mirror of https://github.com/sqlite/sqlite
Revise the implementation of OP_Once so that it is smaller, faster, and uses
less memory. This also fixes an obscure bug introduced 3 days ago by check-in [5990a1bdb4a073]. FossilOrigin-Name: 6bf5ba10d28f1b0a32aa9a560ae3143a1235eadb
This commit is contained in:
drh
parent
598f7c59e1
commit
9e5eb9c8cc
32
manifest
32
manifest
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@ -1,5 +1,5 @@
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C Minor\senhancement\sto\sthe\sTclKit\sbatch\stool:\sit\sshould\sdownload\sthe\sTclKit\sEXE\salone\swhen\sthe\sTCLKIT_NOENV\senvironment\svariable\sis\sset.
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D 2016-09-17T22:46:13.833
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C Revise\sthe\simplementation\sof\sOP_Once\sso\sthat\sit\sis\ssmaller,\sfaster,\sand\suses\nless\smemory.\s\sThis\salso\sfixes\san\sobscure\sbug\sintroduced\s3\sdays\sago\sby\scheck-in\n[5990a1bdb4a073].
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D 2016-09-18T16:08:10.162
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F Makefile.in 6fd48ffcf7c2deea7499062d1f3747f986c19678
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F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
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F Makefile.msc e1aa788e84f926e42239ee167c53f785bedacacd
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@ -339,11 +339,11 @@ F src/ctime.c e77f3dc297b4b65c96da78b4ae4272fdfae863d7
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F src/date.c 95c9a8d00767e7221a8e9a31f4e913fc8029bf6b
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F src/dbstat.c 19ee7a4e89979d4df8e44cfac7a8f905ec89b77d
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F src/delete.c e91a11e0e86a13ce1917ca5ad7cf14c37ba31e59
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F src/expr.c c1de78269522de39f6ad877ab0810a5d48f91f34
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F src/expr.c 5f6c8263b021853aef5a43e920efebd0b94de394
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F src/fault.c 160a0c015b6c2629d3899ed2daf63d75754a32bb
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F src/fkey.c e2be0968c1adc679c87e467aa5b4f167588f38a8
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F src/func.c 29cc9acb170ec1387b9f63eb52cd85f8de96c771
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F src/global.c c45ea22aff29334f6a9ec549235ac3357c970015
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F src/global.c 2917bbc488201b791e5f5dd43d8d2a3ccc315da7
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F src/hash.c 55b5fb474100cee0b901edaf203e26c970940f36
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F src/hash.h ab34c5c54a9e9de2e790b24349ba5aab3dbb4fd4
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F src/hwtime.h 747c1bbe9df21a92e9c50f3bbec1de841dc5e5da
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@ -351,7 +351,7 @@ F src/in-operator.md 10cd8f4bcd225a32518407c2fb2484089112fd71
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F src/insert.c 427e96ff168b6b187a52c3d06b9f9e41f6ffb212
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F src/legacy.c 75d3023be8f0d2b99d60f905090341a03358c58e
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F src/loadext.c 5d6642d141c07d366e43d359e94ec9de47add41d
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F src/main.c 9821bb4d2399bc5a0b8a5dfc06bede2d1520255c
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F src/main.c 14fb66eeb2eea477f9e79434fde3cca3aff0ea5c
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F src/malloc.c 1443d1ad95d67c21d77af7ae3f44678252f0efec
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F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
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F src/mem1.c 6919bcf12f221868ea066eec27e579fed95ce98b
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@ -388,10 +388,10 @@ F src/resolve.c 3c3cf0dc719cd2a32ab5c1e10c26481dd565492e
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F src/rowset.c 7b7e7e479212e65b723bf40128c7b36dc5afdfac
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F src/select.c 244f9cc5e4662987cd2ef5c22d1b7027560f3425
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F src/shell.c b80396d2fadce4681397707e30078bf416e1dec2
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F src/sqlite.h.in 46ed821aeed0ba45559fb15597d9a400083154a2
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F src/sqlite.h.in 2683a291ed8db5228024267be6421f0de507b80e
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F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
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F src/sqlite3ext.h 8648034aa702469afb553231677306cc6492a1ae
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F src/sqliteInt.h c9e010a79ab4ed7bdc910a24d8f08f3c6d5f822c
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F src/sqliteInt.h 1abb4501bbc28c9badf0ebc1e99bd66585ba04f0
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F src/sqliteLimit.h c0373387c287c8d0932510b5547ecde31b5da247
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F src/status.c a9e66593dfb28a9e746cba7153f84d49c1ddc4b1
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F src/table.c 5226df15ab9179b9ed558d89575ea0ce37b03fc9
