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patch 8.0.0219: ubsan reports errors for overflow

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Problem:    Ubsan reports errors for integer overflow.
Solution:   Define macros for minimum and maximum values.  Select an
            expression based on the value. (Mike Williams)
This commit is contained in:
Bram Moolenaar
2017-01-22 18:34:57 +01:00
parent 2b2207ba69
commit 7a40ea2138
6 changed files with 59 additions and 31 deletions
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18
src/structs.h
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@@ -1133,25 +1133,43 @@ typedef long_u hash_T; /* Type for hi_hash */
# ifdef PROTO
typedef long varnumber_T;
typedef unsigned long uvarnumber_T;
#define VARNUM_MIN LONG_MIN
#define VARNUM_MAX LONG_MAX
#define UVARNUM_MAX ULONG_MAX
# else
typedef __int64 varnumber_T;
typedef unsigned __int64 uvarnumber_T;
#define VARNUM_MIN _I64_MIN
#define VARNUM_MAX _I64_MAX
#define UVARNUM_MAX _UI64_MAX
# endif
# elif defined(HAVE_STDINT_H)
typedef int64_t varnumber_T;
typedef uint64_t uvarnumber_T;
#define VARNUM_MIN INT64_MIN
#define VARNUM_MAX INT64_MAX
#define UVARNUM_MAX UINT64_MAX
# else
typedef long varnumber_T;
typedef unsigned long uvarnumber_T;
#define VARNUM_MIN LONG_MIN
#define VARNUM_MAX LONG_MAX
#define UVARNUM_MAX ULONG_MAX
# endif
#else
/* Use 32-bit Number. */
# if VIM_SIZEOF_INT <= 3 /* use long if int is smaller than 32 bits */
typedef long varnumber_T;
typedef unsigned long uvarnumber_T;
#define VARNUM_MIN LONG_MIN
#define VARNUM_MAX LONG_MAX
#define UVARNUM_MAX ULONG_MAX
# else
typedef int varnumber_T;
typedef unsigned int uvarnumber_T;
#define VARNUM_MIN INT_MIN
#define VARNUM_MAX INT_MAX
#define UVARNUM_MAX UINT_MAX
# endif
#endif