Allow hooks with arguments.

llvm-svn: 62685

1 files changed, 12 insertions, 7 deletions

diff --git a/llvm/tools/llvmc/doc/LLVMC-Reference.rst b/llvm/tools/llvmc/doc/LLVMC-Reference.rst
index d70b4a55988..9eb927c1658 100644
--- a/llvm/tools/llvmc/doc/LLVMC-Reference.rst
+++ b/llvm/tools/llvmc/doc/LLVMC-Reference.rst
@@ -560,16 +560,21 @@ Hooks and environment variables
 -------------------------------
 
 Normally, LLVMC executes programs from the system ``PATH``. Sometimes,
-this is not sufficient: for example, we may want to specify tool names
-in the configuration file. This can be achieved via the mechanism of
-hooks - to write your own hooks, just add their definitions to the
-``PluginMain.cpp`` or drop a ``.cpp`` file into the
-``$LLVMC_DIR/driver`` directory. Hooks should live in the ``hooks``
-namespace and have the signature ``std::string hooks::MyHookName
-(void)``. They can be used from the ``cmd_line`` tool property::
+this is not sufficient: for example, we may want to specify tool paths
+or names in the configuration file. This can be easily achieved via
+the hooks mechanism. To write your own hooks, just add their
+definitions to the ``PluginMain.cpp`` or drop a ``.cpp`` file into the
+your plugin directory. Hooks should live in the ``hooks`` namespace
+and have the signature ``const char* hooks::MyHookName ([const char*
+Arg0 [ const char* Arg2 [, ...]]])``. They can be used from the
+``cmd_line`` tool property::
 
     (cmd_line "$CALL(MyHook)/path/to/file -o $CALL(AnotherHook)")
 
+To pass arguments to hooks, use the following syntax::
+
+    (cmd_line "$CALL(MyHook, 'Arg1', 'Arg2', 'Arg # 3')/path/to/file -o1 -o2")
+
 It is also possible to use environment variables in the same manner::
 
    (cmd_line "$ENV(VAR1)/path/to/file -o $ENV(VAR2)")