struct Hello : public FunctionPass {
-This declares a "``Hello``" class that is a subclass of `FunctionPass
+This declares a "``Hello``" class that is a subclass of :ref:`FunctionPass
<writing-an-llvm-pass-FunctionPass>`. The different builtin pass subclasses
are described in detail :ref:`later <writing-an-llvm-pass-pass-classes>`, but
for now, know that ``FunctionPass`` operates on a function at a time.
-hello - Hello World Pass
-indvars - Induction Variable Simplification
-inline - Function Integration/Inlining
- -insert-edge-profiling - Insert instrumentation for edge profiling
...
The pass name gets added as the information string for your pass, giving some