Specifications

Compilers, Interpreters, and Assemblers

7.12 MACRO

• Display informational messages

• Control the assembler options that are used to interpret the source program

• Deﬁne new opcodes

VAX MACRO directives deﬁne macros and repeat blocks. With these directives,

you can repeat identical or similar sequences of source statements and use string

operators to manipulate and test the contents of source statements.

7.12.2 VAX MACRO-32 Compiler for OpenVMS AXP

The VAX MACRO-32 Compiler for OpenVMS AXP is available for porting

VAX MACRO code to an OpenVMS AXP system.

Digital recommends the use of mid- and high-level languages for developing new

applications. The VAX MACRO-32 Compiler is provided only for porting existing

VAX MACRO code to OpenVMS AXP systems.

For information about using this compiler, see Migrating to an OpenVMS AXP

System: Porting VAX MACRO Code.

7.12.3 MACRO-64 Assembler for OpenVMS AXP

MACRO-64 Assembler for OpenVMS AXP (MACRO-64) is the assembly language

for AXP systems that provides precise control over instructions and data.

MACRO-64 supports a rich macro processing language that includes the following

features:

• Macro deﬁnition and expansion

• Symbolic labels, assembly-time variables, relocatable expression processing,

and 64-bit absolute expression processing

• Lexical string symbols and lexical operators

• Conditional assembly

• Implicit base register support

• Optional automatic data alignment

• Optional code optimizations

Included with MACRO-64 are a number of library macros that enable you to

write MACRO-64 programs that conform with the OpenVMS calling standard.

7.13 OPS5

DEC OPS5 is a preferred tool for developing high-performance, commercial

quality rule-based systems. Such systems are well suited to solve problems in the

following areas:

• Conﬁguration

• Selection

• Diagnosis

• Process monitoring and control

• Scheduling

7–8