[Libvir] Remove more useless if tests before "free"-like functions.
Jim Meyering
jim at meyering.net
Thu Feb 7 11:06:11 UTC 2008
A few new uses of already-checked functions were added recently,
and I've added xmlXPathFreeObject to the list, so that exposed
a bunch more.
-----------------------------------------------------------
Remove more useless if tests before "free"-like functions.
* build-aux/useless-if-before-free: Rename from ...
* build-aux/find-unnecessary-if-before-free: ... this. Remove file.
Also changed it so that new names are no longer hard-coded in the
script. Instead, they're supplied via options:
* Makefile.cfg (useless_free_options): Define.
Add xmlXPathFreeObject to the list of free-like functions it detects.
* Makefile.maint (sc_avoid_if_before_free): Reflect script renaming.
* .x-sc_avoid_if_before_free: Likewise.
* src/openvz_conf.c (openvzParseXML): Remove useless "if"-before-free.
* src/qemu_conf.c (qemudParseXML, qemudParseNetworkXML): Likewise.
* src/virsh.c (cmdVNCDisplay, cmdTTYConsole, cmdDetachInterface):
(cmdDetachDisk): Likewise.
* src/xm_internal.c (xenXMConfigSetIntFromXPath): Likewise.
(xenXMConfigSetStringFromXPath, xenXMParseXMLToConfig): Likewise.
(xenXMDomainAttachDevice, xenXMAttachDisk, xenXMAttachInterface):
(xenXMDomainDetachDevice): Likewise.
* src/xml.c (virXPathString): Likewise.
* tests/xmlrpctest.c (checkRequestValue): Likewise.
Signed-off-by: Jim Meyering <meyering at redhat.com>
---
.x-sc_avoid_if_before_free | 2 +-
Makefile.cfg | 5 +
Makefile.maint | 5 +-
build-aux/find-unnecessary-if-before-free | 42 ----------
build-aux/useless-if-before-free | 118 +++++++++++++++++++++++++++++
src/openvz_conf.c | 3 +-
src/qemu_conf.c | 44 ++++-------
src/virsh.c | 12 +--
src/xm_internal.c | 60 +++++----------
src/xml.c | 3 +-
tests/xmlrpctest.c | 5 +-
11 files changed, 170 insertions(+), 129 deletions(-)
delete mode 100755 build-aux/find-unnecessary-if-before-free
create mode 100755 build-aux/useless-if-before-free
diff --git a/.x-sc_avoid_if_before_free b/.x-sc_avoid_if_before_free
index f83ae7b..5093ef6 100644
--- a/.x-sc_avoid_if_before_free
+++ b/.x-sc_avoid_if_before_free
@@ -1,5 +1,5 @@
^gnulib/lib/getaddrinfo\.c$
^gnulib/lib/printf-parse\.c$
^gnulib/lib/vasnprintf\.c$
-^build-aux/find-unnecessary-if-before-free$
+^build-aux/useless-if-before-free$
^ChangeLog$
diff --git a/Makefile.cfg b/Makefile.cfg
index a9578ab..4543ebd 100644
--- a/Makefile.cfg
+++ b/Makefile.cfg
@@ -52,3 +52,8 @@ local-checks-to-skip = \
patch-check \
check-AUTHORS \
changelog-check
+
+useless_free_options = \
+ --name=sexpr_free \
+ --name=xmlXPathFreeContext \
+ --name=xmlXPathFreeObject
diff --git a/Makefile.maint b/Makefile.maint
index 923c422..8624328 100644
--- a/Makefile.maint
+++ b/Makefile.maint
@@ -40,7 +40,8 @@ syntax-check: $(local-check)
## --------------- ##
sc_avoid_if_before_free:
- @$(srcdir)/build-aux/find-unnecessary-if-before-free \
+ @$(srcdir)/build-aux/useless-if-before-free \
+ $(useless_free_options) \
$$($(CVS_LIST_EXCEPT)) && \
{ echo '$(ME): found useless "if" before "free" above' 1>&2; \
exit 1; } || :
@@ -288,7 +289,7 @@ sc_two_space_separator_in_usage:
1>&2; exit 1; } || :
err_func_re = \
-(DISABLE_fprintf|(xmlRpc|vir(Xend|XML|Hash|Conf|Test|LibConn))Error)
+(DISABLE_fprintf|qemudLog|(xmlRpc|vir(Xend|XML|Hash|Conf|Test|LibConn))Error)
# Look for diagnostics that aren't marked for translation.
# This won't find any for which error's format string is on a separate line.
diff --git a/build-aux/find-unnecessary-if-before-free b/build-aux/find-unnecessary-if-before-free
deleted file mode 100755
index 0cd38eb..0000000
--- a/build-aux/find-unnecessary-if-before-free
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/usr/bin/perl
-# Detect instances of "if (p) free (p);".
