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Apply LIKELY/UNLIKELY in Reader

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This commit is contained in:
Milo Yip 2015-12-31 18:10:17 +08:00
parent 122c722993
commit df76c0d6d7
1 changed files with 62 additions and 61 deletions
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123
include/rapidjson/reader.h
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@ -55,7 +55,7 @@ RAPIDJSON_DIAG_OFF(effc++)
#ifndef RAPIDJSON_PARSE_ERROR_EARLY_RETURN
#define RAPIDJSON_PARSE_ERROR_EARLY_RETURN(value) \
RAPIDJSON_MULTILINEMACRO_BEGIN \
if (HasParseError()) { return value; } \
if (RAPIDJSON_UNLIKELY(HasParseError())) { return value; } \
RAPIDJSON_MULTILINEMACRO_END
#endif
#define RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID \
@ -408,7 +408,7 @@ public:
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN(parseResult_);
if (is.Peek() == '\0') {
if (RAPIDJSON_UNLIKELY(is.Peek() == '\0')) {
RAPIDJSON_PARSE_ERROR_NORETURN(kParseErrorDocumentEmpty, is.Tell());
RAPIDJSON_PARSE_ERROR_EARLY_RETURN(parseResult_);
}
@ -420,7 +420,7 @@ public:
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN(parseResult_);
if (is.Peek() != '\0') {
if (RAPIDJSON_UNLIKELY(is.Peek() != '\0')) {
RAPIDJSON_PARSE_ERROR_NORETURN(kParseErrorDocumentRootNotSingular, is.Tell());
RAPIDJSON_PARSE_ERROR_EARLY_RETURN(parseResult_);
}
@ -476,29 +476,30 @@ private:
SkipWhitespace(is);
if (parseFlags & kParseCommentsFlag) {
while (is.Peek() == '/') {
while (RAPIDJSON_UNLIKELY(is.Peek() == '/')) {
is.Take();
if (is.Peek() == '*') {
is.Take();
while (true) {
if (is.Peek() == '\0')
if (RAPIDJSON_UNLIKELY(is.Peek() == '\0'))
RAPIDJSON_PARSE_ERROR(kParseErrorUnspecificSyntaxError, is.Tell());
if (is.Take() == '*') {
if (is.Peek() == '\0')
if (RAPIDJSON_UNLIKELY(is.Peek() == '\0'))
RAPIDJSON_PARSE_ERROR(kParseErrorUnspecificSyntaxError, is.Tell());
if (is.Take() == '/')
break;
}
}
} else if (is.Peek() == '/') {
}
else if (RAPIDJSON_LIKELY(is.Peek() == '/')) {
is.Take();
while (is.Peek() != '\0' && is.Take() != '\n') { }
} else {
RAPIDJSON_PARSE_ERROR(kParseErrorUnspecificSyntaxError, is.Tell());
}
else
RAPIDJSON_PARSE_ERROR(kParseErrorUnspecificSyntaxError, is.Tell());
SkipWhitespace(is);
}
@ -511,7 +512,7 @@ private:
RAPIDJSON_ASSERT(is.Peek() == '{');
is.Take(); // Skip '{'
if (!handler.StartObject())
if (RAPIDJSON_UNLIKELY(!handler.StartObject()))
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
SkipWhitespaceAndComments<parseFlags>(is);
@ -519,13 +520,13 @@ private:
if (is.Peek() == '}') {
is.Take();
if (!handler.EndObject(0)) // empty object
if (RAPIDJSON_UNLIKELY(!handler.EndObject(0))) // empty object
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
return;
}
for (SizeType memberCount = 0;;) {
if (is.Peek() != '"')
if (RAPIDJSON_UNLIKELY(is.Peek() != '"'))
RAPIDJSON_PARSE_ERROR(kParseErrorObjectMissName, is.Tell());
ParseString<parseFlags>(is, handler, true);
@ -534,7 +535,7 @@ private:
SkipWhitespaceAndComments<parseFlags>(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
if (is.Take() != ':')
if (RAPIDJSON_UNLIKELY(is.Take() != ':'))
RAPIDJSON_PARSE_ERROR(kParseErrorObjectMissColon, is.Tell());
SkipWhitespaceAndComments<parseFlags>(is);
@ -554,7 +555,7 @@ private:
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
break;
case '}':
if (!handler.EndObject(memberCount))
if (RAPIDJSON_UNLIKELY(!handler.EndObject(memberCount)))
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
return;
default:
@ -570,7 +571,7 @@ private:
RAPIDJSON_ASSERT(is.Peek() == '[');
is.Take(); // Skip '['
if (!handler.StartArray())
if (RAPIDJSON_UNLIKELY(!handler.StartArray()))
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
SkipWhitespaceAndComments<parseFlags>(is);
@ -578,7 +579,7 @@ private:
if (is.Peek() == ']') {
is.Take();
if (!handler.EndArray(0)) // empty array
