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).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153157 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 43 insertions, 0 deletions

diff --git a/include/llvm-c/Transforms/IPO.h b/include/llvm-c/Transforms/IPO.h
index 710bebe598..448078012e 100644
--- a/include/llvm-c/Transforms/IPO.h
+++ b/include/llvm-c/Transforms/IPO.h
@@ -21,6 +21,13 @@
 extern "C" {
 #endif
 
+/**
+ * @defgroup LLVMCTransformsIPO Interprocedural transformations
+ * @ingroup LLVMCTransforms
+ *
+ * @{
+ */
+
 /** See llvm::createArgumentPromotionPass function. */
 void LLVMAddArgumentPromotionPass(LLVMPassManagerRef PM);
 
@@ -63,6 +70,10 @@ void LLVMAddStripDeadPrototypesPass(LLVMPassManagerRef PM);
 /** See llvm::createStripSymbolsPass function. */
 void LLVMAddStripSymbolsPass(LLVMPassManagerRef PM);
 
+/**
+ * @}
+ */
+
 #ifdef __cplusplus
 }
 #endif /* defined(__cplusplus) */
diff --git a/include/llvm-c/Transforms/PassManagerBuilder.h b/include/llvm-c/Transforms/PassManagerBuilder.h
index fa722c9587..cee6e5a0ee 100644
--- a/include/llvm-c/Transforms/PassManagerBuilder.h
+++ b/include/llvm-c/Transforms/PassManagerBuilder.h
@@ -23,6 +23,13 @@ typedef struct LLVMOpaquePassManagerBuilder *LLVMPassManagerBuilderRef;
 extern "C" {
 #endif
 
+/**
+ * @defgroup LLVMCTransformsPassManagerBuilder Pass manager builder
+ * @ingroup LLVMCTransforms
+ *
+ * @{
+ */
+
 /** See llvm::PassManagerBuilder. */
 LLVMPassManagerBuilderRef LLVMPassManagerBuilderCreate(void);
 void LLVMPassManagerBuilderDispose(LLVMPassManagerBuilderRef PMB);
@@ -73,6 +80,10 @@ void LLVMPassManagerBuilderPopulateLTOPassManager(LLVMPassManagerBuilderRef PMB,
                                                   bool Internalize,
                                                   bool RunInliner);
 
+/**
+ * @}
+ */
+
 #ifdef __cplusplus
 }
 
diff --git a/include/llvm-c/Transforms/Scalar.h b/include/llvm-c/Transforms/Scalar.h
index 6015ef90ee..a2c4d6116f 100644
--- a/include/llvm-c/Transforms/Scalar.h
+++ b/include/llvm-c/Transforms/Scalar.h
@@ -25,6 +25,13 @@
 extern "C" {
 #endif
 
+/**
+ * @defgroup LLVMCTransformsScalar Scalar transformations
+ * @ingroup LLVMCTransforms
+ *
+ * @{
+ */
+
 /** See llvm::createAggressiveDCEPass function. */
 void LLVMAddAggressiveDCEPass(LLVMPassManagerRef PM);
 
@@ -116,6 +123,9 @@ void LLVMAddTypeBasedAliasAnalysisPass(LLVMPassManagerRef PM);
 /** See llvm::createBasicAliasAnalysisPass function */
 void LLVMAddBasicAliasAnalysisPass(LLVMPassManagerRef PM);
 
+/**
+ * @}
+ */
 
 #ifdef __cplusplus
 }
diff --git a/include/llvm-c/Transforms/Vectorize.h b/include/llvm-c/Transforms/Vectorize.h
index ce92eaac0f..9e7c7540d7 100644
--- a/include/llvm-c/Transforms/Vectorize.h
+++ b/include/llvm-c/Transforms/Vectorize.h
@@ -26,9 +26,20 @@
 extern "C" {
 #endif
 
+/**
+ * @defgroup LLVMCTransformsVectorize Vectorization transformations
+ * @ingroup LLVMCTransforms
+ *
+ * @{
+ */
+
 /** See llvm::createBBVectorizePass function. */
 void LLVMAddBBVectorizePass(LLVMPassManagerRef PM);
 
+/**
+ * @}
+ */
+
 #ifdef __cplusplus
 }
 #endif /* defined(__cplusplus) */