Tier 2 trace projection does not insert necessary guards
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描述
Tier 2 trace projection can project traces through branches, calls, etc.
Currently we rely on the tier 1 instruction definition to perform the necessary checks, but this is flawed.
Consider a perfectly valid specialization of calls to class, that checked merely that the callable was a class.
This would be a perfectly valid instruction and will work flawlessly in tier 1, but will be wrong in a tier 2 trace that assumes a specific class.
Tier 2 trace projection needs to insert the necessary guards.
A lot of these extra guards will be redundant, but we can rely on the optimizer to remove them.
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调研方向
定位 Tier 2 跟踪投影的入口点,并将其与 Tier 1 指令定义进行比较,重点关注分支和调用。定义缺失的 guard 情况,然后验证当某条指令将 callable 特化为特定类时,投影后的跟踪仍然正确,同时覆盖优化移除冗余 guard 的情况。
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- python
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- compilers
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- 缺陷
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- 5/5
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- 一周以上
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- 新手友好度
- 25/100