platform: calculate sketch size with NO_RELOC support

Signed-off-by: Gilberto Conti <g.conti@arduino.cc>

Author: gibix

extra/artifacts/_common.inc

@@ -16,3 +16,4 @@ doc/
 cores/
 libraries/
 variants/_ldscripts/
+extra/check_size.sh

extra/check_size.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+#
+# Copyright (c) Arduino s.r.l. and/or its affiliated companies
+# SPDX-License-Identifier: Apache-2.0
+#
+# Wrapper for arm-zephyr-eabi-size that dynamically adjusts section
+# accounting based on CONFIG_LLEXT_RODATA_NO_RELOC.
+#
+# When CONFIG_LLEXT_RODATA_NO_RELOC=y (in loader/prj.conf or variant .conf):
+#   .llext.rodata.noreloc stays in flash -> rename to .flash.llext.* so
+#   regex.data won't count it against the LLEXT heap limit.
+#
+# When CONFIG_LLEXT_RODATA_NO_RELOC=n or unset:
+#   .llext.rodata.noreloc is copied to LLEXT heap -> keep the name so
+#   regex.data counts it against the heap limit.
+#
+# Usage (from platform.txt):
+#   recipe.size.pattern=bash "{runtime.platform.path}/extra/check_size.sh"
+#     "{compiler.path}{compiler.size.cmd}" "{build.path}/{build.project_name}.elf"
+#     "{build.variant.path}"
+#
+
+SIZE_CMD="$1"
+ELF="$2"
+VARIANT_DIR="$3"
+
+output=$("$SIZE_CMD" -A "$ELF")
+
+# Check if RODATA_NO_RELOC is enabled in the loader or variant config.
+# The loader's prj.conf is two levels up from the variant dir (in the
+# platform root), but we also check the variant-specific .conf.
+PLATFORM_DIR=$(dirname "$(dirname "$VARIANT_DIR")")
+rodata_no_reloc=false
+for conf in "$PLATFORM_DIR/loader/prj.conf" "$VARIANT_DIR"/*.conf; do
+  if [ -f "$conf" ] && grep -q "^CONFIG_LLEXT_RODATA_NO_RELOC=y" "$conf" 2>/dev/null; then
+    rodata_no_reloc=true
+    break
+  fi
+done
+
+if $rodata_no_reloc; then
+  # Rename .llext.* -> .flash.llext.* so regex.data won't match,
+  # but regex (flash/program space) still matches via .flash.llext.
+  echo "$output" | sed 's/^\.llext\./.flash.llext./'
+else
+  echo "$output"
+fi

platform.txt

@@ -143,9 +143,12 @@ recipe.hooks.objcopy.postobjcopy.1.pattern="{runtime.tools.zephyr-sketch-tool.pa
 recipe.hooks.objcopy.postobjcopy.2.pattern="{runtime.tools.zephyr-sketch-tool.path}/zephyr-sketch-tool" {build.zsk_args.debug} {build.zsk_args.mode-{build.link_mode}} {build.zsk_args.startup-mode-{build.boot_mode}} "{build.path}/{build.project_name}.bin"
 
 ## Compute size
-recipe.size.pattern="{compiler.path}{compiler.size.cmd}" -A "{build.path}/{build.project_name}.elf"
-recipe.size.regex.data=^(?:\.data|\.bss)\s+([0-9]+).*
-recipe.size.regex=^(?:\.data|\.text|\.rodata)\S*?\s+([0-9]+).*
+## Uses check_size.sh wrapper to dynamically handle CONFIG_LLEXT_RODATA_NO_RELOC:
+## When =y, .llext.* sections stay in flash (renamed to .flash.llext.* so regex.data skips them).
+## When =n, .llext.* sections are copied to LLEXT heap (counted by regex.data).
+recipe.size.pattern=bash "{runtime.platform.path}/extra/check_size.sh" "{compiler.path}{compiler.size.cmd}" "{build.path}/{build.project_name}.elf" "{build.variant.path}"
+recipe.size.regex.data=^(?:\.data|\.bss|\.text|\.rodata|\.llext\.)\S*?\s+([0-9]+).*
+recipe.size.regex=^(?:\.data|\.text|\.rodata|\.llext\.|\.flash\.llext\.)\S*?\s+([0-9]+).*
 
 ## Save output file
 recipe.output.tmp_file={build.project_name}.{upload.extension}