-# Likewise for "if (p != NULL) free (p);".
-# Exit status is like grep: 0 for no match. 1 for any number.
-
-# Note: giving line numbers isn't practical, since I've reset the
-# input record separator.
-use strict;
-use warnings;
-(my $ME = $0) =~ s|.*/||;
-
-{
- # Use ';' as the input record separator.
- $/ = ';';
-
- my $found_match = 0;
- foreach my $file (@ARGV)
- {
- open FH, '<', $file
- or die "$ME: can't open `$file' for reading: $!\n";
- while (defined (my $line = <FH>))
- {
- if ($line =~
- /\b(if\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)
- \s+(?:xmlXPathFreeContext|(?:sexpr_)?free)\s*\(\s*\2\s*\))/sx)
- {
- print "$file: $1\n";
- $found_match = 1;
- }
- }
- close FH;
- }
- exit !$found_match;
-}
-
-my $foo = <<'EOF';
-# The above is to *find* them.
-# This adjusts them, removing the unnecessary "if (p)" part.
-
-git ls-files -z --exclude=find-unnecessary-if-before-free |xargs -0 \
-perl -0x3b -pi -e 's/\bif\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)\s+((?:xmlXPathFreeContext|(?:sexpr_)?free)\s*\(\s*\1\s*\))/$2/s'
-EOF
diff --git a/build-aux/useless-if-before-free b/build-aux/useless-if-before-free
new file mode 100755
index 0000000..57040a3
--- /dev/null
+++ b/build-aux/useless-if-before-free
@@ -0,0 +1,118 @@
+#!/usr/bin/perl -T
+# Detect instances of "if (p) free (p);".
+# Likewise for "if (p != NULL) free (p);".
+
+my $VERSION = '2008-02-04 22:25'; # UTC
+# The definition above must lie within the first 8 lines in order
+# for the Emacs time-stamp write hook (at end) to update it.
+# If you change this file with Emacs, please let the write hook
+# do its job. Otherwise, update this string manually.
+
+# Exit status is like grep: 0 for no match. 1 for any number.
+# Note: giving line numbers isn't practical, since I've reset the
+# input record separator.
+use strict;
+use warnings;
+use Getopt::Long;
+
+(my $ME = $0) =~ s|.*/||;
+
+my $debug = 0;
+my $verbose = 0;
+
+sub usage ($)
+{
+ my ($exit_code) = @_;
+ my $STREAM = ($exit_code == 0 ? *STDOUT : *STDERR);
+ if ($exit_code != 0)
+ {
+ print $STREAM "Try `$ME --help' for more information.\n";
+ }
+ else
+ {
+ print $STREAM <<EOF;
+Usage: $ME [OPTIONS] FILE...
+
+OPTIONS:
+
+ --name=N add name N to the list of `free'-like functions to detect;
+ may be repeated
+
+ --help display this help and exit
+ --version output version information and exit
+ --verbose generate verbose output
+
+EXAMPLE:
+
+ git ls-files -z |xargs -0 $ME
+
+EOF
+ }
+ exit $exit_code;
+}
+
+{
+ my @name = qw(free);
+ GetOptions
+ (
+ debug => \$debug,
+ verbose => \$verbose,
+ help => sub { usage 0 },
+ version => sub { print "$ME version $VERSION\n"; exit },
+ 'name=s@' => \@name,
+ ) or usage 1;
+
+ # Make sure we have the right number of non-option arguments.
+ # Always tell the user why we fail.
+ @ARGV < 1
+ and (warn "$ME: missing FILE argument\n"), usage 1;
+
+ my $or = join '|', @name;
+ my $regexp = qr/(?:$or)/;
+
+ # Set the input record separator.
