
dest->Append(c);
|
|
} else {
|
|
dest->AppendCString(&JsonEscapeTable[c * kJsonEscapeTableEntrySize]);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
template <typename SrcChar, typename DestChar>
|
|
void BasicJsonStringifier::SerializeString_(Handle<String> string) {
|
|
int length = string->length();
|
|
builder_.Append<uint8_t, DestChar>('"');
|
|
// We make a rough estimate to find out if the current string can be
|
|
// serialized without allocating a new string part. The worst case length of
|
|
// an escaped character is 6. Shifting the remainin string length right by 3
|
|
// is a more pessimistic estimate, but faster to calculate.
|
|
int worst_case_length = length << 3;
|
|
if (builder_.CurrentPartCanFit(worst_case_length)) {
|
|
DisallowHeapAllocation no_gc;
|
|
Vector<const SrcChar> vector = string->GetCharVector<SrcChar>();
|
|
IncrementalStringBuilder::NoExtendBuilder<DestChar> no_extend(
|
|
&builder_, worst_case_length);
|
|
SerializeStringUnchecked_(vector, &no_extend);
|
|
} else {
|
|
FlatStringReader reader(isolate_, string);
|
|
for (int i = 0; i < reader.length(); i++) {
|
|
SrcChar c = reader.Get<SrcChar>(i);
|
|
if (DoNotEscape(c)) {
|
|
builder_.Append<SrcChar, DestChar>(c);
|
|
} else {
|
|
builder_.AppendCString(&JsonEscapeTable[c * kJsonEscapeTableEntrySize]);
|
|
}
|
|
}
|
|
}
|
|
|
|
builder_.Append<uint8_t, DestChar>('"');
|
|
}
|
|
|
|
|
|
template <>
|
|
bool BasicJsonStringifier::DoNotEscape(uint8_t c) {
|
|
return c >= '#' && c <= '~' && c != '\\';
|
|
}
|
|
|
|
|
|
template <>
|
|
bool BasicJsonStringifier::DoNotEscape(uint16_t c) {
|
|
return c >= '#' && c != '\\' && c != 0x7f;
|
|
}
|
|
|
|
|
|
void BasicJsonStringifier::SerializeString(Handle<String> object) {
|
|
object = String::Flatten(object);
|
|
if (builder_.CurrentEncoding() == String::ONE_BYTE_ENCODING) {
|
|
if (object->IsOneByteRepresentationUnderneath()) {
|
|
SerializeString_<uint8_t, uint8_t>(object);
|
|
} else {
|
|
builder_.ChangeEncoding();
|
|
SerializeString(object);
|
|
}
|
|
} else {
|
|
if (object->IsOneByteRepresentationUnderneath()) {
|
|
SerializeString_<uint8_t, uc16>(object);
|
|
} else {
|
|
SerializeString_<uc16, uc16>(object);
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace internal
|
|
} // namespace v8
|
|
|
|
#endif // V8_JSON_STRINGIFIER_H_
|