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compiler: a string slice is a fresh temporary too

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s[a .. b] is always a copy, so it is freed once a +, a comparison or print has read it. Reseeded.
string_temps.ludic adds a slice compared and a slice concatenated each round (960 KB over 20,000
before, 0 after) and a kept slice read after its +.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-28 12:25:02 +03:00
parent 174a32c285
commit 328dee77c8
5 changed files with 940 additions and 861 deletions
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8
examples/lang/string_temps.ludic
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@ -1,5 +1,5 @@
# string_temps.ludic - a string made inside an expression and held by nothing (`a + "/"` in
# `a + "/" + b`, a template's pieces, a number's text, a side only compared) is freed as soon as it
# `a + "/" + b`, a template's pieces, a number's text, a slice, a side only compared) is freed as soon as it
# has been used, and one that IS held - in a variable, handed to a function, a function's result -
# is not. Prints 1 2 3 4 5 6 7 and `grew 0` (the heap is read on the Mac; 0 elsewhere).
program StringTemps {
@ -10,6 +10,8 @@ program StringTemps {
function round(i: int, a: string, b: string) -> int {
var bad = 0
if a + "/" + b + "/" + string(i) != `{a}/{b}/{i}` { bad += 1 }
let p = "lake/camp.png" # a literal: the slices are what is made here
if p[len(p) - 4 .. len(p)] != ".png" or p[0 .. len(p) - 4] + ".dds" != `lake/{b[0 .. 0]}camp.dds` { bad += 1 }
if `{i}-{i * 2}-{long(i) * 1000000000}` != string(i) + "-" + string(i * 2) + "-" + string(long(i) * 1000000000) { bad += 1 }
return bad
}
@ -20,7 +22,9 @@ program StringTemps {
# held intermediates stay good after the `+` that read them
let mid = a + "/"
let full = mid + b
if mid == "dir/" and full == "dir/file" { print(1) }
let head = full[0 .. 3]
let head2 = head + "!" + head
if mid == "dir/" and full == "dir/file" and head == "dir" and head2 == "dir!dir" { print(1) }
let n = string(-42)
let t = n + "!" + n
if n == "-42" and t == "-42!-42" { print(2) }