[demo] Work on an even smaller slice of CPython.

build/compile.sh

@@ -416,4 +416,6 @@ count-c-lines() {
   popd
 }
 
-"$@"
+if test $(basename $0) = 'compile.sh'; then
+  "$@"
+fi

build/slice-2020.sh

@@ -0,0 +1,186 @@
+#!/bin/bash
+#
+# Usage:
+#   ./slice-2020.sh <function name>
+
+CFLAGS='-O0'  # for speed
+
+source build/compile.sh
+
+set -o nounset
+set -o pipefail
+set -o errexit
+
+
+_OVM_PYTHON_OBJS='
+Python/_warnings.c
+Python/bltinmodule.c
+Python/ceval.c
+Python/errors.c
+Python/getargs.c
+Python/getcompiler.c
+Python/getplatform.c
+Python/getversion.c
+Python/import.c
+Python/marshal.c
+Python/modsupport.c
+Python/mystrtoul.c
+Python/mysnprintf.c
+Python/pyarena.c
+Python/pyctype.c
+Python/pyfpe.c
+Python/pystate.c
+Python/pythonrun.c
+Python/random.c
+Python/structmember.c
+Python/sysmodule.c
+Python/traceback.c
+Python/pystrtod.c
+Python/dtoa.c
+Python/pymath.c
+'
+# NOTE: pystrtod.c needs some floating point functions in pymath.c
+
+_OBJECT_OBJS='
+Objects/abstract.c
+Objects/boolobject.c
+Objects/bufferobject.c
+Objects/bytes_methods.c
+Objects/capsule.c
+Objects/cellobject.c
+Objects/classobject.c
+Objects/cobject.c
+Objects/codeobject.c
+Objects/descrobject.c
+Objects/enumobject.c
+Objects/exceptions.c
+Objects/genobject.c
+Objects/fileobject.c
+Objects/floatobject.c
+Objects/frameobject.c
+Objects/funcobject.c
+Objects/intobject.c
+Objects/iterobject.c
+Objects/listobject.c
+Objects/longobject.c
+Objects/dictobject.c
+Objects/methodobject.c
+Objects/moduleobject.c
+Objects/object.c
+Objects/obmalloc.c
+Objects/rangeobject.c
+Objects/setobject.c
+Objects/sliceobject.c
+Objects/stringobject.c
+Objects/structseq.c
+Objects/tupleobject.c
+Objects/typeobject.c
+Objects/weakrefobject.c
+'
+
+# Non-standard lib stuff.
+_MODULE_OBJS='
+Modules/gcmodule.c
+'
+
+# The stuff in Modules/Setup.dist, signalmodule.c.  NOTE: In Python,
+# signalmodule.c is specified in Modules/Setup.config, which comes from
+# 'configure' output.
+_MODOBJS='
+Modules/errnomodule.c
+Modules/_weakref.c
+Modules/zipimport.c
+Modules/signalmodule.c
+'
+
+# Parser/myreadline.c is needed for raw_input() to work.  There is a dependency
+# from Python/bltinmodule.c to it.
+_OVM_LIBRARY_OBJS="
+Modules/getbuildinfo.c
+Parser/myreadline.c
+$_OBJECT_OBJS
+$_OVM_PYTHON_OBJS
+$_MODULE_OBJS
+$_MODOBJS
+"
+
+demo() {
+  local abs_out=$PWD/_tmp/demo
+  local main=$PWD/demo/py_object_main.c
+
+  # From ./configure
+  #local PREFIX=/usr/local
+
+  # HAVE_READLINE defined in detected-config.sh.
+  source-detected-config-or-die
+
+
+  pushd $PY27
+
+  # Note: all this defines MAIN_NAME and so forth.
+  #
+  # We want to get rid of ALL modules I suppose.  Man that's a bunch of work.
+  # We're going to ONLY use objects.
+  #
+  # $abs_module_init \
+  # $abs_main_name \
+  # $c_module_src_list \
+
+  time $CC \
+    ${BASE_CFLAGS} \
+    ${CFLAGS} \
+    "${INCLUDE_PATHS[@]}" \
+    "${PREPROC_FLAGS[@]}" \
+    -D PREFIX="\"$PREFIX\"" \
+    -D EXEC_PREFIX="\"$PREFIX\"" \
+    -o $abs_out \
+    $_OVM_LIBRARY_OBJS \
+    $main \
+    -l m \
+    ${BASE_LDFLAGS} \
+    ${LDFLAGS} \
+    "$@" || true
+}
+
+# 35K lines of .c files, and 40K lines with headers
+# of course we have some other dependencies like math and string libs.
+source-files() {
+  egrep -v 'class|frame|set' <<EOF
+Objects/boolobject.c
+Objects/cellobject.c
+Objects/classobject.c
+Objects/cobject.c
+Objects/enumobject.c
+Objects/genobject.c
+Objects/fileobject.c
+Objects/floatobject.c
+Objects/frameobject.c
+Objects/funcobject.c
+Objects/iterobject.c
+Objects/listobject.c
+Objects/longobject.c
+Objects/dictobject.c
+Objects/methodobject.c
+Objects/moduleobject.c
+Objects/object.c
+Objects/rangeobject.c
+Objects/setobject.c
+Objects/sliceobject.c
+Objects/stringobject.c
+Objects/tupleobject.c
+Objects/typeobject.c
+EOF
+  #return
+
+  # These are mostly small
+  for f in Include/*object.h; do
+    echo $f
+  done
+}
+
+count() {
+  pushd $PY27
+  source-files | xargs wc -l | sort -n
+}
+
+"$@"

demo/py_object_main.c

@@ -0,0 +1,15 @@
+#include "Python.h"
+
+struct _inittab _PyImport_Inittab[] = {
+    /* Sentinel */
+    {0, 0}
+};
+
+
+int main(int argc, char **argv) {
+  // TODO:
+  // - Create all types
+  // - Create objects of each type
+  // - Perform operations on them
+	return 42;
+}