gh-87092: expose the compiler's codegen to python for unit tests (GH-99111)

Include/internal/pycore_compile.h

@@ -40,6 +40,13 @@ extern int _PyAST_Optimize(
     _PyASTOptimizeState *state);
 
 /* Access compiler internals for unit testing */
+
+PyAPI_FUNC(PyObject*) _PyCompile_CodeGen(
+        PyObject *ast,
+        PyObject *filename,
+        PyCompilerFlags *flags,
+        int optimize);
+
 PyAPI_FUNC(PyObject*) _PyCompile_OptimizeCfg(
         PyObject *instructions,
         PyObject *consts);

Include/internal/pycore_global_objects_fini_generated.h

@@ -781,6 +781,7 @@ _PyStaticObjects_CheckRefcnt(PyInterpreterState *interp) {
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(arguments));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(argv));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(as_integer_ratio));
+    _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(ast));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(attribute));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(authorizer_callback));
     _PyStaticObject_CheckRefcnt((PyObject *)&_Py_ID(autocommit));

Include/internal/pycore_global_strings.h

@@ -267,6 +267,7 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(arguments)
         STRUCT_FOR_ID(argv)
         STRUCT_FOR_ID(as_integer_ratio)
+        STRUCT_FOR_ID(ast)
         STRUCT_FOR_ID(attribute)
         STRUCT_FOR_ID(authorizer_callback)
         STRUCT_FOR_ID(autocommit)

Include/internal/pycore_runtime_init_generated.h

@@ -773,6 +773,7 @@ extern "C" {
     INIT_ID(arguments), \
     INIT_ID(argv), \
     INIT_ID(as_integer_ratio), \
+    INIT_ID(ast), \
     INIT_ID(attribute), \
     INIT_ID(authorizer_callback), \
     INIT_ID(autocommit), \

Include/internal/pycore_unicodeobject_generated.h

@@ -440,6 +440,8 @@ _PyUnicode_InitStaticStrings(void) {
     PyUnicode_InternInPlace(&string);
     string = &_Py_ID(as_integer_ratio);
     PyUnicode_InternInPlace(&string);
+    string = &_Py_ID(ast);
+    PyUnicode_InternInPlace(&string);
     string = &_Py_ID(attribute);
     PyUnicode_InternInPlace(&string);
     string = &_Py_ID(authorizer_callback);

Lib/test/support/bytecode_helper.py

@@ -3,7 +3,7 @@
 import unittest
 import dis
 import io
-from _testinternalcapi import optimize_cfg
+from _testinternalcapi import compiler_codegen, optimize_cfg
 
 _UNSPECIFIED = object()
 
@@ -44,8 +44,7 @@ class BytecodeTestCase(unittest.TestCase):
                     msg = msg % (opname, argval, disassembly)
                     self.fail(msg)
 
-
-class CfgOptimizationTestCase(unittest.TestCase):
+class CompilationStepTestCase(unittest.TestCase):
 
     HAS_ARG = set(dis.hasarg)
     HAS_TARGET = set(dis.hasjrel + dis.hasjabs + dis.hasexc)
@@ -58,24 +57,35 @@ class CfgOptimizationTestCase(unittest.TestCase):
         self.last_label += 1
         return self.last_label
 
-    def complete_insts_info(self, insts):
-        # fill in omitted fields in location, and oparg 0 for ops with no arg.
-        instructions = []
-        for item in insts:
-            if isinstance(item, int):
-                instructions.append(item)
-            else:
-                assert isinstance(item, tuple)
-                inst = list(reversed(item))
-                opcode = dis.opmap[inst.pop()]
-                oparg = inst.pop() if opcode in self.HAS_ARG_OR_TARGET else 0
-                loc = inst + [-1] * (4 - len(inst))
-                instructions.append((opcode, oparg, *loc))
-        return instructions
+    def assertInstructionsMatch(self, actual_, expected_):
+        # get two lists where each entry is a label or
+        # an instruction tuple. Compare them, while mapping
+        # each actual label to a corresponding expected label
+        # based on their locations.
+
+        self.assertIsInstance(actual_, list)
+        self.assertIsInstance(expected_, list)
+
+        actual = self.normalize_insts(actual_)
+        expected = self.normalize_insts(expected_)
+        self.assertEqual(len(actual), len(expected))
+
+        # compare instructions
+        for act, exp in zip(actual, expected):
+            if isinstance(act, int):
+                self.assertEqual(exp, act)
+                continue
+            self.assertIsInstance(exp, tuple)
+            self.assertIsInstance(act, tuple)
+            # crop comparison to the provided expected values
+            if len(act) > len(exp):
+                act = act[:len(exp)]
+            self.assertEqual(exp, act)
 
