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-rwxr-xr-xsrc/scripts/ffi_decls.py89
1 files changed, 89 insertions, 0 deletions
diff --git a/src/scripts/ffi_decls.py b/src/scripts/ffi_decls.py
new file mode 100755
index 000000000..70bd8e2cf
--- /dev/null
+++ b/src/scripts/ffi_decls.py
@@ -0,0 +1,89 @@
+#!/usr/bin/python
+
+"""
+Automatically generate declarations for the FFI layer
+
+(C) 2019 Jack Lloyd
+
+Botan is released under the Simplified BSD License (see license.txt)
+"""
+
+from pycparser import c_parser, c_ast, parse_file
+
+ffi_header = 'src/lib/ffi/ffi.h'
+
+def to_ctype(typ, is_ptr):
+
+ if typ.startswith('botan_') and typ.endswith('_t'):
+ return 'c_void_p'
+
+ if is_ptr is False:
+ if typ == 'uint32':
+ return 'c_uint32'
+ elif typ == 'size_t':
+ return 'c_size_t'
+ elif typ == 'uint8_t':
+ return 'c_uint8'
+ elif typ == 'uint32_t':
+ return 'c_uint32'
+ elif typ == 'uint64_t':
+ return 'c_uint64'
+ elif typ == 'int':
+ return 'c_int'
+ elif typ == 'unsigned':
+ return 'c_uint'
+ else:
+ if typ == 'void':
+ return 'c_void_p'
+ elif typ in ['char']:
+ return 'c_char_p'
+ elif typ == 'size_t':
+ return 'POINTER(c_size_t)'
+ elif typ == 'uint8_t':
+ return 'POINTER(c_uint8)'
+ elif typ == 'uint32_t':
+ return 'POINTER(c_uint32)'
+ elif typ == 'uint64_t':
+ return 'POINTER(c_uint64)'
+ elif typ == 'int':
+ return 'POINTER(c_int)'
+
+ raise Exception("Unknown type %s/%d" % (typ, is_ptr))
+
+class FuncDefVisitor(c_ast.NodeVisitor):
+ def visit_FuncDecl(self, node):
+
+ if not isinstance(node.type, c_ast.TypeDecl):
+ #print("ignoring", node.type)
+ return
+
+ if node.type.type.names != ['int']:
+ #print("ignoring", node.type)
+ return
+
+ # all functions returning ints:
+ fn_name = node.type.declname
+
+ fn_args = [fn_name]
+
+ for param in node.args.params:
+
+ is_ptr = False
+ typ = None
+ if isinstance(param.type, c_ast.PtrDecl):
+ is_ptr = True
+ typ = param.type.type.type.names[0]
+ elif isinstance(param.type, c_ast.ArrayDecl):
+ is_ptr = True
+ typ = param.type.type.type.names[0]
+ else:
+ typ = param.type.type.names[0]
+
+ ctype = to_ctype(typ, is_ptr)
+ fn_args.append(ctype)
+
+ print(fn_args)
+
+ast = parse_file(ffi_header, use_cpp=True, cpp_args=['-Ibuild/include', '-std=c89', '-DBOTAN_DLL='])
+v = FuncDefVisitor()
+v.visit(ast)