| ||||
| Home Products Download Events Support | ||||
Technical Support
On-Line Manuals
A166 User's Guide
A166 Introduction Assembling Programs Operands and Expressions Operators Control Statements 
Macro Processor Standard Macro Processor 
Standard Macro Controls Defining Standard Macros Calling Standard Macros Local Symbols Exiting A Macro Built-in Macros REPT IRP IRPC Standard Macro Operators NUL Operator & Operator < and > Operators % Operator ;; Operator ! Operator MPL Macro Processor MPL Macro Overview MPL Meta Character Defining MPL Macros Calling MPL Macros Local Symbols Expressions Common Functions Bracket Function Comment Function Escape Function METACHAR Function SET Function EVAL Function Comparison Functions Conditional Functions EXIT Function IF Function REPEAT Function WHILE Function Console I/O Functions String Functions LEN Function MATCH Function SUBSTR Function Advanced Literal Delimiters Blank Delimiters Identifier Delimiters Literal and Normal Modes Errors Error Messages AppendixLocal Symbols
MPL macros may include local labels that are the targets of branches. Fixed label names cause errors if the macro is called more than once. This happens because the same label name may be used only once in a source file. This problem may be solved by using local symbols. Local macro symbols are appended with a unique, sequential number that increments each time the macro is invoked.
Local symbols must be declared in the macro definition line:
%*DEFINE (macro-name <[>parameter-list<]>) <[>LOCAL local-list<]> (macro-body)
where the local-list is a list (separated by commas or spaces) of the macro's local symbols.
Local symbols must be prefixed with the meta character when they are used in the macro macro-body. For example:
%*DEFINE (BMOVE (src, dst, cnt)) LOCAL lab (
MOV R2,#%cnt
MOV R1,#%src
MOV R0,#%dst
%lab: MOVB [R0+],[R1]
ADD R1,#1
CMPD1 R2,#0
JMP CC_NZ, %lab
)
| Contact Site Map Press Privacy | Copyright © 2012 ARM Ltd and ARM Germany GmbH. All rights reserved. |
