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Split almost 1300 lines of code out of vdbe.c into separate files

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vdbeInt.h and vdbeaux.c. (CVS 1094)

FossilOrigin-Name: bfd69391d3d63675f206ffd8ff0401ea1cbcc073
This commit is contained in:
drh
2003-09-06 20:12:01 +00:00
parent 5045789694
commit 9a32464b54
6 changed files with 1353 additions and 1306 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
main.mk
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@@ -58,7 +58,7 @@ LIBOBJ = attach.o auth.o btree.o btree_rb.o build.o copy.o delete.o \
expr.o func.o hash.o insert.o \ expr.o func.o hash.o insert.o \
main.o opcodes.o os.o pager.o parse.o pragma.o printf.o random.o \ main.o opcodes.o os.o pager.o parse.o pragma.o printf.o random.o \
select.o table.o tokenize.o trigger.o update.o util.o \ select.o table.o tokenize.o trigger.o update.o util.o \
vacuum.o vdbe.o where.o tclsqlite.o vacuum.o vdbe.o vdbeaux.o where.o tclsqlite.o
# All of the source code files. # All of the source code files.
# #
@@ -97,6 +97,8 @@ SRC = \
$(TOP)/src/vacuum.c \ $(TOP)/src/vacuum.c \
$(TOP)/src/vdbe.c \ $(TOP)/src/vdbe.c \
$(TOP)/src/vdbe.h \ $(TOP)/src/vdbe.h \
$(TOP)/src/vdbeaux.c \
$(TOP)/src/vdbeInt.h \
$(TOP)/src/where.c $(TOP)/src/where.c
# Source code to the test files. # Source code to the test files.
@@ -121,9 +123,15 @@ HDR = \
opcodes.h \ opcodes.h \
$(TOP)/src/os.h \ $(TOP)/src/os.h \
$(TOP)/src/sqliteInt.h \ $(TOP)/src/sqliteInt.h \
$(TOP)/src/vdbe.h \ $(TOP)/src/vdbe.h \
parse.h parse.h
# Header files used by the VDBE submodule
#
VDBEHDR = \
$(HDR) \
$(TOP)/src/vdbeInt.h
# This is the default Makefile target. The objects listed here # This is the default Makefile target. The objects listed here
# are what get build when you type just "make" with no arguments. # are what get build when you type just "make" with no arguments.
# #
@@ -150,10 +158,10 @@ sqlite$(EXE): $(TOP)/src/shell.c libsqlite.a sqlite.h
# files are automatically generated. This target takes care of # files are automatically generated. This target takes care of
# all that automatic generation. # all that automatic generation.
# #
target_source: $(SRC) $(HDR) opcodes.c target_source: $(SRC) $(VDBEHDR) opcodes.c
rm -rf tsrc rm -rf tsrc
mkdir tsrc mkdir tsrc
cp $(SRC) $(HDR) tsrc cp $(SRC) $(VDBEHDR) tsrc
rm tsrc/sqlite.h.in tsrc/parse.y rm tsrc/sqlite.h.in tsrc/parse.y
cp parse.c opcodes.c tsrc cp parse.c opcodes.c tsrc
@@ -239,9 +247,12 @@ util.o: $(TOP)/src/util.c $(HDR)
vacuum.o: $(TOP)/src/vacuum.c $(HDR) vacuum.o: $(TOP)/src/vacuum.c $(HDR)
$(TCCX) -c $(TOP)/src/vacuum.c $(TCCX) -c $(TOP)/src/vacuum.c
vdbe.o: $(TOP)/src/vdbe.c $(HDR) vdbe.o: $(TOP)/src/vdbe.c $(VDBEHDR)
$(TCCX) -c $(TOP)/src/vdbe.c $(TCCX) -c $(TOP)/src/vdbe.c
vdbeaux.o: $(TOP)/src/vdbeaux.c $(VDBEHDR)
$(TCCX) -c $(TOP)/src/vdbeaux.c
where.o: $(TOP)/src/where.c $(HDR) where.o: $(TOP)/src/where.c $(HDR)
$(TCCX) -c $(TOP)/src/where.c $(TCCX) -c $(TOP)/src/where.c

16
manifest
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@@ -1,5 +1,5 @@
C The\sbeginnings\sof\schanges\sto\ssupport\spre-compiled\sSQL.\s\sMostly\suntested,\nthough\sall\sregression\stests\sto\spass.\s(CVS\s1093) C Split\salmost\s1300\slines\sof\scode\sout\sof\svdbe.c\sinto\sseparate\sfiles\nvdbeInt.h\sand\svdbeaux.c.\s(CVS\s1094)
D 2003-09-06T01:10:47 D 2003-09-06T20:12:01
F Makefile.in f7e916ae863393827fa6a4cb292e3398096edcf1 F Makefile.in f7e916ae863393827fa6a4cb292e3398096edcf1
F Makefile.linux-gcc b86a99c493a5bfb402d1d9178dcdc4bd4b32f906 F Makefile.linux-gcc b86a99c493a5bfb402d1d9178dcdc4bd4b32f906
F README f1de682fbbd94899d50aca13d387d1b3fd3be2dd F README f1de682fbbd94899d50aca13d387d1b3fd3be2dd
@@ -16,7 +16,7 @@ F doc/report1.txt a031aaf37b185e4fa540223cb516d3bccec7eeac
F install-sh 9d4de14ab9fb0facae2f48780b874848cbf2f895 F install-sh 9d4de14ab9fb0facae2f48780b874848cbf2f895
F libtool bbbea7d79c23323e4100103836028e4fad0d9242 F libtool bbbea7d79c23323e4100103836028e4fad0d9242
F ltmain.sh abfb9387049fff6996afc6e325736597795baf11 F ltmain.sh abfb9387049fff6996afc6e325736597795baf11
F main.mk d01843179ed14559adb75f7e2fe093c943d56756 F main.mk 6af144bac62d83899b71919c738fdf442a4f1c16
F publish.sh 86b5e8535830a2588f62ce1d5d1ef00e1dede23a F publish.sh 86b5e8535830a2588f62ce1d5d1ef00e1dede23a
F spec.template 238f7db425a78dc1bb7682e56e3834c7270a3f5e F spec.template 238f7db425a78dc1bb7682e56e3834c7270a3f5e
F sqlite.1 83f4a9d37bdf2b7ef079a82d54eaf2e3509ee6ea F sqlite.1 83f4a9d37bdf2b7ef079a82d54eaf2e3509ee6ea
@@ -61,8 +61,10 @@ F src/trigger.c 474581eaab388233df01bb019e558af2965decbf
F src/update.c 24260b4fda00c9726d27699a0561d53c0dccc397 F src/update.c 24260b4fda00c9726d27699a0561d53c0dccc397
F src/util.c f16efa2d60bfd4e31ae06b07ed149557e828d294 F src/util.c f16efa2d60bfd4e31ae06b07ed149557e828d294
F src/vacuum.c e4724eade07e4cf8897060a8cf632dbd92408eeb F src/vacuum.c e4724eade07e4cf8897060a8cf632dbd92408eeb
F src/vdbe.c b6a2b0a8eeca95cc29a9e07fb7d2cc3c1eaec468 F src/vdbe.c 00c547e77d4100b6671c1509df5993ab315a166c
F src/vdbe.h 3c51cb382316dbf3860e4ece72e658b4bf014501 F src/vdbe.h 3c51cb382316dbf3860e4ece72e658b4bf014501
F src/vdbeInt.h 15cd01061b2f0acb967bdc5195fe1e891bb707a1
F src/vdbeaux.c ebf5eab163fa8435e4fc24bcebe4eab4147d871b
F src/where.c 83b2a2d26d5c3bea33457a83e541bb1dcf7b1248 F src/where.c 83b2a2d26d5c3bea33457a83e541bb1dcf7b1248
F test/all.test 569a92a8ee88f5300c057cc4a8f50fbbc69a3242 F test/all.test 569a92a8ee88f5300c057cc4a8f50fbbc69a3242
