Make sure all memory allocations are 8-byte aligned. Ticket #3040.

Note that the mem3.c memory allocator returns 4-byte aligned memory
allocations.  But as mem3.c is intended for use in 32-bit embedded
systems, we are not going to change that. (CVS 4978)

FossilOrigin-Name: d11e8e307af906db75ae7aede790464fabd06422

manifest

@@ -1,5 +1,5 @@
-C Add\ssource\sfile\stest_osinst.c.\sA\swrapper\svfs\swith\sinstrumentation\scapabilities.\s(CVS\s4977)
-D 2008-04-10T14:51:01
+C Make\ssure\sall\smemory\sallocations\sare\s8-byte\saligned.\s\sTicket\s#3040.\nNote\sthat\sthe\smem3.c\smemory\sallocator\sreturns\s4-byte\saligned\smemory\nallocations.\s\sBut\sas\smem3.c\sis\sintended\sfor\suse\sin\s32-bit\sembedded\nsystems,\swe\sare\snot\sgoing\sto\schange\sthat.\s(CVS\s4978)
+D 2008-04-10T14:57:25
 F Makefile.arm-wince-mingw32ce-gcc ac5f7b2cef0cd850d6f755ba6ee4ab961b1fadf7
 F Makefile.in b861627d91df5ee422c54237aa38296954dc0151
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -108,7 +108,7 @@ F src/main.c afcd42ba14d144034ed0e285bee100594f00b8fa
 F src/malloc.c 12c1ae98ef1eff34b13c9eb526e0b7b479e1e820
 F src/md5.c c5fdfa5c2593eaee2e32a5ce6c6927c986eaf217
 F src/mem1.c fc716ff521b6dd3e43eaa211967383308800e70a
-F src/mem2.c 84f7ac94dbf55b9ecec85980e74c6f3a87da795d
+F src/mem2.c 3656205111208a847e21d81a1d5b09a010164096
 F src/mem3.c 52547678a2ae50c203d54be1a5bf51eb02438a3f
 F src/mem4.c 45c328ec6dcb7e8d319cb383615b5fe547ca5409
 F src/mem5.c 11d98b76f77873aab86b543cbd1a8ddc4e680d58
@@ -179,7 +179,7 @@ F src/vdbe.c 444ab9ecc91f3c04b2b29ae604458426aa674fa6
 F src/vdbe.h f72201a0657d5f3d6cc008d1f8d9cc65768518c9
 F src/vdbeInt.h 0b96efdeecb0803e504bf1c16b198f87c91d6019
 F src/vdbeapi.c ab6e99f8a6b7fcb82c2c698da7a36762a7593f0a
-F src/vdbeaux.c 519ec819a8e549d087899f0c9a912afcdda762b4
+F src/vdbeaux.c 0aa2d8ede6bdb4379c36491c14d9779221bf196d
 F src/vdbeblob.c cc713c142c3d4952b380c98ee035f850830ddbdb
 F src/vdbefifo.c a30c237b2a3577e1415fb6e288cbb6b8ed1e5736
 F src/vdbemem.c 095e18f84b3171a5f2d71fa93a4bfc64220c1cfe
@@ -626,7 +626,7 @@ F www/tclsqlite.tcl 8be95ee6dba05eabcd27a9d91331c803f2ce2130
 F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
 F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
 F www/whentouse.tcl fc46eae081251c3c181bd79c5faef8195d7991a5
-P 55591fc49c8ab8146c1f3eff733e637501bff627
-R eb917bb84cf56955a047ec767653c982
-U danielk1977
-Z 1f007475942ab467fd58433a4982bf4d
+P d9a6b653d3cb608610f13d2492fe9b3887acb3b9
+R 5abecbe6fddd99e44f6149cafd5e65bd
+U drh
+Z cb5f0994d8c7c4628b79acd85cbbd54d

manifest.uuid

@@ -1 +1 @@
-d9a6b653d3cb608610f13d2492fe9b3887acb3b9
+d11e8e307af906db75ae7aede790464fabd06422

src/mem2.c

@@ -12,7 +12,7 @@
 ** This file contains the C functions that implement a memory
 ** allocation subsystem for use by SQLite.  
 **
-** $Id: mem2.c,v 1.25 2008/04/03 10:13:01 danielk1977 Exp $
+** $Id: mem2.c,v 1.26 2008/04/10 14:57:25 drh Exp $
 */
 #include "sqliteInt.h"
 
