ARM Diagnostic Directives

9/7/2007

The following ARM assembly directives generate diagnostic information.

Directive Syntax Description

Directive	Syntax	Description
ASSERT	`ASSERT logical-expression`	Supports diagnostic generation. If logical-expression returns FALSE, the assembler generates a diagnostic message during the second pass of the assembly. `ASSERT` can be used inside and outside macros.
!	`! arithmetic-expression, string-expression`	Related to `ASSERT`, but is inspected on both passes of the assembly, providing a more flexible means for creating custom error messages. If arithmetic-expression equals 0, the assembler takes no action during pass one, but prints string-expression as a warning during pass two. If arithmetic-expression does not equal 0, the assembler prints string-expression as a diagnostic message. The assembly halts after pass one. This directive is identical to the `INFO` directive.
INFO	`INFO arithmetic-expression, string-expression`	If arithmetic-expression equals 0, the assembler takes no action during pass one. It adds source file and line number as a prefix to string-expression, and prints the result as a warning during pass two. If arithmetic-expression does not equal 0, the assembler prints string-expression as a diagnostic message. The assembly halts after pass one. This directive is identical to the `!` directive.

ASSERT

ASSERT logical-expression

Supports diagnostic generation.

If logical-expression returns FALSE, the assembler generates a diagnostic message during the second pass of the assembly.

ASSERT can be used inside and outside macros.

! arithmetic-expression, string-expression

Related to ASSERT, but is inspected on both passes of the assembly, providing a more flexible means for creating custom error messages.

If arithmetic-expression equals 0, the assembler takes no action during pass one, but prints string-expression as a warning during pass two.

If arithmetic-expression does not equal 0, the assembler prints string-expression as a diagnostic message. The assembly halts after pass one.

This directive is identical to the INFO directive.

INFO

INFO arithmetic-expression, string-expression

If arithmetic-expression equals 0, the assembler takes no action during pass one.

It adds source file and line number as a prefix to string-expression, and prints the result as a warning during pass two.

If arithmetic-expression does not equal 0, the assembler prints string-expression as a diagnostic message. The assembly halts after pass one.

This directive is identical to the ! directive.

See Also