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Further improvement to JSON parser performance.

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FossilOrigin-Name: 144c8ccf6e5bb2527dd98742f0d67e0a16c627e7c67f754ce8ed4c4fb5b8d8b6
This commit is contained in:
drh 2023-07-19 17:24:36 +00:00
parent 8376ae7295
commit 50834d8b74
3 changed files with 32 additions and 14 deletions
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12
manifest
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@ -1,5 +1,5 @@
C Further\sperformance\senhancements\sto\sJSON\sparsing\sand\srendering.\s\sTotal\nperformance\sgain\sfor\slarge\sJSONs\sso\sfar\son\sthis\sbranch\sis\sabout\s11%.
D 2023-07-19T15:06:29.535
C Further\simprovement\sto\sJSON\sparser\sperformance.
D 2023-07-19T17:24:36.452
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -597,7 +597,7 @@ F src/hash.h 3340ab6e1d13e725571d7cee6d3e3135f0779a7d8e76a9ce0a85971fa3953c51
F src/hwtime.h f9c2dfb84dce7acf95ce6d289e46f5f9d3d1afd328e53da8f8e9008e3b3caae6
F src/in-operator.md 10cd8f4bcd225a32518407c2fb2484089112fd71
F src/insert.c 3f0a94082d978bbdd33c38fefea15346c6c6bffb70bc645a71dc0f1f87dd3276
F src/json.c 4a875e61ce6aa869bd6028836f198e7ab08d3efceb8ab8d0529bec8061b67e94
F src/json.c e48136fce64e5004b1b8be76624cc9a4ac9ff6ae630a97df187c0ea4b9692d1b
F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
F src/loadext.c 176d6b2cb18a6ad73b133db17f6fc351c4d9a2d510deebdb76c22bde9cfd1465
F src/main.c 512b1d45bc556edf4471a845afb7ba79e64bd5b832ab222dc195c469534cd002
@ -2043,8 +2043,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
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R ab82eb710f468841d4023aaae186be2d
U drh
Z 04400ecbf8a4a25997341f5b2d7f0282
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# Remove this line to create a well-formed Fossil manifest.

2
manifest.uuid
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@ -1 +1 @@
adb4d6b007cbe9d7c9670f5fc196443ebe0f3a89df1f3290ba6247fcf83fe5bd
144c8ccf6e5bb2527dd98742f0d67e0a16c627e7c67f754ce8ed4c4fb5b8d8b6

32
src/json.c
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@ -1272,8 +1272,30 @@ json_parse_restart:
parse_string:
cDelim = z[i];
for(j=i+1; 1; j++){
unsigned char uc = (unsigned char)z[j];
if( uc=='\\' ){
static const char aOk[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 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, 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, 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, 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, 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, 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, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
};
if( aOk[(unsigned char)z[j]] ) continue;
c = z[j];
if( c==cDelim ){
break;
}else if( c=='\\' ){
c = z[++j];
if( c=='"' || c=='\\' || c=='/' || c=='b' || c=='f'
|| c=='n' || c=='r' || c=='t'
@ -1293,11 +1315,7 @@ json_parse_restart:
pParse->iErr = j;
return -1;
}
}else if( uc>'\'' ){
continue;
}else if( uc==cDelim ){
break;
}else if( uc<=0x1f ){
}else if( c<=0x1f ){
/* Control characters are not allowed in strings */
pParse->iErr = j;
return -1;