if (RAPIDJSON_UNLIKELY(!handler.EndArray(0))) // empty array
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
return;
}
@ -597,7 +598,7 @@ private:
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
break;
case ']':
if (!handler.EndArray(elementCount))
if (RAPIDJSON_UNLIKELY(!handler.EndArray(elementCount)))
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
return;
default:
@ -612,8 +613,8 @@ private:
RAPIDJSON_ASSERT(is.Peek() == 'n');
is.Take();
if (is.Take() == 'u' && is.Take() == 'l' && is.Take() == 'l') {
if (!handler.Null())
if (RAPIDJSON_LIKELY(is.Take() == 'u' && is.Take() == 'l' && is.Take() == 'l')) {
if (RAPIDJSON_UNLIKELY(!handler.Null()))
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
}
else
@ -625,8 +626,8 @@ private:
RAPIDJSON_ASSERT(is.Peek() == 't');
is.Take();
if (is.Take() == 'r' && is.Take() == 'u' && is.Take() == 'e') {
if (!handler.Bool(true))
if (RAPIDJSON_LIKELY(is.Take() == 'r' && is.Take() == 'u' && is.Take() == 'e')) {
if (RAPIDJSON_UNLIKELY(!handler.Bool(true)))
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
}
else
@ -638,8 +639,8 @@ private:
RAPIDJSON_ASSERT(is.Peek() == 'f');
is.Take();
if (is.Take() == 'a' && is.Take() == 'l' && is.Take() == 's' && is.Take() == 'e') {
if (!handler.Bool(false))
if (RAPIDJSON_LIKELY(is.Take() == 'a' && is.Take() == 'l' && is.Take() == 's' && is.Take() == 'e')) {
if (RAPIDJSON_UNLIKELY(!handler.Bool(false)))
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, is.Tell());
}
else
@ -715,7 +716,7 @@ private:
const typename TargetEncoding::Ch* const str = stackStream.Pop();
success = (isKey ? handler.Key(str, length, true) : handler.String(str, length, true));
}
if (!success)
if (RAPIDJSON_UNLIKELY(!success))
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, s.Tell());
}
@ -740,21 +741,21 @@ private:
for (;;) {
Ch c = is.Peek();
if (c == '\\') { // Escape
if (RAPIDJSON_UNLIKELY(c == '\\')) { // Escape
is.Take();
Ch e = is.Take();
if ((sizeof(Ch) == 1 || unsigned(e) < 256) && escape[static_cast<unsigned char>(e)])
if ((sizeof(Ch) == 1 || unsigned(e) < 256) && RAPIDJSON_LIKELY(escape[static_cast<unsigned char>(e)]))
os.Put(static_cast<typename TEncoding::Ch>(escape[static_cast<unsigned char>(e)]));
else if (e == 'u') { // Unicode
else if (RAPIDJSON_LIKELY(e == 'u')) { // Unicode
unsigned codepoint = ParseHex4(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
if (codepoint >= 0xD800 && codepoint <= 0xDBFF) {
if (RAPIDJSON_UNLIKELY(codepoint >= 0xD800 && codepoint <= 0xDBFF)) {
// Handle UTF-16 surrogate pair
if (is.Take() != '\\' || is.Take() != 'u')
if (RAPIDJSON_UNLIKELY(is.Take() != '\\' || is.Take() != 'u'))
RAPIDJSON_PARSE_ERROR(kParseErrorStringUnicodeSurrogateInvalid, is.Tell() - 2);
unsigned codepoint2 = ParseHex4(is);
RAPIDJSON_PARSE_ERROR_EARLY_RETURN_VOID;
if (codepoint2 < 0xDC00 || codepoint2 > 0xDFFF)
if (RAPIDJSON_UNLIKELY(codepoint2 < 0xDC00 || codepoint2 > 0xDFFF))
RAPIDJSON_PARSE_ERROR(kParseErrorStringUnicodeSurrogateInvalid, is.Tell() - 2);
codepoint = (((codepoint - 0xD800) << 10) | (codepoint2 - 0xDC00)) + 0x10000;
}
@ -763,19 +764,19 @@ private:
else
RAPIDJSON_PARSE_ERROR(kParseErrorStringEscapeInvalid, is.Tell() - 1);
}
else if (c == '"') { // Closing double quote
else if (RAPIDJSON_UNLIKELY(c == '"')) { // Closing double quote
is.Take();
os.Put('\0'); // null-terminate the string
return;
}
else if (c == '\0')
else if (RAPIDJSON_UNLIKELY(c == '\0'))
RAPIDJSON_PARSE_ERROR(kParseErrorStringMissQuotationMark, is.Tell() - 1);
else if (static_cast<unsigned>(c) < 0x20) // RFC 4627: unescaped = %x20-21 / %x23-5B / %x5D-10FFFF
else if (RAPIDJSON_UNLIKELY(static_cast<unsigned>(c) < 0x20)) // RFC 4627: unescaped = %x20-21 / %x23-5B / %x5D-10FFFF
RAPIDJSON_PARSE_ERROR(kParseErrorStringEscapeInvalid, is.Tell() - 1);
else {
if (parseFlags & kParseValidateEncodingFlag ?