F test/attach.test c26848402e7ac829e043e1fa5e0eb87032e5d81d F test/attach.test c26848402e7ac829e043e1fa5e0eb87032e5d81d
@@ -170,7 +172,7 @@ F www/speed.tcl 2f6b1155b99d39adb185f900456d1d592c4832b3
F www/sqlite.tcl 3c83b08cf9f18aa2d69453ff441a36c40e431604 F www/sqlite.tcl 3c83b08cf9f18aa2d69453ff441a36c40e431604
F www/tclsqlite.tcl b9271d44dcf147a93c98f8ecf28c927307abd6da F www/tclsqlite.tcl b9271d44dcf147a93c98f8ecf28c927307abd6da
F www/vdbe.tcl 9b9095d4495f37697fd1935d10e14c6015e80aa1 F www/vdbe.tcl 9b9095d4495f37697fd1935d10e14c6015e80aa1
P aaa84c6202f6e16828bcd6aff2e424f3dba1f82b P 912f47c72d3597c6d5acff765d94922bd660339a
R 0bb0019009c0a448d322679ad1dd5f73 R 197956f145d2d77ab02def05dccb6402
U drh U drh
Z 42cb329fb1ec590b60ca4f6b47463c49 Z 7934264d068323cc21204d69f10c800f

2
manifest.uuid
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@@ -1 +1 @@
912f47c72d3597c6d5acff765d94922bd660339a bfd69391d3d63675f206ffd8ff0401ea1cbcc073

1327
src/vdbe.c
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File diff suppressed because it is too large Load Diff

297
src/vdbeInt.h Normal file
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@@ -0,0 +1,297 @@
/*
** 2003 September 6
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This is the header file for information that is private to the
** VDBE. This information used to all be at the top of the single
** source code file "vdbe.c". When that file became too big (over
** 6000 lines long) it was split up into several smaller files and
** this header information was factored out.
*/
/*
** The makefile scans this source file and creates the following
** array of string constants which are the names of all VDBE opcodes.
** This array is defined in a separate source code file named opcode.c
** which is automatically generated by the makefile.
*/
extern char *sqliteOpcodeNames[];
/*
** SQL is translated into a sequence of instructions to be
** executed by a virtual machine. Each instruction is an instance
** of the following structure.
*/
typedef struct VdbeOp Op;
/*
** Boolean values
*/
typedef unsigned char Bool;
/*
** A cursor is a pointer into a single BTree within a database file.
** The cursor can seek to a BTree entry with a particular key, or
** loop over all entries of the Btree. You can also insert new BTree
** entries or retrieve the key or data from the entry that the cursor
** is currently pointing to.
**
** Every cursor that the virtual machine has open is represented by an
** instance of the following structure.
**
** If the Cursor.isTriggerRow flag is set it means that this cursor is
** really a single row that represents the NEW or OLD pseudo-table of
** a row trigger. The data for the row is stored in Cursor.pData and
** the rowid is in Cursor.iKey.
*/
struct Cursor {
BtCursor *pCursor; /* The cursor structure of the backend */
int lastRecno; /* Last recno from a Next or NextIdx operation */
int nextRowid; /* Next rowid returned by OP_NewRowid */
Bool recnoIsValid; /* True if lastRecno is valid */
Bool keyAsData; /* The OP_Column command works on key instead of data */
Bool atFirst; /* True if pointing to first entry */
Bool useRandomRowid; /* Generate new record numbers semi-randomly */
Bool nullRow; /* True if pointing to a row with no data */
Bool nextRowidValid; /* True if the nextRowid field is valid */
Bool pseudoTable; /* This is a NEW or OLD pseudo-tables of a trigger */
Btree *pBt; /* Separate file holding temporary table */
int nData; /* Number of bytes in pData */
char *pData; /* Data for a NEW or OLD pseudo-table */
int iKey; /* Key for the NEW or OLD pseudo-table row */
};
typedef struct Cursor Cursor;
/*
** A sorter builds a list of elements to be sorted. Each element of
** the list is an instance of the following structure.
*/
typedef struct Sorter Sorter;
struct Sorter {
int nKey; /* Number of bytes in the key */
char *zKey; /* The key by which we will sort */
int nData; /* Number of bytes in the data */
char *pData; /* The data associated with this key */
Sorter *pNext; /* Next in the list */
};
/*
** Number of buckets used for merge-sort.
*/
#define NSORT 30
/*
** Number of bytes of string storage space available to each stack
** layer without having to malloc. NBFS is short for Number of Bytes
** For Strings.
*/
#define NBFS 32
/*
** A single level of the stack is an instance of the following
** structure. Except, string values are stored on a separate
** list of of pointers to character. The reason for storing
** strings separately is so that they can be easily passed
** to the callback function.
*/
struct Stack {
int i; /* Integer value */
int n; /* Number of characters in string value, including '\0' */
int flags; /* Some combination of STK_Null, STK_Str, STK_Dyn, etc. */
double r; /* Real value */
char z[NBFS]; /* Space for short strings */
};
typedef struct Stack Stack;
/*
** Memory cells use the same structure as the stack except that space
** for an arbitrary string is added.
*/
struct Mem {
Stack s; /* All values of the memory cell besides string */
char *z; /* String value for this memory cell */
};
typedef struct Mem Mem;
/*
** Allowed values for Stack.flags
*/
#define STK_Null 0x0001 /* Value is NULL */
#define STK_Str 0x0002 /* Value is a string */
#define STK_Int 0x0004 /* Value is an integer */
#define STK_Real 0x0008 /* Value is a real number */
#define STK_Dyn 0x0010 /* Need to call sqliteFree() on zStack[] */
#define STK_Static 0x0020 /* zStack[] points to a static string */
#define STK_Ephem 0x0040 /* zStack[] points to an ephemeral string */
/* The following STK_ value appears only in AggElem.aMem.s.flag fields.
