Generate C++ entry points (#925)

examples/dl-activations/relu3.py

@@ -64,13 +64,14 @@ def vrelu3_embedded_ks_checkpointed_map():
 
 
 embedded_cpp_entry_points = """
-namespace ks {
+#include "knossos-entry-points.h"
-ks::tensor<1, ks::Float> entry(ks::allocator * $alloc, ks::tensor<1, ks::Float> t) {
+
-    return ks::vrelu3($alloc, t);
+ks::tensor<1, ks::Float> entry(ks::tensor<1, ks::Float> t) {
-}
+    return ks::vrelu3(&ks::entry_points::g_alloc, t);
-ks::tensor<1, ks::Float> entry_vjp(ks::allocator * $alloc, ks::tensor<1, ks::Float> t, ks::tensor<1, ks::Float> dret) {
-    return ks::sufrev_vrelu3($alloc, t, dret);
 }
+
+ks::tensor<1, ks::Float> entry_vjp(ks::tensor<1, ks::Float> t, ks::tensor<1, ks::Float> dret) {
+    return ks::sufrev_vrelu3(&ks::entry_points::g_alloc, t, dret);
 }
 """
 

src/python/ksc/cgen.py

@@ -0,0 +1,84 @@
+from ksc import utils
+
+
+scalar_type_to_cpp_map = {
+    "Integer": "ks::Integer",
+    "Float": "ks::Float",
+    "Bool": "ks::Bool",
+    "String": "std::string",
+}
+
+
+def ks_cpp_type(t):
+    if t.is_scalar:
+        return scalar_type_to_cpp_map[t.kind]
+    elif t.is_tuple:
+        return (
+            "ks::Tuple<"
+            + ", ".join(ks_cpp_type(child) for child in t.tuple_elems())
+            + ">"
+        )
+    elif t.is_tensor:
+        return f"ks::tensor<{t.tensor_rank}, {ks_cpp_type(t.tensor_elem_type)}>"
+    else:
+        raise ValueError(f'Unable to generate C++ type for "{t}"')
+
+
+def generate_cpp_entry_points(bindings_to_generate, decls):
+    decls_by_name = {decl.name: decl for decl in decls}
+
+    def lookup_decl(structured_name):
+        if structured_name not in decls_by_name:
+            raise ValueError(f"No ks definition found for binding: {structured_name}")
+        return decls_by_name[structured_name]
+
+    cpp_entry_points = "".join(
+        generate_cpp_entry_point(binding_name, lookup_decl(structured_name))
+        for binding_name, structured_name in bindings_to_generate
+    )
+
+    return f"""
+#include "knossos-entry-points.h"
+
+namespace ks {{
+namespace entry_points {{
+namespace generated {{
+{cpp_entry_points}
+}}
+}}
+}}
+"""
+
+
+def generate_cpp_entry_point(cpp_function_name, decl):
+    return_type = decl.return_type
+    arg_types = [arg.type_ for arg in decl.args]
+    if len(arg_types) == 1 and arg_types[0].is_tuple:
+        arg_types = arg_types[0].children
+
+    def arg_name(i):
+        return f"arg{i}"
+
+    args = ", ".join(
+        f"{ks_cpp_type(arg_type)} {arg_name(i)}" for i, arg_type in enumerate(arg_types)
+    )
+    cpp_declaration = f"{ks_cpp_type(return_type)} {cpp_function_name}({args})"
+
+    ks_function_name = utils.encode_name(decl.name.mangled())
+    arg_names = [arg_name(i) for i in range(len(arg_types))]
+    arg_list = ", ".join(["&g_alloc"] + arg_names)
+    cpp_call = f"ks::{ks_function_name}({arg_list})"
+    args_streamed = ' << ", " '.join(f" << {arg}" for arg in arg_names)
+
+    return f"""
+{cpp_declaration} {{
+    if (g_logging) {{
+        std::cerr << "{ks_function_name}("{args_streamed} << ") =" << std::endl;
+        auto ret = {cpp_call};
+        std::cerr << ret << std::endl;
+        return ret;
+    }} else {{
+        return {cpp_call};
+    }}
+}}
+"""

src/python/ksc/compile.py

@@ -8,7 +8,8 @@ from tempfile import gettempdir
 
 from torch.utils import cpp_extension
 
-from ksc import utils
+from ksc import cgen, utils
+from ksc.parse_ks import parse_ks_filename
 
 preserve_temporary_files = False
 
@@ -52,6 +53,7 @@ def generate_cpp_from_ks(ks_str, use_aten=False):
         e = subprocess.run(ksc_command, capture_output=True, check=True,)
         print(e.stdout.decode("ascii"))
         print(e.stderr.decode("ascii"))
+        decls = list(parse_ks_filename(fkso.name))
     except subprocess.CalledProcessError as e:
         print(f"Command failed:\n{' '.join(ksc_command)}")
         print(f"files {fks.name} {fkso.name} {fcpp.name}")
@@ -62,7 +64,7 @@ def generate_cpp_from_ks(ks_str, use_aten=False):
 
     # Read from CPP back to string
     with open(fcpp.name) as f:
-        out = f.read()
+        generated_cpp = f.read()
 
     # only delete these file if no error
     if not preserve_temporary_files:
@@ -79,7 +81,7 @@ def generate_cpp_from_ks(ks_str, use_aten=False):
             os.unlink(fcpp.name)
             os.unlink(fkso.name)
 
-    return out
+    return generated_cpp, decls
 
 
 def build_py_module_from_cpp(cpp_str, profiling=False, use_aten=False):
@@ -156,22 +158,23 @@ def generate_cpp_for_py_module_from_ks(
         return structured_name.mangled()
 
     bindings = [
-        (python_name, utils.encode_name(mangled_with_type(structured_name)))
+        (python_name, "ks::entry_points::generated::" + python_name)
-        for (python_name, structured_name) in bindings_to_generate
+        for (python_name, _) in bindings_to_generate
     ]
 
-    cpp_ks_functions = generate_cpp_from_ks(ks_str, use_aten=use_aten)
+    cpp_ks_functions, decls = generate_cpp_from_ks(ks_str, use_aten=use_aten)
+    cpp_entry_points = cgen.generate_cpp_entry_points(bindings_to_generate, decls)
     cpp_pybind_module_declaration = generate_cpp_pybind_module_declaration(
         bindings, python_module_name
     )
 
-    return cpp_ks_functions + cpp_pybind_module_declaration
+    return cpp_ks_functions + cpp_entry_points + cpp_pybind_module_declaration
 
 
 def generate_cpp_pybind_module_declaration(bindings_to_generate, python_module_name):
     def m_def(python_name, cpp_name):
         return f"""
-        m.def("{python_name}", ks::entry_points::with_ks_allocator("{cpp_name}", &ks::{cpp_name}));
+        m.def("{python_name}", &{cpp_name});
         """
 
     return (