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tracing: Add regex for weak functions in recordmcount.pl

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Add a variable to contain the regex needed to find weak functions
in the 'nm' output. This will allow other archs to easily override it.

Also rename the regex variable $nm_regex to $local_regex to be more
descriptive.

Signed-off-by: Li Hong <lihong.hi@gmail.com>
LKML-Reference: <20091028050619.GF30758@uhli>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Li Hong 2009-10-28 13:06:19 +08:00 committed by Steven Rostedt
parent db24c7dcf4
commit 306dcf47d2
1 changed files with 9 additions and 7 deletions
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16
scripts/recordmcount.pl
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@ -92,7 +92,7 @@
# #
# Here are the steps we take: # Here are the steps we take:
# #
# 1) Record all the local symbols by using 'nm' # 1) Record all the local and weak symbols by using 'nm'
# 2) Use objdump to find all the call site offsets and sections for # 2) Use objdump to find all the call site offsets and sections for
# mcount. # mcount.
# 3) Compile the list into its own object. # 3) Compile the list into its own object.
@ -152,7 +152,8 @@ my %weak; # List of weak functions
my %convert; # List of local functions used that needs conversion my %convert; # List of local functions used that needs conversion
my $type; my $type;
my $nm_regex; # Find the local functions (return function) my $local_regex; # Match a local function (return function)
my $weak_regex; # Match a weak function (return function)
my $section_regex; # Find the start of a section my $section_regex; # Find the start of a section
my $function_regex; # Find the name of a function my $function_regex; # Find the name of a function
# (return offset and func name) # (return offset and func name)
@ -197,7 +198,8 @@ if ($arch eq "x86") {
# We base the defaults off of i386, the other archs may # We base the defaults off of i386, the other archs may
# feel free to change them in the below if statements. # feel free to change them in the below if statements.
# #
$nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)"; $local_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\S+)";
$weak_regex = "^[0-9a-fA-F]+\\s+([wW])\\s+(\\S+)";
$section_regex = "Disassembly of section\\s+(\\S+):"; $section_regex = "Disassembly of section\\s+(\\S+):";
$function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:"; $function_regex = "^([0-9a-fA-F]+)\\s+<(.*?)>:";
$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$"; $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\smcount\$";
@ -246,7 +248,7 @@ if ($arch eq "x86_64") {
$cc .= " -m32"; $cc .= " -m32";
} elsif ($arch eq "powerpc") { } elsif ($arch eq "powerpc") {
$nm_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\.?\\S+)"; $local_regex = "^[0-9a-fA-F]+\\s+t\\s+(\\.?\\S+)";
$function_regex = "^([0-9a-fA-F]+)\\s+<(\\.?.*?)>:"; $function_regex = "^([0-9a-fA-F]+)\\s+<(\\.?.*?)>:";
$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s\\.?_mcount\$"; $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s\\.?_mcount\$";
@ -322,13 +324,13 @@ check_objcopy();
# #
# Step 1: find all the local (static functions) and weak symbols. # Step 1: find all the local (static functions) and weak symbols.
# 't' is local, 'w/W' is weak (we never use a weak function) # 't' is local, 'w/W' is weak
# #
open (IN, "$nm $inputfile|") || die "error running $nm"; open (IN, "$nm $inputfile|") || die "error running $nm";
while (<IN>) { while (<IN>) {
if (/$nm_regex/) { if (/$local_regex/) {
$locals{$1} = 1; $locals{$1} = 1;
} elsif (/^[0-9a-fA-F]+\s+([wW])\s+(\S+)/) { } elsif (/$weak_regex/) {
$weak{$2} = $1; $weak{$2} = $1;
} }
} }