@@ -48,8 +48,8 @@
 ** MemBlockHdr.
 */
 struct MemBlockHdr {
+  i64 iSize;                          /* Size of this allocation */
   struct MemBlockHdr *pNext, *pPrev;  /* Linked list of all unfreed memory */
-  int iSize;                          /* Size of this allocation */
   char nBacktrace;                    /* Number of backtraces on this alloc */
   char nBacktraceSlots;               /* Available backtrace slots */
   short nTitle;                       /* Bytes of title; includes '\0' */
@@ -218,7 +218,7 @@ static struct MemBlockHdr *sqlite3MemsysGetHeader(void *pAllocation){
   p = (struct MemBlockHdr*)pAllocation;
   p--;
   assert( p->iForeGuard==FOREGUARD );
-  nReserve = (p->iSize+3)&~3;
+  nReserve = (p->iSize+7)&~7;
   pInt = (int*)pAllocation;
   pU8 = (u8*)pAllocation;
   assert( pInt[nReserve/sizeof(int)]==REARGUARD );
@@ -258,7 +258,7 @@ void *sqlite3_malloc(int nByte){
     if( mem.alarmCallback!=0 && mem.nowUsed+nByte>=mem.alarmThreshold ){
       sqlite3MemsysAlarm(nByte);
     }
-    nReserve = (nByte+3)&~3;
+    nReserve = (nByte+7)&~7;
     if( nReserve/8>NCSIZE-1 ){
       mem.sizeCnt[NCSIZE-1]++;
     }else{
@@ -413,7 +413,7 @@ void sqlite3MemdebugSettitle(const char *zTitle){
   if( n>=sizeof(mem.zTitle) ) n = sizeof(mem.zTitle)-1;
   memcpy(mem.zTitle, zTitle, n);
   mem.zTitle[n] = 0;
-  mem.nTitle = (n+3)&~3;
+  mem.nTitle = (n+7)&~7;
   sqlite3_mutex_leave(mem.mutex);
 }
 
@@ -444,7 +444,7 @@ void sqlite3MemdebugDump(const char *zFilename){
   for(pHdr=mem.pFirst; pHdr; pHdr=pHdr->pNext){
     char *z = (char*)pHdr;
     z -= pHdr->nBacktraceSlots*sizeof(void*) + pHdr->nTitle;
-    fprintf(out, "**** %d bytes at %p from %s ****\n", 
+    fprintf(out, "**** %lld bytes at %p from %s ****\n", 
             pHdr->iSize, &pHdr[1], pHdr->nTitle ? z : "???");
     if( pHdr->nBacktrace ){
       fflush(out);

src/vdbeaux.c

@@ -2065,6 +2065,9 @@ int sqlite3VdbeSerialGet(
   u32 serial_type,              /* Serial type to deserialize */
   Mem *pMem                     /* Memory cell to write value into */
 ){
+#ifndef SQLITE_MEMORY_SIZE
+  assert( (7&(int)pMem)==0 );   /* Verify 8-byte alignment.  Ticket #3040 */
+#endif
   switch( serial_type ){
     case 10:   /* Reserved for future use */
     case 11:   /* Reserved for future use */
@@ -2197,7 +2200,8 @@ UnpackedRecord *sqlite3VdbeRecordUnpack(
   u32 szHdr;
   Mem *pMem;
   
-  nByte = sizeof(*p) + sizeof(Mem)*(pKeyInfo->nField+1);
+  assert( sizeof(Mem)>sizeof(*p) );
+  nByte = sizeof(Mem)*(pKeyInfo->nField+2);
   if( nByte>szSpace ){
     p = sqlite3DbMallocRaw(pKeyInfo->db, nByte);
     if( p==0 ) return 0;
@@ -2209,7 +2213,7 @@ UnpackedRecord *sqlite3VdbeRecordUnpack(
   p->pKeyInfo = pKeyInfo;
   p->nField = pKeyInfo->nField + 1;
   p->needDestroy = 1;
-  p->aMem = pMem = (Mem*)&p[1];
+  p->aMem = pMem = &((Mem*)p)[1];
   idx = GetVarint(aKey, szHdr);
   d = szHdr;
   i = 0;