10000 gh-119786: move exception handling doc to InternalDocs by iritkatriel · Pull Request #119815 · python/cpython · GitHub
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gh-119786: move exception handling doc to InternalDocs #119815

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Merged
merged 10 commits into from
Jun 3, 2024
Merged

gh-119786: move exception handling doc to InternalDocs #119815

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81a0e13
rename index->README and move exception handling doc to new folder
iritkatriel May 30, 2024
cd7725f
add link to exception handling file from index
iritkatriel May 30, 2024
7719234
edit exception handling
iritkatriel May 30, 2024
023ad9d
whitespace
iritkatriel May 30, 2024
fc5d217
formatting
iritkatriel May 30, 2024
3436cdf
formatting
iritkatriel May 31, 2024
49af193
add explanation of reraise and lasti. fix typos
iritkatriel May 31, 2024
d299a3e
address review - clarify pseudo-instructions/intermediate code
iritkatriel May 31, 2024
e93a253
fix markup
iritkatriel May 31, 2024
a3da517
typo
iritkatriel Jun 3, 2024
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fix markup
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@iritkatriel
iritkatriel committed May 31, 2024
commit e93a253d93e99c50e9e3e14cd64b8206b1b1679f
5 changes: 4 additions & 1 deletion InternalDocs/exception_handling.md
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Expand Up @@ -126,11 +126,13 @@ Also, sizes are limited to 2**30 as the code length cannot exceed 2**31 and each
It also happens that depth is generally quite small.

So, we need to encode:
```
`start` (up to 30 bits)
`size` (up to 30 bits)
`target` (up to 30 bits)
`depth` (up to ~8 bits)
`lasti` (1 bit)
```

We need a marker for the start of the entry, so the first byte of entry will have the most significant bit set.
Since the most significant bit is reserved for marking the start of an entry, we have 7 bits per byte to encode offsets.
Expand All @@ -157,16 +159,17 @@ is encoded by first converting to the more compact four value form:
```

which is then encoded as:
```
148 (MSB + 20 for start)
8 (size)
65 (Extend bit + 1)
36 (Remainder of target, 100 == (1<<6)+36)
6
```

for a total of five bytes.



Script to parse the exception table
-----------------------------------

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