Add a simple tool to analyze elf files

CHANGELOG.md

@@ -3,6 +3,7 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
+ - Add a simple python tool to check the elf sizes (@slurdge)
  - Change: new keys for Vigik badges in default_keys.dict (@luminouw)
  - Add 'hw standalone' to jump to standalone mode from command line or script (@doegox)
  - Add to 'hf 14a apdu' print apdu and compose apdu (@merlokk)

tools/analyzesize.py

@@ -0,0 +1,31 @@
+#! /usr/bin/python3
+
+import json
+import subprocess
+import sys
+
+def print_increase(x, y, name):
+    if x > y:
+        print("{} increase by: {} (0x{:08X}) bytes ({}%)".format(name, x-y, x-y, (x-y)*100/y))
+    else:
+        print("{} decrease by: {} (0x{:08X}) bytes ({}%)".format(name, y-x, y-x, (y-x)*100/x))
+dbname = "tools/data.json"
+db = json.load(open(dbname,"r"))
+
+if len(sys.argv) < 3:
+    print("Usage: analazysize.py <info|add|diff> <datasetname>")
+    exit(-1)
+action, name = sys.argv[1:3]
+currentdata = subprocess.run(["arm-none-eabi-size","armsrc/obj/fullimage.stage1.elf"], stdout=subprocess.PIPE).stdout
+currentdata = currentdata.split(b"\n")[1].strip()
+text,data,bss = [int(x) for x in currentdata.split(b"\t")[:3]]
+if action.lower() == "add":
+    db[name] = [text, data, bss]
+    json.dump(db, open(dbname, "w"))
+elif action.lower() == "diff":
+    text_ref, data_ref, bss_ref = db[name]
+    flash_ref = text_ref+data_ref
+    flash = text+data
+    print_increase(flash, flash_ref, "Flash")
+    print_increase(bss, bss_ref, "RAM")
+