Issuetracker : #i56946#
CWS          : N/A
Author       : <maho@openoffice.org> (JCA)
Description  : FreeBSD porting : An implementation of backtrace at sal/osl/unx
To pass the compilation, we had been preparing dummy function at sal.
We implemented this.

--- sal/osl/unx/backtrace.c	Thu Sep  8 23:52:44 2005
+++ sal/osl/unx/backtrace.c	Sun Oct 23 09:19:04 2005
@@ -129,6 +129,7 @@
 #include <pthread.h>
 #include <setjmp.h>
 #include <stdio.h>
+#include <stddef.h>
 #include "backtrace.h"
 
 #define FRAME_PTR_OFFSET 1
@@ -136,11 +137,55 @@
 
 int backtrace( void **buffer, int max_frames )
 {
-	return 1;
+	struct frame *fp;
+	jmp_buf ctx;
+	int i;
+	/* get stack- and framepointer */
+	setjmp(ctx);
+	fp = (struct frame*)(((size_t*)(ctx))[FRAME_PTR_OFFSET]);
+	for ( i=0; (i<FRAME_OFFSET) && (fp!=0); i++)
+		fp = fp->fr_savfp;
+	/* iterate through backtrace */
+	for (i=0; fp && fp->fr_savpc && i<max_frames; i++)
+	{
+		/* store frame */
+		*(buffer++) = (void *)fp->fr_savpc;
+		/* next frame */
+		fp=fp->fr_savfp;
+	}
+	return i;
 }
 
 void backtrace_symbols_fd( void **buffer, int size, int fd )
 {
+	FILE	*fp = fdopen( fd, "w" );
+
+	if ( fp )
+	{
+		void **pFramePtr;
+		for ( pFramePtr = buffer; size > 0 && pFramePtr && *pFramePtr; pFramePtr++, size-- )
+		{
+			Dl_info		dli;
+			ptrdiff_t	offset;
+
+			if ( 0 != dladdr( *pFramePtr, &dli ) )
+			{
+				if ( dli.dli_fname && dli.dli_fbase )
+				{
+					offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_fbase;
+					fprintf( fp, "%s+0x%x", dli.dli_fname, offset );
+				}
+				if ( dli.dli_sname && dli.dli_saddr )
+				{
+					offset = (ptrdiff_t)*pFramePtr - (ptrdiff_t)dli.dli_saddr;
+					fprintf( fp, "(%s+0x%x)", dli.dli_sname, offset );
+				}
+			}
+			fprintf( fp, "[0x%x]\n", *pFramePtr );
+		}
+		fflush( fp );
+		fclose( fp );
+	}
 
 }
 #endif /* defined FREEBSD */

--- sal/osl/unx/backtrace.h	Thu Sep  8 23:52:59 2005
+++ sal/osl/unx/backtrace.h	Sun Oct 23 09:19:40 2005
@@ -46,6 +46,16 @@
 
 void backtrace_symbols_fd( void **buffer, int size, int fd );
 
+/* no frame.h on FreeBSD */
+#if defined FREEBSD
+struct frame {
+	long	arg0[8];
+	long	arg1[6];
+	struct frame *fr_savfp;
+	long	fr_savpc;
+};
+#endif
+
 #ifdef __cplusplus
 } /* extern "C" */
 #endif