From d6f3c823aaf2ab5e9c383a09dddfb7f29cc712ba Mon Sep 17 00:00:00 2001
From: Hocuri <hocuri@gmx.de>
Date: Mon, 3 Aug 2026 12:59:03 +0200
Subject: [PATCH 1/3] chore: Add script to show the sizes of futures (async
 Rust)

---
 scripts/future-sizes.sh | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100755 scripts/future-sizes.sh

diff --git a/scripts/future-sizes.sh b/scripts/future-sizes.sh
new file mode 100755
index 0000000000..750f58f6a0
--- /dev/null
+++ b/scripts/future-sizes.sh
@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Report the largest async-fn futures using rustc's unstable -Zprint-type-sizes.
+#
+# Usage: scripts/future-sizes.sh [TOP_N]     (default: 30)
+#
+# Uses a dedicated target dir so the normal build cache is untouched
+# and repeated runs only recompile the core crate itself.
+
+TOP_N="${1:-30}"
+
+export CARGO_TARGET_DIR="target/type-sizes"
+export RUSTFLAGS="-Zprint-type-sizes"
+export RUSTC_BOOTSTRAP=1
+
+# Warm the dependency cache so their output doesn't pollute the report later.
+cargo check -q --release -p deltachat
+
+# Recompile only the core crate (release) capture its type-size report.
+cargo clean --release -p deltachat
+report="$CARGO_TARGET_DIR/type-sizes.txt"
+if ! cargo check --release -p deltachat >"$report"; then
+    tail -20 "$report"
+    exit 1
+fi
+
+sizes=$(rg '^print-type-size type: `\{async fn body of (.*)\(\)\}`: ([0-9]+) bytes' \
+    -or '$2 $1' "$report" | sort -rn | uniq)
+if [ -z "$sizes" ]; then
+    echo "error: no type-size output found, see $report" >&2
+    exit 1
+fi
+
+echo "Largest async fn futures in deltachat (top $TOP_N, bytes):"
+head -"$TOP_N" <<<"$sizes"
+
+echo
+echo "Full report (all types, with per-field breakdown): $report"

From 333c28609d16c2374270c8fe266f286e9b7b8f23 Mon Sep 17 00:00:00 2001
From: Hocuri <hocuri@gmx.de>
Date: Mon, 3 Aug 2026 15:44:05 +0200
Subject: [PATCH 2/3] When warming the dependency cache, print progress but no
 future sizes yet

---
 scripts/future-sizes.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/future-sizes.sh b/scripts/future-sizes.sh
index 750f58f6a0..f153dee5cf 100755
--- a/scripts/future-sizes.sh
+++ b/scripts/future-sizes.sh
@@ -15,7 +15,7 @@ export RUSTFLAGS="-Zprint-type-sizes"
 export RUSTC_BOOTSTRAP=1
 
 # Warm the dependency cache so their output doesn't pollute the report later.
-cargo check -q --release -p deltachat
+cargo check --release -p deltachat >/dev/null
 
 # Recompile only the core crate (release) capture its type-size report.
 cargo clean --release -p deltachat

From 2971bb3e6d05129c862fbfde59c5029222082289 Mon Sep 17 00:00:00 2001
From: Hocuri <hocuri@gmx.de>
Date: Mon, 3 Aug 2026 15:50:34 +0200
Subject: [PATCH 3/3] Make sure Cargo.lock isn't changed

---
 scripts/future-sizes.sh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/scripts/future-sizes.sh b/scripts/future-sizes.sh
index f153dee5cf..133d77db1f 100755
--- a/scripts/future-sizes.sh
+++ b/scripts/future-sizes.sh
@@ -15,12 +15,12 @@ export RUSTFLAGS="-Zprint-type-sizes"
 export RUSTC_BOOTSTRAP=1
 
 # Warm the dependency cache so their output doesn't pollute the report later.
-cargo check --release -p deltachat >/dev/null
+cargo check --locked --release -p deltachat >/dev/null
 
 # Recompile only the core crate (release) capture its type-size report.
-cargo clean --release -p deltachat
+cargo clean --locked --release -p deltachat
 report="$CARGO_TARGET_DIR/type-sizes.txt"
-if ! cargo check --release -p deltachat >"$report"; then
+if ! cargo check --locked --release -p deltachat >"$report"; then
     tail -20 "$report"
     exit 1
 fi