Organize LLVM C API docs into doxygen modules; add docs

This gives a lot of love to the docs for the C API. Like Clang's
documentation, the C API is now organized into a Doxygen "module"
(LLVMC). Each C header file is a child of the main module. Some modules
(like Core) have a hierarchy of there own. The produced documentation is
thus better organized (before everything was in one monolithic list).

This patch also includes a lot of new documentation for APIs in Core.h.
It doesn't document them all, but is better than none. Function docs are
missing @param and @return annotation, but the documentation body now
commonly provides help details (like the expected llvm::Value sub-type
to expect).

llvm-svn: 153157

1 files changed, 11 insertions, 0 deletions

diff --git a/llvm/include/llvm-c/LinkTimeOptimizer.h b/llvm/include/llvm-c/LinkTimeOptimizer.h
index fca394681c7..5338d3fc4c8 100644
--- a/llvm/include/llvm-c/LinkTimeOptimizer.h
+++ b/llvm/include/llvm-c/LinkTimeOptimizer.h
@@ -20,6 +20,13 @@
 extern "C" {
 #endif
 
+/**
+ * @defgroup LLVMCLinkTimeOptimizer Link Time Optimization
+ * @ingroup LLVMC
+ *
+ * @{
+ */
+
   /// This provides a dummy type for pointers to the LTO object.
   typedef void* llvm_lto_t;
 
@@ -51,6 +58,10 @@ extern "C" {
   extern llvm_lto_status_t llvm_optimize_modules
     (llvm_lto_t lto, const char* output_filename);
 
+/**
+ * @}
+ */
+
 #ifdef __cplusplus
 }
 #endif