mirror of
https://github.com/dart-lang/sdk
synced 2024-09-04 16:03:44 +00:00
[vm] Speed up JSON encoding.
TEST=ci Change-Id: I8bfe00472f3a5e4e6680de631072cea0dacc3f55 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/283980 Reviewed-by: Ben Konyi <bkonyi@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
This commit is contained in:
parent
004b400dfb
commit
f56c45eb37
|
@ -62,42 +62,186 @@ void BaseTextBuffer::AddRaw(const uint8_t* buffer, intptr_t buffer_length) {
|
|||
buffer_[length_] = '\0';
|
||||
}
|
||||
|
||||
// Write a UTF-32 code unit so it can be read by a JSON parser in a string
|
||||
// literal. Use official encoding from JSON specification. http://json.org/
|
||||
void BaseTextBuffer::EscapeAndAddCodeUnit(uint32_t codeunit) {
|
||||
void BaseTextBuffer::AddEscapedUTF8(const char* const s, intptr_t len) {
|
||||
const uint8_t* cursor = reinterpret_cast<const uint8_t*>(s);
|
||||
const uint8_t* end = cursor + len;
|
||||
|
||||
intptr_t needed = 0;
|
||||
while (cursor < end) {
|
||||
uint8_t codeunit = *cursor++;
|
||||
if (codeunit >= 0x80) {
|
||||
needed += 1;
|
||||
} else {
|
||||
needed += EscapedCodeUnitLength(codeunit);
|
||||
}
|
||||
}
|
||||
|
||||
if (!EnsureCapacity(needed)) return;
|
||||
|
||||
cursor = reinterpret_cast<const uint8_t*>(s);
|
||||
while (cursor < end) {
|
||||
uint8_t codeunit = *cursor++;
|
||||
if (codeunit >= 0x80) {
|
||||
buffer_[length_++] = codeunit;
|
||||
} else {
|
||||
EscapeAndAddCodeUnit(codeunit);
|
||||
}
|
||||
}
|
||||
buffer_[length_] = '\0';
|
||||
}
|
||||
|
||||
void BaseTextBuffer::AddEscapedLatin1(const uint8_t* const s, intptr_t len) {
|
||||
const uint8_t* cursor = s;
|
||||
const uint8_t* end = cursor + len;
|
||||
|
||||
intptr_t needed = 0;
|
||||
while (cursor < end) {
|
||||
needed += EscapedCodeUnitLength(*cursor++);
|
||||
}
|
||||
|
||||
if (!EnsureCapacity(needed)) return;
|
||||
|
||||
cursor = s;
|
||||
while (cursor < end) {
|
||||
EscapeAndAddCodeUnit(*cursor++);
|
||||
}
|
||||
buffer_[length_] = '\0';
|
||||
}
|
||||
|
||||
void BaseTextBuffer::AddEscapedUTF16(const uint16_t* s, intptr_t len) {
|
||||
for (const uint16_t* end = s + len; s < end; s++) {
|
||||
if (!EnsureCapacity(6)) return;
|
||||
|
||||
uint16_t code_unit = *s;
|
||||
if (Utf16::IsTrailSurrogate(code_unit)) {
|
||||
EscapeAndAddUTF16CodeUnit(code_unit);
|
||||
} else if (Utf16::IsLeadSurrogate(code_unit)) {
|
||||
if (s + 1 == end) {
|
||||
EscapeAndAddUTF16CodeUnit(code_unit);
|
||||
