#!/usr/bin/env python # -*- coding: utf-8 -*- """ DTrace/SystemTAP backend. """ __author__ = "LluÃs Vilanova <vilanova@ac.upc.edu>" __copyright__ = "Copyright 2012, LluÃs Vilanova <vilanova@ac.upc.edu>" __license__ = "GPL version 2 or (at your option) any later version" __maintainer__ = "Stefan Hajnoczi" __email__ = "stefanha@linux.vnet.ibm.com" from tracetool import out PUBLIC = True PROBEPREFIX = None def _probeprefix(): if PROBEPREFIX is None: raise ValueError("you must set PROBEPREFIX") return PROBEPREFIX BINARY = None def _binary(): if BINARY is None: raise ValueError("you must set BINARY") return BINARY def c(events): pass def h(events): out('#include "trace/generated-tracers-dtrace.h"', '') for e in events: out('static inline void trace_%(name)s(%(args)s) {', ' QEMU_%(uppername)s(%(argnames)s);', '}', name = e.name, args = e.args, uppername = e.name.upper(), argnames = ", ".join(e.args.names()), ) def d(events): out('provider qemu {') for e in events: args = str(e.args) # DTrace provider syntax expects foo() for empty # params, not foo(void) if args == 'void': args = '' # Define prototype for probe arguments out('', 'probe %(name)s(%(args)s);', name = e.name, args = args, ) out('', '};') # Technically 'self' is not used by systemtap yet, but # they recommended we keep it in the reserved list anyway RESERVED_WORDS = ( 'break', 'catch', 'continue', 'delete', 'else', 'for', 'foreach', 'function', 'global', 'if', 'in', 'limit', 'long', 'next', 'probe', 'return', 'self', 'string', 'try', 'while' ) def stap(events): for e in events: # Define prototype for probe arguments out('probe %(probeprefix)s.%(name)s = process("%(binary)s").mark("%(name)s")', '{', probeprefix = _probeprefix(), name = e.name, binary = _binary(), ) i = 1 if len(e.args) > 0: for name in e.args.names(): # Append underscore to reserved keywords if name in RESERVED_WORDS: name += '_' out(' %s = $arg%d;' % (name, i)) i += 1 out('}') out()