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09612de7e9
All variables are 64-bit and so %l / %ll are not required, and the
latter is actually invalid:
$ sudo stap -e 'probe begin{printf ("BEGIN")}' -I .
parse error: invalid or missing conversion specifier
saw: operator ',' at ./qemu-system-x86_64-log.stp:15118:101
source: printf("%d@%d vhost_vdpa_set_log_base dev: %p base: 0x%x size: %llu
refcnt: %d fd: %d log: %p\n", pid(), gettimeofday_ns(), dev, base, size, refcnt, fd, log)
^
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Laurent Vivier <lvivier@redhat.com>
Message-id: 20210106130239.1004729-1-berrange@redhat.com
[Fixed "simiarly" typo found by Laurent Vivier <lvivier@redhat.com>
--Stefan]
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
130 lines
3.9 KiB
Python
130 lines
3.9 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Generate .stp file that printfs log messages (DTrace with SystemTAP only).
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"""
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__author__ = "Daniel P. Berrange <berrange@redhat.com>"
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__copyright__ = "Copyright (C) 2014-2019, Red Hat, Inc."
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__license__ = "GPL version 2 or (at your option) any later version"
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__maintainer__ = "Daniel Berrange"
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__email__ = "berrange@redhat.com"
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import re
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from tracetool import out
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from tracetool.backend.dtrace import binary, probeprefix
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from tracetool.backend.simple import is_string
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from tracetool.format.stap import stap_escape
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def global_var_name(name):
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return probeprefix().replace(".", "_") + "_" + name
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STATE_SKIP = 0
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STATE_LITERAL = 1
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STATE_MACRO = 2
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def c_macro_to_format(macro):
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if macro.startswith("PRI"):
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return macro[3]
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raise Exception("Unhandled macro '%s'" % macro)
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def c_fmt_to_stap(fmt):
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state = 0
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bits = []
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literal = ""
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macro = ""
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escape = 0;
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for i in range(len(fmt)):
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if fmt[i] == '\\':
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if escape:
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escape = 0
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else:
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escape = 1
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if state != STATE_LITERAL:
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raise Exception("Unexpected escape outside string literal")
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literal = literal + fmt[i]
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elif fmt[i] == '"' and not escape:
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if state == STATE_LITERAL:
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state = STATE_SKIP
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bits.append(literal)
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literal = ""
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else:
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if state == STATE_MACRO:
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bits.append(c_macro_to_format(macro))
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macro = ""
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state = STATE_LITERAL
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elif fmt[i] == ' ' or fmt[i] == '\t':
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if state == STATE_MACRO:
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bits.append(c_macro_to_format(macro))
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macro = ""
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state = STATE_SKIP
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elif state == STATE_LITERAL:
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literal = literal + fmt[i]
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else:
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escape = 0
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if state == STATE_SKIP:
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state = STATE_MACRO
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if state == STATE_LITERAL:
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literal = literal + fmt[i]
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else:
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macro = macro + fmt[i]
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if state == STATE_MACRO:
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bits.append(c_macro_to_format(macro))
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elif state == STATE_LITERAL:
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bits.append(literal)
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# All variables in systemtap are 64-bit in size
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# The "%l" integer size qualifier is thus redundant
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# and "%ll" is not valid at all. Similarly the size_t
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# based "%z" size qualifier is not valid. We just
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# strip all size qualifiers for sanity.
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fmt = re.sub("%(\d*)(l+|z)(x|u|d)", "%\\1\\3", "".join(bits))
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return fmt
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def generate(events, backend, group):
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out('/* This file is autogenerated by tracetool, do not edit. */',
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'')
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for event_id, e in enumerate(events):
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if 'disable' in e.properties:
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continue
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out('probe %(probeprefix)s.log.%(name)s = %(probeprefix)s.%(name)s ?',
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'{',
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probeprefix=probeprefix(),
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name=e.name)
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# Get references to userspace strings
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for type_, name in e.args:
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name = stap_escape(name)
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if is_string(type_):
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out(' try {',
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' arg%(name)s_str = %(name)s ? ' +
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'user_string_n(%(name)s, 512) : "<null>"',
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' } catch {}',
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name=name)
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# Determine systemtap's view of variable names
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fields = ["pid()", "gettimeofday_ns()"]
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for type_, name in e.args:
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name = stap_escape(name)
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if is_string(type_):
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fields.append("arg" + name + "_str")
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else:
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fields.append(name)
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# Emit the entire record in a single SystemTap printf()
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arg_str = ', '.join(arg for arg in fields)
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fmt_str = "%d@%d " + e.name + " " + c_fmt_to_stap(e.fmt) + "\\n"
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out(' printf("%(fmt_str)s", %(arg_str)s)',
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fmt_str=fmt_str, arg_str=arg_str)
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out('}')
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out()
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