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, 10 insertions, 0 deletions

diff --git a/llvm/include/llvm-c/lto.h b/llvm/include/llvm-c/lto.h
index 7ea7ad01a21..43ef9dcd643 100644
--- a/llvm/include/llvm-c/lto.h
+++ b/llvm/include/llvm-c/lto.h
@@ -20,6 +20,13 @@
 #include <stddef.h>
 #include <unistd.h>
 
+/**
+ * @defgroup LLVMCLTO LTO
+ * @ingroup LLVMC
+ *
+ * @{
+ */
+
 #define LTO_API_VERSION 4
 
 typedef enum {
@@ -289,5 +296,8 @@ lto_codegen_debug_options(lto_code_gen_t cg, const char *);
 }
 #endif
 
+/**
+ * @}
+ */
 
 #endif