Chapter 11 Writing Macro Control Statements
Forced Termination of Macro Expansion (exitm) 215
11.6 Forced Termination of Macro Expansion
(exitm)
Syntax
macro_name
macro
parameter
#ifndef
identifier
exitm
#endif
.
.
.
endm
Functional description
The exitm directive forcibly terminates macro expansion at the point it appears. Used in conjunction
with an #ifndef directive, it can end macro expansion if an identifier is undefined. If the identifier has
been defined, expansion beyond #endif will be performed. (The conditions are reversed when #ifdef is
used.)
Coding rules
In addition to #ifdef–#endif, all directives listed in chapter 10 "Writing Assembler Control Statements"
section 10.5, “Conditional Assembly”, can be used.
The exitm directive can be used at any location. The assembler will terminate macro expansion after it
appears.
The exitm directive can only be used within macro definitions.
Usage example
Usage example with #ifb directive
A source file is shown below. The identifier TEST is used for the condition. In main the first macro call
is made with TEST undefined. This causes exitm to be executed, so jsr debug will not be expanded.
TEST is defined before the second macro call, so here the statements after #endif will be assembled.
Содержание PanaXSeries MN1030 Series
Страница 1: ...MICROCOMPUTER MN1030 MN1030 Series Cross Assembler User s Manual Pub No 13110 120E ...
Страница 2: ......
Страница 13: ...1 Chapter 1 Getting Started ...
Страница 25: ...2 Chapter 2 Program Development Flow ...
Страница 32: ...Chapter 2 Program Development Flow 20 Programming with Assembler ...
Страница 33: ...3 Chapter 3 Introduction to Operation ...
Страница 54: ...Chapter 3 Introduction to Operation 42 Conditional Assembly and Linking ...
Страница 55: ...4 Chapter 4 Optimization ...
Страница 71: ...5 Chapter 5 Using Assembler ...
Страница 95: ...6 Chapter 6 Using Linker ...
Страница 128: ...Chapter 6 Using Linker 116 Instruction RAM Support ...
Страница 129: ...7 Chapter 7 Types of Source Statements ...
Страница 138: ...Chapter 7 Type of Source Statements 126 Blank Statements ...
Страница 139: ...8 Chapter 8 Writing Source Statements ...
Страница 157: ...9 Chapter 9 Writing Machine Language Instruction Statements and Directive Statements ...
Страница 192: ...Chapter 9 Writing Machine Language Instructions and Directive Statements 180 Writing Directive Statements ...
Страница 193: ...10 Chapter 10 Writing Assembler Control Statements ...
Страница 217: ...11 Chapter 11 Writing Macro Control Statements ...
Страница 236: ...Chapter 11 Writing Macro Control Statements 224 irpc ...
Страница 237: ...12 Chapter 12 List of Machine Language Instructions ...
Страница 261: ...13 Chapter 13 Error Messages ...
Страница 276: ...Chapter 13 Error Messages 264 Linker Errors ...
Страница 277: ...14 Chapter 14 Readinig List Files ...
Страница 285: ...15 Chapter 15 Using Library Manager ...
Страница 309: ...16 Chapter 16 Notes on Operating Environment ...
Страница 321: ...17 Chapter 17 Appendix ...
Страница 338: ... 4 Index ...