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@ -448,16 +448,16 @@ F src/test_wsd.c 41cadfd9d97fe8e3e4e44f61a4a8ccd6f7ca8fe9
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F src/threads.c 4ae07fa022a3dc7c5beb373cf744a85d3c5c6c3c
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F src/tokenize.c 78c8085bc7af1922aa687f0f4bbd716821330de5
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F src/treeview.c f51b75a28b377adde9f79bc3deb6c7770bcf97c0
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F src/trigger.c cae81f6c65c4977bc2cbd27d43bfee478710853c
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F src/trigger.c 3419bb9862983d84d70735fb4c94b21b934cd0c5
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F src/update.c 8179e699dbd45b92934fd02d3d8e3732e8da8802
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F src/utf.c 699001c79f28e48e9bcdf8a463da029ea660540c
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F src/util.c 810ec3f22e2d1b62e66c30fe3621ebdedd23584d
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F src/vacuum.c 913970b9d86dd6c2b8063ef1af421880f1464ec3
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F src/vdbe.c bd7e890b2d6e2c93c808e5cf0f8e9fb26198d0fc
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F src/vdbe.h 67bc551f7faf04c33493892e4b378aada823ed10
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F src/vdbeInt.h c59381049af5c7751a83456c39b80d1a6fde1f9d
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F src/vdbe.c cdac9f8c53e2992816809a45910ff33b6122c191
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F src/vdbe.h c044be7050ac6bf596eecc6ab159f5dbc020a3b7
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F src/vdbeInt.h d21f14721dd87975dc9e3bcdbf504f9c098cf611
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F src/vdbeapi.c a32d61b7dd05e6890d8fd44d2805f55e2f5ba9f3
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F src/vdbeaux.c 12831f89de66a23d575d129dc1bda543a09a80c7
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F src/vdbeaux.c 66054df369ca76530b6b84e6fce2f847dc99a9b1
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F src/vdbeblob.c 3e82a797b60c3b9fed7b8de8c539ca7607874937
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F src/vdbemem.c 357caac1a404f37ee6087b17613f92107c13f733
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F src/vdbesort.c 91fda3909326860382b0ca8aa251e609c6a9d62c
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@ -1525,7 +1525,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
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F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
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F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
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P 63962e2a927963575be74c3ce11f39f722c07c72
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R a636a72a27c00683275c0e840ed0e183
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U mistachkin
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Z c511a2952b921071fe5b6c44565784ab
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P baceb988c6f4e93134e6a63173e846af2b73531a
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R 305c67fde695fcddb65717c9957658ad
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U drh
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Z 45869286482c6f2c4387b12de5cab0cb
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@ -1 +1 @@
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baceb988c6f4e93134e6a63173e846af2b73531a
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6bf5ba10d28f1b0a32aa9a560ae3143a1235eadb
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@ -1974,7 +1974,7 @@ static Select *isCandidateForInOpt(Expr *pX){
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*/
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int sqlite3CodeOnce(Parse *pParse){
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Vdbe *v = sqlite3GetVdbe(pParse); /* Virtual machine being coded */
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return sqlite3VdbeAddOp1(v, OP_Once, pParse->nOnce++);
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return sqlite3VdbeAddOp0(v, OP_Once);
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}
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#ifndef SQLITE_OMIT_SUBQUERY
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@ -225,7 +225,8 @@ SQLITE_WSD struct Sqlite3Config sqlite3Config = {
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#ifndef SQLITE_OMIT_BUILTIN_TEST
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0, /* xTestCallback */
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#endif
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0 /* bLocaltimeFault */
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0, /* bLocaltimeFault */
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0x7ffffffe /* iOnceResetThreshold */
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};
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/*
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@ -3784,6 +3784,15 @@ int sqlite3_test_control(int op, ...){
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break;
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}
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/* Set the threshold at which OP_Once counters reset back to zero.
