feat: publish immutables layout

[charles-cooper]

What I did

publish immutables layout. since the output is a single dict of variable names (see below for ex.), I was a bit concerned about collisions between immutables and storage variables, so I went ahead and blocked those.

{"foo": {"type": "uint256", "location": "code", "offset": 0, "length": 32}, "x": {"type": "uint256", "location": "storage", "slot": 0}}

How I did it

add code offsets dict to the -f layout output

How to verify it

try

vyper -f layout /dev/stdin <<EOF
x: uint256
y: immutable(uint256)
@external
def __init__():
    y = 1
EOF

Commit message

Description for the changelog

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[codecov-commenter]

Codecov Report

Merging #2768 (33074bc) into master (df29609) will decrease coverage by 0.01%.
The diff coverage is 84.61%.

@@            Coverage Diff             @@
##           master    #2768      +/-   ##
==========================================
- Coverage   87.33%   87.32%   -0.02%     
==========================================
  Files          94       94              
  Lines       10046    10053       +7     
  Branches     2489     2490       +1     
==========================================
+ Hits         8774     8779       +5     
- Misses        804      805       +1     
- Partials      468      469       +1     

Impacted Files	Coverage Δ
vyper/semantics/validation/module.py	85.71% <0.00%> (-0.89%)	⬇️
vyper/semantics/validation/data_positions.py	91.39% <100.00%> (+0.48%)	⬆️

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[charles-cooper]

kind of wonder if we should publish as two separate dicts. e.g.

{
  "storage": [{"x": ...}, {"y": ...}],
  "code": [{"a": ...}, {"b": ...}],
}

@fubuloubu thoughts?

[fubuloubu]

kind of wonder if we should publish as two separatel dicts. e.g.

{
  "storage": [{"x": ...}, {"y": ...}],
  "code": [{"a": ...}, {"b": ...}],
}

@fubuloubu thoughts?

Are collisions even allowed?

[charles-cooper]

Are collisions even allowed?

there was a case where they were allowed, but I blocked that case in this PR. but we might not always block.

[fubuloubu]

Are collisions even allowed?

there was a case where they were allowed, but I blocked that case in this PR. but we might not always block.

I think collisions should not be allowed here. It's sort of like a global var

[charles-cooper]

meeting notes: separate into two dicts