statprof: pass data structure to display functions

statprof: pass data structure to display functions

Currently, statprof maintains a global "state" variable that is used by
several functions. Global variables hinder adaptability of code.
So pass state to display functions so we can make changes to how
"state" works in future patches.

--- a/mercurial/statprof.py	Sun Aug 14 19:20:12 2016 -0700
+++ b/mercurial/statprof.py	Tue Nov 01 19:03:11 2016 -0700
@@ -427,40 +427,41 @@
     FlameGraph = 4
     Json = 5
 
-def display(fp=None, format=3, **kwargs):
+def display(fp=None, format=3, data=None, **kwargs):
     '''Print statistics, either to stdout or the given file object.'''
+    data = data or state
 
     if fp is None:
         import sys
         fp = sys.stdout
-    if len(state.samples) == 0:
+    if len(data.samples) == 0:
         print('No samples recorded.', file=fp)
         return
 
     if format == DisplayFormats.ByLine:
-        display_by_line(fp)
+        display_by_line(data, fp)
     elif format == DisplayFormats.ByMethod:
-        display_by_method(fp)
+        display_by_method(data, fp)
     elif format == DisplayFormats.AboutMethod:
-        display_about_method(fp, **kwargs)
+        display_about_method(data, fp, **kwargs)
     elif format == DisplayFormats.Hotpath:
-        display_hotpath(fp, **kwargs)
+        display_hotpath(data, fp, **kwargs)
     elif format == DisplayFormats.FlameGraph:
-        write_to_flame(fp, **kwargs)
+        write_to_flame(data, fp, **kwargs)
     elif format == DisplayFormats.Json:
-        write_to_json(fp)
+        write_to_json(data, fp)
     else:
         raise Exception("Invalid display format")
 
     if format != DisplayFormats.Json:
         print('---', file=fp)
-        print('Sample count: %d' % len(state.samples), file=fp)
-        print('Total time: %f seconds' % state.accumulated_time, file=fp)
+        print('Sample count: %d' % len(data.samples), file=fp)
+        print('Total time: %f seconds' % data.accumulated_time, file=fp)
 
-def display_by_line(fp):
+def display_by_line(data, fp):
     '''Print the profiler data with each sample line represented
     as one row in a table.  Sorted by self-time per line.'''
-    stats = SiteStats.buildstats(state.samples)
+    stats = SiteStats.buildstats(data.samples)
     stats.sort(reverse=True, key=lambda x: x.selfseconds())
 
     print('%5.5s %10.10s   %7.7s  %-8.8s' %
@@ -477,7 +478,7 @@
                                          sitelabel),
               file=fp)
 
-def display_by_method(fp):
+def display_by_method(data, fp):
     '''Print the profiler data with each sample function represented
     as one row in a table.  Important lines within that function are
     output as nested rows.  Sorted by self-time per line.'''
@@ -486,7 +487,7 @@
     print('%5.5s  %9.9s  %8.8s  %-8.8s' %
           ("time", "seconds", "seconds", "name"), file=fp)
 
-    stats = SiteStats.buildstats(state.samples)
+    stats = SiteStats.buildstats(data.samples)
 
     grouped = defaultdict(list)
     for stat in stats:
@@ -530,7 +531,7 @@
 
                 print('%33.0f%% %6.2f   line %s: %s' % (stattuple), file=fp)
 
-def display_about_method(fp, function=None, **kwargs):
+def display_about_method(data, fp, function=None, **kwargs):
     if function is None:
         raise Exception("Invalid function")
 
@@ -542,7 +543,7 @@
     parents = {}
     children = {}
 
-    for sample in state.samples:
+    for sample in data.samples:
         for i, site in enumerate(sample.stack):
             if site.function == function and (not filename
                 or site.filename() == filename):
@@ -566,7 +567,7 @@
             (count / relevant_samples * 100, parent.filename(),
             parent.function, parent.lineno, parent.getsource(50)), file=fp)
 
-    stats = SiteStats.buildstats(state.samples)
+    stats = SiteStats.buildstats(data.samples)
     stats = [s for s in stats
                if s.site.function == function and
                (not filename or s.site.filename() == filename)]
@@ -599,7 +600,7 @@
               (count / relevant_samples * 100, child.lineno,
                child.getsource(50)), file=fp)
 
-def display_hotpath(fp, limit=0.05, **kwargs):
+def display_hotpath(data, fp, limit=0.05, **kwargs):
     class HotNode(object):
         def __init__(self, site):
             self.site = site
@@ -623,8 +624,8 @@
                     child.add(stack[i:], time)
 
     root = HotNode(None)
-    lasttime = state.samples[0].time
-    for sample in state.samples:
+    lasttime = data.samples[0].time
+    for sample in data.samples:
         root.add(sample.stack[::-1], sample.time - lasttime)
         lasttime = sample.time
 
@@ -671,7 +672,7 @@
     if root.count > 0:
         _write(root, 0, False)
 
-def write_to_flame(fp, scriptpath=None, outputfile=None, **kwargs):
+def write_to_flame(data, fp, scriptpath=None, outputfile=None, **kwargs):
     if scriptpath is None:
         scriptpath = os.environ['HOME'] + '/flamegraph.pl'
     if not os.path.exists(scriptpath):
@@ -685,7 +686,7 @@
     file = open(path, "w+")
 
     lines = {}
-    for sample in state.samples:
+    for sample in data.samples:
         sites = [s.function for s in sample.stack]
         sites.reverse()
         line = ';'.join(sites)
@@ -705,10 +706,10 @@
     os.system("perl ~/flamegraph.pl %s > %s" % (path, outputfile))
     print("Written to %s" % outputfile, file=fp)
 
-def write_to_json(fp):
+def write_to_json(data, fp):
     samples = []
 
-    for sample in state.samples:
+    for sample in data.samples:
         stack = []
 
         for frame in sample.stack: