[mypyc] Add missing header declaration for CPyStr_IsTrue (python#10440)

Also add test that will find things missing in headers, as long as they follow
our naming convention (CPy*).

Author: JukkaL

mypyc/lib-rt/CPy.h

@@ -390,6 +390,7 @@ PyObject *CPyStr_Append(PyObject *o1, PyObject *o2);
 PyObject *CPyStr_GetSlice(PyObject *obj, CPyTagged start, CPyTagged end);
 bool CPyStr_Startswith(PyObject *self, PyObject *subobj);
 bool CPyStr_Endswith(PyObject *self, PyObject *subobj);
+bool CPyStr_IsTrue(PyObject *obj);
 
 
 // Set operations

mypyc/test/test_cheader.py

@@ -0,0 +1,40 @@
+"""Test that C functions used in primitives are declared in a header such as CPy.h."""
+
+import glob
+import os
+import re
+import unittest
+
+from mypyc.primitives import registry
+from mypyc.primitives.registry import CFunctionDescription
+
+
+class TestHeaderInclusion(unittest.TestCase):
+    def test_primitives_included_in_header(self) -> None:
+        base_dir = os.path.join(os.path.dirname(__file__), '..', 'lib-rt')
+        with open(os.path.join(base_dir, 'CPy.h')) as f:
+            header = f.read()
+        with open(os.path.join(base_dir, 'pythonsupport.h')) as f:
+            header += f.read()
+
+        def check_name(name: str) -> None:
+            if name.startswith('CPy'):
+                assert re.search(r'\b{}\b'.format(name), header), (
+                    '"{}" is used in mypyc.primitives but not declared in CPy.h'.format(name))
+
+        for values in [registry.method_call_ops.values(),
+                       registry.function_ops.values(),
+                       registry.binary_ops.values(),
+                       registry.unary_ops.values()]:
+            for ops in values:
+                if isinstance(ops, CFunctionDescription):
+                    ops = [ops]
+                for op in ops:
+                    check_name(op.c_function_name)
+
+        primitives_path = os.path.join(os.path.dirname(__file__), '..', 'primitives')
+        for fnam in glob.glob('{}/*.py'.format(primitives_path)):
+            with open(fnam) as f:
+                content = f.read()
+            for name in re.findall(r'c_function_name=["\'](CPy[A-Z_a-z0-9]+)', content):
+                check_name(name)