[Zend] Update README.md with new Zend VM executors #8008
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As a new learner to PHP Zend VM, the first place I can find information is this README.md. Unfortunately, it has not included the latest Zend VM kind and code generation script. With code reading and trail-and-error experiments, I found a few updates that might be helpful to new learners. ChangeLog: 1) Add HYBRID threading model 2) Remove --without-old-executor option and description 3) ZE2 --> ZE3 (Since PHP 7) 4) Change default VM kind from CALL to HYBRID Signed-off-by: Su, Tao <[email protected]>
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This is the change result preview |
Reviewed-by: Ilija Tovilo
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@iluuu1994 Thanks for the review and comments which are all applied in the 2nd commit. |
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Thanks @stkeke! |
| You can disable opcode specialization using `--without-specializer`. | ||
| At last you can debug the executor using the original `zend_vm_def.h` or the generated | ||
| `zend_vm_execute.h` file. Debugging with the original file requires the `--with-lines` option. | ||
| By default ZE3 (since PHP 7) uses the following command to generate executor: |
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As of PHP 8.0.0, it is ZE4. Might be better to omit the version, and just say "Zend Engine".
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@cmb69 I can make a new patch to update README.md as your comment.
However, in the zend.h, I found another macro #define ZEND_ENGINE_3 defined immediately following ZEND_VERSION "4.2.0-dev", should we also update it to ZEND_ENGINE_4? (A rough search in source code shows no reference to this macro definition. )
Zend Engine 3 git commit upgraded both ZEND_VERSION and ZEND_ENGINE_3.
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New README update PR is here: #8057
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I don't think we can replace ZEND_ENGINE_3, because it is likely used by some extensions. Updating to ZEND_ENGINE_4 makes sense for PHP 9, if there are sufficient API changes (PHP 7 and PHP 8 didn't differ that much regarding ZE).
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got it. Thanks @cmb69 for the clarification.
As a new learner to PHP Zend VM, the first place I can find information
is this README.md. Unfortunately, it has not included the latest Zend VM
kind and code generation script.
With code reading and trail-and-error experiments, I found a few updates
that might be helpful to new learners.
ChangeLog:
Signed-off-by: Su, Tao [email protected]