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2d76be251d
This updates `dtoa.c` to avoid using the Bigint free-list in --disable-gil builds and to pre-computes the needed powers of 5 during interpreter initialization. * gh-111962: Make dtoa thread-safe in `--disable-gil` builds. This avoids using the Bigint free-list in `--disable-gil` builds and pre-computes the needed powers of 5 during interpreter initialization. * Fix size of cached powers of 5 array. We need the powers of 5 up to 5**512 because we only jump straight to underflow when the exponent is less than -512 (or larger than 308). * Rename Py_NOGIL to Py_GIL_DISABLED * Changes from review * Fix assertion placement
79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
#ifndef Py_INTERNAL_DTOA_H
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#define Py_INTERNAL_DTOA_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef Py_BUILD_CORE
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# error "this header requires Py_BUILD_CORE define"
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#endif
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#include "pycore_pymath.h" // _PY_SHORT_FLOAT_REPR
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#if _PY_SHORT_FLOAT_REPR == 1
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typedef uint32_t ULong;
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struct
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Bigint {
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struct Bigint *next;
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int k, maxwds, sign, wds;
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ULong x[1];
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};
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#ifdef Py_USING_MEMORY_DEBUGGER
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struct _dtoa_state {
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int _not_used;
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};
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#define _dtoa_interp_state_INIT(INTERP) \
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{0}
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#else // !Py_USING_MEMORY_DEBUGGER
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/* The size of the Bigint freelist */
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#define Bigint_Kmax 7
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/* The size of the cached powers of 5 array */
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#define Bigint_Pow5size 8
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#ifndef PRIVATE_MEM
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#define PRIVATE_MEM 2304
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#endif
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#define Bigint_PREALLOC_SIZE \
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((PRIVATE_MEM+sizeof(double)-1)/sizeof(double))
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struct _dtoa_state {
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// p5s is an array of powers of 5 of the form:
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// 5**(2**(i+2)) for 0 <= i < Bigint_Pow5size
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struct Bigint *p5s[Bigint_Pow5size];
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// XXX This should be freed during runtime fini.
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struct Bigint *freelist[Bigint_Kmax+1];
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double preallocated[Bigint_PREALLOC_SIZE];
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double *preallocated_next;
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};
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#define _dtoa_state_INIT(INTERP) \
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{ \
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.preallocated_next = (INTERP)->dtoa.preallocated, \
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}
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#endif // !Py_USING_MEMORY_DEBUGGER
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extern double _Py_dg_strtod(const char *str, char **ptr);
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extern char* _Py_dg_dtoa(double d, int mode, int ndigits,
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int *decpt, int *sign, char **rve);
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extern void _Py_dg_freedtoa(char *s);
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#endif // _PY_SHORT_FLOAT_REPR == 1
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extern PyStatus _PyDtoa_Init(PyInterpreterState *interp);
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extern void _PyDtoa_Fini(PyInterpreterState *interp);
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_INTERNAL_DTOA_H */
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