Fix harmless compiler warnings and enhance performance the parser.

FossilOrigin-Name: 285633da6d188547e52f07779e209c9e5f3dc33ce0668e14858f3337889ef4b8

manifest

@@ -1,5 +1,5 @@
-C Performance\soptimization\sin\sthe\sJSON\sparser.
-D 2023-12-01T22:01:26.348
+C Fix\sharmless\scompiler\swarnings\sand\senhance\sperformance\sthe\sparser.
+D 2023-12-02T01:06:33.225
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -688,7 +688,7 @@ 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 d524f2f13338f84327641edd5b422252d7c93a4f7fc57f083a0d41c767561554
+F src/json.c 58c3ded3bdc94125235a805214016147ecd63f8173cff19a7084c9fb0ea0ff9c
 F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
 F src/loadext.c 7432c944ff197046d67a1207790a1b13eec4548c85a9457eb0896bb3641dfb36
 F src/main.c 1b89f3de98d1b59fec5bac1d66d6ece21f703821b8eaa0d53d9604c35309f6f9
@@ -2145,8 +2145,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 443a3f3a8e64d81cad8300a30e2cc57c4e39f69b5669ac8b550c590ae9f1134a
-R a25493165248fa490fe7a3cb972ea0d2
+P 68d191f40e708962ec88e0c245b4496bc4a671300484b1cc0f3fc7e6d199a6e6
+R 398de78fe5dea0e1b0bc6535ce40a9fc
 U drh
-Z 51cb7fe7cb06e4de05d17231c2159ec6
+Z c1eeb98e2ab1260bdea70d2e8aff46bd
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-68d191f40e708962ec88e0c245b4496bc4a671300484b1cc0f3fc7e6d199a6e6
+285633da6d188547e52f07779e209c9e5f3dc33ce0668e14858f3337889ef4b8

src/json.c

@@ -1075,6 +1075,17 @@ static int jsonBlobAppendNBytes(JsonParse *pParse, const u8 *aData, u32 N){
   return 0;
 }
 
+static void jsonBlobAppendNodeType(JsonParse*,u8,u32);
+static SQLITE_NOINLINE void jsonBlobExpandAndAppendNodeType(
+  JsonParse *pParse,
+  u8 eType,
+  u32 szPayload
+){
+  if( jsonBlobExpand(pParse, pParse->nBlob+szPayload+9) ) return;
+  jsonBlobAppendNodeType(pParse, eType, szPayload);
+}
+
+
 /* Append an node type byte together with the payload size.
 */
 static void jsonBlobAppendNodeType(
@@ -1082,25 +1093,31 @@ static void jsonBlobAppendNodeType(
   u8 eType,
   u32 szPayload
 ){
-  u8 a[5];
+  u8 *a;
+  if( pParse->nBlob+szPayload+9 > pParse->nBlobAlloc ){
+    jsonBlobExpandAndAppendNodeType(pParse,eType,szPayload);
+    return;
+  }
+  a = &pParse->aBlob[pParse->nBlob];
   if( szPayload<=11 ){
-    jsonBlobAppendOneByte(pParse, eType | (szPayload<<4));
+    a[0] = eType | (szPayload<<4);
+    pParse->nBlob += 1;
   }else if( szPayload<=0xff ){
     a[0] = eType | 0xc0;
     a[1] = szPayload & 0xff;
-    jsonBlobAppendNBytes(pParse, a, 2);
+    pParse->nBlob += 2;
   }else if( szPayload<=0xffff ){
     a[0] = eType | 0xd0;
     a[1] = (szPayload >> 8) & 0xff;
     a[2] = szPayload & 0xff;
-    jsonBlobAppendNBytes(pParse, a, 3);
+    pParse->nBlob += 3;
   }else{
     a[0] = eType | 0xe0;
     a[1] = (szPayload >> 24) & 0xff;
     a[2] = (szPayload >> 16) & 0xff;
     a[3] = (szPayload >> 8) & 0xff;
     a[4] = szPayload & 0xff;
-    jsonBlobAppendNBytes(pParse, a, 5);
+    pParse->nBlob += 5;
   }
 }
 
@@ -2169,12 +2186,9 @@ static u32 jsonLookupBlobStep(
       u32 nIns;          /* Total bytes to insert (label+value) */
       JsonParse v;       /* BLOB encoding of the value to be inserted */
       JsonParse ix;      /* Header of the label to be inserted */
-      u8 aLabel[16];     /* Buffer space for ix */
       testcase( pParse->eEdit==JEDIT_INS );
       testcase( pParse->eEdit==JEDIT_SET );
       memset(&ix, 0, sizeof(ix));
-      ix.aBlob = aLabel;
-      ix.nBlobAlloc = sizeof(aLabel);
       jsonBlobAppendNodeType(&ix,JSONB_TEXTRAW, nKey);
       memset(&v, 0, sizeof(v));
       if( zPath[i]==0 ){
@@ -2190,9 +2204,11 @@ static u32 jsonLookupBlobStep(
         if( JSON_BLOB_ISERROR(rc) || v.oom ){
           pParse->oom |= v.oom;
           jsonParseReset(&v);
+          jsonParseReset(&ix);
           return rc;
         }
       }
+      pParse->oom |= ix.oom;
       if( jsonBlobMakeEditable(pParse, ix.nBlob+nKey+v.nBlob) ){
         nIns = ix.nBlob + nKey + v.nBlob;
         jsonBlobEdit(pParse, j, 0, 0, nIns);
@@ -2204,6 +2220,7 @@ static u32 jsonLookupBlobStep(
         if( pParse->delta ) jsonAfterEditSizeAdjust(pParse, iRoot);
       }
       jsonParseReset(&v);
+      jsonParseReset(&ix);
       return j;
     }
   }else if( zPath[0]=='[' ){
@@ -3323,11 +3340,11 @@ static int jsonMergePatchBlob(
   u32 iTEndBE;      /* Original first byte past end of target, before edit */
   u32 iTEnd;        /* Current first byte past end of target */
   u8 eTLabel;       /* Node type of the target label */
-  u32 iTLabel;      /* Index of the label */
-  u32 nTLabel;      /* Header size in bytes for the target label */
+  u32 iTLabel = 0;  /* Index of the label */
+  u32 nTLabel = 0;  /* Header size in bytes for the target label */
   u32 szTLabel;     /* Size of the target label payload */
-  u32 iTValue;      /* Index of the target value */
-  u32 nTValue;      /* Header size of the target value */
+  u32 iTValue = 0;  /* Index of the target value */
+  u32 nTValue = 0;  /* Header size of the target value */
   u32 szTValue;     /* Payload size for the target value */
 
   u32 iPCursor;     /* Cursor position while scanning the patch */