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Document change to BlockFlattener.

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This commit is contained in:
Daniel Kirchner 2021-11-09 13:25:13 +01:00
parent 9fb77b139c
commit f2d9a806e0
1 changed files with 13 additions and 7 deletions
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8
docs/internals/optimizer.rst
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@ -972,10 +972,13 @@ BlockFlattener
^^^^^^^^^^^^^^
This stage eliminates nested blocks by inserting the statement in the
inner block at the appropriate place in the outer block:
inner block at the appropriate place in the outer block. It depends on the
FunctionGrouper and does not flatten the outermost block to keep the form
produced by the FunctionGrouper.
.. code-block:: yul
{
{
let x := 2
{
@ -983,16 +986,19 @@ inner block at the appropriate place in the outer block:
mstore(x, y)
}
}
}
is transformed to
.. code-block:: yul
{
{
let x := 2
let y := 3
mstore(x, y)
}
}
As long as the code is disambiguated, this does not cause a problem because
the scopes of variables can only grow.