** It indicates that the corresponding AggElem.aMem.z points to a
** aggregate function context that needs to be finalized.
*/
#define STK_AggCtx 0x0040 /* zStack[] points to an agg function context */
/*
** The "context" argument for a installable function. A pointer to an
** instance of this structure is the first argument to the routines used
** implement the SQL functions.
**
** There is a typedef for this structure in sqlite.h. So all routines,
** even the public interface to SQLite, can use a pointer to this structure.
** But this file is the only place where the internal details of this
** structure are known.
**
** This structure is defined inside of vdbe.c because it uses substructures
** (Stack) which are only defined there.
*/
struct sqlite_func {
FuncDef *pFunc; /* Pointer to function information. MUST BE FIRST */
Stack s; /* Small strings, ints, and double values go here */
char *z; /* Space for holding dynamic string results */
void *pAgg; /* Aggregate context */
u8 isError; /* Set to true for an error */
u8 isStep; /* Current in the step function */
int cnt; /* Number of times that the step function has been called */
};
/*
** An Agg structure describes an Aggregator. Each Agg consists of
** zero or more Aggregator elements (AggElem). Each AggElem contains
** a key and one or more values. The values are used in processing
** aggregate functions in a SELECT. The key is used to implement
** the GROUP BY clause of a select.
*/
typedef struct Agg Agg;
typedef struct AggElem AggElem;
struct Agg {
int nMem; /* Number of values stored in each AggElem */
AggElem *pCurrent; /* The AggElem currently in focus */
HashElem *pSearch; /* The hash element for pCurrent */
Hash hash; /* Hash table of all aggregate elements */
FuncDef **apFunc; /* Information about aggregate functions */
};
struct AggElem {
char *zKey; /* The key to this AggElem */
int nKey; /* Number of bytes in the key, including '\0' at end */
Mem aMem[1]; /* The values for this AggElem */
};
/*
** A Set structure is used for quick testing to see if a value
** is part of a small set. Sets are used to implement code like
** this:
** x.y IN ('hi','hoo','hum')
*/
typedef struct Set Set;
struct Set {
Hash hash; /* A set is just a hash table */
HashElem *prev; /* Previously accessed hash elemen */
};
/*
** A Keylist is a bunch of keys into a table. The keylist can
** grow without bound. The keylist stores the ROWIDs of database
** records that need to be deleted or updated.
*/
typedef struct Keylist Keylist;
struct Keylist {
int nKey; /* Number of slots in aKey[] */
int nUsed; /* Next unwritten slot in aKey[] */
int nRead; /* Next unread slot in aKey[] */
Keylist *pNext; /* Next block of keys */
int aKey[1]; /* One or more keys. Extra space allocated as needed */
};
/*
** An instance of the virtual machine. This structure contains the complete
** state of the virtual machine.
**
** The "sqlite_vm" structure pointer that is returned by sqlite_compile()
** is really a pointer to an instance of this structure.
*/
struct Vdbe {
sqlite *db; /* The whole database */
Vdbe *pPrev,*pNext; /* Linked list of VDBEs with the same Vdbe.db */
FILE *trace; /* Write an execution trace here, if not NULL */
int nOp; /* Number of instructions in the program */
int nOpAlloc; /* Number of slots allocated for aOp[] */
Op *aOp; /* Space to hold the virtual machine's program */
int nLabel; /* Number of labels used */
int nLabelAlloc; /* Number of slots allocated in aLabel[] */
int *aLabel; /* Space to hold the labels */
int tos; /* Index of top of stack */
Stack *aStack; /* The operand stack, except string values */
char **zStack; /* Text or binary values of the stack */
char **azColName; /* Becomes the 4th parameter to callbacks */
int nCursor; /* Number of slots in aCsr[] */
Cursor *aCsr; /* One element of this array for each open cursor */
Sorter *pSort; /* A linked list of objects to be sorted */
FILE *pFile; /* At most one open file handler */
int nField; /* Number of file fields */
char **azField; /* Data for each file field */
int nVariable; /* Number of entries in azVariable[] */
char **azVariable; /* Values for the OP_Variable opcode */
char *zLine; /* A single line from the input file */
int nLineAlloc; /* Number of spaces allocated for zLine */
int magic; /* Magic number for sanity checking */
int nMem; /* Number of memory locations currently allocated */
Mem *aMem; /* The memory locations */
Agg agg; /* Aggregate information */
int nSet; /* Number of sets allocated */
Set *aSet; /* An array of sets */
int nCallback; /* Number of callbacks invoked so far */
Keylist *pList; /* A list of ROWIDs */
int keylistStackDepth; /* The size of the "keylist" stack */
Keylist **keylistStack; /* The stack used by opcodes ListPush & ListPop */
int pc; /* The program counter */
int rc; /* Value to return */
unsigned uniqueCnt; /* Used by OP_MakeRecord when P2!=0 */
int errorAction; /* Recovery action to do in case of an error */
int undoTransOnError; /* If error, either ROLLBACK or COMMIT */
int inTempTrans; /* True if temp database is transactioned */
int returnStack[100]; /* Return address stack for OP_Gosub & OP_Return */
int returnDepth; /* Next unused element in returnStack[] */
int nResColumn; /* Number of columns in one row of the result set */
char **azResColumn; /* Values for one row of result */
int (*xCallback)(void*,int,char**,char**); /* Callback for SELECT results */
void *pCbArg; /* First argument to xCallback() */
int popStack; /* Pop the stack this much on entry to VdbeExec() */
char *zErrMsg; /* Error message written here */
u8 explain; /* True if EXPLAIN present on SQL command */
};
