bpo-33125: Add support for building and releasing Windows ARM64 packages (GH-16828)

Note that the support is not actually enabled yet, and so we won't be publishing these packages. However, for those who want to build it themselves (even by reusing the Azure Pipelines definition), it's now relatively easy to enable.

5 files changed, 113 insertions, 48 deletions

diff --git a/PC/layout/main.py b/PC/layout/main.py
index 3ca49d08e8..305cb517d0 100644
--- a/PC/layout/main.py
+++ b/PC/layout/main.py
@@ -285,14 +285,13 @@ def _compile_one_py(src, dest, name, optimize, checked=True):
         log_warning("Failed to compile {}", src)
         return None
 
+
 # name argument added to address bpo-37641
 def _py_temp_compile(src, name, ns, dest_dir=None, checked=True):
     if not ns.precompile or src not in PY_FILES or src.parent in DATA_DIRS:
         return None
     dest = (dest_dir or ns.temp) / (src.stem + ".pyc")
-    return _compile_one_py(
-        src, dest, name, optimize=2, checked=checked
-    )
+    return _compile_one_py(src, dest, name, optimize=2, checked=checked)
 
 
 def _write_to_zip(zf, dest, src, ns, checked=True):
@@ -497,6 +496,13 @@ def main():
         "-b", "--build", metavar="dir", help="Specify the build directory", type=Path
     )
     parser.add_argument(
+        "--arch",
+        metavar="architecture",
+        help="Specify the target architecture",
+        type=str,
+        default=None,
+    )
+    parser.add_argument(
         "--doc-build",
         metavar="dir",
         help="Specify the docs build directory",
@@ -587,6 +593,8 @@ def main():
         ns.doc_build = (Path.cwd() / ns.doc_build).resolve()
     if ns.include_cat and not ns.include_cat.is_absolute():
         ns.include_cat = (Path.cwd() / ns.include_cat).resolve()
+    if not ns.arch:
+        ns.arch = "amd64" if sys.maxsize > 2 ** 32 else "win32"
 
     if ns.copy and not ns.copy.is_absolute():
         ns.copy = (Path.cwd() / ns.copy).resolve()
@@ -602,6 +610,7 @@ def main():
 Source: {ns.source}
 Build:  {ns.build}
 Temp:   {ns.temp}
+Arch:   {ns.arch}
 
 Copy to: {ns.copy}
 Zip to:  {ns.zip}
@@ -609,6 +618,15 @@ Catalog: {ns.catalog}""",
         ns=ns,
     )
 
+    if ns.arch not in ("win32", "amd64", "arm32", "arm64"):
+        log_error("--arch is not a valid value (win32, amd64, arm32, arm64)")
+        return 4
+    if ns.arch in ("arm32", "arm64"):
+        for n in ("include_idle", "include_tcltk"):
+            if getattr(ns, n):
+                log_warning(f"Disabling --{n.replace('_', '-')} on unsupported platform")
+                setattr(ns, n, False)
+
     if ns.include_idle and not ns.include_tcltk:
         log_warning("Assuming --include-tcltk to support --include-idle")
         ns.include_tcltk = True
diff --git a/PC/layout/support/appxmanifest.py b/PC/layout/support/appxmanifest.py
index de5813a253..9e008f793c 100644
--- a/PC/layout/support/appxmanifest.py
+++ b/PC/layout/support/appxmanifest.py
@@ -28,7 +28,14 @@ APPX_DATA = dict(
     ),
     DisplayName="Python {}".format(VER_DOT),
     Description="The Python {} runtime and console.".format(VER_DOT),
-    ProcessorArchitecture="x64" if IS_X64 else "x86",
+)
+
+APPX_PLATFORM_DATA = dict(
+    _keys=("ProcessorArchitecture",),
+    win32=("x86",),
+    amd64=("x64",),
+    arm32=("arm",),
+    arm64=("arm64",),
 )
 
 PYTHON_VE_DATA = dict(
@@ -65,7 +72,7 @@ IDLE_VE_DATA = dict(
     BackgroundColor="transparent",
 )
 
-PY_PNG = '_resources/py.png'
+PY_PNG = "_resources/py.png"
 