} else {
|
||||
uint16_t next_code_unit = *(s + 1);
|
||||
if (Utf16::IsTrailSurrogate(next_code_unit)) {
|
||||
uint32_t decoded = Utf16::Decode(code_unit, next_code_unit);
|
||||
EscapeAndAddCodeUnit(decoded);
|
||||
s++;
|
||||
} else {
|
||||
EscapeAndAddUTF16CodeUnit(code_unit);
|
||||
}
|
||||
}
|
||||
} else {
|
||||
EscapeAndAddCodeUnit(code_unit);
|
||||
}
|
||||
}
|
||||
buffer_[length_] = '\0';
|
||||
}
|
||||
|
||||
DART_FORCE_INLINE
|
||||
intptr_t BaseTextBuffer::EscapedCodeUnitLength(uint32_t codeunit) {
|
||||
switch (codeunit) {
|
||||
case '"':
|
||||
AddRaw(reinterpret_cast<uint8_t const*>("\\\""), 2);
|
||||
break;
|
||||
case '\\':
|
||||
AddRaw(reinterpret_cast<uint8_t const*>("\\\\"), 2);
|
||||
break;
|
||||
case '/':
|
||||
AddRaw(reinterpret_cast<uint8_t const*>("\\/"), 2);
|
||||
break;
|
||||
case '\b':
|
||||
AddRaw(reinterpret_cast<uint8_t const*>("\\b"), 2);
|
||||
break;
|
||||
case '\f':
|
||||
AddRaw(reinterpret_cast<uint8_t const*>("\\f"), 2);
|
||||
break;
|
||||
case '\n':
|
||||
AddRaw(reinterpret_cast<uint8_t const*>("\\n"), 2);
|
||||
break;
|
||||
case '\r':
|
||||
AddRaw(reinterpret_cast<uint8_t const*>("\\r"), 2);
|
||||
break;
|
||||
case '\t':
|
||||
AddRaw(reinterpret_cast<uint8_t const*>("\\t"), 2);
|
||||
break;
|
||||
return 2;
|
||||
default:
|
||||
if (codeunit < 0x20) {
|
||||
EscapeAndAddUTF16CodeUnit(codeunit);
|
||||
return 6;
|
||||
} else if (codeunit <= Utf8::kMaxOneByteChar) {
|
||||
return 1;
|
||||
} else if (codeunit <= Utf8::kMaxTwoByteChar) {
|
||||
return 2;
|
||||
} else if (codeunit <= Utf8::kMaxThreeByteChar) {
|
||||
return 3;
|
||||
} else {
|
||||
char encoded[6];
|
||||
intptr_t length = Utf8::Length(codeunit);
|
||||
Utf8::Encode(codeunit, encoded);
|
||||
AddRaw(reinterpret_cast<uint8_t const*>(encoded), length);
|
||||
ASSERT(codeunit <= Utf8::kMaxFourByteChar);
|
||||
return 4;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static uint8_t Hex(uint8_t value) {
|
||||
return value < 10 ? '0' + value : 'A' + value - 10;
|
||||
}
|
||||
|
||||
// Write a UTF-32 code unit so it can be read by a JSON parser in a string
|
||||
// literal. Use official encoding from JSON specification. http://json.org/
|
||||
DART_FORCE_INLINE
|
||||
void BaseTextBuffer::EscapeAndAddCodeUnit(uint32_t codeunit) {
|
||||
intptr_t remaining = capacity_ - length_;
|
||||
switch (codeunit) {
|
||||
case '"':
|
||||
ASSERT(remaining > 2);
|
||||
buffer_[length_++] = '\\';
|
||||
buffer_[length_++] = '\"';
