From da7b87cb80fbeaf95da64250f833a12b8b882bd4 Mon Sep 17 00:00:00 2001
From: Rudolf Polzer <rpolzer@nb-04.(none)>
Date: Wed, 13 Jan 2010 12:32:17 +0100
Subject: [PATCH] win32 specific code start (not done)

---
 sys_shared.c | 62 ++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 45 insertions(+), 17 deletions(-)

diff --git a/sys_shared.c b/sys_shared.c
index 3ed83da2..c0d96ad9 100644
--- a/sys_shared.c
+++ b/sys_shared.c
@@ -25,11 +25,52 @@ char *Sys_TimeString(const char *timeformat)
 	return sys_timestring;
 }
 
-#if defined(__linux__)
+#if defined(__linux__) || defined(MACOSX)
+
+#include <execinfo.h>
+static void Sys_Backtrace(void)
+{
+	void *tracebuf[64];
+	int n = backtrace(tracebuf, sizeof(tracebuf) / sizeof(*tracebuf));
+	char **trace = backtrace_symbols(tracebuf, n);
+	int i;
+	Con_Printf("Backtrace:\n");
+	for(i = 0; i < n; ++i)
+		Con_Printf("%2d: %s\n", i, trace[i]);
+}
+
+#elif defined(WIN32)
+
+// http://gcc.gnu.org/ml/java/2002-04/msg00331.html
+int backtrace (void **__array, int __size)
+{
+	register void *_ebp __asm__ ("ebp");
+	register void *_esp __asm__ ("esp");
+	unsigned int *rfp;
+	int i=0;
+	for (rfp = *(unsigned int**)_ebp; rfp && i < __size; rfp = *(unsigned int **)rfp)
+	{
+		int diff = *rfp - (unsigned int)rfp;
+		if ((void*)rfp < _esp || diff > 4 * 1024 || diff < 0)
+			break;
+		__array[i++] = (void*)(rfp[1]-4);
+	}
+	return i;
+}
+
+static void Sys_Backtrace(void)
+{
+	void *tracebuf[64];
+	int n = backtrace(tracebuf, sizeof(tracebuf) / sizeof(*tracebuf));
+	char **trace = backtrace_symbols(tracebuf, n);
+	int i;
+	Con_Printf("Backtrace:\n");
+	for(i = 0; i < n; ++i)
+		Con_Printf("%2d: %s\n", i, trace[i]);
+}
+
+#elif 0
 
-#if 0
-// dladdr way
-// may be compatible to more systems
 #define _GNU_SOURCE
 #include <dlfcn.h>
 static qboolean Sys_PrintSymbol(void *addr)
@@ -55,19 +96,6 @@ void Sys_Backtrace(void) // this function must not be static so gcc can export i
 			if(Sys_PrintSymbol(a[i]))
 				return;
 }
-#else
-#include <execinfo.h>
-static void Sys_Backtrace(void)
-{
-	void *tracebuf[64];
-	int n = backtrace(tracebuf, sizeof(tracebuf) / sizeof(*tracebuf));
-	char **trace = backtrace_symbols(tracebuf, n);
-	int i;
-	Con_Printf("Backtrace:\n");
-	for(i = 0; i < n; ++i)
-		Con_Printf("%2d: %s\n", i, trace[i]);
-}
-#endif
 
 #else
 
-- 
2.39.2