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, 24 insertions, 0 deletions

diff --git a/qemu-tool.c b/qemu-tool.c
index 939049a9a1..97ca949964 100644
--- a/qemu-tool.c
+++ b/qemu-tool.c
@@ -104,6 +104,30 @@ int64_t qemu_get_clock(QEMUClock *clock)
     return (tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000)) / 1000000;
 }
 
+Location *loc_push_restore(Location *loc)
+{
+    return loc;
+}
+
+Location *loc_push_none(Location *loc)
+{
+    return loc;
+}
+
+Location *loc_pop(Location *loc)
+{
+    return loc;
+}
+
+Location *loc_save(Location *loc)
+{
+    return loc;
+}
+
+void loc_restore(Location *loc)
+{
+}
+
 void error_report(const char *fmt, ...)
 {
     va_list args;