+ $/ = '"';
+
+ my $found_match = 0;
+ foreach my $file (@ARGV)
+ {
+ open FH, '<', $file
+ or die "$ME: can't open `$file' for reading: $!\n";
+ while (defined (my $line = <FH>))
+ {
+ if ($line =~
+ /\b(if\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)
+ (?: \s*$regexp\s*\(\s*\2\s*\)|
+ \s*\{\s*$regexp\s*\(\s*\2\s*\)\s*;\s*\}))/sx)
+ {
+ print "$file: $1\n";
+ $found_match = 1;
+ }
+ }
+ close FH;
+ }
+ exit !$found_match;
+}
+
+my $foo = <<'EOF';
+# The above is to *find* them.
+# This adjusts them, removing the unnecessary "if (p)" part.
+
+# FIXME: do something like this as an option.
+git ls-files -z --exclude=$ME |xargs -0 \
+perl -0x3b -pi -e 's/\bif\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)\s+((?:sexpr_)?free\s*\(\s*\1\s*\))/$2/s'
+
+When modifying files, refuse to process anything other than a regular file.
+
+# Or this one-liner to detect them:
+git ls-files -z |xargs -0 perl -00 -ne '/\b(if\s*\(\s*(\S+?)(?:\s*!=\s*NULL)?\s*\)(?:\s*(?:sexpr_)?free\s*\(\s*\2\s*\)|\s*\{\s*(?:sexpr_)?free\s*\(\s*\2\s*\)\s*;\s*\}))/sx and print "$1\n"'
+EOF
+
+## Local Variables:
+## indent-tabs-mode: nil
+## eval: (add-hook 'write-file-hooks 'time-stamp)
+## time-stamp-start: "my $VERSION = '"
+## time-stamp-format: "%:y-%02m-%02d %02H:%02M"
+## time-stamp-time-zone: "UTC"
+## time-stamp-end: "'; # UTC"
+## End:
diff --git a/src/openvz_conf.c b/src/openvz_conf.c
index ebed9b2..482de82 100644
--- a/src/openvz_conf.c
+++ b/src/openvz_conf.c
@@ -495,8 +495,7 @@ static struct openvz_vm_def
bail_out:
free(prop);
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
xmlXPathFreeContext(ctxt);
openvzFreeVMDef(def);
diff --git a/src/qemu_conf.c b/src/qemu_conf.c
index 39cfdc1..aba8890 100644
--- a/src/qemu_conf.c
+++ b/src/qemu_conf.c
@@ -1,7 +1,7 @@
/*
* config.c: VM configuration management
*
- * Copyright (C) 2006, 2007 Red Hat, Inc.
+ * Copyright (C) 2006, 2007, 2008 Red Hat, Inc.
* Copyright (C) 2006 Daniel P. Berrange
*
* This library is free software; you can redistribute it and/or
@@ -1004,8 +1004,7 @@ static struct qemud_vm_def *qemudParseXML(virConnectPtr conn,
goto error;
}
}
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
/* Extract domain memory */
@@ -1023,8 +1022,7 @@ static struct qemud_vm_def *qemudParseXML(virConnectPtr conn,
goto error;
}
}
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
/* Extract domain vcpu info */
obj = xmlXPathEval(BAD_CAST "string(/domain/vcpu[1])", ctxt);
@@ -1039,8 +1037,7 @@ static struct qemud_vm_def *qemudParseXML(virConnectPtr conn,
goto error;
}
}
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
/* See if ACPI feature is requested */
obj = xmlXPathEval(BAD_CAST "/domain/features/acpi", ctxt);
@@ -1062,8 +1059,7 @@ static struct qemud_vm_def *qemudParseXML(virConnectPtr conn,
else
def->noReboot = 0;
}
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
/* See if we set clock to localtime */
obj = xmlXPathEval(BAD_CAST "string(/domain/clock/@offset)", ctxt);
@@ -1076,8 +1072,7 @@ static struct qemud_vm_def *qemudParseXML(virConnectPtr conn,
else
def->localtime = 0;
}
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
/* Extract OS type info */
@@ -1111,8 +1106,7 @@ static struct qemud_vm_def *qemudParseXML(virConnectPtr conn,
}
strcpy(def->os.arch, (const char *)obj->stringval);
}
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "string(/domain/os/type[1]/@machine)", ctxt);
