Epson S5U1C63000A 4.7.15 Comment Adding Function, 4.7.16 Priority of Pseudo-Instructions, #ifdef, #macro, #macro, #ifndef, #define, #define, #include, #include

CHAPTER 4: ASSEMBLER

4.7.15 Comment Adding Function

The preprocessing pseudo-instructions that begin with "#" are all expanded to codes that can be as- sembled, and delivered in the preprocessed file. Even after that, those instructions are rewritten with comments beginning with a semicolon (;), so that the original instructions can be identified. However, note that the replacements of Define names will not subsist as comments.

The comment is added to the first line following the expansion. In case the original statement is accompanied by a comment, that comment is also added.

A macro definition should have a semicolon (;) placed at top of the line.

Example:

• Before expansion

#define	Areg	%a
#macro	ADDX2Y	VALUE
	ld	Areg, VALUE
	add	Areg, [%x]
	ld	[%y], Areg
#endm
	ADDX2Y	10h ; MX + 10h -> MY
• After expansion (no debugging information)
;#define	Areg	%a
;#macro	ADDX2Y	VALUE
;	ld	Areg, VALUE
;	add	Areg, [%x]
;	ld	[%y], Areg
;#endm
	;ADDX2Y	10h ; MX + 10h -> MY
	ld	%a, 0x10
	add	%a, [%x]
	ld	[%y], %a

4.7.16 Priority of Pseudo-Instructions

Some remarks concerning the priority among the preprocessing pseudo-instructions will be given below:

1.The conditional assembly instructions (#ifdef, #ifndef) have the first priority. Nesting cannot be made of those instructions.

2.Define instruction (#define), include instruction (#include), or macro instruction (#macro) can be described within a conditional assembly instruction.

3.Define instruction (#define), include instruction (#include), and macro instruction (#macro) cannot be described within a macro definition.

4.Define name definitions are expanded with priority over macro definitions.

82	EPSON	S5U1C63000A MANUAL
		(S1C63 FAMILY ASSEMBLER PACKAGE)