Add segment size printout to standard build process (#6525)

Since IRAM is such a precious resource on the ESP8266, dump out its size
(and all other segments) at the end of the build process.

Ex:
Executable segment sizes:
IROM   : 338932
IRAM   : 27263
DATA   : 1476
RODATA : 2896
BSS    : 30304
Sketch uses 370567 bytes (35%) of program storage space. Maximum is 1044464 bytes.
Global variables use 34676 bytes (42%) of dynamic memory, leaving 47244 bytes for local variables. Maximum is 81920 bytes.

platform.txt

@@ -15,6 +15,7 @@ runtime.tools.python3.path={runtime.platform.path}/tools/python3
 runtime.tools.esptool.path={runtime.platform.path}/tools/esptool
 runtime.tools.signing={runtime.platform.path}/tools/signing.py
 runtime.tools.elf2bin={runtime.platform.path}/tools/elf2bin.py
+runtime.tools.sizes={runtime.platform.path}/tools/sizes.py
 runtime.tools.makecorever={runtime.platform.path}/tools/makecorever.py
 runtime.tools.eboot={runtime.platform.path}/bootloaders/eboot/eboot.elf
 
@@ -112,6 +113,7 @@ recipe.objcopy.eep.pattern=
 ## Create hex
 recipe.objcopy.hex.1.pattern="{runtime.tools.python3.path}/python3" "{runtime.tools.elf2bin}" --eboot "{runtime.tools.eboot}" --app "{build.path}/{build.project_name}.elf" --flash_mode {build.flash_mode} --flash_freq {build.flash_freq} --flash_size {build.flash_size} --path "{runtime.tools.xtensa-lx106-elf-gcc.path}/bin" --out "{build.path}/{build.project_name}.bin"
 recipe.objcopy.hex.2.pattern="{runtime.tools.python3.path}/python3" "{runtime.tools.signing}" --mode sign --privatekey "{build.source.path}/private.key" --bin "{build.path}/{build.project_name}.bin" --out "{build.path}/{build.project_name}.bin.signed" --legacy "{build.path}/{build.project_name}.bin.legacy_sig"
+recipe.objcopy.hex.3.pattern="{runtime.tools.python3.path}/python3" "{runtime.tools.sizes}" --elf "{build.path}/{build.project_name}.elf" --path "{runtime.tools.xtensa-lx106-elf-gcc.path}/bin"
 
 ## Save hex
 recipe.output.tmp_file={build.project_name}.bin

tools/sizes.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python3
+
+# Display the segment sizes used by an ELF
+#
+# Copyright (C) 2019 - Earle F. Philhower, III
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+from __future__ import print_function
+import argparse
+import os
+import subprocess
+import sys
+
+def get_segment_sizes(elf, path):
+    sizes = {}
+    sizes['IROM'] = 0
+    sizes['IRAM'] = 0
+    sizes['DATA'] = 0
+    sizes['RODATA'] = 0
+    sizes['BSS'] = 0
+    p = subprocess.Popen([path + "/xtensa-lx106-elf-size", '-A', elf], stdout=subprocess.PIPE, universal_newlines=True )
+    lines = p.stdout.readlines()
+    for line in lines:
+        words = line.split()
+        if line.startswith('.irom0.text'):
+            sizes['IROM'] = sizes['IROM'] + int(words[1])
+        elif line.startswith('.text'): # Gets .text and .text1
+            sizes['IRAM'] = sizes['IRAM'] + int(words[1])
+        elif line.startswith('.data'): # Gets .text and .text1
+            sizes['DATA'] = sizes['DATA'] + int(words[1])
+        elif line.startswith('.rodata'): # Gets .text and .text1
+            sizes['RODATA'] = sizes['RODATA'] + int(words[1])
+        elif line.startswith('.bss'): # Gets .text and .text1
+            sizes['BSS'] = sizes['BSS'] + int(words[1])
+    return sizes
+
+def main():
+    parser = argparse.ArgumentParser(description='Report the different segment sizes of a compiled ELF file')
+    parser.add_argument('-e', '--elf', action='store', required=True, help='Path to the Arduino sketch ELF')
+    parser.add_argument('-p', '--path', action='store', required=True, help='Path to Xtensa toolchain binaries')
+
+    args = parser.parse_args()
+    sizes = get_segment_sizes(args.elf, args.path)
+
+    sys.stderr.write("Executable segment sizes:" + os.linesep)
+    for k in sizes.keys():
+        sys.stderr.write("%-7s: %d%s" % (k, sizes[k], os.linesep))
+
+    return 0
+
+if __name__ == '__main__':
+    sys.exit(main())