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Overview
| Comment: | Performance optimizations on the JSON parser. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
7dd4b07a42eb84589d34430b9d7bfa88 |
| User & Date: | drh 2015-09-24 01:06:37 |
Context
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2015-09-24
| ||
| 01:40 | Another (smaller) performance optimization for the JSON parser. check-in: c43daa8c user: drh tags: trunk | |
| 01:06 | Performance optimizations on the JSON parser. check-in: 7dd4b07a user: drh tags: trunk | |
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2015-09-23
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| 19:17 | Take care that the number of reserved bits per page is consistent between the source and destination databases when doing the back-copy on a VACUUM. check-in: 5b61b72f user: drh tags: trunk | |
Changes
Changes to ext/misc/json1.c.
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#define UNUSED_PARAM(X) (void)(X) /* ** Versions of isspace(), isalnum() and isdigit() to which it is safe ** to pass signed char values. */ #define safe_isspace(x) isspace((unsigned char)(x)) #define safe_isdigit(x) isdigit((unsigned char)(x)) #define safe_isalnum(x) isalnum((unsigned char)(x)) /* Unsigned integer types */ typedef sqlite3_uint64 u64; typedef unsigned int u32; typedef unsigned char u8; /* Objects */ typedef struct JsonString JsonString; ................................................................................ case JSON_ARRAY: case JSON_OBJECT: { jsonReturnJson(pNode, pCtx, aReplace); break; } } } /* ** Create a new JsonNode instance based on the arguments and append that ** instance to the JsonParse. Return the index in pParse->aNode[] of the ** new node, or -1 if a memory allocation fails. */ static int jsonParseAddNode( ................................................................................ JsonParse *pParse, /* Append the node to this object */ u32 eType, /* Node type */ u32 n, /* Content size or sub-node count */ const char *zContent /* Content */ ){ JsonNode *p; if( pParse->nNode>=pParse->nAlloc ){ u32 nNew; JsonNode *pNew; if( pParse->oom ) return -1; nNew = pParse->nAlloc*2 + 10; pNew = sqlite3_realloc(pParse->aNode, sizeof(JsonNode)*nNew); if( pNew==0 ){ pParse->oom = 1; return -1; } pParse->nAlloc = nNew; pParse->aNode = pNew; } p = &pParse->aNode[pParse->nNode]; p->eType = (u8)eType; p->jnFlags = 0; p->iVal = 0; p->n = n; p->u.zJContent = zContent; ................................................................................ } jsonEachCursorReset(p); return rc; }else if( p->bRecursive && jsonParseFindParents(&p->sParse) ){ jsonEachCursorReset(p); return SQLITE_NOMEM; }else{ JsonNode *pNode; if( idxNum==3 ){ const char *zErr = 0; zRoot = (const char*)sqlite3_value_text(argv[1]); if( zRoot==0 ) return SQLITE_OK; n = sqlite3_value_bytes(argv[1]); p->zRoot = sqlite3_malloc64( n+1 ); if( p->zRoot==0 ) return SQLITE_NOMEM; |
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#define UNUSED_PARAM(X) (void)(X) /* ** Versions of isspace(), isalnum() and isdigit() to which it is safe ** to pass signed char values. */ #define safe_isdigit(x) isdigit((unsigned char)(x)) #define safe_isalnum(x) isalnum((unsigned char)(x)) /* ** Growing our own isspace() routine this way is twice as fast as ** the library isspace() function, resulting in a 7% overall performance ** increase for the parser. (Ubuntu14.10 gcc 4.8.4 x64 with -Os). */ static const char jsonIsSpace[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }; #define safe_isspace(x) (jsonIsSpace[(unsigned char)x]) /* Unsigned integer types */ typedef sqlite3_uint64 u64; typedef unsigned int u32; typedef unsigned char u8; /* Objects */ typedef struct JsonString JsonString; ................................................................................ case JSON_ARRAY: case JSON_OBJECT: { jsonReturnJson(pNode, pCtx, aReplace); break; } } } /* Forward reference */ static int jsonParseAddNode(JsonParse*,u32,u32,const char*); /* ** A macro to hint to the compiler that a function should not be ** inlined. */ #if defined(__GNUC__) # define JSON_NOINLINE __attribute__((noinline)) #elif defined(_MSC_VER) && _MSC_VER>=1310 # define JSON_NOINLINE __declspec(noinline) #else # define JSON_NOINLINE #endif static JSON_NOINLINE int jsonParseAddNodeExpand( JsonParse *pParse, /* Append the node to this object */ u32 eType, /* Node type */ u32 n, /* Content size or sub-node count */ const char *zContent /* Content */ ){ u32 nNew; JsonNode *pNew; assert( pParse->nNode>=pParse->nAlloc ); if( pParse->oom ) return -1; nNew = pParse->nAlloc*2 + 10; pNew = sqlite3_realloc(pParse->aNode, sizeof(JsonNode)*nNew); if( pNew==0 ){ pParse->oom = 1; return -1; } pParse->nAlloc = nNew; pParse->aNode = pNew; assert( pParse->nNode<pParse->nAlloc ); return jsonParseAddNode(pParse, eType, n, zContent); } /* ** Create a new JsonNode instance based on the arguments and append that ** instance to the JsonParse. Return the index in pParse->aNode[] of the ** new node, or -1 if a memory allocation fails. */ static int jsonParseAddNode( ................................................................................ JsonParse *pParse, /* Append the node to this object */ u32 eType, /* Node type */ u32 n, /* Content size or sub-node count */ const char *zContent /* Content */ ){ JsonNode *p; if( pParse->nNode>=pParse->nAlloc ){ return jsonParseAddNodeExpand(pParse, eType, n, zContent); } p = &pParse->aNode[pParse->nNode]; p->eType = (u8)eType; p->jnFlags = 0; p->iVal = 0; p->n = n; p->u.zJContent = zContent; ................................................................................ } jsonEachCursorReset(p); return rc; }else if( p->bRecursive && jsonParseFindParents(&p->sParse) ){ jsonEachCursorReset(p); return SQLITE_NOMEM; }else{ JsonNode *pNode = 0; if( idxNum==3 ){ const char *zErr = 0; zRoot = (const char*)sqlite3_value_text(argv[1]); if( zRoot==0 ) return SQLITE_OK; n = sqlite3_value_bytes(argv[1]); p->zRoot = sqlite3_malloc64( n+1 ); if( p->zRoot==0 ) return SQLITE_NOMEM; |