Add support for accessing an MDNode's operands via the C binding. Pat…

…ch 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

@@ -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);
+
 /**
  * @}
  */

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)) {