Make a new general RingBuffer.h misc library driver, instead of the per-application...

[pub/USBasp.git] / LUFA / Common / Common.h

diff --git a/LUFA/Common/Common.h b/LUFA/Common/Common.h
index 3860eff..f2e5e31 100644 (file)
--- a/LUFA/Common/Common.h
+++ b/LUFA/Common/Common.h
@@ -85,14 +85,14 @@
                         *
                         *  \ingroup Group_Debugging
                         */
-                       #define JTAG_DEBUG_POINT()      __asm__ volatile ("NOP" ::)
+                       #define JTAG_DEBUG_POINT()      __asm__ __volatile__ ("NOP" ::)
 
                        /** Defines an explicit JTAG break point in the resulting binary via the ASM BREAK statement. When
                         *  a JTAG is used, this causes the program execution to halt when reached until manually resumed.
                         *
                         *  \ingroup Group_Debugging
                         */
-                       #define JTAG_DEBUG_BREAK()      __asm__ volatile ("BREAK" ::)
+                       #define JTAG_DEBUG_BREAK()      __asm__ __volatile__ ("BREAK" ::)
 
                        /** Macro for testing condition "x" and breaking via JTAG_DEBUG_BREAK() if the condition is false.
                         *
@@ -111,6 +111,16 @@
                        #define STDOUT_ASSERT(x)        MACROS{ if (!(x)) { printf_P(PSTR("%s: Function \"%s\", Line %d: "   \
                                                                     "Assertion \"%s\" failed.\r\n"),     \
                                                                     __FILE__, __func__, __LINE__, #x); } }MACROE
+                       
+                       /** Forces GCC to use pointer indirection (via the AVR's pointer register pairs) when accessing the given
+                        *  struct pointer. In some cases GCC will emit non-optimal assembly code when accessing a structure through
+                        *  a pointer, resulting in a larger binary. When this macro is used on a (non-const) structure pointer before
+                        *  use, it will force GCC to use pointer indirection on the elements rather than direct store and load
+                        *  instructions.
+                        *
+                        *  \param[in, out] StructPtr  Pointer to a structure which is to be forced into indirect access mode.
+                        */
+                       #define GCC_FORCE_POINTER_ACCESS(StructPtr) __asm__ __volatile__("" : "=b" (StructPtr) : "0" (StructPtr))
 
                        #if !defined(pgm_read_ptr) || defined(__DOXYGEN__)
                                /** Reads a pointer out of PROGMEM space. This is currently a wrapper for the avr-libc pgm_read_ptr()