/*
** The following are allowed values for Vdbe.magic
*/
#define VDBE_MAGIC_INIT 0x26bceaa5 /* Building a VDBE program */
#define VDBE_MAGIC_RUN 0xbdf20da3 /* VDBE is ready to execute */
#define VDBE_MAGIC_HALT 0x519c2973 /* VDBE has completed execution */
#define VDBE_MAGIC_DEAD 0xb606c3c8 /* The VDBE has been deallocated */
/*
** Here is a macro to handle the common case of popping the stack
** once. This macro only works from within the sqliteVdbeExec()
** function.
*/
#define POPSTACK \
assert(p->tos>=0); \
if( aStack[p->tos].flags & STK_Dyn ) sqliteFree(zStack[p->tos]); \
p->tos--;
/*
** Function prototypes
*/
void sqliteVdbeCleanupCursor(Cursor*);
void sqliteVdbeSorterReset(Vdbe*);
void sqliteVdbeAggReset(Agg*);
void sqliteVdbeKeylistFree(Keylist*);
void sqliteVdbePopStack(Vdbe*,int);
#if !defined(NDEBUG) || defined(VDBE_PROFILE)
void sqliteVdbePrintOp(FILE*, int, Op*);
#endif

996
src/vdbeaux.c Normal file
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@@ -0,0 +1,996 @@
/*
** 2003 September 6
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains code used for creating, destroying, and populating
** a VDBE (or an "sqlite_vm" as it is known to the outside world.) Prior
** to version 2.8.7, all this code was combined into the vdbe.c source file.
** But that file was getting too big so this subroutines were split out.
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include "vdbeInt.h"
/*
** When debugging the code generator in a symbolic debugger, one can
** set the sqlite_vdbe_addop_trace to 1 and all opcodes will be printed
** as they are added to the instruction stream.
*/
#ifndef NDEBUG
int sqlite_vdbe_addop_trace = 0;
#endif
/*
** Create a new virtual database engine.
*/
Vdbe *sqliteVdbeCreate(sqlite *db){
Vdbe *p;
p = sqliteMalloc( sizeof(Vdbe) );
if( p==0 ) return 0;
p->db = db;
if( db->pVdbe ){
db->pVdbe->pPrev = p;
}
p->pNext = db->pVdbe;
p->pPrev = 0;
db->pVdbe = p;
p->magic = VDBE_MAGIC_INIT;
return p;
}
/*
** Turn tracing on or off
*/
void sqliteVdbeTrace(Vdbe *p, FILE *trace){
p->trace = trace;
}
/*
** Add a new instruction to the list of instructions current in the
** VDBE. Return the address of the new instruction.
**
** Parameters:
**
** p Pointer to the VDBE
**
** op The opcode for this instruction
**
** p1, p2 First two of the three possible operands.
**
** Use the sqliteVdbeResolveLabel() function to fix an address and
** the sqliteVdbeChangeP3() function to change the value of the P3
** operand.
*/
int sqliteVdbeAddOp(Vdbe *p, int op, int p1, int p2){
int i;
i = p->nOp;
p->nOp++;
assert( p->magic==VDBE_MAGIC_INIT );
if( i>=p->nOpAlloc ){
int oldSize = p->nOpAlloc;
Op *aNew;
p->nOpAlloc = p->nOpAlloc*2 + 100;
aNew = sqliteRealloc(p->aOp, p->nOpAlloc*sizeof(Op));
if( aNew==0 ){
p->nOpAlloc = oldSize;
return 0;
}
p->aOp = aNew;
memset(&p->aOp[oldSize], 0, (p->nOpAlloc-oldSize)*sizeof(Op));
}
p->aOp[i].opcode = op;
p->aOp[i].p1 = p1;
if( p2<0 && (-1-p2)<p->nLabel && p->aLabel[-1-p2]>=0 ){
p2 = p->aLabel[-1-p2];
}
p->aOp[i].p2 = p2;
p->aOp[i].p3 = 0;
p->aOp[i].p3type = P3_NOTUSED;
#ifndef NDEBUG
if( sqlite_vdbe_addop_trace ) sqliteVdbePrintOp(0, i, &p->aOp[i]);
#endif
return i;
}
/*
** Create a new symbolic label for an instruction that has yet to be
** coded. The symbolic label is really just a negative number. The
** label can be used as the P2 value of an operation. Later, when
** the label is resolved to a specific address, the VDBE will scan
** through its operation list and change all values of P2 which match
** the label into the resolved address.
**
** The VDBE knows that a P2 value is a label because labels are
** always negative and P2 values are suppose to be non-negative.
** Hence, a negative P2 value is a label that has yet to be resolved.
*/
int sqliteVdbeMakeLabel(Vdbe *p){
int i;
i = p->nLabel++;
assert( p->magic==VDBE_MAGIC_INIT );
if( i>=p->nLabelAlloc ){
int *aNew;
p->nLabelAlloc = p->nLabelAlloc*2 + 10;
aNew = sqliteRealloc( p->aLabel, p->nLabelAlloc*sizeof(p->aLabel[0]));
if( aNew==0 ){
sqliteFree(p->aLabel);
}
p->aLabel = aNew;
}
if( p->aLabel==0 ){
p->nLabel = 0;
p->nLabelAlloc = 0;
return 0;
}
p->aLabel[i] = -1;
return -1-i;
}
/*
** Resolve label "x" to be the address of the next instruction to
** be inserted. The parameter "x" must have been obtained from
** a prior call to sqliteVdbeMakeLabel().
*/
void sqliteVdbeResolveLabel(Vdbe *p, int x){
int j;
assert( p->magic==VDBE_MAGIC_INIT );
if( x<0 && (-x)<=p->nLabel && p->aOp ){
if( p->aLabel[-1-x]==p->nOp ) return;
assert( p->aLabel[-1-x]<0 );
p->aLabel[-1-x] = p->nOp;
for(j=0; j<p->nOp; j++){
if( p->aOp[j].p2==x ) p->aOp[j].p2 = p->nOp;
}
}
}
/*
** Return the address of the next instruction to be inserted.
*/
int sqliteVdbeCurrentAddr(Vdbe *p){
assert( p->magic==VDBE_MAGIC_INIT );
return p->nOp;