|
||||
break;
|
||||
case '\\':
|
||||
ASSERT(remaining > 2);
|
||||
buffer_[length_++] = '\\';
|
||||
buffer_[length_++] = '\\';
|
||||
break;
|
||||
case '/':
|
||||
ASSERT(remaining > 2);
|
||||
buffer_[length_++] = '\\';
|
||||
buffer_[length_++] = '/';
|
||||
break;
|
||||
case '\b':
|
||||
ASSERT(remaining > 2);
|
||||
buffer_[length_++] = '\\';
|
||||
buffer_[length_++] = 'b';
|
||||
break;
|
||||
case '\f':
|
||||
ASSERT(remaining > 2);
|
||||
buffer_[length_++] = '\\';
|
||||
buffer_[length_++] = 'f';
|
||||
break;
|
||||
case '\n':
|
||||
ASSERT(remaining > 2);
|
||||
buffer_[length_++] = '\\';
|
||||
buffer_[length_++] = 'n';
|
||||
break;
|
||||
case '\r':
|
||||
ASSERT(remaining > 2);
|
||||
buffer_[length_++] = '\\';
|
||||
buffer_[length_++] = 'r';
|
||||
break;
|
||||
case '\t':
|
||||
ASSERT(remaining > 2);
|
||||
buffer_[length_++] = '\\';
|
||||
buffer_[length_++] = 't';
|
||||
break;
|
||||
default:
|
||||
static constexpr int kMask = ~(1 << 6);
|
||||
if (codeunit < 0x20) {
|
||||
ASSERT(remaining > 6);
|
||||
buffer_[length_++] = '\\';
|
||||
buffer_[length_++] = 'u';
|
||||
buffer_[length_++] = Hex((codeunit >> 12) & 0xF);
|
||||
buffer_[length_++] = Hex((codeunit >> 8) & 0xF);
|
||||
buffer_[length_++] = Hex((codeunit >> 4) & 0xF);
|
||||
buffer_[length_++] = Hex((codeunit >> 0) & 0xF);
|
||||
} else if (codeunit <= Utf8::kMaxOneByteChar) {
|
||||
ASSERT(remaining > 1);
|
||||
buffer_[length_++] = codeunit;
|
||||
} else if (codeunit <= Utf8::kMaxTwoByteChar) {
|
||||
ASSERT(remaining > 2);
|
||||
buffer_[length_++] = 0xC0 | (codeunit >> 6);
|
||||
buffer_[length_++] = 0x80 | (codeunit & kMask);
|
||||
} else if (codeunit <= Utf8::kMaxThreeByteChar) {
|
||||
ASSERT(remaining > 3);
|
||||
buffer_[length_++] = 0xE0 | (codeunit >> 12);
|
||||
buffer_[length_++] = 0x80 | ((codeunit >> 6) & kMask);
|
||||
buffer_[length_++] = 0x80 | (codeunit & kMask);
|
||||
} else {
|
||||
ASSERT(codeunit <= Utf8::kMaxFourByteChar);
|
||||
ASSERT(remaining > 4);
|
||||
buffer_[length_++] = 0xF0 | (codeunit >> 18);
|
||||
buffer_[length_++] = 0x80 | ((codeunit >> 12) & kMask);
|
||||
buffer_[length_++] = 0x80 | ((codeunit >> 6) & kMask);
|
||||
buffer_[length_++] = 0x80 | (codeunit & kMask);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
@ -105,18 +249,22 @@ void BaseTextBuffer::EscapeAndAddCodeUnit(uint32_t codeunit) {
|
|||
// Write an incomplete UTF-16 code unit so it can be read by a JSON parser in a
|
||||
// string literal.
