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catchable defects (#13626)

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* allow defects to be caught even for --exceptions:goto (WIP)
* implemented the new --panics:on|off switch; refs https://github.com/nim-lang/RFCs/issues/180
* new implementation for integer overflow checking
* produce a warning if a user-defined exception type inherits from Exception directly
* applied Timothee's suggestions; improved the documentation and replace the term 'checked runtime check' by 'panic'
* fixes #13627
* don't inherit from Exception directly
This commit is contained in:
Andreas Rumpf 2020-03-12 23:44:33 +01:00 • committed by GitHub
commit a6682de004
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35 changed files with 441 additions and 142 deletions
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22
lib/nimbase.h
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@ -545,4 +545,26 @@ typedef int Nim_and_C_compiler_disagree_on_target_architecture[sizeof(NI) == siz
#define NIM_CHECK_SIZE(typ, sz) \
_Static_assert(sizeof(typ) == sz, "Nim & C disagree on type size")
/* these exist to make the codegen logic simpler */
#define nimModInt(a, b, res) (((*res) = (a) % (b)), 0)
#define nimModInt64(a, b, res) (((*res) = (a) % (b)), 0)
/* these exist because we cannot have .compilerProcs that are importc'ed
by a different name */
#define nimAddInt64(a, b, res) __builtin_saddll_overflow(a, b, (long long int*)res)
#define nimSubInt64(a, b, res) __builtin_ssubll_overflow(a, b, (long long int*)res)
#define nimMulInt64(a, b, res) __builtin_smulll_overflow(a, b, (long long int*)res)
#if NIM_INTBITS == 32
#define nimAddInt(a, b, res) __builtin_sadd_overflow(a, b, res)
#define nimSubInt(a, b, res) __builtin_ssub_overflow(a, b, res)
#define nimMulInt(a, b, res) __builtin_smul_overflow(a, b, res)
#else
/* map it to the 'long long' variant */
#define nimAddInt(a, b, res) __builtin_saddll_overflow(a, b, (long long int*)res)
#define nimSubInt(a, b, res) __builtin_ssubll_overflow(a, b, (long long int*)res)
#define nimMulInt(a, b, res) __builtin_smulll_overflow(a, b, (long long int*)res)
#endif
#endif /* NIMBASE_H */