if (RAPIDJSON_UNLIKELY((parseFlags & kParseValidateEncodingFlag ?
!Transcoder<SEncoding, TEncoding>::Validate(is, os) :
!Transcoder<SEncoding, TEncoding>::Transcode(is, os))
!Transcoder<SEncoding, TEncoding>::Transcode(is, os))))
RAPIDJSON_PARSE_ERROR(kParseErrorStringInvalidEncoding, is.Tell());
}
}
@ -843,17 +844,17 @@ private:
uint64_t i64 = 0;
bool use64bit = false;
int significandDigit = 0;
if (s.Peek() == '0') {
if (RAPIDJSON_UNLIKELY(s.Peek() == '0')) {
i = 0;
s.TakePush();
}
else if (s.Peek() >= '1' && s.Peek() <= '9') {
else if (RAPIDJSON_LIKELY(s.Peek() >= '1' && s.Peek() <= '9')) {
i = static_cast<unsigned>(s.TakePush() - '0');
if (minus)
while (s.Peek() >= '0' && s.Peek() <= '9') {
if (i >= 214748364) { // 2^31 = 2147483648
if (i != 214748364 || s.Peek() > '8') {
while (RAPIDJSON_LIKELY(s.Peek() >= '0' && s.Peek() <= '9')) {
if (RAPIDJSON_UNLIKELY(i >= 214748364)) { // 2^31 = 2147483648
if (RAPIDJSON_LIKELY(i != 214748364 || s.Peek() > '8')) {
i64 = i;
use64bit = true;
break;
@ -863,9 +864,9 @@ private:
significandDigit++;
}
else
while (s.Peek() >= '0' && s.Peek() <= '9') {
if (i >= 429496729) { // 2^32 - 1 = 4294967295
if (i != 429496729 || s.Peek() > '5') {
while (RAPIDJSON_LIKELY(s.Peek() >= '0' && s.Peek() <= '9')) {
if (RAPIDJSON_UNLIKELY(i >= 429496729)) { // 2^32 - 1 = 4294967295
if (RAPIDJSON_LIKELY(i != 429496729 || s.Peek() > '5')) {
i64 = i;
use64bit = true;
break;
@ -883,9 +884,9 @@ private:
double d = 0.0;
if (use64bit) {
if (minus)
while (s.Peek() >= '0' && s.Peek() <= '9') {
if (i64 >= RAPIDJSON_UINT64_C2(0x0CCCCCCC, 0xCCCCCCCC)) // 2^63 = 9223372036854775808
if (i64 != RAPIDJSON_UINT64_C2(0x0CCCCCCC, 0xCCCCCCCC) || s.Peek() > '8') {
while (RAPIDJSON_LIKELY(s.Peek() >= '0' && s.Peek() <= '9')) {
if (RAPIDJSON_UNLIKELY(i64 >= RAPIDJSON_UINT64_C2(0x0CCCCCCC, 0xCCCCCCCC))) // 2^63 = 9223372036854775808
if (RAPIDJSON_LIKELY(i64 != RAPIDJSON_UINT64_C2(0x0CCCCCCC, 0xCCCCCCCC) || s.Peek() > '8')) {
d = i64;
useDouble = true;
break;
@ -894,9 +895,9 @@ private:
significandDigit++;
}
else
while (s.Peek() >= '0' && s.Peek() <= '9') {
if (i64 >= RAPIDJSON_UINT64_C2(0x19999999, 0x99999999)) // 2^64 - 1 = 18446744073709551615
if (i64 != RAPIDJSON_UINT64_C2(0x19999999, 0x99999999) || s.Peek() > '5') {
while (RAPIDJSON_LIKELY(s.Peek() >= '0' && s.Peek() <= '9')) {
if (RAPIDJSON_UNLIKELY(i64 >= RAPIDJSON_UINT64_C2(0x19999999, 0x99999999))) // 2^64 - 1 = 18446744073709551615
