From f2db9f24cb7bc4d7ce9bf169bd06dd7ec5e17a1d Mon Sep 17 00:00:00 2001
From: Simon Ruderich <simon@ruderich.org>
Date: Mon, 26 Mar 2012 04:05:07 +0200
Subject: [PATCH] Precompile flag regexps.

Speeds up any_flags_used() and all_flags_used().
---
 bin/blhc | 55 ++++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 46 insertions(+), 9 deletions(-)

diff --git a/bin/blhc b/bin/blhc
index 7b228ec..ad98dc5 100755
--- a/bin/blhc
+++ b/bin/blhc
@@ -191,7 +191,12 @@ my @def_ldflags_pie = (
     '-fPIE',
     '-pie',
 );
-# Renaming rules for the output so the regex parts are not visible.
+my @def_ldflags_pic = (
+    '-fPIC',
+    '-fpic',
+);
+# Renaming rules for the output so the regex parts are not visible. Also
+# stores string values of flag regexps above, see compile_flag_regexp().
 my %flag_renames = (
     '-O(?:2|3)'       => '-O2',
     '-Wl,(-z,)?relro' => '-Wl,-z,relro',
@@ -207,12 +212,10 @@ my $option_color;
 sub error_flags {
     my ($message, $missing_flags_ref, $flag_renames_ref, $line) = @_;
 
-    # Rename flags if requested.
+    # Get string value of qr//-escaped regexps and if requested rename them.
     my @missing_flags = map {
-        (exists $flag_renames_ref->{$_})
-            ? $flag_renames_ref->{$_}
-            : $_
-    } @{$missing_flags_ref};
+            $flag_renames_ref->{$_}
+        } @{$missing_flags_ref};
 
     my $flags = join ' ', @missing_flags;
     printf "%s (%s)%s %s",
@@ -247,7 +250,7 @@ sub any_flags_used {
     my ($line, @flags) = @_;
 
     foreach my $flag (@flags) {
-        return 1 if $line =~ /\s$flag(?:\s|\\)/;
+        return 1 if $line =~ /$flag/;
     }
 
     return 0;
@@ -257,7 +260,7 @@ sub all_flags_used {
 
     my @missing_flags = ();
     foreach my $flag (@flags) {
-        if ($line !~ /\s$flag(?:\s|\\)/) {
+        if (not $line =~ /$flag/) {
             push @missing_flags, $flag;
         }
     }
@@ -273,7 +276,7 @@ sub pic_pie_conflict {
     my ($line, $pie, $missing_flags_ref, @flags_pie) = @_;
 
     return 0 if not $pie;
-    return 0 if not any_flags_used($line, ('-fPIC', '-fpic'));
+    return 0 if not any_flags_used($line, @def_ldflags_pic);
 
     my %flags = map { $_ => 1 } @flags_pie;
 
@@ -329,6 +332,24 @@ sub is_non_verbose_build {
     return 1;
 }
 
+sub compile_flag_regexp {
+    my ($flag_renames_ref, @flags) = @_;
+
+    my @result = ();
+    foreach my $flag (@flags) {
+        # Store flag name in replacement string for correct flags in messages
+        # with qr//ed flag regexps.
+        $flag_renames_ref->{qr/\s$flag(?:\s|\\)/}
+            = (exists $flag_renames_ref->{$flag})
+                ? $flag_renames_ref->{$flag}
+                : $flag;
+
+        # Compile flag regexp for faster execution.
+        push @result, qr/\s$flag(?:\s|\\)/;
+    }
+    return @result;
+}
+
 sub extension_found {
     my ($extensions_ref, @extensions) = @_;
 
@@ -397,6 +418,22 @@ if ($option_all) {
     $option_bindnow = 1;
 }
 
+# Precompile all flag regexps. any_flags_used(), all_flags_used() get a lot
+# faster with this.
+@def_cflags           = compile_flag_regexp(\%flag_renames, @def_cflags);
+@def_cflags_format    = compile_flag_regexp(\%flag_renames, @def_cflags_format);
+@def_cflags_fortify   = compile_flag_regexp(\%flag_renames, @def_cflags_fortify);
+@def_cflags_stack     = compile_flag_regexp(\%flag_renames, @def_cflags_stack);
+@def_cflags_pie       = compile_flag_regexp(\%flag_renames, @def_cflags_pie);
+@def_cxxflags         = compile_flag_regexp(\%flag_renames, @def_cxxflags);
+@def_cppflags         = compile_flag_regexp(\%flag_renames, @def_cppflags);
+@def_cppflags_fortify = compile_flag_regexp(\%flag_renames, @def_cppflags_fortify);
+@def_ldflags          = compile_flag_regexp(\%flag_renames, @def_ldflags);
+@def_ldflags_relro    = compile_flag_regexp(\%flag_renames, @def_ldflags_relro);
+@def_ldflags_bindnow  = compile_flag_regexp(\%flag_renames, @def_ldflags_bindnow);
+@def_ldflags_pie      = compile_flag_regexp(\%flag_renames, @def_ldflags_pie);
+@def_ldflags_pic      = compile_flag_regexp(\%flag_renames, @def_ldflags_pic);
+
 # Final exit code.
 my $exit = 0;
 
-- 
2.43.2