After converting assert(0) to LLVM_UNREACHABLE we lost file/line location.

Fix by making the LLVM_UNREACHABLE pass __FILE__ and __LINE__ to
llvm_unreachable.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75631 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 12 insertions, 4 deletions

diff --git a/include/llvm/Support/ErrorHandling.h b/include/llvm/Support/ErrorHandling.h
index 07faba7..c14eed9 100644
--- a/include/llvm/Support/ErrorHandling.h
+++ b/include/llvm/Support/ErrorHandling.h
@@ -49,11 +49,15 @@ namespace llvm {
   /// This function calls abort(), and prints the optional message to stderr.
   /// Call this instead of assert(0), so that compiler knows the path is not
   /// reachable even for NDEBUG builds.
-  void llvm_unreachable(const char *msg=0) NORETURN;
+  /// Use the LLVM_UNREACHABLE macro instead that adds location info.
+  void llvm_unreachable(const char *msg=0, const char *file=0,
+                        unsigned line=0) NORETURN;
 }
 
+/// Macro that calls llvm_unreachable with location info and message in 
+/// debug mode. In NDEBUG mode it calls llvm_unreachable with no message.
 #ifndef NDEBUG
-#define LLVM_UNREACHABLE(msg) llvm_unreachable(msg)
+#define LLVM_UNREACHABLE(msg) llvm_unreachable(msg, __FILE__, __LINE__)
 #else
 #define LLVM_UNREACHABLE(msg) llvm_unreachable()
 #endif
diff --git a/include/llvm/Support/PassNameParser.h b/include/llvm/Support/PassNameParser.h
index 12c1240..559dfd3 100644
--- a/include/llvm/Support/PassNameParser.h
+++ b/include/llvm/Support/PassNameParser.h
@@ -68,7 +68,7 @@ public:
     if (findOption(P->getPassArgument()) != getNumOptions()) {
       cerr << "Two passes with the same argument (-"
            << P->getPassArgument() << ") attempted to be registered!\n";
-      llvm_unreachable();
+      LLVM_UNREACHABLE(0);
     }
     addLiteralOption(P->getPassArgument(), P, P->getPassName());
   }
diff --git a/lib/Support/ErrorHandling.cpp b/lib/Support/ErrorHandling.cpp
index f2e247c..be0b380 100644
--- a/lib/Support/ErrorHandling.cpp
+++ b/lib/Support/ErrorHandling.cpp
@@ -44,9 +44,13 @@ void llvm_report_error(const std::string &reason) {
   exit(1);
 }
 
-void llvm_unreachable(const char *msg) {
+void llvm_unreachable(const char *msg, const char *file, unsigned line) {
   if (msg)
     errs() << msg << "\n";
+  errs() << "UNREACHABLE executed";
+  if (file)
+    errs() << " at " << file << ":" << line;
+  errs() << "!\n";
   abort();
 }
 }