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-rw-r--r--twin/tools/xreply/Makefile2
-rw-r--r--twin/tools/xreply/xreply.c197
2 files changed, 199 insertions, 0 deletions
diff --git a/twin/tools/xreply/Makefile b/twin/tools/xreply/Makefile
new file mode 100644
index 000000000..af06929d5
--- /dev/null
+++ b/twin/tools/xreply/Makefile
@@ -0,0 +1,2 @@
+all:
+ gcc -O2 -Wall -shared -fPIC -o libxreply.so xreply.c
diff --git a/twin/tools/xreply/xreply.c b/twin/tools/xreply/xreply.c
new file mode 100644
index 000000000..ecdf6ebc3
--- /dev/null
+++ b/twin/tools/xreply/xreply.c
@@ -0,0 +1,197 @@
+/*
+
+ LD_PRELOAD library that gives statistic on number of roundtrips in an application.
+
+ $XREPLY_BACKTRACE defines whether and how backtraces will be printed for every
+ roundtrip. If not set, only total number of roundtrips is printed after the process
+ exits. If set to a number, backtrace for every roundtrip will be printed, and the
+ backtraces will be as deep as the given number. If set to C<number> (e.g. C10),
+ the backtraces will be "compressed" - every backtrace will be printed only once
+ after the process exits, together with number of times it occured.
+
+*/
+
+#define _GNU_SOURCE
+#include <dlfcn.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <execinfo.h>
+#include <assert.h>
+#include <X11/Xlibint.h>
+
+/* Since these symbols are weak, the apps can provide their own, and therefore
+ e.g. temporarily suspend counting of roundtrips. At least theoretically,
+ I haven't really tried it.
+*/
+__attribute((weak)) long ___xreply_reply_count = 0;
+__attribute((weak)) int ___xreply_reply_enabled = 1;
+
+#define MAX_BACKTRACES 1024
+
+extern long ___xreply_reply_count;
+extern int ___xreply_reply_enabled;
+
+typedef Status (*xreply_ptr_t)(Display*,xReply*,int,Bool);
+
+static xreply_ptr_t xreply_ptr = NULL;
+static int xreply_backtrace_set = 0;
+static int xreply_backtrace_type = 0;
+
+struct xreply_struct
+ {
+ char* key;
+ char* text;
+ int count;
+ };
+static struct xreply_struct backtraces[ MAX_BACKTRACES ];
+static int backtraces_size = 0;
+
+static int xreply_compare( const void* left, const void* right )
+ {
+ int left_count = ((struct xreply_struct*)left)->count;
+ int right_count = ((struct xreply_struct*)right)->count;
+ return right_count - left_count;
+ }
+
+static void xreply_print(void)
+ {
+ char tmp[ 1024 ];
+ int fd;
+ fd = open( "/proc/self/cmdline", O_RDONLY );
+ if( fd >= 0 )
+ {
+ read( fd, tmp, 1024 );
+ tmp[ 1023 ] = '\0';
+ close( fd );
+ }
+ fprintf( stderr, "XREPLY (%d : %s): %ld\n", getpid(), tmp, ___xreply_reply_count );
+ if( xreply_backtrace_type < 0 )
+ {
+ int i;
+ qsort( backtraces, backtraces_size, sizeof( struct xreply_struct ), xreply_compare );
+ for( i = 0;
+ i < backtraces_size;
+ ++i )
+ fprintf( stderr, "%d:%s\n\n", backtraces[ i ].count, backtraces[ i ].text );
+ }
+ }
+
+static void xreply_backtrace()
+ {
+ void* trace[256];
+ int n = backtrace(trace, 256);
+ char** strings = backtrace_symbols (trace, n);
+
+ if( xreply_backtrace_type > 0 )
+ {
+ fprintf( stderr, "%ld [\n", ___xreply_reply_count );
+ if( n > xreply_backtrace_type )
+ n = xreply_backtrace_type;
+ int i;
+ for( i = 0;
+ i < n;
+ ++i )
+ fprintf( stderr, "%d: %s\n", i, strings[ i ] );
+ fprintf( stderr, "]\n" );
+ }
+ else
+ {
+ char stack[ 256 * 20 ];
+ int pos = 0;
+ int i;
+ stack[ 0 ] = '\0';
+ if( n > -xreply_backtrace_type )
+ n = -xreply_backtrace_type;
+ for( i = 0;
+ i < n;
+ ++i )
+ {
+ const char* start = strrchr( strings[ i ], '[' );
+ if( start == NULL )
+ assert( !"No [ in address." );
+ long addr;
+ if( sscanf( start + 1, "0x%lx", &addr ) != 1 )
+ assert( !"Failed to parse address." );
+ if( sizeof( void* ) == 4 )
+ {
+ sprintf( stack + pos, "0x%8lx", addr );
+ pos += 10;
+ }
+ else if( sizeof( void* ) == 8 )
+ {
+ sprintf( stack + pos, "0x%16lx", addr );
+ pos += 18;
+ }
+ else
+ assert( !"Unknown sizeof( void* )." );
+ }
+ for( i = 0;
+ i < backtraces_size;
+ ++i )
+ if( strcmp( backtraces[ i ].key, stack ) == 0 )
+ {
+ ++backtraces[ i ].count;
+ break;
+ }
+ if( i == backtraces_size )
+ {
+ int stack_text_size = 10;
+ char* stack_text;
+ char* stack_text_pos;
+ for( i = 0;
+ i < n;
+ ++i )
+ stack_text_size += strlen( strings[ i ] ) + 5;
+ stack_text = stack_text_pos = malloc( stack_text_size );
+ for( i = 0;
+ i < n;
+ ++i )
+ {
+ stack_text_pos = stpcpy( stack_text_pos, "\n" );
+ stack_text_pos = stpcpy( stack_text_pos, strings[ i ] );
+ }
+ backtraces[ backtraces_size ].key = strdup( stack );
+ backtraces[ backtraces_size ].text = stack_text;
+ backtraces[ backtraces_size ].count = 1;
+ ++backtraces_size;
+ if( backtraces_size >= MAX_BACKTRACES )
+ assert( !"MAX_BACKTRACES reached." );
+ }
+ }
+ free (strings);
+ }
+
+Status
+_XReply (dpy, rep, extra, discard)
+ register Display *dpy;
+ register xReply *rep;
+ int extra; /* number of 32-bit words expected after the reply */
+ Bool discard; /* should I discard data following "extra" words? */
+ {
+ if( ___xreply_reply_enabled )
+ ++___xreply_reply_count;
+ if( xreply_backtrace_set == 0 )
+ {
+ if( getenv( "XREPLY_BACKTRACE" ) != NULL )
+ { // C<number> - compress backtraces, saved as negative value in xreply_backtrace_type
+ if( getenv( "XREPLY_BACKTRACE" )[ 0 ] == 'C' )
+ xreply_backtrace_type = -atoi( getenv( "XREPLY_BACKTRACE" ) + 1 );
+ else // <number> - print the backtrace every time
+ xreply_backtrace_type = atoi( getenv( "XREPLY_BACKTRACE" ));
+ }
+ else
+ xreply_backtrace_type = 0;
+ }
+ if( xreply_backtrace_type != 0 )
+ xreply_backtrace();
+ if( xreply_ptr == NULL )
+ {
+ xreply_ptr = (xreply_ptr_t)dlsym( RTLD_NEXT, "_XReply" );
+ if( xreply_ptr == NULL )
+ assert( !"dlsym() failed." );
+ atexit( xreply_print );
+ }
+ return xreply_ptr( dpy, rep, extra, discard );
+ }