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Revise the implementation of OP_Once so that it is smaller, faster, and uses

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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
2016-09-18 16:08:10 +00:00
parent 598f7c59e1
commit 9e5eb9c8cc
12 changed files with 53 additions and 56 deletions
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4
src/vdbeInt.h
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@@ -157,7 +157,6 @@ struct VdbeFrame {
Op *aOp; /* Program instructions for parent frame */
i64 *anExec; /* Event counters from parent frame */
Mem *aMem; /* Array of memory cells for parent frame */
u8 *aOnceFlag; /* Array of OP_Once flags for parent frame */
VdbeCursor **apCsr; /* Array of Vdbe cursors for parent frame */
void *token; /* Copy of SubProgram.token */
i64 lastRowid; /* Last insert rowid (sqlite3.lastRowid) */
@@ -166,7 +165,6 @@ struct VdbeFrame {
int pc; /* Program Counter in parent (calling) frame */
int nOp; /* Size of aOp array */
int nMem; /* Number of entries in aMem */
int nOnceFlag; /* Number of entries in aOnceFlag */
int nChildMem; /* Number of memory cells for child frame */
int nChildCsr; /* Number of cursors for child frame */
int nChange; /* Statement changes (Vdbe.nChange) */
@@ -410,8 +408,6 @@ struct Vdbe {
int nFrame; /* Number of frames in pFrame list */
u32 expmask; /* Binding to these vars invalidates VM */
SubProgram *pProgram; /* Linked list of all sub-programs used by VM */
int nOnceFlag; /* Size of array aOnceFlag[] */
u8 *aOnceFlag; /* Flags for OP_Once */
AuxData *pAuxData; /* Linked list of auxdata allocations */
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
i64 *anExec; /* Number of times each op has been executed */