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RealView Assembler User's Guide
Preface Introduction Writing ARM Assembly Language Assembler Reference Command syntax
Obtaining a list of available options Specifying command‑line options with an environm AAPCS Floating‑point model Memory access attributes Pre‑executing a SET directive Splitting long LDMs and STMs Listing output to a file Project template options Controlling the output of diagnostic messages Controlling exception table generation Format of source lines Predefined register and coprocessor names Predeclared register names Predeclared extension register names Predeclared coprocessor names Built‑in variables and constants Symbols Symbol naming rules Variables Numeric constants Assembly time substitution of variables Labels Local labels Expressions, literals, and operators String expressions String literals Numeric expressions Numeric literals Floating‑point literals Register‑relative and program‑relative express Logical expressions Logical literals Operator precedence Unary operators Binary operators Diagnostic messages Interlocks IT block generation Thumb branch target alignment Using the C preprocessor ARM and Thumb Instructions Directives ReferenceSymbol naming rules
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| Home > Assembler Reference > Symbols > Symbol naming rules | |||
The following general rules apply to symbol names:
Symbol names must be unique within their scope.
You can use uppercase letters, lowercase letters, numeric characters, or the underscore character in symbol names. Symbol names are case‑sensitive, and all characters in the symbol name are significant.
Do not use numeric characters for the first character of symbol names, except in local labels (see Local labels).
Symbols must not use the same name as built‑in variable names or predefined symbol names (see Predefined register and coprocessor names and Built‑in variables and constants).
If you use the same name as an instruction mnemonic or directive, use double bars to delimit the symbol name. For example:
||ASSERT||
The bars are not part of the symbol.
You must not use the symbols
|$a|,|$t|,|$t.x|, or|$d|as program labels. These are mapping symbols used to mark ARM, Thumb, ThumbEE, and data within the object file.
If you have to use a wider range of characters in symbols, for example, when working with compilers, use single bars to delimit the symbol name. For example:
|.text|
The bars are not part of the symbol. You cannot use bars, semicolons, or newlines within the bars.
| Copyright © 2007 ARM Limited. All rights reserved. | ARM DUI 0379A |
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