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Remove the rarely-used scratch memory allocator. This makes the code smaller,

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faster, and easier to maintain.  In place of the scratch allocator, add the
SQLITE_CONFIG_SMALL_MALLOC configuration option that provides a hint to SQLite
that large memory allocations should be avoided.

FossilOrigin-Name: 54b000246cfb5c7b8adb61a17357ef5a49adddde9e48e8937834d5ba0beb8a6b
This commit is contained in:
drh
2017-08-28 15:51:35 +00:00
parent b3c4523c58
commit b2a0f75c06
19 changed files with 71 additions and 517 deletions
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9
src/sqliteInt.h
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@@ -3268,6 +3268,7 @@ struct Sqlite3Config {
int bFullMutex; /* True to enable full mutexing */
int bOpenUri; /* True to interpret filenames as URIs */
int bUseCis; /* Use covering indices for full-scans */
int bSmallMalloc; /* Avoid large memory allocations if true */
int mxStrlen; /* Maximum string length */
int neverCorrupt; /* Database is always well-formed */
int szLookaside; /* Default lookaside buffer size */
@@ -3281,9 +3282,6 @@ struct Sqlite3Config {
int mnReq, mxReq; /* Min and max heap requests sizes */
sqlite3_int64 szMmap; /* mmap() space per open file */
sqlite3_int64 mxMmap; /* Maximum value for szMmap */
void *pScratch; /* Scratch memory */
int szScratch; /* Size of each scratch buffer */
int nScratch; /* Number of scratch buffers */
void *pPage; /* Page cache memory */
int szPage; /* Size of each page in pPage[] */
int nPage; /* Number of pages in pPage[] */
@@ -3522,8 +3520,6 @@ void sqlite3DbFree(sqlite3*, void*);
void sqlite3DbFreeNN(sqlite3*, void*);
int sqlite3MallocSize(void*);
int sqlite3DbMallocSize(sqlite3*, void*);
void *sqlite3ScratchMalloc(int);
void sqlite3ScratchFree(void*);
void *sqlite3PageMalloc(int);
void sqlite3PageFree(void*);
void sqlite3MemSetDefault(void);
@@ -4385,8 +4381,7 @@ SQLITE_API SQLITE_EXTERN void (SQLITE_CDECL *sqlite3IoTrace)(const char*,...);
#endif
#define MEMTYPE_HEAP 0x01 /* General heap allocations */
#define MEMTYPE_LOOKASIDE 0x02 /* Heap that might have been lookaside */
#define MEMTYPE_SCRATCH 0x04 /* Scratch allocations */
#define MEMTYPE_PCACHE 0x08 /* Page cache allocations */
#define MEMTYPE_PCACHE 0x04 /* Page cache allocations */
/*
** Threading interface