[SuperSize] Extend SuperSize-archive to embrace section ranges.

Previously SuperSize-archive focuses on section sizes and largely
ignores section addresses. As a result, "** ELF Section" symbols all
have address of 0. This CL refactors archive.py so that |section_range|
(2-tuple of address and size) become a primary object of interest, and
replaces widespread |section_size| usage. Details:
* linker_map_parser.py: Changes to store and return section ranges.
  * Requires test output update.
* archive.py: Extensive changes to use ranges throughout.
  * Add _ExtendSectionRange() helper.
  * _AddUnattributedSectionSymbols(): Add "** ELF Section" symbols in
    section name order, to make later sorting more predictable.
* Not changed: CreateSectionSizesAndSymbols() params, to maintain
  .size format compatibility.

"** ELF Section:" symbols can now have non-0 addresse (and better
sort order). This required update of integration_test.py expected
outputs.

Other changes:
* Add dbg.py to aid debugging (compatible with Python 3).

Change-Id: Ife5a695a4d3d75a6c67dabae5de91c9bb9618100
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2099466Reviewed-by: Samuel Huang <huangs@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749544}

tools/binary_size/libsupersize/dbg.py

+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+"""Simple utilities for printf debugging."""
+
+import sys
+
+
+def _joinArgs(args):
+  return ' '.join(str(t) for t in args) + '\n'
+
+
+def out(*args):
+  sys.stderr.write(_joinArgs(args))
+
+
+def outR(*args):
+  sys.stderr.write('\x1b[91m%s\x1b[0m' % _joinArgs(args))
+
+
+def outG(*args):
+  sys.stderr.write('\x1b[92m%s\x1b[0m' % _joinArgs(args))
+
+
+def outY(*args):
+  sys.stderr.write('\x1b[93m%s\x1b[0m' % _joinArgs(args))
+
+
+def outB(*args):
+  sys.stderr.write('\x1b[94m%s\x1b[0m' % _joinArgs(args))
+
+
+def outM(*args):
+  sys.stderr.write('\x1b[95m%s\x1b[0m' % _joinArgs(args))
+
+
+def outC(*args):
+  sys.stderr.write('\x1b[96m%s\x1b[0m' % _joinArgs(args))

tools/binary_size/libsupersize/linker_map_parser.py

@@ -87,7 +87,7 @@ class MapFileParserGold(object):
   def __init__(self):
     self._common_symbols = []
     self._symbols = []
-    self._section_sizes = {}
+    self._section_ranges = {}
     self._lines = None
 
   def Parse(self, lines):
@@ -98,7 +98,7 @@ class MapFileParserGold(object):
       identify file type.
 
     Returns:
-      A tuple of (section_sizes, symbols, extras).
+      A tuple of (section_ranges, symbols, extras).
     """
     self._lines = iter(lines)
     logging.debug('Scanning for Header')
@@ -112,7 +112,7 @@ class MapFileParserGold(object):
       elif line.startswith('Memory map'):
         self._ParseSections()
       break
-    return self._section_sizes, self._symbols, {}
+    return self._section_ranges, self._symbols, {}
 
   def _SkipToLineWithPrefix(self, prefix, prefix2=None):
     for l in self._lines:
@@ -192,7 +192,7 @@ class MapFileParserGold(object):
         section_name, section_address_str, section_size_str = parts
         section_address = int(section_address_str[2:], 16)
         section_size = int(section_size_str[2:], 16)
-        self._section_sizes[section_name] = section_size
+        self._section_ranges[section_name] = (section_address, section_size)
         if (section_name in models.BSS_SECTIONS
             or section_name in (models.SECTION_RODATA, models.SECTION_TEXT)
             or section_name.startswith(models.SECTION_DATA)):
@@ -338,7 +338,7 @@ class MapFileParserLld(object):
   def __init__(self, linker_name):
     self._linker_name = linker_name
     self._common_symbols = []
-    self._section_sizes = {}
+    self._section_ranges = {}
 
   @staticmethod
   def ParseArmAnnotations(tok):
@@ -428,7 +428,7 @@ class MapFileParserLld(object):
       identify file type.
 
     Returns:
-      A tuple of (section_sizes, symbols).
+      A tuple of (section_ranges, symbols).
     """
     # Newest format:
     #     VMA      LMA     Size Align Out     In      Symbol
@@ -513,7 +513,7 @@ class MapFileParserLld(object):
           cur_section_is_useful = False
         else:
           if not tok.startswith('PROVIDE_HIDDEN'):
-            self._section_sizes[tok] = size
+            self._section_ranges[tok] = (address, size)
           cur_section = tok
           # E.g., Want to convert "(.text._name)" -> "_name" later.
           mangled_start_idx = len(cur_section) + 2
@@ -657,7 +657,7 @@ class MapFileParserLld(object):
     if jump_tables_count:
       logging.info('Found %d CFI jump tables with %d total entries',
                    jump_tables_count, jump_entries_count)
-    return self._section_sizes, syms, {'thin_map': thin_map}
+    return self._section_ranges, syms, {'thin_map': thin_map}
 
 
 def _DetectLto(lines):
@@ -727,7 +727,7 @@ class MapFileParser(object):
       lines: Iterable of lines from the linker map.
 
     Returns:
-      A tuple of (section_sizes, symbols, extras).
+      A tuple of (section_ranges, symbols, extras).
     """
     next(lines)  # Consume the first line of headers.
     if linker_name.startswith('lld'):
@@ -737,13 +737,13 @@ class MapFileParser(object):
     else:
       raise Exception('.map file is from a unsupported linker.')
 
