X-Git-Url: https://ruderich.org/simon/gitweb/?a=blobdiff_plain;f=src%2Fcoloredstderr.c;h=dcd1166edae9f86d65f8d57c57cee2f7096ccfef;hb=afca2864dc6464201dfe32134ae20e0107297836;hp=8775541a61e8c6b42d871b0c8cf78628d31f6a0f;hpb=dfd317650f05542db49d7bc37649a232f28efa3f;p=coloredstderr%2Fcoloredstderr.git

diff --git a/src/coloredstderr.c b/src/coloredstderr.c
index 8775541..dcd1166 100644
--- a/src/coloredstderr.c
+++ b/src/coloredstderr.c
@@ -20,6 +20,8 @@
 
 #include <config.h>
 
+#include "compiler.h"
+
 /* Must be loaded before the following headers. */
 #include "ldpreload.h"
 
@@ -60,25 +62,14 @@ static int force_write_to_non_tty;
 
 
 
-/* Should the "action" handler be invoked for this file descriptor? */
-static int check_handle_fd(int fd) {
-    /* Load state from environment. Only necessary once per process. */
-    if (!initialized) {
-        init_from_environment();
-    }
+/* See hookmacros.h for the decision if a function call is colored. */
 
-    /* tracked_fds_find() is most likely faster than calling isatty(),
-     * therefore check if we are tracking this file descriptor first. */
-    if (!tracked_fds_find(fd)) {
-        return 0;
-    }
-
-    /* Never touch anything not going to a terminal - unless we are explicitly
-     * asked to do so. */
-    if (force_write_to_non_tty) {
-        return 1;
-    }
 
+/* Prevent inlining into hook functions because it may increase the number of
+ * spilled registers unnecessarily. As it's not called very often accept the
+ * additional call. */
+static int isatty_noinline(int fd) noinline;
+static int isatty_noinline(int fd) {
     int saved_errno = errno;
     int result = isatty(fd);
     errno = saved_errno;
@@ -86,12 +77,13 @@ static int check_handle_fd(int fd) {
     return result;
 }
 
+
 static void dup_fd(int oldfd, int newfd) {
 #ifdef DEBUG
     debug("%3d -> %3d\t\t\t[%d]\n", oldfd, newfd, getpid());
 #endif
 
-    if (!initialized) {
+    if (unlikely(!initialized)) {
         init_from_environment();
     }
 
@@ -113,7 +105,7 @@ static void close_fd(int fd) {
     debug("%3d ->   .\t\t\t[%d]\n", fd, getpid());
 #endif
 
-    if (!initialized) {
+    if (unlikely(!initialized)) {
         init_from_environment();
     }
 
@@ -130,7 +122,7 @@ static size_t post_string_size;
 
 /* Load alternative pre/post strings from the environment if available, fall
  * back to default values. */
-inline static void init_pre_post_string(void) {
+static void init_pre_post_string(void) {
     pre_string = getenv(ENV_NAME_PRE_STRING);
     if (!pre_string) {
         pre_string = DEFAULT_PRE_STRING;
@@ -144,10 +136,17 @@ inline static void init_pre_post_string(void) {
     post_string_size = strlen(post_string);
 }
 
+/* Don't inline any of the pre/post functions. Keep the hook function as small
+ * as possible for speed reasons. */
+static void handle_fd_pre(int fd) noinline;
+static void handle_fd_post(int fd) noinline;
+static void handle_file_pre(FILE *stream) noinline;
+static void handle_file_post(FILE *stream) noinline;
+
 static void handle_fd_pre(int fd) {
     int saved_errno = errno;
 
-    if (!pre_string || !post_string) {
+    if (unlikely(!pre_string || !post_string)) {
         init_pre_post_string();
     }
 
@@ -168,7 +167,7 @@ static void handle_fd_post(int fd) {
 static void handle_file_pre(FILE *stream) {
     int saved_errno = errno;
 
-    if (!pre_string || !post_string) {
+    if (unlikely(!pre_string || !post_string)) {
         init_pre_post_string();
     }