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From 7c6cf82e285a657b38a2b2c85e26d975b7e91ae0 Mon Sep 17 00:00:00 2001
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Date: Tue, 7 Oct 2014 14:06:54 +0200
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Subject: [PATCH 36/43] trace: extract stap_escape() function for reuse
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Message-id: <1412690820-31016-6-git-send-email-stefanha@redhat.com>
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Patchwork-id: 61610
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O-Subject: [RHEL7.1 qemu-kvm PATCH 05/11] trace: extract stap_escape() function for reuse
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Bugzilla: 1088112
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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SystemTap reserved words sometimes conflict with QEMU variable names.
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We escape them to prevent conflicts.
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Move escaping into its own function so the next patch can reuse it.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit a76ccf3c1cb06576af091c5ac8bc264515b1bb7f)
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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Conflicts:
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scripts/tracetool/format/stap.py
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The tracetool downstream code is missing the TCG instrumentation and
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multi-backend tracing, which involved a reorganization of the code.
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The upstream patch modified scripts/tracetool/format/stap.py but
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downstream the right file is scripts/tracetool/backend/dtrace.py.
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---
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scripts/tracetool/backend/dtrace.py | 11 ++++++++---
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1 file changed, 8 insertions(+), 3 deletions(-)
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diff --git a/scripts/tracetool/backend/dtrace.py b/scripts/tracetool/backend/dtrace.py
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index e31bc79..614316f 100644
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--- a/scripts/tracetool/backend/dtrace.py
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+++ b/scripts/tracetool/backend/dtrace.py
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@@ -35,6 +35,13 @@ def _binary():
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return BINARY
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+def stap_escape(identifier):
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+ # Append underscore to reserved keywords
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+ if identifier in RESERVED_WORDS:
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+ return identifier + '_'
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+ return identifier
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+
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+
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def c(events):
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pass
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@@ -98,9 +105,7 @@ def stap(events):
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i = 1
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if len(e.args) > 0:
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for name in e.args.names():
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- # Append underscore to reserved keywords
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- if name in RESERVED_WORDS:
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- name += '_'
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+ name = stap_escape(name)
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out(' %s = $arg%d;' % (name, i))
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i += 1
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--
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1.8.3.1
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