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compiler: free a string an expression made once it has been used

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The left half of a + chain, a template's pieces and holes, a number's text and a side made only to be
compared are marked fresh and freed after the +, ==, != or print that reads them. lp_int_str and
lp_long_str move their digits to the start of the buffer, so the pointer they return is the one
malloc gave. Reseeded. examples/lang/string_temps.ludic: kept intermediates stay good, and 20,000
rounds grow the heap 0 bytes (2.9 MB before).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-28 12:06:45 +03:00
parent 2fe4018d28
commit 9660587e10
10 changed files with 56019 additions and 48735 deletions
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bump: patch
type: fix
**A string made in the middle of an expression is freed once it has been used.** `a + "/" + b` made
`a + "/"`, copied it and kept it for ever; a template made one such piece per hole, plus each
number's text; and a side of `==` built only to be compared stayed too. The compiler now frees each
of those as soon as the next `+`, the comparison or `print` has read it, and `string(n)` hands back
the start of what it allocated so its text can be freed at all. A string held anywhere - a
variable, an argument, a function's result - is left alone. A loop of 20,000 template builds grew
2.9 MB and now grows 0 (`examples/lang/string_temps.ludic`).