Generate a RAM map

build/device/ram_map.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python
+
+import re
+import subprocess
+import sys
+import matplotlib.pyplot as plt
+from matplotlib.ticker import FormatStrFormatter
+
+readelf_line_regex = re.compile("[0-9]+:\s+([0-9a-f]+)\s+([0-9]+)\s+[A-Z]+")
+def parse_line(line):
+  hex_start, dec_size = re.findall(readelf_line_regex, line)[0]
+  return (int(hex_start, 16), int(dec_size))
+
+readelf_output = subprocess.check_output([
+  "arm-none-eabi-readelf",
+  "-W", # Don't limit line lenght
+  "-s", # Sizes
+  sys.argv[1]
+]).decode('utf-8')
+
+for line in readelf_output.splitlines():
+  words = line.split()
+  if not words:
+    continue
+  symbol = words[-1]
+  if symbol == "_ZN3Ion17staticStorageAreaE":
+    storage = parse_line(line)
+  if symbol == "_ZZN13AppsContainer19sharedAppsContainerEvE20appsContainerStorage":
+    container = parse_line(line)
+  if symbol == "_stack_start":
+    stack_start, _ = parse_line(line)
+  if symbol == "_stack_end":
+    stack_end, _ = parse_line(line)
+  if symbol == "_heap_start":
+    heap_start, _ = parse_line(line)
+  if symbol == "_heap_end":
+    heap_end, _ = parse_line(line)
+
+stack_size = stack_start - stack_end # Stack grows downwards
+stack = (stack_end, stack_size)
+heap_size = heap_end - heap_start
+heap = (heap_start, heap_size)
+
+def format_kb(i):
+  return ("%d KB" % (i/1024))
+
+fig,ax = plt.subplots()
+
+def plot(value, name, c):
+  ax.broken_barh([value], (0, 1), color=c, label=name + " - " + format_kb(value[1]))
+
+plot(container, "Container", "blue")
+plot(storage, "Storage", "red")
+plot(heap, "Heap", "pink")
+plot(stack, "Stack", "green")
+
+ax.set_yticks([])
+ax.set_xticks(list(range(0x20000000,0x20040001,0x10000)))
+xlabels = map(lambda t: '0x%08X' % int(t), ax.get_xticks())
+ax.set_xticklabels(xlabels);
+ax.legend()
+fig.set_size_inches(20, 2)
+fig.savefig(sys.argv[2])
+

build/targets.device.mak

@@ -20,6 +20,12 @@ $(eval $(call rule_for, \
   with_local_version \
 ))
 
+$(eval $(call rule_for, \
+  RAMSIZE, %_ram_map.png, %.$$(EXE), \
+  $$(PYTHON) build/device/ram_map.py $$< $$@, \
+  with_local_version \
+))
+
 .PHONY: %_size
 %_size: $(BUILD_DIR)/%.$(EXE)
 	@echo "========= BUILD OUTPUT ========"