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-/*
-** 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.
-*/
-
-/*
-** When converting from the native format to the key format and back
-** again, in addition to changing the byte order we invert the high-order
-** bit of the most significant byte. This causes negative numbers to
-** sort before positive numbers in the memcmp() function.
-*/
-#define keyToInt(X) (sqliteVdbeByteSwap(X) ^ 0x80000000)
-#define intToKey(X) (sqliteVdbeByteSwap((X) ^ 0x80000000))
-
-/*
-** 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 */
- Bool deferredMoveto; /* A call to sqliteBtreeMoveto() is needed */
- int movetoTarget; /* Argument to the deferred sqliteBtreeMoveto() */
- 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 or a single memory cell
-** is an instance of the following structure.
-*/
-struct Mem {
- int i; /* Integer value */
- int n; /* Number of characters in string value, including '\0' */
- int flags; /* Some combination of MEM_Null, MEM_Str, MEM_Dyn, etc. */
- double r; /* Real value */
- char *z; /* String value */
- char zShort[NBFS]; /* Space for short strings */
-};
-typedef struct Mem Mem;
-
-/*
-** Allowed values for Mem.flags
-*/
-#define MEM_Null 0x0001 /* Value is NULL */
-#define MEM_Str 0x0002 /* Value is a string */
-#define MEM_Int 0x0004 /* Value is an integer */
-#define MEM_Real 0x0008 /* Value is a real number */
-#define MEM_Dyn 0x0010 /* Need to call sqliteFree() on Mem.z */
-#define MEM_Static 0x0020 /* Mem.z points to a static string */
-#define MEM_Ephem 0x0040 /* Mem.z points to an ephemeral string */
-#define MEM_Short 0x0080 /* Mem.z points to Mem.zShort */
-
-/* The following MEM_ 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 MEM_AggCtx 0x0100 /* Mem.z 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 STQLite, 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
-** (Mem) which are only defined there.
-*/
-struct sqlite_func {
- FuncDef *pFunc; /* Pointer to function information. MUST BE FIRST */
- Mem s; /* The return value is stored here */
- 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 Q_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 */
-};
-
-/*
-** A Context stores the last insert rowid, the last statement change count,
-** and the current statement change count (i.e. changes since last statement).
-** Elements of Context structure type make up the ContextStack, which is
-** updated by the ContextPush and ContextPop opcodes (used by triggers)
-*/
-typedef struct Context Context;
-struct Context {
- int lastRowid; /* Last insert rowid (from db->lastRowid) */
- int lsChange; /* Last statement change count (from db->lsChange) */
- int csChange; /* Current statement change count (from db->csChange) */
-};
-
-/*
-** 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 Q_SLOTS allocated for aOp[] */
- Op *aOp; /* Space to hold the virtual machine's program */
- int nLabel; /* Number of labels used */
- int nLabelAlloc; /* Number of Q_SLOTS allocated in aLabel[] */
- int *aLabel; /* Space to hold the labels */
- Mem *aStack; /* The operand stack, except string values */
- Mem *pTos; /* Top entry in the operand stack */
- char **zArgv; /* Text values used by the callback */
- char **azColName; /* Becomes the 4th parameter to callbacks */
- int nCursor; /* Number of Q_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 nVar; /* Number of entries in azVariable[] */
- char **azVar; /* Values for the OP_Variable opcode */
- int *anVar; /* Length of each value in azVariable[] */
- u8 *abVar; /* TRUE if azVariable[i] needs to be sqliteFree()ed */
- 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 contextStackDepth; /* The size of the "context" stack */
- Context *contextStack; /* Stack used by opcodes ContextPush & ContextPop*/
- 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 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 */
-
-/*
-** Function prototypes
-*/
-void sqliteVdbeCleanupCursor(Cursor*);
-void sqliteVdbeSorterReset(Vdbe*);
-void sqliteVdbeAggReset(Agg*);
-void sqliteVdbeKeylistFree(Keylist*);
-void sqliteVdbePopStack(Vdbe*,int);
-int sqliteVdbeCursorMoveto(Cursor*);
-int sqliteVdbeByteSwap(int);
-#if !defined(NDEBUG) || defined(VDBE_PROFILE)
-void sqliteVdbePrintOp(FILE*, int, Op*);
-#endif