     def normalize_insts(self, insts):
         """ Map labels to instruction index.
             Remove labels which are not used as jump targets.
+            Map opcodes to opnames.
         """
         labels_map = {}
         targets = set()
@@ -107,31 +117,32 @@ class CfgOptimizationTestCase(unittest.TestCase):
                 res.append((opcode, arg, *loc))
         return res
 
+
+class CodegenTestCase(CompilationStepTestCase):
+
+    def generate_code(self, ast):
+        insts = compiler_codegen(ast, "my_file.py", 0)
+        return insts
+
+
+class CfgOptimizationTestCase(CompilationStepTestCase):
+
+    def complete_insts_info(self, insts):
+        # fill in omitted fields in location, and oparg 0 for ops with no arg.
+        instructions = []
+        for item in insts:
+            if isinstance(item, int):
+                instructions.append(item)
+            else:
+                assert isinstance(item, tuple)
+                inst = list(reversed(item))
+                opcode = dis.opmap[inst.pop()]
+                oparg = inst.pop() if opcode in self.HAS_ARG_OR_TARGET else 0
+                loc = inst + [-1] * (4 - len(inst))
+                instructions.append((opcode, oparg, *loc))
+        return instructions
+
     def get_optimized(self, insts, consts):
         insts = self.complete_insts_info(insts)
         insts = optimize_cfg(insts, consts)
         return insts, consts
-
-    def compareInstructions(self, actual_, expected_):
-        # get two lists where each entry is a label or
-        # an instruction tuple. Compare them, while mapping
-        # each actual label to a corresponding expected label
-        # based on their locations.
-
-        self.assertIsInstance(actual_, list)
-        self.assertIsInstance(expected_, list)
-
-        actual = self.normalize_insts(actual_)
-        expected = self.normalize_insts(expected_)
-        self.assertEqual(len(actual), len(expected))
-
-        # compare instructions
-        for act, exp in zip(actual, expected):
-            if isinstance(act, int):
-                self.assertEqual(exp, act)
-                continue
-            self.assertIsInstance(exp, tuple)
-            self.assertIsInstance(act, tuple)
-            # pad exp with -1's (if location info is incomplete)
-            exp += (-1,) * (len(act) - len(exp))
-            self.assertEqual(exp, act)

Lib/test/test_compiler_codegen.py

@@ -0,0 +1,50 @@
+
+from test.support.bytecode_helper import CodegenTestCase
+
+# Tests for the code-generation stage of the compiler.
+# Examine the un-optimized code generated from the AST.
+
+class IsolatedCodeGenTests(CodegenTestCase):
+
+    def codegen_test(self, snippet, expected_insts):
+        import ast
+        a = ast.parse(snippet, "my_file.py", "exec");
+        insts = self.generate_code(a)
+        self.assertInstructionsMatch(insts, expected_insts)
+
+    def test_if_expression(self):
+        snippet = "42 if True else 24"
+        false_lbl = self.Label()
+        expected = [
+            ('RESUME', 0, 0),
+            ('LOAD_CONST', 0, 1),
+            ('POP_JUMP_IF_FALSE', false_lbl := self.Label(), 1),
+            ('LOAD_CONST', 1, 1),
+            ('JUMP', exit_lbl := self.Label()),
+            false_lbl,
+            ('LOAD_CONST', 2, 1),
+            exit_lbl,
+            ('POP_TOP', None),
+        ]
+        self.codegen_test(snippet, expected)
+
+    def test_for_loop(self):
+        snippet = "for x in l:\n\tprint(x)"
+        false_lbl = self.Label()
+        expected = [
+            ('RESUME', 0, 0),
+            ('LOAD_NAME', 0, 1),
+            ('GET_ITER', None, 1),
+            loop_lbl := self.Label(),
+            ('FOR_ITER', exit_lbl := self.Label(), 1),
+            ('STORE_NAME', None, 1),
+            ('PUSH_NULL', None, 2),
+            ('LOAD_NAME', None, 2),
+            ('LOAD_NAME', None, 2),
+            ('CALL', None, 2),
+            ('POP_TOP', None),
+            ('JUMP', loop_lbl),
+            exit_lbl,
+            ('END_FOR', None),
+        ]
+        self.codegen_test(snippet, expected)