 APPXMANIFEST_NS = {
     "": "http://schemas.microsoft.com/appx/manifest/foundation/windows10",
@@ -147,18 +154,22 @@ RESOURCES_XML_TEMPLATE = r"""<?xml version="1.0" encoding="UTF-8" standalone="ye
 
 SCCD_FILENAME = "PC/classicAppCompat.sccd"
 
+SPECIAL_LOOKUP = object()
+
 REGISTRY = {
     "HKCU\\Software\\Python\\PythonCore": {
         VER_DOT: {
             "DisplayName": APPX_DATA["DisplayName"],
             "SupportUrl": "https://www.python.org/",
-            "SysArchitecture": "64bit" if IS_X64 else "32bit",
+            "SysArchitecture": SPECIAL_LOOKUP,
             "SysVersion": VER_DOT,
             "Version": "{}.{}.{}".format(VER_MAJOR, VER_MINOR, VER_MICRO),
             "InstallPath": {
                 "": "[{AppVPackageRoot}]",
                 "ExecutablePath": "[{{AppVPackageRoot}}]\\python{}.exe".format(VER_DOT),
-                "WindowedExecutablePath": "[{{AppVPackageRoot}}]\\pythonw{}.exe".format(VER_DOT),
+                "WindowedExecutablePath": "[{{AppVPackageRoot}}]\\pythonw{}.exe".format(
+                    VER_DOT
+                ),
             },
             "Help": {
                 "Main Python Documentation": {
@@ -338,6 +349,16 @@ def _get_registry_entries(ns, root="", d=None):
                 if len(fullkey.parts) > 1:
                     yield str(fullkey), None, None
             yield from _get_registry_entries(ns, fullkey, value)
+        elif value is SPECIAL_LOOKUP:
+            if key == "SysArchitecture":
+                return {
+                    "win32": "32bit",
+                    "amd64": "64bit",
+                    "arm32": "32bit",
+                    "arm64": "64bit",
+                }[ns.arch]
+            else:
+                raise ValueError(f"Key '{key}' unhandled for special lookup")
         elif len(r.parts) > 1:
             yield str(r), key, value
 
@@ -376,14 +397,18 @@ def get_appxmanifest(ns):
     NS = APPXMANIFEST_NS
     QN = ET.QName
 
+    data = dict(APPX_DATA)
+    for k, v in zip(APPX_PLATFORM_DATA["_keys"], APPX_PLATFORM_DATA[ns.arch]):
+        data[k] = v
+
     node = xml.find("m:Identity", NS)
     for k in node.keys():
-        value = APPX_DATA.get(k)
+        value = data.get(k)
         if value:
             node.set(k, value)
 
     for node in xml.find("m:Properties", NS):
-        value = APPX_DATA.get(node.tag.rpartition("}")[2])
+        value = data.get(node.tag.rpartition("}")[2])
         if value:
             node.text = value
 
@@ -405,7 +430,7 @@ def get_appxmanifest(ns):
         ["python", "python{}".format(VER_MAJOR), "python{}".format(VER_DOT)],
         PYTHON_VE_DATA,
         "console",
-        ("python.file", [".py"], '"%1"', 'Python File', PY_PNG),
+        ("python.file", [".py"], '"%1"', "Python File", PY_PNG),
     )
 
     add_application(
@@ -416,7 +441,7 @@ def get_appxmanifest(ns):
         ["pythonw", "pythonw{}".format(VER_MAJOR), "pythonw{}".format(VER_DOT)],
         PYTHONW_VE_DATA,
         "windows",
-        ("python.windowedfile", [".pyw"], '"%1"', 'Python File (no console)', PY_PNG),
+        ("python.windowedfile", [".pyw"], '"%1"', "Python File (no console)", PY_PNG),
     )
 
     if ns.include_pip and ns.include_launchers:
@@ -428,7 +453,7 @@ def get_appxmanifest(ns):
             ["pip", "pip{}".format(VER_MAJOR), "pip{}".format(VER_DOT)],
             PIP_VE_DATA,
             "console",
-            ("python.wheel", [".whl"], 'install "%1"', 'Python Wheel'),
+            ("python.wheel", [".whl"], 'install "%1"', "Python Wheel"),
         )
 
     if ns.include_idle and ns.include_launchers:
diff --git a/PC/layout/support/constants.py b/PC/layout/support/constants.py
index d76fa3bbf3..a8647631e9 100644
--- a/PC/layout/support/constants.py
+++ b/PC/layout/support/constants.py
@@ -5,15 +5,31 @@ Constants for generating the layout.
 __author__ = "Steve Dower <steve.dower@python.org>"
 __version__ = "3.8"
 