if ((obj == NULL) || (obj->type != XPATH_STRING) ||
@@ -1134,8 +1128,7 @@ static struct qemud_vm_def *qemudParseXML(virConnectPtr conn,
}
strcpy(def->os.machine, (const char *)obj->stringval);
}
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "string(/domain/os/kernel[1])", ctxt);
@@ -1147,8 +1140,7 @@ static struct qemud_vm_def *qemudParseXML(virConnectPtr conn,
}
strcpy(def->os.kernel, (const char *)obj->stringval);
}
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "string(/domain/os/initrd[1])", ctxt);
@@ -1160,8 +1152,7 @@ static struct qemud_vm_def *qemudParseXML(virConnectPtr conn,
}
strcpy(def->os.initrd, (const char *)obj->stringval);
}
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "string(/domain/os/cmdline[1])", ctxt);
@@ -1173,8 +1164,7 @@ static struct qemud_vm_def *qemudParseXML(virConnectPtr conn,
}
strcpy(def->os.cmdline, (const char *)obj->stringval);
}
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
/* analysis of the disk devices */
@@ -1224,8 +1214,7 @@ static struct qemud_vm_def *qemudParseXML(virConnectPtr conn,
}
strcpy(def->os.binary, (const char *)obj->stringval);
}
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
obj = xmlXPathEval(BAD_CAST "/domain/devices/graphics", ctxt);
if ((obj == NULL) || (obj->type != XPATH_NODESET) ||
@@ -1382,8 +1371,7 @@ static struct qemud_vm_def *qemudParseXML(virConnectPtr conn,
error:
free(prop);
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
xmlXPathFreeContext(ctxt);
qemudFreeVMDef(def);
return NULL;
@@ -2389,10 +2377,8 @@ static struct qemud_network_def *qemudParseNetworkXML(virConnectPtr conn,
error:
/* XXX free all the stuff in the qemud_network struct, or leave it upto
the caller ? */
- if (obj)
- xmlXPathFreeObject(obj);
- if (tmp)
- xmlXPathFreeObject(tmp);
+ xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(tmp);
xmlXPathFreeContext(ctxt);
qemudFreeNetworkDef(def);
return NULL;
diff --git a/src/virsh.c b/src/virsh.c
index 36808ed..9521eff 100644
--- a/src/virsh.c
+++ b/src/virsh.c
@@ -2931,8 +2931,7 @@ cmdVNCDisplay(vshControl * ctl, vshCmd * cmd)
ret = TRUE;
cleanup:
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
xmlXPathFreeContext(ctxt);
if (xml)
xmlFreeDoc(xml);
@@ -2993,8 +2992,7 @@ cmdTTYConsole(vshControl * ctl, vshCmd * cmd)
vshPrint(ctl, "%s\n", (const char *)obj->stringval);
cleanup:
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
xmlXPathFreeContext(ctxt);
if (xml)
xmlFreeDoc(xml);
@@ -3338,8 +3336,7 @@ cmdDetachInterface(vshControl * ctl, vshCmd * cmd)
cleanup:
if (dom)
virDomainFree(dom);
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
xmlXPathFreeContext(ctxt);
if (xml)
xmlFreeDoc(xml);
@@ -3611,8 +3608,7 @@ cmdDetachDisk(vshControl * ctl, vshCmd * cmd)
ret = TRUE;
cleanup:
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
xmlXPathFreeContext(ctxt);
if (xml)
xmlFreeDoc(xml);
diff --git a/src/xm_internal.c b/src/xm_internal.c
index b3a9f3a..fbef462 100644
--- a/src/xm_internal.c
+++ b/src/xm_internal.c
@@ -1556,8 +1556,7 @@ int xenXMConfigSetIntFromXPath(virConnectPtr conn,
ret = 0;
error:
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
return ret;
}
@@ -1591,8 +1590,7 @@ int xenXMConfigSetStringFromXPath(virConnectPtr conn,
ret = 0;
error:
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
return ret;
}
@@ -2278,8 +2276,7 @@ virConfPtr xenXMParseXMLToConfig(virConnectPtr conn, const char *xml) {
virConfFree(conf);
if (prop != NULL)
xmlFree(prop);