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** By default this is 0xfffffffe (over 2 billion), but that value is
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** too big to test in a reasonable amount of time, so this control is
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** provided to set a small and easily reachable reset value.
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*/
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case SQLITE_TESTCTRL_ONCE_RESET_THRESHOLD: {
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sqlite3GlobalConfig.iOnceResetThreshold = va_arg(ap, int);
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break;
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}
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/* sqlite3_test_control(SQLITE_TESTCTRL_VDBE_COVERAGE, xCallback, ptr);
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**
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@ -6717,6 +6717,7 @@ int sqlite3_test_control(int op, ...);
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#define SQLITE_TESTCTRL_SCRATCHMALLOC 17
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#define SQLITE_TESTCTRL_LOCALTIME_FAULT 18
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#define SQLITE_TESTCTRL_EXPLAIN_STMT 19 /* NOT USED */
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#define SQLITE_TESTCTRL_ONCE_RESET_THRESHOLD 19
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#define SQLITE_TESTCTRL_NEVER_CORRUPT 20
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#define SQLITE_TESTCTRL_VDBE_COVERAGE 21
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#define SQLITE_TESTCTRL_BYTEORDER 22
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@ -2896,7 +2896,6 @@ struct Parse {
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int nTab; /* Number of previously allocated VDBE cursors */
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int nMem; /* Number of memory cells used so far */
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int nSet; /* Number of sets used so far */
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int nOnce; /* Number of OP_Once instructions so far */
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int nOpAlloc; /* Number of slots allocated for Vdbe.aOp[] */
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int szOpAlloc; /* Bytes of memory space allocated for Vdbe.aOp[] */
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int iFixedOp; /* Never back out opcodes iFixedOp-1 or earlier */
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@ -3230,6 +3229,7 @@ struct Sqlite3Config {
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int (*xTestCallback)(int); /* Invoked by sqlite3FaultSim() */
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#endif
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int bLocaltimeFault; /* True to fail localtime() calls */
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int iOnceResetThreshold; /* When to reset OP_Once counters */
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};
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/*
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@ -879,7 +879,6 @@ static TriggerPrg *codeRowTrigger(
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}
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pProgram->nMem = pSubParse->nMem;
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pProgram->nCsr = pSubParse->nTab;
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pProgram->nOnce = pSubParse->nOnce;
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pProgram->token = (void *)pTrigger;
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pPrg->aColmask[0] = pSubParse->oldmask;
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pPrg->aColmask[1] = pSubParse->newmask;
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42
src/vdbe.c
42
src/vdbe.c
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@ -2332,22 +2332,18 @@ case OP_BitNot: { /* same as TK_BITNOT, in1, out2 */
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/* Opcode: Once P1 P2 * * *
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**
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** Check the "once" flag number P1. If it is set, jump to instruction P2.
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** Otherwise, set the flag and fall through to the next instruction.
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** In other words, this opcode causes all following opcodes up through P2
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** (but not including P2) to run just once and to be skipped on subsequent
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** times through the loop.
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**
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** All "once" flags are initially cleared whenever a prepared statement
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** first begins to run.
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** If the P1 value is equal to the P1 value on the OP_Init opcode at
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** instruction 0, then jump to P2. If the two P1 values differ, then
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** set the P1 value on this opcode to equal the P1 value on the OP_Init
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** and fall through.
