Update mach_override to upstream 1a1bb352

third_party/mach_override/mach_override.h

Index: third_party/mach_override/mach_override.h
diff --git a/third_party/mach_override/mach_override.h b/third_party/mach_override/mach_override.h
index 76fdb1bbdfc633507b1c8109ae3f4982c69f3df9..ecd319c1cd7a899032e084fc34f32f93cd1d39f7 100644
--- a/third_party/mach_override/mach_override.h
+++ b/third_party/mach_override/mach_override.h
@@ -1,46 +1,7 @@
-/*******************************************************************************
-	mach_override.h
-		Copyright (c) 2003-2009 Jonathan 'Wolf' Rentzsch: <http://rentzsch.com>
-		Some rights reserved: <http://opensource.org/licenses/mit-license.php>
-
-	***************************************************************************/
-
-/***************************************************************************//**
-	@mainpage	mach_override
-	@author		Jonathan 'Wolf' Rentzsch: <http://rentzsch.com>
-	
-	This package, coded in C to the Mach API, allows you to override ("patch")
-	program- and system-supplied functions at runtime. You can fully replace
-	functions with your implementations, or merely head- or tail-patch the
-	original implementations.
-	
-	Use it by #include'ing mach_override.h from your .c, .m or .mm file(s).
-	
-	@todo	Discontinue use of Carbon's MakeDataExecutable() and
-			CompareAndSwap() calls and start using the Mach equivalents, if they
-			exist. If they don't, write them and roll them in. That way, this
-			code will be pure Mach, which will make it easier to use everywhere.
-			Update: MakeDataExecutable() has been replaced by
-			msync(MS_INVALIDATE). There is an OSCompareAndSwap in libkern, but
-			I'm currently unsure if I can link against it. May have to roll in
-			my own version...
-	@todo	Stop using an entire 4K high-allocated VM page per 28-byte escape
-			branch island. Done right, this will dramatically speed up escape
-			island allocations when they number over 250. Then again, if you're
-			overriding more than 250 functions, maybe speed isn't your main
-			concern...
-	@todo	Add detection of: b, bl, bla, bc, bcl, bcla, bcctrl, bclrl
-			first-instructions. Initially, we should refuse to override
-			functions beginning with these instructions. Eventually, we should
-			dynamically rewrite them to make them position-independent.
-	@todo	Write mach_unoverride(), which would remove an override placed on a
-			function. Must be multiple-override aware, which means an almost
-			complete rewrite under the covers, because the target address can't
-			be spread across two load instructions like it is now since it will
-			need to be atomically updatable.
-	@todo	Add non-rentry variants of overrides to test_mach_override.
-
-	***************************************************************************/
+// mach_override.h semver:1.2.0
+//   Copyright (c) 2003-2012 Jonathan 'Wolf' Rentzsch: http://rentzsch.com
+//   Some rights reserved: http://opensource.org/licenses/mit
+//   https://github.com/rentzsch/mach_override
 
 #ifndef		_mach_override_
 #define		_mach_override_
@@ -48,16 +9,11 @@
 #include <sys/types.h>
 #include <mach/error.h>
 
-#ifdef	__cplusplus
-	extern	"C"	{
-#endif
-
-/**
-	Returned if the function to be overrided begins with a 'mfctr' instruction.
-*/
 #define	err_cannot_override	(err_local|1)
 
-/************************************************************************************//**
+__BEGIN_DECLS
+
+/****************************************************************************************
 	Dynamically overrides the function implementation referenced by
 	originalFunctionAddress with the implentation pointed to by overrideFunctionAddress.
 	Optionally returns a pointer to a "reentry island" which, if jumped to, will resume
@@ -81,41 +37,40 @@ mach_override_ptr(
     const void *overrideFunctionAddress,
     void **originalFunctionReentryIsland );
 
-/************************************************************************************//**
-	
+__END_DECLS
+
+/****************************************************************************************
+	If you're using C++ this macro will ease the tedium of typedef'ing, naming, keeping
+	track of reentry islands and defining your override code. See test_mach_override.cp
+	for example usage.
 
 	************************************************************************************/
  
 #ifdef	__cplusplus
+#define MACH_OVERRIDE( ORIGINAL_FUNCTION_RETURN_TYPE, ORIGINAL_FUNCTION_NAME, ORIGINAL_FUNCTION_ARGS, ERR )		\
+{																												\
+	static ORIGINAL_FUNCTION_RETURN_TYPE (*ORIGINAL_FUNCTION_NAME##_reenter)ORIGINAL_FUNCTION_ARGS;				\
+	static bool ORIGINAL_FUNCTION_NAME##_overriden = false;														\
+	class mach_override_class__##ORIGINAL_FUNCTION_NAME {														\
+	public:																										\
+		static kern_return_t override(void *originalFunctionPtr) {												\
+			kern_return_t result = err_none;																	\
+			if (!ORIGINAL_FUNCTION_NAME##_overriden) {															\
+				ORIGINAL_FUNCTION_NAME##_overriden = true;														\
+				result = mach_override_ptr( (void*)originalFunctionPtr,											\
+											(void*)mach_override_class__##ORIGINAL_FUNCTION_NAME::replacement,	\
+											(void**)&ORIGINAL_FUNCTION_NAME##_reenter );						\
+			}																									\
+			return result;																						\
+		}																										\
+		static ORIGINAL_FUNCTION_RETURN_TYPE replacement ORIGINAL_FUNCTION_ARGS {
 
-#define MACH_OVERRIDE( ORIGINAL_FUNCTION_RETURN_TYPE, ORIGINAL_FUNCTION_NAME, ORIGINAL_FUNCTION_ARGS, ERR )			\
-	{																												\
-		static ORIGINAL_FUNCTION_RETURN_TYPE (*ORIGINAL_FUNCTION_NAME##_reenter)ORIGINAL_FUNCTION_ARGS;				\
-		static bool ORIGINAL_FUNCTION_NAME##_overriden = false;														\
-		class mach_override_class__##ORIGINAL_FUNCTION_NAME {														\
-		public:																										\
-			static kern_return_t override(void *originalFunctionPtr) {												\
-				kern_return_t result = err_none;																	\
-				if (!ORIGINAL_FUNCTION_NAME##_overriden) {															\
-					ORIGINAL_FUNCTION_NAME##_overriden = true;														\
-					result = mach_override_ptr( (void*)originalFunctionPtr,											\
-												(void*)mach_override_class__##ORIGINAL_FUNCTION_NAME::replacement,	\
-												(void**)&ORIGINAL_FUNCTION_NAME##_reenter );						\
-				}																									\
-				return result;																						\
-			}																										\
-			static ORIGINAL_FUNCTION_RETURN_TYPE replacement ORIGINAL_FUNCTION_ARGS {
-
-#define END_MACH_OVERRIDE( ORIGINAL_FUNCTION_NAME )																	\
-			}																										\
-		};																											\
-																													\
-		err = mach_override_class__##ORIGINAL_FUNCTION_NAME::override((void*)ORIGINAL_FUNCTION_NAME);				\
-	}
- 
+#define END_MACH_OVERRIDE( ORIGINAL_FUNCTION_NAME )																\
+		}																										\
+	};																											\
+																												\
+	err = mach_override_class__##ORIGINAL_FUNCTION_NAME::override((void*)ORIGINAL_FUNCTION_NAME);				\
+}
 #endif
 
-#ifdef	__cplusplus
-	}
-#endif
 #endif	//	_mach_override_