1 files changed, 10 insertions, 6 deletions
diff --git a/llvm/tools/llvm-diff/DiffLog.cpp b/llvm/tools/llvm-diff/DiffLog.cpp
index 6484197521f2..d31a345d255c 100644
--- a/llvm/tools/llvm-diff/DiffLog.cpp
+++ b/llvm/tools/llvm-diff/DiffLog.cpp
@@ -24,18 +24,18 @@ LogBuilder::~LogBuilder() {
 StringRef LogBuilder::getFormat() const { return Format; }
 
 unsigned LogBuilder::getNumArguments() const { return Arguments.size(); }
-Value *LogBuilder::getArgument(unsigned I) const { return Arguments[I]; }
+const Value *LogBuilder::getArgument(unsigned I) const { return Arguments[I]; }
 
 DiffLogBuilder::~DiffLogBuilder() { consumer.logd(*this); }
 
-void DiffLogBuilder::addMatch(Instruction *L, Instruction *R) {
+void DiffLogBuilder::addMatch(const Instruction *L, const Instruction *R) {
   Diff.push_back(DiffRecord(L, R));
 }
-void DiffLogBuilder::addLeft(Instruction *L) {
+void DiffLogBuilder::addLeft(const Instruction *L) {
   // HACK: VS 2010 has a bug in the stdlib that requires this.
   Diff.push_back(DiffRecord(L, DiffRecord::second_type(nullptr)));
 }
-void DiffLogBuilder::addRight(Instruction *R) {
+void DiffLogBuilder::addRight(const Instruction *R) {
   // HACK: VS 2010 has a bug in the stdlib that requires this.
   Diff.push_back(DiffRecord(DiffRecord::first_type(nullptr), R));
 }
@@ -46,5 +46,9 @@ DiffChange DiffLogBuilder::getLineKind(unsigned I) const {
   return (Diff[I].first ? (Diff[I].second ? DC_match : DC_left)
                         : DC_right);
 }
-Instruction *DiffLogBuilder::getLeft(unsigned I) const { return Diff[I].first; }
-Instruction *DiffLogBuilder::getRight(unsigned I) const { return Diff[I].second; }
+const Instruction *DiffLogBuilder::getLeft(unsigned I) const {
+  return Diff[I].first;
+}
+const Instruction *DiffLogBuilder::getRight(unsigned I) const {
+  return Diff[I].second;
+}