[SILLocation] Mark this function as LLVM_NODISCARD to prevent misuses.

Davide Italiano · Davide Italiano · commit 216c382213c8 · 2018-05-25T16:34:07.000-07:00
diff --git a/include/swift/SIL/SILLocation.h b/include/swift/SIL/SILLocation.h
@@ -428,7 +428,7 @@ class SILLocation {
   static DebugLoc decode(SourceLoc Loc, const SourceManager &SM);
 
   /// Return the decoded debug location.
-  DebugLoc decodeDebugLoc(const SourceManager &SM) const {
+  LLVM_NODISCARD DebugLoc decodeDebugLoc(const SourceManager &SM) const {
     return isDebugInfoLoc() ? Loc.DebugInfoLoc
                             : decode(getDebugSourceLoc(), SM);
   }

Original file line number	Diff line number	Diff line change
`@@ -428,7 +428,7 @@ class SILLocation {`
`428`	`428`	`static DebugLoc decode(SourceLoc Loc, const SourceManager &SM);`
`429`	`429`
`430`	`430`	`/// Return the decoded debug location.`
`431`		`- DebugLoc decodeDebugLoc(const SourceManager &SM) const {`
	`431`	`+ LLVM_NODISCARD DebugLoc decodeDebugLoc(const SourceManager &SM) const {`
`432`	`432`	`return isDebugInfoLoc() ? Loc.DebugInfoLoc`
`433`	`433`	`: decode(getDebugSourceLoc(), SM);`
`434`	`434`	`}`