Major speedups to @cython.compile by caching parsing information.

Cython/Build/Dependencies.py

@@ -7,6 +7,19 @@ from distutils.extension import Extension
 from Cython import Utils
 from Cython.Compiler.Main import Context, CompilationOptions, default_options
 
+def cached_function(f):
+    cache_name = '__%s_cache' % f.__name__
+    def wrapper(*args):
+        cache = getattr(f, cache_name, None)
+        if cache is None:
+            cache = {}
+            setattr(f, cache_name, cache)
+        if args in cache:
+            return cache[args]
+        res = cache[args] = f(*args)
+        return res
+    return wrapper
+
 def cached_method(f):
     cache_name = '__%s_cache' % f.__name__
     def wrapper(self, *args):

Cython/Build/Inline.py

@@ -14,7 +14,7 @@ from Cython.Compiler.Main import Context, CompilationOptions, default_options
 
 from Cython.Compiler.ParseTreeTransforms import CythonTransform, SkipDeclarations, AnalyseDeclarationsTransform
 from Cython.Compiler.TreeFragment import parse_from_strings
-from Cython.Build.Dependencies import strip_string_literals, cythonize
+from Cython.Build.Dependencies import strip_string_literals, cythonize, cached_function
 from Cython.Compiler import Pipeline
 import cython as cython_module
 
@@ -38,6 +38,7 @@ class AllSymbols(CythonTransform, SkipDeclarations):
     def visit_NameNode(self, node):
         self.names.add(node.name)
 
+@cached_function
 def unbound_symbols(code, context=None):
     code = to_unicode(code)
     if context is None:

Cython/Compiler/Main.py

@@ -65,9 +65,10 @@ class Context(object):
 
         import Builtin, CythonScope
         self.modules = {"__builtin__" : Builtin.builtin_scope}
-        cyscope = CythonScope.create_cython_scope(
+        if self.cython_scope is None:
+            Context.cython_scope = CythonScope.create_cython_scope(
                     self, create_testscope=create_testscope)
-        self.modules["cython"] = self.cython_scope = cyscope
+        self.modules["cython"] = self.cython_scope
         self.include_directories = include_directories
         self.future_directives = set()
         self.compiler_directives = compiler_directives