}
/*
** Add a whole list of operations to the operation stack. Return the
** address of the first operation added.
*/
int sqliteVdbeAddOpList(Vdbe *p, int nOp, VdbeOp const *aOp){
int addr;
assert( p->magic==VDBE_MAGIC_INIT );
if( p->nOp + nOp >= p->nOpAlloc ){
int oldSize = p->nOpAlloc;
Op *aNew;
p->nOpAlloc = p->nOpAlloc*2 + nOp + 10;
aNew = sqliteRealloc(p->aOp, p->nOpAlloc*sizeof(Op));
if( aNew==0 ){
p->nOpAlloc = oldSize;
return 0;
}
p->aOp = aNew;
memset(&p->aOp[oldSize], 0, (p->nOpAlloc-oldSize)*sizeof(Op));
}
addr = p->nOp;
if( nOp>0 ){
int i;
for(i=0; i<nOp; i++){
int p2 = aOp[i].p2;
p->aOp[i+addr] = aOp[i];
if( p2<0 ) p->aOp[i+addr].p2 = addr + ADDR(p2);
p->aOp[i+addr].p3type = aOp[i].p3 ? P3_STATIC : P3_NOTUSED;
#ifndef NDEBUG
if( sqlite_vdbe_addop_trace ){
sqliteVdbePrintOp(0, i+addr, &p->aOp[i+addr]);
}
#endif
}
p->nOp += nOp;
}
return addr;
}
/*
** Change the value of the P1 operand for a specific instruction.
** This routine is useful when a large program is loaded from a
** static array using sqliteVdbeAddOpList but we want to make a
** few minor changes to the program.
*/
void sqliteVdbeChangeP1(Vdbe *p, int addr, int val){
assert( p->magic==VDBE_MAGIC_INIT );
if( p && addr>=0 && p->nOp>addr && p->aOp ){
p->aOp[addr].p1 = val;
}
}
/*
** Change the value of the P2 operand for a specific instruction.
** This routine is useful for setting a jump destination.
*/
void sqliteVdbeChangeP2(Vdbe *p, int addr, int val){
assert( val>=0 );
assert( p->magic==VDBE_MAGIC_INIT );
if( p && addr>=0 && p->nOp>addr && p->aOp ){
p->aOp[addr].p2 = val;
}
}
/*
** Change the value of the P3 operand for a specific instruction.
** This routine is useful when a large program is loaded from a
** static array using sqliteVdbeAddOpList but we want to make a
** few minor changes to the program.
**
** If n>=0 then the P3 operand is dynamic, meaning that a copy of
** the string is made into memory obtained from sqliteMalloc().
** A value of n==0 means copy bytes of zP3 up to and including the
** first null byte. If n>0 then copy n+1 bytes of zP3.
**
** If n==P3_STATIC it means that zP3 is a pointer to a constant static
** string and we can just copy the pointer. n==P3_POINTER means zP3 is
** a pointer to some object other than a string.
**
** If addr<0 then change P3 on the most recently inserted instruction.
*/
void sqliteVdbeChangeP3(Vdbe *p, int addr, const char *zP3, int n){
Op *pOp;
assert( p->magic==VDBE_MAGIC_INIT );
if( p==0 || p->aOp==0 ) return;
if( addr<0 || addr>=p->nOp ){
addr = p->nOp - 1;
if( addr<0 ) return;
}
pOp = &p->aOp[addr];
if( pOp->p3 && pOp->p3type==P3_DYNAMIC ){
sqliteFree(pOp->p3);
pOp->p3 = 0;
}
if( zP3==0 ){
pOp->p3 = 0;
pOp->p3type = P3_NOTUSED;
}else if( n<0 ){
pOp->p3 = (char*)zP3;
pOp->p3type = n;
}else{
sqliteSetNString(&pOp->p3, zP3, n, 0);
pOp->p3type = P3_DYNAMIC;
}
}
/*
** If the P3 operand to the specified instruction appears
** to be a quoted string token, then this procedure removes
** the quotes.
**
** The quoting operator can be either a grave ascent (ASCII 0x27)
** or a double quote character (ASCII 0x22). Two quotes in a row
** resolve to be a single actual quote character within the string.
*/
void sqliteVdbeDequoteP3(Vdbe *p, int addr){
Op *pOp;
assert( p->magic==VDBE_MAGIC_INIT );
if( p->aOp==0 || addr<0 || addr>=p->nOp ) return;
pOp = &p->aOp[addr];
if( pOp->p3==0 || pOp->p3[0]==0 ) return;
if( pOp->p3type==P3_POINTER ) return;
if( pOp->p3type!=P3_DYNAMIC ){
pOp->p3 = sqliteStrDup(pOp->p3);
pOp->p3type = P3_DYNAMIC;
}
sqliteDequote(pOp->p3);
}
/*
** On the P3 argument of the given instruction, change all
** strings of whitespace characters into a single space and
** delete leading and trailing whitespace.
*/
void sqliteVdbeCompressSpace(Vdbe *p, int addr){
unsigned char *z;
int i, j;
Op *pOp;
assert( p->magic==VDBE_MAGIC_INIT );
if( p->aOp==0 || addr<0 || addr>=p->nOp ) return;
pOp = &p->aOp[addr];
if( pOp->p3type==P3_POINTER ){
return;
}
if( pOp->p3type!=P3_DYNAMIC ){
pOp->p3 = sqliteStrDup(pOp->p3);
pOp->p3type = P3_DYNAMIC;
}
z = (unsigned char*)pOp->p3;
if( z==0 ) return;
i = j = 0;
while( isspace(z[i]) ){ i++; }
while( z[i] ){
if( isspace(z[i]) ){
z[j++] = ' ';
while( isspace(z[++i]) ){}
}else{
z[j++] = z[i++];
}
}
while( j>0 && isspace(z[j-1]) ){ j--; }
z[j] = 0;
}
/*
** Search for the current program for the given opcode and P2
** value. Return the address plus 1 if found and 0 if not found.
*/
int sqliteVdbeFindOp(Vdbe *p, int op, int p2){
int i;
assert( p->magic==VDBE_MAGIC_INIT );
for(i=0; i<p->nOp; i++){
if( p->aOp[i].opcode==op && p->aOp[i].p2==p2 ) return i+1;
}
return 0;
}
/*
** Return the opcode for a given address.
*/
VdbeOp *sqliteVdbeGetOp(Vdbe *p, int addr){
assert( p->magic==VDBE_MAGIC_INIT );
assert( addr>=0 && addr<p->nOp );
return &p->aOp[addr];
