Rearrange traceflags.py so that the file generation only happens if

the script is invoked as main.  This allows us to import traceflags.py
if we just want the list of available flags.
Embed traceflags.py into the zipfile so it can be accessed from the
python side of things.  With this, print an error on invalid flags and
add --trace-help option that will print out the list of trace flags
that are compiled in.  If a flag is prefixed with a '-', now that flag
will be disabled.

--HG--
extra : convert_revision : 2260a596b07d127c582ff73474dbbdb0583db524

src/python/SConscript

@@ -97,6 +97,7 @@ addPkg('m5')
 pyzip_files.append('m5/defines.py')
 pyzip_files.append('m5/info.py')
 pyzip_files.append(join(env['ROOT'], 'util/pbs/jobfile.py'))
+pyzip_files.append(join(env['ROOT'], 'src/base/traceflags.py'))
 
 def swig_it(basename):
     env.Command(['swig/%s_wrap.cc' % basename, 'm5/internal/%s.py' % basename],

src/python/m5/main.py

@@ -29,6 +29,7 @@
 import code, optparse, os, socket, sys
 from datetime import datetime
 from attrdict import attrdict
+import traceflags
 
 __all__ = [ 'options', 'arguments', 'main' ]
 
@@ -40,6 +41,19 @@ The Regents of The University of Michigan
 All Rights Reserved
 '''
 
+def print_list(items, indent=4):
+    line = ' ' * indent
+    for i,item in enumerate(items):
+        if len(line) + len(item) > 76:
+            print line
+            line = ' ' * indent
+
+        if i < len(items) - 1:
+            line += '%s, ' % item
+        else:
+            line += item
+            print line
+
 # there's only one option parsing done, so make it global and add some
 # helper functions to make it work well.
 parser = optparse.OptionParser(usage=usage, version=version,
@@ -135,8 +149,10 @@ add_option("--debug-break", metavar="TIME[,TIME]", action='append', split=',',
 
 # Tracing options
 set_group("Trace Options")
+add_option("--trace-help", action='store_true',
+    help="Print help on trace flags")
 add_option("--trace-flags", metavar="FLAG[,FLAG]", action='append', split=',',
-    help="Sets the flags for tracing")
+    help="Sets the flags for tracing (-FLAG disables a flag)")
 add_option("--trace-start", metavar="TIME", type='int',
     help="Start tracing at TIME (must be in ticks)")
 add_option("--trace-file", metavar="FILE", default="cout",
@@ -231,6 +247,19 @@ def main():
         print info.RELEASE_NOTES
         print
 
+    if options.trace_help:
+        done = True
+        print "Base Flags:"
+        print_list(traceflags.baseFlags, indent=4)
+        print
+        print "Compound Flags:"
+        for flag in traceflags.compoundFlags:
+            if flag == 'All':
+                continue
+            print "    %s:" % flag
+            print_list(traceflags.compoundFlagMap[flag], indent=8)
+            print
+
     if done:
         sys.exit(0)
 
@@ -250,6 +279,7 @@ def main():
     if not arguments or not os.path.isfile(arguments[0]):
         if arguments and not os.path.isfile(arguments[0]):
             print "Script %s not found" % arguments[0]
+
         usage(2)
 
     # tell C++ about output directory
@@ -267,9 +297,28 @@ def main():
     for when in options.debug_break:
         internal.debug.schedBreakCycle(int(when))
 
+    on_flags = []
+    off_flags = []
     for flag in options.trace_flags:
+        off = False
+        if flag.startswith('-'):
+            flag = flag[1:]
+            off = True
+        if flag not in traceflags.allFlags:
+            print >>sys.stderr, "invalid trace flag '%s'" % flag
+            sys.exit(1)
+
+        if off:
+            off_flags.append(flag)
+        else:
+            on_flags.append(flag)
+
+    for flag in on_flags:
         internal.trace.set(flag)
 
+    for flag in off_flags:
+        internal.trace.clear(flag)
+
     if options.trace_start is not None:
         internal.trace.enabled = False
         def enable_trace():