error: Infrastructure to track locations for error reporting

New struct Location holds a location.  So far, the only location is
LOC_NONE, so this doesn't do anything useful yet.

Passing the current location all over the place would be too
cumbersome.  Hide it away in static cur_loc instead, and provide
accessors.  Print it in error_report().

Store it in QError, and print it in qerror_print().

Store it in QemuOpt, for use by qemu_opts_foreach().  This makes
error_report() do the right thing when it runs within
qemu_opts_foreach().

We may still have to store it in other data structures holding user
input for better error messages.  Left for another day.

1 files changed, 3 insertions, 1 deletions

diff --git a/qerror.h b/qerror.h
index ee59615bd2..f25be1b2cc 100644
--- a/qerror.h
+++ b/qerror.h
@@ -14,6 +14,7 @@
 
 #include "qdict.h"
 #include "qstring.h"
+#include "qemu-error.h"
 #include <stdarg.h>
 
 typedef struct QErrorStringTable {
@@ -24,6 +25,7 @@ typedef struct QErrorStringTable {
 typedef struct QError {
     QObject_HEAD;
     QDict *error;
+    Location loc;
     int linenr;
     const char *file;
     const char *func;
@@ -34,7 +36,7 @@ QError *qerror_new(void);
 QError *qerror_from_info(const char *file, int linenr, const char *func,
                          const char *fmt, va_list *va);
 QString *qerror_human(const QError *qerror);
-void qerror_print(const QError *qerror);
+void qerror_print(QError *qerror);
 QError *qobject_to_qerror(const QObject *obj);
 
 /*