814         id2stack.append(dict(category=stack[0][0], name='%s %s' % stack[0]))

   814         id2stack.append(dict(category=stack[0][0], name='%s %s' % stack[0]))

   815         if parent is not None:

   815         if parent is not None:

   816             id2stack[-1].update(parent=parent)

   816             id2stack[-1].update(parent=parent)

   817         return myid

   817         return myid

   818 

   818 

   822     # The sampling profiler can sample multiple times without

   819     # The sampling profiler can sample multiple times without

   823     # advancing the clock, potentially causing the Chrome trace viewer

   820     # advancing the clock, potentially causing the Chrome trace viewer

   824     # to render single-pixel columns that we cannot zoom in on.  We

   821     # to render single-pixel columns that we cannot zoom in on.  We

   825     # work around this by pretending that zero-duration samples are a

   822     # work around this by pretending that zero-duration samples are a

   826     # millisecond in length.

   823     # millisecond in length.

   856 

   853 

   857     # Much fiddling to synthesize correctly(ish) nested begin/end

   854     # Much fiddling to synthesize correctly(ish) nested begin/end

   858     # events given only stack snapshots.

   855     # events given only stack snapshots.

   859 

   856 

   860     for sample in data.samples:

   857     for sample in data.samples:

   864         stack = tuple((('%s:%d' % (simplifypath(frame.path), frame.lineno),

   858         stack = tuple((('%s:%d' % (simplifypath(frame.path), frame.lineno),

   865                         frame.function) for frame in sample.stack))

   859                         frame.function) for frame in sample.stack))

   866         qstack = collections.deque(stack)

   860         qstack = collections.deque(stack)

   867         if laststack == qstack:

   861         if laststack == qstack:

   868             continue

   862             continue