base: Add LOC to Loggers

Printing the line and the file that triggered a log
is useful for debugging.

Change-Id: I74e0637b2943049134bd3e9a4bc6cab3766591a9
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/42141
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/base/logging.hh

@@ -123,7 +123,12 @@ class Logger
     bool enabled;
 
     /** Generates the log message. By default it is sent to cerr. */
-    virtual void log(const Loc &loc, std::string s) { std::cerr << s; }
+    virtual void
+    log(const Loc &loc, std::string s)
+    {
+        std::cerr << loc.file << ":" << loc.line << ": " << s;
+    }
+
     virtual void exit() { /* Fall through to the abort in exit_helper. */ }
 
     const char *prefix;