}
/*
** The following group or routines are employed by installable functions
** to return their results.
**
** The sqlite_set_result_string() routine can be used to return a string
** value or to return a NULL. To return a NULL, pass in NULL for zResult.
** A copy is made of the string before this routine returns so it is safe
** to pass in an ephemeral string.
**
** sqlite_set_result_error() works like sqlite_set_result_string() except
** that it signals a fatal error. The string argument, if any, is the
** error message. If the argument is NULL a generic substitute error message
** is used.
**
** The sqlite_set_result_int() and sqlite_set_result_double() set the return
** value of the user function to an integer or a double.
**
** These routines are defined here in vdbe.c because they depend on knowing
** the internals of the sqlite_func structure which is only defined in
** this source file.
*/
char *sqlite_set_result_string(sqlite_func *p, const char *zResult, int n){
assert( !p->isStep );
if( p->s.flags & STK_Dyn ){
sqliteFree(p->z);
}
if( zResult==0 ){
p->s.flags = STK_Null;
n = 0;
p->z = 0;
p->s.n = 0;
}else{
if( n<0 ) n = strlen(zResult);
if( n<NBFS-1 ){
memcpy(p->s.z, zResult, n);
p->s.z[n] = 0;
p->s.flags = STK_Str;
p->z = p->s.z;
}else{
p->z = sqliteMallocRaw( n+1 );
if( p->z ){
memcpy(p->z, zResult, n);
p->z[n] = 0;
}
p->s.flags = STK_Str | STK_Dyn;
}
p->s.n = n+1;
}
return p->z;
}
void sqlite_set_result_int(sqlite_func *p, int iResult){
assert( !p->isStep );
if( p->s.flags & STK_Dyn ){
sqliteFree(p->z);
}
p->s.i = iResult;
p->s.flags = STK_Int;
}
void sqlite_set_result_double(sqlite_func *p, double rResult){
assert( !p->isStep );
if( p->s.flags & STK_Dyn ){
sqliteFree(p->z);
}
p->s.r = rResult;
p->s.flags = STK_Real;
}
void sqlite_set_result_error(sqlite_func *p, const char *zMsg, int n){
assert( !p->isStep );
sqlite_set_result_string(p, zMsg, n);
p->isError = 1;
}
/*
** Extract the user data from a sqlite_func structure and return a
** pointer to it.
**
** This routine is defined here in vdbe.c because it depends on knowing
** the internals of the sqlite_func structure which is only defined in
** this source file.
*/
void *sqlite_user_data(sqlite_func *p){
assert( p && p->pFunc );
return p->pFunc->pUserData;
}
/*
** Allocate or return the aggregate context for a user function. A new
** context is allocated on the first call. Subsequent calls return the
** same context that was returned on prior calls.
**
** This routine is defined here in vdbe.c because it depends on knowing
** the internals of the sqlite_func structure which is only defined in
** this source file.
*/
void *sqlite_aggregate_context(sqlite_func *p, int nByte){
assert( p && p->pFunc && p->pFunc->xStep );
if( p->pAgg==0 ){
if( nByte<=NBFS ){
p->pAgg = (void*)p->z;
}else{
p->pAgg = sqliteMalloc( nByte );
}
}
return p->pAgg;
}
/*
** Return the number of times the Step function of a aggregate has been
** called.
**
** This routine is defined here in vdbe.c because it depends on knowing
** the internals of the sqlite_func structure which is only defined in
** this source file.
*/
int sqlite_aggregate_count(sqlite_func *p){
assert( p && p->pFunc && p->pFunc->xStep );
return p->cnt;
}
#if !defined(NDEBUG) || defined(VDBE_PROFILE)
/*
** Print a single opcode. This routine is used for debugging only.
*/
void sqliteVdbePrintOp(FILE *pOut, int pc, Op *pOp){
char *zP3;
char zPtr[40];
if( pOp->p3type==P3_POINTER ){
sprintf(zPtr, "ptr(%#x)", (int)pOp->p3);
zP3 = zPtr;
}else{
zP3 = pOp->p3;
}
if( pOut==0 ) pOut = stdout;
fprintf(pOut,"%4d %-12s %4d %4d %s\n",
pc, sqliteOpcodeNames[pOp->opcode], pOp->p1, pOp->p2, zP3 ? zP3 : "");
fflush(pOut);
}
#endif
/*
** Give a listing of the program in the virtual machine.
**
** The interface is the same as sqliteVdbeExec(). But instead of
** running the code, it invokes the callback once for each instruction.
** This feature is used to implement "EXPLAIN".
*/
int sqliteVdbeList(
Vdbe *p /* The VDBE */
){
sqlite *db = p->db;
int i;
static char *azColumnNames[] = {
"addr", "opcode", "p1", "p2", "p3",
"int", "text", "int", "int", "text",
0
};
assert( p->popStack==0 );
assert( p->explain );
p->azColName = azColumnNames;
p->azResColumn = p->zStack;
for(i=0; i<5; i++) p->zStack[i] = p->aStack[i].z;
p->rc = SQLITE_OK;
for(i=p->pc; p->rc==SQLITE_OK && i<p->nOp; i++){
if( db->flags & SQLITE_Interrupt ){
db->flags &= ~SQLITE_Interrupt;
if( db->magic!=SQLITE_MAGIC_BUSY ){
p->rc = SQLITE_MISUSE;
}else{
p->rc = SQLITE_INTERRUPT;
}
sqliteSetString(&p->zErrMsg, sqlite_error_string(p->rc), 0);
break;
}
sprintf(p->zStack[0],"%d",i);
sprintf(p->zStack[2],"%d", p->aOp[i].p1);
sprintf(p->zStack[3],"%d", p->aOp[i].p2);
if( p->aOp[i].p3type==P3_POINTER ){
sprintf(p->aStack[4].z, "ptr(%#x)", (int)p->aOp[i].p3);
p->zStack[4] = p->aStack[4].z;
}else{
p->zStack[4] = p->aOp[i].p3;
}
p->zStack[1] = sqliteOpcodeNames[p->aOp[i].opcode];
if( p->xCallback==0 ){
p->pc = i+1;
p->azResColumn = p->zStack;
p->nResColumn = 5;
return SQLITE_ROW;
}
if( sqliteSafetyOff(db) ){
p->rc = SQLITE_MISUSE;
break;
}
if( p->xCallback(p->pCbArg, 5, p->zStack, p->azColName) ){
p->rc = SQLITE_ABORT;
}
if( sqliteSafetyOn(db) ){
p->rc = SQLITE_MISUSE;
}
}
return p->rc==SQLITE_OK ? SQLITE_DONE : SQLITE_ERROR;
}
/*
** Prepare a virtual machine for execution. This involves things such
** as allocating stack space and initializing the program counter.
** After the VDBE has be prepped, it can be executed by one or more
** calls to sqliteVdbeExec().
**
** The behavior of sqliteVdbeExec() is influenced by the parameters to
** this routine. If xCallback is NULL, then sqliteVdbeExec() will return
** with SQLITE_ROW whenever there is a row of the result set ready
** to be delivered. p->azResColumn will point to the row and
** p->nResColumn gives the number of columns in the row. If xCallback
** is not NULL, then the xCallback() routine is invoked to process each
** row in the result set.
*/
void sqliteVdbeMakeReady(
Vdbe *p, /* The VDBE */
sqlite_callback xCallback, /* Result callback */
void *pCallbackArg, /* 1st argument to xCallback() */
int isExplain /* True if the EXPLAIN keywords is present */
){
int n;
assert( p!=0 );
assert( p->aStack==0 );
assert( p->magic==VDBE_MAGIC_INIT );
/* Add a HALT instruction to the very end of the program.