-    section_sizes, syms, extras = inner_parser.Parse(lines)
+    section_ranges, syms, extras = inner_parser.Parse(lines)
     for sym in syms:
       if sym.object_path and not sym.object_path.endswith(')'):
         # Don't want '' to become '.'.
         # Thin archives' paths will get fixed in |ar.CreateThinObjectPath|.
         sym.object_path = os.path.normpath(sym.object_path)
-    return (section_sizes, syms, extras)
+    return (section_ranges, syms, extras)
 
 
 def DeduceObjectPathsFromThinMap(raw_symbols, extras):
@@ -820,20 +820,24 @@ def main():
   print('Linker type: %s' % linker_name)
 
   with open(args.linker_file, 'r') as map_file:
-    section_sizes, syms, extras = MapFileParser().Parse(linker_name, map_file)
+    section_ranges, syms, extras = MapFileParser().Parse(linker_name, map_file)
 
   if args.dump:
-    print(section_sizes)
+    print(section_ranges)
     for sym in syms:
       print(sym)
   else:
     # Enter interactive shell.
     readline.parse_and_bind('tab: complete')
-    variables = {'section_sizes': section_sizes, 'syms': syms, 'extras': extras}
+    variables = {
+        'section_ranges': section_ranges,
+        'syms': syms,
+        'extras': extras
+    }
     banner_lines = [
         '*' * 80,
         'Variables:',
-        '  section_sizes: Map from section to sizes.',
+        '  section_ranges: Map from section name to (address, size).',
         '  syms: Raw symbols parsed from the linker map file.',
         '  extras: Format-specific extra data.',
         '*' * 80,

tools/binary_size/libsupersize/linker_map_parser_test.py

@@ -51,8 +51,9 @@ def _ReadMapFile(map_file):
 def _RenderSectionSizesAndRawSymbols(section_sizes, raw_symbols):
   ret = []
   ret.append('******** section_sizes ********')
-  for k, v in sorted(section_sizes.iteritems()):
-    ret.append('%-24s %d' % (k, v))
+  for k, (address, size) in sorted(section_sizes.items()):
+    address_text = '@%x' % address
+    ret.append('%-24s %-9s %d' % (k, address_text, size))
   ret.append('')
   ret.append('******** raw_symbols ********')
   for sym in raw_symbols:

tools/binary_size/libsupersize/testdata/Archive_Apk.golden

@@ -289,33 +289,33 @@ Section .other: has 100.0% of 95595797 bytes accounted for from 27 symbols. 0 by
 .dex.method@0(size_without_padding=79,padding=0,full_name=org.chromium.chrome.browser.compositor.layouts.phone.stack.StackAnimationLandscape#getScreenPositionInScrollDirection(org.chromium.chrome.browser.compositor.layouts.phone.stack.StackTab): float,object_path=$APK/org/chromium/chrome/browser/compositor/layouts/phone/stack/StackAnimationLandscape,source_path=,flags={},num_aliases=1,component=)
 .dex.method@0(size_without_padding=54,padding=0,full_name=org.chromium.chrome.browser.compositor.layouts.phone.stack.StackAnimationLandscape#getScreenSizeInScrollDirection(): float,object_path=$APK/org/chromium/chrome/browser/compositor/layouts/phone/stack/StackAnimationLandscape,source_path=,flags={},num_aliases=1,component=)
 .dex.method@0(size_without_padding=52,padding=0,full_name=org.chromium.chrome.browser.compositor.layouts.phone.stack.StackAnimationLandscape#isDefaultDiscardDirectionPositive(): boolean,object_path=$APK/org/chromium/chrome/browser/compositor/layouts/phone/stack/StackAnimationLandscape,source_path=,flags={},num_aliases=1,component=)
-.other@0(size_without_padding=2655384,padding=0,full_name=** ELF Section: .rel.dyn,object_path=,source_path=,flags={},num_aliases=1,component=)
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-.other@0(size_without_padding=19,padding=0,full_name=** ELF Section: .interp,object_path=,source_path=,flags={},num_aliases=1,component=)
+.other@0(size_without_padding=60,padding=0,full_name=** ELF Section: .ARM.attributes,object_path=,source_path=,flags={},num_aliases=1,component=)
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 .other@0(size_without_padding=4194304,padding=0,full_name=smalltest.so,object_path=,source_path=$APK/smalltest.so,flags={gen},num_aliases=1,component=)
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 .other@0(size_without_padding=1024,padding=0,full_name=res/drawable-v13/test.xml,object_path=,source_path=chrome/android/res/drawable/test.xml,flags={},num_aliases=1,component=)
 .other@0(size_without_padding=0,padding=764,full_name=Overhead: APK file,object_path=,source_path=,flags={},num_aliases=1,component=)
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+.other@154(size_without_padding=19,padding=0,full_name=** ELF Section: .interp,object_path=,source_path=,flags={},num_aliases=1,component=)
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tools/binary_size/libsupersize/testdata/Archive_MinimalApks.golden

@@ -290,33 +290,33 @@ Section .other: has 100.0% of 95595797 bytes accounted for from 27 symbols. 0 by
 .dex.method@0(size_without_padding=79,padding=0,full_name=org.chromium.chrome.browser.compositor.layouts.phone.stack.StackAnimationLandscape#getScreenPositionInScrollDirection(org.chromium.chrome.browser.compositor.layouts.phone.stack.StackTab): float,object_path=$APK/org/chromium/chrome/browser/compositor/layouts/phone/stack/StackAnimationLandscape,source_path=,flags={},num_aliases=1,component=)
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tools/binary_size/libsupersize/testdata/linker_map_parser/Parser.golden

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tools/binary_size/libsupersize/testdata/linker_map_parser/ParserCfi.golden

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