Lib/test/test_peepholer.py

@@ -984,7 +984,7 @@ class DirectiCfgOptimizerTests(CfgOptimizationTestCase):
         if expected_consts is None:
             expected_consts = consts
         opt_insts, opt_consts = self.get_optimized(insts, consts)
-        self.compareInstructions(opt_insts, expected_insts)
+        self.assertInstructionsMatch(opt_insts, expected_insts)
         self.assertEqual(opt_consts, expected_consts)
 
     def test_conditional_jump_forward_non_const_condition(self):

Modules/_testinternalcapi.c

@@ -14,7 +14,7 @@
 #include "Python.h"
 #include "pycore_atomic_funcs.h" // _Py_atomic_int_get()
 #include "pycore_bitutils.h"     // _Py_bswap32()
-#include "pycore_compile.h"      // _PyCompile_OptimizeCfg()
+#include "pycore_compile.h"      // _PyCompile_CodeGen, _PyCompile_OptimizeCfg
 #include "pycore_fileutils.h"    // _Py_normpath
 #include "pycore_frame.h"        // _PyInterpreterFrame
 #include "pycore_gc.h"           // PyGC_Head
@@ -529,6 +529,26 @@ set_eval_frame_record(PyObject *self, PyObject *list)
     Py_RETURN_NONE;
 }
 
+/*[clinic input]
+
+_testinternalcapi.compiler_codegen -> object
+
+  ast: object
+  filename: object
+  optimize: int
+
+Apply compiler code generation to an AST.
+[clinic start generated code]*/
+
+static PyObject *
+_testinternalcapi_compiler_codegen_impl(PyObject *module, PyObject *ast,
+                                        PyObject *filename, int optimize)
+/*[clinic end generated code: output=fbbbbfb34700c804 input=e9fbe6562f7f75e4]*/
+{
+    PyCompilerFlags *flags = NULL;
+    return _PyCompile_CodeGen(ast, filename, flags, optimize);
+}
+
 
 /*[clinic input]
 
@@ -612,6 +632,7 @@ static PyMethodDef TestMethods[] = {
     {"DecodeLocaleEx", decode_locale_ex, METH_VARARGS},
     {"set_eval_frame_default", set_eval_frame_default, METH_NOARGS, NULL},
     {"set_eval_frame_record", set_eval_frame_record, METH_O, NULL},
+    _TESTINTERNALCAPI_COMPILER_CODEGEN_METHODDEF
     _TESTINTERNALCAPI_OPTIMIZE_CFG_METHODDEF
     {"get_interp_settings", get_interp_settings, METH_VARARGS, NULL},
     {NULL, NULL} /* sentinel */