+import os
+import re
 import struct
 import sys
 
-VER_MAJOR, VER_MINOR, VER_MICRO, VER_FIELD4 = struct.pack(">i", sys.hexversion)
+
+def _unpack_hexversion():
+    try:
+        hexversion = int(os.getenv("PYTHON_HEXVERSION"), 16)
+    except (TypeError, ValueError):
+        hexversion = sys.hexversion
+    return struct.pack(">i", sys.hexversion)
+
+
+def _get_suffix(field4):
+    name = {0xA0: "a", 0xB0: "b", 0xC0: "c"}.get(field4 & 0xF0, "")
+    if name:
+        serial = field4 & 0x0F
+        return f"{name}{serial}"
+    return ""
+
+
+VER_MAJOR, VER_MINOR, VER_MICRO, VER_FIELD4 = _unpack_hexversion()
+VER_SUFFIX = _get_suffix(VER_FIELD4)
 VER_FIELD3 = VER_MICRO << 8 | VER_FIELD4
-VER_NAME = {"alpha": "a", "beta": "b", "candidate": "rc"}.get(
-    sys.version_info.releaselevel, ""
-)
-VER_SERIAL = sys.version_info.serial if VER_NAME else ""
 VER_DOT = "{}.{}".format(VER_MAJOR, VER_MINOR)
 
 PYTHON_DLL_NAME = "python{}{}.dll".format(VER_MAJOR, VER_MINOR)
@@ -21,8 +37,6 @@ PYTHON_STABLE_DLL_NAME = "python{}.dll".format(VER_MAJOR)
 PYTHON_ZIP_NAME = "python{}{}.zip".format(VER_MAJOR, VER_MINOR)
 PYTHON_PTH_NAME = "python{}{}._pth".format(VER_MAJOR, VER_MINOR)
 
-PYTHON_CHM_NAME = "python{}{}{}{}{}.chm".format(
-    VER_MAJOR, VER_MINOR, VER_MICRO, VER_NAME, VER_SERIAL
+PYTHON_CHM_NAME = "python{}{}{}{}.chm".format(
+    VER_MAJOR, VER_MINOR, VER_MICRO, VER_SUFFIX
 )
-
-IS_X64 = sys.maxsize > 2 ** 32
diff --git a/PC/layout/support/nuspec.py b/PC/layout/support/nuspec.py
index ba26ff337e..b85095c555 100644
--- a/PC/layout/support/nuspec.py
+++ b/PC/layout/support/nuspec.py
@@ -13,25 +13,21 @@ PYTHON_NUSPEC_NAME = "python.nuspec"
 NUSPEC_DATA = {
     "PYTHON_TAG": VER_DOT,
     "PYTHON_VERSION": os.getenv("PYTHON_NUSPEC_VERSION"),
-    "PYTHON_BITNESS": "64-bit" if IS_X64 else "32-bit",
-    "PACKAGENAME": os.getenv("PYTHON_NUSPEC_PACKAGENAME"),
-    "PACKAGETITLE": os.getenv("PYTHON_NUSPEC_PACKAGETITLE"),
     "FILELIST": r'    <file src="**\*" target="tools" />',
 }
 
-if not NUSPEC_DATA["PYTHON_VERSION"]:
-    if VER_NAME:
-        NUSPEC_DATA["PYTHON_VERSION"] = "{}.{}-{}{}".format(
-            VER_DOT, VER_MICRO, VER_NAME, VER_SERIAL
-        )
-    else:
-        NUSPEC_DATA["PYTHON_VERSION"] = "{}.{}".format(VER_DOT, VER_MICRO)
-
-if not NUSPEC_DATA["PACKAGETITLE"]:
-    NUSPEC_DATA["PACKAGETITLE"] = "Python" if IS_X64 else "Python (32-bit)"
+NUSPEC_PLATFORM_DATA = dict(
+    _keys=("PYTHON_BITNESS", "PACKAGENAME", "PACKAGETITLE"),
+    win32=("32-bit", "pythonx86", "Python (32-bit)"),
+    amd64=("64-bit", "python", "Python"),
+    arm32=("ARM", "pythonarm", "Python (ARM)"),
+    arm64=("ARM64", "pythonarm64", "Python (ARM64)"),
+)
 
