From ee4e4a6b964a3a91fcb922d4e82abff62da39102 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Fonseca?= <jfonseca@vmware.com>
Date: Fri, 20 Feb 2009 11:35:23 +0000
Subject: util: Stack backtracing facilities.

Not much useful until we have symbol lookup.
---
 src/gallium/auxiliary/util/u_debug_stack.c | 97 ++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 src/gallium/auxiliary/util/u_debug_stack.c

(limited to 'src/gallium/auxiliary/util/u_debug_stack.c')

diff --git a/src/gallium/auxiliary/util/u_debug_stack.c b/src/gallium/auxiliary/util/u_debug_stack.c
new file mode 100644
index 0000000000..76068a6509
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_debug_stack.c
@@ -0,0 +1,97 @@
+/**************************************************************************
+ * 
+ * Copyright 2009 VMware, Inc.
+ * All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ **************************************************************************/
+
+/**
+ * @file
+ * Stack backtracing.
+ * 
+ * @author Jose Fonseca <jfonseca@vmware.com>
+ */
+
+#include "u_debug.h"
+#include "u_debug_stack.h"
+
+
+void
+debug_backtrace_capture(struct debug_stack_frame *backtrace,
+                        unsigned start_frame, 
+                        unsigned nr_frames)
+{
+   const void **frame_pointer = NULL;
+   unsigned i = 0;
+
+   if(!nr_frames)
+      return;
+
+#if defined(PIPE_CC_GCC)
+   frame_pointer = ((const void **)__builtin_frame_address(1));
+#elif defined(PIPE_CC_MSVC)
+   __asm {
+      mov frame_pointer, ebp
+   }
+   frame_pointer = (const void **)frame_pointer[0];
+#else
+   frame_pointer = NULL;
+#endif
+  
+   
+#ifdef PIPE_ARCH_X86
+   while(nr_frames) {
+      if(!frame_pointer)
+         break;
+      
+      if(start_frame)
+         --start_frame;
+      else {
+         backtrace[i++].function = frame_pointer[1];
+         --nr_frames;
+      }
+      
+      frame_pointer = (const void **)frame_pointer[0];
+   }
+#endif
+   
+   while(nr_frames) {
+      backtrace[i++].function = NULL;
+      --nr_frames;
+   }
+}
+   
+
+void
+debug_backtrace_dump(const struct debug_stack_frame *backtrace, 
+                     unsigned nr_frames)
+{
+   unsigned i;
+   
+   for(i = 0; i < nr_frames; ++i) {
+      if(!backtrace[i].function)
+         break;
+      debug_printf("\t%p\n", backtrace[i].function);
+   }
+}
+
-- 
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