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*/
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case OP_Once: { /* jump */
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assert( pOp->p1<p->nOnceFlag );
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VdbeBranchTaken(p->aOnceFlag[pOp->p1]!=0, 2);
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if( p->aOnceFlag[pOp->p1] ){
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assert( p->aOp[0].opcode==OP_Init );
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VdbeBranchTaken(p->aOp[0].p1==pOp->p1, 2);
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if( p->aOp[0].p1==pOp->p1 ){
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goto jump_to_p2;
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}else{
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p->aOnceFlag[pOp->p1] = 1;
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pOp->p1 = p->aOp[0].p1;
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}
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break;
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}
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@ -5790,8 +5786,7 @@ case OP_Program: { /* jump */
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if( pProgram->nCsr==0 ) nMem++;
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nByte = ROUND8(sizeof(VdbeFrame))
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+ nMem * sizeof(Mem)
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+ pProgram->nCsr * sizeof(VdbeCursor *)
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+ pProgram->nOnce * sizeof(u8);
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+ pProgram->nCsr * sizeof(VdbeCursor *);
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pFrame = sqlite3DbMallocZero(db, nByte);
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if( !pFrame ){
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goto no_mem;
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@ -5811,8 +5806,6 @@ case OP_Program: { /* jump */
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pFrame->aOp = p->aOp;
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pFrame->nOp = p->nOp;
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pFrame->token = pProgram->token;
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pFrame->aOnceFlag = p->aOnceFlag;
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pFrame->nOnceFlag = p->nOnceFlag;
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#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
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pFrame->anExec = p->anExec;
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#endif
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@ -5846,13 +5839,10 @@ case OP_Program: { /* jump */
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p->apCsr = (VdbeCursor **)&aMem[p->nMem];
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p->aOp = aOp = pProgram->aOp;
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p->nOp = pProgram->nOp;
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p->aOnceFlag = (u8 *)&p->apCsr[p->nCursor];
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p->nOnceFlag = pProgram->nOnce;
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#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
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p->anExec = 0;
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#endif
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pOp = &aOp[-1];
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memset(p->aOnceFlag, 0, p->nOnceFlag);
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break;
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}
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@ -6819,7 +6809,7 @@ case OP_MaxPgcnt: { /* out2 */
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#endif
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/* Opcode: Init * P2 * P4 *
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/* Opcode: Init P1 P2 * P4 *
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** Synopsis: Start at P2
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**
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** Programs contain a single instance of this opcode as the very first
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** Or if P4 is blank, use the string returned by sqlite3_sql().
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**
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** If P2 is not zero, jump to instruction P2.
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**
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** Increment the value of P1 so that OP_Once opcodes will jump the
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** first time they are evaluated for this run.
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*/
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case OP_Init: { /* jump */
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char *zTrace;
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int i;
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/* If the P4 argument is not NULL, then it must be an SQL comment string.
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** The "--" string is broken up to prevent false-positives with srcck1.c.
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@ -6844,6 +6838,7 @@ case OP_Init: { /* jump */
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** sqlite3_expanded_sql(P) otherwise.
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*/
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assert( pOp->p4.z==0 || strncmp(pOp->p4.z, "-" "- ", 3)==0 );
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assert( pOp==p->aOp ); /* Always instruction 0 */
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#ifndef SQLITE_OMIT_TRACE
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if( (db->mTrace & (SQLITE_TRACE_STMT|SQLITE_TRACE_LEGACY))!=0
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@ -6881,6 +6876,13 @@ case OP_Init: { /* jump */
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#endif /* SQLITE_DEBUG */
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#endif /* SQLITE_OMIT_TRACE */
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assert( pOp->p2>0 );
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if( pOp->p1>=sqlite3GlobalConfig.iOnceResetThreshold ){
