Switch to using jsonParseCached() for json_patch().

FossilOrigin-Name: 2ed9c59e6a51037e63485d0a92dae25443116beddfca1ac73d2f5d5be38d4ad3

manifest

@@ -1,5 +1,5 @@
-C If\sthe\sinput\sJSON\sto\sa\sjson\sfunction\sthat\suses\scache\scomes\sfrom\san\sRCStr\nvalue,\sthen\suse\sthat\sRCStr\svalue\sin\sthe\sparse\srather\sthan\smaking\sa\scopy.
+C Switch\sto\susing\sjsonParseCached()\sfor\sjson_patch().
-D 2023-07-27T20:28:29.957
+D 2023-07-27T23:51:36.392
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -598,7 +598,7 @@ 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 481dffa457276d850836953bbd2a61a00a98f8cf09c64c29c6f05ac02a84affd
+F src/json.c 60b6b0815ddaf546396e3c7328065a114b581721dc1fa20697a52610fb2259aa
 F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
 F src/loadext.c 176d6b2cb18a6ad73b133db17f6fc351c4d9a2d510deebdb76c22bde9cfd1465
 F src/main.c 512b1d45bc556edf4471a845afb7ba79e64bd5b832ab222dc195c469534cd002
@@ -2044,8 +2044,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P ab1edcc7fedcf27922d5db4bc1bc673b1495ca9c66eb6debdda7b7776c068888
+P 509ae9c1470dd79d320e84371e1e6662fb85fa0571df5ed8c4d946d10cdfe821
-R bc4f27407c20176b7c3faf6538598e39
+R a667d9301618252314cdf4d506cbebf3
 U drh
-Z 559a7376c279a69632a349e06eee6ec2
+Z 152f86b69395ef2af8d236118a3bf25d
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-509ae9c1470dd79d320e84371e1e6662fb85fa0571df5ed8c4d946d10cdfe821
+2ed9c59e6a51037e63485d0a92dae25443116beddfca1ac73d2f5d5be38d4ad3

src/json.c

@@ -1751,26 +1751,15 @@ json_parse_restart:
 ** are any errors.  If an error occurs, free all memory held by pParse,
 ** but not pParse itself.
 **
-** pParse is uninitialized when this routine is called.
+** pParse must be initialized to an empty parse object prior to calling
-**
+** this routine.
-** pParse->nJPRef set to 1.  The caller becomes the owner of the
-** the JsonParse object.
-**
-** pParse->bOwnsJson is set to bTakeJson.  If bTakeJson is 1, the newly
-** initialized JsonParse object will become the owner of the zJson input
-** string.  If bTakeJson is 0, then the caller is responsible for
-** preserving zJson for the lifetime of the JsonParse object.
 */
 static int jsonParse(
   JsonParse *pParse,           /* Initialize and fill this JsonParse object */
-  sqlite3_context *pCtx,       /* Report errors here */
+  sqlite3_context *pCtx        /* Report errors here */
-  char *zJson                  /* Input JSON text to be parsed */
 ){
   int i;
-  memset(pParse, 0, sizeof(*pParse));
+  const char *zJson = pParse->zJson;
-  if( zJson==0 ) return 1;
-  pParse->zJson = zJson;
-  pParse->nJPRef = 1;
   i = jsonParseValue(pParse, 0);
   if( pParse->oom ) i = -1;
   if( i>0 ){
@@ -1891,7 +1880,6 @@ static JsonParse *jsonParseCached(
   u32 iMinHold = 0xffffffff;
   u32 iMaxHold = 0;
   int bJsonRCStr;
-  int rc;
 
