diff options
Diffstat (limited to 'Include/cpython/code.h')
| -rw-r--r-- | Include/cpython/code.h | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/Include/cpython/code.h b/Include/cpython/code.h index c81f9f3..a338374 100644 --- a/Include/cpython/code.h +++ b/Include/cpython/code.h @@ -2,9 +2,16 @@ # error "this header file must not be included directly" #endif +/* Each instruction in a code object is a fixed-width value, + * currently 2 bytes: 1-byte opcode + 1-byte oparg. The EXTENDED_ARG + * opcode allows for larger values but the current limit is 3 uses + * of EXTENDED_ARG (see Python/wordcode_helpers.h), for a maximum + * 32-bit value. This aligns with the note in Python/compile.c + * (compiler_addop_i_line) indicating that the max oparg value is + * 2**32 - 1, rather than INT_MAX. + */ + typedef uint16_t _Py_CODEUNIT; -// Each oparg must fit in the second half of _Py_CODEUNIT, hence 8 bits. -#define _Py_MAX_OPARG 255 #ifdef WORDS_BIGENDIAN # define _Py_OPCODE(word) ((word) >> 8) |