bpo-45850: Implement deep-freeze on Windows (#29648)

Implement changes to build with deep-frozen modules on Windows.
Note that we now require Python 3.10 as the "bootstrap" or "host" Python.
This causes a modest startup speed (around 7%) on Windows.

1 files changed, 20 insertions, 1 deletions

diff --git a/Tools/scripts/freeze_modules.py b/Tools/scripts/freeze_modules.py
index ccea4e1..61ccae6 100644
--- a/Tools/scripts/freeze_modules.py
+++ b/Tools/scripts/freeze_modules.py
@@ -11,7 +11,6 @@ import posixpath
 import platform
 import subprocess
 import sys
-import textwrap
 import time
 
 from update_file import updating_file_with_tmpfile, update_file_with_tmpfile
@@ -55,6 +54,7 @@ FROZEN_FILE = os.path.join(ROOT_DIR, 'Python', 'frozen.c')
 MAKEFILE = os.path.join(ROOT_DIR, 'Makefile.pre.in')
 PCBUILD_PROJECT = os.path.join(ROOT_DIR, 'PCbuild', '_freeze_module.vcxproj')
 PCBUILD_FILTERS = os.path.join(ROOT_DIR, 'PCbuild', '_freeze_module.vcxproj.filters')
+PCBUILD_PYTHONCORE = os.path.join(ROOT_DIR, 'PCbuild', 'pythoncore.vcxproj')
 
 
 OS_PATH = 'ntpath' if os.name == 'nt' else 'posixpath'
@@ -717,20 +717,28 @@ def regen_makefile(modules):
 def regen_pcbuild(modules):
     projlines = []
     filterlines = []
+    corelines = []
     for src in _iter_sources(modules):
         pyfile = relpath_for_windows_display(src.pyfile, ROOT_DIR)
         header = relpath_for_windows_display(src.frozenfile, ROOT_DIR)
+        deepbase = "df." + src.id
+        deepoutfile = f"Python\\deepfreeze\\{deepbase}.c"
         intfile = ntpath.splitext(ntpath.basename(header))[0] + '.g.h'
+        deepintfile = ntpath.splitext(ntpath.basename(header))[0] + '.g.c'
         projlines.append(f'    <None Include="..\\{pyfile}">')
         projlines.append(f'      <ModName>{src.frozenid}</ModName>')
         projlines.append(f'      <IntFile>$(IntDir){intfile}</IntFile>')
         projlines.append(f'      <OutFile>$(PySourcePath){header}</OutFile>')
+        projlines.append(f'      <DeepIntFile>$(IntDir){deepintfile}</DeepIntFile>')
+        projlines.append(f'      <DeepOutFile>$(PySourcePath){deepoutfile}</DeepOutFile>')
         projlines.append(f'    </None>')
 
         filterlines.append(f'    <None Include="..\\{pyfile}">')
         filterlines.append('      <Filter>Python Files</Filter>')
         filterlines.append('    </None>')
 
+        corelines.append(f'    <ClCompile Include="..\\{deepoutfile}" />')
+
     print(f'# Updating {os.path.relpath(PCBUILD_PROJECT)}')
     with updating_file_with_tmpfile(PCBUILD_PROJECT) as (infile, outfile):
         lines = infile.readlines()
@@ -753,6 +761,17 @@ def regen_pcbuild(modules):
             PCBUILD_FILTERS,
         )
         outfile.writelines(lines)
+    print(f'# Updating {os.path.relpath(PCBUILD_PYTHONCORE)}')
+    with updating_file_with_tmpfile(PCBUILD_PYTHONCORE) as (infile, outfile):
+        lines = infile.readlines()
+        lines = replace_block(
+            lines,
+            '<!-- BEGIN deepfreeze -->',
+            '<!-- END deepfreeze -->',
+            corelines,
+            PCBUILD_FILTERS,
+        )
+        outfile.writelines(lines)
 
 
 #######################################