From a5f2faff5cdd7ebf0bc9c3c12efa982dc55f882c Mon Sep 17 00:00:00 2001
From: Igor Laevsky <igmyrj@gmail.com>
Date: Tue, 5 May 2015 13:20:42 +0000
Subject: [PATCH] Emit comment for gc.relocate showing base and derived
 pointers in human readable form.

Differential Revision: http://reviews.llvm.org/D9326



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236497 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/IR/AsmWriter.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/lib/IR/AsmWriter.cpp b/lib/IR/AsmWriter.cpp
index 6dfb7fa6b0f..6b575212301 100644
--- a/lib/IR/AsmWriter.cpp
+++ b/lib/IR/AsmWriter.cpp
@@ -31,6 +31,7 @@
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/Operator.h"
+#include "llvm/IR/Statepoint.h"
 #include "llvm/IR/TypeFinder.h"
 #include "llvm/IR/UseListOrder.h"
 #include "llvm/IR/ValueSymbolTable.h"
@@ -2002,6 +2003,10 @@ private:
   // printInfoComment - Print a little comment after the instruction indicating
   // which slot it occupies.
   void printInfoComment(const Value &V);
+
+  // printGCRelocateComment - print comment after call to the gc.relocate
+  // intrinsic indicating base and derived pointer names.
+  void printGCRelocateComment(const Value &V);
 };
 } // namespace
 
@@ -2642,10 +2647,26 @@ void AssemblyWriter::printInstructionLine(const Instruction &I) {
   Out << '\n';
 }
 
+/// printGCRelocateComment - print comment after call to the gc.relocate
+/// intrinsic indicating base and derived pointer names.
+void AssemblyWriter::printGCRelocateComment(const Value &V) {
+  assert(isGCRelocate(&V));
+  GCRelocateOperands GCOps(cast<Instruction>(&V));
+
+  Out << " ; (";
+  writeOperand(GCOps.basePtr(), false);
+  Out << ", ";
+  writeOperand(GCOps.derivedPtr(), false);
+  Out << ")";
+}
+
 /// printInfoComment - Print a little comment after the instruction indicating
 /// which slot it occupies.
 ///
 void AssemblyWriter::printInfoComment(const Value &V) {
+  if (isGCRelocate(&V))
+    printGCRelocateComment(V);
+
   if (AnnotationWriter)
     AnnotationWriter->printInfoComment(V, Out);
 }