diff --git a/docs/source/plugin-development/plugin-parameters.rst b/docs/source/plugin-development/plugin-parameters.rst
index 3c4534a..e341572 100644
--- a/docs/source/plugin-development/plugin-parameters.rst
+++ b/docs/source/plugin-development/plugin-parameters.rst
@@ -34,18 +34,27 @@ a file, a plugin can ask for any of the following:
 - :attr:`~flake8.processor.FileProcessor.indent_level`
 - :attr:`~flake8.processor.FileProcessor.line_number`
 - :attr:`~flake8.processor.FileProcessor.logical_line`
-- :attr:`~flake8.processor.FileProcessor.max_line_length`
 - :attr:`~flake8.processor.FileProcessor.multiline`
 - :attr:`~flake8.processor.FileProcessor.noqa`
 - :attr:`~flake8.processor.FileProcessor.previous_indent_level`
 - :attr:`~flake8.processor.FileProcessor.previous_logical`
 - :attr:`~flake8.processor.FileProcessor.tokens`
+
+Some properties are set once per file for plugins which iterate itself over
+the data instead of being called on each physical or logical line.
+
+- :attr:`~flake8.processor.FileProcessor.filename`
+- :attr:`~flake8.processor.FileProcessor.file_tokens`
+- :attr:`~flake8.processor.FileProcessor.lines`
+- :attr:`~flake8.processor.FileProcessor.max_line_length`
 - :attr:`~flake8.processor.FileProcessor.total_lines`
 - :attr:`~flake8.processor.FileProcessor.verbose`
 
-Alternatively, a plugin can accept ``tree`` and ``filename``.
-``tree`` will be a parsed abstract syntax tree that will be used by plugins
-like PyFlakes and McCabe.
+These parameters can also be supplied to plugins working on each line
+separately. Additionally, plugins called once per file can also accept ``tree``
+which is not supplied as a parameter of
+:class:`~flake8.processor.FileProcessor`, which will be a parsed abstract
+syntax tree. It is used by plugins like PyFlakes and McCabe.
 
 
 Registering Options
diff --git a/src/flake8/processor.py b/src/flake8/processor.py
index dee0b15..79844af 100644
--- a/src/flake8/processor.py
+++ b/src/flake8/processor.py
@@ -43,6 +43,7 @@ class FileProcessor(object):
     - :attr:`previous_indent_level`
     - :attr:`previous_logical`
     - :attr:`tokens`
+    - :attr:`file_tokens`
     - :attr:`total_lines`
     - :attr:`verbose`
     """
@@ -101,6 +102,19 @@ class FileProcessor(object):
         self.statistics = {
             'logical lines': 0,
         }
+        self._file_tokens = None
+
+    @property
+    def file_tokens(self):
+        if self._file_tokens is None:
+            line_iter = iter(self.lines)
+            try:
+                self._file_tokens = list(tokenize.generate_tokens(
+                    lambda: next(line_iter)))
+            except tokenize.TokenError as exc:
+                raise exceptions.InvalidSyntax(exc.message, exception=exc)
+
+        return self._file_tokens[:]
 
     @contextlib.contextmanager
     def inside_multiline(self, line_number):