Modules/clinic/_testinternalcapi.c.h

@@ -8,6 +8,69 @@ preserve
 #endif
 
 
+PyDoc_STRVAR(_testinternalcapi_compiler_codegen__doc__,
+"compiler_codegen($module, /, ast, filename, optimize)\n"
+"--\n"
+"\n"
+"Apply compiler code generation to an AST.");
+
+#define _TESTINTERNALCAPI_COMPILER_CODEGEN_METHODDEF    \
+    {"compiler_codegen", _PyCFunction_CAST(_testinternalcapi_compiler_codegen), METH_FASTCALL|METH_KEYWORDS, _testinternalcapi_compiler_codegen__doc__},
+
+static PyObject *
+_testinternalcapi_compiler_codegen_impl(PyObject *module, PyObject *ast,
+                                        PyObject *filename, int optimize);
+
+static PyObject *
+_testinternalcapi_compiler_codegen(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *return_value = NULL;
+    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+
+    #define NUM_KEYWORDS 3
+    static struct {
+        PyGC_Head _this_is_not_used;
+        PyObject_VAR_HEAD
+        PyObject *ob_item[NUM_KEYWORDS];
+    } _kwtuple = {
+        .ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)
+        .ob_item = { &_Py_ID(ast), &_Py_ID(filename), &_Py_ID(optimize), },
+    };
+    #undef NUM_KEYWORDS
+    #define KWTUPLE (&_kwtuple.ob_base.ob_base)
+
+    #else  // !Py_BUILD_CORE
+    #  define KWTUPLE NULL
+    #endif  // !Py_BUILD_CORE
+
+    static const char * const _keywords[] = {"ast", "filename", "optimize", NULL};
+    static _PyArg_Parser _parser = {
+        .keywords = _keywords,
+        .fname = "compiler_codegen",
+        .kwtuple = KWTUPLE,
+    };
+    #undef KWTUPLE
+    PyObject *argsbuf[3];
+    PyObject *ast;
+    PyObject *filename;
+    int optimize;
+
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 3, 3, 0, argsbuf);
+    if (!args) {
+        goto exit;
+    }
+    ast = args[0];
+    filename = args[1];
+    optimize = _PyLong_AsInt(args[2]);
+    if (optimize == -1 && PyErr_Occurred()) {
+        goto exit;
+    }
+    return_value = _testinternalcapi_compiler_codegen_impl(module, ast, filename, optimize);
+
+exit:
+    return return_value;
+}
+
 PyDoc_STRVAR(_testinternalcapi_optimize_cfg__doc__,
 "optimize_cfg($module, /, instructions, consts)\n"
 "--\n"
@@ -65,4 +128,4 @@ _testinternalcapi_optimize_cfg(PyObject *module, PyObject *const *args, Py_ssize
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=3b1fd713290f68a9 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=efe95836482fd542 input=a9049054013a1b77]*/

Python/compile.c

@@ -122,7 +122,7 @@
          (opcode) == STORE_FAST__STORE_FAST)
 
 #define IS_TOP_LEVEL_AWAIT(c) ( \
-        (c->c_flags->cf_flags & PyCF_ALLOW_TOP_LEVEL_AWAIT) \
+        (c->c_flags.cf_flags & PyCF_ALLOW_TOP_LEVEL_AWAIT) \
         && (c->u->u_ste->ste_type == ModuleBlock))
 
 typedef _PyCompilerSrcLocation location;
@@ -418,7 +418,7 @@ struct compiler {
     PyObject *c_filename;
     struct symtable *c_st;
     PyFutureFeatures c_future;   /* module's __future__ */
-    PyCompilerFlags *c_flags;
+    PyCompilerFlags c_flags;
 
     int c_optimize;              /* optimization level */
     int c_interactive;           /* true if in interactive mode */
@@ -583,11 +583,11 @@ _Py_Mangle(PyObject *privateobj, PyObject *ident)
     return result;
 }
 
-static int
-compiler_init(struct compiler *c)
-{
-    memset(c, 0, sizeof(struct compiler));
 
+static int
+compiler_setup(struct compiler *c, mod_ty mod, PyObject *filename,
+               PyCompilerFlags flags, int optimize, PyArena *arena)
+{
     c->c_const_cache = PyDict_New();
     if (!c->c_const_cache) {
         return 0;
@@ -595,57 +595,65 @@ compiler_init(struct compiler *c)
 
     c->c_stack = PyList_New(0);
     if (!c->c_stack) {
-        Py_CLEAR(c->c_const_cache);
         return 0;
     }
 