   if( zJson==0 ) return 0;
   for(iKey=0; iKey<JSON_CACHE_SZ; iKey++){
@@ -1947,13 +1935,13 @@ static JsonParse *jsonParseCached(
   memset(p, 0, sizeof(*p));
   if( bJsonRCStr ){
     p->zJson = sqlite3RCStrRef(zJson);
+    p->bJsonIsRCStr = 1;
   }else{
     p->zJson = (char*)&p[1];
     memcpy(p->zJson, zJson, nJson+1);
   }
-  rc = jsonParse(p, pErrCtx, p->zJson);
+  p->nJPRef = 1;
-  p->bJsonIsRCStr = bJsonRCStr;
+  if( jsonParse(p, pErrCtx) ){
-  if( rc ){
     if( pErrCtx==0 ){
       p->nErr = 1;
       assert( p->nJPRef==1 ); /* Caller will own the new JsonParse object p */
@@ -2677,29 +2665,27 @@ static void jsonPatchFunc(
   int argc,
   sqlite3_value **argv
 ){
-  JsonParse x;     /* The JSON that is being patched */
+  JsonParse *pX;     /* The JSON that is being patched */
-  JsonParse y;     /* The patch */
+  JsonParse *pY;     /* The patch */
   JsonNode *pResult;   /* The result of the merge */
 
   UNUSED_PARAMETER(argc);
-  if( jsonParse(&x, ctx, (char*)sqlite3_value_text(argv[0])) ) return;
+  pX = jsonParseCached(ctx, argv[0], ctx, 1);
-  if( jsonParse(&y, ctx, (char*)sqlite3_value_text(argv[1])) ){
+  if( pX==0 ) return;
-    jsonParseReset(&x);
+  pY = jsonParseCached(ctx, argv[1], ctx, 1);
-    return;
+  if( pY==0 ) return;
-  }
+  pX->useMod = 1;
-  x.useMod = 1;
+  pX->hasMod = 1;
-  y.useMod = 1;
+  pY->useMod = 1;
-  pResult = jsonMergePatch(&x, 0, y.aNode);
+  pResult = jsonMergePatch(pX, 0, pY->aNode);
-  assert( pResult!=0 || x.oom );
+  assert( pResult!=0 || pX->oom );
-  if( pResult && x.oom==0 ){
+  if( pResult && pX->oom==0 ){
-    jsonDebugPrintParse(&x);
+    jsonDebugPrintParse(pX);
     jsonDebugPrintNode(pResult);
-    jsonReturnJson(&x, pResult, ctx, 0);
+    jsonReturnJson(pX, pResult, ctx, 0);
   }else{
     sqlite3_result_error_nomem(ctx);
   }
-  jsonParseReset(&x);
-  jsonParseReset(&y);
 }
 
 
@@ -3326,7 +3312,6 @@ static int jsonEachOpenTree(sqlite3_vtab *p, sqlite3_vtab_cursor **ppCursor){
 /* Reset a JsonEachCursor back to its original state.  Free any memory
 ** held. */
 static void jsonEachCursorReset(JsonEachCursor *p){
-  sqlite3_free(p->zJson);
   sqlite3_free(p->zRoot);
   jsonParseReset(&p->sParse);
   p->iRowid = 0;
@@ -3646,11 +3631,19 @@ static int jsonEachFilter(
   if( idxNum==0 ) return SQLITE_OK;
   z = (const char*)sqlite3_value_text(argv[0]);
   if( z==0 ) return SQLITE_OK;
+  memset(&p->sParse, 0, sizeof(p->sParse));
+  p->sParse.nJPRef = 1;
+  if( sqlite3ValueIsOfClass(argv[0], (void(*)(void*))sqlite3RCStrUnref) ){
+    p->sParse.zJson = sqlite3RCStrRef((char*)z);
+  }else{
     n = sqlite3_value_bytes(argv[0]);
-  p->zJson = sqlite3_malloc64( n+1 );
+    p->sParse.zJson = sqlite3RCStrNew( n+1 );
-  if( p->zJson==0 ) return SQLITE_NOMEM;
+    if( p->sParse.zJson==0 ) return SQLITE_NOMEM;
-  memcpy(p->zJson, z, (size_t)n+1);
+    memcpy(p->sParse.zJson, z, (size_t)n+1);
-  if( jsonParse(&p->sParse, 0, p->zJson) ){
+  }
+  p->sParse.bJsonIsRCStr = 1;
+  p->zJson = p->sParse.zJson;
+  if( jsonParse(&p->sParse, 0) ){
     int rc = SQLITE_NOMEM;
     if( p->sParse.oom==0 ){
       sqlite3_free(cur->pVtab->zErrMsg);