Added ability to break into debugger on Windows and Mac

internal/catch_debugger.hpp

@@ -0,0 +1,87 @@
+/*
+ *  catch_debugger.hpp
+ *  Catch
+ *
+ *  Created by Phil on 27/12/2010.
+ *  Copyright 2010 Two Blue Cubes Ltd. All rights reserved.
+ *
+ *  Distributed under the Boost Software License, Version 1.0. (See accompanying
+ *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * Provides a DebugBreak() macro for platforms other than Windows
+ * (currently only Macs are supported)
+ */
+
+#ifndef TWOBLUECUBES_CATCH_DEBUGGER_HPP_INCLUDED
+#define TWOBLUECUBES_CATCH_DEBUGGER_HPP_INCLUDED
+
+#if defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__)
+
+    #include <assert.h>
+    #include <stdbool.h>
+    #include <sys/types.h>
+    #include <unistd.h>
+    #include <sys/sysctl.h>
+
+    namespace Catch
+    {
+        // The following function is taken directly from the following technical note:
+        // http://developer.apple.com/library/mac/#qa/qa2004/qa1361.html
+            
+        inline bool AmIBeingDebugged(void)
+        // Returns true if the current process is being debugged (either
+        // running under the debugger or has a debugger attached post facto).
+        {
+            int                 junk;
+            int                 mib[4];
+            struct kinfo_proc   info;
+            size_t              size;
+            
+            // Initialize the flags so that, if sysctl fails for some bizarre
+            // reason, we get a predictable result.
+            
+            info.kp_proc.p_flag = 0;
+            
+            // Initialize mib, which tells sysctl the info we want, in this case
+            // we're looking for information about a specific process ID.
+            
+            mib[0] = CTL_KERN;
+            mib[1] = KERN_PROC;
+            mib[2] = KERN_PROC_PID;
+            mib[3] = getpid();
+            
+            // Call sysctl.
+            
+            size = sizeof(info);
+            junk = sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &size, NULL, 0);
+            assert(junk == 0);
+            
+            // We're being debugged if the P_TRACED flag is set.
+            
+            return ( (info.kp_proc.p_flag & P_TRACED) != 0 );
+        }        
+    }
+
+    // The following code snippet taken from:
+    // http://cocoawithlove.com/2008/03/break-into-debugger.html
+    #ifdef DEBUG
+        #if __ppc64__ || __ppc__
+            #define DebugBreak() \
+            if( Catch::AmIBeingDebugged() ) \
+            { \
+            __asm__("li r0, 20\nsc\nnop\nli r0, 37\nli r4, 2\nsc\nnop\n" \
+            : : : "memory","r0","r3","r4" ); \
+            }
+        #else
+            #define DebugBreak() if( Catch::AmIBeingDebugged() ) {__asm__("int $3\n" : : );}
+        #endif
+    #endif
+
+#endif
+
+#ifndef DebugBreak
+    #define DebugBreak()
+#endif
+
+
+#endif // TWOBLUECUBES_CATCH_DEBUGGER_HPP_INCLUDED