[Python-Dev] Opcode cache in ceval loop (original) (raw)
Yury Selivanov yselivanov.ml at gmail.com
Mon Feb 1 17:22:46 EST 2016
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On 2016-02-01 4:21 PM, Yury Selivanov wrote:
Hi Damien,
On 2016-02-01 3:59 PM, Damien George wrote: [..]
But then how do you index the cache, do you keep a count of the current opcode number? If I remember correctly, CPython has some opcodes taking 1 byte, and some taking 3 bytes, so the offset into the bytecode cannot be easily mapped to a bytecode number.
Here are a few links that might explain the idea better:
https://github.com/1st1/cpython/blob/opcache5/Python/ceval.c#L1229 https://github.com/1st1/cpython/blob/opcache5/Python/ceval.c#L2610 https://github.com/1st1/cpython/blob/opcache5/Objects/codeobject.c#L167
Yury
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