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#ifndef COMPILER_H
#define COMPILER_H
/* We export the symbol obj_OBJECT (OBJECT is defined on command-line)
* as a global symbol, so that the linker can drag in selected object
* files from the library using -u obj_OBJECT.
*
* Not quite sure why cpp requires two levels of macro call in order
* to actually expand OBJECT...
*/
#undef _H1
#define _H1( x, y ) x ## y
#undef _H2
#define _H2( x, y ) _H1 ( x, y )
#define PREFIX_OBJECT(prefix) _H2 ( prefix, OBJECT )
#define OBJECT_SYMBOL PREFIX_OBJECT(obj_)
#undef _STR
#define _STR(s) #s
#undef _XSTR
#define _XSTR(s) _STR(s)
#define OBJECT_SYMBOL_STR _XSTR ( OBJECT_SYMBOL )
#ifdef ASSEMBLY
.globl OBJECT_SYMBOL
.equ OBJECT_SYMBOL, 0
#else /* ASSEMBLY */
__asm__ ( ".globl\t" OBJECT_SYMBOL_STR );
__asm__ ( ".equ\t" OBJECT_SYMBOL_STR ", 0" );
/*
* Macro to allow objects to explicitly drag in other objects by
* object name. Used by config.c.
*
*/
#define REQUIRE_OBJECT(object) \
__asm__ ( ".equ\tneed_" #object ", obj_" #object );
/*
* If debug_OBJECT is set to a true value, the macro DBG(...) will
* expand to printf(...) when compiling OBJECT, and the symbol
* DEBUG_LEVEL will be inserted into the object file.
*
*/
#define DEBUG_SYMBOL PREFIX_OBJECT(debug_)
#if DEBUG_SYMBOL
#include "console.h"
#define DEBUG_SYMBOL_STR _XSTR ( DEBUG_SYMBOL )
__asm__ ( ".equ\tDEBUG_LEVEL, " DEBUG_SYMBOL_STR );
#endif
#define DBG_PRINT(...) printf ( __VA_ARGS__ )
#define DBG_DISCARD(...)
#define DBG DBG_DISCARD
#define DBG2 DBG_DISCARD
#if DEBUG_SYMBOL >= 1
#undef DBG
#define DBG DBG_PRINT
#endif
#if DEBUG_SYMBOL >= 2
#undef DBG2
#define DBG2 DBG_PRINT
#endif
#define PACKED __attribute__((packed))
#define __unused __attribute__((unused))
#define __used __attribute__((used))
/*
* To save space in the binary when multiple-driver images are
* compiled, uninitialised data areas can be shared between drivers.
* This will typically be used to share statically-allocated receive
* and transmit buffers between drivers.
*
* Use as e.g.
*
* struct {
* char rx_buf[NUM_RX_BUF][RX_BUF_SIZE];
* char tx_buf[TX_BUF_SIZE];
* } my_static_data __shared;
*
*/
#define __shared __asm__ ( "_shared_bss" );
#endif /* ASSEMBLY */
#endif /* COMPILER_H */
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