-    return 1;
-}
-
-PyCodeObject *
-_PyAST_Compile(mod_ty mod, PyObject *filename, PyCompilerFlags *flags,
-               int optimize, PyArena *arena)
-{
-    struct compiler c;
-    PyCodeObject *co = NULL;
-    PyCompilerFlags local_flags = _PyCompilerFlags_INIT;
-    int merged;
-    if (!compiler_init(&c))
-        return NULL;
-    c.c_filename = Py_NewRef(filename);
-    c.c_arena = arena;
-    if (!_PyFuture_FromAST(mod, filename, &c.c_future)) {
-        goto finally;
+    c->c_filename = Py_NewRef(filename);
+    c->c_arena = arena;
+    if (!_PyFuture_FromAST(mod, filename, &c->c_future)) {
+        return 0;
     }
-    if (!flags) {
-        flags = &local_flags;
-    }
-    merged = c.c_future.ff_features | flags->cf_flags;
-    c.c_future.ff_features = merged;
-    flags->cf_flags = merged;
-    c.c_flags = flags;
-    c.c_optimize = (optimize == -1) ? _Py_GetConfig()->optimization_level : optimize;
-    c.c_nestlevel = 0;
+    int merged = c->c_future.ff_features | flags.cf_flags;
+    c->c_future.ff_features = merged;
+    flags.cf_flags = merged;
+    c->c_flags = flags;
+    c->c_optimize = (optimize == -1) ? _Py_GetConfig()->optimization_level : optimize;
+    c->c_nestlevel = 0;
 
     _PyASTOptimizeState state;
-    state.optimize = c.c_optimize;
+    state.optimize = c->c_optimize;
     state.ff_features = merged;
 
     if (!_PyAST_Optimize(mod, arena, &state)) {
-        goto finally;
+        return 0;
     }
-
-    c.c_st = _PySymtable_Build(mod, filename, &c.c_future);
-    if (c.c_st == NULL) {
-        if (!PyErr_Occurred())
+    c->c_st = _PySymtable_Build(mod, filename, &c->c_future);
+    if (c->c_st == NULL) {
+        if (!PyErr_Occurred()) {
             PyErr_SetString(PyExc_SystemError, "no symtable");
-        goto finally;
+        }
+        return 0;
+    }
+    return 1;
+}
+
+static struct compiler*
+new_compiler(mod_ty mod, PyObject *filename, PyCompilerFlags *pflags,
+             int optimize, PyArena *arena)
+{
+    PyCompilerFlags flags = pflags ? *pflags : _PyCompilerFlags_INIT;
+    struct compiler *c = PyMem_Calloc(1, sizeof(struct compiler));
+    if (c == NULL) {
+        return NULL;
+    }
+    if (!compiler_setup(c, mod, filename, flags, optimize, arena)) {
+        compiler_free(c);
+        return NULL;
+    }
+    return c;
+}
+
+PyCodeObject *
+_PyAST_Compile(mod_ty mod, PyObject *filename, PyCompilerFlags *pflags,
+               int optimize, PyArena *arena)
+{
+    struct compiler *c = new_compiler(mod, filename, pflags, optimize, arena);
+    if (c == NULL) {
+        return NULL;
     }
 
-    co = compiler_mod(&c, mod);
-
- finally:
-    compiler_free(&c);
+    PyCodeObject *co = compiler_mod(c, mod);
+    compiler_free(c);
     assert(co || PyErr_Occurred());
     return co;
 }
@@ -656,8 +664,9 @@ compiler_free(struct compiler *c)
     if (c->c_st)
         _PySymtable_Free(c->c_st);
     Py_XDECREF(c->c_filename);
-    Py_DECREF(c->c_const_cache);
-    Py_DECREF(c->c_stack);
+    Py_XDECREF(c->c_const_cache);
+    Py_XDECREF(c->c_stack);
+    PyMem_Free(c);
 }
 
 static PyObject *
@@ -2136,15 +2145,13 @@ compiler_body(struct compiler *c, location loc, asdl_stmt_seq *stmts)
     return 1;
 }
 