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for(i=1; i<p->nOp; i++){
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if( p->aOp[i].opcode==OP_Once ) p->aOp[i].p1 = 0;
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}
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pOp->p1 = 0;
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}
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pOp->p1++;
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goto jump_to_p2;
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}
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@ -88,7 +88,6 @@ struct SubProgram {
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int nOp; /* Elements in aOp[] */
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int nMem; /* Number of memory cells required */
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int nCsr; /* Number of cursors required */
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int nOnce; /* Number of OP_Once instructions */
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void *token; /* id that may be used to recursive triggers */
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SubProgram *pNext; /* Next sub-program already visited */
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};
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@ -157,7 +157,6 @@ struct VdbeFrame {
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Op *aOp; /* Program instructions for parent frame */
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i64 *anExec; /* Event counters from parent frame */
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Mem *aMem; /* Array of memory cells for parent frame */
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u8 *aOnceFlag; /* Array of OP_Once flags for parent frame */
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VdbeCursor **apCsr; /* Array of Vdbe cursors for parent frame */
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void *token; /* Copy of SubProgram.token */
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i64 lastRowid; /* Last insert rowid (sqlite3.lastRowid) */
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@ -166,7 +165,6 @@ struct VdbeFrame {
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int pc; /* Program Counter in parent (calling) frame */
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int nOp; /* Size of aOp array */
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int nMem; /* Number of entries in aMem */
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int nOnceFlag; /* Number of entries in aOnceFlag */
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int nChildMem; /* Number of memory cells for child frame */
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int nChildCsr; /* Number of cursors for child frame */
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int nChange; /* Statement changes (Vdbe.nChange) */
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@ -410,8 +408,6 @@ struct Vdbe {
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int nFrame; /* Number of frames in pFrame list */
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u32 expmask; /* Binding to these vars invalidates VM */
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SubProgram *pProgram; /* Linked list of all sub-programs used by VM */
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int nOnceFlag; /* Size of array aOnceFlag[] */
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u8 *aOnceFlag; /* Flags for OP_Once */
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AuxData *pAuxData; /* Linked list of auxdata allocations */
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#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
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i64 *anExec; /* Number of times each op has been executed */
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@ -1869,7 +1869,6 @@ void sqlite3VdbeMakeReady(
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int nMem; /* Number of VM memory registers */
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int nCursor; /* Number of cursors required */
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int nArg; /* Number of arguments in subprograms */
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int nOnce; /* Number of OP_Once instructions */
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int n; /* Loop counter */
|
||||
struct ReusableSpace x; /* Reusable bulk memory */
|
||||
|
||||
|
|
@ -1884,8 +1883,6 @@ void sqlite3VdbeMakeReady(
|
|||
nMem = pParse->nMem;
|
||||
nCursor = pParse->nTab;
|
||||
nArg = pParse->nMaxArg;
|
||||
nOnce = pParse->nOnce;
|
||||
if( nOnce==0 ) nOnce = 1; /* Ensure at least one byte in p->aOnceFlag[] */
|
||||
|
||||
/* Each cursor uses a memory cell. The first cursor (cursor 0) can
|
||||
** use aMem[0] which is not otherwise used by the VDBE program. Allocate
|
||||
|
|
@ -1932,7 +1929,6 @@ void sqlite3VdbeMakeReady(
|
|||
p->aVar = allocSpace(&x, p->aVar, nVar*sizeof(Mem));
|
||||
p->apArg = allocSpace(&x, p->apArg, nArg*sizeof(Mem*));
|
||||
p->apCsr = allocSpace(&x, p->apCsr, nCursor*sizeof(VdbeCursor*));
|
||||
p->aOnceFlag = allocSpace(&x, p->aOnceFlag, nOnce);
|
||||
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
|
||||
p->anExec = allocSpace(&x, p->anExec, p->nOp*sizeof(i64));
|
||||
#endif
|
||||
|
|
@ -1942,7 +1938,6 @@ void sqlite3VdbeMakeReady(
|
|||
}while( !db->mallocFailed );
|
||||
|
||||
p->nCursor = nCursor;
|
||||
p->nOnceFlag = nOnce;
|
||||
if( p->aVar ){
|
||||
p->nVar = (ynVar)nVar;
|
||||
for(n=0; n<nVar; n++){
|
||||
|
|
@ -2030,8 +2025,6 @@ int sqlite3VdbeFrameRestore(VdbeFrame *pFrame){
|
|||
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
|
||||
v->anExec = pFrame->anExec;
|
||||
#endif
|
||||
v->aOnceFlag = pFrame->aOnceFlag;
|
||||
v->nOnceFlag = pFrame->nOnceFlag;
|
||||
v->aOp = pFrame->aOp;
|
||||
v->nOp = pFrame->nOp;
|
||||
v->aMem = pFrame->aMem;
|
||||
|
|
@ -2569,11 +2562,8 @@ int sqlite3VdbeHalt(Vdbe *p){
|
|||
** one, or the complete transaction if there is no statement transaction.
|
||||
*/
|
||||
|
||||
assert( p->aOnceFlag!=0 || db->mallocFailed );
|
||||
if( db->mallocFailed ){
|
||||
p->rc = SQLITE_NOMEM_BKPT;
|
||||
}else{
|
||||
memset(p->aOnceFlag, 0, p->nOnceFlag);
|
||||
}
|
||||
closeAllCursors(p);
|
||||
if( p->magic!=VDBE_MAGIC_RUN ){
|
||||
|
|
|
|||
Loading…
Reference in New Issue