From f68aaa588a2e1eb7cef5a57d57dd7e86fd4b0c9a Mon Sep 17 00:00:00 2001
From: Kenneth Heafield <kenlm@kheafield.com>
Date: Thu, 7 Jul 2011 21:01:38 -0400
Subject: Exception update

---
 klm/util/exception.hh | 56 +++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 52 insertions(+), 4 deletions(-)

(limited to 'klm/util/exception.hh')

diff --git a/klm/util/exception.hh b/klm/util/exception.hh
index c6936914..81675a57 100644
--- a/klm/util/exception.hh
+++ b/klm/util/exception.hh
@@ -1,8 +1,6 @@
 #ifndef UTIL_EXCEPTION__
 #define UTIL_EXCEPTION__
 
-#include "util/string_piece.hh"
-
 #include <exception>
 #include <sstream>
 #include <string>
@@ -22,6 +20,14 @@ class Exception : public std::exception {
     // Not threadsafe, but probably doesn't matter.  FWIW, Boost's exception guidance implies that what() isn't threadsafe.  
     const char *what() const throw();
 
+    // For use by the UTIL_THROW macros.  
+    void SetLocation(
+        const char *file,
+        unsigned int line,
+        const char *func,
+        const char *child_name,
+        const char *condition);
+
   private:
     template <class Except, class Data> friend typename Except::template ExceptionTag<Except&>::Identity operator<<(Except &e, const Data &data);
 
@@ -43,7 +49,49 @@ template <class Except, class Data> typename Except::template ExceptionTag<Excep
   return e;
 }
 
-#define UTIL_THROW(Exception, Modify) { Exception UTIL_e; {UTIL_e << Modify;} throw UTIL_e; }
+#ifdef __GNUC__
+#define UTIL_FUNC_NAME __PRETTY_FUNCTION__
+#else
+#ifdef _WIN32
+#define UTIL_FUNC_NAME __FUNCTION__
+#else
+#define UTIL_FUNC_NAME NULL
+#endif
+#endif
+
+#define UTIL_SET_LOCATION(UTIL_e, child, condition) do { \
+  (UTIL_e).SetLocation(__FILE__, __LINE__, UTIL_FUNC_NAME, (child), (condition)); \
+} while (0)
+
+/* Create an instance of Exception, add the message Modify, and throw it.
+ * Modify is appended to the what() message and can contain << for ostream
+ * operations.  
+ *
+ * do .. while kludge to swallow trailing ; character
+ * http://gcc.gnu.org/onlinedocs/cpp/Swallowing-the-Semicolon.html .  
+ */
+#define UTIL_THROW(Exception, Modify) do { \
+  Exception UTIL_e; \
+  UTIL_SET_LOCATION(UTIL_e, #Exception, NULL); \
+  UTIL_e << Modify; \
+  throw UTIL_e; \
+} while (0)
+
+#define UTIL_THROW_VAR(Var, Modify) do { \
+  Exception &UTIL_e = (Var); \
+  UTIL_SET_LOCATION(UTIL_e, NULL, NULL); \
+  UTIL_e << Modify; \
+  throw UTIL_e; \
+} while (0)
+
+#define UTIL_THROW_IF(Condition, Exception, Modify) do { \
+  if (Condition) { \
+    Exception UTIL_e; \
+    UTIL_SET_LOCATION(UTIL_e, #Exception, #Condition); \
+    UTIL_e << Modify; \
+    throw UTIL_e; \
+  } \
+} while (0)
 
 class ErrnoException : public Exception {
   public:
@@ -51,7 +99,7 @@ class ErrnoException : public Exception {
 
     virtual ~ErrnoException() throw();
 
-    int Error() { return errno_; }
+    int Error() const throw() { return errno_; }
 
   private:
     int errno_;
-- 
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