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Improved comments and extra assert() statements on the OP_Savepoint opcode,

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just to make the code a little easier to read and reason about.

FossilOrigin-Name: e80b2d9fcbc82ae5dc8a1fc13196f9a30bdb504eb5a5c131d136a78bbd5bbe7b
This commit is contained in:
drh
2019-05-10 14:03:07 +00:00
parent 7e6dc5d908
commit 2ce9b6bcd5
3 changed files with 13 additions and 9 deletions
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12
manifest
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@@ -1,5 +1,5 @@
C Fix\sthe\sprevious\scheck-in\s[db9acef14d492121]\sso\sthat\sthe\samalgamation\sbuild\nworks\sfor\ssystems\sfor\swhich\slack\sHAVE_ISNAN.
D 2019-05-10T12:14:51.652
C Improved\scomments\sand\sextra\sassert()\sstatements\son\sthe\sOP_Savepoint\sopcode,\njust\sto\smake\sthe\scode\sa\slittle\seasier\sto\sread\sand\sreason\sabout.
D 2019-05-10T14:03:07.714
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F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -593,7 +593,7 @@ F src/upsert.c 0dd81b40206841814d46942a7337786932475f085716042d0cb2fc7791bf8ca4
F src/utf.c 2f0fac345c7660d5c5bd3df9e9d8d33d4c27f366bcfb09e07443064d751a0507
F src/util.c 4c0669e042b4e50a08a9e5fd14cecc76e5f877efa288533dccddb6fe98f4d6b5
F src/vacuum.c 82dcec9e7b1afa980288718ad11bc499651c722d7b9f32933c4d694d91cb6ebf
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F src/vdbeapi.c f9161e5c77f512fbb80091ce8af621d19c9556bda5e734cffaac1198407400da
@@ -1825,7 +1825,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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2
manifest.uuid
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@@ -1 +1 @@
3cc55e09e6c1de2059d97bdddf2fdfbdcc62c584b513f56faf9d3a39ef80cddd
e80b2d9fcbc82ae5dc8a1fc13196f9a30bdb504eb5a5c131d136a78bbd5bbe7b

8
src/vdbe.c
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@@ -3030,8 +3030,9 @@ case OP_Count: { /* out2 */
/* Opcode: Savepoint P1 * * P4 *
**
** Open, release or rollback the savepoint named by parameter P4, depending
** on the value of P1. To open a new savepoint, P1==0. To release (commit) an
** existing savepoint, P1==1, or to rollback an existing savepoint P1==2.
** on the value of P1. To open a new savepoint set P1==0 (SAVEPOINT_BEGIN).
** To release (commit) an existing savepoint set P1==1 (SAVEPOINT_RELEASE).
** To rollback an existing savepoint set P1==2 (SAVEPOINT_ROLLBACK).
*/
case OP_Savepoint: {
int p1; /* Value of P1 operand */
@@ -3099,6 +3100,7 @@ case OP_Savepoint: {
}
}
}else{
assert( p1==SAVEPOINT_RELEASE || p1==SAVEPOINT_ROLLBACK );
iSavepoint = 0;
/* Find the named savepoint. If there is no such savepoint, then an
@@ -3152,6 +3154,7 @@ case OP_Savepoint: {
if( rc!=SQLITE_OK ) goto abort_due_to_error;
}
}else{
assert( p1==SAVEPOINT_RELEASE );
isSchemaChange = 0;
}
for(ii=0; ii<db->nDb; ii++){
@@ -3188,6 +3191,7 @@ case OP_Savepoint: {
db->nSavepoint--;
}
}else{
assert( p1==SAVEPOINT_ROLLBACK );
db->nDeferredCons = pSavepoint->nDeferredCons;
db->nDeferredImmCons = pSavepoint->nDeferredImmCons;
}