-if not NUSPEC_DATA["PACKAGENAME"]:
-    NUSPEC_DATA["PACKAGENAME"] = "python" if IS_X64 else "pythonx86"
+if not NUSPEC_DATA["PYTHON_VERSION"]:
+    NUSPEC_DATA["PYTHON_VERSION"] = "{}.{}{}{}".format(
+        VER_DOT, VER_MICRO, "-" if VER_SUFFIX else "", VER_SUFFIX
+    )
 
 FILELIST_WITH_PROPS = r"""    <file src="**\*" exclude="python.props" target="tools" />
     <file src="python.props" target="build\native" />"""
@@ -56,11 +52,21 @@ NUSPEC_TEMPLATE = r"""<?xml version="1.0"?>
 """
 
 
+def _get_nuspec_data_overrides(ns):
+    for k, v in zip(NUSPEC_PLATFORM_DATA["_keys"], NUSPEC_PLATFORM_DATA[ns.arch]):
+        ev = os.getenv("PYTHON_NUSPEC_" + k)
+        if ev:
+            yield k, ev
+        yield k, v
+
+
 def get_nuspec_layout(ns):
     if ns.include_all or ns.include_nuspec:
-        data = NUSPEC_DATA
+        data = dict(NUSPEC_DATA)
+        for k, v in _get_nuspec_data_overrides(ns):
+            if not data.get(k):
+                data[k] = v
         if ns.include_all or ns.include_props:
-            data = dict(data)
             data["FILELIST"] = FILELIST_WITH_PROPS
         nuspec = NUSPEC_TEMPLATE.format_map(data)
         yield "python.nuspec", ("python.nuspec", nuspec.encode("utf-8"))
diff --git a/PC/layout/support/props.py b/PC/layout/support/props.py
index 4d3b06195f..b1560b5244 100644
--- a/PC/layout/support/props.py
+++ b/PC/layout/support/props.py
@@ -18,15 +18,9 @@ PROPS_DATA = {
 }
 
 if not PROPS_DATA["PYTHON_VERSION"]:
-    if VER_NAME:
-        PROPS_DATA["PYTHON_VERSION"] = "{}.{}-{}{}".format(
-            VER_DOT, VER_MICRO, VER_NAME, VER_SERIAL
-        )
-    else:
-        PROPS_DATA["PYTHON_VERSION"] = "{}.{}".format(VER_DOT, VER_MICRO)
-
-if not PROPS_DATA["PYTHON_PLATFORM"]:
-    PROPS_DATA["PYTHON_PLATFORM"] = "x64" if IS_X64 else "Win32"
+    PROPS_DATA["PYTHON_VERSION"] = "{}.{}{}{}".format(
+        VER_DOT, VER_MICRO, "-" if VER_SUFFIX else "", VER_SUFFIX
+    )
 
 PROPS_DATA["PYTHON_TARGET"] = "_GetPythonRuntimeFilesDependsOn{}{}_{}".format(
     VER_MAJOR, VER_MINOR, PROPS_DATA["PYTHON_PLATFORM"]
@@ -94,5 +88,13 @@ PROPS_TEMPLATE = r"""<?xml version="1.0" encoding="utf-8"?>
 def get_props_layout(ns):
     if ns.include_all or ns.include_props:
         # TODO: Filter contents of props file according to included/excluded items
-        props = PROPS_TEMPLATE.format_map(PROPS_DATA)
+        d = dict(PROPS_DATA)
+        if not d.get("PYTHON_PLATFORM"):
+            d["PYTHON_PLATFORM"] = {
+                "win32": "Win32",
+                "amd64": "X64",
+                "arm32": "ARM",
+                "arm64": "ARM64",
+            }[ns.arch]
+        props = PROPS_TEMPLATE.format_map(d)
         yield "python.props", ("python.props", props.encode("utf-8"))