How cpp deal with #abi(n32) ?

Pan ruochen panruochen@gmail.com
Mon Nov 17 13:25:00 GMT 2008


Hi All,

There is a header file in my project:

/*regdef.h : MIPS Rx000 symbolic register names for assembler*/
#define zero $0
#define AT	$1
#define v0 	$2
#define v1	$3
#define a0	$4
#define a1	$5
#define a2	$6
#define	a3	$7
#if #abi(n32) || #abi(n64) || #abi(64) || #abi(eabi)
#define a4	$8
#define a5	$9
#define a6	$10
#define	a7	$11
#define t0	$12
#define t1	$13
#define t2	$14
#define t3	$15
#define ta0	$8	/* alias for $a4 */
#define ta1	$9	/* alias for $a5 */
#define ta2	$10	/* alias for $a6 */
#define ta3	$11	/* alias for $a7 */
#else
#define t0	$8
#define t1	$9
#define t2	$10
#define t3	$11
#define t4	$12
#define t5	$13
#define t6	$14
#define t7	$15
#define ta0	$12	/* alias for $t4 */
#define ta1	$13	/* alias for $t5 */
#define ta2	$14	/* alias for $t6 */
#define ta3	$15	/* alias for $t7 */
#endif
#define s0	$16
#define s1	$17
#define s2	$18
#define s3	$19
#define s4	$20
#define s5	$21
#define s6	$22
#define s7	$23
#define s8	$30		/* == fp */
#define t8	$24
#define t9	$25
#define k0	$26
#define k1	$27
#define gp	$28
#define sp	$29
#define fp	$30
#define ra	$31

I can't find any explaination for the syntax '#abi(n32)' in gcc
manual. But gcc can still process this header file and takes the #else
branch during compilation.
So, how gcc deal with this header file?

Best Regards,
PRC
Nov 17, 2008



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