|
||||
void BaseTextBuffer::EscapeAndAddUTF16CodeUnit(uint16_t codeunit) {
|
||||
Printf("\\u%04X", codeunit);
|
||||
intptr_t remaining = capacity_ - length_;
|
||||
ASSERT(remaining > 6);
|
||||
buffer_[length_++] = '\\';
|
||||
buffer_[length_++] = 'u';
|
||||
buffer_[length_++] = Hex((codeunit >> 12) & 0xF);
|
||||
buffer_[length_++] = Hex((codeunit >> 8) & 0xF);
|
||||
buffer_[length_++] = Hex((codeunit >> 4) & 0xF);
|
||||
buffer_[length_++] = Hex((codeunit >> 0) & 0xF);
|
||||
}
|
||||
|
||||
void BaseTextBuffer::AddString(const char* s) {
|
||||
Printf("%s", s);
|
||||
AddRaw(reinterpret_cast<const uint8_t*>(s), strlen(s));
|
||||
}
|
||||
|
||||
void BaseTextBuffer::AddEscapedString(const char* s) {
|
||||
intptr_t len = strlen(s);
|
||||
for (int i = 0; i < len; i++) {
|
||||
EscapeAndAddCodeUnit(s[i]);
|
||||
}
|
||||
AddEscapedUTF8(s, strlen(s));
|
||||
}
|
||||
|
||||
TextBuffer::TextBuffer(intptr_t buf_size) {
|
||||
|
@ -143,6 +291,7 @@ bool TextBuffer::EnsureCapacity(intptr_t len) {
|
|||
intptr_t remaining = capacity_ - length_;
|
||||
if (remaining <= len) {
|
||||
intptr_t new_size = capacity_ + Utils::Maximum(capacity_, len + 1);
|
||||
new_size = Utils::Maximum(new_size, static_cast<intptr_t>(256));
|
||||
char* new_buf = reinterpret_cast<char*>(realloc(buffer_, new_size));
|
||||
buffer_ = new_buf;
|
||||
capacity_ = new_size;
|
||||
|
|
|
@ -22,12 +22,14 @@ class BaseTextBuffer : public ValueObject {
|
|||
intptr_t Printf(const char* format, ...) PRINTF_ATTRIBUTE(2, 3);
|
||||
intptr_t VPrintf(const char* format, va_list args);
|
||||
void AddChar(char ch);
|
||||
void EscapeAndAddUTF16CodeUnit(uint16_t cu);
|
||||
void EscapeAndAddCodeUnit(uint32_t cu);
|
||||
void AddString(const char* s);
|
||||
void AddEscapedString(const char* s);
|
||||
void AddRaw(const uint8_t* buffer, intptr_t buffer_length);
|
||||
|
||||
void AddEscapedString(const char* s);
|
||||
void AddEscapedUTF8(const char* s, intptr_t len);
|
||||
void AddEscapedLatin1(const uint8_t* code_units, intptr_t len);
|
||||
void AddEscapedUTF16(const uint16_t* code_units, intptr_t len);
|
||||
|
||||
// Returns a pointer to the current internal buffer. Whether the pointer is
|
||||
// still valid after the BaseTextBuffer dies depends on the subclass.
|
||||
char* buffer() const { return buffer_; }
|
||||
|
@ -37,6 +39,11 @@ class BaseTextBuffer : public ValueObject {
|
|||
// should be assumed to invalidate the contents of previous calls to buffer().
|
||||
virtual void Clear() = 0;
|
||||
|
||||
private:
|
||||
intptr_t EscapedCodeUnitLength(uint32_t cu);
|
||||
void EscapeAndAddCodeUnit(uint32_t cu);
|
||||
void EscapeAndAddUTF16CodeUnit(uint16_t cu);
|
||||
|
||||
protected:
|
||||
virtual bool EnsureCapacity(intptr_t len) = 0;
|
||||
|
||||
|
|
|
@ -348,18 +348,7 @@ void JSONWriter::AddEscapedUTF8String(const char* s, intptr_t len) {
|
|||
if (s == NULL) {
|
||||
return;
|
||||
}
|
||||
const uint8_t* s8 = reinterpret_cast<const uint8_t*>(s);
|
||||
intptr_t i = 0;
|
||||
for (; i < len;) {
|
||||
// Extract next UTF8 character.
|
||||
int32_t ch = 0;
|
||||
int32_t ch_len = Utf8::Decode(&s8[i], len - i, &ch);
|
||||
ASSERT(ch_len != 0);
|
||||
buffer_.EscapeAndAddCodeUnit(ch);
|
||||
// Move i forward.
