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Code changes that make it easier to prove that no 32-bit integer overflows

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happen during memory allocation.  No problems fixed; this change is just
to make future maintenance easier.

FossilOrigin-Name: 215650a5a1d55bdbca9c92524804a1a54456a17f42a17e53747b21a6507506f5
This commit is contained in:
drh
2025-02-17 17:33:14 +00:00
parent ad5dcff53b
commit ef86b942b9
21 changed files with 111 additions and 85 deletions
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8
src/sqliteInt.h
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@@ -1016,6 +1016,14 @@ typedef INT16_TYPE LogEst;
#define LARGEST_UINT64 (0xffffffff|(((u64)0xffffffff)<<32))
#define SMALLEST_INT64 (((i64)-1) - LARGEST_INT64)
/*
** Macro SMXV(n) return the maximum value that can be held in variable n,
** assuming n is a signed integer type. UMXV(n) is similar for unsigned
** integer types.
*/
#define SMXV(n) ((((i64)1)<<(sizeof(n)-1))-1)
#define UMXV(n) ((((i64)1)<<(sizeof(n)))-1)
/*
** Round up a number to the next larger multiple of 8. This is used
** to force 8-byte alignment on 64-bit architectures.