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问 我用IAR的编译器编译后，产生了相应的.S43文件：

NAME main

RTMODEL "__double_size", "32"
RTMODEL "__PIC", "no"

RSEG CSTACK:DATA:SORT:NOROOT(1)

EXTERN ?cstart_init_zero
EXTERN ?longjmp_r4

PUBWEAK ?setjmp_save_r4
PUBWEAK ?setjmp_save_r5
PUBWEAK WDTCTL
PUBLIC c
PUBLIC cconst
PUBLIC f
PUBLIC i
PUBLIC iconst
PUBLIC l
PUBLIC main
FUNCTION main,021a03H
LOCFRAME CSTACK, 6, STACK

CFI Names cfiNames0
CFI StackFrame CFA SP DATA
CFI Resource PC:16, SP:16, SR:16, R4:16, R5:16, R6:16, R7:16, R8:16
CFI Resource R9:16, R10:16, R11:16, R12:16, R13:16, R14:16, R15:16
CFI EndNames cfiNames0

CFI Common cfiCommon0 Using cfiNames0
CFI CodeAlign 2
CFI DataAlign 2
CFI ReturnAddress PC CODE
CFI CFA SP+2
CFI PC Frame(CFA, -2)
CFI SR Undefined
CFI R4 SameValue
CFI R5 SameValue
CFI R6 SameValue
CFI R7 SameValue
CFI R8 SameValue
CFI R9 SameValue
CFI R10 SameValue
CFI R11 SameValue
CFI R12 Undefined
CFI R13 Undefined
CFI R14 Undefined
CFI R15 Undefined
CFI EndCommon cfiCommon0

EXTERN _Mul32f
FUNCTION _Mul32f,0202H
EXTERN _Cast32sto32f
FUNCTION _Cast32sto32f,0202H
EXTERN _Div32f
FUNCTION _Div32f,0202H
EXTERN _Cast32fto32s
FUNCTION _Cast32fto32s,0202H

上面的一些关键词比如：NAME 、RSEG、EXTERN 、PUBLIC的一以我是知道的，但其他的比如：
RTMODEL "__double_size", "32"
PUBWEAK ?setjmp_save_r5
PUBWEAK WDTCTL
FUNCTION main,021a03H
LOCFRAME CSTACK, 6, STACK
CFI Names cfiNames0
CFI StackFrame CFA SP DATA
CFI Resource PC:16, SP:16, SR:16, R4:16, R5:16, R6:16, R7:16, R8:16

分别代表什么呢？ 希望有高手予以指点，那怕只指出其中一个关键词的意义也行阿。

bow～～