-static PyCodeObject *
-compiler_mod(struct compiler *c, mod_ty mod)
+static int
+compiler_codegen(struct compiler *c, mod_ty mod)
 {
-    PyCodeObject *co;
-    int addNone = 1;
     _Py_DECLARE_STR(anon_module, "<module>");
     if (!compiler_enter_scope(c, &_Py_STR(anon_module), COMPILER_SCOPE_MODULE,
                               mod, 1)) {
-        return NULL;
+        return 0;
     }
     location loc = LOCATION(1, 1, 0, 0);
     switch (mod->kind) {
@@ -2163,7 +2170,6 @@ compiler_mod(struct compiler *c, mod_ty mod)
         break;
     case Expression_kind:
         VISIT_IN_SCOPE(c, expr, mod->v.Expression.body);
-        addNone = 0;
         break;
     default:
         PyErr_Format(PyExc_SystemError,
@@ -2171,7 +2177,17 @@ compiler_mod(struct compiler *c, mod_ty mod)
                      mod->kind);
         return 0;
     }
-    co = assemble(c, addNone);
+    return 1;
+}
+
+static PyCodeObject *
+compiler_mod(struct compiler *c, mod_ty mod)
+{
+    int addNone = mod->kind != Expression_kind;
+    if (!compiler_codegen(c, mod)) {
+        return NULL;
+    }
+    PyCodeObject *co = assemble(c, addNone);
     compiler_exit_scope(c);
     return co;
 }
@@ -8229,7 +8245,7 @@ compute_code_flags(struct compiler *c)
     }
 
     /* (Only) inherit compilerflags in PyCF_MASK */
-    flags |= (c->c_flags->cf_flags & PyCF_MASK);
+    flags |= (c->c_flags.cf_flags & PyCF_MASK);
 
     if ((IS_TOP_LEVEL_AWAIT(c)) &&
          ste->ste_coroutine &&
@@ -9859,6 +9875,9 @@ duplicate_exits_without_lineno(cfg_builder *g)
 
 
 /* Access to compiler optimizations for unit tests.
+ *
+ * _PyCompile_CodeGen takes and AST, applies code-gen and
+ * returns the unoptimized CFG as an instruction list.
  *
  * _PyCompile_OptimizeCfg takes an instruction list, constructs
  * a CFG, optimizes it and converts back to an instruction list.
@@ -9954,7 +9973,9 @@ cfg_to_instructions(cfg_builder *g)
         for (int i = 0; i < b->b_iused; i++) {
             struct instr *instr = &b->b_instr[i];
             location loc = instr->i_loc;
-            int arg = HAS_TARGET(instr->i_opcode) ? instr->i_target->b_label : instr->i_oparg;
+            int arg = HAS_TARGET(instr->i_opcode) ?
+                      instr->i_target->b_label : instr->i_oparg;
+
             PyObject *inst_tuple = Py_BuildValue(
                 "(iiiiii)", instr->i_opcode, arg,
                 loc.lineno, loc.end_lineno,
@@ -9977,6 +9998,52 @@ error:
     return NULL;
 }
 
+PyObject *
+_PyCompile_CodeGen(PyObject *ast, PyObject *filename, PyCompilerFlags *pflags,
+                   int optimize)
+{
+    PyObject *res = NULL;
+
+    if (!PyAST_Check(ast)) {
+        PyErr_SetString(PyExc_TypeError, "expected an AST");
+        return NULL;
+    }
+
+    PyArena *arena = _PyArena_New();
+    if (arena == NULL) {
+        return NULL;
+    }
+
+    mod_ty mod = PyAST_obj2mod(ast, arena, 0 /* exec */);
+    if (mod == NULL || !_PyAST_Validate(mod)) {
+        _PyArena_Free(arena);
+        return NULL;
+    }
+
+    struct compiler *c = new_compiler(mod, filename, pflags, optimize, arena);
+    if (c == NULL) {
+        _PyArena_Free(arena);
+        return NULL;
+    }
+
+    if (!compiler_codegen(c, mod)) {
+        goto finally;
+    }
+
+    cfg_builder *g = CFG_BUILDER(c);
+
+    if (translate_jump_labels_to_targets(g->g_entryblock) < 0) {
+        goto finally;
+    }
+
+    res = cfg_to_instructions(g);
+
+finally:
+    compiler_exit_scope(c);
+    compiler_free(c);
+    _PyArena_Free(arena);
+    return res;
+}
 
 PyObject *
 _PyCompile_OptimizeCfg(PyObject *instructions, PyObject *consts)