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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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selfhost/backend/emit_float.ludic
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@ -247,7 +247,7 @@ function emit_fp_str(v: Val) -> Val {
var d = v.code
var single = "0"
if (v.ty == "float") { d = emit_bind(`fpext float {v.code} to double`); single = "1" }
return val(emit_bind(`call ptr @lp_fp_str(double {d}, i32 {single})`), "string")
return fresh_val(emit_bind(`call ptr @lp_fp_str(double {d}, i32 {single})`), "string")
}
# @lp_fp_str(v, single): "%.*g" with the fewest digits that round-trip (through