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Diffstat (limited to 'docs/assembly.rst')
| -rw-r--r-- | docs/assembly.rst | 5 |
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diff --git a/docs/assembly.rst b/docs/assembly.rst index cf9bf840..705cd1b8 100644 --- a/docs/assembly.rst +++ b/docs/assembly.rst @@ -647,6 +647,11 @@ Solidity manages memory in a very simple way: There is a "free memory pointer" at position ``0x40`` in memory. If you want to allocate memory, just use the memory from that point on and update the pointer accordingly. +The first 64 bytes of memory can be used as "scratch space" for short-term +allocation. The 32 bytes after the free memory pointer (i.e. starting at ``0x60``) +is meant to be zero permanently and is used as the initial value for +empty dynamic memory arrays. + Elements in memory arrays in Solidity always occupy multiples of 32 bytes (yes, this is even true for ``byte[]``, but not for ``bytes`` and ``string``). Multi-dimensional memory arrays are pointers to memory arrays. The length of a dynamic array is stored at the |