[llvm-c] Implement LLVMPrintValueToString

Original patch by Chris Wailes

llvm-svn: 194135

llvm/include/llvm-c/Core.h

@@ -1211,6 +1211,14 @@ void LLVMSetValueName(LLVMValueRef Val, const char *Name);
  */
 void LLVMDumpValue(LLVMValueRef Val);
 
+/**
+ * Return a string representation of the value. Use
+ * LLVMDisposeMessage to free the string.
+ *
+ * @see llvm::Value::print()
+ */
+char *LLVMPrintValueToString(LLVMValueRef Val);
+
 /**
  * Replace all uses of a value with another one.
  *

llvm/lib/IR/Core.cpp

@@ -474,6 +474,16 @@ void LLVMDumpValue(LLVMValueRef Val) {
   unwrap(Val)->dump();
 }
 
+char* LLVMPrintValueToString(LLVMValueRef Val) {
+  std::string buf;
+  raw_string_ostream os(buf);
+
+  unwrap(Val)->print(os);
+  os.flush();
+
+  return strdup(buf.c_str());
+}
+
 void LLVMReplaceAllUsesWith(LLVMValueRef OldVal, LLVMValueRef NewVal) {
   unwrap(OldVal)->replaceAllUsesWith(unwrap(NewVal));
 }