*/
if( p->nOp==0 || (p->aOp && p->aOp[p->nOp-1].opcode!=OP_Halt) ){
sqliteVdbeAddOp(p, OP_Halt, 0, 0);
}
/* No instruction ever pushes more than a single element onto the
** stack. And the stack never grows on successive executions of the
** same loop. So the total number of instructions is an upper bound
** on the maximum stack depth required.
**
** Allocation all the stack space we will ever need.
*/
n = isExplain ? 10 : p->nOp;
p->aStack = sqliteMalloc( n*(sizeof(p->aStack[0]) + 2*sizeof(char*)) );
p->zStack = (char**)&p->aStack[n];
p->azColName = (char**)&p->zStack[n];
sqliteHashInit(&p->agg.hash, SQLITE_HASH_BINARY, 0);
p->agg.pSearch = 0;
#ifdef MEMORY_DEBUG
if( sqliteOsFileExists("vdbe_trace") ){
p->trace = stdout;
}
#endif
p->tos = -1;
p->pc = 0;
p->rc = SQLITE_OK;
p->uniqueCnt = 0;
p->returnDepth = 0;
p->errorAction = OE_Abort;
p->undoTransOnError = 0;
p->xCallback = xCallback;
p->pCbArg = pCallbackArg;
p->popStack = 0;
p->explain |= isExplain;
p->magic = VDBE_MAGIC_RUN;
#ifdef VDBE_PROFILE
for(i=0; i<p->nOp; i++){
p->aOp[i].cnt = 0;
p->aOp[i].cycles = 0;
}
#endif
}
/*
** Remove any elements that remain on the sorter for the VDBE given.
*/
void sqliteVdbeSorterReset(Vdbe *p){
while( p->pSort ){
Sorter *pSorter = p->pSort;
p->pSort = pSorter->pNext;
sqliteFree(pSorter->zKey);
sqliteFree(pSorter->pData);
sqliteFree(pSorter);
}
}
/*
** Pop the stack N times. Free any memory associated with the
** popped stack elements.
*/
void sqliteVdbePopStack(Vdbe *p, int N){
assert( N>=0 );
if( p->zStack==0 ) return;
assert( p->aStack || sqlite_malloc_failed );
if( p->aStack==0 ) return;
while( N-- > 0 ){
if( p->aStack[p->tos].flags & STK_Dyn ){
sqliteFree(p->zStack[p->tos]);
}
p->aStack[p->tos].flags = 0;
p->zStack[p->tos] = 0;
p->tos--;
}
}
/*
** Reset an Agg structure. Delete all its contents.
**
** For installable aggregate functions, if the step function has been
** called, make sure the finalizer function has also been called. The
** finalizer might need to free memory that was allocated as part of its
** private context. If the finalizer has not been called yet, call it
** now.
*/
void sqliteVdbeAggReset(Agg *pAgg){
int i;
HashElem *p;
for(p = sqliteHashFirst(&pAgg->hash); p; p = sqliteHashNext(p)){
AggElem *pElem = sqliteHashData(p);
assert( pAgg->apFunc!=0 );
for(i=0; i<pAgg->nMem; i++){
Mem *pMem = &pElem->aMem[i];
if( pAgg->apFunc[i] && (pMem->s.flags & STK_AggCtx)!=0 ){
sqlite_func ctx;
ctx.pFunc = pAgg->apFunc[i];
ctx.s.flags = STK_Null;
ctx.z = 0;
ctx.pAgg = pMem->z;
ctx.cnt = pMem->s.i;
ctx.isStep = 0;
ctx.isError = 0;
(*pAgg->apFunc[i]->xFinalize)(&ctx);
if( pMem->z!=0 && pMem->z!=pMem->s.z ){
sqliteFree(pMem->z);
}
}else if( pMem->s.flags & STK_Dyn ){
sqliteFree(pMem->z);
}
}
sqliteFree(pElem);
}
sqliteHashClear(&pAgg->hash);
sqliteFree(pAgg->apFunc);
pAgg->apFunc = 0;
pAgg->pCurrent = 0;
pAgg->pSearch = 0;
pAgg->nMem = 0;
}
/*
** Delete a keylist
*/
void sqliteVdbeKeylistFree(Keylist *p){
while( p ){
Keylist *pNext = p->pNext;
sqliteFree(p);
p = pNext;
}
}
/*
** Close a cursor and release all the resources that cursor happens
** to hold.
*/
void sqliteVdbeCleanupCursor(Cursor *pCx){
if( pCx->pCursor ){
sqliteBtreeCloseCursor(pCx->pCursor);
}
if( pCx->pBt ){
sqliteBtreeClose(pCx->pBt);
}
sqliteFree(pCx->pData);
memset(pCx, 0, sizeof(Cursor));
}
/*
** Close all cursors
*/
static void closeAllCursors(Vdbe *p){
int i;
for(i=0; i<p->nCursor; i++){
sqliteVdbeCleanupCursor(&p->aCsr[i]);
}
sqliteFree(p->aCsr);
p->aCsr = 0;
p->nCursor = 0;
}
/*
** Delete the variables in p->azVariable[]
*/
static void ClearVariableArray(Vdbe *p){
sqliteFree(p->azVariable);
p->nVariable = 0;
p->azVariable = 0;
