Merge pull request #14674 from muxi/add-link-map-analyzer

Add Xcode link map analyzer script to ObjC repo

src/objective-c/tests/analyze_link_map.py

@@ -0,0 +1,78 @@
+#!/usr/bin/python
+# Copyright 2018 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script analyzes link map file generated by Xcode. It calculates and
+# prints out the sizes of each dependent library and the total sizes of the
+# symbols.
+# The script takes one parameter, which is the path to the link map file.
+
+import sys
+import re
+
+table_tag = {}
+state = "start"
+
+table_stats_symbol = {}
+table_stats_dead = {}
+section_total_size = 0
+symbol_total_size = 0
+
+
+file_import = sys.argv[1]
+lines = list(open(file_import))
+for line in lines:
+  line_stripped = line[:-1]
+  if "# Object files:" == line_stripped:
+    state = "object"
+    continue
+  elif "# Sections:" == line_stripped:
+    state = "section"
+    continue
+  elif "# Symbols:" == line_stripped:
+    state = "symbol"
+    continue
+  elif "# Dead Stripped Symbols:" == line_stripped:
+    state = "dead"
+    continue
+
+  if state == "object":
+    segs = re.search('(\[ *[0-9]*\]) (.*)', line_stripped)
+    table_tag[segs.group(1)] = segs.group(2)
+
+  if state == "section":
+    if len(line_stripped) == 0 or line_stripped[0] == '#':
+      continue
+    segs = re.search('^(.+?)\s+(.+?)\s+.*', line_stripped)
+    section_total_size += int(segs.group(2), 16)
+
+  if state == "symbol":
+    if len(line_stripped) == 0 or line_stripped[0] == '#':
+      continue
+    segs = re.search('^.+?\s+(.+?)\s+(\[.+?\]).*', line_stripped)
+    target = table_tag[segs.group(2)]
+    target_stripped = re.search('^(.*?)(\(.+?\))?$', target).group(1)
+    size = int(segs.group(1), 16)
+    if not target_stripped in table_stats_symbol:
+      table_stats_symbol[target_stripped] = 0
+    table_stats_symbol[target_stripped] += size
+
+print("Sections total size: %d" % section_total_size)
+
+for target in table_stats_symbol:
+  print(target)
+  print(table_stats_symbol[target])
+  symbol_total_size += table_stats_symbol[target]
+
+print("Symbols total size: %d" % symbol_total_size)