compile-time evaluation of hex..end size

[x87]

It's a common pattern to calculate the size of a hex..end block in runtime. It can be needed if you need to know the size of block to copy it entirely somewhere, or know when it ends when iterating.

Because hex..end is static, its size can be pre-calculated by the compiler as a const value.

E.g.

:buf
hex
00(16)
end

const bufSize = sizeof(@buf) // 16

Proposed syntax is just for illustrative purposes and may change.

[x87]

feature can be extended to evaluate size of arrays and string literals

int a[10]
string s = 'test'
longstring v = "str"
const arrSize = length(a) // 10
const sSize = length(s) // 5 (4 chars+null terminator)
const vSize = length(v) // 3
const hexSize = length(@hex) // 16

:hex
hex
00(16)
end

[x87]

as an alternative the following snippet can be used

in CLEO scripts/missions/external scripts, where labels are compiled as negative offsets

:start
hex
00(16)
end
:end


int hex_size = @start - @end // 16

in main.scm:

:start
hex
00(16)
end
:end


int hex_size = @end - @start // 16