- if (obj != NULL)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
xmlXPathFreeContext(ctxt);
if (doc != NULL)
xmlFreeDoc(doc);
@@ -2578,8 +2575,7 @@ xenXMDomainAttachDevice(virDomainPtr domain, const char *xml) {
(obj->stringval) && (STREQ((char *)obj->stringval, "hvm")))
hvm = 1;
- if (ctxt)
- xmlXPathFreeContext(ctxt);
+ xmlXPathFreeContext(ctxt);
ctxt = NULL;
if (doc)
xmlFreeDoc(doc);
@@ -2617,12 +2613,9 @@ xenXMDomainAttachDevice(virDomainPtr domain, const char *xml) {
ret = 0;
cleanup:
- if (domxml)
- free(domxml);
- if (obj)
- xmlXPathFreeObject(obj);
- if (ctxt)
- xmlXPathFreeContext(ctxt);
+ free(domxml);
+ xmlXPathFreeObject(obj);
+ xmlXPathFreeContext(ctxt);
if (doc)
xmlFreeDoc(doc);
@@ -2736,8 +2729,7 @@ xenXMAttachDisk(virDomainPtr domain, xmlXPathContextPtr ctxt, int hvm,
prev->next = list_val;
} else {
/* configure */
- if (list_val->str)
- free(list_val->str);
+ free(list_val->str);
list_val->str = dev;
}
@@ -2745,12 +2737,9 @@ xenXMAttachDisk(virDomainPtr domain, xmlXPathContextPtr ctxt, int hvm,
goto cleanup;
cleanup:
- if (type)
- free(type);
- if (source)
- free(source);
- if (target)
- free(target);
+ free(type);
+ free(source);
+ free(target);
return (ret);
}
@@ -2823,8 +2812,7 @@ xenXMAttachInterface(virDomainPtr domain, xmlXPathContextPtr ctxt, int hvm,
if (!(strcmp(dommac, (const char *) mac))) {
if (autoassign) {
- if (mac)
- free(mac);
+ free(mac);
mac = NULL;
if (!(mac = (xmlChar *)xenXMAutoAssignMac()))
goto cleanup;
@@ -2912,8 +2900,7 @@ xenXMAttachInterface(virDomainPtr domain, xmlXPathContextPtr ctxt, int hvm,
prev->next = list_val;
} else {
/* configure */
- if (list_val->str)
- free(list_val->str);
+ free(list_val->str);
list_val->str = dev;
}
@@ -2928,12 +2915,9 @@ xenXMAttachInterface(virDomainPtr domain, xmlXPathContextPtr ctxt, int hvm,
if (text_node)
xmlFree(text_node);
cleanup:
- if (type)
- free(type);
- if (source)
- free(source);
- if (mac)
- free(mac);
+ free(type);
+ free(source);
+ free(mac);
return (ret);
}
@@ -3137,16 +3121,12 @@ xenXMDomainDetachDevice(virDomainPtr domain, const char *xml) {
ret = 0;
cleanup:
- if (ctxt)
- xmlXPathFreeContext(ctxt);
+ xmlXPathFreeContext(ctxt);
if (doc)
xmlFreeDoc(doc);
- if (domdevice)
- free(domdevice);
- if (key)
- free(key);
- if (list_val)
- free(list_val);
+ free(domdevice);
+ free(key);
+ free(list_val);
return (ret);
}
diff --git a/src/xml.c b/src/xml.c
index 614deb0..4ac1765 100644
--- a/src/xml.c
+++ b/src/xml.c
@@ -479,8 +479,7 @@ virXPathString(const char *xpath, xmlXPathContextPtr ctxt)
obj = xmlXPathEval(BAD_CAST xpath, ctxt);
if ((obj == NULL) || (obj->type != XPATH_STRING) ||
(obj->stringval == NULL) || (obj->stringval[0] == 0)) {
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
return (NULL);
}
ret = strdup((char *) obj->stringval);
diff --git a/tests/xmlrpctest.c b/tests/xmlrpctest.c
index 9297004..5c16b0b 100644
--- a/tests/xmlrpctest.c
+++ b/tests/xmlrpctest.c
@@ -1,7 +1,7 @@
/*
* xmlrpctest.c: simple client for XML-RPC tests
*
- * Copyright (C) 2005 Red Hat, Inc.
+ * Copyright (C) 2005, 2008 Red Hat, Inc.
*
* See COPYING.LIB for the License of this software
*
@@ -119,8 +119,7 @@ checkRequestValue(const char *xmlstr, const char *xpath, int type, void *expecte
ret = 0;
error:
- if (obj)
- xmlXPathFreeObject(obj);
+ xmlXPathFreeObject(obj);
xmlXPathFreeContext(ctxt);
if (xml)
xmlFreeDoc(xml);
--
1.5.4.30.g7dbe
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