From 4caf5281bf9cbdbc13758a6f2b965b0e9ef233d3 Mon Sep 17 00:00:00 2001
From: Duncan Sands <baldrick@free.fr>
Date: Wed, 19 Sep 2012 20:29:39 +0000
Subject: [PATCH] Add support for accessing an MDNode's operands via the C
 binding.  Patch by Anthony Bryant.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164247 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm-c/Core.h | 21 +++++++++++++++++++++
 lib/VMCore/Core.cpp   | 13 +++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/include/llvm-c/Core.h b/include/llvm-c/Core.h
index 6587e770800..4d3374958b5 100644
--- a/include/llvm-c/Core.h
+++ b/include/llvm-c/Core.h
@@ -1868,6 +1868,27 @@ LLVMValueRef LLVMMDNode(LLVMValueRef *Vals, unsigned Count);
  */
 const char  *LLVMGetMDString(LLVMValueRef V, unsigned* Len);
 
+/**
+ * Obtain the number of operands from an MDNode value.
+ *
+ * @param V MDNode to get number of operands from.
+ * @return Number of operands of the MDNode.
+ */
+unsigned LLVMGetMDNodeNumOperands(LLVMValueRef V);
+
+/**
+ * Obtain the given MDNode's operands.
+ *
+ * The passed LLVMValueRef pointer should point to enough memory to hold all of
+ * the operands of the given MDNode (see LLVMGetMDNodeNumOperands) as
+ * LLVMValueRefs. This memory will be populated with the LLVMValueRefs of the
+ * MDNode's operands.
+ *
+ * @param V MDNode to get the operands from.
+ * @param Dest Destination array for operands.
+ */
+void LLVMGetMDNodeOperands(LLVMValueRef V, LLVMValueRef *Dest);
+
 /**
  * @}
  */
diff --git a/lib/VMCore/Core.cpp b/lib/VMCore/Core.cpp
index a56f1b282ba..924367deef2 100644
--- a/lib/VMCore/Core.cpp
+++ b/lib/VMCore/Core.cpp
@@ -568,6 +568,19 @@ const char *LLVMGetMDString(LLVMValueRef V, unsigned* Len) {
   return 0;
 }
 
+unsigned LLVMGetMDNodeNumOperands(LLVMValueRef V)
+{
+  return cast<MDNode>(unwrap(V))->getNumOperands();
+}
+
+void LLVMGetMDNodeOperands(LLVMValueRef V, LLVMValueRef *Dest)
+{
+  const MDNode *N = cast<MDNode>(unwrap(V));
+  const unsigned numOperands = N->getNumOperands();
+  for (unsigned i = 0; i < numOperands; i++)
+    Dest[i] = wrap(N->getOperand(i));
+}
+
 unsigned LLVMGetNamedMetadataNumOperands(LLVMModuleRef M, const char* name)
 {
   if (NamedMDNode *N = unwrap(M)->getNamedMetadata(name)) {
-- 
2.34.1