|
||||
i += ch_len;
|
||||
}
|
||||
ASSERT(i == len);
|
||||
buffer_.AddEscapedUTF8(s, len);
|
||||
}
|
||||
|
||||
bool JSONWriter::AddDartString(const String& s,
|
||||
|
@ -373,29 +362,26 @@ bool JSONWriter::AddDartString(const String& s,
|
|||
if (!Utils::RangeCheck(offset, count, length)) {
|
||||
count = length - offset;
|
||||
}
|
||||
intptr_t limit = offset + count;
|
||||
for (intptr_t i = offset; i < limit; i++) {
|
||||
uint16_t code_unit = s.CharAt(i);
|
||||
if (Utf16::IsTrailSurrogate(code_unit)) {
|
||||
buffer_.EscapeAndAddUTF16CodeUnit(code_unit);
|
||||
} else if (Utf16::IsLeadSurrogate(code_unit)) {
|
||||
if (i + 1 == limit) {
|
||||
buffer_.EscapeAndAddUTF16CodeUnit(code_unit);
|
||||
} else {
|
||||
uint16_t next_code_unit = s.CharAt(i + 1);
|
||||
if (Utf16::IsTrailSurrogate(next_code_unit)) {
|
||||
uint32_t decoded = Utf16::Decode(code_unit, next_code_unit);
|
||||
buffer_.EscapeAndAddCodeUnit(decoded);
|
||||
i++;
|
||||
} else {
|
||||
buffer_.EscapeAndAddUTF16CodeUnit(code_unit);
|
||||
}
|
||||
}
|
||||
|
||||
if (count > 0) { // Avoid asserts about harmless out-of-bounds index.
|
||||
NoSafepointScope no_safepoint;
|
||||
if (s.IsOneByteString()) {
|
||||
buffer_.AddEscapedLatin1(OneByteString::CharAddr(s, offset), count);
|
||||
} else if (s.IsExternalOneByteString()) {
|
||||
buffer_.AddEscapedLatin1(ExternalOneByteString::CharAddr(s, offset),
|
||||
count);
|
||||
} else if (s.IsTwoByteString()) {
|
||||
buffer_.AddEscapedUTF16(TwoByteString::CharAddr(s, offset), count);
|
||||
} else if (s.IsExternalTwoByteString()) {
|
||||
buffer_.AddEscapedUTF16(ExternalTwoByteString::CharAddr(s, offset),
|
||||
count);
|
||||
} else {
|
||||
buffer_.EscapeAndAddCodeUnit(code_unit);
|
||||
UNREACHABLE();
|
||||
}
|
||||
}
|
||||
|
||||
// Return value indicates whether the string is truncated.
|
||||
intptr_t limit = offset + count;
|
||||
return (offset > 0) || (limit < length);
|
||||
}
|
||||
|
||||
|
|
|
@ -10235,6 +10235,7 @@ class OneByteString : public AllStatic {
|
|||
friend class Utf8;
|
||||
friend class OneByteStringMessageSerializationCluster;
|
||||
friend class Deserializer;
|
||||
friend class JSONWriter;
|
||||
};
|
||||
|
||||
class TwoByteString : public AllStatic {
|
||||
|
@ -10353,6 +10354,7 @@ class TwoByteString : public AllStatic {
|
|||
friend class StringHasher;
|
||||
friend class Symbols;
|
||||
friend class TwoByteStringMessageSerializationCluster;
|
||||
friend class JSONWriter;
|
||||
};
|
||||
|
||||
class ExternalOneByteString : public AllStatic {
|
||||
|
@ -10445,6 +10447,7 @@ class ExternalOneByteString : public AllStatic {
|
|||
friend class StringHasher;
|
||||
friend class Symbols;
|
||||
friend class Utf8;
|
||||
friend class JSONWriter;
|
||||
};
|
||||
|
||||
class ExternalTwoByteString : public AllStatic {
|
||||
|
@ -10532,6 +10535,7 @@ class ExternalTwoByteString : public AllStatic {
|
|||
friend class String;
|
||||
friend class StringHasher;
|
||||
friend class Symbols;
|
||||
friend class JSONWriter;
|
||||
};
|
||||
|
||||
// Matches null_patch.dart / bool_patch.dart.
|
||||
|
|
Loading…
Reference in a new issue