}
/*
** Clean up the VM after execution.
**
** This routine will automatically close any cursors, lists, and/or
** sorters that were left open. It also deletes the values of
** variables in the azVariable[] array.
*/
static void Cleanup(Vdbe *p){
int i;
sqliteVdbePopStack(p, p->tos+1);
closeAllCursors(p);
if( p->aMem ){
for(i=0; i<p->nMem; i++){
if( p->aMem[i].s.flags & STK_Dyn ){
sqliteFree(p->aMem[i].z);
}
}
}
sqliteFree(p->aMem);
p->aMem = 0;
p->nMem = 0;
if( p->pList ){
sqliteVdbeKeylistFree(p->pList);
p->pList = 0;
}
sqliteVdbeSorterReset(p);
if( p->pFile ){
if( p->pFile!=stdin ) fclose(p->pFile);
p->pFile = 0;
}
if( p->azField ){
sqliteFree(p->azField);
p->azField = 0;
}
p->nField = 0;
if( p->zLine ){
sqliteFree(p->zLine);
p->zLine = 0;
}
p->nLineAlloc = 0;
sqliteVdbeAggReset(&p->agg);
if( p->aSet ){
for(i=0; i<p->nSet; i++){
sqliteHashClear(&p->aSet[i].hash);
}
}
sqliteFree(p->aSet);
p->aSet = 0;
p->nSet = 0;
if( p->keylistStack ){
int ii;
for(ii = 0; ii < p->keylistStackDepth; ii++){
sqliteVdbeKeylistFree(p->keylistStack[ii]);
}
sqliteFree(p->keylistStack);
p->keylistStackDepth = 0;
p->keylistStack = 0;
}
sqliteFree(p->zErrMsg);
p->zErrMsg = 0;
ClearVariableArray(p);
}
/*
** Clean up a VDBE after execution but do not delete the VDBE just yet.
** Write any error messages into *pzErrMsg. Return the result code.
**
** After this routine is run, the VDBE should be ready to be executed
** again.
*/
int sqliteVdbeReset(Vdbe *p, char **pzErrMsg){
sqlite *db = p->db;
int i;
if( p->magic!=VDBE_MAGIC_RUN && p->magic!=VDBE_MAGIC_HALT ){
sqliteSetString(pzErrMsg, sqlite_error_string(SQLITE_MISUSE), 0);
return SQLITE_MISUSE;
}
if( p->zErrMsg ){
if( pzErrMsg && *pzErrMsg==0 ){
*pzErrMsg = p->zErrMsg;
}else{
sqliteFree(p->zErrMsg);
}
p->zErrMsg = 0;
}
Cleanup(p);
if( p->rc!=SQLITE_OK ){
switch( p->errorAction ){
case OE_Abort: {
if( !p->undoTransOnError ){
for(i=0; i<db->nDb; i++){
if( db->aDb[i].pBt ){
sqliteBtreeRollbackCkpt(db->aDb[i].pBt);
}
}
break;
}
/* Fall through to ROLLBACK */
}
case OE_Rollback: {
sqliteRollbackAll(db);
db->flags &= ~SQLITE_InTrans;
db->onError = OE_Default;
break;
}
default: {
if( p->undoTransOnError ){
sqliteRollbackAll(db);
db->flags &= ~SQLITE_InTrans;
db->onError = OE_Default;
}
break;
}
}
sqliteRollbackInternalChanges(db);
}
for(i=0; i<db->nDb; i++){
if( db->aDb[i].pBt && db->aDb[i].inTrans==2 ){
sqliteBtreeCommitCkpt(db->aDb[i].pBt);
db->aDb[i].inTrans = 1;
}
}
assert( p->tos<p->pc || sqlite_malloc_failed==1 );
#ifdef VDBE_PROFILE
{
FILE *out = fopen("vdbe_profile.out", "a");
if( out ){
int i;
fprintf(out, "---- ");
for(i=0; i<p->nOp; i++){
fprintf(out, "%02x", p->aOp[i].opcode);
}
fprintf(out, "\n");
for(i=0; i<p->nOp; i++){
fprintf(out, "%6d %10lld %8lld ",
p->aOp[i].cnt,
p->aOp[i].cycles,
p->aOp[i].cnt>0 ? p->aOp[i].cycles/p->aOp[i].cnt : 0
);
sqliteVdbePrintOp(out, i, &p->aOp[i]);
}
fclose(out);
}
}
#endif
p->magic = VDBE_MAGIC_INIT;
return p->rc;
}
/*
** Clean up and delete a VDBE after execution. Return an integer which is
** the result code. Write any error message text into *pzErrMsg.
*/
int sqliteVdbeFinalize(Vdbe *p, char **pzErrMsg){
int rc;
sqlite *db;
if( p->magic!=VDBE_MAGIC_RUN && p->magic!=VDBE_MAGIC_HALT ){
sqliteSetString(pzErrMsg, sqlite_error_string(SQLITE_MISUSE), 0);
return SQLITE_MISUSE;
}
db = p->db;
rc = sqliteVdbeReset(p, pzErrMsg);
sqliteVdbeDelete(p);
if( db->want_to_close && db->pVdbe==0 ){
sqlite_close(db);
}
return rc;
}
/*
** Set the values of all variables. Variable $1 in the original SQL will
** be the string azValue[0]. $2 will have the value azValue[1]. And
** so forth. If a value is out of range (for example $3 when nValue==2)
** then its value will be NULL.
**
** This routine overrides any prior call.
*/
int sqliteVdbeSetVariables(Vdbe *p, int nValue, const char **azValue){
int i, n;
char *z;
if( p->magic!=VDBE_MAGIC_RUN || p->pc!=0 || p->nVariable!=0 ){
return SQLITE_MISUSE;
}
ClearVariableArray(p);
if( nValue==0 ){
p->nVariable = 0;
p->azVariable = 0;
}
for(i=n=0; i<nValue; i++){
if( azValue[i] ) n += strlen(azValue[i]) + 1;
}
p->azVariable = sqliteMalloc( sizeof(p->azVariable[0])*nValue + n );
if( p->azVariable==0 ){
p->nVariable = 0;
return SQLITE_NOMEM;
}
z = (char*)&p->azVariable[nValue];
for(i=0; i<nValue; i++){
if( azValue[i]==0 ){
p->azVariable[i] = 0;
}else{
p->azVariable[i] = z;
n = strlen(azValue[i]);
memcpy(z, azValue[i], n+1);
z += n+1;
}
}
p->nVariable = nValue;
return SQLITE_OK;
}
/*
** Delete an entire VDBE.
*/
void sqliteVdbeDelete(Vdbe *p){
int i;
if( p==0 ) return;
Cleanup(p);
if( p->pPrev ){
p->pPrev->pNext = p->pNext;
}else{
assert( p->db->pVdbe==p );
p->db->pVdbe = p->pNext;
}
if( p->pNext ){
p->pNext->pPrev = p->pPrev;
}
p->pPrev = p->pNext = 0;
if( p->nOpAlloc==0 ){
p->aOp = 0;
p->nOp = 0;
}
for(i=0; i<p->nOp; i++){
if( p->aOp[i].p3type==P3_DYNAMIC ){
sqliteFree(p->aOp[i].p3);
}
}
sqliteFree(p->aOp);
sqliteFree(p->aLabel);
sqliteFree(p->aStack);
p->magic = VDBE_MAGIC_DEAD;
sqliteFree(p);
}