if (RAPIDJSON_LIKELY(i64 != RAPIDJSON_UINT64_C2(0x19999999, 0x99999999) || s.Peek() > '5')) {
d = i64;
useDouble = true;
break;
@ -908,8 +909,8 @@ private:
// Force double for big integer
if (useDouble) {
while (s.Peek() >= '0' && s.Peek() <= '9') {
if (d >= 1.7976931348623157e307) // DBL_MAX / 10.0
while (RAPIDJSON_LIKELY(s.Peek() >= '0' && s.Peek() <= '9')) {
if (RAPIDJSON_UNLIKELY(d >= 1.7976931348623157e307)) // DBL_MAX / 10.0
RAPIDJSON_PARSE_ERROR(kParseErrorNumberTooBig, s.Tell());
d = d * 10 + (s.TakePush() - '0');
}
@ -922,7 +923,7 @@ private:
s.Take();
decimalPosition = s.Length();
if (!(s.Peek() >= '0' && s.Peek() <= '9'))
if (RAPIDJSON_UNLIKELY(!(s.Peek() >= '0' && s.Peek() <= '9')))
RAPIDJSON_PARSE_ERROR(kParseErrorNumberMissFraction, s.Tell());
if (!useDouble) {
@ -931,7 +932,7 @@ private:
if (!use64bit)
i64 = i;
while (s.Peek() >= '0' && s.Peek() <= '9') {
while (RAPIDJSON_LIKELY(s.Peek() >= '0' && s.Peek() <= '9')) {
if (i64 > RAPIDJSON_UINT64_C2(0x1FFFFF, 0xFFFFFFFF)) // 2^53 - 1 for fast path
break;
else {
@ -950,11 +951,11 @@ private:
useDouble = true;
}
while (s.Peek() >= '0' && s.Peek() <= '9') {
while (RAPIDJSON_LIKELY(s.Peek() >= '0' && s.Peek() <= '9')) {
if (significandDigit < 17) {
d = d * 10.0 + (s.TakePush() - '0');
--expFrac;
if (d > 0.0)
if (RAPIDJSON_LIKELY(d > 0.0))
significandDigit++;
}
else
@ -981,22 +982,22 @@ private:
expMinus = true;
}
if (s.Peek() >= '0' && s.Peek() <= '9') {
if (RAPIDJSON_LIKELY(s.Peek() >= '0' && s.Peek() <= '9')) {
exp = static_cast<int>(s.Take() - '0');
if (expMinus) {
while (s.Peek() >= '0' && s.Peek() <= '9') {
while (RAPIDJSON_LIKELY(s.Peek() >= '0' && s.Peek() <= '9')) {
exp = exp * 10 + static_cast<int>(s.Take() - '0');
if (exp >= 214748364) { // Issue #313: prevent overflow exponent
while (s.Peek() >= '0' && s.Peek() <= '9') // Consume the rest of exponent
while (RAPIDJSON_UNLIKELY(s.Peek() >= '0' && s.Peek() <= '9')) // Consume the rest of exponent
s.Take();
}
}
}
else { // positive exp
int maxExp = 308 - expFrac;
while (s.Peek() >= '0' && s.Peek() <= '9') {
while (RAPIDJSON_LIKELY(s.Peek() >= '0' && s.Peek() <= '9')) {
exp = exp * 10 + static_cast<int>(s.Take() - '0');
if (exp > maxExp)
if (RAPIDJSON_UNLIKELY(exp > maxExp))
RAPIDJSON_PARSE_ERROR(kParseErrorNumberTooBig, s.Tell());
}
}
@ -1036,7 +1037,7 @@ private:
cont = handler.Uint(i);
}
}
if (!cont)
if (RAPIDJSON_UNLIKELY(!cont))
RAPIDJSON_PARSE_ERROR(kParseErrorTermination, s.Tell());
}